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Optimized design method for positions of horizontal well segmented multi-cluster fracturing perforation clusters

A technology for optimal design and perforation clusters, applied in calculation, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2017-07-07
来安县永阳知识产权运营有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, no one has proposed an optimal design method for perforation clusters that meets the multi-cluster fracturing conditions of horizontal wells and aims at the end-to-end connection of the fracturing areas in the horizontal well section.

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  • Optimized design method for positions of horizontal well segmented multi-cluster fracturing perforation clusters
  • Optimized design method for positions of horizontal well segmented multi-cluster fracturing perforation clusters
  • Optimized design method for positions of horizontal well segmented multi-cluster fracturing perforation clusters

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Embodiment Construction

[0058] The present invention is described further below:

[0059] This optimal design method for multi-cluster fracturing perforation cluster positions in horizontal wells:

[0060] Step 1. Determine the position of each perforation cluster in the first fracturing stage according to the wellbore characteristics and development requirements.

[0061] Step 2, calculating the induced stress generated by the fracture at the last perforation cluster of the first fracturing stage.

[0062]

[0063] In the formula: are the induced stresses generated by fractures at the last perforation cluster in the first fracturing stage in the direction of the minimum horizontal in-situ stress and the maximum horizontal in-situ stress, MPa; p net is the net pressure of the fracture, MPa; L is the horizontal distance from the center of the fracture to the point, m; c is the half height of the fracture, m; v is the Poisson's ratio of the rock.

[0064] Step 3: Preliminarily select the positio...

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Abstract

The invention relates to an optimized design method for the positions of horizontal well segmented multi-cluster fracturing perforation clusters. The optimized design method comprises the steps that first, the positions of the perforation clusters of a first fracturing segment are determined according to borehole characteristics and development requirements; second, induced stress generated at a crack of the last perforation cluster of the first fracturing segment is calculated; third to sixth, the position of the first perforation cluster of an N fracturing segment is initially selected; seventh to tenth, the position of the next perforation cluster is initially selected, till the transverse transformation ranges of a perforation cluster crack and a previous perforation cluster crack are connected end to end; eleventh, the seventh step to the tenth step are repeated, till the requirement of the N fracturing segment number design is met; twelfth, the effective net pressure and induced stress of a crack at the last perforation cluster of the N fracturing segment relative to a stratum close to an (N+1) fracturing segment are calculated; and thirteenth, N is equal to N+1, the third step to the twelfth step are repeated, till the requirement of the transformation length of the horizontal segment of a well is met. The optimized design method better conforms to the actual working condition of segmented multi-cluster fracturing.

Description

technical field [0001] The invention relates to a horizontal well staged multi-cluster fracturing reservoir transformation technology, in particular to a horizontal well staged multi-cluster fracturing perforation cluster position optimization design method. Background technique [0002] Horizontal well staged multi-cluster fracturing technology is an effective means to develop unconventional low-permeability reservoirs. This technology can not only realize the communication between artificial fractures and natural fractures, but also use induced stress to promote stress diversion to generate diverted branch fractures. A complex fracture network is formed in the formation, which makes the seepage distance of oil and gas in the matrix in any direction "shortest" to the fractures, which greatly improves the overall permeability of the reservoir and the productivity and ultimate recovery of oil and gas wells. [0003] The formation of complex fracture networks in unconventional...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/11G06F17/50
CPCE21B43/11E21B43/26G06F30/00
Inventor 冯福平胡超洋王胡振刘振宇赵景原严茂森
Owner 来安县永阳知识产权运营有限公司
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