CN111394079A - Oil field microcapsule non-acid self-heating blocking remover and preparation method thereof - Google Patents
Oil field microcapsule non-acid self-heating blocking remover and preparation method thereof Download PDFInfo
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- CN111394079A CN111394079A CN202010285822.4A CN202010285822A CN111394079A CN 111394079 A CN111394079 A CN 111394079A CN 202010285822 A CN202010285822 A CN 202010285822A CN 111394079 A CN111394079 A CN 111394079A
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- 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
- C09K8/536—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning characterised by their form or by the form of their components, e.g. encapsulated material
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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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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Abstract
The invention relates to an oil field microcapsule non-acid self-heating blocking remover and a preparation method thereof, wherein the thermal blocking remover comprises a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B, wherein the mass ratio of the water-soluble microcapsule blocking remover KR-100A to the water-soluble microcapsule blocking remover KR-100B is as follows: 0.9-2.1: 1; the water-soluble microcapsule blocking remover KR-100A is prepared from ammonium chloride, potassium chloride, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide; the water-soluble microcapsule blocking remover KR-100B is prepared from sodium nitrite, sodium nitrate, EDTA-2NA salt, paraffin wax, polyvinyl alcohol and dimethyl sulfoxide. The invention ensures that the capsule core content breaks through the capsule wall under proper conditions, and the capsule core content reacts, releases heat, generates gas and cooperates with other auxiliary agents outside the capsule wall under the initiation of an external catalyst to play the roles of cleaning and unblocking.
Description
Technical Field
The invention relates to the technical field of oil well blockage cleaning, in particular to an oil field microcapsule non-acid self-heating blocking remover and a preparation method thereof.
Background
At present, the oil well is mainly caused by the following aspects:
firstly, formation damage caused by organic matter deposition:
emulsification blockage caused by the action of an additive used in oil well operation and oil water;
wax, colloid, asphalt and the like in the crude oil are separated out due to temperature and pressure changes in the process of production and transportation;
natural gas, CO2The increase in crude oil viscosity after the overflow of gaseous matter leads to plugging.
Secondly, the oil well is blocked by inorganic scale:
the temperature and pressure change causes the precipitation of the produced water salt;
ca formation from injected water incompatible with formation water2+、Mg2+、Ba2+、Sr2+Inorganic scale and the like;
clogging of movable particles such as clay, sand, etc.;
the clay swells and blocks.
The existing oil well blockage removing technology comprises acidification blockage removing, non-acid blockage removing and comprehensive blockage removing (combination of acidification and non-acidification). The simple acidification blockage removing effect is poor, so that the composite blockage removing technology is more and more commonly applied to the field, and the self-heating blockage removing technology is one of the technologies. The traditional chemical heat generation system adopts the technical principle that a nitrogenous oxidant and a nitrogenous reducing agent are mixed to perform chemical reaction under the action of a catalyst, a large amount of heat and gas are released, the generated heat and gas are utilized, the blockage of an oil well near-wellbore area caused by organic matters such as colloid, asphaltene and wax is relieved, an oil flow channel is dredged, and the productivity of the oil well is recovered. The conventional construction adopts a segmented plug type injection mode, and two reactants are mixed in the stratum. In actual operation, in the process of transporting and storing reactants, if the operation is improper or the storage is improper, the reaction risks to release heat, and certain safety hazards exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an oil field microcapsule non-acid self-heating blocking remover and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the oil field microcapsule non-acid self-heating blocking remover comprises a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B, wherein the mass ratio of the water-soluble microcapsule blocking remover KR-100A to the water-soluble microcapsule blocking remover KR-100B is as follows: 0.9-2.1: 1;
the water-soluble microcapsule blocking remover KR-100A is prepared from ammonium chloride, potassium chloride, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide;
the water-soluble microcapsule blocking remover KR-100B is prepared from sodium nitrite, sodium nitrate, EDTA-2NA salt, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide.
The preparation method of the water-soluble microcapsule blocking remover KR-100A comprises the following steps:
adding ammonium chloride and potassium chloride serving as capsule core materials into water to dissolve until the materials are saturated, adding the filtered saturated aqueous solution into a stainless steel reaction kettle, adding sulfuric acid to adjust the pH value to 2-6, heating the reaction kettle to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, uniformly stirring, adding dimethyl sulfoxide and solid paraffin, placing the mixture into a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain a water-soluble microcapsule blocking remover KR-100A;
the water-soluble microcapsule blocking remover KR-100A comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of the water, the ammonium chloride, the potassium chloride, the polyvinyl alcohol, the dimethyl sulfoxide and the solid paraffin is 1000:200-350: 100-300:10-50: 10-100.
The preparation method of the water-soluble microcapsule blocking remover KR-100B comprises the following steps:
adding sodium nitrite, sodium nitrate and EDTA-2NA salt which are capsule inner core materials into water to dissolve until saturation, adding the filtered saturated water solution into a stainless steel reaction kettle, heating to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, stirring until complete dissolution, adding dimethyl sulfoxide and solid paraffin, placing in a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain the water-soluble microcapsule blocking remover KR-100B;
the water-soluble microcapsule blocking remover KR-100B comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of water, sodium nitrite, sodium nitrate, EDTA-2NA salt, polyvinyl alcohol, dimethyl sulfoxide and solid paraffin is 1000: 400-.
The preparation method of the oil field microcapsule non-acid self-heating blocking remover specifically comprises the following steps:
uniformly mixing the water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B according to the mass ratio of 0.9-2.1:1 to obtain the oil field microcapsule non-acid self-heating blocking remover.
The application method of the oil field microcapsule non-acid self-heating blocking remover comprises the following specific steps:
the squeezing process and the Christmas tree are tested by using clear water without puncture and leakage, and squeezing construction is carried out after the squeezing process and the Christmas tree are qualified;
closing the blowout preventer, trying to squeeze the perforation section, and determining the water absorption capacity of an oil layer;
dispersing a mixture of a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B in an aqueous solution, and pumping the mixture to a target oil production layer by a positive extrusion pump, wherein the highest ground construction pressure is not more than 12 MPa;
closing the well for more than 24 h;
emptying, exhausting and decompressing, and starting to discharge the gas again after the gas is discharged;
the reverse circulation filters seawater to wash the perforation section;
and pulling out the flushing pipe column.
The invention has the beneficial effects that: the microcapsule non-acid self-heating blocking remover is wrapped by soluble high-molecular microcapsules, and under a specific condition, after the capsules are broken, the contents of the capsules can be mutually contacted to generate a chemical reaction to generate heat and inert gas, and the functions of permeation cleaning and chelating corrosion of the auxiliary agent are added, so that the oil field production well and rock pore channels of a near-well stratum are heated and dredged, organic and inorganic scale blocking is dissolved, cleaned and unblocked, the near-well oil layer pressure is improved, and the crude oil yield is improved. The invention has obvious indirect economic, social and environmental benefits.
Drawings
FIG. 1 is a schematic diagram of the deblocking mechanism of the microcapsule non-acid self-heating deblocking agent of the present invention;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the oil field microcapsule non-acid self-heating blocking remover comprises a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B, wherein the mass ratio of the water-soluble microcapsule blocking remover KR-100A to the water-soluble microcapsule blocking remover KR-100B is as follows: 0.9-2.1: 1;
the water-soluble microcapsule blocking remover KR-100A is prepared from ammonium chloride, potassium chloride, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide;
the water-soluble microcapsule blocking remover KR-100B is prepared from sodium nitrite, sodium nitrate, EDTA-2NA salt, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide.
The preparation method of the water-soluble microcapsule blocking remover KR-100A comprises the following steps:
adding ammonium chloride and potassium chloride serving as capsule core materials into water to dissolve until the materials are saturated, adding the filtered saturated aqueous solution into a stainless steel reaction kettle, adding sulfuric acid to adjust the pH value to 2-6, heating the reaction kettle to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, uniformly stirring, adding dimethyl sulfoxide and solid paraffin, placing the mixture into a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain a water-soluble microcapsule blocking remover KR-100A;
the water-soluble microcapsule blocking remover KR-100A comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of the water, the ammonium chloride, the potassium chloride, the polyvinyl alcohol, the dimethyl sulfoxide and the solid paraffin is 1000:200-350: 100-300:10-50: 10-100.
The preparation method of the water-soluble microcapsule blocking remover KR-100B comprises the following steps:
adding sodium nitrite, sodium nitrate and EDTA-2NA salt which are capsule inner core materials into water to dissolve until saturation, adding the filtered saturated water solution into a stainless steel reaction kettle, heating to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, stirring until complete dissolution, adding dimethyl sulfoxide and solid paraffin, placing in a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain the water-soluble microcapsule blocking remover KR-100B;
the water-soluble microcapsule blocking remover KR-100B comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of water, sodium nitrite, sodium nitrate, EDTA-2NA salt, polyvinyl alcohol, dimethyl sulfoxide and solid paraffin is 1000: 400-.
The preparation method of the oil field microcapsule non-acid self-heating blocking remover specifically comprises the following steps:
uniformly mixing the water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B according to the mass ratio of 0.9-2.1:1 to obtain the oil field microcapsule non-acid self-heating blocking remover.
The application method of the oil field microcapsule non-acid self-heating blocking remover comprises the following specific steps:
the squeezing process and the Christmas tree are tested by using clear water without puncture and leakage, and squeezing construction is carried out after the squeezing process and the Christmas tree are qualified;
closing the blowout preventer, trying to squeeze the perforation section, and determining the water absorption capacity of an oil layer;
dispersing a mixture of a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B in an aqueous solution, and pumping the mixture to a target oil production layer by a positive extrusion pump, wherein the highest ground construction pressure is not more than 12 MPa;
closing the well for more than 24 h;
emptying, exhausting and decompressing, and starting to discharge the gas again after the gas is discharged;
the reverse circulation filters seawater to wash the perforation section;
and pulling out the flushing pipe column.
The microcapsule technology is a technology of coating a core material by using a natural or synthetic polymer material to form a film so as to form micro particles, and generally has small particle size and certain strength and plasticity. The application of the material has the advantages that the material is an effective material curing technology, and the capsule core material can be wrapped by the capsule wall and isolated from the external environment, so that the property of the capsule core material is protected from being influenced, the storage stability of the product is improved, the field operation is simplified, and the potential safety hazard of the operation is avoided.
The invention provides a non-acid self-heating blockage removing agent for oil field microcapsules and a preparation method thereof, wherein solid paraffin and polyvinyl alcohol are adopted to carry out microcapsule wrapping on reactants, a field construction route of the non-acid self-heating blockage removing agent for the microcapsules is provided, the capsule core contents are ensured to break through the capsule wall under a proper condition, and under the initiation of an external catalyst, the reaction, heat release, gas generation and other auxiliary agents outside the capsule wall are generated to play roles in cleaning and blockage removal. The specific blockage removal mechanism is shown in fig. 1.
The microcapsule non-acid self-heating blocking remover is wrapped by soluble high-molecular microcapsules, slowly swells in water along with the change of temperature and pressure, water molecules enter a capsule core through a swollen high-molecular membrane to dissolve reactants in the capsule core, the dissolved contents diffuse out of the capsule and finally are completely broken under certain pressure, so that the effect of reaction after slow release is achieved, after the capsule is broken, the capsule contents can be in mutual contact to generate chemical reaction to generate heat and inert gas, the permeation cleaning and chelating corrosion effects of an auxiliary agent are added, the pore passages of rock of oil field production wells and near-well stratums are heated and dredged, the blockage of organic and inorganic scales is dissolved, cleaned and unblocked, the near-well oil layer pressure is improved, and the crude oil yield is improved. The invention has obvious indirect economic, social and environmental benefits.
The specific embodiment is as follows:
preparing a water-soluble microcapsule blocking remover KR-100A: adding 300 parts of ammonium chloride and 100 parts of potassium chloride serving as capsule core materials into 1000 parts of water, dissolving the mixture to saturation, filtering the solution, adding the saturated aqueous solution into a stainless steel reaction kettle, adding sulfuric acid to adjust the pH value to 2, heating the reaction kettle to 50 ℃, adding 200 parts of polyvinyl alcohol with the polymerization degree of 3000 and the alcoholysis degree of 80mo 1%, uniformly stirring the mixture, adding 40 parts of dimethyl sulfoxide and 10 parts of solid paraffin, placing the mixture into a high-speed stirrer, heating the mixture to 120 ℃, reacting the mixture for 2.5 hours, cooling the mixture to room temperature, filtering the mixture, washing the mixture with absolute ethyl alcohol, and drying the mixture to obtain the water-soluble microcapsule blocking remover KR-100A, wherein the particle size of the water-soluble microcapsule blocking remover is 0.1-0.9mm, the release rate is more than 60%, the effective content can reach 39.23%, the embedding rate is 86.77%, and the water-.
TABLE 1 Effect of paraffin wax on KR-100A sustained Release Rate
Preparing a water-soluble microcapsule blocking remover KR-100B: adding 500 parts of capsule inner core material sodium nitrite, 100 parts of sodium nitrate and 50 parts of EDTA-2NA salt into 1000 parts of water to dissolve until saturation, adding the saturated water solution into a stainless steel reaction kettle after filtering, heating to 50 ℃, adding 200 parts of polyvinyl alcohol with the polymerization degree of 5000 and the alcoholysis degree of 85mo 1%, stirring until complete dissolution, adding 40 parts of dimethyl sulfoxide and 15 parts of solid paraffin, placing the mixture into a high-speed stirrer, heating to 120 ℃, reacting for 3 hours, cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain the water-soluble microcapsule blocking remover KR-100B, wherein the particle size of the water-soluble microcapsule blocking remover is 0.3-1.0mm, the effective content can reach 43.38%, the embedding rate is 90.32%, and the water-soluble temperature of the microcapsule blocking remover KR-100B is 10-100 ℃.
TABLE 2 Effect of paraffin wax on KR-100B Slow Release Rate
The water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B slowly swell in water along with the change of temperature and pressure, water molecules enter the capsule core through the swelled polymer membrane to dissolve reactants in the capsule core, the dissolved contents diffuse and flow out of the capsule, and finally the contents are completely broken under certain pressure, so that the effect of reaction after slow release is achieved, and the self-heating reaction can be generated under the temperature effect of the bottom layer.
The slow release time of the water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B is controllable, the concentrations of the water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B are both 4 mol/L at different reaction temperatures, the total reaction volume is 500ml, the reaction boiling point time is counted from the time when the self-heating reaction temperature is more than or equal to 95 ℃, and the obtained thermodynamic data are as follows:
table 3: thermochemical reaction data
| Starting temperature (. degree.C.) | 11 | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
| Initiation time of reaction (min) | 120 | 59 | 30 | 25 | 15 | 10 | 3 | 1 |
| Time to boiling point (min) | / | 46 | 42 | 35 | 26 | 20 | 18 | 15 |
| Maintaining boiling point time (min) | / | 5 | 8 | 6 | 4 | 3 | 3 | 2 |
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.
Claims (7)
1. The oil field microcapsule non-acid self-heating blocking remover is characterized by comprising a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B, wherein the mass ratio of the water-soluble microcapsule blocking remover KR-100A to the water-soluble microcapsule blocking remover KR-100B is as follows: 0.9-2.1: 1;
the water-soluble microcapsule blocking remover KR-100A is prepared from ammonium chloride, potassium chloride, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide;
the water-soluble microcapsule blocking remover KR-100B is prepared from sodium nitrite, sodium nitrate, EDTA-2NA salt, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide.
2. The oilfield microcapsule non-acid self-heating deblocking agent of claim 1, wherein the preparation method of the water-soluble microcapsule deblocking agent KR-100A is as follows:
adding ammonium chloride and potassium chloride which are capsule core materials into water to dissolve until the materials are saturated, adding the filtered saturated water solution into a stainless steel reaction kettle, adding sulfuric acid to adjust the pH value to 2-6, heating the reaction kettle to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, uniformly stirring, adding dimethyl sulfoxide and solid paraffin, placing the mixture into a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain the water-soluble microcapsule blocking remover KR-100A.
3. The oilfield microcapsule non-acid self-heating blocking agent according to claim 2,
the water-soluble microcapsule blocking remover KR-100A comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of the water, the ammonium chloride, the potassium chloride, the polyvinyl alcohol, the dimethyl sulfoxide and the solid paraffin is 1000:200-350: 100-300:10-50: 10-100.
4. The oilfield microcapsule non-acid self-heating deblocking agent of claim 1, wherein the preparation method of the water-soluble microcapsule deblocking agent KR-100B is as follows:
adding sodium nitrite, sodium nitrate and EDTA-2NA salt as capsule inner core materials into water, dissolving until saturation, adding the filtered saturated water solution into a stainless steel reaction kettle, heating to 50 ℃, adding polyvinyl alcohol with the polymerization degree of 2000-8000 and the alcoholysis degree of 75-99mo 1%, stirring until complete dissolution, adding dimethyl sulfoxide and solid paraffin, placing into a high-speed stirrer, heating to 120 ℃, reacting for 2-4 hours, finally cooling to room temperature, filtering, washing with absolute ethyl alcohol, and drying to obtain the water-soluble microcapsule blocking remover KR-100B.
5. The oilfield microcapsule non-acid self-heating blocking agent according to claim 4,
the water-soluble microcapsule blocking remover KR-100B comprises the following raw materials in parts by weight in the preparation process: the mass portion ratio of water, sodium nitrite, sodium nitrate, EDTA-2NA salt, polyvinyl alcohol, dimethyl sulfoxide and solid paraffin is 1000: 400-.
6. The preparation method of the oilfield microcapsule non-acid self-heating deblocking agent according to any one of claims 1 to 5, characterized by comprising the following steps:
uniformly mixing the water-soluble microcapsule blocking remover KR-100A and the water-soluble microcapsule blocking remover KR-100B according to the mass ratio of 0.9-2.1:1 to obtain the oil field microcapsule non-acid self-heating blocking remover.
7. The use method of the oilfield microcapsule non-acid self-heating deblocking agent according to claim 6, characterized by comprising the following steps:
the squeezing process and the Christmas tree are tested by using clear water without puncture and leakage, and squeezing construction is carried out after the squeezing process and the Christmas tree are qualified;
closing the blowout preventer, trying to squeeze the perforation section, and determining the water absorption capacity of an oil layer;
dispersing a mixture of a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B in an aqueous solution, and pumping the mixture to a target oil production layer by a positive extrusion pump, wherein the highest ground construction pressure is not more than 12 MPa;
closing the well for more than 24 h;
emptying, exhausting and decompressing, and starting to discharge the gas again after the gas is discharged;
the reverse circulation filters seawater to wash the perforation section;
and pulling out the flushing pipe column.
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| US7968117B1 (en) * | 1994-12-02 | 2011-06-28 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Externally triggered microcapsules |
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| US20040224855A1 (en) * | 2002-11-08 | 2004-11-11 | Zhanyuan Hao | Method for preparing a chlorine dioxide block-removing agent in oil wells |
| US20080066784A1 (en) * | 2006-09-14 | 2008-03-20 | Halliburton Energy Services, Inc. | Methods and compositions for thermally treating a conduit used for hydrocarbon production or transmission to help remove paraffin wax buildup |
| CN102250603A (en) * | 2011-05-06 | 2011-11-23 | 河北科技大学 | Separated injection oil well composite blocking remover and injection method thereof |
| CN106190075A (en) * | 2015-04-30 | 2016-12-07 | 中国海洋石油总公司 | A kind of combined oxidation de-plugging agent |
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| 吴金桥等: "微胶囊包裹化学生热压裂液体系及其工艺技术研究", 《石油学报》 * |
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