Low-frequency hydraulic pulse generating device and method for reservoir temporary-plugging diversion fracturing

A generating device and hydraulic technology, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of uncontrollable steering uncertainty, etc., to improve the conductivity of fractures, inhibit the settlement of fracturing sand, The effect of reducing the crack initiation pressure

Active Publication Date: 2017-10-24
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

In the construction of conventional temporary plugging and refracturing technology, there is great uncertainty and uncontrollability in whether the diversion can be realized, and there is no effective and feasible method at present

Method used

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  • Low-frequency hydraulic pulse generating device and method for reservoir temporary-plugging diversion fracturing
  • Low-frequency hydraulic pulse generating device and method for reservoir temporary-plugging diversion fracturing
  • Low-frequency hydraulic pulse generating device and method for reservoir temporary-plugging diversion fracturing

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a Figure 1 to Figure 5 The shown low-frequency hydraulic pulsation generating device and method for temporarily plugging and turning to fracturing of the reservoir, such as figure 1 As shown, it includes a cylinder body 2 and an upper joint 1 and a lower joint 13 respectively connected to the upper end and the lower end of the cylinder body 2. The cylinder body 2 is provided with a matching piston 3, such as figure 2 As shown, the upper part of the piston 3 is a cylindrical structure, the lower part is a cone structure, the upper end of the piston 3 is provided with a throttling device 4, the inside of the piston 3 is provided with a guide hole 10, and the throttling hole in the center of the throttling device 4 4-1 is connected up and down with the guide flow hole 10, and the diameter of the throttle flow hole 4-1 can be enlarged under the erosion of the fracturing fluid. The bottom of the piston 3 is provided with a return spring 11. The wa...

Embodiment 2

[0050] On the basis of embodiment 1, this embodiment provides a kind of figure 1 In the low-frequency hydraulic pulsation generating device and method for temporarily plugging and diverting fracturing of reservoirs shown, a pressure guiding hole 5 is arranged on the upper part of the piston 3 in the circumferential direction, and the pressure guiding hole 5 communicates with the throttling flow hole 4-1. Prevent pressure holding, reduce the pressure inside the cylinder during construction, prolong the practical life of the device, and at the same time reduce the fracturing sand from entering the gap between the piston and the cylinder to prevent jamming. The four pressure guide holes 5 are evenly distributed along the circumference of the piston 3, and the diameter of the pressure guide holes 5 is 3 mm to 4 mm.

[0051] Further, in order to prevent the piston 3 from being stuck by sand grains when going up and down, as image 3 As shown, the outer circumference of the lower p...

Embodiment 3

[0054] On the basis of embodiment 1, this embodiment provides a kind of figure 1 In the low-frequency hydraulic pulsation generating device and method for temporarily plugging and diverting fracturing of the reservoir shown, the length of the cylindrical structure on the upper part of the piston 3 accounts for one-third of the total length of the piston 3, and the taper of the cone structure on the lower part of the piston 3 is 1: (10-12).

[0055] The size of the throttling hole 4-1 on the throttling device 4 is determined by injecting a viscous plugging agent with a small displacement during the temporary blocking stage to ensure that low-frequency hydraulic pulsation can be generated. The diameter of the throttling hole 4-1 ranges from 10mm to 12mm, the length ranges from 20mm to 22mm, the diameter of the diversion hole 10 is 16mm to 20mm, and the length is 200mm to 220mm.

[0056] The first pressure relief hole 6, the second pressure relief hole 7, and the third pressure ...

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Abstract

The invention discloses a low-frequency hydraulic pulse generating device and method for reservoir temporary-plugging diversion fracturing. The low-frequency hydraulic pulse generating device comprises a cylinder body, an upper connector and a lower connector, wherein the upper connector and the lower connector are connected to the upper end and the lower end of the cylinder body correspondingly; a piston matched with the cylinder body is arranged in the cylinder body; the upper portion of the cylinder body is of a cylinder structure, and the lower portion of the cylinder body is of a cone structure; a throttling device is arranged at the upper end of the piston; a flow guiding through hole is formed inside the piston; a throttling through hole is formed in the center of the throttling device and vertically communicate with the flow guiding through hole, and the diameter of the throttling through hole can become larger under erosion of fracturing liquid; a reset spring is arranged at the bottom of the piston; and a first pressure relief hole , a second pressure relief hole and a third pressure relief hole are further circumferentially formed in the side wall, corresponding to the piston, of the cylinder body. According to the low-frequency hydraulic pulse generating device and method, based on the working displacement ranges of the injection stages of a temporary-plugging diversion repeated hydraulic fracturing operation plugging agent, a prepad fluid, a sand-carrying fluid and a displacing fluid, low-frequency hydraulic pulse output in a hydraulic driving mode is achieved, and the temporary-plugging diversion repeated hydraulic fracturing effect can be improved overall.

Description

technical field [0001] The invention relates to the field of downhole tools for fracturing operations, in particular to a low-frequency hydraulic pulsation generating device and method for temporarily blocking and diverting to fracturing a reservoir. Background technique [0002] In the development of oil and gas fields, hydraulic fracturing technology is an important technical measure for increasing oil and gas production and efficient development of low-permeability and ultra-low-permeability reservoirs. Due to various reasons, the effective period of fracturing is short, usually one to two years, and even some wells need to be fractured again after half a year, which is usually called refracturing. In addition to the low permeability of the reservoir, the main factors affecting the validity period of fracturing operations are also common reasons for the serious decline in fracture conductivity; secondly, after a long period of production in old wells, the degree of crude ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/26
CPCE21B33/13E21B43/261Y02E10/20
Inventor 王祖文张冕兰建平许洪星池晓明邓小强张文王建树聂翠平
Owner BC P INC CHINA NAT PETROLEUM CORP
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