Well mouth protection device capable of circulating well killing

Abstract

The invention discloses a well mouth protection device capable of circulating well killing, and the device comprises an antitheft protection cover with the opened bottom end. The top of an outer sidewall of the antitheft protection cover is provided with two cover lifting handles in a manner of left-right symmetry. The interior of the antitheft protection cover is provided with a short section pipe, and the central part of the short section pipe is in series connection with a high-pressure valve. The top of the short section pipe is provided with a hoop head, and an outer side wall, located below the high-pressure valve, of the short section pipe is provided with a pressure meter and a pressure releasing safety valve. The outer side wall of the bottom end of the short section pipe is connected with a suspension flange, and the suspension flange is located at the lower part in the antitheft protection cover. The antitheft protection cover is provided with an antitheft lock which can enable the suspension flange and the antitheft protection cover to be locked together. The objective of the invention lies in providing the well mouth protection device capable of circulating well killing, which can prevent the underground pressure of a waste well, a long-closed well and a to-be-processed well from rising to a blowout pressure value which is out of control, avoids the accidental blowout of the waste well, the long-closed well and the to-be-processed well, prevents the accidental blowout from endangering the nearby persons, and avoids the severe environmental pollution caused bythe above.

Description

technical field [0001] The invention relates to a well head protection device capable of circulating well killing. Background technique [0002] There are tens of thousands of oil wells in the oil field, among which there will be a large number of abandoned wells, wells that have been shut down for a long time, and wells to be treated. These oil wells are scattered between cities and countryside, with a large number and wide distribution. The downhole of wells shut down for a long time and to be treated will rise to a pressure value that may cause an out-of-control blowout. If it is not treated in time, it will endanger the safety of personnel near the wellhead and cause serious environmental pollution. [0003] In addition, wellhead theft incidents often occur in oil fields, especially abandoned wells, wells that have been shut down for a long time, and wells to be treated. Because these wells have not been used for a long time, the crosses, valves, well covers, clamps, bol...

AI Technical Summary

Problems solved by technology

[0002] There are tens of thousands of oil wells in the oil field, among which there will be a large number of abandoned wells, wells that have been shut down for a long time, and wells to be treated. These oil wells are scattered between cities and countryside, with a large number and wide distribution. The downhole of long-term shutdown wells and wells to be treated will rise to a pressure value that may cause an out-of-control blowout. If it is not treated in time, it will endanger the safety of personnel near the wellhead and cause serious environmental pollution.

[0003] In addition, wellhead theft incidents often occur in oil fields, especially abandoned wells, wells that have been shut down for a long time, and wells to be treated. Because these wells have not been used for a long time, the crosses, valves, well covers, clamps, bolts, etc. on the wellheads are easily stolen

Once these wellhead devices are stolen, the wellhead will be open and left unattended for a long time, which will easily cause foreign objects to fall into the well, completely abolishing the oil well, and thus causing great losses

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