CN105295872A - Drilling fluid suitable for compact sandstone reservoir - Google Patents
Drilling fluid suitable for compact sandstone reservoir Download PDFInfo
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- CN105295872A CN105295872A CN201410341332.6A CN201410341332A CN105295872A CN 105295872 A CN105295872 A CN 105295872A CN 201410341332 A CN201410341332 A CN 201410341332A CN 105295872 A CN105295872 A CN 105295872A
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Abstract
The invention provides a drilling fluid suitable for a compact sandstone reservoir. The drilling fluid comprises the following components by mass percent: 0.5-2 percent of bentonite, 0.5-2.5 percent of a encapsulating/inhibiting agent, 0.5-1 percent of a flow pattern regulator, 3-4 percent of a fluid loss additive, 0.4-0.8 percent of an anti-water-blocking agent, 4-10 percent of a temporary plugging agent, 40-50 percent of LRID, 0-50 percent of a weighting agent and the balance of water. The drilling fluid has the density of 1.16 g/cm<3>-1.55 g/cm<3>. The drilling fluid suitable for the compact sandstone reservoir can effectively prevent the compact sandstone reservoir from pollution and ensure safe downhole operation.
Description
Technical field
The present invention relates to a kind of drilling fluid for petroleum drilling engineering, particularly a kind of drilling fluid of Low permeability and competent sand reservoir, belongs to technical field of petroleum extraction.
Background technology
The ratio of hydrocarbon resources in hyposmosis tight sand in China's hydrocarbon resources constantly expands, widely distributed, but the exploitation difficulty of hydrocarbon resources is large here, and the good sustainable and stable development tool of this kind of hydrocarbon-bearing pool to China Petroleum of exploitation is of great significance.
Sandstone Gas Reservoir generally has the feature in high water sensitivity, heavily stressed susceptibility, high capillary pressure, High water cut saturation ratio and low hole, hypotonic, crack.In oil gas well drilling process, the infringement ubiquity of hyposmosis compact reservoir, sometimes even quite serious, thus greatly constrain the raising of tight sand oil-gas exploration and development state of the art, probing that is safe, that realize compact reservoir quickly and efficiently shoulders heavy responsibilities.In the drilling operation of compact reservoir; drilling and completing fluids is the entry well fluid first contacting reservoir; be the first ring of reservoir protection work be also a most important ring, therefore, the quality of drilling and completing fluids quality and success are explored, the hypotonic compact reservoir of Efficient Development is closely bound up.
Traditional water base drilling fluid system, frequent use wilkinite is with slurry, and regulate the density of drilling fluid system as density adjuster with solid phase particles such as ground barium sulfates, therefore, this kind of drilling fluid system has higher solid load usually, however solid phase particles in drilling fluid especially the clay particle of high dispersive be easy to invade reservoir, reservoir is damaged, the rate of permeation of reservoir is reduced greatly, thus oil and gas production is sharply declined.
Therefore, provide a kind of for compact reservoir and can protect reservoir and the drilling fluid with temperature resistance ability is this area problem demanding prompt solution.
Summary of the invention
In order to solve the problem; the object of the present invention is to provide a kind of drilling fluid being applicable to Sandstone Gas Reservoir, this drilling fluid has anti-collapse, anti-sticking ability preferably, can meet the requirement of protection reservoir; and high-temperature resistance is strong, can guarantee that wellbore construction job safety is carried out fast.
In order to achieve the above object, the invention provides a kind of drilling fluid being applicable to Sandstone Gas Reservoir, by percentage to the quality, the composition of this drilling fluid comprises: the wilkinite (preferably meeting the wilkinite of GB GB/T5005-2010 drilling well level wilkinite standard) of 0.5%-2%, suppressed dose of the bag of 0.5%-2.5%, the flow pattern regulator of 0.5%-1%, the fluid loss agent of 3%-4%, the Waterproof lock agent of 0.4%-0.8%, the temporary plugging agent of 4%-10%, the biological polyalcohols salt (LRID) of 40%-50%, the weighting agent of 0%-50%, surplus is water, the density of this drilling fluid is 1.16g/cm
3-1.55g/cm
3.
According to specific embodiment of the invention scheme, the above-mentioned drilling fluid being applicable to Sandstone Gas Reservoir regulates its density by adding weighting agent.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, in the total mass of described biological polyalcohols salt for 100wt%, the composition of the biological polyalcohols salt adopted comprises: the water of the sodium formiate of the ethylene glycol of the Sorbitol Powder of 2.7%-15.1%, the glycerine of 5.8%-8.7%, 2.4%-3.7%, the propylene glycol of 0.5%-1.7%, the butyleneglycol of 3.6%-5.5%, polymeric alcohol JLX, 6.0%-6.5% of 11.2%-27.5%, the sodium acetate of 5.9%-7.2%, the Sodium.alpha.-hydroxypropionate of 20.0%-23.4% and 18.5%-24.1%.
According to specific embodiment of the invention scheme, preferably, in the total mass of biological polyalcohols salt for 100wt%, biological polyalcohols salt of the present invention can comprise following concrete composition: the Sorbitol Powder of 2.7%, the glycerine of 5.8%, 2.4% ethylene glycol, 0.5% propylene glycol, 5.5% butyleneglycol, 27.5% polymeric alcohol JLX, 6.5% sodium formiate, the sodium acetate of 7.2%, the Sodium.alpha.-hydroxypropionate of 23.4% and 18.5% water.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, described biological polyalcohols salt is produced by starch biochemical process, and preferably, it is obtained that described biological polyalcohols salt is through following steps:
First by starch through amylorrhexis, then under the effect of catalyzer (Nickel Aluminium Alloy Powder), carry out hydrogenation reaction, finally carry out the step of hydrocracking.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the main component of biological polyalcohols salt adopted is the organic salt of the organic salt of dibasic alcohol, the organic salt of polyvalent alcohol or polyvalent alcohol and Sodium.alpha.-hydroxypropionate or poly(lactic acid) sodium, this one-tenth is grouped into and makes biological polyalcohols salt have cloud point, clay absorption moisture and foreign particle not only can be effectively stoped to invade hydrocarbon zone, reduce the formation damage caused because of pore throat blocking, and can return smoothly under the effect returning row pressure power and eject, thus be conducive to the recovery of hydrocarbon zone rate of permeation.The restraining effect of biological polyalcohols salt also has certain long-lasting, can prevent the situation affecting rejection because of washing away of resident fluid slug formation hole from occurring.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, suppressed dose of the bag adopted wraps by force suppressed dose for high molecular weight salt-resistant monomer, more preferably, suppressed dose of the bag of employing is bag suppressed dose of IND10 (being produced by Beijing Pei Kangjia industry Technology Dev Company Ltd.); Wherein, wrap suppressed dose of IND10 be by vinyl monomer, containing the molecular weight of sulfonic vinyl monomer copolymerization be 1,000,000-500 ten thousand polymkeric substance.In suppressed dose of above-mentioned bag, in order to the inhibition being applicable to the drilling fluid of Sandstone Gas Reservoir described in improving further can add polyamine polymer, suppressed dose of IND10 will be wrapped and polyamine polymer is composite rear as wrapping suppressed dose.
According to specific embodiment of the invention scheme, above-mentioned bag suppressed dose of composite polyamine polymer of IND10 forms suppressed dose of bag, and concrete compound process is conveniently composite to be operated.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the flow pattern regulator of employing comprises xanthan gum XC and/or tackifier 80A51; Specifically used as flow pattern regulator separately by xanthan gum XC or to use composite for xanthan gum XC and tackifier 80A51 as flow pattern regulator afterwards, when the two uses after composite, concrete compound process conveniently composite operation carries out; The effect of flow pattern regulator is the suspension, the large rock-carrying ability that improve described drilling fluid.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the fluid loss agent adopted comprises Redu1 (being produced by Beijing Pei Kangjia industry Technology Dev Company Ltd.), sulfonated phenolic resin SMP-II and the non-fluorescence collapse-proof fluid loss agent KH-931 that mass ratio is 1:2:2, use as fluid loss agent after above-mentioned three kinds of material compounded combination, concrete compound process conveniently composite operation carries out.
According to specific embodiment of the invention scheme; use using Redu1, sulfonated phenolic resin SMP-II and non-fluorescence collapse-proof fluid loss agent KH-931 compounded combination as fluid loss agent; can ensure that described drilling fluid has as far as possible low filter loss; thus reduce the infringement of water-sensitive, water lock, reach the object of protection reservoir.Wherein, Redu1 be containing the molecular weight of the graft copolymerization such as sulfonic vinyl monomer, vinyl monomer and Mierocrystalline cellulose be 500,000-200 ten thousand polymkeric substance; Sulfonated phenolic resin SMP-II introduces sulfonic group on benzene ring units, and be connected to form with carbon atom again between phenyl ring; Non-fluorescence collapse-proof fluid loss agent KH-931 is by grafting allyl monomer polymer formation on natural modified material.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the Waterproof lock agent adopted comprises drilling fluid Waterproof lock agent HAR-D and (is produced by Hubei Hanke Hi-Tech Co., Ltd., meet Q/JHK211-2009 standard), wherein, HAR-D is for reducing the reasonable polymkeric substance of surface and interface ability.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the temporary plugging agent of employing comprises bridge particle, particle filled composite and deformable particles;
Wherein, described bridge particle and particle filled composite are calcium carbonate granule, and bridge particle plays support frame, and particle filled composite plays fills macroporous effect; Be calculate according to stratum Pore throat size as the particle size range of the calcium carbonate granule of bridge particle and particle filled composite and compound proportion, there is no fixing ratio.The reference of concrete principle and method is (Master degree candidate's Diplomarbeit " the western regional mechanism of reservoir damage of dragon and sfgd. research " of Northeast Petroleum University; Xie Yuning; 2012); such as; a certain stratum can with 200 orders and 1000 orders, two kinds of calcium carbonate granules composite; also can be composite with 100 orders, 500 orders and 2000 orders, three kinds of calcium carbonate granules, but compound proportion is different, because the particle diameter of often kind of order number particle is continuous distribution.
Described deformable particles comprises the unstressed configuration albino bitumen NFA-25 (being produced by Beijing Pei Kangjia industry Technology Dev Company Ltd.) and polymeric alcohol JLX with softening temperature;
Described bridge particle and the total addition of particle filled composite for described in be applicable to the 3%-4% of the drilling fluid total mass of Sandstone Gas Reservoir, the addition of described deformable particles for described in be applicable to the 3%-4% of the drilling fluid total mass of Sandstone Gas Reservoir.
According to specific embodiment of the invention scheme, representative rock sample is selected to test, measure Pore throat size and the distribution of reservoir, then according to the compound proportion of calcium carbonate in ID filling principle determination temporary plugging agent, in order to pore throat of all sizes in shutoff reservoir effectively and the hole that formed between stifled particle temporarily, require that the temporary plugging agent particle added has the distribution of Continuous Particle Size sequence.
Above-mentioned ID filling principle namely when the maximum pore throat diameter of the maximum value of temporary plugging agent particle on its particle-size accumulation distribution curve and reservoir or maximum crack width equal time, the most stifled effect can be obtained.In " square root of cumulative volume %-pore throat diameter " coordinate diagram; using the line between maximum pore throat point and initial point as baseline; if the integral distribution curve of composite temporary plugging agent grain diameter coincides with baseline, then the deposition efficiency of particle is the highest, and reservoir protection effect is best.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, preferably, the weighting agent of employing comprises Wingdale, barite or spathic iron ore.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention adopts conventional preparation method to obtain.
The present invention, by adopting the biological polyalcohols salt with certain viscosity as the main treating agent of described drilling fluid, because biological polyalcohols salt has certain viscosity, decreases bentonitic content to reduce the mutual injury between solid phase.And the density of biological polyalcohols salt can reach 1.38g/cm
3, in equal densities situation, decrease the addition of conventional weighting agent, decrease the injury of solid phase to reservoir.In addition, biological polyalcohols salt can reduce the filtrate activity of described drilling fluid, stops water molecules to permeate to mud shale, thus serves the effect of stable well.
Above-mentioned biological polyalcohols salt has stronger temperature resistance ability, and at 150 DEG C, high-temperature hot is rolled the constant and resistivity of cooled density and can be met logging requirements, viscosity have certain reduction but the later stage basicly stable, after high temperature, still there is good oilness.
Below by way of doing the experiment of landwaste secondary returning yield, the inhibition of biological polyalcohols salt is evaluated.
The landwaste of experiment takes from the drilling cuttings of two Souths, Liaohe Oil Field block dune shape, through air-dry, sieve, weigh after soak and form, treatment agent solution selects water, drilling fluid coating agent (PAC141), shale inhibitor polyether glycol (SYP-1), Na respectively
2siO
3, polyacrylamide sylvite (KPAM), potassium humate (KHm) and biological polyalcohols salt, experimental result is in table 1.
The inhibition evaluation experimental result of the biological polyalcohols salt of table 1
Known by table 1, mass percent be 3% biological polyalcohols salt there is the higher landwaste rate of recovery, particularly secondary returning yield is higher, even suitable with potassium humate (KHm) with conventional shale inhibitor polyether glycol (SYP-1), show that it has good suppression shale expansion effect.Concentration is that in the biological polyalcohols salt of SYP-1 with 3wt% of KHm, 3wt% of 3wt%, landwaste is relative complete, has almost no change.Visible, the absorption of biological polyalcohols salt on mud shale is very firm, has the feature of strong absorption, high inhibition, is conducive to the stable of the borehole wall in drilling process.
The code name of the drilling fluid treatment agent being applicable to the various models adopted in the drilling fluid of Sandstone Gas Reservoir provided by the invention to be the code name of industry universal be a bit a bit producer, such as: HAR-D is the model of the Waterproof lock agent that Hubei Chinese section produces, unstressed configuration albino bitumen NFA-25, fluid loss additive for boring fluid Redu1, drilling fluid strong bag suppressed dose of IND10 is produced by Beijing Pei Kangjia industry Technology Dev Company Ltd., XC, 80A51, SMP-II, KH-931, JLX, PAC141, SYP-1, KPAM, KHm, PAM, HPAN, KFT, PA-1, SF-1, SF-4, the treatment agent of the models such as NH-1 is all the treatment agent with identical or different performance of conventional drilling fluid, the treatment agent of the above-mentioned model that different manufacturer produces all can realize technical scheme of the present invention.
The drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention, compared with existing drilling fluid, has the following advantages:
1, the main treating agent (biological polyalcohols salt) of drilling fluid provided by the invention itself has good lubricity, not only can reduce frictional force, traditional lubrication agent can also be avoided the injury of reservoir;
2, in drilling fluid provided by the invention, the addition of biological polyalcohols salt is 40wt%-50wt%, and in drilling fluid, bentonitic content only has the 10wt%-35wt% of conventional drilling liquid simultaneously, greatly can improve the high-temperature resistance of drilling fluid; Introduce fluid loss agent, wrap suppressed dose, flow pattern regulator etc., drilling fluid provided by the invention can be made in high temperature deep well, to keep good flow pattern, stronger structural, to ensure the suspension of drilling cuttings and to carry.
3, drilling fluid preparation of the present invention is simple, and easy to maintenance, the feature of environmental protection is good, preferentially can promote the use of in low solid phase or clay-free drilling fluid system.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of drilling fluid being applicable to Sandstone Gas Reservoir, the density of this drilling fluid is about 1.16g/cm
3by mass percentage, it comprises: the wilkinite of 0.5%, 0.6% high inhibition coating agent IND10 (vinyl monomer, polymkeric substance) containing the higher molecular weight of sulfonic vinyl monomer copolymerization, 0.6% polyamine polymer NH-1,0.5% xanthan gum XC, 1.5% Redu1,1.5% non-fluorescence collapse-proof fluid loss agent KH-931,0.4% HAR-D, 3% compound calcium carbonate (the rock core principal permeability according to evaluating is 132.2 × 10
-3μm
2by calculating, mass ratio is selected to be the 3000 object calcium carbonate granules of 60:15:25,800 object calcium carbonate granules and 400 object calcium carbonate granules, carry out composite as bridge particle and particle filled composite), 2% unstressed configuration albino bitumen NFA-25,2% the biological polyalcohols salt of polymeric alcohol JLX and 50%, surplus is water.
The above-mentioned drilling fluid being applicable to Sandstone Gas Reservoir conveniently preparation method obtains.
The main component of above-mentioned biological polyalcohols salt comprises: the Sorbitol Powder of 2.7%, the glycerine of 5.8%, 2.4% ethylene glycol, 0.5% propylene glycol, 5.5% butyleneglycol, 27.5% polymeric alcohol, 6.5% sodium formiate, the sodium acetate of 7.2%, the Sodium.alpha.-hydroxypropionate of 23.4% and 18.5% water.
The present embodiment additionally provides the inhibition contrast experiment of the above-mentioned drilling fluid for Sandstone Gas Reservoir, and temperature resistance, antipollution are tested, and reservoir protection effect assessment is tested, and further illustrates the premium properties of the drilling fluid that the present embodiment provides.
1, inhibition contrast experiment
The above-mentioned drilling fluid being applicable to Sandstone Gas Reservoir is carried out inhibition contrast experiment, specifically the wilkinite of 100g is added in the distilled water of 15mL, puddle evenly, load in sample suppressor, add the pressure precompressed 3min of 5MPa, then backing plate is taken off and lining paper is slowly forced into 15MPa, voltage stabilizing 1min, then the sample suppressed is taken out, different drilling fluids (as shown in table 1) is put into after drying, take out after leaving standstill 90min after sample blots the liquid on surface and weigh, the change of twice sample quality before and after contrast, result is as shown in table 2.
The composition of the sulphonated polymer mud used in the present embodiment comprises: the sulfonated phenolic resin SMP-II of sulfonated gilsonite SAS, 2wt% of valchovite SPNH, 2wt% of polyacrylamide PAM and 1.5wt% of the soda ash of 0.5wt%, the bentonite in powder of 5wt%, 0.3wt% and the potassium humate KHm of 2wt%, surplus is water.
The composition of the KCl polymkeric substance drilling well used comprises: the molecular weight of KCl, 0.2wt% of the soda ash of 0.5wt%, the bentonite in powder of 5wt%, 7wt% is the tackifier 80A51 of unstressed configuration albino bitumen NFA-25 and 0.3wt% of non-fluorescence collapse-proof fluid loss agent KH-931,1wt% of NaOH, 1wt% of complex ionic polyacrylate PAC141,0.2wt% of 1,000,000-200 ten thousand, and surplus is water.
The composition of the silicone drilling fluid used comprises: the sulfonated phenolic resin SMP-II of non-fluorescence collapse-proof fluid loss agent KH-931,1wt% of the organosilicon stablizer of the soda ash of 0.5wt%, the bentonite in powder of 5wt%, 1wt%, the organic silicon diluent of 1wt%, 1wt% and the tackifier 80A51 of 0.3wt%, surplus is water.
The composition of the polysilica-fluoride drilling fluid used comprises: the fluosilicic stablizer SF-4 of fluosilicic viscosity-depression agent SF-1 and 1wt% of unstressed configuration fluid loss agent PA-1,1wt% of anti-sloughing agent KFT, 2wt% of polyacrylonitrile HPAN, 3wt% of polyacrylamide PAM, 2wt% of the soda ash of 0.5wt%, the bentonite in powder of 5wt%, 0.5wt%, surplus is water.
The parameter of table 2 different drilling fluid inhibition contrast experiment
| Drilling fluid | Water regain/the g of 90min |
| Sulphonated polymer mud | 9.66 |
| Clear water | Disintegrate completely |
| KCl polymer drilling fluid | 6.76 |
| Silicone drilling fluid | 12.43 |
| Polysilica-fluoride drilling fluid | 8.62 |
| The drilling fluid that the present embodiment provides | 4.77 |
As can be seen from Table 2, contrast other several drilling fluids, at the clay block being applicable to soak in the drilling fluid of Sandstone Gas Reservoir with biological polyalcohols salt that the present embodiment provides, the water regain of sample is very little, illustrate that the drilling fluid that the present embodiment provides has good inhibition, be conducive to the long-term stability of the borehole wall.
2, temperature resistance, antipollution experiment
Temperature resistance, antipollution experiment are carried out to the above-mentioned drilling fluid being applicable to Sandstone Gas Reservoir, the change of its performance of test after specifically heat rolls 24h at 160 DEG C by above-mentioned drilling fluid, and 3 kinds of pollutents (water, soil, cement) are joined in the drilling fluid that the present embodiment provides with certain concentration gradient, the temperature resistance of the drilling fluid provided to check the present embodiment, contamination resistance.
As can be known from Table 3, the drilling fluid that the present embodiment provides Performance comparision after high temperature and pollution is stablized, and the change of viscosity, yield value and fluid loss is little, has good high temperature resistance and contamination resistance.
The drilling fluid temperature resistance that table 3 the present embodiment provides, contamination resistance contrast experiment parameter
3, reservoir protection effect assessment experiment
The experiment of reservoir protection effect assessment is carried out to the above-mentioned drilling fluid being applicable to Sandstone Gas Reservoir, utilizes DW-II High Temperature High Pressure dynamically to pollute instrument and carry out evaluation experimental.Specifically choose the rock core of 4 kinds of different rate of permeation respectively, according to CNPC industry standard SY/T6540-2002 (damage of drilling fluid and completion fluid oil reservoir indoor evaluation method), measure the permeability resume figure of the contaminated rear rock core of drilling fluid that embodiment 1 provides, result is as shown in table 4.Experiment condition: temperature is 120 DEG C, pressure reduction is 2MPa, and confined pressure is 3MPa, and the drilling fluid contamination time is 0.5h.
Table 4 reservoir protection effect assessment result
Core permeability recovery value is all more than 84.9% as can be seen from Table 4; the shield ring of visible formation fully can stop that solid phase particles in drilling fluid and filtrate enter hydrocarbon zone; illustrate that the infringement of drilling fluid to reservoir that the present embodiment provides is low, there is good reservoir protection effect.
Embodiment 2
Three of the drilling fluid being applicable to Sandstone Gas Reservoir that embodiment 1 provides by the present embodiment two 233 wells in Liaohe Oil Field are opened dune shape and are carried out rig-site utilization experiment.
Group company of Shuan233Jing Shi PetroChina Company Limited. is arranged in a bite risk prospect pit of Liaohe Depression western sag, and the object of this well probing is implement the oily situation of two 602 southern block dune shape (Es3) sand bodies.Because this well is prospect pit; dune shape is again the special Low permeability and competent sand reservoir in typical low hole; this reservoir is also that drilling failure easily sends out well section simultaneously; and clay mineral content is relatively high; reservoir sensitivity partially by force and easily Water-blocking damage occurs, therefore in operation process to the protection of hydrocarbon zone with guarantee that downhole safety seems very important.
Two 233 wells from 3589.79m deeply carry out three spud in into, get into well depth 4129m finishing drilling, the maximum hole deviation of this well is 32.7 degree, and horizontal shift is 1530m.Along with the increase of well depth, hole deviation and when wellbore trajectory is bad in creeping into, supplement bag suppressed dose, temporary plugging agent in time, and add the addition of mcroorganism polyalcohols salt.Normal pressure and temperature filter loss <3mL in strict control in operation process, high temperature and high pre ssure filtration <11mL, strengthen solids control simultaneously and keep low bentonite content (0.5wt%-2wt%), funnel viscosity maintains 46s-77s.
Result shows; the drilling fluid of Sandstone Gas Reservoir that what embodiment 1 provided be applicable to meets lubricate and sticking control; the requirements such as safety drilling, well logging, well logging; in formation testing, output compares offset well raising about 50%; prove that the drilling fluid being applicable to Sandstone Gas Reservoir provided by the invention has advantage that is effective to reservoir protection, strong inhibition capability, and provide reference for tight sand wellbore construction.
Claims (10)
1. one kind is applicable to the drilling fluid of Sandstone Gas Reservoir, by percentage to the quality, the composition of this drilling fluid comprises: the wilkinite of 0.5%-2%, suppressed dose of the bag of 0.5%-2.5%, the flow pattern regulator of 0.5%-1%, the fluid loss agent of 3%-4%, the Waterproof lock agent of 0.4%-0.8%, the temporary plugging agent of 4%-10%, the biological polyalcohols salt of 40%-50%, the weighting agent of 0%-50%, surplus is water, and the density of this drilling fluid is 1.16g/cm
3-1.55g/cm
3.
2. drilling fluid according to claim 1, it is characterized in that, in the total mass of described biological polyalcohols salt for 100wt%, the composition of described biological polyalcohols salt comprises: the water of the sodium formiate of the ethylene glycol of the Sorbitol Powder of 2.7%-15.1%, the glycerine of 5.8%-8.7%, 2.4%-3.7%, the propylene glycol of 0.5%-1.7%, the butyleneglycol of 3.6%-5.5%, polymeric alcohol JLX, 6.0%-6.5% of 11.2%-27.5%, the sodium acetate of 5.9%-7.2%, the Sodium.alpha.-hydroxypropionate of 20.0%-23.4% and 18.5%-24.1%.
3. drilling fluid according to claim 1, is characterized in that, suppressed dose of described bag is bag suppressed dose of IND10.
4. drilling fluid according to claim 3, is characterized in that, described bag suppressed dose of IND10 be by vinyl monomer, containing the molecular weight of sulfonic vinyl monomer copolymerization be 1,000,000-500 ten thousand polymkeric substance.
5. drilling fluid according to claim 1, is characterized in that, described flow pattern regulator comprises xanthan gum XC and/or tackifier 80A51.
6. drilling fluid according to claim 1, is characterized in that, described fluid loss agent comprises Redu1, sulfonated phenolic resin SMP-II and the non-fluorescence collapse-proof fluid loss agent KH-931 that mass ratio is 1:2:2.
7. drilling fluid according to claim 6, is characterized in that, described Redu1 be containing the molecular weight of sulfonic vinyl monomer, vinyl monomer and Graft Copolymerization of Cellulose be 500,000-200 ten thousand polymkeric substance.
8. drilling fluid according to claim 1, is characterized in that, described Waterproof lock agent comprises HAR-D.
9. drilling fluid according to claim 1, is characterized in that, described temporary plugging agent comprises bridge particle, particle filled composite and deformable particles;
Wherein, described bridge particle and particle filled composite are calcium carbonate granule;
Described deformable particles comprises unstressed configuration albino bitumen NFA-25 and polymeric alcohol JLX;
Described bridge particle and the total addition of particle filled composite for described in be applicable to the 3%-4% of the drilling fluid total mass of Sandstone Gas Reservoir, the addition of described deformable particles for described in be applicable to the 3%-4% of the drilling fluid total mass of Sandstone Gas Reservoir.
10. drilling fluid according to claim 1, is characterized in that, described weighting agent comprises Wingdale, barite or spathic iron ore.
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