System and method capable of achieving hydraulic jetting continuous sand filling and layered fracturing

A layered fracturing and hydrojet technology, which is applied in directional wells, horizontal wells, and vertical wells, can solve the problems of not having sand washing function, achieve high construction efficiency, ensure isolation reliability, The effect of increasing the number of construction stages

Pending Publication Date: 2017-05-31
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantage that the existing hydraulic jet fracturing tube does not have the function of sand washing and needs to be lowered into the sand washing tube once, the purpose of the present invention is to propose a system and a hydraulic jet fracturing system that can realize continuous sand filling and layered fracturing. method

Method used

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  • System and method capable of achieving hydraulic jetting continuous sand filling and layered fracturing

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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the embodiment of the present invention provides a system capable of realizing hydraulic jet continuous sand filling layered fracturing, the system includes a downhole process string, and a wellhead continuous sand washing device connected to the upper end of the downhole process string.

[0029] The working principle of the present invention is: by connecting a wellhead continuous sand washing device on the downhole process pipe string, the downhole process is controlled to carry out perforation injection and continuous sand filling, and then the wellhead continuous sand washing device is used for sand washing. The sand seal replaces the bottom seal, which avoids damage to the bottom packer of the pipe string, ensures the reliability of the seal, and improves the number of construction sections of the pipe string and construction safety.

Embodiment 2

[0031] On the basis of Example 1, such as figure 1 As shown, the wellhead continuous sand washing device includes a ring valve body 7; the two ends of the ring valve body 7 are respectively connected with an upper nipple 3 and a lower nipple 12; the inner upper nipple 3 of the ring valve body 7 A central pipe 9 is connected between the lower short joint 12; the upper end of the central pipe 9 is provided with a thread plug 6; an annular space is formed between the central pipe 9 and the ring valve main body 7, and the upper short joint 3 It communicates with the annular space to form a liquid flow channel, and a piston 8 is slidably arranged in the annular space, and the piston 8 is movable to block the liquid flow channel; the upper part of the central tube 9 is provided with a The side hole of the heart tube communicated; the ring valve body 7 is provided with a ring valve side hole communicating with the annular space; the ring valve body 7 is provided with a main body slee...

Embodiment 3

[0039] On the basis of Embodiment 1, the downhole process string includes a casing 23, an oil pipe 19 arranged in the casing 23, a safety drop 20 is connected to the lower end of the oil pipe 19, and a safety drop 20 is connected to the lower end of the safety drop 20 through a pipeline. The injector 21 is connected with a pilot check valve 22 at the lower end of the injector 21 . The process is simple in structure and convenient in construction.

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Abstract

The invention relates to the technical field of oilfield fracturing, in particular to a system and method capable of achieving hydraulic jetting continuous sand filling and layered fracturing. The system includes an underground technique pipe column and a wellhead continuous sandblasting device which is connected with the upper end of the underground technique pipe. According to the method, after the underground technique pipe column performs hole jetting and continuous sand filling, the wellhead continuous sandblasting device is used for sandblasting, sand-filling packing replaces bottom- seal packing, the damage of a pipe column bottom packer is avoided, the reliability of packing is ensured, and the construction section number and construction safety of the pipe column are improved.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing, in particular to a system and method capable of realizing hydraulic jet continuous sand filling layered fracturing. The device and method are suitable for layered fracturing reconstruction of vertical wells, directional wells, and horizontal wells. Background technique [0002] The hydraulic sand blasting perforation and fracturing integrated pipe string usually adopts the process string dragging of injector and bottom packer to realize multi-stage fracturing. This process string can eliminate the influence of layer heterogeneity and seal The interval is more reliable, so it is widely used. [0003] For tight oil reservoirs, it is necessary to implement large-displacement volume fracturing to form complex network fractures, increase the drainage area, and achieve the purpose of increasing production and efficiency. Volumetric fracturing of tight oil reservoirs is carried out, but on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B21/00E21B21/10
CPCE21B21/00E21B21/106E21B43/26
Inventor 姜勇范登洲杨志伟刘锐赵晓伟史玮平海显莲张明霞张国庆
Owner PETROCHINA CO LTD
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