CN104513652A - High-density water-based drilling fluid for drilling shale - Google Patents

High-density water-based drilling fluid for drilling shale Download PDF

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Publication number
CN104513652A
CN104513652A CN201410852999.2A CN201410852999A CN104513652A CN 104513652 A CN104513652 A CN 104513652A CN 201410852999 A CN201410852999 A CN 201410852999A CN 104513652 A CN104513652 A CN 104513652A
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drilling fluid
gram
water
stir
minutes
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CN104513652B (en
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白杨
王平全
王波
杜敬国
时海涛
余冰洋
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Southwest Petroleum University
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Southwest Petroleum University
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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
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Earth Drilling (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a high-density water-based drilling fluid for drilling shale and solves the problem of wellbore instability during shale stratum drilling of a water-based drilling fluid. The technical scheme is that the high-density water-based drilling fluid is prepared from the following raw materials: 900-1,000 g of tap water, 30-60 g of bentonite, 2-4 g of Na2CO3, 1-3 g of a drilling-fluid polymer salt-resistant tackifying inhibitor CP-1, 3-5 g of drilling-fluid carboxymethyl starch GMS-1, 10-30 g of high-temperature-resistant special resin SPNH-III, 15-25 g of a high-temperature-resistant viscosity reducer JNT-1, 10-30 g of a lubricative nano emulsion NL-III, 10-20 g of a fluorescence-free white asphalt anti-collapse agent WBF-II and 10-30 g of water-dispersing cationic emulsified asphalt power SFT-I; an alkali solution with the mass percentage concentration of 40% is prepared from NaOH to adjust the pH of the system to 9; a hydrocarbon reservoir protection weighting agent YB-I is adopted to increase the density of the system to 1.8-2.0 g/cm<3>. The high-density water-based drilling fluid is low in cost and high in inhibition performance, causes little reservoir damage and is used for drilling a deep shale stratum.

Description

One creeps into shale high-density water-based drilling fluid
Technical field
The present invention relates to one and creep into shale high-density water-based drilling fluid for shale gas exploitation, be particularly suitable for creeping into of the deep formation of the long lateral segment of shale that microfracture is grown.
Background technology
At present along with the rise at home of unconventional energy resource shale gas, after the stock assessment of a new round, shale gas has been proved to have in China and has exploited future widely, solve current domestic hydrocarbon resources anxiety, realize oil gas increasing the storage is produced, ensure the most important thing of national energy security, some key scientific problems meanwhile around shale gas exploitation are also brought into schedule.Shale formation studies as non-reservoir in the past, but the exploratory development along with shale gas enters commercial mining substantial period, shale formation is developed as main force's reservoir, Longma small stream group in the such as Sichuan-chongqing Region, key area of research at present and Bamboo Temple group reservoir are Fissile Shale stratum, compare with traditional water sensitivity mud shale, its water-sensitive is more weak, sloughing mechanism is also biased to some extent, cause occurring that filtrate invades when carrying out long horizontal well drilling, borehole wall generating period caves in, there is chronesthesy, this situation that in the past only accidentally can occur in large section mud cream rock straight well section, but in shale gas drilling process, inevitable situation is become, in addition be horizontal well, therefore its complicacy is higher.
Mainly oil base drilling fluid is adopted in current domestic shale gas horizontal well drilling process, and major part is from foreign enterprise, this is mainly derived from the successful experience of U.S.'s shale gas exploitation, but oil base drilling fluid high cost, high pollution are its natural flaws, can obtain high performance imitative oil base water-base drilling fluid and the Worth Expecting that makes a breakthrough on novel nano drilling fluid by research, having obtained a lot of relative merits water-base drilling fluid advantage comparing oil base drilling fluid that is in progress at present in this respect has: 1. environmental protection; 2. Sweet natural gas leaching easily finds; 3. temperature convection sex change impact is less; 4. cost is relatively low; 5. meet leakage easily to process, shortcoming has: 1. borehole wall stability is poor; 2. thermostability is relatively poor, is easy to high temperature gel; 3. resistance to crocking difference (solid phase and CO 2, H 2s gas contamination), safeguard that work for the treatment of amount is large; 4. lubricate and sticking control scarce capacity.Therefore, developing a kind of novel water-based drilling fluid that can be applicable to shale formation and substitute oil base drilling fluid and can solve the gordian technique that the problem such as wellbore stability, reservoir pollution is then current shale gas drilling well, is also the difficult point place of domestic and international shale drilling well.
Summary of the invention
The object of the invention is: borehole well instability problem when using at present water-base drilling fluid to creep into deep layer shale formation to overcome, suppress shale formation aquation to be caved in, spy provides one to creep into shale high-density water-based drilling fluid for this reason.
In order to achieve the above object, the present invention is by the following technical solutions: one creeps into shale high-density water-based drilling fluid, it is characterized in that preparing the raw materials used each component of this drilling fluid and content thereof, wherein mass unit is gram: tap water 900-1000, drilling fluid wilkinite 30-60; Na 2cO 32-4; Polymer for drilling fluid anti-salt thickening inhibitor C P-11-3; Drilling fluid carboxymethyl starch GMS-13-5; High temperature resistance Special Resin SPNH-III 10-30; High temperature resistant thinner JNT-115-25; Oilness nanoemulsions NL-III 10-30; Unstressed configuration albino bitumen anti-sloughing agent WBF-II 10-20; Water dispersible cationic emulsified bitumen powder SFT-I10-30; Be mixed with NaOH the alkali lye that mass percentage concentration is 40%, adjustment system pH is 9, adopts drilling fluid reservoir protection weighting agent YB-I to increase the weight of system density to 1.8-2.0g/cm 3.
A kind of preparation method creeping into shale high-density water-based drilling fluid of the present invention is:
Water temperature is risen to 65 DEG C by the tap water first measuring 900-1000 gram, adds the drilling fluid wilkinite of 30-60 gram under low speed 600r/min electric stirring, stirs and within 10 minutes, adds 2-4 gram of Na 2cO 3stir 30 minutes again, under normal temperature and pressure after prehydration 24h, under low speed 500r/min electric stirring, add 1-3 gram of polymer for drilling fluid anti-salt thickening inhibitor C P-1 stir 5 minutes, add 3-5 gram of drilling fluid carboxymethyl starch GMS-1 and stir 5 minutes, add 10-30 gram of high temperature resistance Special Resin SPNH-III and stir 5 minutes, add 15-25 gram of high temperature resistant thinner JNT-1 and stir 15 minutes, add 10-30 oilness nanoemulsions NL-III and stir 15 minutes, add 10-20 gram of unstressed configuration albino bitumen anti-sloughing agent WBF-II and stir 5 minutes; Add 10-30 gram of water dispersible cationic emulsified bitumen powder SFT-I and stir 15 minutes; Be mixed with the alkali lye of mass percentage concentration 40% with NaOH, adjustment system pH is 9, stirs 1 hour, adopts drilling fluid reservoir protection weighting agent YB-I to increase the weight of system density to 1.8-2.0g/cm 3, this high-density water-based drilling fluid obtained.
Above-mentioned preparation method drilling fluid used wilkinite, polymer for drilling fluid anti-salt thickening inhibitor C P-1, drilling fluid carboxymethyl starch GMS-1, high temperature resistance Special Resin SPNH-III, high temperature resistant thinner JNT-1, oilness nanoemulsions NL-III, sodium carbonate Na 2cO 3, sodium hydroxide NaOH, unstressed configuration albino bitumen anti-sloughing agent WBF-II, water dispersible cationic emulsified bitumen powder SFT-I, drilling fluid reservoir protection weighting agent YB-I be sell goods on market; strictly by industry standard or enterprise's mark inspection when purchasing, eligible could use.Specifically in table 1.
This high-density of table 1 shale water-base drilling fluid basic raw material particular sheet
The shale high-density water-based drilling fluid that creeps into provided by the invention has the following advantages compared with existing used shale drilling fluid system: 1. have stronger suppression shut-off capacity; 2. little to reservoir damage; 3. high-temperature resistance is strong; 4. cost is relatively low;
Embodiment:
Below in conjunction with specific examples, the present invention is further illustrated
Example 1: a kind of compound method of creeping into shale high-density water-based drilling fluid.
Water temperature is risen to 65 DEG C by the tap water first measuring 1000 grams, adds the drilling fluid wilkinite of 30 grams under low speed 600r/min electric stirring, stirs and within 10 minutes, adds 2 grams of Na 2cO 3stir 30 minutes again, under normal temperature and pressure after prehydration 24h, under low speed 500r/min electric stirring, add 1 gram of polymer for drilling fluid anti-salt thickening inhibitor C P-1 stir 5 minutes, add 5 grams of drilling fluid carboxymethyl starch GMS-1 and stir 5 minutes, add 10 grams of high temperature resistance Special Resin SPNH-III and stir 5 minutes, add 15 grams of high temperature resistant thinner JNT-1 and stir 15 minutes, add 30 oilness nanoemulsions NL-III and stir 15 minutes, add 10 grams of unstressed configuration albino bitumen anti-sloughing agent WBF-II and stir 5 minutes; Add 30 grams of water dispersible cationic emulsified bitumen powder SFT-I and stir 15 minutes; Be mixed with the alkali lye of mass percentage concentration 40% with NaOH, adjustment system pH is 9, stirs 1 hour, adds 1260 grams of drilling fluid reservoir protection weighting agent YB-I and increase the weight of system density to 1.8g/cm 3, this high-density water-based drilling fluid obtained.
Example 2: adopt XGRL-2 type roller heating stove to carry out rolling determination of recovery rates to high-density water-based drilling fluid system of the present invention.
The table 2 rock sample rolling rate of recovery (150 DEG C/16h)
This high-density water-based drilling fluid of table 3 system linear expansion experimental result
From the rolling rate of recovery and the linear expansion rate experiment of table 2, this high-density water-based drilling fluid of table 3, the rolling rate of recovery reaches more than 99%, 16h linear expansion rate and only has 18.47%, illustrates that this water base drilling fluid system has good rejection.

Claims (2)

1. creep into a shale high-density water-based drilling fluid, it is characterized in that: prepare the raw materials used component of this drilling fluid and content is, its mass unit is gram:
Tap water 900-1000;
Drilling fluid wilkinite main component: polynite 30-60;
Sodium carbonate code name Na 2cO 32-4;
Polymer for drilling fluid anti-salt thickening inhibitor main component: acrylamide, potassium acrylate, organic cation monomer
Multipolymer code name CP-1 1-3;
Drilling fluid carboxymethyl starch main component: starch code name GMS-1 3-5;
High temperature resistance Special Resin main component: polycondensate code name SPNH-III 10-30 of humic acid and phenol;
High temperature resistant thinner main component: gallic acid code name JNT-1 15-25;
Oilness nanoemulsions main component: rubber code name NL-III 10-30;
Unstressed configuration albino bitumen anti-sloughing agent main component: pitch code name WBF-II 10-20;
Water dispersible cationic emulsified bitumen powder main component: pitch code name SFT-I 10-30;
Sodium hydroxide be made into mass percentage concentration be 40% alkali lye regulation system pH value be 9, adopt drilling fluid reservoir protection weighting agent YB-I to increase the weight of system density to 1.8-2.0g/cm 3.
2. the compound method of a drilling fluid as claimed in claim 1, it is characterized in that: water temperature is risen to 65 DEG C by the tap water first measuring 900-1000 gram, under low speed 600r/min electric stirring, add the drilling fluid wilkinite of 30-60 gram, stir and within 10 minutes, add 2-4 gram of Na 2cO 3stir 30 minutes again, under normal temperature and pressure after prehydration 24h, under low speed 500r/min electric stirring, add 1-3 gram of polymer for drilling fluid anti-salt thickening inhibitor C P-1 stir 5 minutes, add 3-5 gram of drilling fluid carboxymethyl starch GMS-1 and stir 5 minutes, add 10-30 gram of high temperature resistance Special Resin SPNH-III and stir 5 minutes, add 15-25 gram of high temperature resistant thinner JNT-1 and stir 15 minutes, add 10-30 gram of oilness nanoemulsions NL-III and stir 15 minutes, add 10-20 gram of unstressed configuration albino bitumen anti-sloughing agent WBF-II and stir 5 minutes; Add 10-30 gram of water dispersible cationic emulsified bitumen powder SFT-I and stir 15 minutes; Be mixed with the alkali lye of mass percentage concentration 40% with NaOH, adjustment system pH is 9, stirs 1 hour; Drilling fluid reservoir protection weighting agent YB-I is adopted to increase the weight of system density to 1.8-2.0g/cm 3, this high-density water-based drilling fluid obtained.
CN201410852999.2A 2014-12-31 2014-12-31 One kind drilling shale high-density water-based drilling fluid Active CN104513652B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105586019A (en) * 2016-03-11 2016-05-18 西南石油大学 Low-fluorescent anti-sloughing drilling fluid
CN106543991A (en) * 2016-11-05 2017-03-29 西南石油大学 A kind of water base high density temperature resistance antipollution drilling fluid of deep-well saturated salt
CN107118750A (en) * 2017-06-20 2017-09-01 西南石油大学 A kind of deep-well anti-high temperature anti-saturation salt water high-density water-based drilling fluid and preparation method thereof
CN109233763A (en) * 2018-10-26 2019-01-18 中国地质大学（武汉） A kind of drilling fluid and preparation method thereof for mini pile pore-forming

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060073982A1 (en) * 2004-10-05 2006-04-06 M-I L.L.C. Shale hydration inhibition agent and method of use
CN101538456A (en) * 2009-04-10 2009-09-23 西安石油大学 Nanometer drilling fluid
CN101935519A (en) * 2010-08-09 2011-01-05 中联煤层气国家工程研究中心有限责任公司 Drilling fluid and preparation method thereof
CN103937470A (en) * 2014-04-14 2014-07-23 中国石油化工集团公司 Water-based drilling fluid applicable to horizontal shale and preparation method thereof
CN104232035A (en) * 2013-06-20 2014-12-24 中国石油化工股份有限公司 Drilling fluid suitable for low-permeability oil/gas reservoir and preparation method of drilling fluid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060073982A1 (en) * 2004-10-05 2006-04-06 M-I L.L.C. Shale hydration inhibition agent and method of use
CN101538456A (en) * 2009-04-10 2009-09-23 西安石油大学 Nanometer drilling fluid
CN101935519A (en) * 2010-08-09 2011-01-05 中联煤层气国家工程研究中心有限责任公司 Drilling fluid and preparation method thereof
CN104232035A (en) * 2013-06-20 2014-12-24 中国石油化工股份有限公司 Drilling fluid suitable for low-permeability oil/gas reservoir and preparation method of drilling fluid
CN103937470A (en) * 2014-04-14 2014-07-23 中国石油化工集团公司 Water-based drilling fluid applicable to horizontal shale and preparation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105586019A (en) * 2016-03-11 2016-05-18 西南石油大学 Low-fluorescent anti-sloughing drilling fluid
CN106543991A (en) * 2016-11-05 2017-03-29 西南石油大学 A kind of water base high density temperature resistance antipollution drilling fluid of deep-well saturated salt
CN107118750A (en) * 2017-06-20 2017-09-01 西南石油大学 A kind of deep-well anti-high temperature anti-saturation salt water high-density water-based drilling fluid and preparation method thereof
CN109233763A (en) * 2018-10-26 2019-01-18 中国地质大学（武汉） A kind of drilling fluid and preparation method thereof for mini pile pore-forming
CN109233763B (en) * 2018-10-26 2020-01-17 中国地质大学（武汉） Drilling fluid for forming hole in micro pile and preparation method thereof

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