CN104479649A - Low density water-based drilling fluid for drilling into shale - Google Patents

Low density water-based drilling fluid for drilling into shale Download PDF

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Publication number
CN104479649A
CN104479649A CN201410850834.1A CN201410850834A CN104479649A CN 104479649 A CN104479649 A CN 104479649A CN 201410850834 A CN201410850834 A CN 201410850834A CN 104479649 A CN104479649 A CN 104479649A
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China
Prior art keywords
drilling fluid
gram
add
stir
shale
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CN201410850834.1A
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CN104479649B (en
Inventor
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
    • 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
    • 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
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/34—Lubricant additives

Abstract

The invention relates to low density water-based drilling fluid for drilling into shale. The fluid overcomes the problem of wellbore instability when the water-based drilling fluid is used. The drilling fluid adopts the technical scheme that the drilling fluid comprises the following raw materials: 30-50g bentonite for the drilling fluid, 1.5-2.5g sodium carbonate, 5-10g sodium hydroxide, 15-20g shear strength improving agent SZT, 2-5g zwitterionic polymer coating agent FA367, 10-15g fluid loss agent CG810S-T, 0.2-1g drilling fluid rheological regulator JHRM, 40-60g highlight calcium carbonate C-L501, 10-30g lubricant R-16, 25-35g emulsified paraffin, 40-60g solid polymerization alcohol JHGC for the drilling fluid and 1000g tap water. The tap water, the bentonite for the drilling fluid and soda are added for prehydration for 24h first, the shear strength improving agent SZT is added under the mixing condition at 8000r/min, then the treatment agents are sequentially added under the mixing condition at 500r/min, pH (potential of hydrogen) of a system is regulated to 8.5, and barite is added finally. The drilling fluid system has good rejection capability and blocking performance and is used for drilling of a long horizontal section of a shale bed.

Description

One creeps into shale low density water base drilling fluid
Technical field
The present invention relates to one and creep into shale low density water base drilling fluid, be particularly suitable for creeping into of the long lateral segment of shale of microfracture growth.
Background technology
Shale gas well generally adopts oil base drilling fluid both at home and abroad at present, because oil base drilling fluid can improve the capillary pressure of hygroscopicity shale, preventing drilling fluid to the intrusion of shale, by using oil base drilling fluid and synthetic base drilling fluid, effectively can solve the problem of hole instability.In reply shale gas horizontal well wellbore stability, oil base drilling fluid system is adopted to be external most effective measures at present.Even if but adopt oil base drilling fluid, the shale formation that fracture or bedding are grown, also must strengthen shutoff, enter to reduce liquid the pressure transmission (block fluid passage) caused on stratum.Oil base drilling fluid, at lubrication, anti-sticking and fall the advantage having water-base drilling fluid incomparable in resistance effect, drags pressure problem when can avoid slide drilling, and this is also the basic reason place of its widespread use.But damage because oil base working fluid makes the wettability modification of low permeability pay and gas-bearing formation, reservoir permeability is greatly reduced, thus reduce oil well output.Indoor core experiment shows, when core by hydrophilic change into oleophylic time, its recovery ratio drops to 17% by 51%.Therefore, oil base drilling fluid should be adopted cautiously to bore at low permeability pay and open payzone, when especially having emulsifying agent, tensio-active agent in oil base drilling fluid.
The relative merits water-base drilling fluid advantage comparing oil base drilling fluid 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 shale formation to overcome, suppress shale formation aquation to be caved in, can effectively stitch by shutoff shale micro-nano hole, spy provides one to creep into shale low density water base drilling fluid for this reason.
In order to achieve the above object, the present invention by the following technical solutions: one creeps into shale low density water base drilling fluid, it is characterized in that preparing the raw materials used component of this drilling fluid and content is, wherein mass unit is gram: sodium carbonate 1.5-2.5; Drilling fluid wilkinite 30-50; Carry and cut agent SZT 15-20; Amphoteric ion polymer coating agent FA3672-5; Fluid loss agent CG810S-T10-15; Drilling fluid rheology conditioning agent JHRM 0.2-1; High light calcium carbonate C-L50140-60; Lubricant R-1610-30; Polymeric alcohol 40-60; Emulsified olefin 25-35; Tap water 1000, the alkali lye regulation system pH being mixed with 40% with NaOH is 8.5, adds barite regulating density of drilling liquid to 1.20g/cm 3.
A kind of preparation method creeping into shale low density water base drilling fluid of the present invention is:
Water temperature is risen to 70 DEG C by the tap water first measuring 1000 grams, adds the drilling fluid wilkinite of 30-50 gram under low speed 500r/min electric stirring, stirs 10min and adds 1.5-2.5 gram of Na 2cO 3stir 30min again, under normal temperature and pressure after prehydration 24h, add under high speed 8000r/min electric stirring 15-20 gram carry cut agent SZT stir 6min, under low speed 500r/min electric stirring, add 2-5 gram of amphoteric ion polymer coating agent FA367 again stir 5min, add 10-15 gram of fluid loss agent CG810S-T and stir 5min, add 0.2-1 gram of drilling fluid rheology conditioning agent JHRM and stir 5min, add 40-60 gram high smooth calcium carbonate C-L501 and stir 15min, add 10-30 gram of lubricant R-16 and stir 5min, add 40-60 gram of drilling fluid solid polymerization alcohol JHGC and stir 5min, add 25-35 gram of emulsified olefin and stir 10min, the alkali lye of 40% is mixed with NaOH, adjustment system pH is 8.5.Barite regulating density of drilling liquid is added to 1.20g/cm after stirring 30min 3stir 1 hour, obtained this low density water base drilling fluid.
Above-mentioned preparation method drilling fluid wilkinite used, Na 2cO 3, carry cut agent SZT, amphoteric ion polymer coating agent FA367, fluid loss agent CG810S-T, drilling fluid rheology conditioning agent JHRM, high light calcium carbonate C-L501, lubricant R-16, drilling fluid solid polymerization alcohol JHGC, emulsified olefin, barite be sell goods on market, strictly by industry standard or enterprise's mark inspection when purchasing, eligible could use.Specifically in table 1.
This low density water of table 1 base drilling fluid basic raw material particular sheet
The shale low density water base drilling fluid that creeps into provided by the invention has following beneficial effect compared with current used shale drilling fluid system: 1. to compare oil base drilling fluid environmental pollution little for this water-base drilling fluid; 2. there is stronger suppression shut-off capacity; 3. effectively caving pressure can be reduced; 4. temperature convection sex change impact is less; 5. cost is relatively low; 7. meet leakage easily to process.
Embodiment:
Below in conjunction with specific examples, the present invention is further illustrated
Example 1: a kind of compound method of creeping into shale low density water base drilling fluid.
Water temperature is risen to 70 DEG C by the tap water first measuring 1000 grams, adds the drilling fluid wilkinite of 30 grams under low speed 500r/min electric stirring, stirs 10min and adds 1.5 grams of Na 2cO 3stir 30min again, under normal temperature and pressure after prehydration 24h, under high speed 8000r/min electric stirring, add 15 grams of SZT stir 6min, under low speed 500r/min electric stirring, add 2 grams of amphoteric ion polymer coating agent FA367 again stir 5min, add 10 grams of fluid loss agent CG810S-T and stir 5min, add 0.2 gram of drilling fluid rheology conditioning agent JHRM and stir 5min, add 40 grams high smooth calcium carbonate C-L501 and stir 15min, add 10 grams of lubricant R-16 and stir 5min, add 40 grams of drilling fluid solid polymerization alcohol JHGC and stir 5min, add 25 grams of emulsified olefines and stir 10min, the alkali lye of 40% is mixed with NaOH, adjustment system pH is 8.5.Barite regulating density of drilling liquid is added to 1.20g/cm after stirring 30min 3stir 1 hour, obtained this low density water base drilling fluid.
Example 2: adopt XGRL-2 type roller heating stove to carry out rolling determination of recovery rates to drilling fluid system of the present invention.
This low density of table 2 water base drilling fluid system rolling rate of recovery experimental result
Drilling fluid composition Experiment condition Reclaim quality (g) The rate of recovery (%)
Clear water+50g red beds soil 105℃/16h 5.64 11.28
Low density water base drilling fluid system+50g red beds soil 105℃/16h 47.67 95.34
Note: 1) red beds soil is Sichuan red beds soil landwaste, and shale is appeared for long 7 shale are appeared, and be 6 ~ 10 orders, the rate of recovery was the 40 order rate of recovery; 2) in table, result is 2 experimental data averages.
This low density of table 3 water base drilling fluid system linear expansion experimental result
Note: 1) core is drilling fluid wilkinite (soil with slurry) compression moulding; 2) filtrate is the filtrate extruded after system heat rolls 105 DEG C/16h; 3) in table, result is 2 experimental data averages.
From the rolling rate of recovery and the linear expansion rate experiment of table 2, this shale low density water base drilling fluid of table 3, the rolling rate of recovery reaches more than 95%, 16h linear expansion rate and only has 22.56% to have the dispersion of suppression aquation and swelling property preferably.
Example 3: adopt XGRL-2 type roller heating stove Continuous Heat to roll, test this shale water-base drilling fluid thermal stability result.
This low density of table 4 shale water base drilling fluid system Evaluation of Thermal Stability
This low density of table 5 shale water base drilling fluid system temperature resistance merit rating
Glued by the known system of the thermal stability results of table 4, cut with filter loss along with rolling time increase change very micro-, there is good thermostability.From the temperature resistance capacity experimental of table 5 this low density water base drilling fluid known under 150 DEG C of conditions sticky cut significantly reduce, HTHP dehydration increases considerably, but can maintain rheological, HTHP dehydration well under 120 DEG C of condition, can temperature resistance 120 DEG C.

Claims (2)

1. creep into a shale low density water base 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:
Sodium hydroxide be made into mass percentage concentration be 40% solution regulation system pH value be 8.5, add barite regulating density of drilling liquid to 1.20g/cm 3.
2. a compound method for drilling fluid as claimed in claim 1, is characterized in that: water temperature is risen to 70 DEG C by the tap water first measuring 1000 grams, adds the wilkinite of 30-50 gram under low speed 500r/min electric stirring, stirs 10min and adds 1.5-2.5 gram of Na 2cO 3stir 30min again, under normal temperature and pressure after prehydration 24h, add under high speed 8000r/min electric stirring 15-20 gram carry cut agent SZT stir 6min, under low speed 500r/min electric stirring, add 2-5 gram of amphoteric ion polymer coating agent FA367 again stir 5min, add 10-15 gram of fluid loss agent CG810S-T and stir 5min, add 0.2-1 gram of drilling fluid rheology conditioning agent JHRM and stir 5min, add 40-60 gram high smooth calcium carbonate C-L501 and stir 15min, add 10-30 gram of lubricant R-16 and stir 5min, add 40-60 gram of drilling fluid solid polymerization alcohol JHGC and stir 5min, add 25-35 gram of emulsified olefin and stir 10min, add 40-60 gram, high light calcium carbonate and stir 5min under 8000r/min, the alkali lye of 40% is mixed with NaOH, adjustment system pH adds barite regulating density of drilling liquid to 1.20g/cm after 8.5. stirs 30min 3stir 1h, obtained this low density water base drilling fluid.
CN201410850834.1A 2014-12-31 2014-12-31 One kind drilling shale low density water base drilling fluid Active CN104479649B (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105176503A (en) * 2015-09-15 2015-12-23 西南石油大学 Cationic polymer water-based drilling fluid for drilling shale
CN105694829A (en) * 2016-03-14 2016-06-22 西南石油大学 Low-friction drilling fluid for drilling of shale
CN105733528A (en) * 2016-03-11 2016-07-06 西南石油大学 Low-density fluorescent drilling fluid for drilling shale
CN106634900A (en) * 2016-10-10 2017-05-10 西南石油大学 Shale strong-inhibition nano plugging water-based drilling fluid
CN108251086A (en) * 2018-02-08 2018-07-06 西南石油大学 A kind of water-base drilling fluid suitable for Changning Weiyuan area
CN108518216A (en) * 2018-03-12 2018-09-11 西南石油大学 A kind of plugging effect evaluation method of low slit low permeability formation
CN108517201A (en) * 2018-03-28 2018-09-11 方建波 A kind of preparation method of the high compound tackifier of anticalcium type
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
CN110016326A (en) * 2018-01-09 2019-07-16 中石化石油工程技术服务有限公司 A kind of low-activity alcohol base drilling fluid and its preparation method
CN110746945A (en) * 2019-11-18 2020-02-04 廊坊庆兴化工有限公司 Filtrate reducer modified polysaccharide for drilling fluid

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105176503A (en) * 2015-09-15 2015-12-23 西南石油大学 Cationic polymer water-based drilling fluid for drilling shale
CN105733528A (en) * 2016-03-11 2016-07-06 西南石油大学 Low-density fluorescent drilling fluid for drilling shale
CN105733528B (en) * 2016-03-11 2018-06-22 西南石油大学 A kind of drilling shale low-density fluorescence drilling fluid
CN105694829A (en) * 2016-03-14 2016-06-22 西南石油大学 Low-friction drilling fluid for drilling of shale
CN105694829B (en) * 2016-03-14 2018-10-26 西南石油大学 A kind of low frictional resistance drilling fluid of drilling shale
CN106634900B (en) * 2016-10-10 2019-03-26 西南石油大学 A kind of shale strong rejection capability nanometer closure water-base drilling fluid
CN106634900A (en) * 2016-10-10 2017-05-10 西南石油大学 Shale strong-inhibition nano plugging water-based drilling fluid
CN110016326A (en) * 2018-01-09 2019-07-16 中石化石油工程技术服务有限公司 A kind of low-activity alcohol base drilling fluid and its preparation method
CN108251086A (en) * 2018-02-08 2018-07-06 西南石油大学 A kind of water-base drilling fluid suitable for Changning Weiyuan area
CN108518216A (en) * 2018-03-12 2018-09-11 西南石油大学 A kind of plugging effect evaluation method of low slit low permeability formation
CN108518216B (en) * 2018-03-12 2019-03-05 西南石油大学 A kind of plugging effect evaluation method of low slit low permeability formation
CN108517201A (en) * 2018-03-28 2018-09-11 方建波 A kind of preparation method of the high compound tackifier of anticalcium type
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
CN110746945A (en) * 2019-11-18 2020-02-04 廊坊庆兴化工有限公司 Filtrate reducer modified polysaccharide for drilling fluid

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