Underground stable joint for leaking stoppage operation
A working well and stable technology, applied in drilling equipment, wellbore/well components, earthwork drilling and other directions, can solve the problem of tubing collision against the inner wall of casing, and achieve the effect of improving service life, increasing stability and improving transportation efficiency.
Active Publication Date: 2022-04-08
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology
[0004] In order to solve the above problems, the present invention proposes a downhole stable joint for plugging operations. The joint structure can solve the problem that the tubing collides with the inner wall of the casing when the plugging agent flows at high speed.
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Embodiment 1
[0033] combine figure 1 , figure 2 As shown, a downhole stable joint used for plugging in this embodiment, the upper joint 1 used to connect the tubing is a concave joint with an annular space inside, and threads are provided inside it for connecting with the tubing joint , the size of the outer wall of the upper joint 1 is greater than the size of the outer wall of the intermediate working string 7 .
[0034] Such as figure 1 As shown, through-holes 10 are set in the middle of the middle working string 7, the size of the through-holes 10 is kept consistent, and the through-holes 10 are evenly distributed around the circumference of the middle working string 7 at equal intervals. When the difference passes through the through hole 10, the flow velocity of the through hole 10 is equal to ensure that the leak blocking agent 15 can enter the high elastic rubber ring 5 to expand evenly under the action of the pressure difference, and further fill the gap between the joint and t...
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The invention relates to the technical field of oil pipe connection in oil production engineering, in particular to an underground stable joint for leaking stoppage operation, which is characterized in that a high-elasticity rubber ring is sleeved in the middle of a middle working pipe column, the edges of two side end parts of the high-elasticity rubber ring are hermetically connected with the middle working pipe column, and a through hole corresponding to the high-elasticity rubber ring is formed in the middle working pipe column; t-shaped channels are formed in the positions, close to the two ends, of the outer wall of the middle working pipe column correspondingly, the T-shaped components are clamped in the T-shaped channels, the second springs are arranged in the T-shaped channels, the two ends of the second springs abut against the tail ends of the T-shaped channels and the T-shaped components correspondingly, and the portions, on the two sides of the high-elasticity rubber ring, of the T-shaped components are connected through steel rings correspondingly; the elastic steel sheet is in a long strip shape, and the two ends of the elastic steel sheet are connected with the steel ring through first springs respectively. The joint structure can solve the problem that an oil pipe collides with the inner wall of a sleeve when a plugging agent flows at a high speed.
Description
technical field [0001] The invention relates to the technical field of oil production engineering tubing connections, in particular to a downhole stable joint used for plugging operations. Background technique [0002] In recent years, with the continuous deepening of oil and gas development, major oil fields have gradually entered the middle and late stage of development, the contradiction between wellbore technical status and production has become increasingly prominent, the difficulty of mining has increased, and problems in downhole operation technology have also increased. [0003] During the plugging operation, the process of pumping the plugging agent into the bottom of the well will cause vibration at the bottom of the tubing string due to the high-speed flow of the plugging agent fluid and the high pumping pressure. The additional dynamic load generated by the vibration at the bottom of the tubing string will change the stress distribution of the tubing string, and ...
Claims
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IPC IPC(8): E21B17/02E21B33/127
CPCY02E10/10
Inventor 孙源秀温航张伟杰李剑虹陈盼盼白钰岩
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY