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System and method for realizing staged multi-cluster fracturing and multi-crack balanced expansion of horizontal well

A horizontal well, multi-fracture technology, applied in the field of oil and gas field exploration and development, can solve the problems of low fracture initiation efficiency, unbalanced multi-fracture expansion, and insufficient and effective reservoir stimulation, so as to improve the degree of control and increase the production of a single well. Effect

Active Publication Date: 2021-02-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a system and method for realizing balanced expansion of multi-cluster fracturing and multi-fractures in horizontal wells. The problem that layers cannot be fully and effectively transformed

Method used

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  • System and method for realizing staged multi-cluster fracturing and multi-crack balanced expansion of horizontal well
  • System and method for realizing staged multi-cluster fracturing and multi-crack balanced expansion of horizontal well
  • System and method for realizing staged multi-cluster fracturing and multi-crack balanced expansion of horizontal well

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Experimental program
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Effect test

Embodiment 1

[0026] refer to figure 1 and image 3 The shown system realizes multi-stage multi-cluster fracturing and multi-fracture balanced expansion of horizontal well, at least including horizontal well wellbore casing 1 and bridge plug 4, bridge plug 4 is set on horizontal well wellbore casing 1, and also includes smart casing Pipe sliding sleeve 2 and ground controller 5; said intelligent casing sliding sleeve 2 is provided with a plurality, and one intelligent casing sliding sleeve 2 is respectively arranged on different clusters of different fracturing sections of the wellbore casing 1 of the horizontal well , the ground controller 5 is arranged on the ground, and is electrically connected with a plurality of intelligent casing sliding sleeves 2 .

[0027] In the specific application of the present invention, after the drilling of the horizontal well is completed, a plurality of intelligent casing sliding sleeves 2 are connected to the casing, and each section is equipped with an ...

Embodiment 2

[0032] refer to figure 1 The shown system realizes multi-stage multi-cluster fracturing and multi-fracture balanced expansion system for horizontal wells. On the basis of Embodiment 1, the above-mentioned ground controller 5 adopts a PLC controller.

[0033] In actual use, the ground controller 5 adopts the technical solution of the present invention, so that the operation is convenient.

Embodiment 3

[0035] refer to image 3 Shown is a horizontal well staged multi-cluster fracturing and multi-fracture balanced expansion system. On the basis of Embodiment 1, the intelligent casing sliding sleeve 2 includes an upper joint 6, a lower joint 7, a housing 8, Inner sleeve 9, signal receiver 10, flow signal transmitter 11, flow measuring instrument 12, driver 13, screw rod 14 and movable joint 15; the two ends of the housing 8 are respectively connected with an upper joint 6 and a lower joint 7, The upper joint 6 is connected with the male buckle of the upper casing, and the lower joint 7 is connected with the female buckle of the lower casing; the housing 8 is provided with a liquid outlet groove 17, and the inner sleeve 9 for closing the liquid outlet groove 17 is fixed on the On the inner wall of the housing 8; the inner sleeve 9 is connected to the lower end of the screw rod 14 through the movable joint 15, the upper end of the screw rod 14 is connected to the driver 13, and t...

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Abstract

The invention belongs to the technical field of oil and gas field exploration and development, and particularly relates to a system and method for realizing staged multi-cluster fracturing and multi-crack balanced expansion of a horizontal well. The system for realizing staged multi-cluster fracturing and multi-crack balanced expansion of the horizontal well is composed of a horizontal well shaftcasing pipe, a bridge plug, intelligent casing pipe sliding sleeves and a ground controller, the bridge plug is arranged at the position, at the joint of the adjacent fracturing sections of the horizontal well, on the shaft casing pipe, the multiple intelligent casing pipe sliding sleeves are arranged, different clusters of the different fracturing sections of the horizontal well shaft casing pipeare each provided with one intelligent casing pipe sliding sleeve, and the ground controller is arranged on the ground and is in electric signal connection with the multiple intelligent casing pipe sliding sleeves. According to the system and method, the problems that multiple clusters cannot fracture completely and multiple cracks cannot be expanded and extended in a balanced manner in horizontal well staged multi-cluster fracturing are effectively solved, the multi-cluster fracturing effectiveness is improved to 100%, the multi-crack balanced expansion rate is improved to 90% or above, thecontrol degree of artificial cracks on a reservoir is remarkably improved, and finally the single-well yield of the low-permeability-dense oil and gas reservoir is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploration and development, and in particular relates to a system and method for realizing the balanced expansion of multi-cluster fracturing and multi-fracture in horizontal wells. Background technique [0002] Staged multi-cluster fracturing of horizontal wells is an important technical means to increase single well production in low-permeability-tight oil and gas reservoirs at home and abroad. In the case of multi-cluster combined compression in a single stage, due to the influence of reservoir heterogeneity among the clusters, the multi-clusters cannot completely initiate cracks, and the effectiveness of crack initiation is only about 30%, and the fractures in each cluster expand unbalanced. The degree of control over the reservoir is low, and the oil and gas reservoirs cannot be fully and effectively produced. [0003] In order to improve the effectiveness of multi-cluster fractur...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B34/14
CPCE21B43/26E21B43/267E21B34/14
Inventor 张矿生刘汉斌唐梅荣马兵杜现飞徐创朝刘顺李晓燕吴顺林拜杰
Owner PETROCHINA CO LTD
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