CN103788933A - Coalbed methane (CBM) horizontal well drilling fluid - Google Patents
Coalbed methane (CBM) horizontal well drilling fluid Download PDFInfo
- Publication number
- CN103788933A CN103788933A CN201410028374.4A CN201410028374A CN103788933A CN 103788933 A CN103788933 A CN 103788933A CN 201410028374 A CN201410028374 A CN 201410028374A CN 103788933 A CN103788933 A CN 103788933A
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- China
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- drilling fluid
- horizontal well
- cbm
- coal bed
- bed gas
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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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- 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 a coalbed methane (CBM) horizontal well drilling fluid, belonging to the technical field of oil and gas drilling engineering. The CBM horizontal well drilling fluid is characterized in that the drilling fluid is water solution which comprises a thickening agent with the mass percent of 0.3-0.5% and a discharge aiding agent with the mass percent of 0.1-0.3%, wherein the thickening agent is xanthan gum, and the discharge aiding agent is nonylphenol polyoxyethylene ether. The CBM horizontal well drilling fluid has the advantages of being simple in components, convenient in synthesis, good in using effect and wide in application scope, meeting the demand for the density for supporting the wall of a well, being free from solid phase and the like, and well solves the contradiction between CBM horizontal well wall collapse and coal bed protection, thus having wide application prospect.
Description
Technical field
The invention belongs to oil/gas drilling field of engineering technology, particularly relate to a kind of coal bed gas horizontal well drilling fluid.
Background technology
Shallow and formation temperature is lower based on CBM Drilling well before cbm development, require also lower to drilling outfit and property of drilling fluid.At present, along with CBM Drilling quantity is increasing, especially horizontal well, multi-branched horizontal well are applied more prevalent in cbm development, be that coal bed gas horizontal well drilling well also has suitable complicacy, be mainly manifested in contradiction between wellbore stability and coal seam reservoir protection more outstanding, this depends primarily on the drilling fluid that CBM Drilling adopts, and some drilling fluid wellbore stability abilities are good but coal seam protective value is poor, and production capacity is not up to standard holds one's breath even after causing coal bed gas well to be gone into operation; And some drilling fluids coal seam protection is effective, but in drilling process, hole collapse is serious, and down-hole complex accident is continuous, the serious accident such as cause that well is scrapped even.
For cbm development, first operator considers coal seam reservoir protection and economy, and therefore adopting clear water to creep into just becomes natural selection.Clear water have cost low, be conducive to coal seam protection and the advantage such as can gather materials on the spot without solid phase, in straight well and horizontal well, be widely used.Due to the singularity of horizontal well; use at present clear water to creep in the section of coal seam to occur the well casualty ratio of accidents that collapses higher; even occur that thereby the serious accidents such as bury drills tool cause tremendous economic loss, have the technical problems such as contradiction between wellbore stability and coal seam reservoir protection.
Summary of the invention
The present invention provides a kind of coal bed gas horizontal well drilling fluid for solving the technical problem existing in known technology.
The object of this invention is to provide a kind of component simple, it is convenient to synthesize, and result of use is good, applied widely, meets and supports borehole wall demand density, has again without solid phase feature the coal bed gas horizontal well drilling fluid of the features such as effective protection coal reservoir simultaneously.
The present invention can meet the technical requirements of coal bed gas horizontal well wellbore stability without solid phase water-base drilling fluid, and without solid phase.Coal bed gas horizontal well, without solid phase water-base drilling fluid system formulation, not only can solve coal bed gas horizontal well drilling process borehole well instability problem, and have protection coal reservoir function.
Table 1 coal bed gas horizontal well property of drilling fluid index
Coal bed gas horizontal well used without solid phase water-base drilling fluid, it consists of: clear water+0.3-0.5% tackifier+0.1-0.3% cleanup additive+density adjuster, wherein tackifier adopt xanthan gum, cleanup additive is polyoxyethylene nonylphenol ether (OP-10), density adjuster adopts soluble salt, can be single industrial sodium-chlor, Repone K, calcium chloride, sodium formiate and potassium formiate, or mixture between them.
The technical scheme that coal bed gas horizontal well drilling fluid of the present invention is taked is:
A kind of coal bed gas horizontal well drilling fluid, is characterized in: drilling fluid is the aqueous solution, in the aqueous solution, containing tackifier and the mass percent that mass percent is 0.3-0.5% is 0.1-0.3% cleanup additive; Tackifier are xanthan gum, and cleanup additive is polyoxyethylene nonylphenol ether.
Coal bed gas horizontal well drilling fluid of the present invention can also adopt following technical scheme:
Described coal bed gas horizontal well drilling fluid, is characterized in: it is 0.01-0.6% soluble salt density adjuster that drilling fluid contains mass percent.
Described coal bed gas horizontal well drilling fluid, is characterized in: the density of drilling fluid is 1.01-1.60g/cm
3.
Described coal bed gas horizontal well drilling fluid, is characterized in: soluble salt density adjuster is one or more in sodium-chlor, Repone K, calcium chloride, sodium formiate, potassium formiate.
Advantage and positively effect that the present invention has are:
Coal bed gas horizontal well drilling fluid is owing to having adopted the brand-new technical scheme of the present invention; compared with prior art; coal bed gas horizontal well drilling fluid of the present invention; can not only meet coal bed gas horizontal well drilling engineering needs; but also protection coal reservoir at utmost: 1. adopt soluble salt regulating density; Auto-regulating System of Density of Heavy Medium wide ranges, can be from 1.00-1.60g/cm
3, meet coal bed gas horizontal well and support the needed density of the borehole wall; 2. have without solid phase feature, thoroughly solve the solid phase blockage problem that in drilling fluid, solid phase causes coal seam; 3. surface tension is low, and the water of invaded coal layer easily returns discharges coal seam, is conducive to the draining exploitation in coal-seam gas later stage; 4. drilling fluid has higher ratio of dynamic shear force/yield value to plastic viscosity, is conducive to coal bed gas horizontal well well clean.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, be described in detail as follows:
Embodiment 1
A kind of coal bed gas horizontal well drilling fluid, its formula and blending process process:
Drilling fluid composition: contain tackifier, cleanup additive and soluble salt in clear water.Tackifier are xanthan gum, mass percent 0.3%; Cleanup additive is polyoxyethylene nonylphenol ether, and mass percent is 0.2%; Soluble salt is industrial sodium-chlor, and drilling fluid density is 1.15g/cm
3.
Blending process: get clear water, add tackifier under agitation condition, add industrial sodium-chlor regulating density to 1.15g/cm after fully dissolving
3, finally add cleanup additive, after fully dissolving, place 2h.
Performance measurement: carry out according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ".
Property of drilling fluid: table 1 is the performance (surface tension is room temperature measuring) of preparation clay-free drilling fluid.
Table 1 property of drilling fluid
Embodiment 2
A kind of coal bed gas horizontal well drilling fluid, its formula and blending process process:
Drilling fluid composition: contain tackifier, cleanup additive and soluble salt in clear water.Tackifier are xanthan gum, mass percent 0.5%; Cleanup additive is polyoxyethylene nonylphenol ether, and mass percent is 0.2%; Soluble salt is industrial calcium chloride, and drilling fluid density is 1.20g/cm
3.
Blending process: get clear water, add tackifier under agitation condition, add industrial calcium chloride regulating density to 1.20g/cm after fully dissolving
3, finally add cleanup additive, after fully dissolving, place 2h.
Performance measurement: carry out according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ".
Property of drilling fluid: table 2 is the performance (surface tension is room temperature measuring) of preparation clay-free drilling fluid.
Table 2 property of drilling fluid
Embodiment 3
A kind of coal bed gas horizontal well drilling fluid, its formula and blending process process:
Drilling fluid composition: contain tackifier, cleanup additive and soluble salt in clear water.Tackifier are xanthan gum, mass percent 0.4%; Cleanup additive is polyoxyethylene nonylphenol ether, and mass percent is 0.1%; Soluble salt is industrial potassium formiate, and drilling fluid density is 1.40g/cm
3.
Blending process: get clear water, add tackifier under agitation condition, add industrial potassium formiate regulating density to 1.40g/cm after fully dissolving
3, finally add cleanup additive, after fully dissolving, place 2h.
Performance measurement: carry out according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ".
Property of drilling fluid: table 3 is the performance (surface tension is room temperature measuring) of preparation clay-free drilling fluid.
Table 3 property of drilling fluid
Claims (4)
1. a coal bed gas horizontal well drilling fluid, is characterized in that: drilling fluid is the aqueous solution, and in the aqueous solution, containing tackifier and the mass percent that mass percent is 0.3-0.5% is 0.1-0.3% cleanup additive; Tackifier are xanthan gum, and cleanup additive is polyoxyethylene nonylphenol ether.
2. coal bed gas horizontal well drilling fluid according to claim 1, is characterized in that: it is 0.01-0.6% soluble salt density adjuster that drilling fluid contains mass percent.
3. coal bed gas horizontal well drilling fluid according to claim 2, is characterized in that: the density of drilling fluid is 1.01-1.60g/cm
3.
4. according to the coal bed gas horizontal well drilling fluid described in claim 2 or 3, it is characterized in that: soluble salt density adjuster is one or more in sodium-chlor, Repone K, calcium chloride, sodium formiate, potassium formiate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028374.4A CN103788933A (en) | 2014-01-21 | 2014-01-21 | Coalbed methane (CBM) horizontal well drilling fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028374.4A CN103788933A (en) | 2014-01-21 | 2014-01-21 | Coalbed methane (CBM) horizontal well drilling fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103788933A true CN103788933A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410028374.4A Pending CN103788933A (en) | 2014-01-21 | 2014-01-21 | Coalbed methane (CBM) horizontal well drilling fluid |
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Citations (7)
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|---|---|---|---|---|
| CN1664048A (en) * | 2005-02-05 | 2005-09-07 | 大庆油田有限责任公司 | Fracturing working liquid for container rock containing travertine |
| CN101665685A (en) * | 2009-09-14 | 2010-03-10 | 天津师范大学 | Oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery |
| CN101693825A (en) * | 2009-11-05 | 2010-04-14 | 中国石油大学(北京) | Gel-type extracting agent for drilling fluid or well completion fluid and preparation method thereof |
| CN101935519A (en) * | 2010-08-09 | 2011-01-05 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid and preparation method thereof |
| CN102977872A (en) * | 2012-11-29 | 2013-03-20 | 辽宁石油化工大学 | Enhanced foam oil-displacing agent for improving oil recovery rate in tertiary oil recovery, and preparation method thereof |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN103396771A (en) * | 2013-07-24 | 2013-11-20 | 中国地质大学（武汉） | Degradable drilling fluid based on nano material |
-
2014
- 2014-01-21 CN CN201410028374.4A patent/CN103788933A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664048A (en) * | 2005-02-05 | 2005-09-07 | 大庆油田有限责任公司 | Fracturing working liquid for container rock containing travertine |
| CN101665685A (en) * | 2009-09-14 | 2010-03-10 | 天津师范大学 | Oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery |
| CN101693825A (en) * | 2009-11-05 | 2010-04-14 | 中国石油大学(北京) | Gel-type extracting agent for drilling fluid or well completion fluid and preparation method thereof |
| CN101935519A (en) * | 2010-08-09 | 2011-01-05 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid and preparation method thereof |
| CN102977872A (en) * | 2012-11-29 | 2013-03-20 | 辽宁石油化工大学 | Enhanced foam oil-displacing agent for improving oil recovery rate in tertiary oil recovery, and preparation method thereof |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN103396771A (en) * | 2013-07-24 | 2013-11-20 | 中国地质大学（武汉） | Degradable drilling fluid based on nano material |
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Application publication date: 20140514 |