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Annulus mechanical isolation packer for oil and gas wells

An annulus machine and packer technology, which is used in sealing/packing, wellbore/well components, earth-moving drilling, etc., and can solve the problems of unfavorable drilling and workover, multi-diameter tools, limited scale and capacity of reconstruction, etc. , to achieve the effect of easy unsealing and simple structure

Active Publication Date: 2016-03-16
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

2) The entry string in the casing is complex, with many tools and large outer diameters, which is prone to sand sticking, which is not conducive to later drilling and workover
Although the outer diameter of this pipe string is small and the structure is simple, it cannot be effectively isolated between layers, and the reconstruction scale and capacity are limited.

Method used

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  • Annulus mechanical isolation packer for oil and gas wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention discloses an annulus mechanical sealing packer for oil and gas wells, comprising a pressure balancing device and a setting and sealing device, the pressure balancing device includes a pressure balancing valve 1; the setting and sealing device includes a rubber cylinder seat 2 , rubber tube 3, cone 4, slips 5, central tube 6, centering seat 7 and lower joint 1-8; from top to bottom, the pressure balance valve 1, central tube 6, rubber tube seat 2, rubber tube 3, Cone 4, slips 5, centering seat 7, and lower joint 1-8 are sequentially connected; the pressure balance valve 1 is connected to the upper end of the center pipe 6 and is located on the rubber cartridge seat 2; the sealing head 9 in the pressure balance valve 1 It is plug-fitted with the lower joint 10 in the pressure balance valve 1.

Embodiment 2

[0028] Refer to the attached figure 1 , the best embodiment of the present invention is: including a pressure balance device and a setting and sealing device, the pressure balancing device includes a pressure balance valve 1; the setting and sealing device includes a rubber cylinder seat 2, a rubber cylinder 3, and a cone 4 , slips 5, center pipe 6, centering seat 7 and lower joint 8; pressure balance valve 1, center pipe 6, rubber cartridge seat 2, rubber cartridge 3, cone 4, slips 5, The centralizing seat 7 and the lower joint 18 are sequentially connected; the pressure balance valve 1 is connected to the upper end of the center pipe 6 and is located on the rubber cartridge seat 2; Connector two 10 plug-in type mating. The upper end of the central pipe 6 is threadedly connected to the lower joint 10 of the pressure balance valve 1 . The central tube 6 is provided with a keyway. The pressure balance device and the setting and isolation device are connected by threads from ...

Embodiment 3

[0032]The process of the present invention: the present invention is composed of the following structures in actual use: the uppermost end is a coiled tubing, and the following are sequentially connected to a CT connector, a mechanical handle, a hydraulic handle, a centralizer, a spray gun, a pressure balance valve 1, and a seal The lower end of the pipe string is connected to the guide shoe; the above-mentioned parts are connected by threads, and the above-mentioned parts are formed into a pipe string, and the coiled tubing vehicle is lowered to a certain depth in the downhole casing of the oil and gas well, and positioned through the coupling The packer is positioned, and the string is lifted up and down to set the packer to seal the lower layer that has been constructed. At the same time, the spray gun set on the upper part of the packer is also aimed at the pre-perforation and fracturing and acidizing layer. At this time, the pressure The balance valve 1 closes the internal...

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Abstract

The invention discloses an annular mechanical packer for an oil gas well, and relates to the technical field of packers. The packer comprises a pressure balance device and a set packing device, wherein the pressure balance device comprises a pressure balance valve; the set packing device comprises a rubber sleeve base, a rubber sleeve, a taper, a slip, a central tube, a righting base and a lower connector I; the pressure balance valve, the central tube, the rubber sleeve base, the rubber sleeve, the taper, the slip, the righting base, and the lower connector I are connected sequentially from the top down; the pressure balance valve is connected with the upper end of the central tube, and positioned on the rubber sleeve base; and a seal head in the pressure balance valve is matched with a lower connector II in the pressure balance valve in a plug manner. With the adoption of the manner that different layers are packed by once descent and multiple mobile positioning of a continuous oil tube, the layer-by-layer packing and annulus of the oil gas well with multiple production layers can be realized, so that the layered acid fracturing construction after the layer-by-layer abrasive perforating is facilitated.

Description

technical field [0001] The invention relates to the technical field of packers, in particular to an annulus mechanical packer for oil and gas wells. Background technique [0002] Most oil and gas reservoirs in China have multiple production layers in the vertical direction, and most of them are thin interbeds, and some even have more than 5 layers. The implementation of fracturing and acidizing is an important transformation measure to realize the production increase of oil and gas wells. For wells completed with casing, there are mainly two methods at this stage. One is to use multi-layer packers inside the casing to isolate and fracture in layers, and open the sliding sleeve by throwing a ball, and then reconstruct it layer by layer from bottom to top, and finally close the well. layer mining. [0003] For example, the authorized announcement number is CN201778799U, and the Chinese patent document with the authorized announcement date on March 30, 2011 discloses a string...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12
Inventor 张道鹏张毅超潘勇
Owner BC P INC CHINA NAT PETROLEUM CORP
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