Technology of replacing oil and gas wellhead gate valve under pressure
Technology Introduction
This technology has been applied on-site for nearly 2,000 well times, involving various oil and gas wellheads with complex geology, high pressure, high H2S, and high CO2 content.
This technology uses special tools to install at the wellhead, uses the hydraulic pressure generated by the hydraulic system to send the plug to a predetermined position, opens the plug rubber to seal the high-pressure oil and gas passage, and then performs gate valve operation. In the process of valve replacement, the plug is pressed by hydraulic pressure or a special fixture to ensure stable and reliable operation.
This technology is divided into single-layer or double-layer blockage. It belongs to the technology of valve replacement under pressure without losing hands. It is the technology of valve replacement under pressure specified in the CNPC "Youkan [2010] No. 80" document. The construction process is all in a controlled state, with the advantages of safe and reliable operation, environmental protection, no impact on output, and short construction time. It meets the requirements of "safety, environmental protection, and energy saving" for oil and gas field development, and is especially suitable for high pressure oil and gas wells with high output.
Technical advantages
1) No need to kill well
2) No external power equipment required
3) Replacing the valve is safe, reliable, fast and economical
4) The construction time does not exceed 6 hours, which has little impact on production
5) The main control gate valve and other parts can be replaced under high pressure under pressure
6) Only a small amount of gas is discharged in the tool, which does not pollute the environment, does not harm the gas layer, and does not pollute the formation
7) No impact on crude oil gas well production after construction
Technical parameters of constructable wellhead
Applicable pressure: ≤35MPa (5000Psi)
Iguchi Nominal diameter:φ52mm（
）、φ65 mm（
）、φ79 mm（
）、φ103 mm（
）
Comprehensive comparison of two methods for replacing gas production wellhead valves
Use conventional replacement methods | Use this device replacement method |
Need to kill well | No need to kill well |
Need large-scale equipment to cooperate with construction | No need for large-scale equipment to cooperate with construction |
Damage the atmosphere | Does not harm the atmosphere |
polluted environment | Does not pollute the environment |
