CN103525383B - Filming drilling fluid being applicable to coal bed gas well and preparation method thereof - Google Patents
Filming drilling fluid being applicable to coal bed gas well and preparation method thereof Download PDFInfo
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- CN103525383B CN103525383B CN201310485959.4A CN201310485959A CN103525383B CN 103525383 B CN103525383 B CN 103525383B CN 201310485959 A CN201310485959 A CN 201310485959A CN 103525383 B CN103525383 B CN 103525383B
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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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- 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
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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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
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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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
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
Abstract
The invention discloses a kind of filming drilling fluid being applicable to coal bed gas well and preparation method thereof, filming drilling fluid comprises the component of following mass percent: carry stick 0.1 ~ 0.3%; Membrane-forming agent 2.0 ~ 5.0%; Flocculant 0.1 ~ 0.3%; Plugging agent 0.2 ~ 5.0%; Plugging agent 1.0 ~ 10.0%; Alkalinity regulator 0.05 ~ 0.2%; Surplus is water.Adopt the present invention can form rapidly the plugged zone of a hyposmosis at coal petrography pore throat place, play and stop fluid or solid phase enters coal seam, effectively to stop, slowing down fluid leakage, prevent easy hydrate matter in coal rock cleat and crack from expanding, disperse and pollution reservoir.
Description
Technical field
The present invention relates to a kind of filming drilling fluid being applicable to coal bed gas well and preparation method thereof, be applicable to coal bed gas well and there is large space and the high leakiness stratomere of rate of permeation, be also applicable to the sandstone formation operation that Reservoir Section rate of permeation is higher.
Background technology
China's coal bed gas resource is very abundant, but the CBM exploration and development of China is also in the starting stage at present.Along with deepening continuously of cbm development, during drilling well, coal seam borehole wall stability and coal seam section reservoir protection problem become increasingly conspicuous, serious restriction coal-seam gas mass-producing exploitation and operation.If there is down-hole complex accident when coal petrography section is crept into, not only can incur loss through delay job schedule and also can cause great financial loss.
Because coal seam has special rock property, cbm development is also made a big difference compared with other conventional gas and oil fields.
(1) chemical aspect: dissimilar water-base drilling fluid filtrate enters coal seam, all makes the ultimate compression strength of coal petrography and tensile strength reduce.Filtrate enters the microfracture in coal seam under the effect of pressure reduction, and the pressure of generation can strut crack, destroys coal petrography.After the filtrate in drilling fluid enters coal petrography, the clay mineral in the microfracture of coal seam can absorb water generation hydration swelling, and simultaneously because the centre of coal petrography is often mingled with charcoal mudrock or the very high ickings inferior of shale index, these compositions have very strong susceptibility to water.These composition water-absorbents are strong, and exist and expand or Swelling, the effect of water can change original stress equilibrium, thus loses original stability, and hydration swelling causes stress raisers, causes coal seam to peel off and caves in.
(2) terms of mechanics: from amechanical angle, hole instability can be divided into slump in and formation fracture two kinds of situations.Coal seam microfracture is grown, coal petrography Young's modulus little compared with sandstone, shale (20000 ~ 30000, coal petrography only has 5000 to sandstone), and Poisson's ratio is large; Original stress equilibrium can be changed under the effect of external force, thus lose original stability, cause borehole well instability and collapse.
In wellbore construction, drilling fluid filtrate and various solid phase particles, under the effect of fluid column pressure, enter cracks in coal seam or hole, and blocking coal seam gas passage, severe patient causes borehole well instability, causes production capacity to reduce, directly affects later development.Therefore, there is following limitation in the additive for drilling fluid product improving stratum anti-pressure ability (protection reservoir is stablized) at present:
(1) most drilling fluid materials has potential injury to payzone; (2) plugging strength is not high, may be leaked in drilling well because pressure reduction is too high by pressure; (3) reinforcement effect is not had to unconsolidated formation; (4) although also there is portioned product can form film plugging structure, membrane structure is single, and the effect for raising stratum anti-pressure ability is not clearly; (5) characteristic that conventional material is hydrophilic forms mud cake in nearly borehole wall area, and stop that fluid enters, but coal seam lipophilicity is strong, the mud cake quality that conventional material cannot form mud cake or formation is poor.
In addition, China Patent No. " 200610165821.6 " discloses a kind of preparation method of high-performance filming water-base drilling fluid system, and publication date is on 06 18th, 2008.The representative formula of the high-performance filming water-base drilling fluid system of its use saline is: the saturated NACL aqueous solution of 10%-+1-3% water retaining+0.3-0.5% polymeric viscosifiers+0.5-1% coating agent+2.5-5% amido shale control agent+3-4% lubricant+7-8% membrane-forming agent.But also there are the following problems for this patent: in filming drilling fluid, the main component of membrane-forming agent is silicate, silicate is strong basicity (general pH is more than 10), coalbed methane reservoir section coal petrography has strong alkali sensitivity, and the too high meeting of pH causes Permeability Oe Coal And Porous Rock And Fractured Rock to reduce and causes damage to reservoir; The main mechanism of action of silicate be its silanol groups by and local water or crack CLAY MINERALS AND THEIR SIGNIFICANCE in calcium ions and magnesium ions effect generate the precipitations such as silanol calcium, because coal petrography is low permeability reservoir, coal petrography itself is reservoir and reservoir, the precipitation meeting shutoff reservoir that silicate generates, causes reservoir permanent injury.In addition, existing filming drilling fluid mainly for be mud shale stratum, the shutoff film-forming properties for coal bearing seams is strong, and mainly because coal petrography lipophilicity is greater than wetting ability, the mud cake quality that existing filming drilling fluid is formed on coal petrography surface is bad or not strong.
Summary of the invention
The object of the invention is to the problems referred to above overcoming the existence of existing drilling fluid, a kind of filming drilling fluid being applicable to coal bed gas well and preparation method thereof is provided, adopt filming drilling fluid of the present invention can form rapidly the plugged zone of a hyposmosis on coal petrography surface and pore throat place, play and stop fluid or solid phase enters coal seam, effective prevention, slowing down fluid leakage, prevent easy hydrate matter in coal rock cleat and crack from expanding, disperse and pollute reservoir.
For achieving the above object, the technical solution used in the present invention is as follows:
Be applicable to a filming drilling fluid for coal bed gas well, it is characterized in that, comprise the component of following mass percent:
Carry stick 0.1 ~ 0.3%;
Membrane-forming agent 2.0 ~ 5.0%;
Flocculant 0.1 ~ 0.3%;
Plugging agent 0.2 ~ 5.0%;
Plugging agent 1.0 ~ 10.0%;
Alkalinity regulator 0.05 ~ 0.2%;
Surplus is water.
The present invention also comprises prehydration slope soil paste, and the mass percentage content of prehydration slope soil paste is 4 ~ 10%.
Described stick of carrying is that Natvosol HEC and carboxyl methyl cellulose are formulated according to the mass ratio of 2:1.
Described stick of carrying is carboxyl methyl cellulose or Polyanionic Cellulose PAC-H.
Described membrane-forming agent is that polyvinyl alcohol (PVA) is formulated in any proportion with at least one in sodium formiate, potassium formiate, organic silicic acid potassium or KCL.
Described flocculant is that polyacrylic acid potassium (K-PAM) and cationic polyacrylamide (CPAM) are formulated according to the mass ratio of 1:1-2.
Described plugging agent be in 325 object calcium carbonate, 1250 object calcium carbonate superfine powders or sulfonated gilsonite one or more according to arbitrary proportion formulated.
Described plugging agent is that individual event pressure plugging agent DF-A and the thick mica of 100 objects or the thin mica of 200 objects are formulated according to arbitrary proportion according to leakage situation.
Described alkalinity regulator is sodium hydroxide.
Be applicable to a preparation method for the filming drilling fluid of coal bed gas well, it is characterized in that, comprise the steps:
A, by mass percentage proportioning: carry stick 0.1 ~ 0.3%; Membrane-forming agent 2.0 ~ 5.0%; Flocculant 0.1 ~ 0.3%; Plugging agent 0.2 ~ 5.0%; Plugging agent 1.0 ~ 10.0%; Alkalinity regulator 0.05 ~ 0.2%; Surplus is water;
B, carry stick, plugging agent, membrane-forming agent and the flocculant of said ratio are added in clear water, be fully uniformly mixed;
C, add the plugging agent of said ratio again, stir and make it fully be uniformly dispersed;
D, pH value is adjusted to not higher than 10, for pH during Reservoir Section not higher than 9 with the alkalinity regulator of said ratio again.
The present invention also comprises the step adding prehydration slope soil paste, and after the plugging agent added is uniformly dispersed, then to add mass percentage content be 4 ~ 10% prehydration slope soil pastes, and mix, then adjust ph is adjusted.
Employing the invention has the advantages that:
One, the present invention is by the mixture that can form the Natvosol HEC of micella, carboxyl methyl cellulose, PVAC polyvinylalcohol and the various polymkeric substance such as cationic polyacrylamide with positive charge and form, the calcium carbonate of the different-grain diameter of preferred raising Formation bearing pressure, when joining in water-base drilling fluid, the calcium carbonate energy crack that shutoff is larger rapidly of different-grain diameter wherein; Polymer aggregational forms " micella ", under overbalance pressure, the plugged zone of a hyposmosis is formed rapidly on coal petrography surface and pore throat place, play and stop fluid or solid phase enters coal seam, effective prevention, slowing down fluid leakage, prevent easy hydrate matter in coal rock cleat and crack from expanding, disperse and pollute reservoir.
Two, the cation surface activating polymkeric substance in the present invention can be adsorbed on coal petrography surface, reduces the electrical of coal petrography surface and surface energy, and being convenient to plugging material can form plugged zone on coal petrography surface; Wherein PVAC polyvinylalcohol is a kind of tensio-active agent, molecular structure has amphipathic, after its water-wet side and clay mineral form physical adsorption, hydrophobic end is then towards drilling fluid, drilling fluid filtrate so just can be stoped to continue to invade mud shale, and the lipophilic group in its molecular structure in coal petrography surface adsorption, can promote that the calcium carbonate in drilling fluid forms mud cake rapidly on coal petrography surface, reduce the intrusion of drilling fluid, thus reach the effect preventing borehole well instability; In drilling fluid, the cationic polyacrylamide of additive at coal petrography surface rapid adsorption, and can act synergistically with plugging material particle, promotes that plugging agent forms on coal petrography surface the intrusion that plugged zone reduces filtrate; Because the film self formed has good snappiness, can also active balance leakage reservoir pressure, decrease that drilling tool removes, in turn on pump process, because of the secondary leakage that surge pressure or suction function cause, ensure that construction is carried out smoothly.
Three, the present invention can utilize the group of himself fast in coal petrography surface adsorption, and final formation has the adsorption film of some strength, there is following characteristics: the micella in (1) drilling fluid have with stratum coupling size distribution, can effectively shutoff stratum microfracture stitch; (2) form rapidly the plugged zone of hyposmosis, stop the further intrusion reservoir of drilling fluid; (3) there is the lipophilic group that can adsorb on coal petrography, can concur with the coal petrography of oleophylic and hydrophilic clay mineral; (4) plugged zone is just present in rock of borehole surface, be not deep into reservoir deep (through the rock core that drilling fluid damage is crossed, after plugged zone end face excision 5mm will be injured, rate of permeation reaches more than 85%), the plugged zone formed can decompose in acid condition, just can be removed completely by the technology such as perforation and acid fracturing in later stage; (5) plugging film has strong bearing capacity (experiment proves that the film anti-pressure ability that this drilling fluid is formed can reach more than 0.7MPa), formation-parting pressure gradient can be made to increase, improve the stability of the borehole wall.Meet to borehole wall stability requirement in the section wellbore construction process of coal bed gas well coal seam, there is again excellent reservoir protection characteristic simultaneously, there is very large use value and potential economic benefit.
Four, the present invention is by the component of following mass percent: carry stick 0.1 ~ 0.3%; Membrane-forming agent 2.0 ~ 5.0%; Flocculant 0.1 ~ 0.3%; Plugging agent 0.2 ~ 5.0%; Plugging agent 1.0 ~ 10.0%; Alkalinity regulator 0.05 ~ 0.2%; Surplus is water; Adopt this proportioning, in the mode of " physics, chemical action combine ", compound closure rete can be formed in solid-liquid interface, meet the application on many cover pressure series of strata, different lithology stratum, and realize the requirement of protection reservoir; And the content of each component is interrelated, wherein the consumption of any one component changes, the consumption of other component all can be caused to change, and the combining property of physics, chemical action can be affected, affect the performance of filming drilling fluid, therefore, aforementioned component and content can not be drawn by limited number of time experiment.
Five, in the present invention, cation surface activating polymkeric substance can utilize the positive charged group of self with negative charge coal petrography surface and coal petrography hole in clay mineral on, prevention fluid further invade; Formate wherein can improve filtrate viscosity, reduces filtrate activity, reduces the invasion depth of fluid; Wherein PVAC polyvinylalcohol is a kind of tensio-active agent, molecular structure has amphipathic, after its water-wet side and clay mineral form physical adsorption, hydrophobic end is then towards drilling fluid, drilling fluid filtrate so just can be stoped to continue to invade mud shale, and the lipophilic group in its molecular structure in coal petrography surface adsorption, can promote that the calcium carbonate in drilling fluid forms mud cake rapidly on coal petrography surface, reduce the intrusion of drilling fluid, thus reach the effect preventing borehole well instability; KCL wherein can play restraining effect to the clay mineral in mud stone and coal petrography, reduces the dispersion of its aquation and the injury caused reservoir of migrating; Natvosol can be formed " micella " in drilling fluid; the plugged zone of a hyposmosis can be formed at pore throat place and crack place; play and stop fluid or solid phase enters coal seam; effective prevention, slowing down fluid leakage; prevent easy hydrate matter expansion, dispersion and pollution reservoir in coal rock cleat and crack from effectively decreasing the solid phase etc. produced in drilling fluid filtrate and drilling process and enter reservoir; improve the bearing capacity of coal seam section; decrease the generation of leakage, ensure that down-hole is stable and protect reservoir.
Six, in the present invention, described stick of carrying is that Natvosol and carboxymethyl cellulose are formulated according to the mass ratio of 2:1, these two kinds of polymkeric substance act synergistically best under this proportioning, it is carried, and sticky to cut plugging effect all more eager to excel in whatever one does than the single dose of equal dosage, size or be less than the mass ratio of 2:1, all can affect synergy.
Seven, in the present invention, described flocculant is that polyacrylic acid potassium and cationic polyacrylamide are prepared according to the mass ratio of 1:1-2, under this proportioning, the synergy for the treatment of agent is best, its flocculation encapsulation action is eager to excel than the single dose of equal dosage, size or be less than the mass ratio of 1:2, all can affect synergy.
Eight, the present invention also comprises prehydration slope soil paste, and the mass percentage content of prehydration slope soil paste is 4 ~ 10%, better with the use of, plugging effect with plugging agent, is particularly useful for the situation that leakoff rate is larger.
Nine, compared with Chinese patent " 200610165821.6 ": the drilling fluid of existing patent mainly for be mud shale stratum, and be form the permanent shutoff that silanol calcium etc. realizes to the shutoff mechanism that mud shale stratum realizes, can not acidifying remove; In treatment agent selected by the drilling fluid of this patent, there is amphipathic group, all there is the more effective absorption of energy on mud stone and coal petrography, and its plugging film formed can be acid-soluble, can be removed completely by acidifying in later stage completion transformation.
To sum up, adopt the present invention can form rapidly the plugged zone of a hyposmosis at coal petrography pore throat place, play and stop fluid or solid phase enters coal seam, effectively to stop, slowing down fluid leakage, prevent that easy hydrate matter in coal rock cleat and crack from expanding, dispersion and pollution reservoir.
Embodiment
Embodiment 1
Be applicable to a filming drilling fluid for coal bed gas well, comprise the component of following mass percent:
Prehydration slope soil paste 4%;
Carry stick 0.1%;
Membrane-forming agent 2.0%;
Flocculant 0.1%;
Plugging agent 0.2%;
Plugging agent 1.0%;
Alkalinity regulator 0.05%;
Surplus is water.
The preferred implementation of the present embodiment is, described stick of carrying is that Natvosol HEC and carboxyl methyl cellulose are formulated according to the mass ratio of 2:1.This is optimal way, but is not limited thereto.
In the present embodiment, described membrane-forming agent is that polyvinyl alcohol (PVA) is formulated in any proportion with at least one in sodium formiate, potassium formiate, organic silicic acid potassium or KCL.
The another preferred implementation of the present embodiment is, described flocculant is that polyacrylic acid potassium (K-PAM) and cationic polyacrylamide (CPAM) are formulated according to the mass ratio of 1:2.This is optimal way, but is not limited thereto.
The another preferred implementation of the present embodiment is, described plugging agent be in 325 object calcium carbonate, 1250 object calcium carbonate superfine powders or sulfonated gilsonite one or more according to arbitrary proportion formulated.
In the present embodiment, described plugging agent is that individual event pressure plugging agent DF-A and the thick mica of 100 objects or the thin mica of 200 objects are formulated according to arbitrary proportion according to leakage situation.
In the present embodiment, described alkalinity regulator is sodium hydroxide.This is optimal selection, also can replace with existing allied substances.
The various polymkeric substance of the present embodiment is in conjunction with best results, and the mode of " physics, chemical action combine ", can form compound closure rete in solid-liquid interface, meets the application on many cover pressure series of strata, different lithology stratum, and realizes the requirement of protection reservoir.
Embodiment 2
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
Be applicable to a filming drilling fluid for coal bed gas well, be made up of the component of following mass percent:
Prehydration slope soil paste 10.0%
Carry stick 0.3%;
Membrane-forming agent 5.0%;
Flocculant 0.3%;
Plugging agent 5.0%;
Plugging agent 10.0%
Alkalinity regulator 0.2%;
Surplus is water.
In the present embodiment, described stick of carrying is carboxyl methyl cellulose or Polyanionic Cellulose PAC-H.
In the present embodiment, described membrane-forming agent is that sodium formiate and polyvinyl alcohol are formulated by the mass ratio of 2:1.
In the present embodiment, described flocculant is that polyacrylic acid potassium (K-PAM) and cationic polyacrylamide (CPAM) are formulated according to the mass ratio of 1:1.
In the present embodiment, described plugging agent be 325 object calcium carbonate and 1250 object calcium carbonate superfine powders according to arbitrary proportion formulated.
In the present embodiment, described plugging agent is individual event pressure plugging agent DF-A.
In the present embodiment, amphipathic nature polyalcohol PVA can utilize the group active adsorption of self better on coal petrography surface and coal petrography, stops fluid further to invade.
Embodiment 3
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
Be applicable to a filming drilling fluid for coal bed gas well, be made up of the component of following mass percent:
Prehydration slope soil paste 6.0%;
Carry stick 0.2%;
Membrane-forming agent 3.0%;
Flocculant 0.2%;
Plugging agent 3.0%;
Alkalinity regulator 0.1%;
Surplus is water.
In the present embodiment, described membrane-forming agent be polyvinyl alcohol (PVA) with organic silicic acid potassium and KCL formulated in any proportion.
In the present embodiment, described flocculant is that polyacrylic acid potassium (K-PAM) and cationic polyacrylamide (CPAM) are formulated according to the mass ratio of 1:1.5.
Described plugging agent be in 325 object calcium carbonate, 1250 object calcium carbonate superfine powders or sulfonated gilsonite one or more according to arbitrary proportion formulated.
Described plugging agent is that individual event pressure plugging agent DF-A and the thick mica of 100 objects or the thin mica of 200 objects are formulated according to arbitrary proportion according to leakage situation.
In the present embodiment, carrying stick is 0.2%; Natvosol wherein and carboxymethyl cellulose can be, and it can form micella, carries out shutoff to the hole of coal petrography and mud stone, reduces the intrusion of filtrate, slows down pressure transmission and keeps wellbore stability.
Embodiment 4
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
Be applicable to a filming drilling fluid for coal bed gas well, be made up of the component of following mass percent:
Carry stick 0.1 ~ 0.3%;
Membrane-forming agent 2.0 ~ 5.0%;
Flocculant 0.1 ~ 0.3%;
Plugging agent 0.2 ~ 5.0%;
Plugging agent 1.0 ~ 10.0%;
Alkalinity regulator 0.05 ~ 0.2%;
Surplus is water.
The present embodiment, combining property the best of physics, chemical action.
Embodiment 5
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
Be applicable to a filming drilling fluid for coal bed gas well, be made up of the component of following mass percent:
Carry stick 0.3%;
Membrane-forming agent 2.0%;
Flocculant 0.3%;
Plugging agent 0.2%;
Plugging agent 10.0%;
Alkalinity regulator 0.2%;
Surplus is water.
The present embodiment, the more effective absorption of energy on mud stone and coal petrography, and its plugging film formed can be acid-soluble, can be removed completely, remove better effects if in later stage completion transformation by acidifying.
Embodiment 6
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
Be applicable to a filming drilling fluid for coal bed gas well, comprise the component of following mass percent:
Carry stick 0.1%;
Membrane-forming agent 5.0%;
Flocculant 0.1%;
Plugging agent 5.0%;
Plugging agent 1.0%;
Alkalinity regulator 0.05%;
Surplus is water.
The present embodiment, can form rapidly the plugged zone of hyposmosis, and the plugged zone speed forming hyposmosis is faster, can concur with the coal petrography of oleophylic and hydrophilic clay mineral.
Embodiment 7
Be applicable to a preparation method for the filming drilling fluid of coal bed gas well, comprise the steps:
A, by mass percentage proportioning: carry stick 0.1 ~ 0.3%; Membrane-forming agent 2.0 ~ 5.0%; Flocculant 0.1 ~ 0.3%; Plugging agent 0.2 ~ 5.0%; Plugging agent 1.0 ~ 10.0%; Alkalinity regulator 0.05 ~ 0.2%; Surplus is water;
B, carry stick, plugging agent, membrane-forming agent and the flocculant of said ratio are added in clear water, be fully uniformly mixed;
C, add the plugging agent of said ratio again, stir and make it fully be uniformly dispersed;
D, pH value is adjusted to not higher than 10, for pH during Reservoir Section not higher than 9 with the alkalinity regulator of said ratio again.
The present invention also comprises the step adding prehydration slope soil paste, and after the plugging agent added is uniformly dispersed, then to add mass percentage content be 4 ~ 10% prehydration slope soil pastes, and mix, then adjust ph is adjusted.
Embodiment 8
The preparation method being applicable to the filming drilling fluid of coal bed gas well is as follows:
Carried out according to following program at normal temperatures and pressures by the component of aforementioned proportion:
1) need in slurry commanding tank, load certain volume clear water or mud according to scene;
2) said ratio is carried stick, plugging agent, membrane-forming agent and flocculant adds in clear water under concrete pump effect, is fully uniformly mixed;
3) add appropriate plugging agent (1 ~ 10%) when running into obviously leakage according to scene is actual again, stir and make it fully be uniformly dispersed;
According to leakage situation, also can add mass percentage content is 4 ~ 10% prehydration slope soil pastes;
After adding plugging agent, plugging agent is by the bridging action energy leakage hole that shutoff is large rapidly, and final fracture forms shutoff.
4) be adjusted to not higher than 10 with the alkalinity regulator of said ratio by pH value again, the pH of Reservoir Section is not higher than 9;
5) in actual use, membrane-forming agent suitably can regulate according to leakage situation with the dosage carrying stick, if run into the obvious stratum of seepage, can improve.
Embodiment 9
Application example: MSB24-6, MS24-7 well and MSB26-11 well
This wellblock well depth at 1186.7-1196.8m, Taiyuan Forma-tion 9# thickness of coal seam 5m ~ 14.2m, lithology is purer, and perviousness is better, and ash oontent is 3.7%; The porosity in this section of coal seam is about 10.9%.Upper and lower roof and floor closure is strong, and being beneficial to Coalbed Methane, is main force's coalbed methane reservoir of this wellblock.
Because force tries 15 wells, to go out a disintegration of core serious, is hampered serious when making a trip, and time has and meets card and occur, the later stage go into operation after production capacity less than 500 sides/sky.Therefore, in order to ensure the downhole safety of these 3 mouthfuls of test pits and improve the ability of drilling fluid protecting reservoir, have employed the drilling fluid system with strong shutoff film forming ability of independent research.The result of use of OPTIMIZATION OF DRILLING FLUID, has carried out a large amount of investigations and analysis, better to adjust drilling liquid parameter for Different Strata to the log data of construction in early stage well and site operation data before construction.In conjunction with coal rock experimental data and indoor drilling fluid composition experimental data in early stage, the Drilling optimization parameter when constructing: creep into the pressure of the drill 50-80KN, revolution 32rpm/min, discharge capacity 32L/S, pump pressure 10-12MPa, returns out drilling cuttings even, without falling block; Daily footage 200 meters/day.
OPTIMIZATION OF DRILLING FLUID parameter and performance maintenance: because higher drilling well liquid columnpressure can cause the injury to coal seam, this drilling fluid has stable and protection borehole wall effect preferably; Two drive to group stratum, Shanxi based on safety and improve drilling speed, be mainly low solids fluid.
the salient features mean parameter of drilling fluid tested by table 1
Before opening coal seam 50 ~ 100 meters, drilling fluid density controls at 1.08g/cm
3below, dehydration controls at below 5ml, and viscosity controller is at below 45s, and the solid load in strict control mud is below 4%, reduces coal seam pollution damage.
The experiment effect of drilling fluid shows: (1) filming drilling fluid is in the test of Shanxi coal bed gas well, and down-hole is normal, makes a trip without being hampered; (2) filming drilling fluid good prevents Coal Seam Collapse and reservoir protection effect to having; (3) drilling speed compares speed-raising more than 5% ~ 10% with polymer drilling fluid speed; (4) use during filming drilling fluid and wireless instruments signal is not affected.
table 2 experiment well hole enlargement ratio data
| Pound sign | The average amplification degree % of coal seam section hole diameter | Full well section diameter enlargement ratio % |
| MBS26-11 | 13.8 | 5.87 |
| MBS24-6 | 14.1 | 3.75 |
| MBS26-7 | 17.7 | 6.76 |
table 3 go into operation after data statistic
| Pound sign | Operation amount side/sky |
| MSB26-11 well | 1096 |
| MSB24-6 well | 1160 |
| MSB24-7 well | 1250 |
Application prospect: the present invention can be widely used in Shanxi, Shaanxi coal bed gas well and have large space and the high leakiness stratomere of rate of permeation, is also applicable to the sandstone formation operation that Reservoir Section rate of permeation is higher.
Reservoir protection excellent effect of the present invention, leak resistance is good, good in economic efficiency, and can obtain good social benefit and environmental benefit.For exploitation and the wide prospect of the application of current coal bed gas well, particularly excellent film forming sealing characteristics, utilizes the present invention to have broad application prospects to the leakproof on leakiness stratum and the reservoir protection of Reservoir Section.
Claims (10)
1. be applicable to a filming drilling fluid for coal bed gas well, it is characterized in that, comprise the component of following mass percent:
Carry stick 0.1 ~ 0.3%;
Membrane-forming agent 2.0 ~ 5.0%;
Flocculant 0.1 ~ 0.3%;
Plugging agent 0.2 ~ 5.0%;
Plugging agent 1.0 ~ 10.0%;
Alkalinity regulator 0.05 ~ 0.2%;
Surplus is water.
2. the filming drilling fluid being applicable to coal bed gas well according to claim 1, is characterized in that: also comprise prehydration slope soil paste, and the mass percentage content of prehydration slope soil paste is 4 ~ 10%.
3. the filming drilling fluid being applicable to coal bed gas well according to claim 1 and 2, is characterized in that: described stick of carrying is that Natvosol HEC and carboxyl methyl cellulose are formulated according to the mass ratio of 2:1.
4. the filming drilling fluid being applicable to coal bed gas well according to claim 1 and 2, is characterized in that: described stick of carrying is carboxyl methyl cellulose or Polyanionic Cellulose PAC-H.
5. the filming drilling fluid being applicable to coal bed gas well according to claim 3, is characterized in that: described membrane-forming agent is that polyvinyl alcohol (PVA) is formulated in any proportion with at least one in sodium formiate, potassium formiate, organic silicic acid potassium or KCL.
6. the filming drilling fluid being applicable to coal bed gas well according to claim 1,2 or 5, is characterized in that: described flocculant is that polyacrylic acid potassium (K-PAM) and cationic polyacrylamide (CPAM) are formulated according to the mass ratio of 1:1-2.
7. the filming drilling fluid being applicable to coal bed gas well according to claim 6, is characterized in that: described plugging agent be in 325 object calcium carbonate, 1250 object calcium carbonate superfine powders or sulfonated gilsonite one or more according to arbitrary proportion formulated.
8. the filming drilling fluid being applicable to coal bed gas well according to claim 1,2,5 or 7, is characterized in that: described plugging agent is that individual event pressure plugging agent DF-A and the thick mica of 100 objects or the thin mica of 200 objects are formulated according to arbitrary proportion according to leakage situation.
9. the filming drilling fluid being applicable to coal bed gas well according to claim 8, is characterized in that: described alkalinity regulator is sodium hydroxide.
10. be applicable to a preparation method for the filming drilling fluid of coal bed gas well, it is characterized in that, comprise the steps:
A, by mass percentage proportioning: carry stick 0.1 ~ 0.3%; Membrane-forming agent 2.0 ~ 5.0%; Flocculant 0.1 ~ 0.3%; Plugging agent 0.2 ~ 5.0%; Plugging agent 1.0 ~ 10.0%; Alkalinity regulator 0.05 ~ 0.2%; Surplus is water;
B, carry stick, plugging agent, membrane-forming agent and the flocculant of said ratio are added in clear water, be fully uniformly mixed;
C, add the plugging agent of said ratio again, stir and make it fully be uniformly dispersed;
D, pH value is adjusted to not higher than 10, for pH during Reservoir Section not higher than 9 with the alkalinity regulator of said ratio again.
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| CN201310485959.4A CN103525383B (en) | 2013-10-17 | 2013-10-17 | Filming drilling fluid being applicable to coal bed gas well and preparation method thereof |
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| CN201310485959.4A CN103525383B (en) | 2013-10-17 | 2013-10-17 | Filming drilling fluid being applicable to coal bed gas well and preparation method thereof |
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| CN103525383A CN103525383A (en) | 2014-01-22 |
| CN103525383B true CN103525383B (en) | 2016-01-13 |
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| CN105295866A (en) * | 2015-11-05 | 2016-02-03 | 中石化石油工程技术服务有限公司 | Composite inorganic salt drilling fluid |
| CN105441050B (en) * | 2015-11-11 | 2017-03-08 | 松原市海洋石油技术有限公司 | A kind of function desmosome diverting agent and preparation method thereof |
| CN106467726B (en) * | 2016-09-14 | 2019-10-29 | 中国石油集团渤海钻探工程有限公司 | One kind is for coal bed gas cleaning poly film drilling fluid and preparation method thereof |
| CN106495640A (en) * | 2016-10-29 | 2017-03-15 | 张静 | A kind of preparation method of anti-leakage blocking agent |
| CN106566484B (en) * | 2016-10-31 | 2018-08-28 | 中国石油大学(华东) | Fracture-type reservoir protective agent composition, the drilling fluid containing the fracture-type reservoir protective agent composition and its application |
| CN108276978A (en) * | 2018-04-02 | 2018-07-13 | 中国矿业大学(北京) | A kind of underground coal mine is with boring anti-collapse type flushing liquor and preparation method thereof |
| CN109054778B (en) * | 2018-09-05 | 2021-03-16 | 中石化石油工程技术服务有限公司 | Water-based film forming agent, preparation method thereof, water-based drilling fluid and application thereof |
| CN110157397A (en) * | 2019-05-23 | 2019-08-23 | 新疆格瑞迪斯石油技术股份有限公司 | A kind of drilling fluid nanometer film forming sealing agent and its preparation method and application |
| CN110229652B (en) * | 2019-06-28 | 2021-08-10 | 中国石油天然气集团有限公司 | Drilling fluid cleaning slurry for shaft purification and preparation and use methods thereof |
| CN112239654A (en) * | 2019-07-18 | 2021-01-19 | 中石化石油工程技术服务有限公司 | Well wall reinforcing material for drilling fluid and preparation method thereof |
| CN112239660A (en) * | 2019-07-18 | 2021-01-19 | 中石化石油工程技术服务有限公司 | Bionic wall-fixing agent for drilling fluid and preparation method thereof |
| CN113773820B (en) * | 2020-06-09 | 2024-03-08 | 中国石油化工股份有限公司 | Pressure-bearing leakage-blocking slurry and preparation method and application thereof |
| CN114152555B (en) * | 2022-02-09 | 2022-04-15 | 成都理工大学 | Drilling fluid leakage damage simulation device and method |
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