CN105201478A - Oil and gas well fracture network system fracturing technology - Google Patents
Oil and gas well fracture network system fracturing technology Download PDFInfo
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- CN105201478A CN105201478A CN201510639355.XA CN201510639355A CN105201478A CN 105201478 A CN105201478 A CN 105201478A CN 201510639355 A CN201510639355 A CN 201510639355A CN 105201478 A CN105201478 A CN 105201478A
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Abstract
The invention relates to an oil and gas well fracture network system fracturing technology. The method comprises the following steps that perforation is carried out on an oil pipe; packers are utilized for blocking the upper end and the lower end of a perforated hole; fracturing liquid is injected through the perforated hole to enable a stratum to form a main fracture; a temporary plugging agent is used for plugging the main fracture; pressure of the fracturing liquid is increased to 5-10 MPa, the fracturing liquid is injected again by means of the perforated hole to enable the stratum to form a larger number of secondary fractures around the main fracture. The fracture network system fracturing technology is provided for increasing the yield of an oil and gas field, natural fractures around a shaft and the artificial fractures can be distributed in a staggered mode to form an artificial fracture three-dimensional network, the swept volume of the fractured fractures in a reservoir can be maximized, and the well seepage size after fracturing is increased by folds, so that the purpose of increasing the yield and the injection amount is achieved.
Description
Technical field
The invention belongs to oil field technology field, relate to a kind of Oil/gas Well seam net system fracturing technology.
Background technology
At present in oil gas field well stimulation, hydraulic fracturing process is effectively a kind of transformation means, this technique has the features such as instant effect, amount of increase in production be large, more traditional hydraulic fracturing process is generally the layer and section pressure break of small displacement on a small scale, fluidity, proppant variety protection are single, the man-made fracture formed after pressure break is a single main seam, intrinsic fracture is opened and is extended restricted, seepage area is limited, Fracture System is for oil gas ability, if old well refracturing, traditional fracturing technology effect of increasing production is poor, and period of validity is short.Therefore, design one is needed can to stitch net system fracturing technology by huge discharge on a large scale.
Summary of the invention
The object of this invention is to provide a kind of Oil/gas Well seam net system fracturing technology, the man-made fracture formed after overcoming current fracturing is a single main seam, and seepage area is limited, and Fracture System is for the problem of oil gas ability.
The present invention is achieved through the following technical solutions: a kind of Oil/gas Well seam net system fracturing technology, and the method comprises the following steps:
(1) perforation on oil pipe;
(2) two ends up and down of packer shutoff perforation are utilized;
(3) fracturing fluid is injected by perforation, makes stratum form major fracture;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture.
Described fracturing fluid and diverting agent are the known technology of those skilled in the art.
The present invention is in low-porosity, under the particular reservoir conditions such as a low extra-low permeability, utilize the relation of reservoir two horizontal principal stress differences and fracture extension net pressure, once realize the difference that fracture extension net pressure is greater than two horizontal principal stress, branch's seam will be produced, after branch's seam links up intrinsic fracture, continue to extend along intrinsic fracture, form preliminary seam net system, branch's seam may be returned to again original fracture orientation after extending certain length apart from main seam, or open some to stitch with the main branch being seamed into certain angle, finally can be formed with major fracture is crisscross " netted seam " system of trunk.Multi items liquid is adopted to coordinate segmentation plug to inject, coordinate turnaround fracture technology, after intrinsic fracture is formed, drop into diverting agent by intrinsic fracture temporary occlusion, strengthen operational discharge capacity and improve net pressure in seam, on the basis of intrinsic fracture and man-made fracture, formed and complicatedly stitch net system, finally utilize and efficiently take sand fracturing fluid crack is all filled, reach seam net system and effectively support comprehensively.
Adopt the good effect of technique scheme: the present invention provides a kind of fracturing technology stitching net system for oil gas field increases production, intrinsic fracture and man-made fracture around pit shaft can be realized to interlock branch, form man-made fracture cubic network, realize the maximization of fracturing fracture swept volume in reservoir, post-fracturing well seepage flow volume is multiplied, thus reaches the object of increasing yield and injection.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention.
In figure, 1 oil pipe, 2 packers, 3 perforations, 4 major fractures, 5 secondary fractures.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme of the present invention is described further, but should not be construed as limitation of the present invention:
Embodiment 1
Oil/gas Well seam net system fracturing technology of the present invention is tested on oil field, well depth 1762.39 meters, and during use, method comprises the following steps:
(1) perforation on oil pipe 1;
(2) two ends up and down of packer 2 shutoff perforation 3 are utilized;
(3) fracturing fluid, pressure 36MPa, is injected by perforation, makes stratum form major fracture 4;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture 5.
Embodiment 2
Oil/gas Well seam net system fracturing technology of the present invention is tested on oil field, well depth 2301.9 meters, and during use, method comprises the following steps:
(1) perforation on sleeve pipe 1;
(2) two ends up and down of packer 2 shutoff perforation 3 are utilized;
(3) fracturing fluid, pressure 44.6MPa, is injected by perforation, makes stratum form major fracture 4;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture 5.
Embodiment 3
Oil/gas Well seam net system fracturing technology of the present invention is tested on oil field, well depth 3262.65 meters, and during use, method comprises the following steps:
(1) perforation on sleeve pipe 1;
(2) two ends up and down of packer 2 shutoff perforation 3 are utilized;
(3) fracturing fluid, pressure 55.2MPa, is injected by perforation, makes stratum form major fracture 4;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture 5.
Embodiment 4
Oil/gas Well seam net system fracturing technology of the present invention is tested on oil field, well depth 1391.2 meters, and during use, method comprises the following steps:
(1) perforation on sleeve pipe 1;
(2) two ends up and down of packer 2 shutoff perforation 3 are utilized;
(3) fracturing fluid, pressure 29MPa, is injected by perforation, makes stratum form major fracture 4;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture 5.
Comparative example
The Oil/gas Well seam net system fracturing technology of embodiment 1-4, contrast with conventional oil well, result is as following table:
The present invention provides a kind of fracturing technology stitching net system for oil gas field increases production, intrinsic fracture and man-made fracture around pit shaft can be realized to interlock branch, form man-made fracture cubic network, realize the maximization of fracturing fracture swept volume in reservoir, post-fracturing well seepage flow volume is multiplied, thus reaches the object of increasing yield and injection.
Claims (1)
1. an Oil/gas Well seam net system fracturing technology, is characterized in that: the method comprises the following steps:
(1) perforation on oil pipe;
(2) two ends up and down of packer shutoff perforation are utilized;
(3) fracturing fluid is injected by perforation, makes stratum form major fracture;
(4) major fracture is blocked with diverting agent;
(5) improve of the fracturing fluid pressure 5-10MPa, again injected by perforation, make stratum around major fracture, form a large amount of secondary fracture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510639355.XA CN105201478A (en) | 2015-09-30 | 2015-09-30 | Oil and gas well fracture network system fracturing technology |
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| CN201510639355.XA CN105201478A (en) | 2015-09-30 | 2015-09-30 | Oil and gas well fracture network system fracturing technology |
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| CN105201478A true CN105201478A (en) | 2015-12-30 |
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Cited By (5)
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| CN106761652A (en) * | 2016-12-26 | 2017-05-31 | 大庆井泰石油工程技术股份有限公司 | Orientation windowing horizontal drilling, coring and matching method |
| CN107956463A (en) * | 2016-10-18 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of ultra-low permeability reservoir straight well omnibearing stereo fracturing process |
| CN108625838A (en) * | 2017-03-16 | 2018-10-09 | 中国石油化工股份有限公司 | Formation breakdown method |
| CN109931045A (en) * | 2017-12-18 | 2019-06-25 | 中国石油化工股份有限公司 | A kind of self-supporting acid fracturing method of double slit system |
| CN112324412A (en) * | 2020-11-02 | 2021-02-05 | 中国石油化工股份有限公司 | Method for forming complex seam net through volume fracturing |
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| CN104594870A (en) * | 2014-12-22 | 2015-05-06 | 中国石油天然气股份有限公司 | Fracturing stimulation method |
| CN104727800A (en) * | 2015-01-22 | 2015-06-24 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Temporary blocking turnaround fracturing method based on surface modified polyvinyl alcohol fibers |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956463A (en) * | 2016-10-18 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of ultra-low permeability reservoir straight well omnibearing stereo fracturing process |
| CN107956463B (en) * | 2016-10-18 | 2020-07-24 | 中国石油化工股份有限公司 | Ultra-low permeability reservoir vertical well omnibearing three-dimensional fracturing method |
| CN106761652A (en) * | 2016-12-26 | 2017-05-31 | 大庆井泰石油工程技术股份有限公司 | Orientation windowing horizontal drilling, coring and matching method |
| CN108625838A (en) * | 2017-03-16 | 2018-10-09 | 中国石油化工股份有限公司 | Formation breakdown method |
| CN108625838B (en) * | 2017-03-16 | 2020-07-03 | 中国石油化工股份有限公司 | Formation fracturing method |
| CN109931045A (en) * | 2017-12-18 | 2019-06-25 | 中国石油化工股份有限公司 | A kind of self-supporting acid fracturing method of double slit system |
| CN109931045B (en) * | 2017-12-18 | 2021-08-31 | 中国石油化工股份有限公司 | Self-supporting acid fracturing method of double-seam system |
| CN112324412A (en) * | 2020-11-02 | 2021-02-05 | 中国石油化工股份有限公司 | Method for forming complex seam net through volume fracturing |
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