Automatic well mouth pressure relief device and method for overflow shut-in

Abstract

The invention discloses an automatic well mouth pressure relief device for overflow shut-in. The automatic well mouth pressure relief device for overflow shut-in comprises a main pressure relief pipe, a standby pressure relief pipe and a main flow pipe, wherein the inlet end A of a four-way pipe I (1) is connected with a second manual valve (5), a check valve (4) is connected onto the second manual valve (5), the main pressure relief pipe consists of a third manual valve (6), a target-shaped elbow A (7), a first overflow valve (8) and a target-shaped elbow B (9), the third manual valve (6), the target-shaped elbow A (7), the first overflow valve (8) and the target-shaped elbow B (9) are connected between the outlet end B of the four-way pipe I (1) and the inlet end B of a four-way pipe II (3), and the standby pressure relief pipe consists of a fourth manual valve (10), a target-shaped elbow C (11), a second overflow valve (12) and a target-shaped elbow D (13). The invention further discloses a pressure relief method. The automatic well mouth pressure relief device and method for overflow shut-in has the advantages of being compact in structure, high in reliability, simple in operation and high in pressure control accuracy and automation degree.

Description

technical field [0001] The invention relates to the technical field of wellhead devices for oil and gas drilling, in particular to an automatic wellhead pressure relief device for overflow shut-in and a method thereof. Background technique [0002] With the deepening of exploration and development of oil and gas resources, the oil and gas drilling and production process has become very complicated, which gradually increases the risks and pressures faced in the drilling and production process. During the drilling process, the bottom hole pressure is lower than the underlying pore pressure due to the low density of the drilling fluid or the abnormal formation encountered, especially when drilling into the gas layer, which will cause the gas in the formation to enter the wellbore. Since the formation pressure is greater than the wellbore pressure, the gas continuously pours into the wellbore to form a gas column. After a well kick is detected, close the blowout preventer. At ...

AI Technical Summary

Problems solved by technology

However, using manual methods to adjust the wellhead pressure requires constant attention to the wellhead casing pressure and standing pressure, and may lead to improper operation, which increases the probability of subsequent well killing failure and seriously affects the pressure bearing capacity of the wellhead device. At the same time, it poses a challenge to the safety of the whole process and also affects the accuracy

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