CN104232035A - Drilling fluid suitable for low-permeability oil/gas reservoir and preparation method of drilling fluid - Google Patents
Drilling fluid suitable for low-permeability oil/gas reservoir and preparation method of drilling fluid Download PDFInfo
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- CN104232035A CN104232035A CN201310373962.7A CN201310373962A CN104232035A CN 104232035 A CN104232035 A CN 104232035A CN 201310373962 A CN201310373962 A CN 201310373962A CN 104232035 A CN104232035 A CN 104232035A
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- 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
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Abstract
The invention relates to the field of oil-gas well engineering, and particularly relates to drilling fluid suitable for a low-permeability oil/gas reservoir and a preparation method of the drilling fluid. The drilling fluid comprises the following components in parts by weight: 1,000 parts of water, 20-60 parts of bentonite for drilling fluid, 0.4-3 parts of sodium carbonate, 2-15 parts of tackifier, 5-20 parts of an amine inhibitor, 20-50 parts of a filtrate reducer, 20-50 parts of a plugging anti-collapse agent, 20-40 parts of a polymer oil reservoir protective agent, and 3-10 parts of a waterproof locking agent. The drilling fluid provided by the invention has good plugging property for a low-permeability reservoir; since the surface tension of filtrate is low, the water locking damage of the filtrate to an oil reservoir permeability is effectively reduced and the surface properties of rock are changed to the situation beneficial to crude oil flow and protection of an oil/gas reservoir, thereby protecting the oil/gas reservoir.
Description
Technical field
The present invention relates to Oil-Gas Well Engineering technical field, be specifically related to a kind of drilling fluid and the preparation method that are applicable to low permeability reservoirs.
Background technology
Shengli Oil Field has abundant Low permeable oil and gas reservoirs resource, and be mainly distributed in the area such as Bo Nan, stake west, Shanghe, Niu Zhuan, Shi Nan, purifying, great Wang Bei, Shao Jia, great Lu lake, No. five stakes, distributed areas are wide, geological condition is complicated, exploratory development difficulty is large.Compared with domestic similar hydrocarbon-bearing pool, it is large that Shengli Oil Field Low permeable oil and gas reservoirs has reserves, and oil reservoir buries comparatively dark, poor properties, reservoir diagenetic and the feature such as compacting effort is strong, nonuniformity is serious, recovery percent of reserves is low.Very easily the various pollution damage such as water-sensitive, water lock is produced because outside fluid invades reservoir in drilling process; along with the continuity of drilling time; any drilling fluid all inevitably has filtrate invaded formation; for low permeability reservoir; even if the seldom filtrate invaded formation of amount; also interpore capillary force can be increased; reduce the rate of permeation of oil reservoir; change reservoir initial parameter; certain influence is caused to follow-up reservoir reconstruction, and reservoir is once suffer damage, is difficult to recover; therefore to the oil layer protection work of such oil reservoir, especially seem important.
Summary of the invention
The object of the invention is to; overcome the deficiencies in the prior art; provide a kind of drilling fluid and the preparation method that are applicable to low permeability reservoirs; drilling fluid provided by the present invention, by adding polymer oil layer protective agent and the Waterproof lock agent etc. containing fluorocarbon surfactant component in the drilling fluid of reservoir top respectively, realizes top drilling fluid being transform as " synergy " drilling fluid system low permeability reservoir to good protection effect.
For solving the problems of the technologies described above; technical scheme of the present invention is: a kind of drilling fluid being applicable to low permeability reservoirs, moiety and parts by weight as follows: water: 1000, drilling fluid wilkinite: 20-60, sodium carbonate: 0.4-3, tackifier: 2-15, amine inhibitor: 5-20, fluid loss agent: 20-50, shutoff anti-sloughing agent: 20-50, polymer oil layer protective agent: 20-40, Waterproof lock agent: 3-10.Described water is fresh water.
Tackifier of the present invention are polyacrylamide PAM, one or more in polyacrylamide sylvite (KPAM), cationic polyacrylamide CPAM, anionic polyacrylamide (HPAM), XC biological polymer, co-polymer of sulfonate.
Amine inhibitor of the present invention is one or more in organic amine, polyamine, amido polyalcohols.
Fluid loss agent of the present invention is one or more in potassium humate, Sodium salts humic acids, humic acids carboxymethylated product, humic acids sulfonated products, humic acids nitration product, sulfonated lignite resin, hyper-branched resol, sulfonated-pheno-formoldehyde resin, sulfonated lignin sulfonated-pheno-formoldehyde resin condenses, hydroxypropylated starch, carboxymethyl starch, anti-temperature starch DFD-140.
Shutoff anti-sloughing agent of the present invention is one or more in oxidized bitumen, emulsified bitumen, sulfonated gilsonite, rock asphalt, modifying asphalt, emulsified olefin, nanoemulsions, polymeric alcohol.
Polymer oil layer protective agent of the present invention is the oil layer protective agent of independent research.Apply for national patent protection, national inventing patent application number: 201110449988.6, patent name: a kind of polymer for drilling fluid oil layer protective agent and preparation method.
Waterproof lock agent of the present invention is one or more in commercially available fluorocarbon surfactant and conventional surfactants compound product, as the SATRO Waterproof lock agent that Jing Zhou, Hubei Province Jia Hua company limited produces.Such treatment agent had both utilized the strong hydrophobic and oil repellent of fluorocarbon surfactant and stronger surface-active character, overcame again the expensive defect of fluorocarbon surfactant.Fluorocarbon surfactant and conventional surfactants composite after, its surfactivity often exceeds the surfactivity of one-component, the Waterproof lock agent of preparation has extremely low surface tension usually, can reduce drilling fluid filtrate to the full extent, reduces the generation of low permeability reservoir Water-blocking damage.
Be applicable to a drilling fluid preparation method for low permeability reservoirs, comprise following steps:
A. base slurry is prepared: be in the water of 1000, add the drilling fluid wilkinite that sodium carbonate that weight is 0.4-3 and weight are 20-60 in weight, stir 20-60min, prehydration 22-26h;
B. add tackifier: in the mixed solution of step a gained, add the tackifier that weight is 2-15, stir;
C. add amine inhibitor: in the mixed solution of step b gained, add weight is 5-20 amine inhibitor, stir;
D. add fluid loss agent: in step c gained drilling fluid in add the fluid loss agent that weight is 20-50, stir;
E. add shutoff anti-sloughing agent: in steps d gained drilling fluid in add the shutoff anti-sloughing agent that weight is 20-50, stir;
F. add polymer oil layer protective agent: in step e, add the oil layer protective agent that weight is 20-40 in gained drilling fluid, stir;
G. add Waterproof lock agent: in step f, in gained drilling fluid, add the Waterproof lock agent that weight is 3-10, stir.
The churning time described in b, c, d, e, f, g step of described preparation method is 15-25 min, is wherein more excellent scheme with 18-22 min.
The invention has the beneficial effects as follows: drilling fluid provided by the present invention, by adding polymer oil layer protective agent and the Waterproof lock agent etc. containing fluorocarbon surfactant component in the drilling fluid of reservoir top respectively, realizes top drilling fluid being transform as " synergy " drilling fluid system low permeability reservoir to good protection effect.In collaborative use procedure, first utilize softening, the distortion of polymer oil layer protective agent, adsorption, the borehole wall is formed the stifled temporarily barrier that one deck toughness is strong, perviousness is extremely low, stops later stage drilling fluid to enter hydrocarbon zone to greatest extent.Along with the continuity of drilling time, any drilling fluid all inevitably has filtrate invaded formation.For low permeability reservoir, even if the seldom filtrate invaded formation of amount, also interpore capillary force can be increased, reduce the rate of permeation of oil reservoir, change reservoir initial parameter, certain influence is caused to follow-up reservoir reconstruction, therefore in drilling fluid, add the Waterproof lock agent containing fluorocarbon surfactant component, such treatment agent is utilized to have certain hydrophobic and oil repellent and stronger surface-active character, farthest reduce the surface tension of filtrate, reduce filtrate to the water blocking damage of reservoir permeability, make rock surface character to being conducive to crude oil flow, the direction being conducive to reservoir protec-tion changes, reach reservoir protec-tion object.
The surface tension of drilling fluid filtrate is low, can reduce the generation of Water-blocking damage.Polymer oil layer protective agent, Waterproof lock agent and other treatment agents can organically combine by low permeability reservoirs " synergy " drilling fluid system, and meet the technical essential that " synergy " is theoretical, the sealing ratiod of system to core is greater than 90%; After cutting the stifled temporarily end (3mm ~ 3.5mm) of a section very short, permeability resume figure is greater than 94%, has good oil layer protection effect to low permeability reservoir.
Embodiment
embodiment 1
Stir in cup at height and add 1000mL fresh water; open stirrer, under 4000r/min, add 20g sodium bentonite, 0.4g calcium carbonate, 5g polyacrylamide (PAM), 10g organic amine, 20g sulfonated-pheno-formoldehyde resin (SMP-II), 20g sulfonated lignite resin (SPNH), 30g modifying asphalt (HQ-1), 30g polymer oil layer protective agent, 3g Waterproof lock agent SATRO(while stirring purchased from Jingzhou Jiahua Technology Co., Ltd.).
embodiment 2
Stir in cup at height and add 1000mL fresh water; open stirrer, under 4000r/min, add 40g sodium bentonite, 2g calcium carbonate, 2g co-polymer of sulfonate (DLP), 15g amido polyalcohols, the hyper-branched resol of 20g (SPC-II), 30g sulfonated lignite resin (SPNH), 50g emulsified bitumen, 30g polymer oil layer protective agent, 5g Waterproof lock agent SATRO(while stirring purchased from Jingzhou Jiahua Technology Co., Ltd.).
embodiment 3
Stir in cup at height and add 1000mL fresh water; open stirrer, under 4000r/min, add 60g sodium bentonite, 3g calcium carbonate, 3g XC biological polymer, 20g polyamine, the hyper-branched resol of 30g (SPC-II), 20g sulfonated lignite resin (SPNH), 30g sulfonated gilsonite, 20g polymeric alcohol, 40g polymer oil layer protective agent, 10g Waterproof lock agent SATRO(while stirring purchased from Jingzhou Jiahua Technology Co., Ltd.).
Below the effect in embodiment is described.
1. the fundamental property of system and surface tension
The rheological of table 1 embodiment and interfacial tension
As can be seen from Table 1, embodiment has lower surface tension, is conducive to the generation preventing Water-blocking damage.
2. oil layer protection effect assessment
Adopt the artificial cores of different pore size rate of permeation to carry out pollution experiment, utilize rock core-flowage experiment instrument to measure sealing ratiod and the rate of permeation of core before and after Low permeable oil and gas reservoirs " synergy " drilling fluid contamination.Experimental result is in table 2.
table 2 under different rock sample rate of permeation condition, the oil layer protection effect of system
As known from Table 2, the sealing ratiod of embodiment to core is greater than 90%; After cutting the stifled temporarily end (3mm ~ 3.5mm) of a section very short, permeability resume figure is greater than 94%, under synergy by treatment agent is described, drilling fluid system can establish shield ring in the distance distance that stifled end is very short temporarily, stops filtrate and solid phase particles to enter the deep of rock sample.To low permeability reservoir, there is good oil layer protection effect.
3. outer filter cake returns row's plugging removal effect
The outer filter cake of Low permeable oil and gas reservoirs " synergy " drilling fluid system, after hydrocarbon zone being formed to stifled shielding temporarily, can remove shield-temporary plugging by the impact of later stage crude production and solvency action gradually.For this has been experimental evaluation.The results are shown in Table 3.
table 3 returns the impact of row pressure difference on permeability resume figure
From table 3 data, when returning row pressure power when close to 0.2MPa, permeability resume figure >=92% of embodiment; show in actual production process; along with the extraction of crude oil, the reservoir solid phase blocking caused by AMP oil layer protective agent and the water lock caused by filtrate, can be got rid of gradually.
Claims (9)
1. be applicable to a drilling fluid for low permeability reservoirs, it is characterized in that: moiety and parts by weight as follows: water: 1000, drilling fluid wilkinite: 20-60, sodium carbonate: 0.4-3, tackifier: 2-15, amine inhibitor: 5-20, fluid loss agent: 20-50, shutoff anti-sloughing agent: 20-50, polymer oil layer protective agent: 20-40, Waterproof lock agent: 3-10.
2. a kind of drilling fluid being applicable to low permeability reservoirs according to claim 1, is characterized in that:
Described tackifier are polyacrylamide, one or more in polyacrylamide sylvite, cationic polyacrylamide, anionic polyacrylamide, XC biological polymer, co-polymer of sulfonate.
3. a kind of drilling fluid being applicable to low permeability reservoirs according to claim 1, is characterized in that:
Described amine inhibitor is one or more in organic amine, polyamine, amido polyalcohols.
4. a kind of drilling fluid being applicable to low permeability reservoirs according to claim 1, is characterized in that: described fluid loss agent is one or more in potassium humate, Sodium salts humic acids, humic acids carboxymethylated product, humic acids sulfonated products, humic acids nitration product, sulfonated lignite resin, hyper-branched resol, sulfonated-pheno-formoldehyde resin, sulfonated lignin sulfonated-pheno-formoldehyde resin condenses, hydroxypropylated starch, carboxymethyl starch, anti-temperature starch DFD-140.
5. a kind of drilling fluid being applicable to low permeability reservoirs according to claim 1, is characterized in that: described shutoff anti-sloughing agent is one or more in oxidized bitumen, emulsified bitumen, sulfonated gilsonite, rock asphalt, modifying asphalt HQ-1, emulsified olefin, nanoemulsions, polymeric alcohol.
6. a kind of drilling fluid being applicable to low permeability reservoirs according to claim 1, is characterized in that: described Waterproof lock agent is fluorocarbon surfactant and conventional surfactants compound product.
7. be applicable to a drilling fluid preparation method for low permeability reservoirs, it is characterized in that: comprise following steps:
Preparation base slurry: be add the drilling fluid wilkinite that sodium carbonate that weight is 0.4-3 and weight are 20-60 in the water of 1000 in weight, stir 20-60min, prehydration 22-26h;
Add tackifier: in the mixed solution of step a gained, add the tackifier that weight is 2-15, stir 20min;
Add amine inhibitor: in the mixed solution of step b gained, add weight is 5-20 amine inhibitor, stir;
Add fluid loss agent: in step c gained drilling fluid in add the fluid loss agent that weight is 20-50, stir;
Add shutoff anti-sloughing agent: in steps d gained drilling fluid in add the shutoff anti-sloughing agent that weight is 20-50, stir;
Add polymer oil layer protective agent: in step e, add the oil layer protective agent that weight is 20-40 in gained drilling fluid, stir;
Add Waterproof lock agent: in step f, in gained drilling fluid, add the Waterproof lock agent that weight is 3-10, stir.
8. a kind of drilling fluid preparation method being applicable to low permeability reservoirs according to claim 7, is characterized in that: the churning time in described b, c, d, e, f, g step is 15-25 min.
9. a kind of drilling fluid preparation method being applicable to low permeability reservoirs according to claim 7, is characterized in that: the churning time in described b, c, d, e, f, g step is 18-22 min.
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| CN201310373962.7A CN104232035B (en) | 2013-06-20 | 2013-08-26 | A kind of drilling fluid and preparation method suitable for low permeability reservoirs |
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| CN201310373962.7A CN104232035B (en) | 2013-06-20 | 2013-08-26 | A kind of drilling fluid and preparation method suitable for low permeability reservoirs |
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| CN104513652A (en) * | 2014-12-31 | 2015-04-15 | 西南石油大学 | High-density water-based drilling fluid for drilling shale |
| CN104610942A (en) * | 2014-12-29 | 2015-05-13 | 上海煤气第二管线工程有限公司 | Water-based drilling fluid composition for trenchless drilling |
| CN104946214A (en) * | 2015-07-10 | 2015-09-30 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Environment-friendly natural polymer drilling fluid |
| CN104946215A (en) * | 2015-06-11 | 2015-09-30 | 西安石油大学 | Method for preparing drilling fluid using guar gum fracturing fluid waste water |
| CN106147728A (en) * | 2015-04-27 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of shale horizontal well water-base drilling fluid and preparation method thereof |
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| CN107446559A (en) * | 2017-07-11 | 2017-12-08 | 中石化石油工程技术服务有限公司 | A kind of closure type drilling fluid and its method reinforced applied to the borehole wall |
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| CN104513652B (en) * | 2014-12-31 | 2017-09-05 | 西南石油大学 | One kind drilling shale high-density water-based drilling fluid |
| CN104513652A (en) * | 2014-12-31 | 2015-04-15 | 西南石油大学 | High-density water-based drilling fluid for drilling shale |
| CN106147728A (en) * | 2015-04-27 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of shale horizontal well water-base drilling fluid and preparation method thereof |
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| 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 |
| CN107446559A (en) * | 2017-07-11 | 2017-12-08 | 中石化石油工程技术服务有限公司 | A kind of closure type drilling fluid and its method reinforced applied to the borehole wall |
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| CN108485618A (en) * | 2018-03-27 | 2018-09-04 | 中国石油大学(华东) | A kind of Non-clay drilling fluid and its preparation method and application of protection low permeability reservoir |
| CN108485618B (en) * | 2018-03-27 | 2019-05-24 | 中国石油大学(华东) | A kind of Non-clay drilling fluid and its preparation method and application for protecting low permeability reservoir |
| CN109135694A (en) * | 2018-10-23 | 2019-01-04 | 四川泓华油气田工程科技有限公司 | A kind of drilling fluid sealing agent and preparation method thereof |
| CN109294531A (en) * | 2018-11-26 | 2019-02-01 | 天津普利华石油助剂有限公司 | A kind of composite asphalt anti-collapse inhibitor, water-base drilling fluid and its application of water-base drilling fluid |
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