Shale gas horizontal well casing-fixation-in-casing refracturing method

A technology for refracturing and horizontal wells, which is applied in the field of shale gas horizontal well casing casing refracturing, which can solve problems such as poor stimulation effects, achieve strong applicability, ensure safety and reliability, and improve liquid efficiency Effect

Active Publication Date: 2021-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for repeated fracturing of solid casing in shale gas horizontal well casing, so as to solve the technical problem of poor stimulation effect existing in the existing process of repeated fracturing in long horizontal section shale gas wells

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Embodiment Construction

[0032] The following is further described in detail through specific implementation methods:

[0033] The embodiment is basically as attached figure 1 with attached figure 2 Shown: a shale gas horizontal well casing casing refracturing method, including:

[0034] Step 1. Combined with the gas production profile test to analyze the remaining potential after refracturing:

[0035] 1) The gas production profile test was carried out under the two production systems of 60,000 m3 / day and 120,000 m3 / day, and the gas production contribution percentage of each cluster in the initial fracturing in the original wellbore was obtained. To judge the consistency of gas production contribution under the two production systems, the gas production contribution percentage of each fracturing cluster closest to the average value was selected as the reference data.

[0036] 2) Combined with the geological characteristics of the gas reservoir (such as gas content, physical properties, etc.), est...

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Abstract

The invention relates to the technical field of shale gas repeated development, and particularly discloses a shale gas horizontal well casing-fixation-in-casing refracturing method. The method comprises the following steps of 1, performing residual potential analysis, and carrying out a gas production profile test to obtain the gas production contribution percentage of each cluster of primary fracturing; 2, performing well cementation of an original shaft, and installing a small casing pipe in the original shaft to form a new shaft; 3, performing fracturing design, analyzing the recovery degree of each section and each cluster in the original shaft according to the gas production contribution percentage, clearly determining the shale gas residual potential distribution condition in combination with the transformation effect of the original shaft during primary fracturing, determining the perforation position of refracturing according to the residual potential distribution condition, and performing displacement optimization and pump injection program optimization design; and 4, performing fracturing construction. The shale gas horizontal well casing-fixation-in-casing refracturing method solves the technical problems of high construction difficulty and low adaptability in a long horizontal section shale gas well in an existing technology.

Description

technical field [0001] The invention relates to the technical field of repeated development of shale gas, and specifically discloses a method for repeated fracturing of solid casings in horizontal well casings of shale gas. Background technique [0002] As an unconventional energy source, shale gas has the characteristics of low porosity, low permeability, and no natural production capacity. It needs to be produced through large-scale hydraulic fracturing to form an artificial fracture network to provide seepage channels. After the initial transformation, the rate of production decline is fast and the stable production period is short. question. As an economical and effective stimulation technology, refracturing can greatly improve the economic benefits of gas fields. Domestic shale gas well refracturing technology is still in the initial stage of exploration. [0003] At present, shale gas well refracturing technology is divided into temporary plugging diversion refracturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/10E21B43/11
CPCE21B43/26E21B43/10E21B43/11
Inventor 胡德高刘尧文李远照沈金才明月张驰豆瑞杰李奎东张旭方栋梁韦琦吴魏肖佳林周彤李婷尹星鑫刘俊苏慕博文
Owner CHINA PETROLEUM & CHEM CORP
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