CN105001839A - High-temperature-resistant high-density strong-inhibition drilling fluid system and preparation method - Google Patents

High-temperature-resistant high-density strong-inhibition drilling fluid system and preparation method Download PDF

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Publication number
CN105001839A
CN105001839A CN201510509989.3A CN201510509989A CN105001839A CN 105001839 A CN105001839 A CN 105001839A CN 201510509989 A CN201510509989 A CN 201510509989A CN 105001839 A CN105001839 A CN 105001839A
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China
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drilling fluid
density
fluid system
quality
seawer quality
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CN201510509989.3A
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CN105001839B (en
Inventor
谢玉洪
董星亮
张勇
李中
李炎军
张超
黄熠
段泽辉
韦龙贵
吴江
杨仲涵
黄亮
黄凯文
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
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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
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • 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

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a high-temperature-resistant high-density strong-inhibition drilling fluid system. With a density of 2.0-2.3 g/cm<3>, the drilling fluid system is prepared from sea water, bentonite (1-4% of mass of sea water), sodium carbonate (0.2-0.4% of mass of sea water), 0.5-3% by sea water mass of a first fluid loss additive (0.5-3% of mass of sea water), a second fluid loss additive (3-15% of mass of sea water), drilling-fluid-used non-fluorescence solid white asphalt (2-18% of mass of sea water), drilling-fluid-used solid polymeric alcohol (5-15% of mass of sea water), organic salt (50-100% of mass of sea water) and an inert weighting material obtained according to density calculation. The main treating agent used in the drilling fluid system is an organic salt water-soluble weighting agent, the drilling fluid system is high in high-temperature-resistant capability, high in density and strong in inhibition, and the sea water can be directly utilized for pulping when the drilling fluid system is in use, so that the preparation of a marine drilling fluid is greatly facilitated, the production cost is reduced, and the work efficiency is improved.

Description

A kind of high temperature high density high inhibition drilling fluid system and preparation method
Technical field
The present invention relates to a kind of drilling fluid system, specifically the drilling fluid system of a kind of high temperature resistance, high-density, strong inhibition capability, belong to drilling well oilfield technology field.
Background technology
Drilling fluid is known as the blood of drilling well, excellent drilling liquid technology be ensure drilling well production operation safety, high-quality, efficiently, one of important guarantee measure fast.Along with the oil gas drilling degree of depth constantly increases, hp-ht well is increasing, and the situation that drilling well runs into becomes increasingly complex, and this has higher requirement to high temperature high density drilling fluid.
Organic salt drilling fluid mainly refers to sodium formiate, KCOOH drilling fluid at first, and along with technical development in recent years, various organic acid salt is as cesium formate, potassium acetate, Tripotassium Citrate, soluble tartrate, ammonium acetate, ammonium citrate, ammonium tartrate.The core of organic salt drilling fluid completion fluid system is the aqueous solutions of organic salts with higher density and fine inhibition.Through the development of more than ten years, organic salt drilling fluid well finishing liquid has become the technical way of complex condition drilling well, completion and reservoir protection in the world, effectively can solve Wellbore Stability, High Temperature High Pressure problem that these complex conditions cause.
The pressure factor boring chance along with domestic and international drilling well is more and more higher, more and more higher to the density requirements of drilling fluid.Conventional organic salt such as sodium formiate, potassium formiate increase the weight of limited in one's ability, although cesium formate has and higher increases the weight of ability, expensive.Organic salt and the composite drilling fluid system of inertia high-density weighting material can solve this difficult point.
Summary of the invention
The object of the present invention is to provide a kind of drilling fluid system; this drilling fluid system has can resist that 220 DEG C of high temperature, density are high, the feature of strong inhibition capability; and its preparation method is simple; moderate cost, has good suitability and result of use in constructions such as the drilling well of the complex condition such as high temperature, high pressure, completion and reservoir protections.
The present invention is achieved through the following technical solutions: a kind of high temperature high density high inhibition drilling fluid system, its density is 2.0 ~ 2.3g/cm 3by the drilling fluid unstressed configuration solid albino bitumen of the second fluid loss agent of the first fluid loss agent of the sodium carbonate of the wilkinite of seawater, seawer quality 1 ~ 4%, seawer quality 0.2 ~ 0.4%, seawer quality 0.5 ~ 3%, seawer quality 3 ~ 15%, seawer quality 2 ~ 18%, the drilling fluid solid polymerization alcohol of seawer quality 5 ~ 15%, the organic salt of seawer quality 50 ~ 100%, and according to the inertia high-density weighting material composition that density calculation obtains; During preparation, first by the seawater of half quality, wilkinite, sodium carbonate with rotating speed 100 ~ 400r/min mix and blend 5 ~ 10min, then add the first fluid loss agent, stir 10 ~ 20min, add drilling fluid unstressed configuration solid albino bitumen and stir 10 ~ 20min, add residual seawater, drilling fluid solid polymerization alcohol, continue stirring 10 ~ 30min, add organic salt, stir 5 ~ 10min, finally add inertia high-density weighting material, regulating density to 2.0 ~ 2.3g/cm 3.
Described drilling fluid system is preferably: described drilling fluid system density is 2.3g/cm 3, be the Na of the wilkinite by seawater, seawer quality 2%, seawer quality 03% 2cO 3, the first fluid loss agent of seawer quality 2.6%, the second fluid loss agent of seawer quality 15%, the drilling fluid of seawer quality 15% unstressed configuration solid albino bitumen, the drilling fluid solid polymerization alcohol of seawer quality 10%, the organic salt of seawer quality 100%, and the inertia high-density weighting material composition obtained according to density calculation.
In technical solution of the present invention, described inertia high-density weighting material is preferably barite.
In technical solution of the present invention, the screen over-size of described wilkinite 75 microns is less than 4%.
In technical solution of the present invention, described first fluid loss agent is preferably fluid loss agent Redu1.
In technical solution of the present invention, described second fluid loss agent is preferably fluid loss agent Redu200.
In technical solution of the present invention, described organic salt is preferably organic salt water-soluble weighting agent weight3 or the water-soluble weighting agent weight4 of organic salt.
In technical solution of the present invention, described drilling fluid unstressed configuration solid albino bitumen is preferably drilling fluid unstressed configuration solid albino bitumen NFA-25.
In technical solution of the present invention, described drilling fluid solid polymerization alcohol is preferably drilling fluid solid polymerization alcohol PGCS-1.
The present invention is relative to the Advantageous Effects of prior art: drilling fluid of the present invention, using organic salt as main treating agent, directly can use seawater prepared bentonite drilling fluid during use, greatly facilitates the preparation of offshore drilling liquid; It has can resist that 220 DEG C of high temperature, density are high, the feature of strong inhibition capability, and its preparation method is simple, moderate cost, has good suitability and result of use in constructions such as the drilling well of the complex condition such as high temperature, high pressure, completion and reservoir protections.
Embodiment
Be described in further details the present invention below by embodiment, these embodiments are only used for the present invention is described, do not limit the scope of the invention.
Embodiment 1 is by following formulated density 2.3g/cm 3drilling fluid: the NFA-25 of the first fluid loss agent Redu1 of the sodium carbonate of seawater, seawer quality 0.3%, the wilkinite of seawer quality 2%, seawer quality 2.6%, the second fluid loss agent Redu200 of seawer quality 15%, seawer quality 15%, the PGCS-1 of seawer quality 10%, the water-soluble weighting agent Weigh3 of organic salt of seawer quality 100%, barite; During preparation, first by the seawater of half quality, wilkinite, sodium carbonate with rotating speed 200r/min mix and blend 8min, then add the first fluid loss agent, stir 15min, add drilling fluid unstressed configuration solid albino bitumen and stir 10min, add residual seawater, drilling fluid solid polymerization alcohol, continue to stir 30min, add organic salt, stir 8min, finally add inertia high-density weighting material, regulating density is to 2.3g/cm 3.Obtained drilling fluid is rolled 16 hours through 220 DEG C of heat, and performance is as shown in table 1.
Table 1 heat rolls rear property of drilling fluid
。
3250 ~ 4470m well section opened by embodiment 2 YC26-2-1 well four is group bottom, songs of the oriole sea, yellow stream group, Mei Shan group stratum, and it is huge thick-layer shape mud stone that understratum is organized in songs of the oriole sea, easy aquation, easily collapses; Yellow stream group stratum is lamelliform pelitic siltstone and pelitic siltstone in huge thick-layer shape mud stone folder, easy aquation, fugitively to collapse; Mei Shan group stratum is huge thick-layer shape mud stone, and easy aquation, easily collapses.Yellow stream group understratum and Mei Shan group stratum are High Temperature High Pressure stratum, and likely occur leakage.Require that drilling fluid temperature resistance ability is strong, have stronger inhibition, stronger improvement mud cake ability, shutoff caving-preventing ability and leak-off wall building ability.
Adopt technical solution of the present invention, prepare drilling fluid by the formula in table 2, preparation method is: first by the seawater of half quality, wilkinite, sodium carbonate with rotating speed 400r/min mix and blend 5min, then add the first fluid loss agent, stir 10min, add drilling fluid unstressed configuration solid albino bitumen and stir 15min, add residual seawater, drilling fluid solid polymerization alcohol, continue to stir 20min, add organic salt, stir 5min, finally add inertia high-density weighting material, regulating density to 2.0 ~ 2.3g/cm 3.
Obtained for this enforcement drilling fluid is applied to the wellbore construction process that 3250 ~ 4470m well section opened by YC26-2-1 well four.Prove through actually operating, drilling fluid of the present invention can resist 220 DEG C of high temperature, has stronger inhibition, stronger improvement mud cake ability, shutoff caving-preventing ability and leak-off wall building ability.
Embodiment 3 ~ 5 is filled a prescription according in table 2, prepares the drilling fluid system of different densities.
Each component concentration in table 2 embodiment, in seawater for 100%, as follows:
。
Preparation method is: first by the seawater of half quality, wilkinite, sodium carbonate with rotating speed 100r/min mix and blend 10min, then the first fluid loss agent is added, stir 20min, add drilling fluid unstressed configuration solid albino bitumen and stir 20min, add residual seawater, drilling fluid solid polymerization alcohol, continue to stir 10min, add organic salt, stir 10min, finally add inertia high-density weighting material, regulating density.
After testing, the fundamental property of the drilling fluid system adopting technical solution of the present invention to prepare is in table 3.
Table 3 property of drilling fluid

Claims (9)

1. a high temperature high density high inhibition drilling fluid system, is characterized in that: its density is 2.0 ~ 2.3g/cm 3by the drilling fluid unstressed configuration solid albino bitumen of the second fluid loss agent of the first fluid loss agent of the sodium carbonate of the wilkinite of seawater, seawer quality 1 ~ 4%, seawer quality 0.2 ~ 0.4%, seawer quality 0.5 ~ 3%, seawer quality 3 ~ 15%, seawer quality 2 ~ 18%, the drilling fluid solid polymerization alcohol of seawer quality 5 ~ 15%, the organic salt of seawer quality 50 ~ 100%, and according to the inertia high-density weighting material preparation that density calculation obtains; During preparation, first by the seawater of half quality, wilkinite, sodium carbonate with rotating speed 100 ~ 400r/min mix and blend 5 ~ 10min, then add the first fluid loss agent, stir 10 ~ 20min, add drilling fluid unstressed configuration solid albino bitumen and stir 10 ~ 20min, add residual seawater, drilling fluid solid polymerization alcohol, continue stirring 10 ~ 30min, add organic salt, stir 5 ~ 10min, finally add inertia high-density weighting material, regulating density to 2.0 ~ 2.3g/cm 3.
2. drilling fluid system according to claim 1, is characterized in that: described drilling fluid system density is 2.3g/cm 3, be the Na of the wilkinite by seawater, seawer quality 2%, seawer quality 03% 2cO 3, the first fluid loss agent of seawer quality 2.6%, the second fluid loss agent of seawer quality 15%, the drilling fluid of seawer quality 15% unstressed configuration solid albino bitumen, the drilling fluid solid polymerization alcohol of seawer quality 10%, the organic salt of seawer quality 100%, and the inertia high-density weighting material composition obtained according to density calculation.
3. drilling fluid system according to claim 1 and 2, is characterized in that: described inertia high-density weighting material is barite.
4. drilling fluid system according to claim 1 and 2, is characterized in that: the screen over-size of described wilkinite 75 microns is less than 4%.
5. drilling fluid system according to claim 1 and 2, is characterized in that: described first fluid loss agent is fluid loss agent Redu1.
6. drilling fluid system according to claim 1 and 2, is characterized in that: described second fluid loss agent is fluid loss agent Redu200.
7. drilling fluid system according to claim 1 and 2, is characterized in that: described organic salt is organic salt water-soluble weighting agent weight3 or the water-soluble weighting agent weight4 of organic salt.
8. drilling fluid system according to claim 1 and 2, is characterized in that: described drilling fluid unstressed configuration solid albino bitumen is drilling fluid unstressed configuration solid albino bitumen NFA-25.
9. drilling fluid system according to claim 1 and 2, is characterized in that: described drilling fluid solid polymerization alcohol is drilling fluid solid polymerization alcohol PGCS-1.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103740343A (en) * 2014-01-16 2014-04-23 中国石油集团渤海钻探工程有限公司 Na2SiO3-KCl anti-collapse drilling fluid and preparation method thereof
CN103952125A (en) * 2014-05-13 2014-07-30 中国石油化工股份有限公司 Blocking solution for MDT (mean down time) testing and production method thereof
CN104312557A (en) * 2014-08-22 2015-01-28 中国石油化工集团公司 High-density low-frictional-resistance drilling fluid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103740343A (en) * 2014-01-16 2014-04-23 中国石油集团渤海钻探工程有限公司 Na2SiO3-KCl anti-collapse drilling fluid and preparation method thereof
CN103952125A (en) * 2014-05-13 2014-07-30 中国石油化工股份有限公司 Blocking solution for MDT (mean down time) testing and production method thereof
CN104312557A (en) * 2014-08-22 2015-01-28 中国石油化工集团公司 High-density low-frictional-resistance drilling fluid

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
周建东等: "《有机盐钻井液在塔里木东河油田DH1-8-6井的应用》", 《钻井液与完井液》 *
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing

Co-patentee after: CNOOC (China) Limited Zhanjiang Branch

Patentee after: China Offshore Oil Group Co., Ltd.

Address before: 100000 China oil tower, 25 Chaoyangmen North Street, Chaoyang District, Beijing

Co-patentee before: CNOOC (China) Limited Zhanjiang Branch

Patentee before: China National Offshore Oil Corporation