CN113445944B - Pollution-free sand prevention and yield increase method for oil well - Google Patents
Pollution-free sand prevention and yield increase method for oil well Download PDFInfo
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- CN113445944B CN113445944B CN202110710700.XA CN202110710700A CN113445944B CN 113445944 B CN113445944 B CN 113445944B CN 202110710700 A CN202110710700 A CN 202110710700A CN 113445944 B CN113445944 B CN 113445944B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a pollution-free sand prevention yield increasing method for an oil well, which is realized by construction preparation, sand prevention construction operation and recovery production construction operation in sequence; the construction preparation steps sequentially comprise flushing and killing, pulling out a raw production string, putting in a sand washing string, determining that a sleeve is not damaged, dredging the well, scraping and sealing other stratum; the sand control construction operation comprises the steps of firstly preparing a pre-solution, a treatment solution and a displacement solution by adopting a sand control agent compounded by a sand electric potential modifier and a clay stabilizer; then forward extruding the pre-liquid, the forward extruding treatment liquid and the forward extruding displacement liquid in sequence downwards, and closing the well for 48 hours to lift out the sand injection string; the production construction operation comprises the steps of extracting an isolated sand control pipe string, completing a well and recovering normal production operation; the pollution-free sand prevention and yield increase method for the oil well realizes pollution-free sand fixation of the reservoir under the premise of ensuring the permeability of the reservoir by consolidating sand grains through coulomb force among sand grains, realizes sand prevention and yield increase, has no pollution hidden trouble and has longer effective period.
Description
Technical Field
The invention relates to the technical field of oilfield workover, in particular to a pollution-free sand prevention and yield increase method for an oil well.
Background
Part of the oil wells cause loose and broken reservoir rock due to poor stratum cementation degree and overlarge exploitation strength, and the stratum sand production is initiated. Formation sand production may cause: (1) sand buried oil layer production reduction (2) sand friction downhole equipment leading to life reduction (3) sand buried pipe column leading to oil well overhaul (4) stratum defect collapse oil well rejection). According to the sand control technology adopted in the oil extraction industry at present, there are two types of mechanical sand control and chemical sand control; the mechanical sand prevention method is simple, the construction cost is low, but formation sand production cannot be prevented; the chemically reconstructed well wall sand prevention can be used for various reservoirs, has good effect on fine powder sand, but has high cost, short validity period and obvious permeability reduction; the reconstructed well wall chemical sand prevention is to solidify the sand production layer position by using the adhesive, so that the sand production can be fundamentally treated, and the method is a main research direction of the existing sand prevention technology, but the method has great influence on permeability after sand prevention and can pollute the stratum.
Disclosure of Invention
The invention aims to provide a pollution-free sand prevention and yield increase method for an oil well aiming at sand prevention, sand control and yield increase of a sand production oil well.
The technical scheme of the invention is as follows:
the pollution-free sand prevention and yield increase method for the oil well comprises the following specific construction steps:
step S1, construction preparation:
s101, preparing well flushing liquid, heating to 70-75 ℃, and flushing the well in a backwashing mode of entering from the annular space of the oil sleeve and returning from the oil pipe; after the well flushing is finished, preparing calcium chloride well-killing liquid according to the stratum pressure to finish well-killing;
s102, a primary production tubular column is started from the inside of the well, and the primary production tubular column comprises a sucker rod tubular column and an oil pipe tubular column;
s103, putting into the sand washing pipe string, and starting out the sand washing pipe string after sand washing reaches the geological and engineering design depth;
s104, utilizing a tracer leakage finding technology to ensure that the sleeve is free of damage:
s105, connecting a well logging gauge with an oil pipe to form a well logging tubular column, and logging into the well to perform well logging; when the pigging well exceeds the construction well section, adopting normal-temperature calcium chloride well-killing liquid used in the step S101 with 2-3 times of the well shaft volume as well-flushing liquid, and flushing the well in a positive well-flushing mode of entering from an oil pipe and returning from an oil sleeve annulus;
s106, connecting a scraper with an oil pipe to form a scraping pipe column, putting the scraping pipe column into a well, constructing the well Duan Guaxiao-15 times, and then adopting normal-temperature well-killing liquid used in the step S101 with 2-3 times of shaft volume to wash the well in a positive well-flushing mode of entering from an oil sleeve annulus and returning the oil pipe;
s107, assembling the isolation sand control pipe string, and putting the isolation sand control pipe string into a well, and independently isolating a production layer with serious sand production so as to perform sand control construction;
s2, sand prevention construction operation: firstly, preparing a pre-solution, a treatment solution and a displacement solution by adopting the sand control agent in the step S201; then forward extruding the front liquid well for 3-7 m 3 40-80 m of forward extrusion treatment fluid 3 Positive extrusion displacement fluid 4-8 m 3 Closing the well for 48 hours; wherein, the highest pumping pressure is less than or equal to 30.0MPa, and the highest discharge capacity is less than or equal to 600L/min; after the construction is completed, the sand injection prevention pipe column is started, and the sand prevention construction is completed;
s3, production construction operation: and (3) unpacking the packer, taking out the isolated sand control pipe string, and restoring normal production operation after the well completion is completed by putting the packer into a pipe string according to engineering design.
Further, in step S101, the well-flushing fluid is prepared by adding 1wt.% HRV-2 viscosity reducer into the treated oilfield deoiling produced water, and mixing uniformly; the dosage is 50-60 m 3 。
Further, after step S105 and step S106, the used states of the drift size gauge and the scraper are observed to determine whether the casing meets the requirement of the next construction.
Further, compatibility test is carried out on the sand control agent before sand control construction operation in the step S2, and the steps are as follows: firstly, taking 100mL of well control fluid in a well, fully and uniformly mixing the well control fluid with 100mL of sand control agent aqueous solution in a plastic or glass container with the volume of 300-500 mL, standing for 15min at normal temperature, and observing the reaction condition; if the sand control agent has no reaction coagulation or precipitation phenomenon after standing for 15min, the sand control agent is proved to meet the compatibility requirement.
Further, in step S2, the sand control agent is compounded of a sand electric potential modifier and a clay anti-swelling agent.
Further, in the step S2, the pre-liquid is prepared by adding 1 weight part of sand control agent and 0.2 weight part of swelling prevention agent into every 100 weight parts of clear water and mixing; the treatment fluid is prepared by adding 5 weight parts of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing; the displacement liquid is prepared by adding 1 weight part of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing.
Further, in the normal production operation process in the step S3, the liquid collection intensity is controlled to be less than or equal to 1.2m in the daily liquid collection amount corresponding to the thickness of each production layer 3 。
Compared with the prior art, the pollution-free sand control and yield increasing method for the oil well changes the traditional sand control mechanism, does not depend on a binder, and depends on coulomb force among sand grains to solidify sand grains, so that pollution-free sand fixation for a reservoir is realized on the premise of ensuring the permeability of the reservoir, further the sand control and yield increasing are realized, and no excessive sand control agent is required to be washed out after the sand control operation, so that the method is simple in construction, free of pollution hidden danger and long in effective period.
Detailed Description
The invention will be further illustrated with reference to the following specific examples, which are in no way limiting. In the following examples, commercial products were used for each device or chemical used in each working process.
Example 1
The sand prevention and yield increase method for the oil well is used for carrying out yield increase construction on Zhao 57-43X wells (the outer diameter of the well casing is 139.7 mm). The main problem of the well is that the sand is produced seriously in the production layer, so that the well cannot be produced normally; by using the original water shutoff construction method, the one-time water shutoff success rate is low due to the reverse spitting of the damaged position; based on the method, the concrete construction steps of the sand prevention and yield increase method for the oil well are as follows:
step S1, construction preparation is carried out by the following steps in sequence:
s101, well flushing and well killing operation:
(1) Flushing operation: taking treated oil field deoiling produced water 50-60 m 3 Adding 1wt.% of HRV-2 viscosity reducer into the mixture, stirring and mixing the mixture uniformly to prepare well-flushing liquid; heating the well-flushing liquid to 70-75 DEG CFlushing the well in a backwashing mode of entering from the annular space of the oil sleeve and returning from the oil pipe;
the pumping pressure of the well-flushing pump truck is controlled to be less than or equal to 15.0MPa, the discharge capacity is gradually increased from 0L/min, and the maximum discharge capacity is controlled to be less than or equal to 300L/min based on the outer diameter of the sleeve of 139.7 mm;
HRV-2 viscosity reducer is produced by Xin Shutong chemical company, inc; yang Fumin et al published in 1996, "development and evaluation of HRV-2 viscosity reducer for heavy oil" on volume 18, phase 3 of Petroleum drilling Process "describe its performance in detail;
(2) Well killing operation: after the well flushing operation is finished, preparing a calcium chloride well killing hydraulic well according to the stratum pressure;
s102, a primary production tubular column is started from the inside of the well, and the primary production tubular column comprises a sucker rod tubular column and an oil pipe tubular column;
s103, sand washing operation: a sand washing pipe string is put in, sand washing is carried out until the geological and engineering design depth is reached, and the sand washing pipe string is started; specifically, the sand washing pipe column consists of a nib with the diameter of 73mm and an externally-thickened oil pipe with the diameter of 73mm connected to the top end of the nib, and the length of the sand washing pipe column meets the condition that the bottom end of the nib reaches the sand surface position;
s104, tracer leak finding:
determining the non-damage position of the sleeve by using a tracer leakage finding technology; the tracer leak finding method is the prior art, and is written in Tan Tingdong and the like, and is described in detail in application of logging information in oil and gas field development published by oil industry publishers in 1991; if the sleeve is damaged, plugging the damaged position, and performing subsequent steps after the pressure test is qualified;
s105, well flushing:
the top end of the drift diameter gauge with the outer diameter of 118mm is connected with a thickened oil pipe with the diameter of 73mm in a threaded manner to form a drift diameter pipe column, and drift diameter construction is carried out; when the successful open well exceeds the construction well section, adopting normal-temperature calcium chloride well control liquid used in the step S101 with 2-3 times of the well volume as well flushing liquid, and flushing the well in a positive well flushing mode of entering from an oil pipe and returning from an oil sleeve annulus; after well flushing is completed, a well-dredging pipe column is started, and well-dredging gauge conditions are checked to judge whether the casing meets the requirement of next construction; in this step, the specific construction of the through-well is well known to those skilled in the art and will not be described in detail herein.
S106, scraping a flushing well:
the top end of the GX-140T type scraper is connected with a thickened oil pipe with the diameter of 73mm in a threaded manner to form a scraping pipe column, and scraping construction is carried out; in the scraping construction process, a scraping tubular column is adopted to need to construct a well Duan Guaxiao-15 times, and then normal-temperature well killing liquid used in the step S101 with 2-3 times of shaft volume is adopted to wash the well in a positive well washing mode of entering from an oil sleeve annulus and returning from an oil pipe; after well flushing is completed, a scraping pipe column is lifted out, and the abrasion condition of a scraper is checked to judge whether the sleeve meets the requirement of the next construction;
the GX-140T type scraper is a commercial common well repairing tool for oil fields, and the performance and the using method of the model scraper are recorded in detail in a 'cold oil extraction method at the side part of the oil reservoir structure of North China oil field' published in the oil drilling and extraction technology of the 2 nd phase of the 39 rd volume of 3 rd month in 2017; in addition, in this step, since a specific construction method of the shaved well is well known to those skilled in the art, a detailed description thereof will be omitted.
S107, isolating the sand production layer from other production layers:
the assembly isolation sand prevention pipe string is specifically composed of an oil pipe hanger, an externally thickened oil pipe with the diameter of 73mm, a variable buckle, a flat oil pipe nipple with the diameter of 73mm, a Y211-114 packer, an externally thickened oil pipe with the diameter of 73mm and a bell mouth which are sequentially connected from top to bottom; during operation, a section of lifting nipple with the length of 1.5m and the diameter of 73mm is connected with the top end of the oil pipe hanger in a threaded manner, oil well operation equipment is adopted to lift up and isolate sand prevention pipe strings for 1.4m, then the sand prevention pipe strings are slowly lowered down into the well, the packer is set by pressurizing for 70KN, meanwhile, the oil pipe hanger is set, the top jackscrew ensures that the setting is qualified, and the christmas tree with the bearing capacity of not less than 35MPa is installed;
the specific setting construction method of the packer is a technology well known to those skilled in the art, while the specific construction method of qualified setting of the tubing hanger and the overhead jackscrew is described in detail in the "wellhead integrity technology" published in the "unconventional oil and gas" of the 2 nd volume of 2015, the 6 th phase, and thus is a method well known to those skilled in the art, and is not described in detail herein.
S2, sand prevention construction operation:
s201, compatibility test:
taking 100mL of well killing liquid in a well, fully and uniformly mixing the well killing liquid with 100mL of sand control agent in a plastic or glass container with the volume of 300-500 mL, standing for 15min at normal temperature, and observing the reaction condition; if the sand control agent has no reaction coagulation or precipitation phenomenon after standing for 15min, the sand control agent is proved to meet the compatibility requirement; wherein, the sand control agent is prepared by adding 1 weight part of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing; specifically, the sand control agent adopts CF-1 sand grain potential modifier produced by Shanghai Longjun science and technology Co., ltd. And the anti-swelling agent adopts quaternary ammonium salt-II clay anti-swelling agent produced by Zhejiang Kent catalytic materials Co., ltd;
s202, injecting a sand control agent:
firstly, preparing a pre-solution, a treatment solution and a displacement solution by adopting the sand control agent in the step S201; specifically, the pre-liquid is prepared by adding 1 part by weight of sand control agent and 0.2 part by weight of expansion control agent into every 100 parts by weight of clear water and mixing; the treatment fluid is prepared by adding 5 weight parts of sand control agent and 0.2 weight part of swelling prevention agent into every 100 weight parts of clear water and mixing; the displacement liquid is prepared by adding 1 weight part of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing; then pumping pressure of 3MPa and 0.2m are sequentially carried out downhole 3 Displacement forward extrusion front liquid well 5m per min 3 Pumping pressure of 10MPa, 0.5m 3 Displacement positive extrusion treatment liquid of/min 60m 3 Pumping pressure of 10MPa, 0.6m 3 Displacement positive displacement liquid 6m per min 3 Then closing the well for 48 hours; the preparation method and injection construction method of the sand control agent are well known to those skilled in the art, and thus are not described in detail herein.
S203, after the construction of the step S202 is completed, the sand injection pipe column is started, and the sand prevention construction is completed.
S3, production and construction operation: slowly lifting the string of sand control tubes 1.4m to unseal the packer, and lifting the string of sand control tubes;after the well is completed by the combination of the lower pipe string according to engineering design, production is recovered; wherein, in the production process, the liquid collection intensity is controlled to be 1.2m corresponding to the daily liquid collection amount of each meter of the thickness of the production layer 3 To prolong the effective period of sand prevention.
Through the sand prevention and yield increase construction process of the oil well, the sand prevention and yield increase effect of the Zhao 57-43X well is good, the daily yield before construction is zero, and the daily yield of crude oil after sand prevention construction is 6.9 tons.
Example 2
The sand prevention and yield increase method of the oil well of the embodiment 1 is simultaneously applied to sand prevention construction of an oil well with more serious sand production of six other producing layers on site; through the construction, the sand prevention success rate of the oil well is 100%, and the average daily oil increment is 5.2 tons.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The pollution-free sand prevention and yield increase method for the oil well is characterized by comprising the following specific construction steps:
step S1, construction preparation:
s101, preparing well flushing liquid, heating to 70-75 ℃, and flushing the well in a well flushing mode of entering from the annular space of the oil sleeve and returning from the oil pipe; after the well flushing is finished, preparing calcium chloride well-killing liquid according to the stratum pressure to finish well-killing;
s102, a primary production tubular column is started from the inside of the well, and the primary production tubular column comprises a sucker rod tubular column and an oil pipe tubular column;
s103, putting into the sand washing pipe string, and starting out the sand washing pipe string after sand washing reaches the geological and engineering design depth;
s104, utilizing a tracer leakage finding technology to ensure that the sleeve is free of damage:
s105, connecting a well logging gauge with an oil pipe to form a well logging tubular column, and logging into the well to perform well logging; when the open well exceeds the construction well section, adopting normal-temperature calcium chloride well control liquid used in the step S101 with 2-3 times of the well volume as well flushing liquid, and flushing the well in a positive well flushing mode of entering from an oil pipe and returning from an oil sleeve annulus;
s106, connecting a scraper and an oil pipe to form a scraping pipe column, putting the scraping pipe column into a well, constructing the well Duan Guaxiao to 15 times, and then adopting normal-temperature well-killing liquid used in the step S101 with 2-3 times of shaft volume to wash the well in a positive well-flushing mode of entering from an oil sleeve annulus and returning the oil pipe;
s107, assembling the isolation sand control pipe string, and putting the isolation sand control pipe string into a well, and independently isolating a production layer with serious sand production so as to perform sand control construction;
s2, sand prevention construction operation: firstly, preparing a pre-solution, a treatment solution and a displacement solution by adopting the sand control agent in the step S201; then, forward extruding the front liquid well for 3-7 m in sequence towards the underground 3 40-80 m of forward extrusion treatment liquid 3 Positive extrusion displacement fluid for 4-8 m 3 Closing the well for 48 hours; wherein, the highest pump pressure limit is 30.0MPa, and the highest discharge capacity is 600L/min; after the construction is completed, the sand injection prevention pipe column is started, and the sand prevention construction is completed; wherein the sand control agent is compounded by sand electric potential modifier and clay anti-swelling agent; the pre-liquid is prepared by adding 1 weight part of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing; the treatment fluid is prepared by adding 5 weight parts of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing; the displacement liquid is prepared by adding 1 weight part of sand control agent and 0.2 weight part of expansion control agent into every 100 weight parts of clear water and mixing;
s3, production construction operation: and (3) unpacking the packer, taking out the isolated sand control pipe string, and restoring normal production operation after the well completion is completed by putting the packer into a pipe string according to engineering design.
2. The pollution-free sand control and yield increasing method of an oil well according to claim 1, wherein in the step S101, the well washing liquid is prepared by adding 1wt.% of HRV-2 viscosity reducer into the treated oil field deoiling produced water and uniformly mixing; the dosage is 50-60 m 3 。
3. The pollution-free sand control stimulation method of oil well of claim 1, wherein after step S105 and step S106, the condition after use of the gauge block and the scraper is observed to determine whether the casing meets the requirement of the next construction.
4. The pollution-free sand control and yield increasing method for oil well according to claim 1, wherein compatibility test is carried out on sand control agent before sand control construction operation in step S2, and the steps are as follows: firstly, taking 100mL of well control fluid in a well, fully and uniformly mixing the well control fluid with 100mL of sand control agent aqueous solution in a plastic or glass container with the volume of 300-500 mL, standing for 15min at normal temperature, and observing the reaction condition; if the sand control agent has no reaction coagulation or precipitation phenomenon after standing for 15min, the sand control agent is proved to meet the compatibility requirement.
5. The pollution-free sand control and yield increasing method for oil well according to claim 1, wherein in the normal production operation in step S3, the liquid production intensity is controlled to be less than or equal to 1.2m per meter of the daily liquid production amount corresponding to the thickness of the producing layer 3 。
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| CN1046988C (en) * | 1995-10-18 | 1999-12-01 | 辽河石油勘探局钻采工艺研究院 | Artificial well-wall sand-proof technology for steam-injection thermal-recovery well of viscous crude oil |
| CN1472418A (en) * | 2003-06-26 | 2004-02-04 | 辽宁天意实业股份有限公司 | High-temperature high-pressure artifical sandproof well wall and construction technology thereof |
| US8322420B2 (en) * | 2008-10-20 | 2012-12-04 | Schlumberger Technology Corporation | Toe-to-heel gravel packing methods |
| GB0911672D0 (en) * | 2009-07-06 | 2009-08-12 | Tunget Bruce A | Through tubing cable rotary system |
| CN201671623U (en) * | 2010-05-18 | 2010-12-15 | 中国石油天然气股份有限公司 | Leakage-finding water exclusion production string for horizontal wells |
| CN102330545B (en) * | 2011-10-17 | 2014-02-05 | 中国石油天然气股份有限公司 | Oil well sand prevention method for heavy oil reservoir |
| CN103013485B (en) * | 2012-12-12 | 2015-04-08 | 中国石油天然气股份有限公司 | Modified resin sand consolidation agent as well as preparation method and application thereof |
| CN103899286B (en) * | 2012-12-28 | 2016-06-08 | 中国石油天然气股份有限公司 | A kind of method of oil reservoir structure edge heavy oil cold flow production |
| CN106677729B (en) * | 2016-07-13 | 2019-07-12 | 克拉玛依市泰英科技有限责任公司 | Mud solid-liquid recycles integrated treating device system |
| CN109869121B (en) * | 2019-03-18 | 2021-02-19 | 中国石油化工股份有限公司 | Mechanical sand prevention process for small cased well |
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