CN111218266A - Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof - Google Patents
Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof Download PDFInfo
- Publication number
- CN111218266A CN111218266A CN202010142133.8A CN202010142133A CN111218266A CN 111218266 A CN111218266 A CN 111218266A CN 202010142133 A CN202010142133 A CN 202010142133A CN 111218266 A CN111218266 A CN 111218266A
- Authority
- CN
- China
- Prior art keywords
- acid
- persulfate
- blocking remover
- surfactant
- composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a composite blocking remover for a polymer flooding reservoir and a preparation and application method thereof, wherein the composite blocking remover comprises microemulsion containing transition metal salt, persulfate and an organic complexing agent, the composite blocking remover can realize efficient and safe blocking removal on a polymer or composite blocking formed by the polymer in a low-temperature stratum, has low corrosivity and simple preparation process, does not need segmented blocking construction on site, has the characteristics of high efficiency, safety, simple use, convenient site construction and the like, and has very wide application prospect and economic benefit.
Description
Technical Field
The invention relates to the technical field of a blocking remover for a polymer flooding reservoir.
Background
At present, the polymer flooding oil recovery technology becomes a main technical measure for improving the recovery ratio of various domestic oil fields. With the large-scale application of the polymer flooding oil extraction technology, the partial polymer flooding oil reservoir has the problem of blockage in different degrees, which is mainly shown in the problems that the injection of a partial injection well is difficult, the liquid production amount of the oil well is abnormally reduced, and the like. When the polymer is used for oil extraction by polymer flooding, the polymer continuously migrates to the deep part of the stratum along with the injection of a polymer solution, so that the polymer not only can block a hypertonic channel and be retained in smaller pores or roar channels in the stratum, but also can wrap inorganic scale, clay particles, crude oil and the like, and the blocking condition of the stratum is aggravated. In practice, based on analysis of downhole returns, it has been found that the plugs of polymer flooding formations are not single polymers, but composite plugs composed of polymers, various inorganic scales and crude oil.
In order to increase the productivity of an oil well, it is necessary to unblock a polymer flooding reservoir. In the prior art, an acidification blocking removal method is generally adopted to restore the permeability of a reservoir in a near wellbore region. However, the acidification method can only remove the blockage caused by carbonate and inorganic scale, but can not remove the blockage caused by the compounding of organic matters and polymers, and the ideal blockage removal effect is difficult to achieve. For example, patent application document cn96118759.x discloses a composite blocking remover for an oil well, which uses micellar acid aqueous solution, and can remove various blockages of stratum, but can not remove the blockage of polymer-driven reservoir caused by polymer. Or for example, patent document CN104449620A discloses an oil-displacing micro-emulsion acid system for acidification and plug removal and a preparation method thereof, wherein the disclosed oil-displacing micro-emulsion acid system has good solubility for inorganic matters and organic matters, and has excellent oil-displacing performance, but can not degrade polymers in composite plugs.
Aiming at the defects of the acidification method, part of the prior art further develops a method for deblocking by using a strong oxidant. For example, patent document CN102250601A discloses a composite blocking remover for oil well and its application method, wherein chlorine dioxide with low concentration is used to remove the polymer blocking in the stratum. Or as in patent document CN102925128A, a chemical blocking remover for polymer injection wells in oil fields is disclosed, which uses peroxide as a main oxidizing agent and relies on active hydroxyl generated by the reaction of the main oxidizing agent and a slow-release acid to oxidize and degrade polymers. The blockage removing methods have high safety risk during site construction, are not easy to control the construction process, and have stronger corrosivity on a construction pipe column.
In addition, in the prior art, both an acidification method and a strong oxidation method are mainly applied to medium-high temperature strata, the degradation effect of the low-temperature strata is not ideal, and the blockage removal of the composite blockage is difficult to realize.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a composite blocking remover for polymer flooding reservoirs, which can achieve efficient and safe blocking removal of polymer or composite type blocking formed by polymer in low-temperature formations.
The second purpose of the invention is to provide a preparation method of the composite blocking remover.
The invention also aims to provide an application method of the composite blocking remover.
In order to achieve one of the above purposes, the invention firstly provides the following technical scheme:
a composite blocking remover for polymer flooding oil reservoir comprises microemulsion containing transition metal salt, persulfate and organic complexing agent.
The microemulsion in the scheme refers to an emulsion in which the diameter of dispersed liquid drops is 5nm-100nm, and in the technical field of the blocking remover, the microemulsion is usually obtained under the assistance of mixing of a surfactant, a cosurfactant, oil and water.
According to some embodiments of the invention, the microemulsion further comprises a complexing acid.
Wherein the compound acid refers to a composition obtained by compounding two or more different acids.
According to some embodiments of the invention, the complex acid comprises a weakly ionic acid and a strong inorganic acid.
According to some embodiments of the invention, the mass ratio of the weak ionic acid to the strong inorganic acid is 1:1 to 5, more preferably 1:2 to 4.
According to some embodiments of the invention, the weakly ionic acid is selected from one or more of carboxylic acids having 1 to 3 carbon atoms.
According to some embodiments of the invention, the weak ionic acid is preferably selected from one or more of formic acid, acetic acid and propionic acid.
According to some embodiments of the invention, the strong inorganic acid is selected from the group consisting of earth acids.
According to some embodiments of the invention, the mass ratio of hydrochloric acid to hydrofluoric acid in the earth acid is 1-5:1, preferably 2-4: 1.
According to some embodiments of the invention, the microemulsion further comprises a corrosion inhibitor.
Wherein the corrosion inhibitor refers to a compound or compound that can prevent or slow the corrosion of a material, and may also be referred to as a corrosion inhibitor.
According to some embodiments of the invention, the corrosion inhibitor is selected from quaternary ammonium salt corrosion inhibitors.
According to some embodiments of the invention, the quaternary ammonium salt based corrosion inhibitor comprises a quaternary ammonium salt and potassium iodide, wherein the quaternary ammonium salt is selected from one or more of a benzyl quinoline quaternary ammonium salt, a quinoline-N-benzyl quaternary ammonium chloride salt, an isoquinoline quaternary ammonium salt, and a quinoline-N-methyl quaternary ammonium chloride salt.
According to some embodiments of the invention, the mass ratio of the quaternary ammonium salt to the potassium iodide is 1:10 to 25.
According to some embodiments of the invention, the organic complexing agent is selected from organic acids and/or organic acid salts.
According to some embodiments of the invention, the organic complexing agent is selected from one or more of ethylenediamine disuccinic acid, sodium sulfosalicylate, disodium ethylenediamine tetraacetate, sodium citrate and diethyltriamine pentaacetic acid.
According to some embodiments of the invention, the transition metal salt is selected from transition metal halide salts and/or transition metal sulfate salts.
According to some embodiments of the invention, the transition metal salt is selected from one or more of cobalt chloride, ferrous sulfate, ferric sulfate, and cobalt sulfate.
According to some embodiments of the invention, the persulfate is selected from one or more of potassium, sodium or ammonium persulfate.
According to some embodiments of the invention, the persulfate salt is selected from one or more of oxone, sodium persulfate, ammonium persulfate and potassium persulfate.
According to some embodiments of the present invention, the surfactant of the microemulsion comprises a first surfactant selected from polyoxyethylene ethers and/or polyoxyethylene ether salts and a second surfactant selected from sulfonates.
According to some embodiments of the invention, the first surfactant is selected from sodium fatty alcohol-polyoxyethylene ether sulfate and/or octylphenol-polyoxyethylene ether.
According to some embodiments of the invention, the second surfactant is selected from one or more of sodium petroleum sulfonate, sodium hexadecyl sulfonate, sodium dodecyl benzene sulfonate.
According to some embodiments of the invention, the mass ratio of the first surfactant to the second surfactant is 1-5:4, preferably 1-2: 4.
According to some embodiments of the invention, the co-surfactant of the microemulsion is selected from alcohols.
According to some embodiments of the invention, the alcohol is selected from one or more of n-propanol, isopropanol, n-butanol, n-pentanol, n-hexanol and n-octanol.
According to some embodiments of the invention, the oil of the microemulsion is selected from diesel.
According to some embodiments of the invention, the diesel is selected from one or more of 20#, 10#, 5#, 0#, -5# and-10 # diesel.
According to some embodiments of the invention, the microemulsion contains 1 to 10 wt%, preferably 3 to 8 wt% of any one of the persulfates described above.
According to some embodiments of the invention, the microemulsion contains 0.1 to 1.0 wt%, preferably 0.3 to 0.8 wt% of any one of the transition metal salts described above.
According to some embodiments of the invention, the microemulsion contains 0.5 to 2 wt% of any of the organic complexing agents described above, preferably 1.0 to 1.6 wt%.
According to some embodiments of the invention, the microemulsion further comprises 10 to 30 wt% of any one of the complex acids described above, preferably 15 to 25 wt%.
According to some embodiments of the invention, the microemulsion further comprises 5 to 10 wt% of any one of the surfactants described above.
According to some embodiments of the invention, the microemulsion further comprises 1-5 wt% of any one of the above co-surfactants.
According to some embodiments of the invention, the microemulsion further comprises 15-20 wt% of any one of the oils described above.
According to some embodiments of the invention, the microemulsion further comprises 0.3 to 1.0 wt% of any of the corrosion inhibitors described above.
The inventors have unexpectedly discovered that the formation plugs are primarily hydrochloric acid solubles, polymers, water, oil, and partially insoluble, most of which are flooding polymers. The composite plug can block a seepage channel, so that the formation permeability is reduced, and the polymer flooding oil production effect is seriously influenced. The main reason for the formation of the composite plug is that clay minerals or particles in the stratum absorb polymers, and the polymers are wrapped on the surfaces of particles to enlarge the particle size, aggregate the particles and finally lose mobility in the pores of the stratum. As the reservoir is developed, the reservoir pressure changes, causing waxy asphaltenes dissolved in the crude oil to precipitate, encapsulating the formed polymer clusters and forming composite plugs.
The inventor unexpectedly finds that the transition metal salt in the composite blocking remover can release free radicals under the condition of low temperature after the synergistic action of the transition metal salt and persulfate, the released free radicals can promote polymer blocking or composite blocking objects to be efficiently dissolved and degraded, and meanwhile, an organic complexing agent in the blocking remover can play a role in protecting and promoting the chemical reaction process and effectively slow down the corrosion to a construction pipe column.
In some embodiments, the deblocking agent of the present invention is added with a built acid, which can further enhance the dissolution and degradation of different types of plugs in the emulsion after synergistic action with other components.
In some embodiments, the blocking remover of the present invention is added with a special corrosion inhibitor, a surfactant, a co-surfactant, oil, etc., which not only can improve the dissolution and degradation effects of the blocking remover of the present invention, but also can reduce the corrosion of the acid solution in the blocking remover to the oil pipe and the casing pipe, and significantly increase the penetration distance of the blocking remover to the stratum.
In order to achieve the second purpose of the invention, the invention provides the following technical scheme:
the preparation method of the composite blocking remover comprises the following steps:
(1) mixing the transition metal salt and the organic complexing agent in water, and adding the persulfate into the obtained mixed solution to obtain a precursor solution;
(2) and preparing the obtained preflush and other components into microemulsion.
According to some embodiments of the invention, the step (2) comprises: mixing the pre-solution, the complex acid, the surfactant and the oil, and adding the cosurfactant in the mixing process to obtain a middle solution; and adding the corrosion inhibitor to the intermediate solution to obtain the microemulsion.
Such a specific preparation process comprises:
a. weighing 0.5g of cobalt chloride and 1.5g of sodium citrate, adding 48g of water, stirring for 5-6 hours, adding 5g of sodium persulfate, and stirring for 10 min;
b. mixing 18g of complex acid, the salt solution obtained in the step a, 4g of sodium dodecyl benzene sulfonate, 1g of octyl phenol polyoxyethylene ether and 15g of 0# diesel oil, and dropwise adding n-octyl alcohol while stirring until the solution is clear;
c. finally, 0.5g of corrosion inhibitor is added into the solution and stirred for 0.5h to form the microemulsion, namely the composite blocking remover.
The selection and the proportion of different components in the preparation method or the specific implementation mode thereof can refer to the technical scheme of the composite blocking remover.
In order to achieve the third purpose of the invention, the invention provides the following technical scheme:
the composite blocking remover or the composite blocking remover prepared by the preparation method is applied to the blocking removal of the polymer flooding reservoir.
The polymer may be, for example, a partially hydrolyzed polyacrylamide-based polymer, or the like.
According to some embodiments of the invention, the reservoir has a formation temperature of 20-60 ℃.
The invention has the following beneficial effects:
(1) the invention provides a novel polymer flooding oil reservoir blocking remover composition which is different from the prior art;
(2) the invention solves the problem that the composite blockage of each blocking remover in the prior art is difficult to be fully eliminated, namely the blockage formed after the combination of polymers, various inorganic scales, crude oil and the like;
(3) the blocking remover used in the prior art mainly aims at medium-high temperature strata, and has an unsatisfactory degradation effect in low-temperature strata, but the blocking remover can efficiently and fully realize blocking removal in low-temperature strata;
(4) compared with the prior art, the blocking remover disclosed by the invention is low in safety risk, easy to control the construction process and low in corrosivity on a construction pipe column;
(5) under the condition of 35 ℃, the dissolution rate of the blocking remover on composite plugs formed by organic matters, inorganic matters and polymers in a polymer flooding reservoir can reach more than 90 percent, and the corrosion rate on N80 steel sheets is less than 5 g/(m)2H), high-efficiency blockage removal and low corrosion can be simultaneously realized.
(6) The preparation method has simple process, does not need to carry out section plug construction on site, and has the characteristics of high efficiency, safety, simple use, convenient site construction and the like.
Detailed Description
The present invention is described in detail with reference to the following examples, but it should be understood that the examples are only for illustrative purposes and are not intended to limit the scope of the present invention. All reasonable variations and combinations that fall within the spirit of the invention are intended to be within the scope of the invention.
The following examples prepare the composite blocking remover by the following preparation process:
a. weighing transition metal salt and organic complexing agent, adding water, stirring for 5-6 hours, adding the weighed persulfate, and stirring for about 10 min;
b. b, mixing a certain amount of prepared compound acid with the solution obtained in the step a, the first surfactant, the second surfactant and oil, and dropwise adding the cosurfactant while stirring until the solution is clear;
c. adding a certain amount of corrosion inhibitor into the clarified solution, and stirring for about 0.5h to form microemulsion, namely the composite blocking remover.
Wherein the complex acid is formed by combining the earth acid and the weak ion acid according to the mass ratio of 2-4: 1.
The mass ratio of the hydrochloric acid to the hydrofluoric acid in the alkaline earth acid is 2-4:1, and the weak ion acid is one or more of formic acid, acetic acid and propionic acid.
The dissolution test of the blocking remover prepared in the following examples comprises the following specific steps: weighing about 10g of composite plug sample, adding the obtained blocking remover, then placing the blocking remover in a constant-temperature water bath at 35 ℃ for constant temperature 48h, taking out the sample, absorbing surface water by using filter paper, weighing, and calculating the dissolution rate according to the mass change of the plug before and after treatment.
Wherein the composite plug samples were practically generated with compositional analysis as shown in table 1:
TABLE 1 composition of formation plugs Table
| Name of ingredient | Crude oil | Polymer and method of making same | Hydrochloric acid soluble substance | Hydrochloric acid insoluble substance |
| Content/% | 18.3 | 48.6 | 25.9 | 7.2 |
。
The corrosion evaluation test of the blocking remover prepared in the following examples is carried out according to the standard of SY-T5405-1996 performance test method and evaluation index of corrosion inhibitor for acidification, and specifically, the corrosion evaluation of N80 steel sheets is carried out for 4 hours by the obtained blocking remover under the condition of 35 ℃.
Example 1
Preparing 100g of composite blocking remover, which comprises the following components: 5% of ammonium persulfate, 0.3% of ferrous chloride, 1.5% of ethylene diamine tetraacetic acid disodium, 18% of compound acid, 4% of petroleum sodium sulfonate, 1% of octyl phenol polyoxyethylene ether, 20% of 10# diesel oil, 0.6% of quinoline-N-benzyl quaternary ammonium chloride salt, 2% of N-amyl alcohol and the balance of water.
Example 2
Preparing 100g of composite blocking remover, which comprises the following components: 8% of sodium persulfate, 0.3% of ferrous chloride, 1.0% of diethyl triaminepentaacetic acid, 15% of compound acid, 4% of sodium hexadecylsulfonate, 1% of octyl phenol polyoxyethylene ether, 15% of 5# diesel oil, 0.5% of quinoline-N-benzyl quaternary ammonium chloride salt, 1% of N-propanol and the balance of water.
Example 3
Preparing 100g of composite blocking remover, which comprises the following components: 10% of sodium persulfate, 0.5% of ferrous sulfate, 1.0% of sodium citrate, 15% of compound acid, 6% of sodium hexadecylsulfonate, 1.5% of octyl phenol polyoxyethylene ether, 15% of 0# diesel oil, 0.5% of quinoline-N-benzyl quaternary ammonium chloride salt, 2% of N-octanol and the balance of water.
Example 4
Preparing 100g of composite blocking remover, which comprises the following components: 8% of potassium persulfate, 0.3% of ferrous chloride, 1.4% of diethyl triaminepentaacetic acid, 19% of compound acid, 4% of petroleum sodium sulfonate, 1% of octyl phenol polyoxyethylene ether, 19% of 0# diesel oil, 0.6% of benzyl quinoline quaternary ammonium salt, 5% of n-amyl alcohol and the balance of water.
Example 5
Preparing 100g of composite blocking remover, which comprises the following components: 3% of ammonium persulfate, 0.5% of cobalt chloride, 1.0% -1.6% of ethylene diamine tetraacetic acid disodium salt, 16% of complex acid, 6% of sodium dodecyl benzene sulfonate, 3% of octyl phenol polyoxyethylene ether, 16% of 10# diesel oil, 0.4% of quinoline-N-benzyl quaternary ammonium chloride salt, 3% of N-octanol and the balance of water.
Example 6
Preparing 100g of composite chemical blocking remover, which comprises the following components: 8% of sodium persulfate, 0.8% of ferrous chloride, 1.2% of diethyl triamine pentaacetic acid, 25% of compound acid, 8% of sodium hexadecyl sulfonate, 2% of octyl phenol polyoxyethylene ether, 15% of 10# diesel oil, 0.5% of quinoline-N-benzyl quaternary ammonium chloride salt, 5% of N-butyl alcohol and the balance of water.
Example 7
Preparing 100g of composite blocking remover, which comprises the following components: 10% of sodium persulfate, 0.5% of ferrous sulfate, 1.2% of diethyl triamine pentaacetic acid, 20% of compound acid, 6% of sodium dodecyl benzene sulfonate, 1.5% of octyl phenol polyoxyethylene ether, 18% of 5# diesel oil, 0.4% of benzyl quinoline quaternary ammonium salt, 3% of n-amyl alcohol and the balance of water.
Example 8
Preparing 100g of composite blocking remover, which comprises the following components: 7% of ammonium persulfate, 0.5% of cobalt sulfate, 1.0% of sodium sulfosalicylate, 15% of compound acid, 4% of sodium hexadecylsulfonate, 1% of octyl phenol polyoxyethylene ether, 15% of 5# diesel oil, 0.6% of quinoline-N-benzyl quaternary ammonium chloride salt, 3% of N-hexanol and the balance of water.
The results of dissolution tests performed on the deblocking agents of examples 1 to 8 are shown in Table 2:
TABLE 2 dissolution results
| Sample (I) | Initial mass M1(g) | Mass M after 48h2(g) | Dissolution rate (%) |
| Example 1 | 10.35 | 0.75 | 92.8 |
| Example 2 | 10.31 | 0.56 | 94.6 |
| Example 3 | 10.28 | 0.26 | 97.5 |
| Example 4 | 10.48 | 0.31 | 97.0 |
| Example 5 | 10.41 | 0.49 | 95.3 |
| Example 6 | 10.29 | 0.32 | 96.9 |
| Example 7 | 10.62 | 0.59 | 94.4 |
| Example 8 | 10.37 | 0.25 | 97.5 |
From the above table, it can be seen that the composite blocking remover prepared in the above embodiments has a dissolution rate of more than 90% for the composite blocking object under low temperature conditions, and has good blocking removal effect.
The results of the corrosion evaluation tests of the blocking removers of examples 1 to 8 are shown in Table 3:
TABLE 3 Corrosion Rate results
As can be seen from the above table, the corrosion rate of the blocking remover of each example on the N80 steel sheet at low temperature is less than 5 g/(m)2H), the corrosion inhibitor meets the relevant standard of corrosion protection, can effectively prevent the blockage removal agent from corroding pipelines and equipment during operation, ensures the construction safety, and meets the requirement of an oil field on a well fluid.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (10)
1. A composite blocking remover for polymer flooding oil reservoirs comprises microemulsion containing transition metal salt, persulfate and an organic complexing agent; preferably, the microemulsion further comprises a complex acid and/or a corrosion inhibitor.
2. The composite blocking remover according to claim 1, wherein: the compound acid comprises weak ion acid and inorganic strong acid, and/or the corrosion inhibitor is selected from quaternary ammonium salt corrosion inhibitors;
preferably, the mass ratio of the weak ionic acid to the strong inorganic acid is 1:1-5, more preferably 1: 2-4;
preferably, the weak ionic acid is selected from one or more of carboxylic acids with 1-3 carbon atoms, and is further preferably selected from one or more of formic acid, acetic acid and propionic acid;
preferably, the inorganic strong acid is selected from the group consisting of an earth acid, and further preferably, the mass ratio of hydrochloric acid to hydrofluoric acid in the earth acid is 1-5:1, more preferably 2-4: 1;
preferably, the quaternary ammonium salt corrosion inhibitor comprises quaternary ammonium salt and potassium iodide, wherein the quaternary ammonium salt is selected from one or more of benzyl quinoline quaternary ammonium salt, quinoline-N-benzyl quaternary ammonium chloride salt, isoquinoline quaternary ammonium salt and quinoline-N-methyl quaternary ammonium chloride salt, and further preferably, the mass ratio of the quaternary ammonium salt to the potassium iodide is 1: 10-25.
3. The composite blocking remover according to claim 1 or 2, wherein: the organic complexing agent is selected from organic acid and/or organic acid salt; preferably, the organic complexing agent is selected from one or more of ethylenediamine disuccinic acid, sodium sulfosalicylate, disodium ethylenediamine tetraacetate, sodium citrate and diethyltriamine pentaacetic acid.
4. The composite blocking remover according to any one of claims 1-3, wherein: the transition metal salt is selected from transition metal halide salt and/or transition metal sulfate, preferably, the transition metal salt is selected from one or more of cobalt chloride, ferrous sulfate, ferric sulfate and cobalt sulfate.
5. The composite blocking remover according to any one of claims 1-4, wherein: the persulfate is selected from one or more of potassium persulfate, sodium persulfate and ammonium persulfate, and preferably, the persulfate is selected from one or more of potassium hydrogen persulfate, sodium persulfate, ammonium persulfate and potassium persulfate.
6. The composite blocking remover according to any one of claims 1-5, wherein: the surfactant of the microemulsion comprises a first surfactant and a second surfactant, wherein the first surfactant is selected from polyoxyethylene ether and/or polyoxyethylene ether salt, preferably fatty alcohol-polyoxyethylene ether sodium sulfate and/or octyl phenol-polyoxyethylene ether, the second surfactant is selected from sulfonate, preferably one or more of petroleum sodium sulfonate, sodium hexadecyl sulfonate and sodium dodecyl benzene sulfonate, preferably, the mass ratio of the first surfactant to the second surfactant is 1-5:4, and more preferably 1-2: 4; and/or the co-surfactant of the microemulsion is selected from alcohols, preferably from one or more of n-propanol, isopropanol, n-butanol, n-pentanol, n-hexanol and n-octanol; and/or the oil of the microemulsion is selected from diesel oil, preferably one or more of 20#, 10#, 5#, 0#, -5# and-10 # diesel oil.
7. The composite blocking remover according to any one of claims 1-6, wherein: said microemulsion contains from 1 to 10% by weight of said persulfate, preferably from 3 to 8%; and/or from 0.1 to 1.0% by weight, preferably from 0.3 to 0.8% by weight, of the transition metal salt; and/or from 0.5 to 2% by weight, preferably from 1.0 to 1.6% by weight, of the organic complexing agent.
8. The composite blocking remover according to claim 7, wherein: the microemulsion also contains 10-30 wt%, preferably 15-25 wt% of the complex acid; and/or further comprises 5-10 wt% of the surfactant; and/or further comprises 1-5 wt% of the cosurfactant; and/or further comprising 15-20 wt% of said oil; and/or further comprises 0.3-1.0 wt% of the corrosion inhibitor.
9. The method of preparing a composite deblocking agent according to any one of claims 1-8, comprising the steps of:
(1) mixing the transition metal salt and the organic complexing agent in water, and adding the persulfate into the obtained mixed solution to obtain a precursor solution;
(2) preparing the obtained precursor solution and other components into microemulsion;
preferably, the step (2) includes: mixing the pre-solution, the complex acid, the surfactant and the oil, and adding the cosurfactant in the mixing process to obtain a middle solution; and adding the corrosion inhibitor to the intermediate solution to obtain the microemulsion.
10. The use of the composite blocking remover according to claims 1-8 or the composite blocking remover prepared by the preparation method according to claim 9 in the blockage removal of polymer flooding reservoirs, preferably, the stratum temperature of the reservoirs is 20-60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010142133.8A CN111218266A (en) | 2020-03-04 | 2020-03-04 | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010142133.8A CN111218266A (en) | 2020-03-04 | 2020-03-04 | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111218266A true CN111218266A (en) | 2020-06-02 |
Family
ID=70811569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010142133.8A Pending CN111218266A (en) | 2020-03-04 | 2020-03-04 | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111218266A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080217011A1 (en) * | 2007-03-06 | 2008-09-11 | Halliburton Energy Services, Inc. | Methods for treating a subterranean formation with a treatment fluid containing a gelling agent and subsequently breaking the gel with an oxidizer |
| CN101691839A (en) * | 2009-09-30 | 2010-04-07 | 陕西中孚石油技术有限责任公司 | Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well |
| CN102925128A (en) * | 2012-11-05 | 2013-02-13 | 中国海洋石油总公司 | Compound chemical blocking removing agent of oil field polymer injection well |
| CN105462573A (en) * | 2014-09-09 | 2016-04-06 | 中国石油化工股份有限公司 | Blocking remover for augmented injection of oilfield polymer-injected wells |
| CN105985759A (en) * | 2015-02-11 | 2016-10-05 | 中国海洋石油总公司 | Composite blocking remover for oil well and preparation method thereof |
-
2020
- 2020-03-04 CN CN202010142133.8A patent/CN111218266A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080217011A1 (en) * | 2007-03-06 | 2008-09-11 | Halliburton Energy Services, Inc. | Methods for treating a subterranean formation with a treatment fluid containing a gelling agent and subsequently breaking the gel with an oxidizer |
| CN101691839A (en) * | 2009-09-30 | 2010-04-07 | 陕西中孚石油技术有限责任公司 | Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well |
| CN102925128A (en) * | 2012-11-05 | 2013-02-13 | 中国海洋石油总公司 | Compound chemical blocking removing agent of oil field polymer injection well |
| CN105462573A (en) * | 2014-09-09 | 2016-04-06 | 中国石油化工股份有限公司 | Blocking remover for augmented injection of oilfield polymer-injected wells |
| CN105985759A (en) * | 2015-02-11 | 2016-10-05 | 中国海洋石油总公司 | Composite blocking remover for oil well and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 江兴林等: "《油气助探与开发》", 3 August 2002, 东营：石油大学出版社 * |
| 邸伟娜等: "新型油田酸化用缓速酸的研制", 《精细石油化工进展》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111534290B (en) | Water-lock releasing agent for reservoir protection drilling fluid and preparation and use methods thereof | |
| CN103422840B (en) | Use the flooding method of anions and canons complexed surfactant | |
| CA1189303A (en) | Method for recovering oil from sub-terranean deposits | |
| US4487265A (en) | Acidizing a subterranean reservoir | |
| CN108102624B (en) | Neutral blockage removal treating agent and preparation method thereof | |
| CN102775974B (en) | Active mixed acid plugging removal solution applicable to low permeability reservoir | |
| CN109652043B (en) | Chemical blocking remover suitable for ternary combination flooding injection well | |
| CN112111258B (en) | Water-lock injury blocking remover, use method thereof and water-lock injury acidizing fluid | |
| CN103421478B (en) | A kind of preparation method of the composite blockage relieving extender for sandstone reservoir water injection well | |
| CN112143479B (en) | Non-flowback stamping acidification system for water injection well of low-permeability reservoir and preparation method | |
| CN107216865B (en) | Self-diverting acidizing fluid and preparation method and application thereof | |
| CN113061424A (en) | Solid blockage removal system for low-permeability oil reservoir oil-water well and preparation method thereof | |
| CN112708408B (en) | Depressurization injection increasing agent for ultra-low permeability oilfield injection well and preparation method and application thereof | |
| CN105542732B (en) | A kind of self-generated foam micellar acid solution of water injection well | |
| CN109294544B (en) | Non-oxidized polymer chemical blockage removal gel breaker and preparation method thereof | |
| CN117801800A (en) | An environmentally friendly autogenic acid fracturing fluid used to relieve and inhibit damage | |
| CN112724953B (en) | Nano pressure-reducing, injection-increasing, oil-displacing and viscosity-reducing integrated agent and preparation method and application thereof | |
| CN104449633B (en) | A kind of crude oil surfactant and its preparation method and application | |
| CN111218266A (en) | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof | |
| CN103694979B (en) | A kind of polyhydric acid composition and its application | |
| CN114196391A (en) | Acid liquor system for asphaltene reservoir and preparation method thereof | |
| CN119039960A (en) | Zero-fluorine super cleanup additive for oil field | |
| CN105505361A (en) | A kind of preparation method of self-generated foam micelle acid solution of water injection well | |
| CN115873573A (en) | A kind of acidification plugging removal liquid, preparation method and application | |
| CA1199783A (en) | Method for recovering oil from an underground deposit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200602 |
|
| RJ01 | Rejection of invention patent application after publication |