Sealing device of casing pipe suspension device

Abstract

The invention discloses a sealing device of a casing pipe suspension device. The sealing device is arranged between a casing pipe head and a casing pipe body and located above the casing pipe suspension device. The sealing device comprises an annular fixing piece (1). An outer sealing ring (2) is arranged on the outer wall of the annular fixing piece in a sleeving mode, and the outer wall of the annular fixing piece makes contact with the outer wall of the casing pipe head through the outer sealing ring (2). An inner sealing ring (3) is arranged on the inner wall of the annular fixing piece, and the inner wall of the annular fixing piece makes contact with the inner wall of the casing pipe body through the inner sealing ring (3). Sealing of the casing pipe body and the casing pipe head is achieved through the inner sealing ring and the outer sealing ring of the annular fixing piece. By means of the sealing device of the casing pipe suspension device, the purpose that the upper space of the suspension device is sealed can be achieved, and the effect that a flange primary seal passes the pressure test during later operation is ensured; and the well-killing operation and wellhead flame operation links are reduced, the labor intensity is relieved, the labor cost is reduced, the production limitation period is prolonged, and the safety coefficient is increased.

Description

technical field [0001] The invention relates to an oil well device, in particular to a casing hanger sealing device. Background technique [0002] With the deepening of oilfield development, the natural energy of oil wells attenuates, and the number of wells supplementing formation energy by water injection and gas injection gradually increases. The problems of unevenness and unqualified pressure test are gradually exposed. [0003] In the early stage of wellhead replacement operation, due to the unevenness of the casing hanger of some oil wells during drilling, the stress on the casing hanger was uneven, resulting in the deformation of the sealing rubber of the casing hanger, and the seal of the hanger was not tight; The pressure test of the main seal of the backing flange was unqualified, posing a great risk of well control. It has been found in the oil field that the main seal of some well flanges fails to pass the pressure test. If the overhaul operation such as replac...

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Problems solved by technology

[0003] In the early stage of wellhead replacement operation, due to the unevenness of the casing hanger of some oil wells during drilling, the stress on the casing hanger was uneven, resulting in the deformation of the sealing rubber of the casing hanger, and the seal of the hanger was not tight; The pressure test of the main seal of the backing flange failed to pass the pressure test, and there is a great risk of well control

It has been found in the oil field that the main seal pressure test of some well flanges is unqualified. If the overhaul operation such as replacing the casing hanger is directly carried out, the operation cycle will be long, the cost will be high, and the production timeliness will be affected.

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