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

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Problems solved by technology

[0004] The present invention provides a system and method for realizing balanced expansion of multi-cluster fractu

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025]Example one:

[0026]Referencefigure 1 withimage 3The shown system for realizing staged multi-cluster fracturing and multi-fracture balanced expansion of a horizontal well includes at least a horizontal well bore casing 1 and a bridge plug 4. The bridge plug 4 is arranged on the horizontal well bore casing 1, and also includes a smart casing Pipe sliding sleeve 2 and surface controller 5; there are multiple smart casing sliding sleeves 2, and one smart casing sliding sleeve 2 is set on different clusters of different fracturing sections of the horizontal wellbore casing 1. The ground controller 5 is set on the ground, and is electrically signaled to a plurality of smart casing sliding sleeves 2.

[0027]In the specific application of the present invention, after the horizontal well is drilled, multiple smart casing sliding sleeves 2 are connected to the casing, and each section is provided with a smart casing sliding sleeve according to the number of fracturing clusters in the fract...

Example Embodiment

[0031]Embodiment two:

[0032]Referencefigure 1 In the illustrated system for realizing staged multi-cluster fracturing and multi-fracture balanced expansion of horizontal wells, on the basis of Embodiment 1, the surface controller 5 adopts a PLC controller.

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

Example Embodiment

[0034]Example three:

[0035]Referenceimage 3Shown is a system for realizing staged multi-cluster fracturing and multi-fracture balanced expansion of horizontal wells. Based on the first embodiment, the smart casing sliding sleeve 2 includes an upper joint 6, a lower joint 7, a shell 8, The inner sleeve 9, the signal receiver 10, the flow signal transmitter 11, the flow measuring instrument 12, the driver 13, the screw 14 and the movable joint 15; the two ends of the shell 8 are respectively connected with the upper joint 6 and the lower joint 7, The upper joint 6 is connected with the upper casing male buckle, and the lower joint 7 is connected with the lower casing female buckle; the casing 8 is provided with an outlet groove 17 and an inner sleeve 9 for closing the outlet groove 17 is fixed in On the inner side wall of the housing 8; the inner sleeve 9 is connected to the lower end of the screw 14 through a movable joint 15, the upper end of the screw 14 is connected to the driver 1...

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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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