CN103589406A - Compound saltwater drilling fluid for plugging fractures of coal seam - Google Patents
Compound saltwater drilling fluid for plugging fractures of coal seam Download PDFInfo
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- CN103589406A CN103589406A CN201310563176.3A CN201310563176A CN103589406A CN 103589406 A CN103589406 A CN 103589406A CN 201310563176 A CN201310563176 A CN 201310563176A CN 103589406 A CN103589406 A CN 103589406A
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- coal seam
- drilling fluid
- shutoff
- barite
- calcium carbonate
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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
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention relates to a compound saltwater drilling fluid for plugging fractures of a coal seam, and belongs to the field of petroleum drilling. The compound saltwater drilling fluid is characterized by comprising components in percentage by mass as follows: 6%-8% of calcium carbonate, 4%-6% of emulsified asphalt powder, 10%-12% of barite, 2%-4% of limestone powder, 3%-4% of carboxymethyl starch, 8%-10% of sodium formate, 4%-6% of industrial salt, 2%-4% of potassium chloride, 0.6%-0.8% of polyanionic cellulose and the balance of clear water, wherein emulsified asphalt, calcium carbonate, barite and limestone powder are generally termed as plugging materials. By means of the compound saltwater drilling fluid, the one-time success rate of well completion of an inclined shaft section is increased greatly, the collapse of the coal seam is greatly reduced, the construction period of the inclined shaft section is shortened, and the work efficiency is improved.
Description
Technical field
The present invention relates to a kind of drilling fluid, particularly a kind of composite salt aqueous drilling fluid of shutoff cracks in coal seam, belongs to field of oil drilling.
Background technology
Quiet southern horizontal well is in existing drilling operation process, collapses and occur frequently in lower curved section coal seam.Conventional is composite salt aqueous drilling fluid system, in this system, the content of shutoff material was lower in the past, and often in the process that makes a trip after drilling coal seam, collapse in coal seam, caused bury drills tool well filling sidetracking, financial loss is huge, and the principal element that causes coal seam to be collapsed is as follows:
While 1, creeping into coal seam, working measure and construction parameter are not in place, and coal seam is caused compared with great machinery injury, have promoted the further formation at Ge Lihe joint, coal seam, and drilling fluid enters and forms swelling pressure induction coal seam after cracks in coal seam and collapse.
While 2, creeping into coal seam, in drilling fluid, the content of temporary shielding blocking is less, can not fill and shutoff cracks in coal seam, causes drilling fluid to enter cracks in coal seam and forms the swelling pressure, when fluid column pressure is less than these swelling pressure, has promoted collapsing of coal seam.
3, the sticky shield ring of cutting the formation of surface, the nearly borehole wall of erosion damage coal seam of lower drilling fluid, has promoted the further formation at Ge Lihe joint, coal seam, and induction drilling fluid enters cracks in coal seam and causes coal seam to collapse.
Summary of the invention
The object of the invention is the defect existing in prior art in order to overcome, a kind of composite salt aqueous drilling fluid of shutoff cracks in coal seam is provided, and it improves lower curved section completion one-time success rate greatly, has greatly reduced coal seam and has collapsed, shorten lower curved section construction period, improved working efficiency.
Technical scheme of the present invention is: a kind of composite salt aqueous drilling fluid of shutoff cracks in coal seam, is characterized in that: it is comprised of following component and mass percent thereof: detailed catalogue calcium carbonate is 6-8%, emulsified bitumen powder is 4-6%, barite is 10-12%, limestone powder is 2-4%, carboxymethyl starch is that 3-4%, sodium formiate are that 8-10%, Industrial Salt are that 4-6%, Repone K are that 2-4%, Polyanionic Cellulose are that 0.6-0.8%, all the other components are clear water; Described emulsified bitumen, calcium carbonate, barite and limestone powder are generically and collectively referred to as shutoff material.
The granularity of described detailed catalogue calcium carbonate is that the granularity of 1-20 μ m, emulsified bitumen powder is that 0.1-10 μ m, barite granularity are that the granularity of 10-100 μ m, limestone powder is 20-160 μ m.
Use the technique of this drilling fluid to comprise following technical measures:
1) while controlling, creep into: divide/rice of 10-20 during brill, parameter: the pressure of the drill 1-2 ton, rotating speed 30r/min, discharge capacity 30L/S, suitably adjusts when in drilling process, parameter is according to brill among a small circle; Forbid that coal seam section is forbidden the operation of sliding in the fixed point circulation of coal seam rapid lapse of time, reduce deviational survey, in drilling process, keep a close eye on while boring, moment of torsion, have abnormal conditions, stop immediately creeping into, can not termination of pumping, above propose observation;
2) drilling fluid requires: 1. coal seam open before shutoff material barite in drilling fluid between hole deviation 45-55 degree, limestone powder, detailed catalogue calcium carbonate for and emulsified bitumen powder and other component carboxymethyl starch, sodium formiate, Industrial Salt must reach desired formula ratio for, Repone K, Polyanionic Cellulose; Make property of drilling fluid be adjusted to proportion 1.31-1.33 g/cm
3, viscosity 80-90s, dehydration≤2ml/30min, first losing time > 200s, shutoff total amount of material reaches 22-30%; 2. opening the anti-permeability time of coal seam mud cake can not be lower than 100s, anti-permeable dehydration < 2ml/30min, HTHP < 6ml.
3) before coal seam section pulls out of hole with sub-surface, fully circulating fluid more than at least 2 weeks, guarantees that well is clean, and during circulating fluid, drilling tool rotating speed consistent 30 r/min when normally creeping into coal seam, avoid the mechanical wounding to coal seam; Every 3 post pit shafts that pull out of hole must be filled mud.
4) playing coal seam section has and is hampered, on carry can not be over 15 tons, otherwise will after 2-3 post under drilling tool, avoid coal seam section turn on pump circulation more than at least 30 minutes, again carry seeing if there is on again and be hampered, if without being hampered, normally pull out of hole, if having, be hampered, must, by drilling tool again 2-3 post next time, avoid coal seam and carry out circular treatment mud; Under be drilled in coal seam and be hampered, turn on pump small displacement reaming, avoids large discharge capacity to wash away coal seam.
Advanced part of the present invention is the sealing characteristics of drilling fluid to introduce permeable concept, and property of drilling fluid ratio was proposed to higher requirement in the past.
Technique effect of the present invention is:
The present invention is based on existing composite salt aqueous drilling fluid system, ratio and the dosage of different-grain diameter shutoff material have been adjusted, with proportioning and dosage contrast in the past, in drilling fluid, add different-grain diameter rank rigid particles and softening particulate material, find out suitable proportioning and dosage and safeguard coal seam wellbore stability, lower curved section completion one-time success rate improves greatly, greatly reduced the complexity collapsing and cause in coal seam, shortened lower curved section construction period, individual well shortening construction cycle obviously, provides strong technical support for making tranquil the speed-raising work of southern horizontal well; Be specially adapted to area, coal seam, lower ancient horizontal well lower curved section Benxi.
Below in conjunction with embodiment, the present invention is described further, but not as a limitation of the invention.
Embodiment
Embodiment 1
A composite salt aqueous drilling fluid for cracks in coal seam, it is comprised of following component and mass percent thereof: detailed catalogue calcium carbonate is 7.44%, emulsified bitumen powder is 4.34%, barite is 11.78%, limestone powder is 2.89%, carboxymethyl starch is 3.5%, sodium formiate is 9%, Industrial Salt is 5%, Repone K is 3%, Polyanionic Cellulose is 0.7%, all the other components are clear water; Described emulsified bitumen, detailed catalogue calcium carbonate, barite and limestone powder are generically and collectively referred to as shutoff material.Compound method is: successively the Polyanionic Cellulose of formula ratio, carboxymethyl starch, emulsified bitumen powder, detailed catalogue calcium carbonate, sodium formiate, Industrial Salt, Repone K, limestone powder, barite, sneak in clear water and stir.The granularity of described detailed catalogue calcium carbonate is that the granularity of 10 μ m, emulsified bitumen powder is that 5 μ m, barite granularity are that the granularity of 50 μ m, limestone powder is 100 μ m.
Embodiment 2
A kind of composite salt aqueous drilling fluid of shutoff cracks in coal seam, it is comprised of following component and mass percent thereof: detailed catalogue calcium carbonate is 6%, emulsified bitumen powder is 4%, barite is 10%, limestone powder is 2%, carboxymethyl starch is 3%, sodium formiate is 8%, Industrial Salt is 4%, Repone K is 2%, Polyanionic Cellulose is 0.6%, all the other components are clear water, and the granularity of described detailed catalogue calcium carbonate is that the granularity of 1 μ m, emulsified bitumen powder is that 0.1 μ m, barite granularity are that the granularity of 10 μ m, limestone powder is 20 μ m.The other the same as in Example 1.
Embodiment 3
A kind of composite salt aqueous drilling fluid of shutoff cracks in coal seam, it is comprised of following component and mass percent thereof: detailed catalogue calcium carbonate is 8%, emulsified bitumen powder is 6%, barite is 12%, limestone powder is 4%, carboxymethyl starch is 4%, sodium formiate is 10%, Industrial Salt is 6%, Repone K is 4%, Polyanionic Cellulose is 0.8%, all the other components are clear water, and the granularity of described detailed catalogue calcium carbonate is that the granularity of 20 μ m, emulsified bitumen powder is that 10 μ m, barite granularity are that the granularity of 100 μ m, limestone powder is 160 μ m.The other the same as in Example 1.
Embodiment 4
A composite salt aqueous drilling fluid for cracks in coal seam, it is comprised of following component and mass percent thereof: detailed catalogue calcium carbonate is 6-8%, emulsified bitumen powder is 4-6%, barite is 10-12%, limestone powder is 2-4%, carboxymethyl starch is that 3-4%, sodium formiate are that 8-10%, Industrial Salt are that 4-6%, Repone K are that 2-4%, Polyanionic Cellulose are that 0.6-0.8%, all the other components are clear water; Described emulsified bitumen, detailed catalogue calcium carbonate, barite and limestone powder are generically and collectively referred to as shutoff material, and shutoff total amount of material reaches 22-30%.The granularity of described detailed catalogue calcium carbonate is that the granularity of 1-20 μ m, emulsified bitumen powder is that 0.1-10 μ m, barite granularity are that the granularity of 10-100 μ m, limestone powder is 20-160 μ m.
The technique of this composite salt aqueous drilling fluid comprises following technical measures:
1) while controlling, creep into: divide/rice of 10-20 during brill, parameter: the pressure of the drill 1-2 ton, rotating speed 30r/min, discharge capacity 30L/S, suitably adjusts when in drilling process, parameter is according to brill among a small circle; Forbid that coal seam section is forbidden the operation of sliding in the fixed point circulation of coal seam rapid lapse of time, reduce deviational survey, in drilling process, keep a close eye on while boring, moment of torsion, have abnormal conditions, stop immediately creeping into, can not termination of pumping, above propose observation;
2) drilling fluid requires: 1. coal seam open before shutoff material barite in drilling fluid between hole deviation 45-55 degree, limestone powder, detailed catalogue calcium carbonate for and emulsified bitumen powder and other component carboxymethyl starch, sodium formiate, Industrial Salt for, Repone K, Polyanionic Cellulose must reach desired formula ratio, property of drilling fluid is reached: proportion 1.31-1.33 g/cm
3, viscosity 80-90s, dehydration≤2ml/30min, first losing time > 200s, shutoff total amount of material reaches 22-30%; 2. opening the anti-permeability time of coal seam mud cake can not be lower than 100s, anti-permeable dehydration < 2ml/30min, HTHP < 6ml.
3) before coal seam section pulls out of hole with sub-surface, fully circulating fluid more than at least 2 weeks, guarantees that well is clean, and during circulating fluid, drilling tool rotating speed consistent 30 r/min when normally creeping into coal seam, avoid the mechanical wounding to coal seam; Every 3 post pit shafts that pull out of hole must be filled mud.
4) playing coal seam section has and is hampered, on carry can not be over 15 tons, otherwise will after 2-3 post under drilling tool, avoid coal seam section turn on pump circulation more than at least 30 minutes, again carry seeing if there is on again and be hampered, if without being hampered, normally pull out of hole, if having, be hampered, must, by drilling tool again 2-3 post next time, avoid coal seam and carry out circular treatment mud; Under be drilled in coal seam and be hampered, turn on pump small displacement reaming, avoids large discharge capacity to wash away coal seam.
Embodiment 5
When collapse in quiet flat 17-25 coal seams, well lower curved section Benxi, the shutoff material dosage formula of 1:(employing prior art that sees the following form in mud system)
Property of drilling fluid table 2 when collapse in generation coal seam:
After well filling sidetracking, to boring in the process of coal seam, Benxi, adopt formula and the specification of the embodiment of the present invention 1, wherein, shutoff material dosage sees the following form 3:
After sidetracking, wear coal seam normal property of drilling fluid table 4:
Embodiment 6
When quiet flat 28-31 wells bore coal seam, Benxi, adopt formula and the specification of the embodiment of the present invention 3, wherein, in mud system, shutoff material dosage sees the following form 5:
Property of drilling fluid table 6:
Embodiment 7
When quiet south 64-10H well bores coal seam, Benxi, adopt formula and the specification of the embodiment of the present invention 2, wherein, in mud system, shutoff material dosage sees the following form 7:
Property of drilling fluid table 8:
Embodiment 8
When quiet south 65-13H3 well bores coal seam, Benxi, adopt composite salt aqueous drilling fluid of the present invention, in mud system, shutoff material dosage sees the following form 9:
Property of drilling fluid table 10:
Technical measures in above-described embodiment in the technique of using composite salt aqueous drilling fluid is with embodiment 4.
The parts that the present embodiment does not describe in detail and technique belong to well-known components and the conventional means of the industry, here not narration one by one.
Claims (3)
1. a composite salt aqueous drilling fluid for shutoff cracks in coal seam, is characterized in that: it is comprised of following component and mass percent thereof: calcium carbonate is 6-8%, emulsified bitumen powder is 4-6%, barite is 10-12%, limestone powder is 2-4%, carboxymethyl starch is that 3-4%, sodium formiate are that 8-10%, Industrial Salt are that 4-6%, Repone K are that 2-4%, Polyanionic Cellulose are that 0.6-0.8%, all the other components are clear water; Described emulsified bitumen, calcium carbonate, barite and limestone powder are generically and collectively referred to as shutoff material.
2. the composite salt aqueous drilling fluid of a kind of shutoff cracks in coal seam according to claim 1, is characterized in that: the granularity of described calcium carbonate is that the granularity of 1-20 μ m, emulsified bitumen powder is that 0.1-10 μ m, barite granularity are that the granularity of 10-100 μ m, limestone powder is 20-160 μ m.
3. the composite salt aqueous drilling fluid of a kind of shutoff cracks in coal seam according to claim 1, is characterized in that: use the technique of this drilling fluid to comprise following technical measures:
1) while controlling, creep into: divide/rice of 10-20 during brill, parameter: the pressure of the drill 1-2 ton, rotating speed 30r/min, discharge capacity 30L/S, suitably adjusts when in drilling process, parameter is according to brill among a small circle; Forbid that coal seam section is forbidden the operation of sliding in the fixed point circulation of coal seam rapid lapse of time, reduce deviational survey, in drilling process, keep a close eye on while boring, moment of torsion, have abnormal conditions, stop immediately creeping into, can not termination of pumping, above propose observation;
2) drilling fluid requires: 1. coal seam open before shutoff material barite in drilling fluid between hole deviation 45-55 degree, limestone powder, detailed catalogue calcium carbonate for and emulsified bitumen powder and other component carboxymethyl starch, sodium formiate, Industrial Salt for, Repone K, Polyanionic Cellulose must reach desired formula ratio, property of drilling fluid is reached: proportion 1.31-1.33 g/cm
3, viscosity 80-90s, dehydration≤2ml/30min, first losing time > 200s, shutoff total amount of material reaches 22-30%; 2. opening the anti-permeability time of coal seam mud cake can not be lower than 100s, anti-permeable dehydration < 2ml/30min, HTHP < 6ml;
3) before coal seam section pulls out of hole with sub-surface, fully circulating fluid more than at least 2 weeks, guarantees that well is clean, and during circulating fluid, drilling tool rotating speed consistent 30 r/min when normally creeping into coal seam, avoid the mechanical wounding to coal seam; Every 3 post pit shafts that pull out of hole must be filled mud;
4) playing coal seam section has and is hampered, on carry can not be over 15 tons, otherwise will after 2-3 post under drilling tool, avoid coal seam section turn on pump circulation more than at least 30 minutes, again carry seeing if there is on again and be hampered, if without being hampered, normally pull out of hole, if having, be hampered, must, by drilling tool again 2-3 post next time, avoid coal seam and carry out circular treatment mud; Under be drilled in coal seam and be hampered, turn on pump small displacement reaming, avoids large discharge capacity to wash away coal seam.
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| CN201310563176.3A CN103589406B (en) | 2013-11-14 | 2013-11-14 | A kind of complex salt aqueous drilling fluid blocking cracks in coal seam and use technique thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923622A (en) * | 2014-04-17 | 2014-07-16 | 中国石油大学(华东) | Multielement compound saltwater drilling fluid |
| CN104046338A (en) * | 2014-06-16 | 2014-09-17 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Anti-collapse and leakproof drilling fluid and construction method thereof |
| CN104497998A (en) * | 2015-01-09 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Salt-resistant and high-temperature-resistant organic salt emulsion drilling fluid and preparation method thereof |
| CN104762070A (en) * | 2015-03-31 | 2015-07-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Drilling liquid capable of passing through coal bed or carbonaceous mudstone for slant interval of horizontal well |
| CN106281272A (en) * | 2015-05-26 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of fracture-type reservoir bridge joint sealing agent and preparation method and application |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103923622A (en) * | 2014-04-17 | 2014-07-16 | 中国石油大学(华东) | Multielement compound saltwater drilling fluid |
| CN104046338A (en) * | 2014-06-16 | 2014-09-17 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Anti-collapse and leakproof drilling fluid and construction method thereof |
| CN104046338B (en) * | 2014-06-16 | 2017-02-01 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Anti-collapse and leakproof drilling fluid and construction method thereof |
| CN104497998A (en) * | 2015-01-09 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Salt-resistant and high-temperature-resistant organic salt emulsion drilling fluid and preparation method thereof |
| CN104497998B (en) * | 2015-01-09 | 2017-10-27 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | The organic salt emulsion drilling fluid and compound method of a kind of salt-resisting high-temperature-resisting |
| CN104762070A (en) * | 2015-03-31 | 2015-07-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Drilling liquid capable of passing through coal bed or carbonaceous mudstone for slant interval of horizontal well |
| CN106281272A (en) * | 2015-05-26 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of fracture-type reservoir bridge joint sealing agent and preparation method and application |
| CN106281272B (en) * | 2015-05-26 | 2019-02-22 | 中国石油化工股份有限公司 | A kind of fracture-type reservoir bridge joint sealing agent and the preparation method and application thereof |
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| CN103589406B (en) | 2016-08-17 |
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