Variable penetration depth cluster perforating gun suitable for horizontal well staged fracturing and application method thereof

A technology of staged fracturing and application method, applied in the field of horizontal well fracturing, to achieve the effect of improving fracturing development effect, clear principle, and increasing volume

Active Publication Date: 2021-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, there are still many uncertainties in promoting the uniform extension of multi-cluster fractures by the conventional temporary plugging technology

Method used

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  • Variable penetration depth cluster perforating gun suitable for horizontal well staged fracturing and application method thereof
  • Variable penetration depth cluster perforating gun suitable for horizontal well staged fracturing and application method thereof
  • Variable penetration depth cluster perforating gun suitable for horizontal well staged fracturing and application method thereof

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specific Embodiment

[0052] The invention is applied in a certain normal-pressure shale gas well in southeastern Sichuan. The fracturing design of this well adopts the idea of ​​"few sections and multiple clusters". Each fracturing section adopts 5-7 clusters of perforation. According to the previous practice of multi-cluster fracturing, it is predicted that the fractures in this well will experience non-uniform expansion of fractures. Therefore, a variable penetration depth cluster perforation method was designed. Using 89 guns with 90 bullets of different types, firstly, through experiments, the charge amount corresponding to the minimum penetration depth required by the fracturing design and the charge amount required to increase the unit penetration depth were determined. According to the above experimental results, reservoir rock mechanical parameters and ground stress parameters, the charge ratio of 5 clusters is designed to be 1:1.6:2.1:2.6:3.2; the charge ratio of 6 clusters is 1:1.6:2.1:2...

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Abstract

The invention provides a variable penetration depth cluster perforating gun suitable for horizontal well staged fracturing and an application method thereof. The variable penetration depth cluster perforating gun comprises a gun head, a gun tail, a gun body, a cartridge holder and perforating bullets, the gun head and the gun tail are correspondingly connected to the two ends of the gun body, the cartridge holder is arranged in the gun body, and the cartridge holder is used for installing the multiple perforating bullets; and the perforating depths of the perforating bullets are gradually reduced in the direction from the gun tail to the gun head. According to the invention, the types of the perforating bullets contained in all clusters of a section of the perforating gun are different, the penetrating depths of the perforating bullets are gradually decreased in the direction from a target point b to a target point a, the opening pressure of perforation cracks of all the clusters is gradually decreased, the penetrating depths of all the clusters of perforations in the section can be different, uniform crack initiation and extension of all the clusters of perforations in the section are facilitated, and the staged fracturing transformation volume of the horizontal well is greatly increased. In addition, the arrangement of the perforating bullets in each cluster is different from the traditional arrangement according to phases, the perforating bullets are arranged according to plane perforation, every two or three perforating bullet sections are shot in the same plane, and formation and extension of the cracks in the clusters are facilitated.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing, in particular to a variable penetration depth cluster perforating gun suitable for staged fracturing of horizontal wells and an application method thereof. Background technique [0002] At present, the staged multi-cluster fracturing technology of horizontal wells has been widely used in low-permeability and tight oil and gas reservoirs of different lithologies (sandstone, carbonate rock, shale and coal seam, etc.), and has achieved significant production stimulation effects, realizing Economical and effective development of the above oil and gas reservoirs. However, there are serious problems at the same time. With the continuous increase of the number of perforation clusters, the number of clusters in the section gradually increased from 2-3 clusters in the past to 4-6 clusters or even 6-9 clusters. It is also difficult to ensure that all perforation clusters can open fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/116E21B43/119E21B43/26
CPCE21B43/116E21B43/119E21B43/26
Inventor 蒋廷学李洪春左罗李奎为贾长贵周珺周林波刘斌彦
Owner CHINA PETROLEUM & CHEM CORP
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