CN116006119A - High-pressure brine layer well cementation reverse grouting column cement slurry system and preparation method thereof - Google Patents
High-pressure brine layer well cementation reverse grouting column cement slurry system and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-pressure brine layer well cementation slurry pouring column cement slurry system and a preparation method thereof, wherein the slurry pouring column cement slurry system consists of collar slurry and tail slurry; collar paste with density of 2.2g/cm 3 ～2.45g/cm 3 A cement slurry system within the range; the tail pulp has a density of 1.9g/cm 3 ～2.0g/cm 3 A cement slurry system within the range; the preparation method of the slurry system of the reverse slurry column comprises the steps of preparing the slurry system with the density of 2.2g/cm 3 ～2.45g/cm 3 The cement slurry system in the range is used as the collar slurry of the cement slurry system of the high-pressure brine layer well cementation reverse slurry column; preparation of a Density of 1.9g/cm 3 ～2.0g/cm 3 Cement paste systems within the scope. The cement paste system of the invention is mixed in situThe stirring is easy, and the sealing problem of the high-pressure brine layer can be well solved.
Description
Technical Field
The invention relates to the technical field of brine layer well cementation. In particular to a cement slurry system of a high-pressure saline water layer well cementation reverse grouting column and a preparation method thereof.
Background
High pressure salt-slurry cementing has been a worldwide technical problem due to the high water solubility, plasticity and hypersalinity of salt rock, and the salts and metal ions such as Ca in the salt slurry and salt water layers during cementing 2+ 、Mg 2+ And the cement slurry can be dissolved into the cement slurry, so that the cement slurry generates performance changes such as flash coagulation, coagulation acceleration, density rise, coagulation retardation or thick but non-coagulation, and the like, thereby bringing risks to well cementation construction and affecting the well cementation quality.
After the high-pressure well is well cemented, annular air channeling occurs, so that interlayer channeling can be caused, the test and evaluation of an oil-gas layer can be directly influenced, the oil-gas layer is polluted, and the recovery ratio is reduced; the annular air channeling also can have adverse effects on subsequent operations of oilfield development such as water flooding, acid fracturing, and zone mining. In addition, the service life of the oil and gas well is greatly shortened due to the occurrence of the annular gas channeling problem, and oil and gas can be blown out at a well mouth when the annular gas channeling problem is serious, so that well blowout accidents after well cementation are even caused; once a blowout accident occurs, it is difficult to work even with remedial processes such as cement extrusion. Therefore, the annular gas channeling after well cementation is prevented, and the method is not only the requirement of well cementation quality work, but also the necessary condition for accurately evaluating exploration and development results, protecting hydrocarbon reservoir and improving recovery ratio. The annular space is well sealed, the aim of layered exploitation can be achieved, and environmental pollution and unnecessary resource waste are avoided.
Aiming at high-pressure well cementation, a high-density cement slurry system is adopted to balance formation pressure, the high-density cement slurry is mostly weighted by weighting materials such as barite, iron ore powder and the like, and the weighting materials are inert materials and cannot participate in hydration, so that cement slurry is slow in development of cement stone strength in the waiting and setting process, annular channeling is caused when the cement stone strength is severe, and interval packing is invalid.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a high-pressure brine layer well cementation reverse grouting column cement slurry system and a preparation method thereof, so as to solve the problem of effective layer packing of a high-pressure brine well.
In order to solve the technical problems, the invention provides the following technical scheme:
a cement slurry system of a high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.2g/cm 3 ～2.45g/cm 3 A cement slurry system within the range; the tail pulp has a density of 1.9g/cm 3 ～2.0g/cm 3 Cement paste systems within the scope.
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column comprises the following components in parts by weight: 40 to 55 weight portions of water, 100 weight portions of cement, 40 to 110 weight portions of weighting agent, 2 to 4 weight portions of fluid loss agent, 2 to 5 weight portions of filler, 2 to 4 weight portions of expanding agent, 0.5 to 1.0 weight portions of dispersing agent, 0.1 to 1.0 weight portions of multifunctional auxiliary agent, 5 to 10 weight portions of salt and 0.3 to 0.5 weight portion of defoaming agent;
if the addition amount of the fluid loss agent in the collar slurry is less than 2 parts by weight, the water loss control cannot meet the requirement, and if the addition amount of the fluid loss agent is more than 4 parts by weight, the consistency of the cement slurry is increased, the pumping is not facilitated, and meanwhile, the cost is increased; the filler has here two roles: on one hand, according to the close packing theory, the filling agent and other components are subjected to particle grading so as to improve the compactness of the formed cement stone; on the other hand, the filler has a suspension stabilizing effect, and can reduce sedimentation of the weighting material in a high-density system. Because Portland cement has the characteristic of natural shrinkage, the addition of the expanding agent can resist the shrinkage of the cement, otherwise, once the cement is shrunk, a micro-gap is generated, so that the cement sealing is invalid. The multifunctional auxiliary agent has a suspension stabilizing effect, and because a large amount of weighting materials are added into the high-density cement slurry system, sedimentation is easy to occur if the suspension stability is poor, and the comprehensive performance of the cement slurry is affected; in addition, the multifunctional auxiliary agent also has an anti-channeling effect. In high-pressure brine layer well cementation, the chloride ion content in the stratum is very high, when the cement slurry reaches the stratum with very high chloride ion content, ion exchange easily occurs, so that the cement slurry performance is changed greatly, and serious safety accidents can be caused, so that the salt is required to be added, the chloride ion content in the cement slurry is equivalent to the chloride ion content in the stratum, and the ion exchange between the cement slurry and the stratum is effectively avoided. In addition, when the salt content is less than 10wt%, there is coagulation acceleration, and when the salt content is 10wt% -15 wt%, there is coagulation acceleration, and when the salt content is more than 15wt%, there is coagulation acceleration.
The tail slurry consists of the following components in parts by weight: 40-55 parts by weight of water, 100 parts by weight of cement, 2-4 parts by weight of a fluid loss agent, 2-4 parts by weight of a filler, 2-4 parts by weight of an expanding agent, 5-10 parts by weight of salt and 0.2-0.5 part by weight of a defoaming agent.
According to the cement slurry system of the high-pressure brine layer well cementation reverse grouting column, the cement selects G-level cement according to the API 10A standard; the fluid loss additive is AMPS ternary polymerization fluid loss additive; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide (the calcium aluminum oxide is aluminum powder coated with an aluminum oxide corrosion inhibition layer, and one or two or more of active magnesium oxide or calcium oxide are mixed); defoaming agent polyether defoamer; the salt is sodium chloride and/or potassium chloride.
The cement slurry system for the high-pressure brine layer well cementation reverse grouting column comprises the following components in parts by weight: 46-56 parts of calcium silicate, 2-8 parts of tricalcium aluminate, 8-24 parts of tetra-calcium aluminoferrite, 2-6 parts of magnesium oxide and 1-3 parts of sulfur trioxide.
The preparation method of the AMPS ternary polymerization fluid loss agent of the high-pressure brine layer well cementation reverse grouting column cement slurry system comprises the following steps:
step (1-1), adding a terpolymer monomer into distilled water, and stirring to obtain a dispersion liquid A;
step (1-2), dropwise adding sodium hydroxide solution into the dispersion liquid A to adjust the pH of the dispersion liquid A, and obtaining a dispersion liquid B after adjusting the pH;
transferring the dispersion liquid B into a four-neck flask for heating, adding ammonium persulfate solution to initiate polymerization reaction when the temperature of the dispersion liquid B is raised to the polymerization reaction temperature, and naturally cooling to room temperature after the reaction is finished to obtain the AMPS ternary polymerization filtrate reducer. There are many types of fluid loss agents commercially available and suitable for different well conditions. The fluid loss agent prepared by the method of the invention by adopting the aqueous solution free radical polymerization has good salt resistance effect, strong stability and strong ability of controlling the water loss, and is suitable for a salt-resistant cement slurry system.
In the step (1-1), a terpolymer monomer is formed by mixing 35-45 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 25-35 parts by weight of acrylamide and 15-25 parts by weight of acrylic acid; the mass concentration of the terpolymer monomer in the dispersion liquid A is 240g/L;
in the step (1-2), the mass concentration of sodium hydroxide in the sodium hydroxide solution is 20g/L; the pH of the dispersion liquid B is 6-9;
in the step (1-3), the mass fraction of the ammonium persulfate in the ammonium persulfate solution is 20wt%, and the addition amount of the ammonium persulfate solution is based on the mass of the ammonium persulfate which is 0.5-1% of the mass of the terpolymer monomer in the step (1-1); the polymerization temperature is 60-80 ℃; the reaction time is 4 to 6 hours.
The multifunctional auxiliary agent is a polymer sedimentation stabilizer, and is commercially available under the trade name of multipurpose cement additive and BJUltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer (including USZ, SAF, DRS, etc.); the weighting agent consists of iron ore powder A and iron ore powder B, and the densities of the iron ore powder A and the iron ore powder B are 5.0-5.1 g/cm 3 Within the range; the average grain diameter of the iron ore powder A is 130-160 mu m, the average grain diameter of the iron ore powder B is 20-30 mu m, the mass ratio of the iron ore powder A to the iron ore powder B is 4:1-3:1, and when the mass ratio of the iron ore powder A to the iron ore powder B is in the range, the grain grading effect of the slurry is good, the solid phase content in unit volume is high, and the weighting effect is good.
The density of the iron ore powder A and the iron ore powder B of the cement slurry system of the high-pressure brine layer well cementation reverse slurry column is 5.05g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The average grain diameter of the iron ore powder A is 150 mu m, and the average grain diameter of the iron ore powder B is 25 mu m; the mass ratio of the iron ore powder A to the iron ore powder B is 4:1. If it isThe iron ore powder A and/or the iron ore powder B have overlarge particle size, so that the iron ore powder A and/or the iron ore powder B are easy to settle in the slurry to influence the stability of the collar slurry, but have large specific surface area and are not easy to prepare the slurry if the particle size of the iron ore powder A and/or the iron ore powder B is too small.
Preparation method of high-pressure brine layer well cementation reverse grouting column cement slurry system with density of 2.2g/cm 3 ～2.45g/cm 3 The cement slurry system in the range is used as the collar slurry of the cement slurry system of the high-pressure brine layer well cementation reverse slurry column; preparation of a Density of 1.9g/cm 3 ～2.0g/cm 3 The cement slurry system in the range is used as the tail slurry of the cement slurry system of the high-pressure brine layer well cementation reverse slurry column.
The preparation method of the cement slurry system of the high-pressure brine layer well cementation reverse grouting column comprises the following steps:
step (2-1) is prepared by the following raw materials: 100 parts by weight of cement, 40-110 parts by weight of weighting agent, 2-4 parts by weight of fluid loss agent, 2-5 parts by weight of filler, 2-4 parts by weight of expanding agent, 0.5-1.0 part by weight of dispersing agent and 0.1-1.0 part by weight of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 40-55 parts by weight of water into a stirring cup of a constant-speed stirrer, and adding 5-10 parts by weight of salt and 0.3-0.5 part by weight of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; stirring at 12000rpm for 35 seconds to obtain collar slurry;
the preparation method of the tail slurry comprises the following steps:
step (3-1) preparing raw materials according to the following parts by weight: 100 parts by weight of cement, 2-4 parts by weight of a fluid loss agent, 2-4 parts by weight of a filler and 2-4 parts by weight of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3) adding 40-55 parts by weight of water into a stirring cup of a constant-speed stirrer, and adding 5-10 parts by weight of salt and 0.2-0.5 part by weight of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring for 35 seconds at 12000rpm to obtain tail pulp.
The technical scheme of the invention has the following beneficial technical effects:
the invention adopts the self-made precipitation agent to prepare the high-density cement slurry which is easy to mix on site by carrying out particle grading on the weighting agent, and the formed cement stone has high strength and low permeability. By using the cement slurry system of the high-pressure brine layer well cementation reverse grouting column, the double-coagulation system formed by the synergistic cooperation of the high-density collar slurry and the conventional density collar slurry can provide enough static liquid column pressure to stabilize the stratum, and has the advantages of short initial final setting time, quick strength development, high final strength, capability of sealing the key layer well and difficult annular cross flow. The cement slurry system provided by the invention is easy to mix and stir on site, and can well solve the sealing problem of a high-pressure saline water layer.
When the method is used for preparing the cement slurry system of the high-pressure saline water layer well cementation reverse grouting column, the slurry mixing time is short during the preparation of the collar slurry and the tail slurry, and the continuous pumping can be realized by adopting a four-machine Seattle double-machine pump truck. The high-density collar paste prepared by the invention is 2.2g/cm 3 ～2.45g/cm 3 The dynamic cutting force/initial cutting/final cutting of the die is lower than 1.9g/cm 3 ～2.0g/cm 3 The density tail slurry can effectively avoid instability in the slurry replacement process after the cement injection is finished and serious slurry mixing of the slurry leading tail slurry, thereby ensuring the overall performance of the cement slurry; and the high-density collar paste is 2.2g/cm 3 ～2.45g/cm 3 The thickening times of (a) are all higher than 1.9g/cm 3 ～2.0g/cm 3 The thickening time of the density tail slurry is more than 2 hours; in the well cementation industry, the shorter the thickening time of the tail slurry is, the faster the setting time is, and the gelation weight loss phenomenon can be generated in the process of converting the tail slurry from liquid state to solid state, so that the pressure of a generated hydrostatic column is gradually reduced to that of water, and the slurry is not formed into a gelation structure at the moment, thereby fully ensuring the weatherAnd sufficient hydrostatic column pressure is provided during the coagulation period, so that effective pressure stability is ensured, and interval packing can be realized until the tail slurry is coagulated to form strength, thereby improving the well cementation quality.
The collar slurry and the tail slurry prepared by the method form a double-coagulation system, and the collar slurry and the tail slurry are matched to form a reverse slurry column structure, so that the formation requirement of a high-pressure salt paste layer can be completely met, the high-pressure salt paste layer has high salt resistance, the water loss is within 50mL, and the free liquid is 0mL, so that the finally formed cement stone is not shrunk and has a micro-expansion effect. If the cement paste with high density is used, even if a double-set system is used, the salt paste layer section is activated at the lower part, and the well cementation quality is still unsatisfactory; the invention meets the needs of interval sealing of well cementation layers, utilizes low-density (namely conventional density) tail slurry to have short setting time, rapid strength development and good sealing effect on salt paste layers, is matched with high-density collar slurry to be used, ensures effective pressure stability during the period of the collar slurry hardening, effectively solves the problem of poor sealing of salt paste layer sections by utilizing a reverse slurry column double-hardening system, and achieves good application effect.
Drawings
FIG. 1 is a schematic drawing showing the static gelation profile of a collar slurry prepared in example 2 of the present invention;
FIG. 2 is a schematic diagram of evaluation of the quality of well cementation CBL-VDL-RBT in example 2 of the invention.
Detailed Description
Example 1
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.2g/cm 3 Is a cement paste system; the tail pulp has a density of 1.9g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.2g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 50kg of weighting agent, 2.5kg of fluid loss agent, 5kg of filler, 3kg of expanding agent, 0.8kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 47kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.2g/cm 3 Collar slurry;
density of 1.9g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 48kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.2kg of defoaming agent; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 1.9g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement [ in other examples, the cement is composed of the following components in parts by weight: 46-56 parts by weight of calcium silicate, 2-8 parts by weight of tricalcium aluminate, 8-24 parts by weight of tetracalcium aluminoferrite, 2-6 parts by weight of magnesium oxide and 1-3 parts by weight of sulfur trioxide; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide-aluminum powder with an aluminum oxide corrosion inhibition layer; the salt is sodium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available under the trade name multipurpose cement additive and BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent consists of iron ore powder A and iron ore powder B; the densities of the iron ore powder A and the iron ore powder B are 5.05g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The average grain diameter of the iron ore powder A is 150 mu m, and the average grain diameter of the iron ore powder B is 25 mu m; iron oreThe mass ratio of the powder A to the iron ore powder B is 4:1; the fluid loss agent in the tail slurry is a commercial AMPS ternary polymerization fluid loss agent; the fluid loss additive in the collar slurry is a self-made AMPS ternary polymerization fluid loss additive, and the preparation method of the AMPS ternary polymerization fluid loss additive comprises the following steps:
step (1-1), adding a terpolymer monomer into distilled water, and stirring to obtain a dispersion liquid A; the terpolymer monomer is formed by mixing 45 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 35 parts by weight of acrylamide and 25 parts by weight of acrylic acid; the mass concentration of the terpolymer monomer in the dispersion liquid A is 240g/L;
step (1-2), dropwise adding sodium hydroxide solution into the dispersion liquid A to adjust the pH of the dispersion liquid A, and obtaining a dispersion liquid B after adjusting the pH; the mass concentration of sodium hydroxide in the sodium hydroxide solution is 20g/L; the pH of dispersion B was 8;
transferring the dispersion liquid B into a four-neck flask for heating, and adding an ammonium persulfate solution to initiate polymerization when the temperature of the dispersion liquid B is increased to the polymerization temperature, wherein the mass fraction of the ammonium persulfate in the ammonium persulfate solution is 20wt%, and the addition amount of the ammonium persulfate solution is such that the mass of the ammonium persulfate is 1% of the mass of the terpolymer monomer in the step (1-1) as a standard; the polymerization temperature is 80 ℃; the reaction time was 5 hours; and naturally cooling to room temperature after the reaction is finished, thus obtaining the AMPS ternary polymerization fluid loss agent.
Example 2
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.25g/cm 3 Is a cement paste system; the tail pulp has a density of 1.95g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.25g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 60kg of weighting agent, 2.5kg of fluid loss agent, 5kg of filler, 3kg of expanding agent, 0.8kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 47kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.25g/cm 3 Collar slurry;
density of 1.95g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 45kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 1.95g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide-active magnesium oxide; the salt is sodium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available under the trade name multipurpose cement additive and BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent consists of iron ore powder A and iron ore powder B; the densities of the iron ore powder A and the iron ore powder B are 5.05g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The average grain diameter of the iron ore powder A is 150 mu m, and the average grain diameter of the iron ore powder B is 25 mu m; the mass ratio of the iron ore powder A to the iron ore powder B is 3:1; the fluid loss agents in the collar slurry and the tail slurry are self-made AMPS ternary polymerization fluid loss agents; the preparation method is the same as in example 1.
Example 3
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.3g/cm 3 Is a cement paste system; the tail pulp has a density of 2.0g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.3g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 75kg of weighting agent, 3kg of fluid loss agent, 5kg of filler, 3kg of expanding agent, 1.0kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 50kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.3g/cm 3 Collar slurry;
density of 2.0g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 42kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 1.95g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement; the fluid loss additives are self-made AMPS ternary polymerization fluid loss additives, and the preparation method is the same as that of the embodiment 1; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; expansion ofThe agent is calcium aluminum oxide-calcium oxide; the salt is sodium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available under the trade name multipurpose cement additive and BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent consists of iron ore powder A and iron ore powder B; the densities of the iron ore powder A and the iron ore powder B are 5.05g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The average grain diameter of the iron ore powder A is 150 mu m, and the average grain diameter of the iron ore powder B is 25 mu m; the mass ratio of the iron ore powder A to the iron ore powder B is 4:1.
Example 4
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.35g/cm 3 Is a cement paste system; the tail pulp has a density of 1.9g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.35g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 90kg of weighting agent, 3kg of fluid loss agent, 5kg of filler, 2kg of expanding agent, 1.0kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 52kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.35g/cm 3 Collar slurry;
density of 1.9g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 48kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.2kg of defoaming agent; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 1.9g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement; the fluid loss additives are commercial AMPS ternary polymerization fluid loss additives; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide-active magnesium oxide; the salt is potassium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available under the trade name multipurpose cement additive and BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent is iron ore powder with average grain diameter of 120 mu m, and the density of the iron ore powder is 5.05g/cm 3 。
Example 5
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.4g/cm 3 Is a cement paste system; the tail pulp has a density of 2.0g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.4g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 100kg of weighting agent, 3kg of fluid loss agent, 5kg of filler, 2kg of expanding agent, 1.0kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 50kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; the dry ash mixture A was then poured evenly into rotation at 4000rpm for 15 secondsIs arranged in the stirring cup; then stirring at 12000rpm for 35 seconds to obtain a density of 2.4g/cm 3 Collar slurry;
density of 1.95g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 45kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.0g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement; the liquid loss reducer of the collar slurry is a commercial AMPS ternary polymerization liquid loss reducer, the liquid loss reducer of the tail slurry is a self-made AMPS ternary polymerization liquid loss reducer, and the preparation method is the same as that of the example 1; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide; the salt is potassium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available under the trade name multipurpose cement additive and BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent consists of iron ore powder A and iron ore powder B; the densities of the iron ore powder A and the iron ore powder B are 5.05g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The average grain diameter of the iron ore powder A is 150 mu m, and the average grain diameter of the iron ore powder B is 25 mu m; the mass ratio of the iron ore powder A to the iron ore powder B is 4:1.
Example 6
The cement slurry system of the high-pressure brine layer well cementation reverse grouting column consists of collar slurry and tail slurry; collar paste with density of 2.45g/cm 3 Is a cement paste system; the tail pulp has a density of 2.0g/cm 3 Cement paste systems within the scope.
Wherein the density is 2.45g/cm 3 The preparation method of the collar paste comprises the following steps:
step (2-1) preparing raw materials: 100kg of cement, 110kg of weighting agent, 2kg of fluid loss agent, 5kg of filler, 2kg of expanding agent, 1.0kg of dispersing agent and 1.0kg of multifunctional auxiliary agent;
step (2-2), uniformly mixing the raw materials prepared in the step (2-1) under the normal temperature condition to obtain a dry ash mixture A;
step (2-3) adding 50kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture A into a rotating stirring cup within 15 seconds at the rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.45g/cm 3 Collar slurry;
density of 2.0g/cm 3 The preparation method of the tail stock comprises the following steps:
step (3-1) preparing raw materials: 100kg of cement, 2kg of a fluid loss agent, 3kg of a filler and 3kg of an expanding agent;
step (3-2), uniformly mixing the raw materials prepared in the step (3-1) under the normal temperature condition to obtain a dry ash mixture B;
step (3-3), adding 42kg of water into a stirring cup of a constant-speed stirrer, and adding 5kg of salt and 0.3kg of defoamer; starting a constant-speed stirrer, and stirring at 1500rpm for 3min to completely dissolve the salt; then evenly pouring the dry ash mixture B into a rotating stirring cup within 15 seconds at a rotating speed of 4000 rpm; then stirring at 12000rpm for 35 seconds to obtain a density of 2.0g/cm 3 Is added to the slurry.
In this example, the cement is a commercial grade G cement; the liquid loss reducer of the collar slurry is a commercial AMPS ternary polymerization liquid loss reducer, the liquid loss reducer of the tail slurry is a self-made AMPS ternary polymerization liquid loss reducer, and the preparation method is the same as that of the example 1; the filler is micro silicon powder with the grain diameter of 0.1-0.5 mu m; the expanding agent is calcium aluminum oxide; the salt is sodium chloride; defoaming agent polyether defoamer; the multifunctional auxiliary agent is a polymer sedimentation stabilizer, and in the embodiment, the multifunctional auxiliary agent is commercially available and has the trade name of multipurpose cement additive，BJ UltraMax TM L, the manufacturer is Bekkes; the dispersing agent is aldehyde ketone polymer SAF (sulfonated acetonide condensate); the weighting agent is iron ore powder with average grain diameter of 60 mu m, and the density of the iron ore powder is 5.05g/cm 3 。
When the collar slurry and the tail slurry are prepared in the examples 1 to 6, the slurry mixing time is short, and continuous pumping can be realized by adopting a four-machine Seattle double-machine pump truck. High density collar paste 2.2g/cm 3 ～2.45g/cm 3 The dynamic cutting force/initial cutting/final cutting of (2) is lower than 1.9g/cm 3 ～2.0g/cm 3 Density tail pulp; high density collar paste 2.2g/cm 3 ～2.45g/cm 3 The thickening times of (a) are all higher than 1.9g/cm 3 ～2.0g/cm 3 The thickening time of the density tail stock is more than 2 hours, and the thickening time difference of the density tail stock and the density tail stock is more than 2 hours. The slurry collar and the slurry tail prepared by the methods of the examples 1 to 6 can form a slurry pouring column structure when being used together, can completely meet the stratum requirement of a high-pressure salt paste layer, has high salt resistance, and has water loss within 50mL, and the free liquid is 0mL, so that the finally formed cement stone is not shrunk and has a micro-expansion effect. The results of the overall performance test of the collar pulps and tail pulps prepared in examples 1 to 6 are shown in Table 1.
TABLE 1
Applying the high-pressure brine layer well cementation reverse grouting column cement slurry system prepared in the examples 1 to 6 to an Irak BD block for engineering test; the well depth of the test is 4500-5050 m, and the bottom hole temperature is 110-125 ℃. The results of the application test are shown in table 2.
TABLE 2
FIG. 1 is a static gelation graph of the collar slurry prepared in example 2, and it can be seen from FIG. 1 that the designed cement slurry has short transition time, rapid strength development and good channeling-preventing performance;
fig. 2 shows that the quality evaluation CBL-VDL-RBT of the high-pressure brine layer well cementation reverse grouting column cement slurry system prepared in the embodiment 2 is 100% qualified in well cementation quality, and the high-quality rate is more than 90%, so that the method has very good economic benefit and application prospect.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (10)
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