Full-airtight high pressure valve leakage treatment device and method

Abstract

The invention belongs to the technical field of gas / oil production and the oil exploitation industry, and relates to a full-airtight high pressure valve leakage treatment device and method. The device comprises a hydraulic under-pressure plugging unit and a valve under-pressure maintenance sealing unit. The hydraulic under-pressure plugging unit is arranged at a valve and used for plugging a channel of an oil pipe or a sleeve at a gas / oil production wellhead; the valve under-pressure maintenance sealing unit is connected with the valve and comprises a conversion nipple; a second vent valve is arranged on the conversion nipple; the left end of the conversion nipple is connected with a right port of a valve body in a sealed mode; the right end of the conversion nipple is connected with a second hydraulic cylinder in a sealed mode; and the free end of a second piston rod of the second hydraulic cylinder is arranged toward the conversion nipple and connected with the screw thread end of a lead screw of the valve. Under the condition that the gas / oil production wellhead is under pressure, firstly the channel of the oil pipe or the sleeve at the gas / oil production wellhead can be plugged through the device to form a non-pressure environment, then valve parts are disassembled, a damaged valve plate of the valve is replaced, and the valve is recovered after replacement.

Description

[0001] 【Technical Field】 [0002] The invention belongs to the technical field of gas / oil and petroleum extraction industries, and relates to a fully enclosed high-pressure valve leakage control device and method. [0003] 【Background technique】 [0004] The main components of the gas / oil wellhead device, the valve is constantly under the huge pressure of the substratum gas (oil) during long-term use, and is also corroded and washed by hydrogen sulfide gas, so the valve damage is the gas / oil wellhead device common error. At present, the conventional domestic practice for the failed main control valve is to replace a new valve or replace a new valve under pressure. A large number of failed valves were dismantled and found that the main reason for valve leakage was damage to the combined seal, valve plate, and valve seat. Yes, damage to the combined seal and valve plate is more common. After the valve plate is damaged, the damaged valve plate cannot be replaced directly due to the cur...

AI Technical Summary

Problems solved by technology

At present, the domestic routine for the main control valve with failure is to replace the valve with a new one during the well killing operation or with a new valve under pressure. Dismantling a large number of faulty valves found that the main cause of valve leakage is the combination seal, valve plate, and valve seat damage. Among them, damage to the combined seal and valve plate is more common. After the valve plate is damaged, the damaged valve plate cannot be directly replaced due to the current technology of replacing the valve plate without pressure, so the entire valve can only be replaced.

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