CN103450861B - A kind of low pressure reservoirs reservoir protection drilling fluid - Google Patents
A kind of low pressure reservoirs reservoir protection drilling fluid Download PDFInfo
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- CN103450861B CN103450861B CN201310360324.1A CN201310360324A CN103450861B CN 103450861 B CN103450861 B CN 103450861B CN 201310360324 A CN201310360324 A CN 201310360324A CN 103450861 B CN103450861 B CN 103450861B
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Abstract
The invention discloses a kind of low pressure reservoirs reservoir protection drilling fluid, relate to drilling liquid technology field, by weight percentage, component and formula are as follows: highly viscous polyanion cellulose: 0.1-0.3%；Sulfonated gilsonite: 0.5-1.0%；Low adhesive aggregation anionic cellulose: 0.1-0.3%；Caustic soda: 0.1%-0.2%；Fluid loss agent: 1-2%；Oil layer protective agent: 2-3%；Hargil: 2%-3%；Surplus is water.It is good that the present invention has plugging effect, and the smooth fine and close film-like of mud cake, to the low abundance reservoir Low Damage of low porosity and low permeability, the feature that formula, technique with slurry are simple and easy to do.
Description
Technical field
The present invention relates to drilling liquid technology field, specifically relate to the drilling fluid of a kind of low pressure reservoirs reservoir protection.
Background technology
Gansu Province Dong Youqu oil reservoir belongs to typical case hypotonic, low pressure, low yield " three is low " oil reservoir, Reservoir Protection as an effective well stimulation in low-permeability oilfield development process, Oil Field Measure stable yields, slow down successively decrease in play very important effect.But be as new block constantly find, the increase of new straticulate exploration, the progressively prolongation of development time, increasing reservoir presents that strata pressure is low, go into operation after low yield or the fast feature of production decline rate after going into operation, then how minimum level reduces is crept into middle drilling fluid contamination, how to release the increasingly sophisticated problem of oil layer blocking mechanism, and how to release the restriction of oil reservoir self geologic feature, and then improve reservoir exploitation efficiency, it appears increasingly important.For this problem, propose east, Gansu Province oil head of district more than 8 low pressure reservoir and improve well yield technical research, it is intended to by east, Gansu Province oil head of district more than 8 reservoir geology feature being analyzed research, find out the main cause of different blocks reservoir low-voltage and low-yield, set up transformation thinking, improve measure effect, it is achieved the Efficient Development of low pressure reservoir.
According to reservoir protection requirement of experiment; Qu Longdongyou district prolongs 9, prolongs 10 groups of rock cores; according to oil and gas industry standard SY/T5358-2002 " reservoir sensitivity flowing experiment evaluation methodology "; a series of formation damage evaluatings experiments such as fast quick, water-sensitive, salt are quick, acid-sensitive, alkali is quick, stress sensitivity have been carried out in indoor; two block sensitivity identical points show in essentially on the weak side, and only wooden 34th district show without acid-sensitive.City 77 district is acid-sensitive show as on the weak side, but injury rate is relatively low.Analyzing reason, to be mainly in blowhole cement be calcite.Other sensitivity is on the weak side in being.Data illustrate that fine migration, water-sensitive effect, water-blocking effect are the main causes of formation damage, and presser sensor effect exacerbates the extent of damage and the difficulty overcome.These major determinant factors are all closely related with liquid phase particularly aqueous phase.The intrusion of filtrate is the main inducing causing this oil reservoir seriously to damage.
In exploitation gas reservoir process, one is to try to accomplish without aqueous phase or reduce aqueous phase invaded formation as possible；Two is change aqueous phase character, such as strengthens its inhibition, changes its surface wettability, makes the aqueous phase of intrusion be prone to anti-row, reach the reservoir irreducible water saturation after anti-row close to or equal to original water saturation；Three is avoid particle migration to cause pore throat to block, and effective drainage porosity declines, and reduces solid phase particles invaded formation.Therefore, low pressure reservoirs protection reservoir drilling well (completion) liquid in east, Gansu Province requires over further investigation, and research and development New drilling fluid farthest reduces reservoir damage technical barrier.
Publication number is CN101906290A, publication date is that in December, 2010 Chinese patent literature of 8 days discloses a kind of While-drilling leak resisting and sealing drilling liquid for leakage formation, take 100 parts of clear water by weight, add Caustic soda 1-5 part, soda 1-10 part, polyanion cellulose 3-10 part and sodium bentonite 3-15 part, stir, form base slurry；In base is starched, add GEL USED FOR PLUGGING WELL LOST CIRCULATION 3-10 part, bridging-off agent 3-15 part, asphalt powder 3-10 part while stirring, stir；The present invention is While-drilling leak resisting and sealing drilling liquid for leakage formation, and solid concentration, less than 3%, decreases the injury to oil reservoir.
But with the prior art that above-mentioned patent documentation is representative, the pressure dehydration in drilling fluid cannot be effectively controlled, it is impossible to effectively prevents stratum hydration swelling, thus plugging effect is poor.
Summary of the invention
It is contemplated that defect existing for above-mentioned prior art and deficiency; providing a kind of force feed and hide reservoir protection drilling fluid, it is good that the present invention has plugging effect, the smooth fine and close film-like of mud cake; to the low abundance reservoir Low Damage of low porosity and low permeability, the feature that formula, technique with slurry are simple and easy to do.
The present invention realizes by adopting following technical proposals:
A kind of low pressure reservoirs reservoir protection drilling fluid, it is characterised in that: by weight percentage, component and formula are as follows:
Highly viscous polyanion cellulose: 0.1-0.3%；Sulfonated gilsonite: 0.5-1.0%；Low adhesive aggregation anionic cellulose: 0.1-0.3%；Caustic soda: 0.1%-0.2%；Fluid loss agent: 1-2%；Oil layer protective agent: 2-3%；Hargil: 2%-3%；Surplus is water.
Described oil layer protective agent is polyethenoxy sorbitan list olein.
Described fluid loss agent is hydroxypropyl starch.In addition other fluid loss agents such as hydroxypropyl methyl cellulose is also had to be suitable for.
Compared with prior art, what the present invention reached has the beneficial effect that:
1, the drilling fluid of specific components of the present invention and formula is adopted; experiment through embodiment part; it follows that the fluid loss agent adopted is hydroxypropyl starch; hydroxypropyl starch is by effects such as competitive Adsorption, sequestration, shielding high valence ion, hydrophobic effect and absorption solubilisings; form ultrathin membrane in borehole wall surface, stop drilling fluid filtrate to enter oil reservoir, can make again to be adsorbed on the complete desorption of macromolecule polyalcohol of rock surface simultaneously; and prevent polymer from adsorbing again, thus reach protection reservoir purpose.
2, in this drilling fluid, for low pressure reservoirs stratum characteristic, selected the mode that low adhesive aggregation anionic cellulose combines with hydroxypropyl starch, drilling fluid system can will have been pressed dehydration basic controlling at about 6.0ml.On the basis of this drilling fluid composition; affiliated oil layer protective agent; its formation protection mechanism is that the functional group utilizing self to have generates molecular film (isolating membrane) on the borehole wall, and oil soluble water divided particles can form again shielding under certain pressure reduction and block up temporarily.So that two kinds of oily guarantor's technology organically combine; firmly protective layer is formed in the periphery of the borehole wall; drilling fluid filtrate and pit shaft inner solid particulate phase is prevented to enter reservoir throat; effectively prevent stratum hydration swelling; crack is managed on closure ground layer by layer; prevent the endocorpuscular migration of reservoir, thus being effectively protected oil-gas Layer and providing the borehole condition that engineering construction is necessary.
3, in this drilling fluid, the hydroxypropyl starch adopted is acid washed completely in follow-up acid fracturing process.By the on-the-spot test of Gansu Province Dong Youqu more than 30 mouth test well; result shows: this drilling fluid has very strong seal-off effect; quickly can form tough and tensile, fine and close sealing film with stabilizing borehole at nearly borehole wall band, stop filtrate and solid phase to immerse reservoir further simultaneously, reach effectively to protect the effect of reservoir.
4, highly viscous polyanion cellulose: 0.1-0.3%；Sulfonated gilsonite: 0.5-1.0%；Low adhesive aggregation anionic cellulose: 0.1-0.3%；Caustic soda: 0.1%-0.2%；Fluid loss agent: 1-2%；Oil layer protective agent: 2-3%；Hargil: 2%-3%；Surplus is water.Shown by Indoor Evaluating Experimentation and on-the-spot application result: above component and proportioning can will press dehydration basic controlling at about 6.0ml in drilling fluid system, Marsh funnel viscosity is at more than 50s, and density is at 1.07g/cm3Within, site operation requirement can be met completely, and utilize reservoir protection.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
East, Gansu Province oil head of district more than 8 low pressure reservoirs protection reservoir drilling fluid is prepared by following components; according to percentage by weight clear water weight ratio 90.7%; polyanion cellulose (highly viscous) weight ratio 0.3%; add sulfonated gilsonite weight ratio 0.5%; add polyanion cellulose (low viscous) weight ratio 0.3%, add Caustic soda weight ratio 0.2%, add hydroxypropyl starch weight ratio 2%; adding oil layer protective agent weight ratio 3%, hargil weight ratio 3% is mixed and made into protection reservoir drilling fluid.
Polyanion cellulose (PAC)
PAC, is divided into highly viscous (HV) and low viscous (LV) two kinds ,-can as thickening agent, rheology control agent, binding agent, stabilizer, protecting colloid, suspending agent and water-retaining agent；In oil exploitation industry, PAC is a kind of good treating agent of drilling mud and the material of preparation completion fluid, and mud yield is high, and anti-calcium and anti-salt performance is good.To fresh water mud, seawater mud and saturated salt-water mud, PAC is a kind of well filtrate reducing amount inorganic agent, and has and well put forward viscous ability and high temperature resistance (150 DEG C) ability.It is suitable for preparation fresh water, sea water and saturated brine completion fluid, and increases the weight of the lower completion fluid that can be configured to various density at calcium chloride, and completion fluid can be made to have certain viscosity and relatively low filter loss.
Highly viscous of the present invention or low adhesive aggregation anionic cellulose (PAC) broadly fall into commercially available prod, and the highly viscous produced such as Feicheng Yu Tian Chemical Co., Ltd. and low viscous PAC meet Europe OCMA standard and U.S.'s API standard.
One, the protection reservoir experimental evaluation of embodiment 1 drilling fluid
According to People's Republic of China's Gas Industry standard " SY/T6540-2002 damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ", the damage evaluation of oil reservoir rock core is tested by the drilling fluid system having carried out embodiment 1, and core damage result is in Table 1.It is apparent that low pressure reservoirs protection reservoir drilling fluid is only small to reservoir injury from table 1, average injury rate is 10.46%, belongs to Low Damage drilling fluid.
Two, the key property of embodiment 1 low pressure reservoirs protection reservoir drilling fluid
Wellbore fluid described in this embodiment is tied up to Gansu Province Dong Youqu and has carried out test application.In process of the test, property of drilling fluid data are in Table 3, embodied good test application effect.
1. the protection reservoir drilling and completing fluids system of the research and development application of test respectively in wellblock, city 77 and wooden 34 wellblocks, scene completes test well more than 30 mouth altogether, and by using sulfonated gilsonite and oil layer protective agent composite, density basic controlling is at 1.05-1.06g/cm3, middle pressure dehydration controls at below 6ml, the minimum 5.2mL that can reach, and dynamic speed ratio maintains about 0.4, takes sand good, the thin and smooth fine and close film-like of mud cake, the container horizon protective agent of addition so that this system is lower to the injury rate of reservoir, is beneficial to reservoir protection.Site test results shows, shows very strong stabilizing borehole ability, hole cleaning ability, seal-off effect ability in the test of this drilling fluid system scene, and down-hole, without falling block, without undergauge, without collapsing phenomenon, makes a trip without blocked portion, and setting of casing is smoothly once successfully.
2. this drilling fluid system can effectively protect reservoir; for the checking drilling fluid extent of injury to reservoir, enchashment field drilling fluid sample, the damage evaluation having carried out 3 blocks of rock cores is tested; injury condition is: at simulation bottom hole temperature (BHT) 60 DEG C and confined pressure 5.5MPa, injures 2 hours when intrinsic pressure 3.5MPa.Experimental result is in Table 4.
From table 4, it can be seen that three blocks of rock cores of 91-1,86-1 and 9-2-7 of wooden 34 wells evaluated by on-the-spot drilling fluid, resume permeability rate value is 85.47%, 79.86% and 88.13% respectively, and injury rate is 14.53%, 20.14% and 11.83% respectively.Average injury rate is 15.51%, belongs to Low Damage scope.After rock core after injury takes out from core holding unit, it has been found that have very thin filter cake on injury face, filter cake most surface forms the film of densification, and drilling fluid extreme pressure film-strength is high, is also especially advantageous for reducing frictional resistance and moment of torsion while protection reservoir.
3. formation testing Comparative result is analyzed
(1) wellblock, city 77
As can be seen from Table 5,26-12 day oil-producing in test well city is 11.4m3, compared to the non-test well city 25-13A in same well site, reservoir protection effect is obvious, obtains good effect.
As can be seen from Table 6, test well city 26-12 is higher compared to facing well site non-test well daily oil production, and reservoir protection effect is notable.
(2) wooden 34 wellblocks
We have carried out substantial amounts of on-the-spot test at wooden 34 blocks, from the formation testing result of statistics at present it can be seen that the daily oil production of test well is apparently higher than the daily oil production of non-test well, especially it should be noted that the daily oil production of test well wood 25-01 is up to 38.1m3/ d, has reached the highest daily oil production of wooden 34 blocks, and even above the daily oil production of some horizontal wells of this block, this formation testing result has absolutely proved that the reservoir protection effect that we carry out is notable again, it should widely applies and promotes.
4. the formula of this drilling fluid system is simplified, and low cost trend is obvious, and extemporaneous preparation, service procedure are easy, workable, carry out drilling fluid and completion fluid technological reserve for lower Bu Longdongyou district low pressure reservoirs reservoir protection.
Embodiment 2
Low pressure reservoirs reservoir protection drilling fluid is prepared by following components; according to percentage by weight clear water weight ratio 91.5%; polyanion cellulose (highly viscous) weight ratio 0.1%; add sulfonated gilsonite weight ratio 0.5%; add polyanion cellulose (low viscous) weight ratio 0.2%, add Caustic soda weight ratio 0.2%, add hydroxypropyl starch weight ratio 2.0%; adding oil layer protective agent weight ratio 2.5%, hargil weight ratio 3% is mixed and made into low pressure reservoirs reservoir protection drilling fluid.
Embodiment 3
Low pressure reservoirs reservoir protection drilling fluid is prepared by following components; according to percentage by weight clear water weight ratio 91.2%; polyanion cellulose (highly viscous) weight ratio 0.3%; add sulfonated gilsonite weight ratio 0.5%; add polyanion cellulose (low viscous) weight ratio 0.3%, add Caustic soda weight ratio 0.2%, add hydroxypropyl starch weight ratio 1.5%; adding oil layer protective agent weight ratio 3.0%, hargil weight ratio 3% is mixed and made into low pressure reservoirs reservoir protection drilling fluid.
In the application of embodiment 2,3, this system shows equally and drops dehydration effect, and plugging effect and lubrication drag reduction are respond well, hole stability in drilling process, at the bottom of the smooth lower going-into-well of Completion Operations middle sleeve.
Claims (1)
1. a low pressure reservoirs reservoir protection drilling fluid, it is characterised in that: by weight percentage, component and formula are as follows:
Highly viscous polyanion cellulose: 0.1-0.3%；Sulfonated gilsonite: 0.5-1.0%；Low adhesive aggregation anionic cellulose: 0.1-0.3%；Caustic soda: 0.1%-0.2%；Fluid loss agent: 1-2%；Oil layer protective agent: 2-3%；Hargil: 2%-3%；Surplus is water；
Described oil layer protective agent is polyethenoxy sorbitan list olein；
Described fluid loss agent is hydroxypropyl starch.
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| CN103725272B (en) * | 2014-01-16 | 2015-03-04 | 中国地质大学（武汉） | Water-based drilling fluid for stabilizing shale |
| CN109439295A (en) * | 2018-12-07 | 2019-03-08 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of seawater base clean type drilling fluid |
| CN110231268B (en) * | 2019-05-31 | 2022-07-22 | 大庆油田有限责任公司 | Method for analyzing oil-water occurrence pore size distribution of rock of tight reservoir |
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| EP1358233B1 (en) * | 2000-12-08 | 2008-12-03 | Hercules Incorporated | Polymeric fluid loss additives and method of use thereof |
| CN101864283A (en) * | 2009-12-11 | 2010-10-20 | 中国石油集团钻井工程技术研究院 | Water-based drilling fluid composition containing amine compound |
| CN102559155A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司 | Strong-inhibition efficient shielding temporary plugging protection reservoir drilling fluid and preparation method thereof |
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Patent Citations (3)
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| EP1358233B1 (en) * | 2000-12-08 | 2008-12-03 | Hercules Incorporated | Polymeric fluid loss additives and method of use thereof |
| CN101864283A (en) * | 2009-12-11 | 2010-10-20 | 中国石油集团钻井工程技术研究院 | Water-based drilling fluid composition containing amine compound |
| CN102559155A (en) * | 2011-12-13 | 2012-07-11 | 中国石油集团川庆钻探工程有限公司 | Strong-inhibition efficient shielding temporary plugging protection reservoir drilling fluid and preparation method thereof |
Non-Patent Citations (2)
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