Full-metal seal dual-pipe steam injection well head device used for inclined shaft

Abstract

The invention discloses a full-metal seal dual-pipe steam injection well head device used for an inclined shaft, and relates to the technical field of oil exploitation. A production casing pipe is sleeved with a surface layer casing pipe, the top of the surface layer casing pipe is welded with a simple casing pipe head assembly, the top of the production casing pipe is welded with an oil pipe headfour-way assembly, a four-way inner cavity of the oil pipe head four-way assembly is provided with a main hanger, and a main hanging metal seal assembly, a main hanger inner cavity is provided with asub hanger and a sub hanger metal seal assembly, a first oil pipe and the main hanger are connected to the four-way inner cavity of the oil pipe head four-way assembly, the second oil pipe and the sub hanger are connected into the main hanger inner cavity, a steam injection tree assembly is arranged above the oil pipe head four-way assembly, metal seal rings are arranged in a top groove of the main hanger and a top groove of the sub hanger, the metal seal rings are connected with the bottom of a vertical channel of the steam injection tree assembly, and the main hanger and the sub hanger areprovided with automatic guide-right centering positioning structures, the dual-pipe steam injection function is achieved, and the seal effect under the inclining state is ensured.

Description

Technical field [0001] The present invention relates to the technical field of petroleum exploitation, in particular to an all-metal sealed double-tube steam injection wellhead device which can be used in inclined wells. Background technique [0002] In the process of horizontal well drilling in shallow oil reservoirs, due to the low vertical depth, deviated well drilling rigs are usually used in order to ensure the requirement of deflection. After this technology is mined, the well casing and the ground are inclined. [0003] Inclined drilling technology is widely used in the Canadian oil sands extraction process, and the completion string forms an angle of 45° with the ground. Due to the small axial force and the influence of radial force on the seal assembly under this special working condition, it is quite different from conventional vertical wells. The sealing technology used in conventional vertical wells is difficult to ensure the sealing effect, and the inclined operation ...

AI Technical Summary

Problems solved by technology

Due to the small axial force and the influence of radial force on the sealing assembly under this special working condition, it is quite different from conventional vertical wells. The sealing technology used in conventional vertical wells is difficult to guarantee the sealing effect, and the inclined operation method is also easy Cause seal damage leading to seal failure

Images