CN115322763B - Biological acidolysis blocking agent, preparation method thereof and application thereof in low-permeability reservoir - Google Patents
Biological acidolysis blocking agent, preparation method thereof and application thereof in low-permeability reservoir Download PDFInfo
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- CN115322763B CN115322763B CN202211045394.3A CN202211045394A CN115322763B CN 115322763 B CN115322763 B CN 115322763B CN 202211045394 A CN202211045394 A CN 202211045394A CN 115322763 B CN115322763 B CN 115322763B
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- 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
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- 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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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/582—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of bacteria
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Abstract
The invention provides a biological acid plugging agent, a preparation method thereof and application thereof in a low-permeability reservoir, and relates to the technical field of oilfield plugging agents. The biological acidolysis plugging agent provided by the invention comprises the following components in parts by mass: 10-15 parts of bioactive enzyme, 42-56 parts of acetic acid, 10-28 parts of propionic acid, 3-12 parts of complexing agent, 3-12 parts of clay stabilizer and 3-12 parts of cleanup additive. The blocking remover provided by the invention is a biological preparation, can effectively remove blocking of a low-permeability reservoir, does not damage a stratum skeleton while recovering the stratum permeability, and is safer and more environment-friendly; the biological enzyme activity period recorded for years greatly exceeds the validity period of the traditional chemical products; the blocking remover has low flowback after construction, does not generate toxic and harmful gas in the traditional acid solution blocking removal, meets the requirement of the HSE working environment in oilfield exploitation, is beneficial to environmental protection and saves construction cost. The biological acid blocking remover provided by the invention has good application prospect for low-permeability reservoirs.
Description
Technical Field
The invention relates to the technical field of oilfield plugging removal agents, in particular to a biological plugging removal agent, a preparation method thereof and application thereof in a low-permeability reservoir.
Background
In the petroleum exploitation process, the oil layer is blocked by heavy hydrocarbon, inorganic salt scale, iron compounds, biological membranes and the like due to the reasons of formation pressure, temperature reduction, crude oil degassing, bacterial metabolite aggregation and the like, particularly the permeability and the porosity of a low-permeability oil layer are small, and the permeability resistance is rapidly increased along with the enhancement of capillary acting force, so that the oil recovery or water injection rate is rapidly decreased. Therefore, the oil layer needs to be unblocked to recover the seepage capability of the oil layer and improve the recovery ratio.
At present, an acidification method is mainly adopted for the blocking removal of an oil layer, wherein an earth acid (mixed acid of hydrofluoric acid and hydrochloric acid) is generally adopted for the acidification of the oil layer, but most of acid liquor enters a medium-high permeable layer by the method, and only a small part of acid liquor enters a low permeable layer, so that the blocking removal effect of the low permeable oil layer is poor; moreover, the method has short effective period, which is only about two months. In addition, hydrofluoric acid has strong corrosiveness, is easy to cause environmental pollution, and is easy to cause secondary damage to an oil layer. The current acidizing method is not ideal for the unblocking effect of a low permeability reservoir.
Disclosure of Invention
In view of the above, the present invention aims to provide a biological acid blocking remover, a preparation method thereof and application thereof in low permeability reservoirs. The biological acid plugging agent provided by the invention can be used for effectively plugging a low-permeability reservoir, and the stratum skeleton is not damaged while the stratum permeability is recovered; the effective period is long; and the corrosion is small, and the environment is protected.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a biological acidolysis plugging agent which comprises the following components in parts by weight:
preferably, the biological acid blocking remover comprises the following components in parts by mass:
preferably, the biologically active enzyme is a SUN-Y100 biological enzyme.
Preferably, the complexing agent is an ammonium salt complex complexing agent.
Preferably, the ammonium salt compound complexing agent is an HJZ-102 ammonium salt compound complexing agent.
Preferably, the clay stabilizer is a mixture of dimethyl dichlorosilane and ammonium chloride, and the mass ratio of the dimethyl dichlorosilane to the ammonium chloride is 2-5:1.
Preferably, the cleanup additive is a frac acidizing cleanup additive.
The invention provides a preparation method of the biological acidolysis plugging agent, which comprises the following steps:
mixing the bioactive enzyme, acetic acid, propionic acid, a complexing agent, a clay stabilizer and a cleanup additive to obtain the biological acid blocking remover.
The invention provides the application of the biological acid plugging agent in the low-permeability reservoir.
Preferably, the method of application comprises: mixing the biological acid plugging agent with water to obtain biological acid plugging solution; injecting the biological acidolysis plugging liquid into a low-permeability reservoir; the mass ratio of the biological acidolysis plugging agent to water is (18-57): (82-43).
The invention provides a biological acidolysis plugging agent which comprises the following components in parts by weight: 10-15 parts of bioactive enzyme, 42-56 parts of acetic acid, 10-28 parts of propionic acid, 3-12 parts of complexing agent, 3-12 parts of clay stabilizer and 3-12 parts of cleanup additive. In the invention, the bioactive enzyme can change the wettability of the rock (from oil wet to water wet), degrade wax and reduce viscosity, effectively eliminate residues such as polymers and the like attached to the surface of the rock of the low-permeability reservoir rock, clean the roar and increase the permeability; the acetic acid and the propionic acid can chemically react with components such as carbonate rock, clay mineral and the like in the low-permeability reservoir, so that the permeability of an oil layer is improved, and the acetic acid and the propionic acid are weak acids with low corrosiveness, so that the damage degree to the rock layer is low, and the oil reservoir protection characteristics are obvious; the complexing agent, acetic acid and propionic acid act together in the reservoir, and can generate stable chelate with inorganic scale metal ions in the reservoir; the clay stabilizer can enable the blocking remover to form a layer of protective film on the surface layer of an oil reservoir while playing the blocking removing effect, inhibit the expansion and sand production of stratum clay, prevent the migration of particles, has good effect of stabilizing water-sensitive clay minerals, and has no danger of causing the wetting of stratum oil while recovering the permeability of the stratum; the cleanup additive is used for flowback of the working raffinate from the stratum. The blocking remover provided by the invention has the following beneficial effects:
(1) The blocking remover provided by the invention is a biological preparation, can effectively remove blocking of a low-permeability reservoir, has good effects of preventing swelling and stabilizing water-sensitive clay minerals, effectively eliminates blocking of polymers and inorganic scales, does not damage a stratum skeleton while recovering the permeability of the stratum, has the advantages of low toxicity, low corrosiveness, low odor and biodegradability, and is safer and more environment-friendly; compared with the traditional acidification product, the blocking remover provided by the invention is not influenced by factors such as pressure, water mineralization, shearing, degradation and the like, and has wider application range and scene;
(2) The biological enzyme activity period recorded for years greatly exceeds the effective period of the traditional chemical product process;
(3) The blocking remover provided by the invention has the advantages of no solid phase and residue in operation, low flowback after construction, no generation of toxic and harmful gas in the traditional acid liquid blocking removal process engineering, and not only meets the requirement of the HSE working environment in oilfield exploitation, but also is beneficial to environmental protection and saves construction cost.
Therefore, the biological acid blocking remover provided by the invention has good application prospect for low-permeability reservoirs.
The invention also provides a preparation method of the biological acid blocking remover, which has simple process, easy operation and convenient mass production.
Drawings
FIG. 1 is a graph showing the time-dependent dissolution rate of biological acid plugging solutions of different mass concentrations in the examples.
Detailed Description
The invention provides a biological acidolysis plugging agent which comprises the following components in parts by weight:
the biological acid blocking remover provided by the invention comprises 10-15 parts by mass of biological active enzyme, preferably 10.5-15 parts by mass, and more preferably 10.5-12 parts by mass. In the present invention, the bioactive enzyme is preferably SUN-Y100 bio-enzyme, developed by victory oil field victory chemical industry Co., ltd, and the SUN-Y100 bio-enzyme is a protein-based catalyst. In the invention, the bioactive enzyme has the main functions of changing the wettability, degrading and reducing viscosity of the rock, effectively eliminating residues such as polymers and the like attached to the surface of the rock of the low-permeability reservoir rock, cleaning the roar and increasing the permeability, and the specific action mechanism is as follows: the bioactive enzyme changes the rock from oil wet to water wet by changing the wettability of the rock, degrading wax and reducing viscosity, reduces the flow resistance of crude oil in the gaps of the low-permeability stratum, releases the crude oil from the surfaces of rock particles, separates out from the micro-gaps, and gathers flowing oil drops in the stratum; the bioactive enzyme is soluble in water and insoluble in oil, can be transported to a zone further around the sandstone stratum in a water transportation mode, and opens a new circulation channel to generate a new oil storage channel in the sandstone stratum, so that the purposes of displacing oil and improving the yield are achieved, and the problems of strong heterogeneity, poor physical property conditions, non-development of cracks and the like of a low-permeability reservoir are improved.
Based on the mass parts of the bioactive enzyme, the biological acid blocking remover provided by the invention comprises 42-56 parts of acetic acid, preferably 48-56 parts, and more preferably 50-56 parts. In the invention, the acetic acid is weak acid with small corrosiveness, and can effectively perform chemical action with components such as carbonate rock, clay mineral and the like in oil layer rock so as to improve the permeability of the oil layer.
Based on the mass parts of the bioactive enzyme, the biological acid blocking remover provided by the invention comprises 10-28 parts of propionic acid, preferably 12-28 parts, and more preferably 14-20 parts. In the invention, the propionic acid is weak acid with small corrosiveness, and can chemically react with carbonate rock, clay mineral and other components in oil layer rock to improve the permeability of the oil layer.
Based on the mass parts of the bioactive enzyme, the biological acid blocking remover provided by the invention comprises 3-12 parts of complexing agent, preferably 3.5-12 parts, and more preferably 4-10 parts. In the embodiment of the invention, the complexing agent is preferably an ammonium salt complex complexing agent, and in the embodiment of the invention, the ammonium salt complex complexing agent is an ammonium salt complex complexing agent with the model of HJZ-102 manufactured by Kaifeng Heng Biotechnology Co. In the invention, the complexing agent, acetic acid and propionic acid act together in the reservoir, and can generate stable chelate with inorganic scale metal ions in the reservoir.
Based on the mass parts of the bioactive enzyme, the biological acid blocking remover provided by the invention comprises 3-12 parts of clay stabilizer, preferably 3.5-12 parts, and more preferably 4-10 parts. In the present invention, the clay stabilizer is preferably a mixture of dimethyldichlorosilane and ammonium chloride, and the mass ratio of dimethyldichlorosilane to ammonium chloride is preferably 2 to 5:1, more preferably 3:1. According to the invention, the clay stabilizer can inhibit the expansion of stratum clay and the migration of clay particles, and can form a layer of protective film on the surface layer of an oil reservoir while the blocking remover plays a role in blocking removal, so that the clay stabilizer can inhibit the expansion of stratum clay, sand out and prevent the migration of particles, has a good effect of stabilizing water-sensitive clay minerals, and has no danger of causing the wetting of stratum oil while recovering the permeability of the stratum.
Based on the mass parts of the bioactive enzyme, the biological acid blocking remover provided by the invention comprises 3-12 parts of a cleanup additive, preferably 3.5-12 parts, and more preferably 4-10 parts. In the embodiment of the invention, the cleanup additive is preferably a cleanup additive for fracture acidizing, and in the embodiment of the invention, the cleanup additive is a cleanup additive for fracture acidizing, which is manufactured by Henan Silong chemical Co., ltd. In the present invention, the cleanup additive serves to increase the rate of flowback of the working raffinate from the formation.
The biological acid plugging agent provided by the invention can be used for effectively plugging a low-permeability reservoir, and the stratum skeleton is not damaged while the stratum permeability is recovered; the effective period is long; and the corrosion is small, and the environment is protected.
The invention provides a preparation method of the biological acid blocking remover, which comprises the following steps:
mixing the bioactive enzyme, acetic acid, propionic acid, a complexing agent, a clay stabilizer and a cleanup additive to obtain the biological acid blocking remover.
In the invention, the mixing is carried out at normal temperature; the method of mixing is not particularly limited in the present invention, and the components may be uniformly mixed by a mixing method well known to those skilled in the art.
The preparation method of the biological acid blocking remover provided by the invention has the advantages of simple process, easiness in operation and convenience in large-scale production.
The invention also provides application of the biological acid plugging agent in a low-permeability reservoir. In the present invention, the permeability of the low permeability reservoir is preferably 0.1 to 50 millidarcy (mD); the method of application preferably comprises: mixing the biological acid plugging agent with water to obtain biological acid plugging solution; injecting the biological acidolysis plugging liquid into a low-permeability reservoir; the mass ratio of the biological acid blocking remover to water is preferably (18-57): (82-43), specifically, 18:82, 30:70, 36:64, 45:55, 57:43. The method for mixing the biological acid plugging agent and the water has no special requirement, and the biological acid plugging agent and the water are uniformly mixed by a method well known to a person skilled in the art; the biological acid plugging removing agent and water are preferably mixed on a construction site, namely the biological acid plugging removing liquid is preferably prepared and used at once.
The biological de-plugging agents provided by the present invention, methods for their preparation and their use in low permeability reservoirs are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the invention.
In various embodiments, the bioactive enzyme is SUN-Y100 bioenzyme developed by victory oilfield victory chemical industry Limited; the clay stabilizer is prepared by compounding dimethyl dichlorosilane and ammonium chloride according to a mass ratio of 3:1; the complexing agent is an ammonium salt compound complexing agent, and the model is HJZ-102, which is produced by Heng June Biotechnology Co., ltd; the cleanup additive is cleanup additive for fracture acidification, model CL-606, and is produced by Henan Silong chemical industry Co.
Example 1
A biological acidolysis plugging agent is prepared by the following steps:
weighing 16g of acetic acid, 4g of propionic acid, 4g of bioactive enzyme, 4g of complexing agent, 4g of clay stabilizer and 4g of cleanup additive, and uniformly stirring at normal temperature to obtain the biological acid plugging agent.
When in use, 36g of the biological acid blocking remover and 164g of water obtained in the above way are fully and uniformly stirred to prepare the biological acid blocking remover.
Example 2
A biological acidolysis plugging agent is prepared by the following steps:
weighing 32g of acetic acid, 10g of propionic acid, 6g of bioactive enzyme, 4g of complexing agent, 4g of clay stabilizer and 4g of cleanup additive, and uniformly stirring at normal temperature to obtain the biological acid plugging agent.
When in use, 60g of the biological acid plugging agent and 140g of water obtained by the method are fully and uniformly stirred to prepare the biological acid plugging liquid.
Example 3
A biological acidolysis plugging agent is prepared by the following steps:
40g of acetic acid, 10g of propionic acid, 8g of bioactive enzyme, 4g of complexing agent, 5g of clay stabilizer and 5g of cleanup additive are weighed and stirred uniformly at normal temperature to obtain the biological acid blocking remover.
When in use, 72g of the biological acid plugging agent and 128g of water obtained by the method are fully and uniformly stirred to prepare the biological acid plugging liquid.
Example 4
A biological acidolysis plugging agent is prepared by the following steps:
weighing 50g of acetic acid, 16g of propionic acid, 12g of bioactive enzyme, 4g of complexing agent, 4g of clay stabilizer and 4g of cleanup additive, and uniformly stirring at normal temperature to obtain the biological acid plugging agent.
When in use, 90g of the biological acid plugging agent and 110g of water obtained by the method are fully and uniformly stirred to prepare the biological acid plugging liquid.
Example 5
A biological acidolysis plugging agent is prepared by the following steps:
56g of acetic acid, 30g of propionic acid, 16g of bioactive enzyme, 4g of complexing agent, 4g of clay stabilizer and 4g of cleanup additive are weighed and stirred uniformly at normal temperature to obtain the biological acid blocking remover.
When in use, 114g of the biological acid plugging agent and 86g of water obtained by the method are fully and uniformly stirred to prepare the biological acid plugging liquid.
The appearance and physical and chemical properties of the biological acid blocking agents prepared in examples 1 to 5 were tested, and the following were specific:
the appearance and physicochemical properties of the biological acid plugging solutions prepared in examples 1 to 5 are shown in table 1:
table 1 appearance and physicochemical Properties of the biological acid plugging solutions prepared in examples 1 to 5
| Appearance of | Uniform viscous liquid |
| pH value of | 2～5 |
| Density (g/cm) 3 ) | ≥1.06 |
Table 2 is surface tension data measured at normal temperature using a surface tensiometer, using the biological deblocking agent of example 3 formulated as aqueous solutions of different mass concentrations:
TABLE 2 surface tension data for biological deblocking agent of example 3
The surface tension of the biological blocking remover of other examples was measured according to the method of Table 2, and as a result, the surface tension was not more than 30mN/m. The surface tension of the biological acid blocking remover prepared by the embodiment of the invention is less than or equal to 30mN/m, the smaller the surface tension is, the smaller the shrinkage force is, the better the wettability is, the easier the biological acid blocking remover spreads on the surface, and the easier the solution wets the solid stratum.
Table 3 is corrosion inhibition performance data of biological acid plugging solutions prepared from the biological acid plugging agent of example 3 with different mass concentrations, and the method for testing the corrosion inhibition performance is as follows: under the condition of 70 ℃, the corrosion influence on N80 hanging pieces under the flowing state (normal pressure dynamic corrosion performance) of biological acid-plugging solution with different concentrations (the mass of the biological acid-plugging agent/(the mass of the biological acid-plugging agent plus the mass of water)) is examined, the experiment time is 4 hours, and 3 parallel experiments are carried out on the biological acid-plugging solution with the same mass concentration.
TABLE 3 Corrosion inhibition Performance data for biological acid blocking solution formulated from biological acid blocking agent of example 3 at different mass concentrations
The biological acid blocking agents of other examples were tested for corrosion inhibition by the method of Table 3, resulting in an average corrosion to N80 hanging pieces of less than 2 g/(m) 2 H). The biological acid blocking remover prepared by the embodiment of the invention has very low corrosion to steel, and the average corrosiveness is lower than 2 g/(m) 2 H) the corrosion rate is less than the industry first level standard (SY/T5405-2019, at 60 ℃ less than or equal to 5 g/(m) 2 H), good corrosion inhibition performance.
Table 4 is the dissolution rate test data of the biological acid plugging agents of example 3 to rock powder, wherein the biological acid plugging agents are prepared into biological acid plugging solutions with different mass concentrations (the mass concentrations are respectively 10%, 20% and 40%, and are respectively recorded as 10% biological acid solution, 20% biological acid solution and 40% biological acid solution), and the test method is as follows: in order to study the corrosion effect of the biological acid-removal plugging liquid on rock powder, the dissolution rate of the biological acid-removal plugging liquid with different concentrations on the rock powder is observed under the flowing experimental condition at 70 ℃.
TABLE 4 dissolution test results data for biological acid plugging solutions prepared from the biological acid plugging agent of example 3 at different mass concentrations
The data of the dissolution test results of the biological acidolysis plugging solutions with different mass concentrations are plotted as a graph, and the graph is shown in fig. 1.
As can be seen from table 4 and fig. 1, the biological acid plugging solutions with 3 concentrations have an effect on the dissolution rate, and the higher the concentration of the biological acid solution, the higher the dissolution rate; the dissolution and stall rate is faster within the initial 2 hours, the dissolution and stall reaction is carried out within 10 hours after 2 hours, the dissolution and stall rate is increased gradually and is reduced along with the time extension, the biological acidolysis plugging liquid has a certain retarding effect, and the low-concentration biological acid liquid has better retarding property, so that the deep acidification of the stratum is facilitated.
The application performance test is carried out on the biological acidolysis plugging fluid prepared by the biological acidolysis plugging agent in examples 1 to 5, and the method is as follows:
the core used in the test experiment is taken from the same horizon of two wells, 5 samples are taken in total, wherein the core sample number taken from the first well is 1 (1), 1 (2), the core sample number taken from the second well is 2 (1), 2 (2) and 2 (3), the length of the sample is 2.9 cm-3.5 cm, and the diameter is 2.5cm. Firstly, three experimental factors are unified through experiments: injection concentration, injection speed and core physical properties, wherein the injection acid concentration is the concentration of the mixture ratio of the embodiment 1 to the embodiment 5 respectively; the level of the acid injection rate was designed to be 0.2mL/min. The testing process mainly comprises the following steps: 1) Measuring the porosity and permeability of the selected core, and analyzing the core skeleton and the roar characteristic by using a CT scanner; 2) Injecting acid according to the designed injection speed, concentration and acid quantity (the acid quantity is set according to the size of the rock core volume), and driving the residual acid by water; 3) And (5) measuring the porosity and permeability of the core after acid injection, and scanning the skeleton and the roar characteristic again by CT. The test results are shown in table 5:
TABLE 5 Table of changes in core permeability and porosity before and after acid injection
From Table 5, it can be seen that the various concentrations of the biological acid solutions of examples 1-5 have a certain effect on the increase of core pores and permeability; the concentration of the biological acid solution in examples 1 to 5 is gradually increased, the acidification effect of the medium concentration is obviously better than that of the low concentration acid and the high concentration acid, and the low concentration acid is in example 1 because the acid content is low, so that the chemical reaction speed is slower, the corrosion amount is smaller, the roar change is not large, and the acidification effect is relatively poor; however, the high concentration of acid, for example 5, resulted in too high a reaction rate due to too high a concentration of acid, and the core part of the framework particles were eroded to produce fine particles which blocked the roar during migration, but rather caused small changes in permeability.
The biological acid plugging removal technology (the mixture ratio of the biological acid plugging removal agent in the embodiment 3 is adopted, and the biological acid plugging removal liquid is prepared according to the method of the embodiment 3) is implemented in a Xinjiang oil field, the average daily yield before the measure is 0.5t, the daily oil yield of a single well after the measure is 2t, the total effective rate after the measure is 100%, the increase in the yield is 6264t in the accumulation in the current year, the good plugging removal effect is achieved, the return discharge capacity is small, and the concrete is shown in the table 6.
TABLE 6 statistical Table of blocking removal effect of biological blocking remover on Xinjiang oilfield
From the above embodiments, it can be seen that the biological plugging agent provided by the invention can effectively plug a low-permeability reservoir, has low corrosiveness, and does not damage the stratum skeleton while recovering the stratum permeability.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The biological acidolysis plugging agent is characterized by comprising the following components in parts by weight:
the bioactive enzyme is SUN-Y100 bioactive enzyme; the complexing agent is an ammonium salt compound complexing agent; the clay stabilizer is a mixture of dimethyl dichlorosilane and ammonium chloride, and the mass ratio of the dimethyl dichlorosilane to the ammonium chloride is 2-5:1; the biological acid blocking remover is applied to a low-permeability reservoir, and the permeability of the low-permeability reservoir is 0.1-50 millidarcy.
2. The biological acid plugging agent according to claim 1, which is characterized by comprising the following components in parts by mass:
3. the biological acid plugging agent according to claim 1, wherein the ammonium salt compound complexing agent is HJZ-102 ammonium salt compound complexing agent.
4. The biological acid plugging agent according to claim 1 or 2, wherein said cleanup agent is a frac acidizing cleanup agent.
5. The method for preparing the biological acid plugging agent according to any one of claims 1 to 4, comprising the steps of:
mixing the bioactive enzyme, acetic acid, propionic acid, a complexing agent, a clay stabilizer and a cleanup additive to obtain the biological acid blocking remover.
6. Use of the biological plugging agent according to any one of claims 1 to 4 or prepared by the preparation method according to claim 5 in low permeability reservoirs.
7. The application of claim 6, wherein the method of application comprises: mixing the biological acid plugging agent with water to obtain biological acid plugging solution; injecting the biological acidolysis plugging liquid into a low-permeability reservoir; the mass ratio of the biological acidolysis plugging agent to water is (18-57): (82-43).
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| Title |
|---|
| Study and application of a new blockage remover in polymer injection wells;Yiyong Pan,等;Petroleum;第第4卷卷(第第3期期);第329-336页 * |
| 生物酶在新疆油田三叠系克上组油藏的研究及运用;龙军; 翟亮; 芮雪莹; 刘旻昊; 孙波;内蒙古石油化工;第第46卷卷(第第11期期);第115-117页 * |
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| Publication number | Publication date |
|---|---|
| CN115322763A (en) | 2022-11-11 |
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