CN104046337A - Clean drilling fluid used for coal bed gas multi-branch horizontal well storage layer and preparation method of clean drilling fluid - Google Patents
Clean drilling fluid used for coal bed gas multi-branch horizontal well storage layer and preparation method of clean drilling fluid Download PDFInfo
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- CN104046337A CN104046337A CN201410273886.7A CN201410273886A CN104046337A CN 104046337 A CN104046337 A CN 104046337A CN 201410273886 A CN201410273886 A CN 201410273886A CN 104046337 A CN104046337 A CN 104046337A
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- 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
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Abstract
The invention discloses clean drilling fluid used for a coal bed gas multi-branch horizontal well storage layer and a preparation method of the clean drilling fluid. The drilling fluid consists of the following materials in parts by weight: 100 parts of clear water, 0.5-1 part of a gelatinizing agent, 0.5-1 part of gelatinizing aid, and 0.1-0.2 part of a high temperature stabilizer, wherein the gelatinizing agent is composed of hexadecyl trimethyl ammonium bromide and cetyl pyridinium chloride monohydrate in a weight ratio of 4:1; the gelatinizing aid is composed of sodium salicylate and potassium chloride in a weight ratio of 1:1; the high temperature stabilizer is sodium thiosulfate. The drilling liquid does not use bentonite or polymer to improve viscosity, but uses micromolecule surfactant to form a micelle for increasing viscosity, is good in rock carrying capacity, quick and complete to break glue, and capable of guaranteeing a well hole to be clean while protecting the coal bed gas storage layer to the greatest extent, and reducing scouring of drilling fluid on well wall, so that drill blocking risks are lowered, and therefore, contradiction between the drilling safety and the storage layer protection in a drilling process of the existing coal bed gas multi-branch horizontal well is relieved to a certain extent.
Description
Technical field
The present invention relates to a kind of drilling fluid, in particular for clean drilling fluid of coal bed gas multi-branch horizontal reservoir and preparation method thereof.
Background technology
Coal-seam gas comes into one's own day by day as a kind of non-conventional gas resource, and China's coal-seam gas reserves are quite abundant, and further investigation CBM exploration and development technology is imperative.
20 century 70s, just started the research work of cbm development aspect abroad, theory and the production practice of a set of maturation have been formed, but the work of the CBM exploration and development poweies such as the U.S. is many aspect low order coal-seam gas, the main multi-branched horizontal well that adopts open hole completion, is generally used clear water as drilling fluid.
China carries out the research of coal-seam gas aspect since the nineties in 20th century, to 2005, cbm development entered boost phase later, initial period CBM Drilling liquid is to take conventional gas and oil well drilling fluid as basis always, the improvement of being correlated with according to some presentation characteristics of coal seam, and be mostly the improvement for the straight well drilling fluid of cased hole completion.In recent years, China's coal-seam gas test pit adopts the multi-branched horizontal well of open hole completion more, adopts conventional gas and oil well drilling fluid to coalbed methane reservoir infringement greatly, often bores completion gas production rate almost nil; Because China's cbm development mainly concentrates on high-order coal aspect, the low-rank coal of comparing, its intensity difference, easily cave in, adopt clear water as drilling fluid, take lithology poor, the borehole wall is washed away seriously, borehole well instability very easily occurs in drilling process, and landwaste can not be carried outside in time, thereby frequently lock of tool drilling occurs.Therefore, the contradiction between wellbore stability and reservoir protection becomes a great problem of restriction China coal bed gas multi-branch horizontal development technique.
Along with cbm development progresses into high-tide period, seek the special-purpose drilling fluid of a kind of coal bed gas multi-branch horizontal reservoir that can take into account wellbore stability and reservoir protection very urgent, certainly will become the focus of coal-seam gas security development technical study.
Summary of the invention
The present invention is directed to the hole collapse that faces in current coal bed gas multi-branch horizontal drilling process and the contradiction between reservoir protection; a kind of clean drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof is provided; it is fast and thorough that this drilling fluid has good, the broken glue of the lithology of taking; can when protecting reservoir to greatest extent, reduce as much as possible drilling fluid washing away the borehole wall; assurance well is clean; thereby the risk that reduces bit freezing is achieved drilling safety and reservoir protection simultaneously.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of clean drilling fluid for coal bed gas multi-branch horizontal reservoir, by weight, is comprised of following component:
Wherein, gelatinizing agent consists of by weight 4:1 cetyl trimethylammonium bromide and hexadecylpyridinium chloride; Help jelly to be formed by weight 1:1 by sodium salicylate and Repone K.
Described high-temperature stabiliser is Sulfothiorine.
The preparation method of the above-mentioned clean drilling fluid for coal bed gas multi-branch horizontal reservoir, is characterized in that, by weight, comprises the following steps:
(1) get 100 parts, clear water, pour in high speed agitator slurry cup, regulate stirring velocity to (3-5) * 10
3r/min, adds 0.5～1 part of gelatinizing agent while stirring;
(2) to adding in (1) gained solution, help 0.5～1 part of jelly while stirring;
(3) in (2) described solution, add 0.1～0.2 part of high-temperature stabiliser while stirring, after feeding in raw material, regulate stirring velocity to (10-12) * 10
3r/min, continues to stir 10-30min, can use.
Positively effect of the present invention is:
(1) without solid phase, material therefor is soluble small molecular compound, can not stop up coalbed methane reservoir hugger;
(2) ratio of dynamic shear force/yield value to plastic viscosity is high, takes lithology good, little to borehole wall souring;
(3) the fast and noresidue of broken glue, little to coalbed methane reservoir injury.
Embodiment
Clean drilling fluid for coal bed gas multi-branch horizontal reservoir of the present invention, by weight, is comprised of following component:
Wherein, gelatinizing agent consists of by weight 4:1 cetyl trimethylammonium bromide and hexadecylpyridinium chloride; Help jelly to be formed by weight 1:1 by sodium salicylate and Repone K.
Described high-temperature stabiliser is Sulfothiorine.
The preparation method of the above-mentioned clean drilling fluid for coal bed gas multi-branch horizontal reservoir, is characterized in that, by weight, comprises the following steps:
(1) get 100 parts, clear water, pour in high speed agitator slurry cup, regulate stirring velocity to (3-5) * 10
3r/min, adds 0.5～1 part of gelatinizing agent while stirring;
(2) to adding in (1) gained solution, help 0.5～1 part of jelly while stirring;
(3) in (2) described solution, add 0.1～0.2 part of high-temperature stabiliser while stirring, after feeding in raw material, regulate stirring velocity to (10-12) * 10
3r/min, continues to stir 10-30min, can use.
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment 1
(1) get clear water 400mL, pour in high speed agitator slurry cup, regulate stirring velocity to 4*10
3r/min, adds 2g gelatinizing agent (mixed and formed by 1.6g cetyl trimethylammonium bromide and 0.4g hexadecylpyridinium chloride) while stirring;
(2) in (1) gained solution, add 2g to help jelly (mix and form by 1g sodium salicylate and 1g Repone K) while stirring;
(3) in (2) described solution, add 0.4g high-temperature stabiliser (Sulfothiorine) while stirring, after feeding in raw material, regulate stirring velocity to 11*10
3r/min, continues to stir 20min, obtains the clean drilling fluid of coal bed gas multi-branch horizontal reservoir of the present invention special use.
Measured respectively the clean drilling fluid for coal bed gas multi-branch horizontal that makes the as stated above rheological parameter after normal temperature and high temperature ageing below.
High temperature ageing method: the drilling fluid making is as stated above packed in airtight high-temperature tank, then high-temperature tank is put into temperature and is the drilling fluid special-purpose high temperature roller furnace of 120 ℃, open high temp roller furnace rolling switch, after high temperature rolling 16h, take out, from high-temperature tank, pour out after cooling, measure its performance.
Table 1 experimental data shows: gained drilling fluid ratio of dynamic shear force/yield value to plastic viscosity of the present invention is high, can meet horizontal well and take rock demand, and temperature resistance is good.
Table 1 gained drilling fluid rheology of the present invention and temperature resistance evaluation result
Evaluated the broken glue effect of the clean drilling fluid of the coal bed gas multi-branch horizontal reservoir special use making as stated above below.
Gel breaking method: the drilling fluid making is as stated above poured in high speed agitator slurry cup, regulated stirring velocity to 4*10
3r/min adds 0.8g gel breaker (ammonium persulphate) while stirring in slurry cup.
Broken glue effect evaluation method: before measuring respectively broken glue and add the apparent viscosity of 5min, 10min after gel breaker, 20min gained drilling fluid of the present invention, reach time below 2mPa.s for breaking the glue time completely with apparent viscosity.
Table 2 experimental data shows: gained drilling fluid of the present invention adds only 10min of gel breaker, and its apparent viscosity is just reduced to 2mPa.s, its broken glue is described soon and noresidue.
Table 2 gained drilling fluid of the present invention breaks glue effect assessment result
In sum, content of the present invention is not limited in the above-described embodiment, and the knowledgeable people in same area can propose easily other embodiment within technical director's thought of the present invention, but this embodiment comprises within the scope of the present invention.
Claims (3)
1. for a clean drilling fluid for coal bed gas multi-branch horizontal reservoir, it is characterized in that, by weight, by following component, formed:
Wherein, gelatinizing agent consists of by weight 4:1 cetyl trimethylammonium bromide and hexadecylpyridinium chloride; Help jelly to be formed by weight 1:1 by sodium salicylate and Repone K.
2. the clean drilling fluid for coal bed gas multi-branch horizontal reservoir according to claim 1, is characterized in that, described high-temperature stabiliser is Sulfothiorine.
3. the preparation method of the clean drilling fluid for coal bed gas multi-branch horizontal reservoir as claimed in claim 1, is characterized in that, by weight, comprises the following steps:
(1) get 100 parts, clear water, pour in high speed agitator slurry cup, regulate stirring velocity to (3-5) * 10
3r/min, adds 0.5～1 part of gelatinizing agent while stirring;
(2) to adding in (1) gained solution, help 0.5～1 part of jelly while stirring;
(3) in (2) described solution, add 0.1～0.2 part of high-temperature stabiliser while stirring, after feeding in raw material, regulate stirring velocity to (10-12) * 10
3r/min, continues to stir 10-30min, can use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410273886.7A CN104046337B (en) | 2014-06-18 | 2014-06-18 | A kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410273886.7A CN104046337B (en) | 2014-06-18 | 2014-06-18 | A kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof |
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| CN104046337A true CN104046337A (en) | 2014-09-17 |
| CN104046337B CN104046337B (en) | 2016-06-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105505346A (en) * | 2015-12-09 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Water-based drilling fluid for low-temperature formation drilling |
| CN106147733A (en) * | 2015-04-02 | 2016-11-23 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN111087980A (en) * | 2018-10-24 | 2020-05-01 | 中国石油天然气股份有限公司 | Drilling fluid and preparation method and application thereof |
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| CN106147733A (en) * | 2015-04-02 | 2016-11-23 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN106147733B (en) * | 2015-04-02 | 2019-03-12 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN105505346A (en) * | 2015-12-09 | 2016-04-20 | 中石化石油工程技术服务有限公司 | Water-based drilling fluid for low-temperature formation drilling |
| CN111087980A (en) * | 2018-10-24 | 2020-05-01 | 中国石油天然气股份有限公司 | Drilling fluid and preparation method and application thereof |
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| CN104046337B (en) | 2016-06-29 |
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Effective date of registration: 20210730 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106, Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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