CN113462371A - Hot acid drainage-assisted deblocking agent for low-pressure shallow oil well and application method thereof - Google Patents
Hot acid drainage-assisted deblocking agent for low-pressure shallow oil well and application method thereof Download PDFInfo
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- 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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- 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
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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Abstract
The invention belongs to a thermal acid-assisted drainage blockage removing agent for a low-pressure shallow oil well and an application method thereof; comprises three parts of thermal acid assistant block removal agent A, B and C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 20-40% of sodium nitrate, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 20-30% of urea, 0-5% of sodium azide, 5-10% of hydrazine dihydrochloride, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 10-20% of hydrochloric acid, 5-15% of acetic acid, 0.5-1.0% of polymaleic anhydride, 1-3% of ethylene diamine tetramethylene phosphate, 10-30% of toluene, 5-10% of ethanol monobutyl ether, 0.5-2.0% of fatty alcohol polyoxyethylene ether, 1.0-5.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water; the construction adopts the method of respectively preparing in the mixed injection, and has the advantages of generating gas and heat, removing organic and organic blockage and improving residual liquid flowback.
Description
Technical Field
The invention belongs to the technical field of oil and gas field reservoir transformation, and particularly relates to a thermal acid-assisted drainage blocking remover for a low-pressure shallow oil well and an application method thereof.
Background
The shallow well is buried shallowly and has low temperature, the stratum energy is reduced in gradient in the long-term exploitation process, meanwhile, the long-term exploitation causes the original balance of oil gas and water in a reservoir to be damaged and interfered, various blockages are easy to generate, the output of the oil well is influenced, generally, the blockage types of the oil well mainly comprise inorganic scale blockage, oil-water emulsion and water lock damage, colloid asphaltene and wax deposition damage and the like, the common blockage removing measure is acidification at present, but for the low-pressure shallow oil well, along with the deep development, the oil layer pressure is gradually reduced, the acidified residual liquid of the oil well at present can hardly be discharged back, the secondary precipitation pollution of residual acid liquid is particularly obvious, the effective rate of acidification construction is greatly reduced, meanwhile, the conventional acidification measure has limited effect on removing the blockage of organic matters such as colloid, asphaltene and the like of the oil well, and the like, and the blockage removing process formula needs to be perfected, improving the overall relieving capacity.
For the liquid drainage of low pressure oil well, measures such as mechanical forced drainage, artificial gas injection induced drainage or gas lift, autogenous associated gas energizing and the like are usually adopted, wherein the common autogenous gas technology is that chemical raw materials react with each other to generate a large amount of CO2、N2Gas is used for increasing formation energy, reducing the tension of an oil-water interface, reducing the viscosity of crude oil and promoting the flowback of residual liquid, the technology is more applied to tertiary oil recovery and acid fracturing, and CN103333670B divides the currently common in-layer gas generating systems into four types according to a reaction mechanism: the first type is that one or two chemical agents are utilized to decompose or generate chemical reaction at a certain formation temperature to generate gas, and the technology has the defect that the decomposition reaction is endothermic reaction and can cause local temperature reduction of the formation to generate cold damage when a certain decomposition temperature is required, generally more than 90 ℃. For example, autogenous CO2Oil displacement technology and oil displacement effect research, oil drilling and production process, first phase of volume 29 of 2007, authors adopt a chemical agent to decompose and produce a large amount of CO in stratum2The required condition is a high temperature reservoir; research and application of autogenous gas composite foam profile control technology, Xinjiang petroleum technology, No. 17, No. 4 of 2007, authors utilize two chemical agents to react in the formation to generate a large amount of gas, and the required conditions are that the temperature is higher than 150 ℃ and the reaction catalyst; the second kind, using nitrite and ammonia salt to react under the catalysis of acid medium to generate a large amount of gas, the technique has the defects that the gas generating system and acid liquid can not be mixed on the ground, and need to adopt isolation liquid,the multi-slug injection has complex construction process, and the gas-liquid and acid liquid have incomplete reaction in the stratum. Such as NaNO2And NH4CL reaction kinetics and its application in oil fields, oil drilling and production technology, vol.17, No. 5 in 1995, the authors used sodium nitrite and ammonium chloride solution to generate gas and heat under the catalysis of acid to unblock and energize; CN101671553A is made into spherical shape by using sodium nitrite and foaming agent as A agent, ammonium chloride, ethylene diamine tetraacetic acid, acidic substance catalyst and foam stabilizer as B agent, A, B agent is injected during construction, and gas is generated by mixing under stratum condition; the third kind, urea substance, nitrite and acid react under the action of catalyst, produce a large amount of gas and discharge a large amount of heat, the defect of this kind of technology is that gas generating system and acid liquor can't be mixed on the ground, need to adopt the spacer fluid, the multi-stage stopper is injected, the construction process is complicated, for example CN1693656A mixes A agent by hydrochloric acid, glacial acetic acid and intersolunt, urea and ammonium nitrate mix into B agent, a molybdenum-containing oxidizing agent is used as catalyst, use and inject A agent first on the spot, inject the mixed solution of B agent and catalyst after isolating with the clear water; in the fourth category, carbonates and bicarbonates react with acid to form CO2The gas, such techniques have the defects of less gas generation amount, complex construction process and over-high reaction speed, such as self-generated CO of heavy oil reservoir2Indoor research on huff and puff technology, special oil and gas reservoir, vol 12, No. 6, 2005, the authors used easily soluble carbonate and bicarbonate to react with low-concentration hydrochloric acid to form CO2A gas.
The self-gas generation system has the following problems: (1) the self-gas generation system which generates decomposition reaction depending on the formation temperature has high initiation temperature and less gas generation amount, and is not suitable for shallow low-temperature oil reservoirs; (2) an autogenous gas generation system which needs two or more than two chemical agents to react after being mixed in the stratum has poor reaction controllability, complex construction process and low utilization efficiency of raw material components; (3) the dispersion to organic blocking substances is poor, the compatibility with inorganic scale blocking remover is poor, and the blocking removing effect is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a thermal acid-assisted drainage blockage removing agent for a low-pressure shallow oil well, which can generate gas and generate heat, improve the residual liquid drainage capability and have blockage removing performance on organic blockages and inorganic blockages, and an application method thereof.
The purpose of the invention is realized as follows: the method comprises the following steps: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 20-40% of sodium nitrate, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 20-30% of urea, 0-5% of sodium azide, 5-10% of hydrazine dihydrochloride, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 10-20% of hydrochloric acid, 5-15% of acetic acid, 0.5-1.0% of polymaleic anhydride, 1-3% of ethylene diamine tetramethylene phosphate, 10-30% of toluene, 5-10% of ethanol monobutyl ether, 0.5-2.0% of fatty alcohol polyoxyethylene ether, 1.0-5.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
The method comprises the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
The most important improvement point of the invention is that (1) a new gas-generating and heat-generating system is found, a composite system is adopted to realize the reaction succession of different stages, different raw materials are mutually cooperated to achieve the aim of more gas-generating and heat-generating, and the self-initiation function of the system is realized by utilizing the self characteristic of hydrazine dihydrochloride, no extra activating agent is needed to be added, the self characteristic of sodium azide is utilized to realize the regulation and control of the initiation performance of the system, the initiation rate of the system is controlled, and the gas-generating and heat-generating with controllable rate is realized; (2) the combination of gas production and heat generation and blockage removal is provided, A, B agents are used for gas production and heat generation to improve the temperature and pressure of a reservoir stratum, C agents are used for dissolving and removing inorganic scale and organic blocking matters, and the three agents are mutually matched and interacted to realize blockage removal of a low-pressure shallow oil well.
Compared with the prior art, the invention adopts the gas-generating and heat-generating system of the composite system, various raw materials can realize continuous reaction from low temperature to high temperature in different stages according to the characteristics of the raw materials, so that the gas-generating and heat-generating reaction is carried out more smoothly, the self-initiated activation and controllable adjustment of the system are realized, the mixed injection and uniform reaction of the system are ensured, the mixed injection of the gas-generating and heat-generating product and the deblocking agent is realized, the mutual cooperation and interaction of the gas-generating and heat-generating product and the deblocking agent are improved, and the deblocking effect is enhanced; the use of the surfactant enables the system to generate foam under the action of gas, reduces the liquid column pressure of injected liquid, is more favorable for the flowback of the liquid, enhances the flowback effect of the residual liquid in a low-pressure shallow well, and realizes the purposes of generating gas and generating heat, improving the flowback capability of the residual liquid and realizing the blockage removing function on organic and inorganic blockages by matching and cooperating various components.
Detailed Description
The invention relates to a thermal acid-assisted plug removal agent for a low-pressure shallow oil well and an application method thereof, wherein the thermal acid-assisted plug removal agent comprises the following components: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 20-40% of sodium nitrate, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 20-30% of urea, 0-5% of sodium azide, 5-10% of hydrazine dihydrochloride, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 10-20% of hydrochloric acid, 5-15% of acetic acid, 0.5-1.0% of polymaleic anhydride, 1-3% of ethylene diamine tetramethylene phosphate, 10-30% of toluene, 5-10% of ethanol monobutyl ether, 0.5-2.0% of fatty alcohol polyoxyethylene ether, 1.0-5.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
The method comprises the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
Example one
A thermal acid-assisted drainage and blockage removal agent for a low-pressure shallow oil well and an application method thereof are provided, and the thermal acid-assisted drainage and blockage removal agent comprises: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 20 percent of sodium nitrate, 0.5 percent of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 20% of urea, 5% of sodium azide, 5% of hydrazine dihydrochloride, 0.5% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 20% of hydrochloric acid, 5% of acetic acid, 0.5% of polymaleic anhydride, 3% of ethylenediamine tetramethylene phosphate, 10% of toluene, 10% of ethanol monobutyl ether, 0.5% of fatty alcohol polyoxyethylene ether, 5.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
The method comprises the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
Example two
A thermal acid-assisted drainage and blockage removal agent for a low-pressure shallow oil well and an application method thereof are provided, and the thermal acid-assisted drainage and blockage removal agent comprises: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 30% of sodium nitrate, 1.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 25% of urea, 2% of sodium azide, 8% of hydrazine dihydrochloride, 1.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 15% of hydrochloric acid, 10% of acetic acid, 1.0% of polymaleic anhydride, 2% of ethylene diamine tetramethylene phosphate, 20% of toluene, 7% of ethanol monobutyl ether, 1.0% of fatty alcohol polyoxyethylene ether, 4.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
The method comprises the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
EXAMPLE III
A thermal acid-assisted drainage and blockage removal agent for a low-pressure shallow oil well and an application method thereof are provided, and the thermal acid-assisted drainage and blockage removal agent comprises: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C. The thermal acid-assisted drainage and blockage removal agent A is prepared from the following components in percentage by weight: 40% of sodium nitrate, 2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent B is prepared from the following components in percentage by weight: 30% of urea, 5% of sodium azide, 5% of hydrazine dihydrochloride, 2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water. The thermal acid-assisted drainage and blockage removal agent C is prepared from the following components in percentage by weight: 10% of hydrochloric acid, 15% of acetic acid, 1.0% of polymaleic anhydride, 1.0% of ethylenediamine tetramethylene phosphate, 30% of toluene, 5% of ethanol monobutyl ether, 2.0% of fatty alcohol polyoxyethylene ether, 1.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
The method comprises the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
The above detailed description is only specific to possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments, modifications, and alterations without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Test example 1
Randomly selecting an experimental example II, comparing the experimental example II with a common gas production system (sodium carbonate + HCL, sodium nitrite + ammonium chloride + glacial acetic acid) to perform gas production and heat generation performance, preparing test samples with the same concentration by using clean water respectively, collecting the gas measurement quantity generated by various systems by adopting a drainage and gas collection method, and recording the temperature of the liquid system after the various systems completely react by using a thermometer, wherein the test result is shown in Table 1.
TABLE 1 comparison of the properties of the different gas-generating systems
| Name (R) | Gas production/ml | Maximum temperature/. degree.C |
| Sodium carbonate + HCL | 876 | 26 (Normal temperature) |
| Sodium nitrite, ammonium chloride and glacial acetic acid | 1254 | 87.4 |
| Experimental example two | 1866 | 96.3 |
According to the measurement result, the gas production rate and the highest temperature of the second experimental example in the three gas production systems are the highest and the gas production rate and the highest temperature of the sodium nitrite, ammonium chloride and glacial acetic acid are the second highest, and the temperature of the sodium carbonate and HCL system is only unchanged, so that the gas production and heat generation capacities of the second experimental example are better than those of the conventional system.
Test example 2
Randomly selecting an experimental example II, comparing the solubility and dispersion properties of the organic blocking substances with those of a common gas production system (sodium carbonate + HCL, sodium nitrite + ammonium chloride + glacial acetic acid), preparing test samples with the same concentration by using clear water, putting the test samples into beakers, taking paraffin as the organic blocking substances, weighing a certain amount of paraffin samples, putting the samples into the beakers containing the test samples, observing the state change of the paraffin in the test sample solution until the test samples completely react, cooling the reaction solution to 10 ℃, filtering the test sample reaction solution by using a 100-mesh standard sieve, leaching filter residues for 3 times by using clear water, naturally drying the filter residues, weighing the filter residues, and calculating the solubility of the paraffin so as to investigate the solubility of different systems on the paraffin, wherein the result is shown in Table 2.
TABLE 2 evaluation of paraffin dissolution degradation performance of different gas-generating system agents
From the measurement results, the paraffin has no change in the state in the sodium carbonate system, the solubility and the dispersibility are zero, and the state change exists in the sodium nitrate and ammonium chloride system, so that the sodium nitrate and ammonium chloride system can melt the paraffin, the solubility rate is low, the performance of dispersing the paraffin is poor, the state change exists in the two systems of the experimental example, the paraffin can be melted, the solubility rate is high, and the capability of dispersing the paraffin is strong, so that the solubility and the dispersibility of the two pairs of organic blockages in the experimental example are superior to those of the conventional gas generating agent.
The test examples described above are some of the test examples of the present invention, and not all of them. The detailed description of the test examples of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected test examples of the present invention. Based on the test examples in the present invention, all other test examples obtained by one of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Claims (5)
1. A thermal acid-assisted drainage blocking remover for a low-pressure shallow oil well and an application method thereof are characterized by comprising the following steps: the hot acid-assisted drainage and blockage removal agent A, the hot acid-assisted drainage and blockage removal agent B and the hot acid-assisted drainage and blockage removal agent C.
2. The thermal acid-assisted plug removal agent for the low-pressure shallow oil well and the application method thereof as claimed in claim 1, wherein the thermal acid-assisted plug removal agent A is prepared from the following components in percentage by weight: 20-40% of sodium nitrate, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water.
3. The thermal acid-assisted plug removal agent for the low-pressure shallow oil well and the application method thereof as claimed in claim 1, wherein the thermal acid-assisted plug removal agent B is prepared from the following components in percentage by weight: 20-30% of urea, 0-5% of sodium azide, 5-10% of hydrazine dihydrochloride, 0.5-2.0% of fatty alcohol glycerol ether sodium sulfonate and the balance of water.
4. The thermal acid-assisted plug removal agent for the low-pressure shallow oil well and the application method thereof as claimed in claim 1, wherein the thermal acid-assisted plug removal agent C is prepared from the following components in percentage by weight: 10-20% of hydrochloric acid, 5-15% of acetic acid, 0.5-1.0% of polymaleic anhydride, 1-3% of ethylene diamine tetramethylene phosphate, 10-30% of toluene, 5-10% of ethanol monobutyl ether, 0.5-2.0% of fatty alcohol polyoxyethylene ether, 1.0-5.0% of fatty alcohol glyceryl ether sodium sulfonate and the balance of water.
5. The thermal acid-assisted drainage and blockage removal agent for the low-pressure shallow oil well as defined in claim 1 and the application method thereof are characterized by comprising the following steps:
step 1: preparing each component according to the designed dosage of a single well in proportion;
step 2: a, B, C are respectively contained in different tanks;
and step 3: connecting the tank body containing A, B, C with high-pressure pumping equipment through a control valve and a manifold, wherein the high-pressure pumping equipment is connected with an oil well through a high-pressure pipeline;
and 4, step 4: the pressure test inspection is carried out on the connection condition of the high-pressure pipeline, and the next construction application can be carried out when the design requirement is met
And 5: the A, B, C three blocking removers are controlled and adjusted by respective pipeline valves according to the proportion of 1:1:1, and are injected into an oil well after being pressurized by high-pressure pumping equipment after being converged by a pipeline.
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