CN107987812A - A kind of workover fluid and preparation method thereof - Google Patents
A kind of workover fluid and preparation method thereof Download PDFInfo
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- CN107987812A CN107987812A CN201711133943.1A CN201711133943A CN107987812A CN 107987812 A CN107987812 A CN 107987812A CN 201711133943 A CN201711133943 A CN 201711133943A CN 107987812 A CN107987812 A CN 107987812A
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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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/518—Foams
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Abstract
The invention discloses a kind of workover fluid and preparation method thereof, the workover fluid includes the component of following quality proportioning：0.3~0.7 part of 90~100 parts of clear water, 1.0~1.6 parts of starch-based thickener, 0.4~0.8 part of curdlan, 0.2~0.6 part of propylene glycol alginate, 0.2~0.4 part of lauryl sodium sulfate, 0.2~0.6 part of sodium carboxymethylcellulose, 0.3~0.7 part of thiocarbamide, 0.8~1.2 part of potassium chloride and sodium formate.The problems such as workover fluid has that density is low, foam stabilization, lost circulation prevention effect, and it is poor to solve conventional workover fluid stability, heat and salinity tolerance energy force difference, discharge opeing caused by the low pressure gas-bearing formation low to production capacity, leakage is big is difficult, and formation damage is serious, and production capacity is difficult to recover.
Description
Technical field
The invention belongs to petroleum drilling technology field, specifically, is related to a kind of workover fluid and preparation method thereof.
Background technology
At present, each elephant has been enter into mid-later development phase, and most of oil well, oil reservoir energy deficit are serious, absorption well, leakage
Lose layer accordingly to increase, pressure coefficient dramatic decrease.When there is abnormal or halt production in oil/gas well, it is necessary to carry out well workover, replace or excellent
Change flow string, oil/gas well is resumed production.Low pressure well repaiies operation frequently with oil base workover fluid and foam workover fluid at present.Oil base
Although workover fluid density is low, oil layer protection effect is good, of high cost, and environmental pollution is serious.Usual foam workover fluid is in well
The leakage of liquid is prevented without enough stability down, and when oil pipe moves, its liquid film repair ability is weak, in high temperature height
In salinity water can dehydration shrinkage quickly, temperature resistance energy force difference.Injured to reduce conventional workover fluid caused by gas-bearing formation, exploitation is new
Type foam workover fluid is imperative.In addition, domestic largely using aqua type workover fluid, it is follow-on that it mainly includes mud
Workover fluid, polymeric solid phase brine workover fluid and solid free brine workover fluid three classes.Wherein the follow-on workover fluid of mud because
Solid concentration is high, relatively large to formation damage, in recent years using less.The advantages of polymeric solid phase brine workover fluid is to enter
The leak-off on stratum is few, and band grittiness can be good, but has hole, the heterogeneous low porosity and low permeability stratum of construction, solid phase wound again to existing crack
Evil is big, and water blocking damage is serious, it is not easy to the row of returning.It is therefore desirable to work out a kind of stable strong stronger workover fluid, have stronger
Temperature resistance anti-pressure ability, and solid-phase component be not present in itself, does not block the risk of downhole tool, but also with preferably
Return and mediate stifled ability and oil layer protection effect.
The content of the invention
The purpose of the present invention is：A kind of workover fluid is provided, which has that density is low, foam stabilization, lost circulation prevention effect,
It is poor can to solve conventional workover fluid stability, heat and salinity tolerance energy force difference, row caused by the low pressure gas-bearing formation low to production capacity, leakage is big
The problems such as liquid is difficult, and formation damage is serious, and production capacity is difficult to recover.
Second object of the present invention is to provide a kind of preparation method of workover fluid.
In order to solve the above technical problems, the technical scheme is that：
A kind of workover fluid, includes the component of following quality proportioning：
Wherein, starch-based thickener is steady as mud during oil well operation as thickener, stabilizer, adhesive
Determine agent, water-retaining agent, play reduction fluid loss, improve the effect of the coagulation stability of clay particle, increase the stability of workover fluid；
What propylene glycol alginate played the role of is thickening, stabilization, emulsifying agent；Lauryl sodium sulfate is used as foaming agent；Carboxylic
Sodium carboxymethylcellulose pyce is mud stability, water-retaining agent；Thiocarbamide makees antioxidant；For potassium chloride as expansion-resisting agent, sodium formate is anti-corrosion
Agent, heavy weight additive and inhibitor；
Curdlan dispersion liquid forms the minuent of thermal reversibility from when being heated to be cooled back to below 40 DEG C after 65 DEG C for 55 DEG C
Glue.When minuent glue is heated to 60 DEG C, with regard to original scattered liquid status can be returned to.It is heated to when curdlan dispersion liquid
At 80 DEG C, the height glue of solid heat irreversible is formed.It is applied in oil extraction, this characteristic determines it in thickening, increasing
Thick, salt resistance and contamination resistance several respects are superior more than other polymer.To accelerating bit speed, preventing oil well from caving in, protecting
Oil gas field, prevent blowout and increase substantially tar productivity etc. have obvious effect.Curdlan is used for workover fluid, can be obvious
Improve the heat and salinity tolerance ability of workover fluid.
Preferably, the workover fluid includes the component of following quality proportioning：
Preferably, the starch-based thickener includes the double starch of acetylation diacid, the double starch of phosphate, acid treatment shallow lake
Powder, oxidized starch, oxidation hydroxypropul starch, the one or more of sodium carboxymethyl starch.
A kind of preparation method of workover fluid, comprises the following steps：
A. the clear water that mass ratio is 90~100 parts is added in a reservoir, then adds the shallow lake that mass ratio is 1.0~1.6 parts
Powder base thickener, is stirred 5~8 minutes；
B. the curdlan that mass ratio is 0.4~0.8 part and stirring 10~15 are slowly added in the solution obtained by step a
Minute, 65 DEG C~68 DEG C are to slowly warm up in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing to stir
Solution is cooled to room temperature during mixing；
C. the propylene glycol alginate, quality that mass ratio is 0.2~0.6 part are sequentially added in the solution obtained by step b
Than the sodium carboxymethylcellulose that the lauryl sodium sulfate for 0.2~0.4 part and mass ratio are 0.2~0.6 part, stirring 10~15
Minute；Finally sequentially add the potassium chloride and mass ratio that thiocarbamide, mass ratio that mass ratio is 0.3~0.7 part are 0.8~1.2 part
For 0.3~0.7 part of sodium formate, stir 4~8 minutes, you can allot finished product.
Preferably, the rotating speed stirred in the step a is 6000~8000rpm；That is stirred in step b and step c turns
Speed is 4000~6000rpm.
By adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, workover fluid of the present invention has low leak-off, low clay swell rate, low corrosion, water blocking damage is small, density can adjust, match somebody with somebody
System is convenient, will not injure stratum and can efficiently solve the low pressure gas-bearing formation institute band that conventional workover fluid is low to production capacity, leakage is big
The problems such as discharge opeing come is difficult, and formation damage is serious, and production capacity is difficult to recover；
2nd, workover fluid leak stopping capability of the present invention is strong and is free of solid-phase component, and there is no the risk for blocking downhole tool, foam
Stablize, foam also has certain intensity and toughness in itself, has deformability, compressibility, being capable of the various leakages of Self Matching
Passage, solves the problems, such as that particle diverting agent matches hardly possible with formation heterogeneity, and it is existing scarce in use to compensate for diverting agent
Fall into；
3rd, workover fluid of the present invention has preferable oil layer protection performance, and the good row's of returning ability, is finished easy to operation
Liquid in the row's of returning well in time afterwards；
4th, curdlan is used for workover fluid by the present invention, can significantly improve the heat and salinity tolerance ability of workover fluid
5th, raw material sources of the present invention are extensive, and cost is low, and it is convenient to prepare, and construction is easy.
In short, the present invention has, density is low, foam stabilization, lost circulation prevention effect, and it is poor to solve conventional workover fluid stability,
Heat and salinity tolerance energy force difference, discharge opeing caused by the low pressure gas-bearing formation low to production capacity, leakage is big is difficult, and formation damage is serious, and production capacity is difficult
The problems such as to recover.
Embodiment
With reference to embodiment, the present invention is further explained.
Raw material sources：It is that in the market can sell product, wherein each quality requirements of raw materials is：Curdlan is chemistry
It is pure；Thiocarbamide is pure to analyze；Other raw material are technical pure.
The density of workover fluid is to determine the key factor of its performance, and the height of density directly affects the size of filter loss, most
Well workover success is determined eventually, is estimated using the density of factor of influence maximum and is used as Performance evaluation criterion.
Embodiment oneOne of preparation of workover fluid：
A. the clear water that mass ratio is 90 parts is added in a reservoir, then adds the sodium carboxymethyl starch that mass ratio is 1.6 parts,
And stirred 8 minutes with the rotating speed of 8000rpm；
B. the curdlan that mass ratio is 0.8 part is slowly added in the solution obtained by step a and with the rotating speed of 8000rpm
Stir 15 minutes, be to slowly warm up to 68 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing to stir
Solution is cooled to room temperature during mixing；
C. propylene glycol alginate, mass ratio that mass ratio is 0.6 part are sequentially added in the solution obtained by step b is
0.2 part of lauryl sodium sulfate and mass ratio is 0.6 part of sodium carboxymethylcellulose, and stirs 15 with the rotating speed of 6000rpm
Minute；Finally sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.2 parts that mass ratio is 0.3 part and the first that mass ratio is 0.7 part
Sour sodium, and stirred 8 minutes with the rotating speed of 6000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.756g/cm3, apparent viscosity is：81.3mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.696g/cm3, apparent viscosity is：74.1mPas, density become
Rate is：- 8.80%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment twoThe two of the preparation of workover fluid
A. the clear water that mass ratio is 100 parts is added in a reservoir, is then added the oxidation hydroxypropyl that mass ratio is 1.0 parts and is formed sediment
Powder, and stirred 5 minutes with the rotating speed of 8000rpm；
B. the curdlan that mass ratio is 0.4 is slowly added in the solution obtained by step a, and with the rotating speed of 6000rpm
Stir 10 minutes, be to slowly warm up to 65 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing to stir
Solution is cooled to room temperature during mixing；
C. propylene glycol alginate, mass ratio that mass ratio is 0.2 part are sequentially added in the solution obtained by step b is
0.4 part of lauryl sodium sulfate and mass ratio is 0.2 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 4000rpm
Minute；Finally sequentially add thiocarbamide, the potassium chloride that mass ratio is 0.8 part that mass ratio is 0.7 part and the first that mass ratio is 0.3 part
Sour sodium, and stirred 4 minutes with the rotating speed of 4000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.763g/cm3, apparent viscosity is：83.7mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.698g/cm3, apparent viscosity is：74.4mPas, density become
Rate is：- 8.52%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment threeThe three of the preparation of workover fluid
A. the clear water that mass ratio is 95 parts is added in a reservoir, and it is double then to add the acetylation diacid that mass ratio is 1.3 parts
Starch, and stirred 7 minutes with the rotating speed of 7000rpm；
B. the curdlan that mass ratio is 0.6 part is slowly added in the solution obtained by step a, and is turned with 7000rpm
Speed stirs 13 minutes, is to slowly warm up to 66 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing
Solution is cooled to room temperature in whipping process；
C. propylene glycol alginate, mass ratio that mass ratio is 0.4 part are sequentially added in the solution obtained by step b is
0.3 part of lauryl sodium sulfate and mass ratio is 0.3 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 5000rpm
~15 minutes；It is 0.5 part finally to sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.0 parts and mass ratio that mass ratio is 0.5 part
Sodium formate, and stirred 6 minutes with the rotating speed of 5000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.771g/cm3, apparent viscosity is：83.8mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.709g/cm3, apparent viscosity is：74.4mPas, density become
Rate is：- 7.91%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Example IVThe four of the preparation of workover fluid
A. the clear water that mass ratio is 95 parts is added in a reservoir, then adds the double starch of phosphate that mass ratio is 1.3 parts,
And stirred 7 minutes with the rotating speed of 7000rpm；
B. the curdlan that mass ratio is 0.6 part is slowly added in the solution obtained by step a, and is turned with 7000rpm
Speed stirs 13 minutes, is to slowly warm up to 66 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing
Solution is cooled to room temperature in whipping process；
C. propylene glycol alginate, mass ratio that mass ratio is 0.4 part are sequentially added in the solution obtained by step b is
0.3 part of lauryl sodium sulfate and mass ratio is 0.3 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 5000rpm
~15 minutes；It is 0.5 part finally to sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.0 parts and mass ratio that mass ratio is 0.5 part
Sodium formate, and stirred 6 minutes with the rotating speed of 5000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.735g/cm3, apparent viscosity is：80.2mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.662g/cm3, apparent viscosity is：71.7mPas, density become
Rate is：- 9.93%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment fiveThe five of the preparation of workover fluid
A. it is 95 parts of clear water to add mass ratio in a reservoir, then add double starch of phosphate that mass ratio is 1.3 parts,
(its mass ratio is 1 for acid treated starches and oxidized starch:0.6:0.4), and with the rotating speed of 7000rpm stir 7 minutes；
B. the curdlan that mass ratio is 0.6 part is slowly added in the solution obtained by step a, and is turned with 7000rpm
Speed stirs 13 minutes, is to slowly warm up to 66 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing
Solution is cooled to room temperature in whipping process；
C. propylene glycol alginate, mass ratio that mass ratio is 0.4 part are sequentially added in the solution obtained by step b is
0.3 part of lauryl sodium sulfate and mass ratio is 0.3 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 5000rpm
~15 minutes；It is 0.5 part finally to sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.0 parts and mass ratio that mass ratio is 0.5 part
Sodium formate, and stirred 6 minutes with the rotating speed of 5000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.743g/cm3, apparent viscosity is：81.5mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.687g/cm3, apparent viscosity is：75.2mPas, density become
Rate is：- 7.51%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment sixThe six of the preparation of workover fluid
A. the clear water that mass ratio is 95 parts is added in a reservoir, is then added the oxidation hydroxypropyl that mass ratio is 1.3 parts and is formed sediment
(its mass ratio is 1 for powder and sodium carboxymethyl starch:1), and with the rotating speed of 7000rpm stir 7 minutes；
B. the curdlan that mass ratio is 0.6 part is slowly added in the solution obtained by step a, and is turned with 7000rpm
Speed stirs 13 minutes, is to slowly warm up to 66 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing
Solution is cooled to room temperature in whipping process；
C. propylene glycol alginate, mass ratio that mass ratio is 0.4 part are sequentially added in the solution obtained by step b is
0.3 part of lauryl sodium sulfate and mass ratio is 0.3 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 5000rpm
~15 minutes；It is 0.5 part finally to sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.0 parts and mass ratio that mass ratio is 0.5 part
Sodium formate, and stirred 6 minutes with the rotating speed of 5000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.773g/cm3, apparent viscosity is：83.9mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.709g/cm3, apparent viscosity is：74.5mPas, density become
Rate is：- 8.28%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment sevenThe seven of the preparation of workover fluid
A. the clear water that mass ratio is 95 parts is added in a reservoir, and it is double then to add the acetylation diacid that mass ratio is 1.3 parts
(its mass ratio is 0.6 for starch, oxidation hydroxypropul starch and sodium carboxymethyl starch:0.8:1) 7, and with the rotating speed of 7000rpm are stirred
Minute；
B. the curdlan that mass ratio is 0.6 part is slowly added in the solution obtained by step a, and is turned with 7000rpm
Speed stirs 13 minutes, is to slowly warm up to 66 DEG C in addition and whipping process, and maintain this temperature to reaction to terminate；Then continuing
Solution is cooled to room temperature in whipping process；
C. propylene glycol alginate, mass ratio that mass ratio is 0.4 part are sequentially added in the solution obtained by step b is
0.3 part of lauryl sodium sulfate and mass ratio is 0.3 part of sodium carboxymethylcellulose, and stirs 10 with the rotating speed of 5000rpm
~15 minutes；It is 0.5 part finally to sequentially add thiocarbamide, the potassium chloride that mass ratio is 1.0 parts and mass ratio that mass ratio is 0.5 part
Sodium formate, and stirred 6 minutes with the rotating speed of 5000rpm, you can allot finished product.
Density is after workover fluid manufactured in the present embodiment is prepared：0.770g/cm3, apparent viscosity is：84.0mPa·s.Will
Workover fluid at 100 DEG C heat rolling 24 it is small when after, density is changed into：0.711g/cm3, apparent viscosity is：74.7mPas, density become
Rate is：- 7.66%.
The workover fluid can complete workover treatment when stabilization time >=24 are small at 100 DEG C.
Embodiment eightPractical application
Obtained each workover fluid in above example is used to the different circulations that can not establish by long-term operation to take out
Oil well is tested, live reacting cycle toward the workover fluid for injecting various dose in well according to the actual conditions of oil well, during
Big leakage does not occur, than more smoothly completing operation.It is then restored to certain production level, recovery rate within 2~3 days after operation
Reach 85~168%, oil layer protection significant effect.
It is to be understood that these embodiments are only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it should also be understood that,
After reading the content taught by the present invention, those skilled in the art can make various modifications or changes to the present invention, these
Equivalent form is also fallen within the scope of the appended claims of the present application.
Claims (5)
- A kind of 1. workover fluid, it is characterised in that：Include the component of following quality proportioning：
- 2. workover fluid as claimed in claim 1, it is characterised in that：The workover fluid includes the component of following quality proportioning：
- 3. workover fluid as claimed in claim 1, it is characterised in that：The starch-based thickener includes the double shallow lakes of acetylation diacid The double starch of powder, phosphate, acid treated starches, oxidized starch, oxidation hydroxypropul starch, the one or more of sodium carboxymethyl starch.
- A kind of 4. preparation method of workover fluid, it is characterised in that：Comprise the following steps：A. the clear water that mass ratio is 90~100 parts is added in a reservoir, then adds the starch base that mass ratio is 1.0~1.6 parts Thickener, is stirred 5~8 minutes；B. 10~15 points of the curdlan that mass ratio is 0.4~0.8 part and stirring are slowly added in the solution obtained by step a Clock, is to slowly warm up to 65 DEG C~68 DEG C in addition and whipping process, and maintains this temperature to reaction to terminate；Then continuing to stir During solution is cooled to room temperature；C. propylene glycol alginate, mass ratio that mass ratio is 0.2~0.6 part are sequentially added in the solution obtained by step b is 0.2~0.4 part of lauryl sodium sulfate and mass ratio is 0.2~0.6 part of sodium carboxymethylcellulose, stirs 10~15 points Clock；Finally sequentially adding thiocarbamide, the potassium chloride that mass ratio is 0.8~1.2 part and mass ratio that mass ratio is 0.3~0.7 part is 0.3~0.7 part of sodium formate, is stirred 4~8 minutes, you can allot finished product.
- 5. the preparation method of workover fluid as claimed in claim 4, it is characterised in that：The rotating speed stirred in the step a is 6000~8000rpm；The rotating speed stirred in step b and step c is 4000~6000rpm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108690587A (en) * | 2018-05-21 | 2018-10-23 | 北京力会澜博能源技术有限公司 | The capsule suede agent of natural gas well suede bag pressure well liquid |
| CN109897619A (en) * | 2019-04-08 | 2019-06-18 | 中国石油集团渤海钻探工程有限公司 | A kind of Solid Free foam well workover liquid system and preparation method thereof strengthened based on gel |
| CN115717062A (en) * | 2022-11-15 | 2023-02-28 | 中国石油天然气集团有限公司 | Low-density foam workover fluid for reducing workover loss of low-pressure gas well and application thereof |
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