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Oil and gas well underground straddle packing layer-by-layer fracture acidizing tool tubular column structure

A technology of fracturing acidification and downhole spanning, which is applied in the directions of sealing/isolation, wellbore/well components, drill pipes, etc., and can solve problems such as limited number of layers, complicated completion string and post-workover, and unsatisfactory results , to achieve the effect of simple structure

Active Publication Date: 2014-01-01
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

[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 improvement measure to realize the stimulation of oil and gas wells; the stimulation measures at the present stage mainly adopt the one-time transformation of conventional tubing without moving the string and the layering transformation of mechanical packers. limited, only 3 to 4 layers at most, and the completion string and post-workover are more complicated, so the construction technology of the existing technology often has the problem that the stimulation and transformation are not highly targeted and the effect is not ideal

Method used

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  • Oil and gas well underground straddle packing layer-by-layer fracture acidizing tool tubular column structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Structure and connection relationship of the present invention: the present invention includes a packing device and a connecting device, the packing device is composed of an upper packer 6 and a lower packer 10, and the connecting device is composed of a safety release device 2, a circulation valve 3, and a positioner 4. Supporting formal hydraulic anchor 5, upper adjustment short circuit 7, sand blasting acid sprayer 8, lower adjustment short circuit 9, centralizer 11, upper packer 6 connected to vertical hydraulic anchor 5 and upper adjustment short circuit 7 Between them, the lower packer 10 is connected between the lower adjustment short-circuit 9 and the centralizer 11, and the present invention is connected in the following order from top to bottom: safety release device 2, circulation valve 3, positioner 4, and support type hydraulic anchor 5. Upper packer 6, upper adjustment short connection 7, sand blasting acid sprayer 8, lower adjustment short connection 9, lo...

Embodiment 2

[0016] Main purpose of the present invention: in the construction process, the device of the present invention has the following important functions: the safety release device 2 is arranged on the uppermost end of the string, the upper end of the safety release device 2 is connected to the coiled tubing 1, and the safety release device 2 It is controlled by shear pins and claws. After each construction is completed, when the pipe string needs to be pulled out, if the downhole pipe string is stuck by sand settling, in order to pull out the unstuck pipe string in time, it can be thrown from the safety The hand device 2 is separated, and all the coiled tubing 1 on the upper part is pulled out, which can reduce losses; the circulation valve 3 is set at the lower end of the safety device 2, and can be opened by counter-pressing or throwing a ball to suppress the pressure. During the construction process, if the When the backwashing sand process is not available for sand plugging, th...

Embodiment 3

[0018] Process of the present invention: the present invention is composed of the following components: the uppermost end is a coiled tubing 1, and the following are connected in turn with a safety release device 2, a circulation valve 3, a positioner 4, a support type hydraulic anchor 5, an upper packer 6, an upper Adjusting short connection 7, sandblasting and acid blasting device 8, lower adjusting short connection 9, lower packer 10, centralizer 11, the lowermost end of the pipe string is connected to the check valve 12; the above components are connected by threads, and the above components are composed The pipe string is lowered to a certain depth in the downhole casing 13 of the oil and gas well with a coiled tubing operation vehicle, and positioned by the positioner 4 so that the upper and lower packers 6 and 10 are positioned at the upper end of the perforated interval below At the same time, the side holes of the sandblasting and acid spraying device 8 are also aligne...

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Abstract

The invention discloses an oil and gas well underground straddle packing layer-by-layer fracture acidizing tool tubular column structure, relates to the technical field of underground tool manufacturing for yield increasing modification of oil and gas wells, and designs the oil and gas well underground straddle packing layer-by-layer fracture acidizing tool tubular column structure capable of realizing multi-zone layer-by-layer fracture acidizing construction. The structure is sequentially connected with a back-off machine, a circulating valve, a positioned, a centralizing hydraulic anchor, an upper packer, an upper adjustment pup joint, a sand blasting and acid jetting machine, a lower adjustment pup joint, a lower packer and a centralizer, can solve the problem of not strong pertinency of yield increasing modification positions in the prior art, and has the characteristic of simple structure.

Description

Technical field: [0001] The utility model relates to an oil-gas well downhole straddle-type layer-by-layer fracturing and acidizing tool string structure, which is used for oil-gas well downhole fracturing and acidizing construction, and relates to the technical field of downhole tool manufacturing for oil-gas well fracturing and acidizing stimulation. 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 improvement measure to realize the stimulation of oil and gas wells; the stimulation measures at the present stage mainly adopt the one-time transformation of conventional tubing without moving the string and the layering transformation of mechanical packers. limited, only 3-4 layers at most, and the completion string and post-workover are relatively complicated, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B33/122E21B17/02E21B17/10
Inventor 陆灯云张道鹏叶登胜石孝志潘勇李国庆张剑
Owner BC P INC CHINA NAT PETROLEUM CORP
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