CN113930225B - Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof - Google Patents
Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 9
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- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 7
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 7
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- 241001453445 Acalypha rhomboidea Species 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 206010013883 Dwarfism Diseases 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
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- 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
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Abstract
The invention discloses a wax crystal dispersing agent for reviving high wax-containing condensate gas reservoirs, which comprises the following components in percentage by mass: 50-65% of organic solvent A, 12-18% of organic solvent B, 8-15% of penetrating agent, 4-10% of dispersing agent, 1-8% of synergist and 4-10% of mutual solvent. The wax crystal dispersing agent can quickly disperse and dissolve wax blocks, has the advantages of high low-temperature dispersing speed, irreversible dispersion along with temperature reduction, no color, no odor, environmental friendliness, no influence on the properties of crude oil in the block and the like, can effectively solve the problems of serious wax deposition, blockage of oil and gas channels and the like of a high-wax-content condensate gas reservoir shaft, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a wax crystal dispersing agent for a reviving high-wax-content condensate gas reservoir and a preparation method thereof.
Background
During the process of developing the wax-containing crude oil, the problem of exploitation caused by wax is very prominent. All wells show that oil gas is produced simultaneously in the process of exploiting the dwarfism continental shale oil and gas reservoir, crude oil contains wax in different degrees, the problems of serious wax deposition and blockage of a well bore and the like occur in the process of pilot production, normal production is influenced, and even a lying well is caused.
At present, a paraffin remover containing aromatic substances such as benzene and the like commonly used in an oil well mainly takes a dissolved wax sample as a main component, the dissolved wax sample flows out along with liquid in a shaft, but the melting point of the wax sample of a revival complex oil-gas reservoir is between 55 and 75 ℃, the wax precipitation point is between 33 and 48 ℃, the melting point is far higher than the wax precipitation point, and the paraffin remover has the characteristics of easy caking and difficult cleaning. Selecting a wax remover with a high wax dissolution rate by a 56# standard wax sample according to a wax remover optimization method in SY/T6300-plus 2009, wherein the wax dissolution rate at 45 ℃ for a revived wax sample is 0g/min, and the wax remover is completely insoluble and cannot meet the requirements of site construction; meanwhile, aromatic substances such as benzene and the like are usually required to be introduced, and the environmental protection requirement cannot be met. For example, patent CN1081215C discloses an oil well paraffin remover for oil fields, which is composed of alkane, aromatic hydrocarbon, alkyl halide and surfactant, and comprises the following components by mass percent: 30-55% of alkane, 30-60% of aromatic hydrocarbon (toluene, xylene or mixed benzene), 14.9-7% of alkyl halide (carbon tetrachloride and chloroform) and 0.1-3% of surfactant, and a large amount of aromatic hydrocarbon and alkyl halide which are harmful to human bodies and the environment are needed; patent CN102604625 discloses an efficient, low-toxicity and safe oil-based paraffin remover for an oil well, which consists of a benzene system 1, a benzene system 2, petroleum ether, a surfactant and a weighting agent, wherein the component ratio of each component is as follows: benzene series 1 (pure benzene, etc.) about 29%, benzene series 2 (xylene, etc.) about 19%, petroleum ether about 32%, surfactant about 0.1%, and weighting agent 20%; wherein a large amount of benzene-based solvent still needs to be introduced.
Therefore, the method further explores the efficient and environment-friendly wax crystal dispersant suitable for the renaturation high wax-containing condensate gas reservoir, and has important research and application significance.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects that a shaft is seriously waxed, blocks an oil-gas channel, influences normal production and the like in the process of exploiting the existing renaturation high-wax-content condensate gas reservoir, and provides a wax crystal dispersing agent capable of rapidly dispersing and dissolving wax blocks.
In order to achieve the purpose, the invention adopts the technical scheme that:
a wax crystal dispersing agent for reviving high wax-containing condensate gas reservoirs comprises the following components in percentage by mass:
in the scheme, the organic solvent A is an organic alkane solvent, and can be one or more of n-hexane, n-heptane, n-octane, n-nonane and the like.
In the scheme, the organic solvent B is lower alcohol I, and can be one or a mixture of n-butanol and isobutanol.
In the scheme, the penetrating agent is an ether nonionic surfactant, and polyoxyethylene ether nonionic surfactant can be selected; specifically, alkylphenol ethoxylates can be used.
In the scheme, the dispersing agent is an alkane nonionic surfactant, and an organic siloxane surfactant can be selected; specifically, polyether modified siloxane betaine surfactant and the like can be selected.
In the scheme, the synergist is organic ether, and ethylene glycol butyl ether and the like can be selected.
In the scheme, the mutual solvent is lower alcohol II, and ethanol or propanol and the like can be selected.
The preparation method of the wax crystal dispersing agent for the reviving high wax-containing condensate gas reservoir comprises the following steps:
1) weighing the raw materials according to the mixture ratio, wherein the raw materials and the mass percentage of the raw materials comprise: the organic solvent A50-65%, the organic solvent B12-18%, the penetrating agent 8-15%, the dispersing agent 4-10%, the synergist 1-8%, and the mutual solvent 4-10%;
2) taking the organic solvent A as mother liquor, adding the organic solvent B into the weighed mother liquor, and stirring in a reaction kettle for 15-30 min; then sequentially adding the penetrating agent and the dispersing agent, and respectively stirring until the penetrating agent and the dispersing agent are dissolved to form a uniform solution;
3) adding a synergist into the uniform solution obtained in the step 2), and stirring in a reaction kettle for 15-30min to form a uniform solution; and finally, adding the mutual solvent, and stirring in a reaction kettle for 15-30min to form a uniform solution, thereby obtaining the wax crystal dispersing agent.
The method is characterized in that a field wax sample (shaft wax sample) is made into a 1g size sphere according to the standard of SY/T6300-.
The principle of the invention is as follows:
an organic solvent A + B; the invention combines the organic alkane solvent and the lower alcohol solvent, can dissolve and disperse the normal alkane wax deposited on the tube wall, becomes a small particle suspension state and flows out along with the oil flow;
penetrant + extender; the penetrating agent and the expanding agent are used in a compounding way, so that powerful penetrating and dispersing effects can be exerted, the interfacial tension between wax crystals and between the wax crystals and the pipe wall is effectively reduced, the composite organic solvent is further accelerated to enter the wax crystals, the structure of the wax is damaged, and the wax dissolving rate is improved;
a synergist: the function and effect of the wax crystal dispersing agent are enhanced, and the dispersed wax crystals are further effectively prevented from being agglomerated again, and are dissolved in an organic solvent when the melting point of the wax crystals is higher than the melting point of a wax sample;
mutual solvent: aiming at the dissolution and enhancement mechanism, the invention further introduces a lower alcohol mutual solvent, can reduce the adsorption loss of the surfactant, reduce the surface interfacial tension of the system, effectively enhance the stability of the whole system, and further promote the mutual synergistic effect among all functional additives so as to well play the role of the whole system.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts a composite solvent formed by an organic alkane solvent and a lower alcohol solvent, and further introduces a penetrating agent, an expanding agent, a synergist and a mutual solvent, thereby showing a quick, efficient and stable dispersing effect on a wax sample;
2) the wax crystal dispersing agent has the advantages of high low-temperature dispersing speed, irreversible property along with temperature reduction after dispersion, no color, no smell, environmental friendliness, no influence on the property of crude oil in the block and the like, can effectively solve the problems of serious wax deposition, oil and gas channel blockage and the like of a high-wax-content condensate gas reservoir shaft, and has better application prospect;
3) the preparation method provided by the invention is simple, low in cost and suitable for popularization and application.
Drawings
FIG. 1 is a graph showing the dispersing effect of the wax crystal dispersant obtained by the invention on a shaft wax sample at 25 ℃ for different times.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the following examples, wellbore waxes were used as provided by the Fuxing Fuge 8-1HF wells.
The adopted dispersing agent is polyether modified siloxane betaine surfactant and is provided by Sichuan Xin Ailisi new material science and technology limited company.
Example 1
A wax crystal dispersing agent for reviving highly-waxy condensate gas reservoirs is prepared by the following steps:
respectively measuring 325ml of organic solvent (20 vol% n-hexane, 20 vol% n-heptane, 10 vol% n-octane and 50 vol% n-nonane) and pouring the organic solvent into a stirring container, adjusting the rotation speed of the stirrer until the top end of a central shaft of a stirrer blade can be seen by a vortex formed by liquid, adding 90ml of n-butanol into the mother solution, fully stirring for 15-30min until the solution is fully and uniformly dissolved, adding 40ml of alkylphenol polyoxyethylene and 20ml of polyether modified siloxane betaine surfactant into a reaction kettle at 40 ℃ and stirring until the solution is fully dissolved into a uniform solution, adding 5ml of ethylene glycol monobutyl ether into the reaction kettle at 60 ℃ and stirring for 15-30min, finally adding 20ml of ethanol, and fully stirring for 15-30mim until the solution is uniformly mixed to obtain the wax crystal dispersing agent.
The wax crystal dispersing agent is used as a low-temperature rapid wax crystal dispersing agent for a renaturation condensate gas reservoir shaft wax sample, the field wax sample is made into a spherical shape with the size of 1g according to the standard of SY/T6300-.
The dispersion of the wax crystal dispersant on the wellbore wax sample at different temperatures is shown in table 1.
TABLE 1 Dispersion Effect of wax crystal dispersants on wellbore wax samples under different temperature conditions
| Temperature, C | Mass of wax ball, g | Time, min | Status of state |
| 10 | 1.005 | 40 | Dispersing |
| 20 | 1.003 | 32 | Dispersing |
| 30 | 1.002 | 28 | Dispersing |
| 40 | 1.006 | 22 | Dispersing |
| 50 | 1.003 | 40 | Dispersing + dissolving |
As can be seen from Table 1, after the wax crystal dispersing agent obtained in the embodiment is reacted for 20-50min at normal temperature (10-25 ℃), agglomerated wax balls are dispersed into tiny particles, rapid dispersion can be realized in a short time, and dispersed microcrystals are not aggregated into blocks along with environmental changes; the dispersing agent can show a rapid, efficient and stable dispersing effect on a wax sample of a shaft.
Example 2
A wax crystal dispersant for reviving high wax-containing condensate gas reservoirs is prepared by the following steps:
respectively measuring 250ml of organic solvent (45 vol% n-hexane, 30 vol% n-heptane, 20 vol% n-octane and 5 vol% n-nonane) and pouring the organic solvent into a stirring container, adjusting the rotation speed of the stirrer until the top end of a central shaft of a stirrer blade can be seen by a vortex formed by liquid, adding 60ml of n-butanol into the mother liquor, fully stirring for 15-30min until the solution is fully and uniformly dissolved, adding 75ml of alkylphenol polyoxyethylene ether and 40ml of polyether modified siloxane betaine surfactant, stirring in a reaction kettle at 40 ℃ until the solution is fully and uniformly dissolved, then adding 35ml of ethylene glycol monobutyl ether, stirring in the reaction kettle at 60 ℃ for 15-30min, finally adding 40ml of ethanol, and fully stirring for 15-30 mm until the solution is uniformly mixed.
The wax crystal dispersing agent is used for a low-temperature rapid wax crystal dispersing agent of a renaturation condensate gas reservoir shaft wax sample, the field wax sample is made into a 1 g-size sphere according to the standard of SY/T6300-.
Example 3
A wax crystal dispersant for reviving high wax-containing condensate gas reservoirs is prepared by the following steps:
respectively measuring 300ml of organic solvent (30 vol% n-hexane, 25 vol% n-heptane, 30 vol% n-octane and 15 vol% n-nonane) and pouring the organic solvent into a stirring container, adjusting the rotation speed of the stirrer until the top end of a central shaft of a stirrer blade can be seen by a vortex formed by liquid, adding 75ml of n-butanol into the mother solution, fully stirring for 15-30min until the solution is fully and uniformly dissolved, adding 50ml of alkylphenol polyoxyethylene ether and 30ml of polyether modified siloxane betaine surfactant, stirring in a reaction kettle at 40 ℃ until the solution is fully dissolved into a uniform solution, adding 15ml of ethylene glycol monobutyl ether, stirring in the reaction kettle at 60 ℃ for 15-30min, finally adding 30ml of ethanol, and fully stirring for 15-30mim until the solution is uniformly mixed.
The wax crystal dispersing agent is used for a low-temperature rapid wax crystal dispersing agent of a renaturation condensate gas reservoir shaft wax sample, the field wax sample is made into a 1 g-size sphere according to the standard of SY/T6300-.
Application example
The near-term Fupagel 8-1HF well is shut down for a long time due to wax blockage, the blockage can not be removed by utilizing the processes of gas lift, coiled tubing paraffin removal and the like in the period, and the coiled tubing is connected with a pen point tool in the later period, and the part is blocked when the distance is less than 1390m and is lifted up to 1380 m.
The wax crystal dispersant obtained in example 2 was injected into the annular space between the coiled tubing and the oil pipe, and the total injection amount was 0.6m 3 And closing the well for 1 h. And (3) after the well is opened, a coiled tubing is put in at 15m/min, and the coiled tubing is continuously put in until 2800m after 1390m is successfully passed through, and the paraffin removal effect is obvious as shown by the field application effect.
Comparative example 1
A cleaning wax-removing agent does not contain organic chlorine and benzene, the freezing point of crude oil can be reduced to 0-3 ℃ from 14 ℃, and the wax-dissolving rate is 0.018 g/min. In the early stage of wax blockage of the well, a tool with a pen point is connected by a coiled tubing, and the well is lifted up to 10m to 590m when being blocked at the lower depth of 600 m. The paraffin remover is added into the coiled tubing 2m 3 And after the coiled tubing is soaked for 48 hours, the coiled tubing is put into the well at a speed of 15m/min after the well is opened, smoothly passes through a 600m resistance meeting point and then meets the resistance again at 650m, and the resistance can not be effectively removed.
Comparative example 2
Measuring 15ml of organic solvent (30 vol% n-hexane, 25 vol% n-heptane, 30 vol% n-octane and 15 vol% n-nonane) in a 25ml measuring cylinder with a plug, making a field wax sample into a sphere with the size of 1g according to the standard of SY/T6300-one 2009, putting the sphere into the solvent, and observing the wax dissolving condition, wherein indoor experimental results show that the wax dissolving rate is low and is only 0.015g/min, and the field requirements cannot be met.
Comparative example 3
65ml of organic solvent (30 vol% n-hexane, 25 vol% n-heptane, 30 vol% n-octane and 15 vol% n-nonane) and 35ml of n-butanol are measured, a field wax sample is made into a ball shape with the size of 1g according to the standard in SY/T6300-.
Comparative example 4
The former thought is mainly dissolving wax samples, according to the research data, adjusting thought, changing dissolution into dispersion, adding penetrating agent indoors, improving the efficiency of the wax dissolving agent, respectively measuring 325ml of organic solvent (20 vol% n-hexane +20 vol% n-heptane +10 vol% n-octane and 50 vol% n-nonane) and pouring into a stirring container, adjusting the rotating speed of the stirrer until the vortex formed by the liquid can be seen at the top end of the central shaft of the blade of the stirrer, adding 90ml of n-butanol into the mother liquor, fully stirring for 15-30min until the solution is fully dissolved uniformly, adding 85ml of alkylphenol polyoxyethylene, stirring in a reaction kettle at 40 ℃ until the solution is fully dissolved into uniform solution, making the field wax samples into 1g of spherical shapes according to the standard of SY/T6300 and 2009, putting into 15ml of the solvent, observing the wax dissolving condition, and indicating that the wax samples can be dispersed into large particles by indoor experimental results, but the time is long (more than 95 min), and the difference exists with the field requirement.
Comparative example 5
On the basis of comparative example 4, in order to shorten the dispersion time, a spreading agent was added to the above solvent, and a co-penetrating agent rapidly penetrated the minute voids of the wax crystals, and trial experiments were conducted indoors: respectively measuring 325ml of organic solvent (20 vol% n-hexane, 20 vol% n-heptane, 10 vol% n-octane and 50 vol% n-nonane) and pouring the organic solvent into a stirring container, adjusting the rotation speed of the stirrer until the top end of a central shaft of a stirrer blade can be seen by a vortex formed by liquid, adding 90ml of n-butanol into the mother solution, fully stirring for 15-30min until the solution is fully dissolved uniformly, adding 55ml of alkylphenol polyoxyethylene and 30ml of polyether modified siloxane betaine surfactant into a reaction kettle at 40 ℃ and stirring until the solution is fully dissolved into a uniform solution, manufacturing an on-site wax sample into a 1g large sphere according to the standard SY/T6300-one 2009, putting the spherical sphere into 15ml of the solvent, and observing the wax dissolving condition, wherein indoor experiment results show that most of the wax sample can be dispersed in a short time, but dispersed particles are large.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (2)
1. A wax crystal dispersing agent for reviving high wax-containing condensate gas reservoirs is characterized by comprising the following components in percentage by mass: 50-65% of organic solvent A, 12-18% of organic solvent B, 8-15% of penetrating agent, 4-10% of dispersing agent, 1-8% of synergist and 4-10% of mutual solvent;
the organic solvent A is an organic alkane solvent; the organic solvent B is lower alcohol I;
the organic alkane solvent is one or more of n-hexane, n-heptane, n-octane and n-nonane; the lower alcohol I is one or the mixture of n-butyl alcohol and isobutyl alcohol;
the penetrating agent is an ether nonionic surfactant; the dispersing agent is polyether modified siloxane betaine surfactant; the synergist is organic ether; the mutual solvent is lower alcohol II;
the ether nonionic surfactant is alkylphenol ethoxylates;
the organic ether is ethylene glycol butyl ether;
the lower alcohol II is one or two of ethanol and propanol.
2. The method for preparing the wax crystal dispersant for reviving high wax-containing condensate gas reservoir as claimed in claim 1, comprising the steps of:
1) weighing the raw materials according to the mixture ratio, wherein the raw materials and the mass percentage of the raw materials comprise: 50-65% of organic solvent A, 12-18% of organic solvent B, 8-15% of penetrating agent, 4-10% of dispersing agent, 1-8% of synergist and 4-10% of mutual solvent;
2) and taking the organic solvent A as mother liquor, sequentially adding the organic solvent B, the penetrating agent, the dispersing agent, the synergist and the mutual solvent into the weighed mother liquor, and uniformly stirring to obtain the wax crystal dispersing agent.
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| CN202111230905.4A CN113930225B (en) | 2021-10-22 | 2021-10-22 | Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof |
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| CN202111230905.4A CN113930225B (en) | 2021-10-22 | 2021-10-22 | Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof |
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