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Oil and gas reservoir fracturing method

A oil and gas reservoir and fracturing technology, which is applied in oil and gas reservoir fracturing to improve the field of low permeability and ultra-low permeability oil and gas reservoir fracturing. Reduction of proppant support area, limitations, etc., to achieve the effects of increasing reservoir production, reducing post-pressure production, and increasing filtration damage

Inactive Publication Date: 2019-02-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] However, due to the difficulty and technical complexity of volume fracturing, it is extremely difficult to truly increase the swept volume of oil and gas.
Therefore, for low-permeability and extra-low-permeability oil and gas reservoirs, the fracturing effects of vertical wells or horizontal wells are sometimes unsatisfactory, and there are mainly the following technical problems: (1) It is difficult to control the fracture height of large-scale fracturing in vertical wells, The support area of ​​the proppant within the effective thickness is greatly reduced; (2) The coverage of staged fracturing in horizontal wells is still limited, basically limited to the length of the horizontal section and the entire length of the transverse fracture

Method used

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with specific embodiments, but it should be understood that the scope of the present invention is not limited to the exemplary embodiments.

[0040] Using the fracturing method provided by the present invention, the fracturing scheme design and on-site pilot test are carried out on the target reservoir in the Sichuan Basin, including the following processes.

[0041] (1) The lithology of the target interval is shale, with well-developed natural fractures. The fracturing interval of the target layer is 2515.0-2595.5m, the layer thickness is 80.5m, the average Young's modulus of the reservoir is 26.8GPa, the average Poisson's ratio is 0.22, and the temperature is 108°C. Combining well logging data, mud logging data, and core experiment data, the in-situ stress parameters, rock and mineral characteristics, and natural fracture development of the well were analyzed and obtained. assessment to identify geo...

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Abstract

The invention provides an oil and gas reservoir fracturing method. The method comprises following steps: forming a well group in the target reservoir, the well group comprising a first horizontal welland a second horizontal well, and a vertical well communicating the toes of the first horizontal well and the second horizontal well; perforating and performing fracturing in the horizontal sectionsof the first horizontal well and the second horizontal well, respectively; perforating in the vertical well and then returning from the wellbore of the vertical well. The method combines the advantages of vertical wells and horizontal wells, maximizes the full communication and interaction of horizontal wells and fractures with oil and gas reservoirs, and realizes a wide range of drainage and gasdrainage volume, thereby improving the reservoir yield increase effect.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for fracturing oil and gas reservoirs, in particular to a method for improving the fracturing of oil and gas reservoirs with low permeability and ultra-low permeability. Background technique [0002] For low-permeability and ultra-low-permeability reservoirs (referred to as low-permeability and ultra-low-permeability reservoirs), it is very important to maximize the swept volume. At present, the commonly used technologies to increase the swept volume of oil and gas mainly include large-scale fracturing technology for vertical wells and staged fracturing technology for horizontal wells. With the success and commercial opening of shale gas fracturing technology, volume fracturing technology has also gradually emerged. Using volume fracturing technology, on the basis of large-scale fracturing of vertical wells and staged fracturing of horizontal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 蒋廷学吴峙颖王宝峰吴春方刘建坤刘红磊周林波周珺
Owner CHINA PETROLEUM & CHEM CORP
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