CN103525381A - Horizontal well drilling fluid for protecting coal bed gas reservoir - Google Patents
Horizontal well drilling fluid for protecting coal bed gas reservoir Download PDFInfo
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- CN103525381A CN103525381A CN201210227643.0A CN201210227643A CN103525381A CN 103525381 A CN103525381 A CN 103525381A CN 201210227643 A CN201210227643 A CN 201210227643A CN 103525381 A CN103525381 A CN 103525381A
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- coal bed
- water
- drilling fluid
- horizontal well
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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
- 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)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to horizontal well drilling fluid for protecting a coal bed gas reservoir, belonging to the technical field of chemical agents of coal bed gas exploitation engineering. The horizontal well drilling fluid is characterized by comprising water, an anti-swelling agent, a discharge aiding agent, an anti-scaling agent and a flocculating agent; on the basis of the weight of 100% of water in percentage by weight, the anti-swelling agent accounts for 0.2-0.5%, the discharge aiding agent accounts for 0.05-0.1%, the anti-scaling agent accounts for 0.001-0.005%, and the flocculating agent accounts for 0.2-0.5%. The anti-swelling agent is industrial grade potassium chloride, and the discharge aiding agent is nonylphenol polyoxyethylene ether OP-10; the anti-scaling agent is 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP); the flocculating agent is liquid poly aluminum chloride (PAC). The horizontal well drilling fluid disclosed by the invention has appropriate degree of mineralization, can not form scales after being mixed with coal bed water, is low in surface tension and strong in interfacial activity, can flow back easily after invading a low-permeability coal bed, and has the characteristics of good compatibleness with the coal bed, strong flocculation ability, low cost and environment-friendliness.
Description
Technical field:
The present invention relates to a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir, belong to coal-bed gas exploitation engineering chemistry agent technical field.
Background technology:
Along with China is increasing to the needs of the energy, coal-seam gas also more and more comes into one's own as one of unconventional Sweet natural gas (coal-seam gas, shale gas, compact sandstone gas and gas hydrate), and the exploitation of China's coal-seam gas at present has entered the flourish stage.
Compare with external coal-seam gas, the coal-seam gas of China has its special character, and that is exactly the low porosity and low permeability characteristic in coal seam, i.e. per-well production is low, and this low yield characteristic has also determined the low cost strategy of China's cbm development.The application that employing horizontal well carries out coal-bed gas exploitation is more and more extensive, mostly adopts at present clear water as the drilling fluid of horizontal well.Wash boring liquid have cost low, without advantages such as solid phases, also substantially can meet the job requirements of horizontal well drilling engineering.
But wash boring liquid also exists following several respects not enough: 1, the salinity of clear water is on the low side, easily causes the hydration swelling of coal seam CLAY MINERALS AND THEIR SIGNIFICANCE, thereby stop up the seepage channel of coal-seam gas; 2, take from the clear water on earth's surface and underground coal seam water and be incompatible, have scale formation; 3, in positive pressure differential drilling well situation, a little less than the clear water of invading hypotonic coal seam returns row's ability, totally unfavorable to the draining exploitation in coal-seam gas later stage; 4, a little less than clear water flocculation ability, the tiny ickings of drill bit fragmentation can not be removed in time, thereby be caused tiny ickings invaded coal layer to cause solid phase obstruction.
In order to protect coalbed methane reservoir, improve the output of coal-bed gas exploitation, must improve existing wash boring liquid, to adapt to the requirement of Protective Techniques o f Coal Bed Gas Reservoir, meet the actual demand that coal-bed gas exploitation is produced.
Summary of the invention:
In order to overcome the deficiencies in the prior art; the object of the present invention is to provide a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir; it has suitable salinity; non-scaling after mixing with coal seam water; surface tension is lower; interfacial activity is strong, invades behind hypotonic coal seam the easily row of returning, and has with coal seam compatibleness is good, flocculation ability is strong, cost is low, eco-friendly feature.
The present invention realizes above-mentioned purpose by following technical solution.
A kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir provided by the present invention, it consists of water, expansion-resisting agent, cleanup additive, scale inhibitor, flocculation agent; It is benchmark that the weight percent of each component be take the weight of 100% water, and the per-cent that each additive accounts for the weight of water is:
Expansion-resisting agent: 0.2～0.5%;
Cleanup additive: 0.05～0.1%;
Scale inhibitor: 0.001～0.005%;
Flocculation agent: 0.2～0.5%;
Described expansion-resisting agent is technical grade Repone K, utilizes the anti-swollen mechanism of potassium ion uniqueness, can effectively suppress coal seam CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling;
Described cleanup additive is polyoxyethylene nonylphenol ether OP-10;
Described scale inhibitor is hydroxy ethylene diphosphonic acid HEDP;
Described flocculation agent is liquid aluminium polychloride PAC.
The present invention has following beneficial effect compared with prior art:
1, good with coal seam compatibleness, there is suitable salinity, can not cause coal seam CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling, after mixing with coal seam water, there will not be scale formation.
2, interfacial activity is strong, has lower surface tension, invades behind hypotonic coal seam than being easier to the row of returning.
3, flocculation ability is strong, for the tiny ickings after drill bit fragmentation, can produce in time throwing out, and combined ground solid control equipment is removed fast, thereby effectively reduces the obstruction infringement that mud solid phase causes coal seam.
Embodiment:
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1:
A kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir provided by the present invention, it is benchmark that the weight percent of each component be take the weight of 100% water, the per-cent that each additive accounts for the weight of water is:
Expansion-resisting agent: 0.2%; Cleanup additive: 0.05%; Scale inhibitor: 0.001%; Flocculation agent: 0.2%.
Compound method: because above-mentioned each additive is small molecules or degraded material, dissolve ratio faster and prepare simply, each component water is fully dissolved to rear mixing.
Embodiment 2:
A kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir provided by the present invention, it is benchmark that the weight percent of each component be take the weight of 100% water, the per-cent that each additive accounts for the weight of water is:
Expansion-resisting agent: 0.3%; Cleanup additive: 0.05%; Scale inhibitor: 0.003%; Flocculation agent: 0.5%.
Compound method: because above-mentioned each additive is small molecules or degraded material, dissolve ratio faster and prepare simply, each component water is fully dissolved to rear mixing.
Embodiment 3:
A kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir provided by the present invention, it is benchmark that the weight percent of each component be take the weight of 100% water, the per-cent that each additive accounts for the weight of water is:
Expansion-resisting agent: 0.5%; Cleanup additive: 0.1%; Scale inhibitor: 0.005%; Flocculation agent: 0.4%.
Compound method: because above-mentioned each additive is small molecules or degraded material, dissolve ratio faster and prepare simply, each component water is fully dissolved to rear mixing.
Drilling Fluids for Horizontal Wells to the protection coalbed methane reservoir of embodiment 1, embodiment 2 and embodiment 3 preparations carries out performance measurement according to State Standard of the People's Republic of China GB/T 16783.1-2006 " industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid ".
Property of drilling fluid after mensuration is as shown in the table.
Claims (5)
1. protect a Drilling Fluids for Horizontal Wells for coalbed methane reservoir, it is characterized in that it consists of water, expansion-resisting agent, cleanup additive, scale inhibitor, flocculation agent; It is benchmark that the weight percent of each component be take the weight of 100% water, and the per-cent that each additive accounts for the weight of water is:
Expansion-resisting agent: 0.2～0.5%;
Cleanup additive: 0.05～0.1%;
Scale inhibitor: 0.001～0.005%;
Flocculation agent: 0.2～0.5%.
2. a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir according to claim 1, is characterized in that described expansion-resisting agent is technical grade Repone K.
3. a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir according to claim 1, is characterized in that described cleanup additive is polyoxyethylene nonylphenol ether OP-10.
4. a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir according to claim 1, is characterized in that described scale inhibitor is hydroxy ethylene diphosphonic acid HEDP.
5. a kind of Drilling Fluids for Horizontal Wells of protecting coalbed methane reservoir according to claim 1, is characterized in that described flocculation agent is liquid aluminium polychloride PAC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227643.0A CN103525381B (en) | 2012-07-04 | 2012-07-04 | A kind of horizontal well drilling liquid protecting coalbed methane reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227643.0A CN103525381B (en) | 2012-07-04 | 2012-07-04 | A kind of horizontal well drilling liquid protecting coalbed methane reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103525381A true CN103525381A (en) | 2014-01-22 |
| CN103525381B CN103525381B (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210227643.0A Expired - Fee Related CN103525381B (en) | 2012-07-04 | 2012-07-04 | A kind of horizontal well drilling liquid protecting coalbed methane reservoir |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104893690A (en) * | 2015-06-25 | 2015-09-09 | 山东得顺源石油科技有限公司 | Low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system |
| CN105062435A (en) * | 2015-07-29 | 2015-11-18 | 长江大学 | Micromolecular drilling fluid for coal bed gas horizontal wells |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597488A (en) * | 2009-06-26 | 2009-12-09 | 中国石油天然气股份有限公司 | High solid phase drilling fluid filter cake removing treatment fluid |
| CN102250602A (en) * | 2011-05-06 | 2011-11-23 | 河北科技大学 | Composite acid blockage removing agent for oil well |
-
2012
- 2012-07-04 CN CN201210227643.0A patent/CN103525381B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597488A (en) * | 2009-06-26 | 2009-12-09 | 中国石油天然气股份有限公司 | High solid phase drilling fluid filter cake removing treatment fluid |
| CN102250602A (en) * | 2011-05-06 | 2011-11-23 | 河北科技大学 | Composite acid blockage removing agent for oil well |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104893690A (en) * | 2015-06-25 | 2015-09-09 | 山东得顺源石油科技有限公司 | Low-soil-phase high-density calcium-resistant saturated salt water drilling fluid system |
| CN105062435A (en) * | 2015-07-29 | 2015-11-18 | 长江大学 | Micromolecular drilling fluid for coal bed gas horizontal wells |
| CN105062435B (en) * | 2015-07-29 | 2017-12-29 | 长江大学 | Coal bed gas horizontal well small molecule drilling fluid |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN103525381B (en) | 2016-06-15 |
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