CN105062435A - Micromolecular drilling fluid for coal bed gas horizontal wells - Google Patents
Micromolecular drilling fluid for coal bed gas horizontal wells Download PDFInfo
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- CN105062435A CN105062435A CN201510457966.2A CN201510457966A CN105062435A CN 105062435 A CN105062435 A CN 105062435A CN 201510457966 A CN201510457966 A CN 201510457966A CN 105062435 A CN105062435 A CN 105062435A
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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
- C09K2208/34—Lubricant additives
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A micromolecular drilling fluid for coal bed gas horizontal wells is composed of the following substances in percentage by weight: 1.0 to 2.0% of borehole stabilizing agent, 0.05 to 0.1% of flocculating agent, 0.5 to 1.0% of lubricant, and the balance being water. The provided micromolecular drilling fluid has the advantages that the performance of the drilling fluid on stabilizing the wall of the coal beds is strong, the yield of coal bed gas is high, the collapse of the wall of the coal bed gas well is avoided, at the same time the coal bed is protected; the frictional resistance is reduced, the useless solid phase is eliminated; and the coal bed protecting effect is better that that of a drilling fluid composed of clean water and polymers. The lubricating performance and flocculating performance of the provided micromolecular drilling fluids are close to those of polymer drilling fluid.
Description
Technical field
The present invention relates to CBM Drilling field of engineering technology, specifically a kind of coal bed gas horizontal well small molecules drilling fluid.
Background technology
Cbm development has entered the flourish stage in China, but China's coal-seam gas per-well production is general lower, in order to reduce costs, increase working efficiency, all adopts " low cost strategy " in the exploitation of coal-seam gas and drilling operation, drilling fluid.
For the exploitation of coal-seam gas, operator, first it is envisaged that the protected effect in coal seam and economy, therefore adopts clear water just to become primary selection as drilling fluid drilling well.Wash boring liquid has that cost is low, Solid Free, be conducive to coal seam protection and the advantage such as can to gather materials on the spot, and is widely used in straight well and horizontal well; But in the such as area such as Qinshui Basin In Shanxi Province, utilize clear water drilling well in the section of coal seam, easily occur that well collapses and the serious accident such as bury drills tool, thus cause huge financial loss.
In addition; with clear water cannot normally drilling well time; operator uses for reference the polymer drilling fluid used in oil/gas drilling; although polymer drilling fluid regular coal seam borehole wall ability is strong, drilling operation is relatively more smooth, and coal seam infringement is serious; after mining, output is lower; some well is not even given vent to anger, and therefore, guarantees that the stable of the coal seam borehole wall and the shielded problems demand of coal seam reservoir solve simultaneously.
Summary of the invention
In order to overcome above-mentioned technological deficiency, the object of the present invention is to provide that a kind of component is simple, applied widely, cost is low, coal seam borehole wall stability can be made to make again by force the coal bed gas horizontal well small molecules drilling fluid of reinforcement coal seam protected effect.
A kind of coal bed gas horizontal well small molecules of the present invention drilling fluid, is made up of the material of following massfraction: 1.0 ~ 2.0% hole stability agent, 0.05 ~ 0.1% flocculation agent, 0.5 ~ 1.0% lubricant, surplus are water.
The advantage of coal bed gas horizontal well small molecules drilling fluid of the present invention is: regular coal seam borehole wall ability is strong, and methane output is high, solves the contradiction between coal bed gas horizontal well hole collapse and coal seam protection; Reduce frictional resistance, remove useless solid phase, coal seam protected effect is better than clear water and polymer drilling fluid; The oilness of small molecules drilling fluid and flocculation ability are close to polymer drilling fluid.
Embodiment
A kind of coal bed gas horizontal well small molecules of the present invention drilling fluid, is made up of the material of following massfraction: 1.0 ~ 2.0% hole stability agent, 0.05 ~ 0.1% flocculation agent, 0.5 ~ 1.0% lubricant, surplus are water.
Preferably, described hole stability agent is ethyl diethylenetriamine, and its molecular formula is H
2nCH
2cH
2n (CH
2cH
2oH) CH
2cH
2nH
2, this treatment agent contains amido and hydroxyl, can firmly be adsorbed on clay mineral surface, stops clay mineral aquation, therefore has very strong inhibition, to improve the borehole wall stability of small molecules drilling fluid, reduces potential safety hazard;
Preferably, described flocculation agent is the one in polymerize aluminum chloride or polyaluminium sulfate, bodied ferric sulfate, poly-ferric chloride, and adsorptivity, coherency, sedimentation function are good.
Preferably, described lubricant is polyoxyethylene glycol, and its molecular weight is 200 to 600, is liquid-state viscosity fluid, soluble in water, reduces friction resistance during horizontal well drilling, thus improves the lubricity of drilling fluid.
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment one:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 2.0% hole stability agent, 0.1% flocculation agent, 1% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the wash boring liquid of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and wash boring liquid being used in drilling well;
3., performance measurement result: if table 1 to table 3 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 1 small molecules drilling fluid conventional performance index
Table 2 small molecules drilling fluid coal seam protected effect
Table 3 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 4# | Air | 15.36 |
| 5# | Small molecules drilling fluid | 11.66 |
| 6# | Clear water | 6.40 |
| 7# | Polymer drilling fluid | 12.88 |
Embodiment two:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 1.5% hole stability agent, 0.1% flocculation agent, 1% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and clear water being used in drilling well;
3., performance measurement result: if table 4 to table 6 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 4 small molecules drilling fluid conventional performance index
Table 5 small molecules drilling fluid coal seam protected effect
Table 6 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 11# | Air | 15.36 |
| 12# | Small molecules drilling fluid | 11.66 |
| 13# | Clear water | 6.40 |
| 14# | Polymer drilling fluid | 12.88 |
Embodiment three:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 1.5% hole stability agent, 0.075% flocculation agent, 0.75% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in clear water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and water being used in drilling well;
3., performance measurement result: if table 7 to table 9 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 7 small molecules drilling fluid conventional performance index
Table 8 small molecules drilling fluid coal seam protected effect table
Table 9 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 18# | Air | 17.34 |
| 19# | Small molecules drilling fluid | 13.98 |
| 20# | Clear water | 11.35 |
| 21# | Polymer drilling fluid | 15.22 |
Embodiment four:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 2.0% hole stability agent, 0.05% flocculation agent, 0.6% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in clear water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and water being used in drilling well;
3., performance measurement result: if table 10 to table 12 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 10 small molecules drilling fluid conventional performance index
Table 11 small molecules drilling fluid coal seam protected effect table
Table 12 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 25# | Air | 18.35 |
| 26# | Small molecules drilling fluid | 14.95 |
| 27# | Clear water | 11.57 |
| 28# | Polymer drilling fluid | 16.68 |
Embodiment five:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 1.0% hole stability agent, 0.05% flocculation agent, 0.5% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in clear water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in clear water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and water being used in drilling well;
3., performance measurement result: if table 13 to table 15 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 13 small molecules drilling fluid conventional performance index
Table 14 small molecules drilling fluid coal seam protected effect table
Table 15 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 32# | Air | 18.50 |
| 33# | Small molecules drilling fluid | 15.21 |
| 34# | Clear water | 10.44 |
| 35# | Polymer drilling fluid | 16.02 |
Embodiment six
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 1.0% hole stability agent, 0.05% flocculation agent, 1.0% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in clear water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and water being used in drilling well;
3., performance measurement result: if table 16 to table 18 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 16 small molecules drilling fluid conventional performance index
Table 17 small molecules drilling fluid coal seam protected effect table
Table 18 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 39# | Air | 17.34 |
| 40# | Small molecules drilling fluid | 13.98 |
| 41# | Clear water | 11.35 |
| 42# | Polymer drilling fluid | 15.22 |
Embodiment seven:
The performance comparison of small molecules drilling fluid and polymer drilling fluid and wash boring liquid is tested, and wherein, polymer drilling fluid is 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide, and surplus is water; The volume of wash boring liquid, polymer drilling fluid is identical with small molecules drilling fluid,
Testing sequence is as follows:
1., the configuration technique of small molecules drilling fluid: get appropriate water, add 1.0% hole stability agent, 0.1% flocculation agent, 0.5% lubricant while stirring successively; The treatment agent added is micromolecular treatment agent, and in clear water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the configuration technique of polymer drilling fluid: get appropriate water, add 0.1% soda ash, 0.2% xanthan gum, 0.2% polyacrylamide while stirring successively, in water, dissolution rate is fast; 2 hours are left standstill after treatment agent to be added all fully dissolves in water;
In like manner, the clear water of above-mentioned small molecules drilling fluid same volume is got;
2., performance measurement: perform according to " GB/T16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1 water-base drilling fluid ", carry out performance measurement when respectively small molecules drilling fluid, polymer drilling fluid and water being used in drilling well;
3., performance measurement result: if table 19 to table 21 is that small molecules drilling fluid compares with the properties of polymer drilling fluid, water respectively.
Table 19 small molecules drilling fluid conventional performance index
Table 20 small molecules drilling fluid coal seam protected effect table
Table 21 small molecules drilling fluid is to coal petrography intensity effect
| Coal core number | Soak medium | Uniaxial compressive strength/MPa |
| 46# | Air | 18.50 |
| 47# | Small molecules drilling fluid | 15.21 |
| 48# | Clear water | 10.44 |
| 49# | Polymer drilling fluid | 16.02 |
From above-described embodiment one to embodiment seven, test-results shows:
The test of table 1, table 4, table 7, table 10, table 13, table 16, table 19 proves, the viscosity of small molecules drilling fluid close to wash boring liquid, and is starkly lower than the viscosity of polymer drilling fluid; Small molecules drilling fluid lubricating performance and flocculation ability are all obviously better than wash boring liquid, and about the same with polymer drilling fluid, and small molecules drilling fluid reduces friction resistance in horizontal well drilling process, remove the injury of useless solid phase to coal seam simultaneously; (drilling fluid flocculation ability evaluation method, with reference to oil and gas industry standard SY/T5796-93 " flocculation agent evaluation method ", with kaolinic settling time characterizes after being mixed by 6% kaolin solution with drilling fluid equal-volume)
In table 2, table 5, table 8, table 11, table 14, table 17, table 20, Ka is coal heart air permeability, and Ko is coal heart layer water permeation rate, and Kd is the local water rate of permeation of the coal heart after polluting, and Kd/Ko is the permeability resume figure of the coal heart; It is less that the value larger expression coal heart of Kd/Ko is subject to drilling fluid contamination degree; Small molecules drilling fluid protecting coal seam successful is better than polymer drilling fluid and wash boring liquid;
For the coal heart pressurizes the uniaxial compressive strength of immersion after 24 hours in different media in table 3, table 6, table 9, table 12, table 15, table 18, table 21, uniaxial compressive strength larger coal heart stability is better, experimental result shows, small molecules drilling fluid stability is obviously better than clear water, and about the same with the viscosity of polymer drilling fluid; The coal heart number in each table is numbering.
The advantage of coal bed gas horizontal well small molecules drilling fluid of the present invention is: regular coal seam borehole wall ability is strong, and methane output is high, solves the contradiction between coal bed gas horizontal well hole collapse and coal seam protection; Reduce frictional resistance, remove useless solid phase, coal seam protected effect is better than clear water and polymer drilling fluid; The oilness of small molecules drilling fluid and flocculation ability are close to polymer drilling fluid.
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 (7)
1. a coal bed gas horizontal well small molecules drilling fluid, is characterized in that: be made up of the material of following massfraction: 1.0 ~ 2.0% hole stability agent, 0.05 ~ 0.1% flocculation agent, 0.5 ~ 1.0% lubricant, surplus are water.
2. coal bed gas horizontal well small molecules drilling fluid according to claim 1, is characterized in that: described hole stability agent is ethyl diethylenetriamine.
3. coal bed gas horizontal well small molecules drilling fluid according to claim 1 and 2, is characterized in that: described flocculation agent is the one in polymerize aluminum chloride or polyaluminium sulfate, bodied ferric sulfate, poly-ferric chloride.
4. coal bed gas horizontal well small molecules drilling fluid according to claim 1 and 2, is characterized in that: described lubricant is polyoxyethylene glycol.
5. coal bed gas horizontal well small molecules drilling fluid according to claim 3, is characterized in that: described lubricant is polyoxyethylene glycol.
6. coal bed gas horizontal well small molecules drilling fluid according to claim 4, is characterized in that: the molecular weight of described polyoxyethylene glycol is 200 to 600, is liquid-state viscosity fluid.
7. coal bed gas horizontal well small molecules drilling fluid according to claim 5, is characterized in that: the molecular weight of described polyoxyethylene glycol is 200 to 600, is liquid-state viscosity fluid.
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| CN201510457966.2A CN105062435B (en) | 2015-07-29 | 2015-07-29 | Coal bed gas horizontal well small molecule drilling fluid |
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Cited By (1)
| 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 |
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-
2015
- 2015-07-29 CN CN201510457966.2A patent/CN105062435B/en not_active Expired - Fee Related
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| US3127344A (en) * | 1964-03-31 | Cshjoh | ||
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| CN102002349A (en) * | 2010-11-12 | 2011-04-06 | 中国海洋石油总公司 | Seawater-based polyamine well completion fluid and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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