Selective re-fracturing technology for old well of oil field

A technology of repeated fracturing and process technology, which is applied in the directions of wellbore/well components, production fluids, earth-moving drilling and production, etc., to achieve the effect of simple structure, convenient operation and high efficiency

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a selective refracturing technology for old wells in oilfields, which can effectively solve the problem of repeated reconstruction of old wells in oilfields

Method used

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  • Selective re-fracturing technology for old well of oil field
  • Selective re-fracturing technology for old well of oil field
  • Selective re-fracturing technology for old well of oil field

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Embodiment

[0019] refer to Figures 1 to 5 The embodiment of the technology of the present invention is further described:

[0020] Taking an old horizontal well in an oil field as an example, there are two intervals that have been transformed, and now it is necessary to re-perforate and add two intervals to be transformed. The process string used in this construction consists of oil pipe 1, safety hand 2, upper packer 3, middle packer 4, hydraulic jet 5, lower packer 6, ball seat 7, check valve 8, eye pipe 9 and plug 10 form.

[0021] The concrete process steps of the technology of the present invention are as follows:

[0022] 1) According to the needs of repeated transformation and the designed interval, assemble and lower the pipe string (see figure 2 );

[0023] 2) Drag the pipe string several times to complete the perforation operation in the required reformation interval (see figure 2 , 3 );

[0024] 3) After the perforation of all intervals to be reformed is completed, t...

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Abstract

The invention discloses a selective re-fracturing technology for an old well of an oil field. The selective re-fracturing technology for the old well of the oil field is designed to achieve re-transformation of the old well of the oil field effectively. According to the selective re-fracturing technology for the old well of the oil field, perforation of an interval needing to be transformed is achieved by assembling a pipe column, placing the pipe column in the well and dragging the pipe column, fracturing of a lowest new interval is achieved by packing an upper packer and an intermediate packer, unpacking is conducted, and the pipe column is dragged to a second new transformed interval. According to the selective re-fracturing technology for the old well of the oil field, a duct with the large diameter and the deep penetration is formed through hydraulic jet perforation, and thus fracturing pressure can be effectively reduced; the requirements for supporting facilities of a well mouth and the steel grade of a sleeve are lowered by means of the advantage of the dual-packing and single-clamping fracturing technology. The selective re-fracturing technology for the old well of the oil field has the advantages that the pipe column is simple in structure, the construction method is flexible, operation is convenient, the efficiency is high, re-transformation of the old well of the oil field can be achieved effectively, re-fracturing of the transformed interval can be achieved, and perforating and fracturing of the new interval can also be achieved integrally.

Description

technical field [0001] The invention relates to a selective repeated fracturing technology for old wells in oil fields, and belongs to the technical field of fracturing in oil and gas fields. Background technique [0002] Conventional hydraulic sandblasting fracturing is to drag the hydraulic sandblasting fracturing string with bottom seal to carry out multi-layer or multi-stage fracturing of construction wells, which can only ensure the isolation of the lower layers that have been constructed. For old wells, the newly designed stimulated intervals may be distributed in the middle of the stimulated intervals, and conventional strings cannot meet the requirements of isolating the upper stimulated intervals. For double-seal and single-chamber fracturing, conventional perforation needs to be performed on all construction intervals of the construction well, which is likely to cause compaction damage in the vicinity of the wellbore when the hole is formed, and affect the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
Inventor 冯飞付钢旦桂捷任勇冯长青何华刘明
Owner PETROCHINA CO LTD
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