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A staged fracturing method for horizontal wells

A technology for staged fracturing and horizontal wells, which is applied in earthwork drilling, wellbore/well components, production fluids, etc. It can solve the problem that the fracturing fluid is not effectively separated, all sections are not fully reformed, and the effect of fracturing is affected. To achieve the effect of reducing the poor effect of fracturing construction, improving the success rate of fracturing construction, and achieving great economic benefits

Active Publication Date: 2021-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

If staged fracturing is still required at this time, the possible consequence is that the fracturing fluid in different stages is not effectively separated, and all the fracturing fluid may enter a few fracturing stages, and in the end, all stages cannot be fully stimulated. Thus affecting the effect of fracturing construction

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  • A staged fracturing method for horizontal wells
  • A staged fracturing method for horizontal wells
  • A staged fracturing method for horizontal wells

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing.

[0023] The invention proposes a staged fracturing method for horizontal wells. In the method, firstly, the wellbore of the horizontal well is evaluated for cementing quality. That is, comprehensively analyze the cementing quality profile of the horizontal section. For example, the evaluation of the cementing quality of horizontal wells can be carried out using the standard numbered SY / T 6592-2016. Of course, other criteria can also be used to evaluate the cementing quality of horizontal wells. Moreover, due to the randomness of geotechnical parameters, the evaluation results of cementing quality will be slightly different according to specific engineering wells. The resulting cement quality can rely on sonic logs to interpret the results.

[0024] Then, according to the above cementing quality evaluation results, the setting position of the bridge plug is selected, wher...

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Abstract

The invention proposes a staged fracturing method for horizontal wells, which includes step 1, evaluating the cementing quality of the wellbore of the horizontal well; and step 2, selecting a bridge plug setting position according to the result of the cementing quality evaluation. This method can improve the effect of staged fracturing in the case of poor cementing quality.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing engineering, in particular to a staged fracturing method for horizontal wells. Background technique [0002] At present, the number of deep shale gas drilling, completion and fracturing wells is increasing. However, due to the complexity of the geological structure, various high-angle natural fractures and horizontal bedding fractures may coexist. As a result, the mud loss during drilling increases, and even loss of return is likely to occur. In this case, the cement slurry is also easy to migrate along the leakage channel of the drilling mud, which makes the distribution of the cement slurry between the outer wall of the casing and the inner wall of the open hole wellbore uneven. The final cementing quality may not meet the integrity requirements of the cement sheath for large-scale staged fracturing. If staged fracturing is still required at this time, the possible conseque...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/27
CPCE21B43/26
Inventor 蒋廷学苏瑗卞晓冰卫然王海涛侯磊李双明左罗
Owner CHINA PETROLEUM & CHEM CORP