A downhole blowout preventer for workover operations
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A technology of operating wells and blowout preventers, which is applied in the direction of wellbore/well components, wellbore/well valve devices, buildings, etc., to achieve the effect of throttling in the pipe string
Active Publication Date: 2021-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, this kind of workover method for hot work has higher requirements for well control technology
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[0014] Below in conjunction with accompanying drawing and example the present invention will be further described:
[0015] like Figure 1-Figure 5 As shown, a downhole blowout preventer for well workover operation includes: upper joint 1, upper short joint 2, thrust joint 3, pressure bearing shear nail 4, sliding sleeve 5, upper push ring 6, lower push ring 7, lower short Section 8, upper valve seat 9, valve ball 10, lower valve seat 11, preload spring 12, central pipe joint 13, central pipe 14, back ring group I15, rubber cylinder 16, back ring group II17, torque cylinder 18, lower Connector 19. The whole tool is installed on the workover string through the upper joint 1 located at the upper part of the tool and the lower joint 19 located at the lower part of the tool. Both the upper joint 1 and the lower joint 19 are connected with the workover string through API pipe threads, and there is no abnormality in the oil and gas well When the pressure fluctuates, the tool acts ...
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Abstract
The invention relates to the field of petroleum equipment, in particular to a downhole blowout prevention tool used in well workover operations. Including: upper joint, upper pup joint, thrust joint, pressure-bearing shear pin, sliding sleeve, upper push ring, lower push ring, lower pup joint, upper valve seat, valve ball, lower valve seat, preload spring, center pipe joint , Center tube, back ring group Ⅰ, rubber tube, back ring group Ⅱ, torque tube, lower joint. The upper joint and the upper pup joint, the upper pup joint and the sliding sleeve, the lower pup joint and the lower joint, the lower push ring and the lower pup joint are all connected by ordinary threads; Spline connection; the thrust joint and the central pipe joint, the central pipe joint and the central pipe, the central pipe and the lower pup joint are all connected by API pipe threads; the valve ball is located between the upper valve seat and the lower valve seat, and the lower valve seat and the thrust joint A pre-tension spring is installed between them; the sliding sleeve and the central pipe joint are relatively fixed by pressure-bearing shear nails. The present invention realizes the blowout prevention action at the bottom of the well at any time in the workover project; while realizing the blowout prevention of the annular space, it can realize throttling inside the pipe string.
Description
technical field [0001] The invention relates to the field of petroleum equipment, in particular to a downhole blowout prevention tool used in well workover operations. Background technique [0002] As oil and gas exploitation enters the middle and later stages, a series of problems will occur in the tools in the well or the oil well itself, which will cause the suspension of oil production, and the solution of these problems requires a professional workover team to carry out. During the workover process of the workover construction team, because some oil wells have strong self-spraying ability, high gas-oil ratio or some oil wells need to take measures such as layer replenishment perforation, acid fracturing, etc., the oil wells must be repaired before starting the overhaul. The well killing fluid is used to kill the well, so that the pressure in the annulus and the pipe string is greater than the formation pressure, so as to avoid the occurrence of blowout in the workover o...
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