Overflow well cement injection valve and overflow well cement injection pipe column
An overflow well and ash injection technology, which is applied to wellbore/well components, wellbore/well valve devices, sealing/isolation, etc., can solve the problems of cement slurry holding oil pipes, etc., to ensure one-way flow Effect
Pending Publication Date: 2022-07-15
CHINA PETROLEUM & CHEM CORP +1
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- Description
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Problems solved by technology
[0007] The purpose of the present invention is to provide an overflow well ash injection valve to solve the technical problem in the prior art that cement slurry is prone to fix the oil pipe when the lifting equipment breaks down; it also provides an overflow well ash injection string, To solve the above technical problems
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specific Embodiment 1
[0031] like figure 1 and figure 2 As shown, the overflow well ash injection pipe string is suitable for the overflow condition of the upper formation 100 when the lower formation 200 is plugged. The overflow well ash injection pipe string 2 includes the overflow well ash injection valve 5 and the cross fork 6 arranged up and down in sequence, and the two are connected by the oil pipe 7 or directly connected. Oil pipes 7 are connected to the bottom.
[0032] The structure of the overflow well ash injection valve 5 is as follows figure 2 As shown, the overflow well ash injection valve 5 includes an upper joint 51, an outer cylinder 52, and a lower joint 53 connected in sequence from top to bottom. The upper and lower ends of the upper joint 51 are processed with female threads, and the upper end is connected with the oil pipe 7; The upper end of 52 is machined with male threads, the lower end is machined with female threads, and the male threads at the upper end of the oute...
specific Embodiment
[0060] The structure of the overflow well ash injection valve is the same as the structure of the overflow well ash injection pipe string, and will not be repeated here.
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The invention belongs to the technical field of well hole plugging, and particularly relates to an overflow well cement injection valve and an overflow well cement injection pipe column for sealing a lower stratum. The overflow well cement injection valve comprises an upper connector, an outer cylinder and a lower connector, the outer cylinder and the lower connector are sequentially connected with the lower end of the upper connector, an inner cylinder is arranged on the outer cylinder or the lower connector, a flow channel is formed in the inner cylinder or formed between the inner cylinder and the outer cylinder, the flow channel is communicated with the upper connector, and the inner cylinder is provided with a communicating hole which is communicated with the flow channel and an inner cavity of the inner cylinder and extends in the radial direction. A one-way valve is installed in the inner cylinder through a shear pin, liquid can flow through the one-way valve from top to bottom, and after the shear pin is cut off, the one-way valve can slide relative to the inner cylinder in a sealed mode. The one-way valve has a closed state for closing the communicating hole, and when the one-way valve is in the closed state, the upper connector and the lower connector are in one-way communication through the one-way valve; the one-way valve further has a backwashing state that the shear pin is pushed upwards by liquid after being sheared off so as to keep away from the communicating hole, and when the one-way valve is in the backwashing state, the upper connector and the lower connector are communicated.
Description
technical field [0001] The invention belongs to the technical field of plugging wellbore, and in particular relates to an overflow well ash injection valve and an overflow well ash injection pipe string for sealing lower strata. Background technique [0002] Most oilfields are multi-layer systems, and the water content and pressure of each layer are different. During the development process, especially in the later stage of water injection development, the contradiction between layers becomes more and more prominent, and cement plugs (ie, ash injection) are often required to seal the lower part. High aquifers temporarily unused or abandoned. The general process of the cement plugging process is to run the cement plug string into the casing at the set depth position (the end is located above the formation to be sealed), and then use clean water to circulate the well to clean the wellbore and cool it down. Inject cement slurry into the well into the cement plug string and rep...
Claims
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IPC IPC(8): E21B34/10E21B34/08E21B33/13
CPCE21B34/10E21B34/08E21B34/063E21B33/13E21B2200/04E21B2200/06
Inventor 秦世群宋保建马宏伟林波朱雄军张峰
Owner CHINA PETROLEUM & CHEM CORP