CN104046337B - A kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof - Google Patents
A kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof Download PDFInfo
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- CN104046337B CN104046337B CN201410273886.7A CN201410273886A CN104046337B CN 104046337 B CN104046337 B CN 104046337B CN 201410273886 A CN201410273886 A CN 201410273886A CN 104046337 B CN104046337 B CN 104046337B
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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
Abstract
The invention discloses a kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof, this drilling fluid is made up of the raw material of following portions by weight: 100 parts of clear water, gelatinizing agent 0.5～1 part, helps colloid 0.5～1 part, high-temperature stabilizer 0.1～0.2 part.Wherein, gelatinizing agent is made up of by weight 4:1 with hexadecylpyridinium chloride cetyl trimethylammonium bromide；Colloid is helped to be made up of by weight 1:1 with potassium chloride sodium salicylate；High-temperature stabilizer is sodium thiosulfate.It is viscous that this drilling fluid does not use bentonite or polymer to carry; but use Small molecular surfactant to form micelle and carry out thickening; have that to take lithology good; broken glue is fast and thorough; can ensure that while protecting coalbed methane reservoir to greatest extent well cleans; reducing drilling fluid washing away the borehole wall, thus reducing the risk of bit freezing, alleviating the contradiction between encountered drilling safety and reservoir protection in current coal bed gas multi-branch horizontal drilling process to a certain extent.
Description
Technical field
The present invention relates to a kind of drilling fluid, in particular for the cleaning drilling fluid and preparation method thereof of coal bed gas multi-branch horizontal reservoir.
Background technology
Coal bed gas is increasingly subject to pay attention to as a kind of non-conventional gas resource, and China's coal bed gas reserves are quite abundant, and further investigation CBM exploration and development technology is imperative.
20 century 70s, abroad begin to the research work of cbm development aspect, theory and the production practice of a set of maturation are defined, but the work of the CBM exploration and development poweies such as the U.S. is many in low order coal bed gas, the main multi-branched horizontal well adopting barefoot completion, it is common to use clear water is as drilling fluid.
China starts to carry out the research of coal bed gas aspect from the nineties in 20th century, after 2005, cbm development enters boost phase, initial period CBM Drilling liquid is always up based on conventional oil gas well drilling fluid, carry out the improvement being correlated with according to some presentation characteristics of coal seam, and be mostly the improvement of the straight well drilling fluid for cased hole completion.In recent years, the multi-branched horizontal well of China's coal bed gas test well many employings barefoot completion, adopt conventional oil gas well drilling fluid to coalbed methane reservoir infringement greatly, be often drilled well gas production almost nil；Owing to China's cbm development is concentrated mainly on high-order coal aspect, low-order coal of comparing, its intensity difference, easily cave in, adopt clear water as drilling fluid, take lithology difference, the borehole wall is washed away seriously, drilling process very easily occurs borehole well instability, and landwaste can not be carried outside in time, thus frequently there is lock of tool drilling.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 a kind of special drilling fluid of coal bed gas multi-branch horizontal reservoir that can take into account wellbore stability and reservoir protection very urgent, the focus of coal bed gas security development technical research certainly will be become.
Summary of the invention
The present invention is directed to the contradiction between encountered hole collapse and reservoir protection in current coal bed gas multi-branch horizontal drilling process; a kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir and preparation method thereof is provided; this drilling fluid has that to take lithology glue good, broken fast and thoroughly; drilling fluid washing away the borehole wall can be reduced as far as while protecting reservoir to greatest extent; ensure well cleaning; thus reducing the risk of bit freezing so that drilling safety and reservoir protection are achieved simultaneously.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir, by weight, is made up of following component:
Wherein, gelatinizing agent is made up of by weight 4:1 with hexadecylpyridinium chloride cetyl trimethylammonium bromide；Colloid is helped to be made up of by weight 1:1 with potassium chloride sodium salicylate.
Described high-temperature stabilizer is sodium thiosulfate.
The preparation method of the above-mentioned cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir, it is characterised in that by weight, comprise the following steps:
(1) take 100 parts of clear water, pour in high speed agitator slurry cup, regulate mixing speed to (3-5) * 103R/min, adds gelatinizing agent 0.5～1 part while stirring；
(2) in (1) gained solution, addition helps colloid 0.5～1 part while stirring；
(3) in (2) described solution, add high-temperature stabilizer 0.1～0.2 part while stirring, after reinforced, regulate mixing speed to (10-12) * 103R/min, continues stirring 10-30min, can use.
The method have the advantages that
(1) Solid Free, material therefor is soluble small molecular compound, will not block coalbed methane reservoir hugger；
(2) ratio of dynamic shear force/yield value to plastic viscosity is high, takes lithology good, and borehole wall souring is little；
(3) broken glue is fast and noresidue, and coalbed methane reservoir injury is little.
Detailed description of the invention
The cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir of the present invention, by weight, is made up of following component:
Wherein, gelatinizing agent is made up of by weight 4:1 with hexadecylpyridinium chloride cetyl trimethylammonium bromide；Colloid is helped to be made up of by weight 1:1 with potassium chloride sodium salicylate.
Described high-temperature stabilizer is sodium thiosulfate.
The preparation method of the above-mentioned cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir, it is characterised in that by weight, comprise the following steps:
(1) take 100 parts of clear water, pour in high speed agitator slurry cup, regulate mixing speed to (3-5) * 103R/min, adds gelatinizing agent 0.5～1 part while stirring；
(2) in (1) gained solution, addition helps colloid 0.5～1 part while stirring；
(3) in (2) described solution, add high-temperature stabilizer 0.1～0.2 part while stirring, after reinforced, regulate mixing speed to (10-12) * 103R/min, continues stirring 10-30min, can use.
Below in conjunction with detailed description of the invention, the present invention is described in further detail:
Embodiment 1
(1) take clear water 400mL, pour in high speed agitator slurry cup, regulate mixing speed to 4*103R/min, adds 2g gelatinizing agent (mixed by 1.6g cetyl trimethylammonium bromide and 0.4g hexadecylpyridinium chloride and form) while stirring；
(2) in (1) gained solution, add 2g while stirring help colloid (mixed by 1g sodium salicylate and 1g potassium chloride and form)；
(3) in (2) described solution, add 0.4g high-temperature stabilizer (sodium thiosulfate) while stirring, after reinforced, regulate mixing speed to 11*103R/min, continues stirring 20min, namely obtains the cleaning drilling fluid that coal bed gas multi-branch horizontal reservoir of the present invention is special.
Determine the cleaning drilling fluid rheological parameter after room temperature and high temperature ageing for coal bed gas multi-branch horizontal prepared as stated above separately below.
High temperature ageing method: the drilling fluid prepared as stated above is loaded in airtight high-temperature tank, then high-temperature tank is put in the drilling fluid special-purpose high temperature roller furnace that temperature is 120 DEG C, open high temp roller furnace rolling switch, high temperature takes out after rolling 16h, pour out from high-temperature tank 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, it is possible to meets horizontal well and takes rock demand, and temperature resistance is good.
Table 1 gained drilling fluid rheology of the present invention and temperature resistance evaluation result
Have rated the broken glue effect of the special cleaning drilling fluid of the coal bed gas multi-branch horizontal reservoir prepared as stated above below.
Gel breaking method: pour in high speed agitator slurry cup by the drilling fluid prepared as stated above, regulates mixing speed to 4*103R/min, adds 0.8g gel breaker (Ammonium persulfate .) while stirring in slurry cup.
Broken glue effect evaluation method: measure the apparent viscosity of 5min, 10min, 20min gained drilling fluid of the present invention after breaking before glue and adding gel breaker respectively, reaches the time of below 2mPa.s for the completely broken glue time with apparent viscosity.
Table 2 experimental data shows: gained drilling fluid of the present invention adds gel breaker only 10min, and its apparent viscosity is just reduced to 2mPa.s, illustrates that its broken glue is fast and noresidue.
Table 2 gained drilling fluid of the present invention breaks glue effect assessment result
In sum, present disclosure is not limited in the above embodiments, and the knowledgeable people in same area can propose other embodiment easily within technological guidance's thought of the present invention, but this embodiment is all included within the scope of the present invention.
Claims (2)
1. the cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir, it is characterised in that by weight, be made up of following component:
Wherein, gelatinizing agent is made up of by weight 4:1 with hexadecylpyridinium chloride cetyl trimethylammonium bromide；Helping colloid to be made up of by weight 1:1 with potassium chloride sodium salicylate, described high-temperature stabilizer is sodium thiosulfate.
2. the preparation method of the cleaning drilling fluid for coal bed gas multi-branch horizontal reservoir as claimed in claim 1, it is characterised in that by weight, comprise the following steps:
(1) take 100 parts of clear water, pour in high speed agitator slurry cup, regulate mixing speed to (3-5) * 103R/min, adds gelatinizing agent 0.5～1 part while stirring；
(2) in (1) gained solution, addition helps colloid 0.5～1 part while stirring；
(3) in (2) described solution, add high-temperature stabilizer 0.1～0.2 part while stirring, after reinforced, regulate mixing speed to (10-12) * 103R/min, continues stirring 10-30min, can use.
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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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| 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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| CN104046337B true CN104046337B (en) | 2016-06-29 |
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| 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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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. |