CN104531108A - Solid phase-free foam workover fluid, preparation method and uses thereof - Google Patents
Solid phase-free foam workover fluid, preparation method and uses thereof Download PDFInfo
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- CN104531108A CN104531108A CN201410745215.6A CN201410745215A CN104531108A CN 104531108 A CN104531108 A CN 104531108A CN 201410745215 A CN201410745215 A CN 201410745215A CN 104531108 A CN104531108 A CN 104531108A
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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
- C09K8/02—Well-drilling compositions
- C09K8/38—Gaseous or foamed well-drilling compositions
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
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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
- 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
Abstract
The invention relates to a solid phase-free foam workover fluid, which comprises 102.8-116.8 parts by mass of purified water, 2-5 parts by mass of a xanthan gum, 1-3 parts by mass of thiourea, 0-1 part by mass of dodecyl dimethyl benzyl ammonium chloride, 0.6-3.6 parts by mass of dodecyl dimethyl betaine, and 0.6-3.6 parts by mass of cocoamido propyl hydroxy sulfobetaine. The preparation method comprises: preparing a xanthan gum aqueous solution, sequentially adding thiourea and dodecyl dimethyl benzyl ammonium chloride to the xanthan gum aqueous solution, stirring until achieving complete dissolving so as to form a mixed solution, finally adding dodecyl dimethyl betaine and cocoamido propyl hydroxy sulfobetaine to the mixed solution, and stirring to obtain the solid phase-free foam workover fluid. According to the present invention, with the solid phase-free foam workover fluid, the liquid discharge difficulty, the heavy stratum damage, difficultly-recovered productivity and other problems caused by the low pressure gas reservoir are effectively solved; and the preparation method has characteristics of simplicity, low cost, and easy construction.
Description
Technical field
The invention belongs to oil-gas field development technical field, be specifically related to a kind of Solid Free foam workover fluid and its production and use.
Technical background
After Oil/gas Well enters development late stage; producing energy is constantly decayed; when there is abnormal or stopping production in Oil/gas Well; well workover must be carried out; change or optimization production tubing string, Oil/gas Well is resumed production, the stratum particularly containing high-content clay; but the deficiency of conventional workover fluid seriously constrains widely using of workover fluid.
At present, domestic a large amount of employing be aq. type workover fluid, it mainly comprises the follow-on workover fluid of mud, polymeric solid phase salt solution workover fluid and solid free brine workover fluid three class.Wherein the follow-on workover fluid of mud is because solid load is high, and formation injury is relatively large, uses less in recent years.The advantage of polymeric solid phase salt solution workover fluid is that to enter the leak-off on stratum few, and band grittiness can be good, but has again hole to existing crack, constructs heterogeneous low porosity and low permeability stratum, and solid phase injury is large, and water blocking damage is serious, is not easy the row of returning.Therefore solid free brine kill-job workover fluid is chosen and is employed in a lot of oil field, the maximum feature of this workover fluid is that the row of returning is easy, and shortcoming is: leak-off is large, formation injury is large, the well that particularly clay content is higher, water blocking damage is serious, cause simultaneously clay swelling, corrosion and with local water meet produce dirt and block the problems such as stratum, a large amount for the treatment of agent of for this reason having to add in the preparation process of this workover fluid, add use cost.
Gas reservoir and the oil reservoir of China's oil-gas field have different characteristics, as low viscosity, stress infringement responsive, wetting absorption, water lock etc., which dictates that gas-bearing formation is vulnerable.2008-2013, by tackling key problem research, for gas well operation, form Waterproof lock resin, temporarily stifled type gel and Solid Free organic salt three kinds of workover fluid systems altogether, can overcome the deficiency of above-mentioned solid free brine workover fluid, but the workover fluid density of these three kinds of systems is all greater than 1.0, for the gas reservoir of development late stage, because pressure factor is low, will there is discharge opeing difficulty, formation damage is serious, production capacity is difficult to the problems such as recovery, and above-mentioned three kinds of workover fluid systems cannot complete the well workover that pressure is less than 1.0 gas wells.
Summary of the invention
The object of the invention is to: a kind of Solid Free foam workover fluid and its production and use is provided, this workover fluid has that density is low, foam stabilization, lost circulation prevention effect, can solve conventional workover fluid low to production capacity, miss the discharge opeing difficulty that large low pressure gas-bearing formation brings, formation damage is serious, and production capacity is difficult to the problems such as recovery.
Technical scheme of the present invention is as follows:
A kind of Solid Free foam workover fluid, comprises following component: 102.8 ~ 116.8 mass parts pure water, 2 ~ 5 mass parts xanthan gum, 1 ~ 3 mass parts thiocarbamide, 0 ~ 1 mass parts dodecyl benzyl dimethyl ammonium chloride, 0.6 ~ 3.6 mass parts Varion CDG-K and 0.6 ~ 3.6 mass parts Cocamidopropyl hydroxyl sulphonic acid betaine.
The mass ratio of described Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1 ~ 3:3 ~ 1.
Prepare a method for above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) 2 ~ 5 parts of xanthan gum are joined in 102.8 ~ 116.8 mass parts pure water with the speed of 0.2 ~ 0.5g/min, stir, form xanthan gum solution;
(2) 1 ~ 3 mass parts thiocarbamide is joined in xanthan gum solution prepared by step (1), after stirring, add 0 ~ 1 mass parts dodecyl benzyl dimethyl ammonium chloride, be stirred to and dissolve completely, form mixing solutions;
(3) 0.6 ~ 3.6 mass parts Varion CDG-K and 0.6 ~ 3.6 mass parts Cocamidopropyl hydroxyl sulphonic acid betaine are joined in mixing solutions prepared by step (2), stir, obtain Solid Free foam workover fluid.
In described step (1), xanthan gum is analytical pure;
In described step (2), thiocarbamide is analytical pure; Dodecyl benzyl dimethyl ammonium chloride is technical pure;
In described step (3), Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine are technical pure;
The condition stirred in described step (3) is: rotating speed 8000-10000 rpm, time 5-20 min.
The application of above-mentioned Solid Free foam workover fluid in the workover treatment of low pressure gas reservoir.
A kind of Solid Free foam workover fluid, is composed of the following componentsly prepared from: pure water, xanthan gum (XC), thiocarbamide, dodecyl benzyl dimethyl ammonium chloride (1227), Varion CDG-K (BS-12), Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 2 ~ 5%, and thiocarbamide accounts for 1 ~ 3%, and dodecyl benzyl dimethyl ammonium chloride accounts for 0 ~ 1%, Varion CDG-K accounts for 0.6 ~ 3.6%, and Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 0.6 ~ 3.6%.
The preparation method of this Solid Free foam workover fluid comprises the following steps:
(1) put into 102.8 ~ 116.8 mass parts pure water in a reservoir, xanthan gum is slowly added in pure water, and be constantly stirred to pure water and xanthan gum is dissolved completely, for subsequent use;
(2) after pure water and xanthan gum are dissolved completely in step (1), add thiocarbamide and stir, mix to thiocarbamide and dissolve,
Add dodecyl benzyl dimethyl ammonium chloride, and be constantly stirred to and dissolve completely, for subsequent use;
(3) add Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 8000-10000 rpm, stir 5-20 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
Wherein the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1 ~ 3:3 ~ 1.
Described raw material xanthan gum (XC) is analytical pure, and Tianjin recovery fine chemistry industry institute produces; Sulphur urine is analytical pure, and Chengdu Ke Long chemical reagent factory produces; Dodecyl benzyl dimethyl ammonium chloride (1227) is technical pure, and Hubei Xinjing New Material Co., Ltd. produces; Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB) are technical pure, and Chengdu HTC of section produces.
In above-mentioned composition, pure water makees solvent; Xanthan gum cooks suds-stabilizing agent, thickening material, fluid loss agent; Thiocarbamide makees antioxidant; Dodecyl benzyl dimethyl ammonium chloride (1227) makees sterilant; Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB) do pore forming material.
Advantage compared with prior art of the present invention and beneficial effect as follows:
1) Solid Free foam workover fluid provided by the present invention has that low leak-off, low clay swell rate, low corrosion, water blocking damage are little, density adjustable, preparation are convenient, can not stratum be injured and can effectively solve conventional workover fluid low to production capacity, miss the discharge opeing difficulty that large low pressure gas-bearing formation brings, formation damage is serious, and production capacity is difficult to the problems such as recovery.Show this foam workover fluid stable performance at the western 80104 well onsite application of Xinjiang Oilfield 82, reach more than 72 hours steady time, injury rate≤8.85%, construction shares Solid Free Spume Well Killing Liquid 65m
3, wastage 8m
3, leak rate only 12%, completes workover treatment smoothly.
2) workover fluid of the present invention can be mixed with different density, selects different densities, make it have generalization according to different gas well features.
3) Solid Free foam workover fluid density provided by the present invention is at 0.451-0.936 g/cm
3, viscosity≤92.5 mPas, at least Absorbable organic halogens 24 hours at 100 DEG C.
4) raw material sources of the present invention are extensive, and cost is low, and preparation is convenient, and construction easily.
Embodiment
Following examples xanthan gum used is analytical pure; Thiocarbamide is analytical pure; Dodecyl benzyl dimethyl ammonium chloride is technical pure.
embodiment 1
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, and component is: pure water, xanthan gum (XC), thiocarbamide, Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the dosage of each component is all by the percentage calculation accounting for pure water quality, xanthan gum accounts for 2%, thiocarbamide accounts for 1%, Varion CDG-K accounts for 0.6%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 1.8%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1:3.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 102.8g pure water in a reservoir, 2.056g xanthan gum is added in pure water with the speed of 0.2g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in step (1), add 1.028g thiocarbamide, stir, to mixing, for subsequent use;
(3) add 0.6168g Varion CDG-K (BS-12) and 1.8504g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 10000 rpm, stir 5 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: for low pressure gas reservoir, the density of workover fluid is the key factor affecting its performance, and the height of density directly affects the size of filter loss, final decision well workover success, still using the maximum density of factor of influence as Performance evaluation criterion.After workover fluid preparation prepared by the present embodiment, density is: 0.736 g/cm
3, apparent viscosity is: 81.0 mPas.After by workover fluid, through roller heating stove, at 100 DEG C, heat rolls 24 hours, density becomes: 0.671 g/cm
3, apparent viscosity is: 73.0mPas, and rate of change of the density is :-8.83%.Show this workover fluid at 100 DEG C steady time >=24 hours, density still maintains less than 1.0, can complete workover treatment.
embodiment 2
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, and component is: pure water, xanthan gum (XC), thiocarbamide, Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 5%, thiocarbamide accounts for 1.2%, Varion CDG-K accounts for 1.5%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 1.5%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1:1.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 110g pure water in a reservoir, 5.5g xanthan gum is added in pure water with the speed of 0.3g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in step (1), add 1.32g thiocarbamide, stir, to mixing, for subsequent use;
(3) add 1.65g Varion CDG-K (BS-12) and 1.65g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 8000 rpm, stir 10 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: after preparation, density is: 0.452 g/cm
3, apparent viscosity is: 92.5 mPas.This workover fluid is after through roller heating stove, at 100 DEG C, heat rolls 24 hours, and density becomes: 0.501 g/cm
3, apparent viscosity is: 87.5 mPas, and rate of change of the density is: 4.9%.Show this workover fluid at 100 DEG C steady time >=24 hours, density still maintains less than 1.0, can complete workover treatment.
embodiment 3
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, and component is: pure water, xanthan gum (XC), thiocarbamide, Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 3%, thiocarbamide accounts for 2%, Varion CDG-K accounts for 2.4%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 0.8%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 3:1.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 116.8g pure water in a reservoir, 3.504g xanthan gum is added in pure water with the speed of 0.5g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in step (1), add 2.336g thiocarbamide, stir, to mixing, for subsequent use;
(3) add 2.803g Varion CDG-K (BS-12) and 0.934g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 9000 rpm, stir 10 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: after preparation, density is: 0.721 g/cm
3, apparent viscosity is: 82.0 mPas, and this workover fluid is after through roller heating stove, at 100 DEG C, heat rolls 25 hours, and density becomes: 0.684 g/cm
3, apparent viscosity is: 75.0mPas rate of change of the density is :-5.13%.Show this workover fluid at 100 DEG C steady time >=25 hours, density still maintains less than 1.0, can complete workover treatment.
embodiment 4
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, component is: pure water, xanthan gum (XC), thiocarbamide, dodecyl benzyl dimethyl ammonium chloride (1227), Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 4%, thiocarbamide accounts for 3%, dodecyl benzyl dimethyl ammonium chloride accounts for 0.15%, Varion CDG-K accounts for 3.6%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 3.6%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1:1.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 116.8g pure water in a reservoir, 4.672g xanthan gum is added in pure water with the speed of 0.5g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in the step (1), adding 3.504g thiocarbamide, stir, to dissolving completely, then adding 0.1752g dodecyl benzyl dimethyl ammonium chloride, and be constantly stirred to and dissolve completely, for subsequent use;
(3) add 4.2048g Varion CDG-K (BS-12) and 4.2048g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 8000 rpm, stir 15 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: after preparation, density is: 0.693 g/cm
3, apparent viscosity is: 86.0 mPas.This workover fluid is after through roller heating stove, at 110 DEG C, heat rolls 27 hours, and density becomes: 0.674 g/cm
3, apparent viscosity is: 80.0mPas, and rate of change of the density is :-2.74%.Show this workover fluid at 110 DEG C steady time >=27 hours, density still maintains less than 1.0, can complete workover treatment.
embodiment 5
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, component is: pure water, xanthan gum (XC), thiocarbamide, dodecyl benzyl dimethyl ammonium chloride (1227), Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 3.5%, thiocarbamide accounts for 1.2%, dodecyl benzyl dimethyl ammonium chloride accounts for 1%, Varion CDG-K accounts for 1.5%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 1.5%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1:1.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 116.8g pure water in a reservoir, 4.088g xanthan gum is added in pure water with the speed of 0.5g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in the step (1), adding 1.4016g thiocarbamide, stir, to dissolving completely, then adding 1.168g dodecyl benzyl dimethyl ammonium chloride, and be constantly stirred to and dissolve completely, for subsequent use;
(3) add 1.752g Varion CDG-K (BS-12) and 1.752g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 8000 rpm, stir 20 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: after preparation, density is: 0.694 g/cm
3, apparent viscosity is: 84.0 mPas.This workover fluid is after through roller heating stove, at 110 DEG C, heat rolls 27 hours, and density becomes: 0.684 g/cm
3, apparent viscosity is: 80.0mPas, and rate of change of the density is :-1.44%.Show this workover fluid at 110 DEG C steady time >=27 hours, density still maintains less than 1.0, can complete workover treatment.
embodiment 6
A kind of Solid Free foam workover fluid, this Solid Free foam workover fluid is composed of the following components, component is: pure water, xanthan gum (XC), thiocarbamide, dodecyl benzyl dimethyl ammonium chloride (1227), Varion CDG-K (BS-12) and Cocamidopropyl hydroxyl sulphonic acid betaine (CHSB).Wherein the add-on of each component is by the percentage calculation accounting for pure water quality, xanthan gum accounts for 3.6%, thiocarbamide accounts for 1.2%, dodecyl benzyl dimethyl ammonium chloride accounts for 0.15%, Varion CDG-K accounts for 1.5%, Cocamidopropyl hydroxyl sulphonic acid betaine accounts for 1.5%, and the mass ratio of Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1:1.
Prepare the preparation method of above-mentioned Solid Free foam workover fluid, comprise the following steps:
(1) put into 116.8g pure water in a reservoir, 4.205g xanthan gum is added in pure water with the speed of 0.5g/min, be constantly stirred to xanthan gum and dissolve completely, for subsequent use;
(2) after xanthan gum is dissolved completely in the step (1), adding 1.4016g thiocarbamide, stir, to dissolving completely, then adding 0.1752g dodecyl benzyl dimethyl ammonium chloride, and be constantly stirred to and dissolve completely, for subsequent use;
(3) add 1.752g Varion CDG-K (BS-12) and 1.752g Cocamidopropyl hydroxyl sulphonic acid betaine in the solution prepared to step (2) simultaneously, then under rotating speed 8000 rpm, stir 20 min with drilling fluid homogenizer, Solid Free foam workover fluid can be obtained.
The performance of workover fluid: after configuration, density is: 0.697 g/cm
3, apparent viscosity is: 84.0 mPas.This workover fluid is after through roller heating stove, at 110 DEG C, heat rolls 28 hours, and density becomes: 0.686 g/cm
3, rate of change of the density is :-1.57%, and apparent viscosity is: 80.5mPas.Show this workover fluid at 110 DEG C steady time >=28 hours, density still maintains less than 1.0, can complete workover treatment.
Above-mentioned lift experiment is only preferably example of the present invention, the protection domain be not intended to limit the present invention.All any amendments, improvement etc. done within principle of the present invention, all should be included within protection scope of the present invention.
Claims (8)
1. a Solid Free foam workover fluid, is characterized in that comprising following component: 102.8 ~ 116.8 mass parts pure water, 2 ~ 5 mass parts xanthan gum, 1 ~ 3 mass parts thiocarbamide, 0 ~ 1 mass parts dodecyl benzyl dimethyl ammonium chloride, 0.6 ~ 3.6 mass parts Varion CDG-K and 0.6 ~ 3.6 mass parts Cocamidopropyl hydroxyl sulphonic acid betaine.
2. a kind of Solid Free foam workover fluid according to claim 1, is characterized in that: the mass ratio of described Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine is 1 ~ 3:3 ~ 1.
3. prepare a method for Solid Free foam workover fluid described in claim 1 or 2, it is characterized in that comprising the following steps:
(1) 2 ~ 5 parts of xanthan gum are joined in 102.8 ~ 116.8 mass parts pure water with the speed of 0.2 ~ 0.5g/min, stir, form xanthan gum solution;
(2) 1 ~ 3 mass parts thiocarbamide is joined in xanthan gum solution prepared by step (1), after stirring, add 0 ~ 1 mass parts dodecyl benzyl dimethyl ammonium chloride, be stirred to and dissolve completely, form mixing solutions;
(3) 0.6 ~ 3.6 mass parts Varion CDG-K and 0.6 ~ 3.6 mass parts Cocamidopropyl hydroxyl sulphonic acid betaine are joined in mixing solutions prepared by step (2), stir, obtain Solid Free foam workover fluid.
4. the preparation method of a kind of Solid Free foam workover fluid according to claim 3, is characterized in that: in described step (1), xanthan gum is analytical pure.
5. the preparation method of a kind of Solid Free foam workover fluid according to claim 3, is characterized in that: in described step (2), thiocarbamide is analytical pure; Dodecyl benzyl dimethyl ammonium chloride is technical pure.
6. the preparation method of a kind of Solid Free foam workover fluid according to claim 3, is characterized in that: in described step (3), Varion CDG-K and Cocamidopropyl hydroxyl sulphonic acid betaine are technical pure.
7. a kind of preparation method of Solid Free foam workover fluid according to any one of claim 3-6, is characterized in that: the condition stirred in described step (3) is: rotating speed 8000-10000 rpm, time 5-20 min.
8. the application of Solid Free foam workover fluid in the workover treatment of low pressure gas reservoir described in claim 1 or 2.
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| CN104830293A (en) * | 2015-04-24 | 2015-08-12 | 西南石油大学 | Clay containing microfoam workover fluid, preparation method and application thereof |
| CN105647498A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Anti-water-lock workover fluid and preparation method |
| CN107338036A (en) * | 2017-06-28 | 2017-11-10 | 唐山冀油瑞丰化工有限公司 | Swollen type Solid Free workover fluid of one kind contracting and preparation method thereof |
| CN107987812A (en) * | 2017-11-16 | 2018-05-04 | 严希海 | A kind of workover fluid and preparation method thereof |
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| CN103965844A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气股份有限公司 | Low-density microbubble workover fluid |
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| CN102796498A (en) * | 2012-08-28 | 2012-11-28 | 西南石油大学 | Foam drilling fluid |
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| CN104830293A (en) * | 2015-04-24 | 2015-08-12 | 西南石油大学 | Clay containing microfoam workover fluid, preparation method and application thereof |
| CN105647498A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Anti-water-lock workover fluid and preparation method |
| CN105647498B (en) * | 2015-12-31 | 2018-12-25 | 中国石油天然气股份有限公司 | A kind of Waterproof lock workover fluid and manufacturing method |
| CN107338036A (en) * | 2017-06-28 | 2017-11-10 | 唐山冀油瑞丰化工有限公司 | Swollen type Solid Free workover fluid of one kind contracting and preparation method thereof |
| CN107338036B (en) * | 2017-06-28 | 2021-01-29 | 唐山冀油瑞丰化工有限公司 | Shrinkage-expansion type solid-free workover fluid and preparation method thereof |
| CN107987812A (en) * | 2017-11-16 | 2018-05-04 | 严希海 | A kind of workover fluid and preparation method thereof |
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Application publication date: 20150422 |