CN105649597A - Bridge plug combined staged fracturing stimulation method for extra-thick coal bed in vertical coal bed methane well - Google Patents
Bridge plug combined staged fracturing stimulation method for extra-thick coal bed in vertical coal bed methane well Download PDFInfo
- Publication number
- CN105649597A CN105649597A CN201610154843.6A CN201610154843A CN105649597A CN 105649597 A CN105649597 A CN 105649597A CN 201610154843 A CN201610154843 A CN 201610154843A CN 105649597 A CN105649597 A CN 105649597A
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- China
- Prior art keywords
- fracturing
- coal bed
- perforation
- plug
- bridging plug
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Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention discloses a bridge plug combined staged fracturing stimulation method for an extra-thick coal bed in a vertical coal bed methane well. During fracturing modification of the extra-thick coal bed in the vertical coal bed methane well, the extra-thick coal bed is divided into a plurality of sections, and sectionalized perforation and bridge plug setting are performed for fracturing stimulation modification. The method comprises the steps of lowering a bridge and perforation combined tool string such as a positioner, a perforation gun, a quick drilling type composite bridge plug and the like to a design position, performing bridge plug setting and ignition perforation of the perforation gun by using an electronic multilevel control system, performing setting and perforation on the first section of the coal bed, pulling out the bridge and perforation combined tool string, performing fracturing stimulation modification on the first section of the coal bed through casing injection, and then performing blow-off in time; and after the construction of the first section is ended, lowering the bridge and perforation combined tool string again, performing setting and perforation on the second section, performing fracturing on the second section through casing injection, and performing blow-off; according to the process, performing fracturing stimulation modification on the third and fourth sections and the like; after the construction of all the sections is ended, performing plug drilling operation; and finally performing complementary perforation operation on the non-perforated sections.
Description
Background technology
The present invention relates to a kind of CBM exploration and development technical field, make staged fracturing method for increasing particularly to a kind of coal bed gas peupendicular hole super high seam bridging plug connection.
Background technology
Special thick coal seam reservoirs is the important component part of Coalbed Methane In China exploitation, and CHINESE COAL reservoir major part has the advantages that low pressure and low permeability is saturating, is required for carrying out fracturing yield increasing transformation. When carrying out the transformation of coal bed gas peupendicular hole spy's thickness coal seam reservoirs fracturing yield increasing, owing to coal seam thickness is relatively big, only carrying out a perforating and fracturing operation, man-made fracture small scale, fracture support effect is poor, not easily reaches the purpose of storey increase design. It is thus desirable to special thick coal seam reservoirs is adopted staged fracturing storey increase design operation, to reach desirable storey increase design effect.
Summary of the invention
Present invention solves the technical problem that being to provide a kind of coal bed gas peupendicular hole super high seam bridging plug connection makes staged fracturing method for increasing. Special thick coal seam reservoirs can be carried out multistage fracturing yield increasing transformation by this method, thoroughly changes the problem that the special thick coal seam reservoirs fracturing yield increasing correctional effect of tradition is poor. This method is desirable for coal bed gas peupendicular hole super high seam fracturing yield increasing correctional effect, and man-made fracture seam net is complicated, fracture support effect is better; Expense is low, and efficiency is high, short construction period, and a preparation of construction can continuously perform the transformation of multistage fracturing yield increasing.
The technical solution used in the present invention is: staged fracturing method for increasing made by a kind of coal bed gas peupendicular hole super high seam bridging plug connection, comprises the following steps:
A () staged fracturing designs: write the design of super high seam staged fracturing according to geology, engineering data, specify dividing potential drop hop count and set, perforating site, the main FRACTURING DESIGN of sleeve pipe;
B () bridging plug sets, perforation: for the coal bed gas peupendicular hole of �� 139.7mm sleeve pipe, adopts gun shaped/bullet type perforating gun, 16 hole counts/rice, �� 110mm bridging plug, maximum extension ratio 1.2, operating pressure 70MPa, electronics multilevel control system realizes bridging plug and sets and perforating gun igniting perforation;
C () main pressure break: according to main FRACTURING DESIGN, carries out the main fracturing yield increasing transformation of coal seam section by sleeve pipe;
D () open flow: carry out open flow operation after main fracturing reform in time, reduces to zero to well head pressure and there is no fracturing fluid and return out, complete the fracturing yield increasing transformation operation of first paragraph;
D () again enters down bridge, penetrates tool string in design attitude, second segment is set, perforated casing pressure break open flow, completes second segment volume increase fracturing reform;
(e) with this step, to third and fourth ... section carries out fracturing yield increasing transformation;
F () bores plug: after all staged fracturing storey increase design terminates, and carries out boring plug operation, and bridging plug chip is washed out well head;
(g) dead chick: brill plug operation adopts 102/127(gun shaped/bullet type after completing) perforating gun, 16 hole counts/ meter Jin Hang dead chick operation, non-perforated interval is carried out perforating job, passage between encryption coal seam reservoirs and sleeve pipe.
Further, as preferably, adopt cable transmission perforation, set bridging plug casing fracturing open flow and bore plug dead chick technology special thick coal seam reservoirs is carried out staged fracturing storey increase design.
Beneficial effects of the present invention:
Staged fracturing method for increasing made by the coal bed gas peupendicular hole super high seam bridging plug connection of the present invention, and staged fracturing designs, and specifies various fracturing parameter; First paragraph pressure break, cable transmission perforation, sets bridging plug casing fracturing open flow; Second segment pressure break, again enters bridge down, penetrates tool string, carries out cable transmission perforation, sets bridging plug casing fracturing open flow; According to this step pressure break third and fourth ... section; Bore plug operation, and bridging plug chip is washed out well head; Dead chick operation, the passage between encryption coal seam reservoirs and sleeve pipe.
Detailed description of the invention
The invention provides a kind of coal bed gas peupendicular hole super high seam bridging plug connection and make staged fracturing method for increasing, comprise the following steps:
A () staged fracturing designs: write the design of super high seam staged fracturing according to geology, engineering data, specify dividing potential drop hop count and set, perforating site, the main FRACTURING DESIGN of sleeve pipe;
B () bridging plug sets, perforation: for the coal bed gas peupendicular hole of �� 139.7mm sleeve pipe, adopts gun shaped/bullet type perforating gun, 16 hole counts/rice, �� 110mm bridging plug, maximum extension ratio 1.2, operating pressure 70MPa, electronics multilevel control system realizes bridging plug and sets and perforating gun igniting perforation;
C () main pressure break: according to main FRACTURING DESIGN, carries out the main fracturing yield increasing transformation of coal seam section by sleeve pipe;
D () open flow: carry out open flow operation after main fracturing reform in time, reduces to zero to well head pressure and there is no fracturing fluid and return out, complete the fracturing yield increasing transformation operation of first paragraph;
D () again enters down bridge, penetrates tool string in design attitude, second segment is set, perforated casing pressure break open flow, completes second segment volume increase fracturing reform;
(e) with this step, to third and fourth ... section carries out fracturing yield increasing transformation;
F () bores plug: after all staged fracturing storey increase design terminates, and carries out boring plug operation, and bridging plug chip is washed out well head;
(g) dead chick: brill plug operation adopts 102/127(gun shaped/bullet type after completing) perforating gun, 16 hole counts/ meter Jin Hang dead chick operation, non-perforated interval is carried out perforating job, passage between encryption coal seam reservoirs and sleeve pipe.
In the present embodiment, adopt cable transmission perforation, set bridging plug casing fracturing open flow and bore plug dead chick technology special thick coal seam reservoirs is carried out staged fracturing storey increase design.
Staged fracturing method for increasing made by the coal bed gas peupendicular hole super high seam bridging plug connection of the present invention, and staged fracturing designs, and specifies various fracturing parameter;First paragraph pressure break, cable transmission perforation, sets bridging plug casing fracturing open flow; Second segment pressure break, again enters bridge down, penetrates tool string, carries out cable transmission perforation, sets bridging plug casing fracturing open flow; According to this step pressure break third and fourth ... section; Bore plug operation, and bridging plug chip is washed out well head; Dead chick operation, the passage between encryption coal seam reservoirs and sleeve pipe.
Claims (2)
1. a staged fracturing method for increasing made by coal bed gas peupendicular hole super high seam bridging plug connection, comprises the following steps:
A () staged fracturing designs: write the design of super high seam staged fracturing according to geology, engineering data, specify dividing potential drop hop count and set, perforating site, the main FRACTURING DESIGN of sleeve pipe;
B () bridging plug sets, perforation: for the coal bed gas peupendicular hole of �� 139.7mm sleeve pipe, adopts gun shaped/bullet type perforating gun, 16 hole counts/rice, �� 110mm bridging plug, maximum extension ratio 1.2, operating pressure 70MPa, electronics multilevel control system realizes bridging plug and sets and perforating gun igniting perforation;
C () main pressure break: according to main FRACTURING DESIGN, carries out the main fracturing yield increasing transformation of coal seam section by sleeve pipe;
D () open flow: carry out open flow operation after main fracturing reform in time, reduces to zero to well head pressure and there is no fracturing fluid and return out, complete the fracturing yield increasing transformation operation of first paragraph;
D () again enters down bridge, penetrates tool string in design attitude, second segment is set, perforated casing pressure break open flow, completes second segment volume increase fracturing reform;
(e) with this step, to third and fourth ... section carries out fracturing yield increasing transformation;
F () bores plug: after all staged fracturing storey increase design terminates, and carries out boring plug operation, and bridging plug chip is washed out well head;
(g) dead chick: brill plug operation adopts 102/127(gun shaped/bullet type after completing) perforating gun, 16 hole counts/ meter Jin Hang dead chick operation, non-perforated interval is carried out perforating job, passage between encryption coal seam reservoirs and sleeve pipe.
2. staged fracturing method for increasing made by a kind of coal bed gas peupendicular hole super high seam bridging plug connection according to claim 1, it is characterised in that: adopt cable transmission perforation, set bridging plug casing fracturing open flow and bore plug dead chick technology special thick coal seam reservoirs is carried out staged fracturing storey increase design.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154843.6A CN105649597A (en) | 2016-03-18 | 2016-03-18 | Bridge plug combined staged fracturing stimulation method for extra-thick coal bed in vertical coal bed methane well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154843.6A CN105649597A (en) | 2016-03-18 | 2016-03-18 | Bridge plug combined staged fracturing stimulation method for extra-thick coal bed in vertical coal bed methane well |
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| CN105649597A true CN105649597A (en) | 2016-06-08 |
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| CN201610154843.6A Pending CN105649597A (en) | 2016-03-18 | 2016-03-18 | Bridge plug combined staged fracturing stimulation method for extra-thick coal bed in vertical coal bed methane well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223920A (en) * | 2016-08-19 | 2016-12-14 | 重庆市能源投资集团科技有限责任公司 | A kind of multiple seam sliding sleeve isolation multiple fracturing device and method |
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| US20050247447A1 (en) * | 2004-05-10 | 2005-11-10 | Spring Roger L | Angled perforating device for well completions |
| CN102704905A (en) * | 2012-06-11 | 2012-10-03 | 煤炭科学研究总院沈阳研究院 | Segmental hydraulic fracturing coal seam pressure releasing device and method |
| CN103967472A (en) * | 2014-05-26 | 2014-08-06 | 中煤科工集团西安研究院有限公司 | Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing |
| CN104453803A (en) * | 2014-09-30 | 2015-03-25 | 贵州省煤层气页岩气工程技术研究中心 | Combined coal-formed gas reservoir multilayer commingling production method and structure |
| CN105201483A (en) * | 2015-09-22 | 2015-12-30 | 中北大学 | Environment-friendly downhole stratum fracturing method |
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2016
- 2016-03-18 CN CN201610154843.6A patent/CN105649597A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050247447A1 (en) * | 2004-05-10 | 2005-11-10 | Spring Roger L | Angled perforating device for well completions |
| CN102704905A (en) * | 2012-06-11 | 2012-10-03 | 煤炭科学研究总院沈阳研究院 | Segmental hydraulic fracturing coal seam pressure releasing device and method |
| CN103967472A (en) * | 2014-05-26 | 2014-08-06 | 中煤科工集团西安研究院有限公司 | Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing |
| CN104453803A (en) * | 2014-09-30 | 2015-03-25 | 贵州省煤层气页岩气工程技术研究中心 | Combined coal-formed gas reservoir multilayer commingling production method and structure |
| CN105201483A (en) * | 2015-09-22 | 2015-12-30 | 中北大学 | Environment-friendly downhole stratum fracturing method |
Non-Patent Citations (1)
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| 《钻井手册(甲方)》编委会: "《钻井手册 甲方 下》", 30 November 1990, 石油工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223920A (en) * | 2016-08-19 | 2016-12-14 | 重庆市能源投资集团科技有限责任公司 | A kind of multiple seam sliding sleeve isolation multiple fracturing device and method |
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Application publication date: 20160608 |