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Method for opening sand-blasting hole of horizontal well by coiled tubing

A technology for sandblasting holes and horizontal wells, which is applied in the valve device of wellbore/well, production fluid, earthwork drilling, etc., can solve the problem that the sliding sleeve cannot be opened normally, save manpower, improve construction efficiency, and structural principle simple effect

Inactive Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for opening sandblasting holes in horizontal wells by using coiled tubing to solve the problem that sliding sleeves in horizontal well sections cannot be opened normally

Method used

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  • Method for opening sand-blasting hole of horizontal well by coiled tubing
  • Method for opening sand-blasting hole of horizontal well by coiled tubing
  • Method for opening sand-blasting hole of horizontal well by coiled tubing

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Embodiment Construction

[0019] Such as Figure 1~5 As shown, the present invention is a method for opening the sandblasting hole 10 of a horizontal well by using coiled tubing 7. In the multi-layer segmental fracturing string of a horizontal well, multiple groups of sandblasting tubes 4, lower joint 5 and packer 6, and use packer 6 to separate each interval a~h. Wherein: each sandblasting cylinder 4 is respectively provided with two split sandblasting holes 10, the inside of the sandblasting cylinder 4 is sleeved with a sliding sleeve 13, and the sliding sleeve 13 is fixed on the inner wall of the sandblasting cylinder 4 by pins 11 and The sandblasting holes 10 of each layer section a~h are closed, and a sealing ring 9 is arranged between the sliding sleeve 13 and the sandblasting cylinder 4. The sliding sleeve 13 can slide toward the bottom M of the pipe string in one direction under the action of external force to open The sandblasting holes 10 on the sandblasting cylinder 4 are used for fracturin...

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Abstract

The invention provides a method for opening a sand-blasting hole of a horizontal well by a coiled tubing. A sliding sleeve sliding unidirectionally is arranged at the position of the sand-blasting hole on the tubing in the horizontal well, a sealing head is arranged at the tail end of the coiled tubing and extends into the tubing along with the coiled tubing, the coiled tubing applies bit pressure to enable the sealing head to seal the sliding sleeve, and the sliding sleeve is pushed to slide downward on the inner wall of the tubing by annular pressure between the coiled tubing and the tubing, so that the sand-blasting hole on the tubing is opened. Since the problem that the sand-blasting hole cannot be opened by a conventional method can be effectively and timely solved, the multi-packer multistage sliding sleeve staged fracturing technology is effectively guaranteed to be smoothly implemented in the horizontal well, and a gap in the domestic technology of opening the sand-blasting hole of the horizontal well by the coiled tubing is filled. The method for opening the sand-blasting hole of the horizontal well by the coiled tubing open is simple in structural principle, low in construction cost and quite wide in application prospect, the sliding sleeve can be effectively sealed, normal opening of the sand-blasting hole is guaranteed by annular pressure, and construction efficiency is improved while labor power, material resources and financial resources are saved.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for opening sandblasting holes by using coiled oil tubing in the staged fracturing reconstruction process of multi-stage sliding sleeves of multi-packers in horizontal wells. Background technique [0002] With the development of the oil and gas drilling industry, in order to effectively increase the single-well production of horizontal wells in low-permeability and thin-bed gas reservoirs, the transformation process of multi-packer multi-stage sliding sleeve staged fracturing is generally adopted, and one trip of pipe strings is used to achieve Synchronous production of multiple sections of horizontal wells. Such as figure 1 As shown, in the staged fracturing string, the sandblasting tube 4, the lower joint 5 and the packer 6 are sequentially connected under the tubing 2, and the packer 6 is used to separate the intervals a to h, corr...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B34/08
Inventor 吴方益曹学军曾晓建傅伟蒋春光刘华杰李晖陈介骄兰沆源刘振兴王翔易祖坤王绍红刘丹婷张智强涂生旭
Owner CHINA PETROLEUM & CHEM CORP
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