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Casing Infinite Stage Fracturing Method

A staged fracturing, infinite-level technology, applied in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve problems such as increasing operation time, achieve high opening efficiency, high construction pressure, and shorten fracturing construction. effect of cycles

Active Publication Date: 2017-07-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the perforation is completed, the perforating fluid needs to be replaced, which increases the operating time

Method used

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  • Casing Infinite Stage Fracturing Method
  • Casing Infinite Stage Fracturing Method
  • Casing Infinite Stage Fracturing Method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The infinite sliding sleeve 2 includes an upper joint 201, a central pipe 202, a piston 209, a lock ring 210, an outer cylinder 203, a connecting sleeve 206 and a lower joint 205. The upper end of the central pipe 202 snaps into the upper joint 201, and the two are longitudinally corresponding Sandblasting holes 213 are provided at all positions; the upper end of the outer cylinder 203 is connected with the upper joint 201 through threads, and the lower end is connected with the lower joint 205 through the connecting sleeve 206; the top end of the lower joint 205 withstands the central pipe 202; the outer cylinder 203 and the connection part of the upper joint 201 are stuck with a lock ring 210; the outer surface of the piston 209 is provided with inverted teeth, which can be stuck on the lock ring 210 to prevent the p...

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PUM

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Abstract

The invention discloses a casing infinitely staged fracturing method, which comprises the following steps: 1) running a casing cementing string; 2) running a service tool to the bottom of an artificial well; 3) lifting a coiled tubing and using a mechanical coupling The locator positions the infinitely-staged sliding sleeve at the bottom; 4) Seats the repeatable sealing and unsealing tool in the infinitely-staged sliding sleeve at the bottom, between the upper and lower through holes; 5) Fracturing: After the repeatable seating and unsealing tool is fully seated, the annulus is pressed, the piston is pushed down and stuck on the lock ring, the infinite sliding sleeve is opened, and sand is added for fracturing; 6) After the fracturing is completed, lift the Coiled tubing, unsealing and repeatable setting and unsealing tool; 7) Using the method of step 3), position the infinitely-staged sliding sleeve 2 upward in turn; 8) Repeat steps 4) to 7) until the fracturing of the entire well section is completed . The method can greatly shorten the construction period, improve the fracturing efficiency and reduce the construction cost.

Description

technical field [0001] The invention relates to the field of oil drilling, in particular to a casing infinitely staged staged fracturing method. Background technique [0002] With the increasing development of horizontal wells in China, the staged fracturing technology of horizontal wells has gradually become the main technology in the development process of horizontal wells, which is generally divided into open hole completion and casing completion. At present, the most widely used casing completion techniques are hydrojet technology without string, hydrojet bridge plug isolation casing fracturing technology, and coiled tubing with bottom seal sandblasting and perforating staged fracturing technology. The hydraulic jet technology of the fixed string connects the hydraulic sandblasting tool into the well through the tubing, and opens the sliding sleeves at all levels by throwing balls to realize multi-stage fracturing. Usually, casing main fracturing and tubing rehydration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/12
Inventor 丁柯宇程智远徐玉龙李梅何志勇张永忠刘志斌姚卫东孙鑫杨永青郭鸣王瑶
Owner BC P INC CHINA NAT PETROLEUM CORP