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Coiled tubing and packer combined staged fracturing string and method for slim hole well

A staged fracturing and packer technology, applied in wellbore/well components, sealing/isolation, earthwork drilling and production, etc., can solve problems affecting wellbore maintenance and repeated reconstruction, and high construction risk, so as to benefit the later stage The effect of repeated transformation, expansion of transformation scale, reduction of maintenance and processing difficulty and operational risk

Active Publication Date: 2021-01-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the existing construction risks are high and due to the diameter change in the pipe, which affects the maintenance and repeated reconstruction of the wellbore in the later stage, the present invention provides a segmental fracturing string and method for a slim-bore well with coiled tubing and a packer. After the reservoir is reformed in the present invention, the wellbore has a full diameter, which reduces the difficulty of maintenance and processing of the wellbore and the operation risk in the later stage, and is beneficial to repeated reconstruction in the later stage

Method used

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  • Coiled tubing and packer combined staged fracturing string and method for slim hole well

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Embodiment 1

[0029] In order to overcome the existing problems of large construction risks and the influence of later wellbore maintenance and repeated transformation due to the diameter change in the pipe, the present invention provides such figure 1 In the shown slim-bore well, coiled tubing and packer are used as staged fracturing strings and methods. After reservoir reconstruction in the present invention, the wellbore has a full diameter, which reduces the difficulty of wellbore maintenance and operation risks in the later stage, and is conducive to later repetition. remodel.

[0030] Coiled tubing and packer are used as a staged fracturing string for slimhole wells, including casing 1, coiled tubing 2, connector 3, hydraulic safety handle 4, hydraulic sand blaster 5, upper packer 6, Sliding sleeve seat 7, variable diameter drop-back barrel 8, lower packer 9, tubing 10, multiple bottom packers, floating hoop 14, guide screen 15 and open hole section 16, the coiled tubing 2 is located ...

Embodiment 2

[0040] Based on Embodiment 1, in this embodiment, preferably, the variable-diameter throw-back sleeve 8 is a cylindrical structure with a small upper end and a larger lower end.

[0041] Preferably, the plurality of bottom packers are connected through short joints of tubing.

[0042] Preferably, the coiled tubing 2 has a pipe diameter of 1"~1½", and the casing 1 is a 5½" casing.

[0043] Preferably, the naked eye section 16 is a 4" naked eye section.

[0044] Preferably, the lower packer 9 is a Y441 packer, and the bottom packer is a Y341 packer.

[0045] The middle and upper packer of the present invention adopts a controllable packer, and the large-diameter part of the variable-diameter drop-back barrel 8, Y441 packer, tubing 10, multiple Y341 packers, floating hoop 14, and guide screen in the present invention Pipe 15 constitutes the isolated string.

[0046] Coiled tubing 2, connector 3, hydraulic safety handle 4, hydraulic sandblasting device 5, controllable packer 6,...

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Abstract

The invention provides a coiled tubing and packer combined staged fracturing string and method for a slim hole well. The string comprises a casing pipe, a coiled tubing, a connector, a hydraulic safety release, a hydraulic sandblaster, an upper packer, a sliding sleeve base, a reducing release tie-back barrel, a lower packer, an oil pipe, a plurality of bottom packers, a float collar, a guide screen pipe and an open hole section, the coiled tubing is located in the casing pipe, and the lower end of the coiled tubing is connected with the hydraulic safety release through the connector. The string is lowered to a preset position of a target reservoir, steel balls of the specified specification are pumped to set the packer, the fracturing string is released, packing of an original reservoir and a new reservoir transformation section is achieved, then segment-by-segment transformation is conducted through the fracturing string, after transformation is completed, the fracturing string is pulled out, and a production string is lowered; and after the reservoir is transformed, a wellbore has a full bore, the later wellbore maintenance and treatment difficulty and operation risk are reduced, and later secondary transformation is facilitated.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil field exploration and development, in particular to a segmented fracturing string and a method for combining a coiled tubing and a packer for slim wells, and is suitable for sidetracking in oil and gas fields or segmental fracturing of oil and gas wells similar to slim holes. Crack transformation. Background technique [0002] As most oil reservoirs in China are gradually entering the middle and late stage of development, it is extremely urgent to effectively produce remaining oil in the formation and fully tap the potential of the reservoir. It is particularly urgent to maintain stable production in mature areas at low cost. Considering factors such as reducing drilling investment, land acquisition costs, and ground equipment costs, in the original As an effective technology, sidetracking new wellbore in old well intervals has been paid more and more attention. For reservoirs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/14E21B43/26E21B43/114E21B33/122
CPCE21B43/14E21B43/26E21B43/114E21B33/122
Inventor 姜勇周志平张宏福刘锐任国富赵晓伟史玮平高伟仵海龙许飞
Owner PETROCHINA CO LTD
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