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Staged fracturing and acidizing controllable setting packer for oil and gas wells

A technology for staged fracturing, oil and gas wells, applied in sealing/packing, wellbore/well components, production fluids, etc., can solve problems such as pipe string fracture, packer loss, interruption of construction, etc., to achieve convenient operation , Simple structure, reliable performance

Active Publication Date: 2017-04-05
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

[0004] However, the staged fracturing and acidizing packers represented by the above-mentioned patent documents cannot be started under control, and each packer must be set and sealed at the same time before construction, so that the oil-casing annulus balance pressure can only be added to the top packer during construction.
In abnormally high-pressure wells, the lower packer string that cannot apply equilibrium pressure may have overpressure, which may cause the packer to lose seal or the string to break, interrupting the construction

Method used

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  • Staged fracturing and acidizing controllable setting packer for oil and gas wells
  • Staged fracturing and acidizing controllable setting packer for oil and gas wells

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The present invention is composed of an upper joint 1, a central tube 2, a rubber tube 3, a sealing ring 4, a cylinder liner 5, a lower joint 6, an opening ball 7, a variable diameter ball seat 8, a control sleeve 9, an expanding cavity 10 and a shear nail 11. .

[0021] The lower joint 6 is provided with a diameter-expanding chamber 10 and a pressure transmission hole, a sealing ring is installed at both ends of the control sleeve 9, and a variable-diameter ball seat 8 is installed on the top of the control sleeve 9. The pressure transmission hole is sealed, and the control sleeve 9 is fixed in the inner cavity of the lower joint 6 by the shear nail 11 . The cylinder liner 5, the center pipe 2 and the lower joint 6 form a hydraulic cylinder, and the center pipe 2 above the cylinder liner 5 is covered with a rubber sleeve 3, and the upper part of the rubber sleeve 3 and the central pipe 2 are connected to the upper joint 1 by threads. The opening ball 7 does not need t...

Embodiment 2

[0023] The present invention is assembled according to the following sequence. Firstly, the sealing ring 4 is respectively installed in the annular sealing grooves of the upper joint 1, the central pipe 2, the cylinder liner 5, the lower joint 6 and the control sleeve 9 according to the requirements, and the reducing ball seat 8 is installed in the control sleeve. In the annular groove at the top of the sleeve 9, use a special installation sleeve hoop to make the reducing ball seat 8, such as figure 2 As shown, the reducing ball seat can be made into a multi-lobe arc structure, and the sealing ring 4, the reducing ball seat 8 and the control sleeve 9 are installed together in the lower joint 6, so that the shear nail installation groove on the control sleeve 9 is in line with the The mounting threaded holes of the shear pins on the lower joint 6 are aligned, and then the shear pins 11 are installed on the lower joint 6 through threaded connection, and the end of the shear pins...

Embodiment 3

[0025] When used in the field, the oil pipe is used to send the present invention to the designated position in the oil and gas well. When starting, the opening ball 7 is put into the oil pipe from the wellhead, and the opening ball 7 is located on the variable diameter ball seat 8, pressurized in the oil pipe, and the pressure rises to At a certain value, cut the shear pin 11, the control sleeve 5, the reducing ball seat 8 and the opening ball 7 move down together, and when the reducing ball seat 8 moves to face the expanding cavity 10, the reducing ball seat 8 spreads out , the inner diameter increases, and the opening ball 7 falls through the reducing ball seat 8. At the same time, the pressure transmission hole on the lower joint 6 is exposed, and the pressure is transmitted to the hydraulic cylinder composed of the cylinder liner 5, the central pipe 2 and the lower joint 6 through the pressure transmission hole, pushing the cylinder liner 5 upward, compressing and expandin...

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Abstract

The invention discloses an oil-gas well used controllable set packer for multistage acid fracturing. An upper joint is connected with the upper end of the outer part of a center pipe. A cylinder liner is connected with the lower end of the outer part of the center pipe. A lower joint is connected with the outer part of the center pipe and arranged between the center pipe and the cylinder liner. An expanded cavity and a pressure transmission hole are formed in the lower joint. The cylinder liner, the center pipe and the lower joint form a hydraulic cylinder. One end of the pressure transmission hole is communicated with the expanded cavity, and the other end of the pressure transmission hole is communicated with the hydraulic cylinder. A reducing ball seat is mounted in an annular groove on the top of a control liner. The reducing ball seat and the control liner are mounted in the lower joint and the reducing ball seat is arranged on the bottom of the center pipe. The reducing ball seat and the control liner are fixed in the lower joint by shear studs. A rubber cylinder is connected with the center pipe and arranged between the cylinder liner and the upper joint. The packer has features of simple structure, convenient operation, and reliable performance. The starting of packers in the oil-gas well can be controlled separately, and thus each packer can receive balance pressure during the multi-stage acid fracturing process.

Description

technical field [0001] The invention relates to the technical field of manufacturing downhole tools in the petroleum and natural gas industry, in particular to a staged fracturing acidification controllable setting packer for oil and gas wells. Background technique [0002] Staged fracturing and acidizing technology refers to a stimulation technology that performs fracturing and acidizing on multiple reservoir sections in the same oil and gas well. Multiple sets of packers are run simultaneously in oil and gas wells for staged fracturing and acidizing operations to separate each construction well section, and each well section is subjected to production stimulation operations. [0003] The publication number is CN103306658A, and the Chinese patent document published on September 18, 2013 discloses a step-by-step setting multi-stage fracturing string and its use method. The fracturing string includes a plurality of packers and For the fracturing sliding sleeve, each packer c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/127
CPCE21B33/127E21B43/26
Inventor 潘勇尹丛彬谢明张道鹏朱炬辉钟兴久李斌张毅超曹越
Owner BC P INC CHINA NAT PETROLEUM CORP