CN105349120A - Micro solid-phase drilling fluid used for coal-seam-following coal seam gas well and capable of timed degradation and timed degradation method thereof - Google Patents

Micro solid-phase drilling fluid used for coal-seam-following coal seam gas well and capable of timed degradation and timed degradation method thereof Download PDF

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Publication number
CN105349120A
CN105349120A CN201510819392.9A CN201510819392A CN105349120A CN 105349120 A CN105349120 A CN 105349120A CN 201510819392 A CN201510819392 A CN 201510819392A CN 105349120 A CN105349120 A CN 105349120A
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China
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drilling fluid
coal
micro
parts
gas well
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Inventor
吕帅锋
王生维
乌效鸣
王道宽
张峰
粟冬梅
黄河
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China University of Geosciences
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China University of Geosciences
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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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention belongs to the technical field of coal seam gas well drilling fluid, and particularly relates to a micro solid-phase drilling fluid used for a coal-seam-following coal seam gas well and capable of timed degradation and a timed degradation method thereof. The micro solid-phase drilling fluid is composed of functional components and a degradation agent, wherein the functional components include the following components in parts by weight: 1000 parts of clear water, 20-30 parts of a skeleton film-forming agent, 0.5-1 part of an adhesive improver, 20-30 parts of a fluid loss reducer, 0.5-1 part of a flow pattern regulator, 20-30 parts of an inhibitor and 0.8-1.2 parts of a dispersant; and the degradation agent comprises 0.05-0.1 part by weight of a degradation agent. The micro solid-phase drilling fluid provided by the invention can alleviate the contradiction between safety drilling and reservoir stratum protection facing in a current coal-seam-following well-drilling process, so that the coal-seam gas recovery rate and yield are facilitated to be improved, later waste pulp processing is also more convenient, costs are saved, and green environmental protection is achieved.

Description

The micro-solid phase drilling fluid can regularly degraded for the coal bed gas well in suitable coal seam and timing degradation method
Technical field
The invention belongs to coal bed gas well drilling liquid technology field, be specifically related to a kind of micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam and timing degradation method.
Background technology
In CBM exploration and development, the means of drilling well necessity.Coal seam has the features such as low porosity, low permeability and low reservoir pressure, and along this well type of coal seam well because can expand the contact area in well and coal seam, greatly improves coal-seam gas recovery ratio and be therefore generally used.
Meets area greatly along drilling in coal and coal seam drilling, and cracks in coal seam phylogeny, physical strength is weak, stress sensitivity is strong, thus in drilling process, easily runs into that outstanding slag chip removal is difficult, borehole collapse falls the difficult points such as block, leakage, reservoir easily pollute.Therefore need to propose following requirement to along drilling fluid in coal seam drilling process:
(1) suspension ickings effect, ensures that in boring, ickings is excluded totally, reaches and fast and safely creeps into requirement;
(2) protect borehole wall effect, carry out equilibrium strata pressure by low density, preventing the further invaded coal layer of drilling fluid by forming mud cake, meeting the requirement that different coal is crept into;
(3) fall by force dehydration effect, namely reduce the effect that CBM Drilling liquid permeates to stratum;
(4) restraining effect, suppresses the hydration swelling on stratum by inhibitor, the effects such as undergauge of caving in, and then protects the coal seam borehole wall;
(5) protect reservoir effect, reduce drilling fluid to the harm of coal seam reservoirs, improve methane output.
(6) there is instant feature.In order to shorten drilling period, needing to shorten in the drilling fluid preparation time, making within a short period of time the abundant prehydration of drilling fluid reach the viscosity of expection.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides a kind of micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam and timing degradation method.Micro-solid phase drilling fluid provided by the present invention can be alleviated at present along the contradiction between the safety drilling faced in coal seam drilling process and reservoir protection: micro-solid phase can ensure fast drilling, reduces solid load in the drilling fluid entered in coal seam simultaneously; Add biological enzyme to drilling fluid timing degraded, high polymer to be removed and pollute coal seam, ensure that coal-seam gas migration pathway is not blocked, thus contribute to improving coal-seam gas recovery ratio and output, and for the later stage give up slurry process also more convenient, cost-saving, environmental protection.
A kind of micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam, be made up of function ingredients and degradation agents, wherein, described function ingredients comprises each component of following portions by weight: 1000 parts, clear water, skeleton membrane-forming agent 20 ~ 30 parts, carry stick 0.5 ~ 1 part, water retaining 20 ~ 30 parts, flow pattern regulator 0.5 ~ 1 part, 20 ~ 30 parts, inhibitor and dispersion agent 0.8 ~ 1.2 part, and described degradation agents is the degradation agents of 0.05 ~ 0.1 weight part.
In technique scheme, function ingredients is separated in the early stage with degradation agents.In mid-term, realize drilling well with function ingredients.In the later stage, degradation agents is mixed in the function ingredients after drilling well, the degraded of drilling fluid can have been carried out.
Concrete, described skeleton membrane-forming agent is that granularity is less than 200 object sodium bentonites.
Concrete, described in carry stick be high adhesive aggregation anionic cellulose, the sodium salt of high adhesive aggregation anionic cellulose or the sylvite of high adhesive aggregation anionic cellulose, wherein, the number-average molecular weight of high adhesive aggregation anionic cellulose is greater than 1,200 ten thousand.High adhesive aggregation anionic cellulose can be obtained by the mode bought, the such as well drilling mud accessory agents material product of Zhengzhou great achievement drilling mud company limited, the petroleum chemicals of Jingzhou Jiahua Technology Co., Ltd..The sylvite of high adhesive aggregation anionic cellulose or sodium salt can by obtaining the sylvite of high adhesive aggregation anionic cellulose or sodium salt.
Concrete, water retaining is made up of high temperature resistance treated starch and low adhesive aggregation anionic cellulose, wherein, the number-average molecular weight of described high temperature resistance treated starch is 180 ~ 2,200,000, the number-average molecular weight of described low adhesive aggregation anionic cellulose is 180 ~ 2,200,000, and the weight ratio of described high temperature resistance treated starch and described adhesive aggregation anionic cellulose is 1 ~ 2:1.High temperature resistance treated starch can be obtained by the mode bought, the such as well drilling mud accessory agents material product of Zhengzhou great achievement drilling mud company limited, heatproof temperature reaches 130 degrees Celsius.Low adhesive aggregation anionic cellulose can be obtained by the mode bought, the such as well drilling mud accessory agents material product of Zhengzhou great achievement drilling mud company limited, the slurried material product of Yanggu distance of travel of roc Chemical Co., Ltd..
Concrete, described flow pattern regulator is sesbania gum.
Concrete, described inhibitor be a kind of in Repone K or ammonium chloride or both be the mixing of 1 ~ 2:0 ~ 1 in mass ratio.Preferably, be Repone K.
Concrete, described dispersion agent is soluble carbonate salt and/or solubility supercarbonate, as sylvite or sodium salt.Preferably, be sodium carbonate.
Concrete, described degradation agents is any one or multiple mixing in cellulase, neutral protease or amylase.
The performance index of micro-solid phase drilling fluid provided by the present invention: base slurry (not adding biological enzyme) density is no more than 1.02g/cm 3, apparent viscosity 35 ~ 60mPas, shear force is up to 25Pa, and lubricating coefficient is less than 0.2, and API filtration 7 ~ 10ml, pH are 8 ~ 9.By adding adjustment to three kinds of different biological enzymes, can adjust degradation time.
Function: this drilling fluid is low thus reduce drilling fluid density by solid load, reduces and pressure reduction between formation fluid pressure, and then reduces the pollution to coal seam while equilibrium strata pressure; There is good rheological, can Effective Suspension ickings, get rid of boring mud; Play protection borehole wall effect, efficiently carry stick and skeleton membrane-forming agent effectively can improve viscosity, form the thin and mud cake of densification, the cementation to the soft borehole wall can be strengthened; Have and fall by force dehydration effect, strong water retaining can reduce in earlier stage instantaneous fluid loss greatly, and film forming skeleton can reduce later stage fluid loss, integrates the effect that greatly can reduce CBM Drilling liquid and permeate to stratum; Inhibitor have suppress the hydration swelling of clay in coal seam, eyelet caves in the effects such as undergauge, and then the protection coal seam borehole wall; Biological enzyme can play the timing Degradation to drilling fluid, reduces CBM Drilling liquid to the harm in coal seam, thus improves coal-seam gas recovery ratio and output
Present invention also offers a kind of timing degradation method: the micro-solid phase drilling fluid not adding biological enzyme can be used for fast and safely creeping into along coal seam section, several hours before finishing drilling, in drilling fluid, appropriate amount biological enzyme is added according to practical situation, drilling fluid is fully circulated, high polymer etc. gradually before degraded on the borehole wall and in coal seam in drilling fluid, reaches the effect of film forming retaining wall in early stage, later stage de-plugging raising gas production rate.
Innovative point: (1) traditional coal seam gas well drilling liquid is for forming the mud cake protection borehole wall, and general solid load reaches more than 5%, and density is generally at 1.05g/cm 3above, this drilling fluid has micro-solid phase, low density feature, and sodium soil content is 2% ~ 3%, and density is only 1.02g/cm 3, the thin and mud skin of densification, the available protecting borehole wall can be formed.
(2) macromolecular material such as carboxymethyl cellulose (CMC) and xanthan gum (XC) is added in traditional coal seam gas drilling fluid as carrying stick, carboxymethyl cellulose is insoluble in water, and preparation drilling fluid needs slowly to feed in raw material to need prehydration 24 hours simultaneously; Although xanthan gum is carried sticky effective, self performance is extremely stable, is not easy to degrade, and easily blocks cracks in coal seam, reduces methane output, and later stage useless slurry intractability increase, easily causes environmental pollution simultaneously.This drilling fluid materials is all soluble in water, has instant feature, stirs placement and can use for 5 ~ 8 hours, substantially reduce drilling fluid preparing time; Use sesbania gum, both can as flow pattern regulator, as tackifier, easily can degrade again, solving protection coal reservoir and later stage gives up the difficult problem of slurry process, cost-saving, environmental protection simultaneously.
(3) timing Degradation.After adding different biological enzymes, drilling fluid plays degradation effect in the set time, and viscosity reduces, and efficient solution, except drilling fluid residual contaminants in coal seam, reaches de-plugging object, thus improves coal-seam gas recovery ratio and output.
Accompanying drawing explanation
Fig. 1 is effect illustration of the present invention.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, illustrated embodiment, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
Formula: this drilling fluid is made up of the raw material of following portions by weight: 1000 parts, clear water, and stick 0.5 part efficiently carried by skeleton membrane-forming agent 30 parts, strong water retaining 20 parts, flow pattern regulator 0.5 part, 30 parts, inhibitor, dispersion agent 0.8 part, degradation agents 0.1 part.Wherein, skeleton membrane-forming agent is high-quality sodium bentonite, and granularity is less than 200 orders; Efficiently carrying stick is high adhesive aggregation anionic cellulose (code name HV-PAC), and molecular weight is greater than 1,200 ten thousand; Strong water retaining is made up of treated starch (code name DFD) and low adhesive aggregation anionic cellulose (code name LV-PAC), and molecular weight is all about 2,000,000; Flow pattern regulator is sesbania gum (code name TJJ), and molecular weight is greater than 1,200 ten thousand; Inhibitor is Repone K; Dispersion agent is soda ash; Degradation agents is biological enzyme, is specially cellulase.
Performance index: base slurry (not adding biological enzyme) density is 1.02g/cm 3, apparent viscosity 45mPas, shear force is up to 25Pa, and lubricating coefficient is less than 0.2, and API filtration 8ml, pH are 8.To add after degradation agents 4 hours degradables, 50%, 4 days degradables to initial viscosity to 90% of initial viscosity.
Embodiment 2
Formula: this drilling fluid is made up of the raw material of following portions by weight: 1000 parts, clear water, and stick 1 part efficiently carried by skeleton membrane-forming agent 25 parts, strong water retaining 10 parts, flow pattern regulator 1 part, 20 parts, inhibitor, dispersion agent 1.2 parts, degradation agents 0.05 part.Wherein, skeleton membrane-forming agent is high-quality sodium bentonite, and granularity is less than 200 orders; Efficiently carrying stick is high adhesive aggregation anionic cellulose, and molecular weight is greater than 1,200 ten thousand; Strong water retaining is made up of treated starch and low adhesive aggregation anionic cellulose, and molecular weight is all about 2,000,000; Flow pattern regulator is sesbania gum, and molecular weight is greater than 1,200 ten thousand; Inhibitor is Repone K; Dispersion agent is soda ash; Degradation agents is biological enzyme, is specially cellulase and amylase.
Performance index: base slurry (not adding biological enzyme) density is less than 1.02g/cm 3, apparent viscosity 50mPas, shear force is up to 25Pa, and lubricating coefficient is less than 0.2, and API filtration 10ml, pH are 9.To add after degradation agents 4 hours degradables, 80%, 4 days degradables to initial viscosity to 20% of initial viscosity.
Embodiment 3.
Formula: this drilling fluid is made up of the raw material of following portions by weight: 1000 parts, clear water, and stick 0.75 part efficiently carried by skeleton membrane-forming agent 20 parts, strong water retaining 15 parts, flow pattern regulator 0.75 part, 25 parts, inhibitor, dispersion agent 1.0 parts, degradation agents 0.08 part.Wherein, skeleton membrane-forming agent is high-quality sodium bentonite, and granularity is less than 200 orders; Efficiently carrying stick is high adhesive aggregation anionic cellulose, and molecular weight is greater than 1,200 ten thousand; (form, molecular weight is all about 2,000,000 by treated starch and low adhesive aggregation anionic cellulose for strong water retaining; Flow pattern regulator is sesbania gum, and molecular weight is greater than 1,200 ten thousand; Inhibitor is Repone K; Dispersion agent is soda ash; Degradation agents is biological enzyme, is specially cellulase, amylase and neutral protease.
Performance index: base slurry (not adding biological enzyme) density is less than 1.015g/cm 3, apparent viscosity 40mPas, shear force is up to 25Pa, and lubricating coefficient is less than 0.2, and API filtration 9ml, pH are 8.To add after degradation agents 4 hours degradables, 40%, 4 days degradables to initial viscosity to 90% of initial viscosity.
Effect example
According to formulated drilling fluid below
As shown in Figure 1, by adding adjustment to three kinds of different biological enzymes, can adjust degradation time: add 50%, the 4 day degradables of cellulase 4 hours degradables to initial viscosity to 90% of initial viscosity; Add neutral protease after 24 hours degradable to 50% of initial viscosity, 4 day degradable to 90% of initial viscosity.Add 50%, the 4 days degradables to initial viscosity of degradable behind amylase 2 sky to 75% of initial viscosity.
And then, by adding after three kinds of composite mixing of biological enzyme, comparatively accurate timing degraded can be carried out.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam, it is characterized in that, be made up of function ingredients and degradation agents, wherein, described function ingredients comprises each component of following portions by weight: 1000 parts, clear water, skeleton membrane-forming agent 20 ~ 30 parts, carry stick 0.5 ~ 1 part, water retaining 20 ~ 30 parts, flow pattern regulator 0.5 ~ 1 part, 20 ~ 30 parts, inhibitor and dispersion agent 0.8 ~ 1.2 part, and described degradation agents is the degradation agents of 0.05 ~ 0.1 weight part.
2. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 1, is characterized in that: described skeleton membrane-forming agent is that granularity is less than 200 object sodium bentonites.
3. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 2, it is characterized in that: described in carry stick be high adhesive aggregation anionic cellulose, the sodium salt of high adhesive aggregation anionic cellulose or the sylvite of high adhesive aggregation anionic cellulose, wherein, the number-average molecular weight of high adhesive aggregation anionic cellulose is greater than 1,200 ten thousand.
4. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 3, it is characterized in that: described water retaining is made up of high temperature resistance treated starch and low adhesive aggregation anionic cellulose, wherein, the number-average molecular weight of described high temperature resistance treated starch is 180 ~ 2,200,000, the number-average molecular weight of described low adhesive aggregation anionic cellulose is 180 ~ 2,200,000, and the weight ratio of described high temperature resistance treated starch and described adhesive aggregation anionic cellulose is 1 ~ 2:1.
5. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 4, is characterized in that: described flow pattern regulator is sesbania gum.
6. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 5, is characterized in that: described inhibitor be a kind of in Repone K or ammonium chloride or both be the mixing of 1 ~ 2:0 ~ 1 in mass ratio.
7. the micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam according to claim 6, is characterized in that: described dispersion agent is soluble carbonate salt and/or solubility supercarbonate.
8. according to the arbitrary described micro-solid phase drilling fluid for can regularly degrade along the coal bed gas well in coal seam of claim 1 to 7, it is characterized in that: described degradation agents is any one or multiple mixing in cellulase, neutral protease or amylase.
9. a timing degradation method, it is characterized in that: be used for fast and safely creeping into along coal seam section by the function ingredients of arbitrary for claim 1 to 8 described micro-solid phase drilling fluid, the degradation agents adding the arbitrary described micro-solid phase drilling fluid of claim 1 to 8 for 2 ~ 4 hours before finishing drilling is degraded.
CN201510819392.9A 2015-11-23 2015-11-23 Micro solid-phase drilling fluid used for coal-seam-following coal seam gas well and capable of timed degradation and timed degradation method thereof Pending CN105349120A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109337658A (en) * 2018-12-03 2019-02-15 重庆力宏精细化工有限公司 A kind of water-based drilling solution additive and its drilling fluid and preparation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109337658A (en) * 2018-12-03 2019-02-15 重庆力宏精细化工有限公司 A kind of water-based drilling solution additive and its drilling fluid and preparation method

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