Continuous heat insulating oil pipe and manufacturing method thereof

Abstract

The invention discloses a continuous heat insulating oil pipe and a manufacturing method thereof. The continuous heat insulating oil pipe comprises an inner pipe (1), an outer pipe (2) and a heat insulating and heat preserving layer (3), wherein both the inner pipe (1) and the outer pipe (2) are entire continuous oil pipes; a heat reflecting and heat insulating coating (4) is sprayed on the outer wall of the inner pipe (1), and is coated with the heat insulating and heat preserving layer (3); the outer pipe (2) is sleeved on the inner pipe (1), and can be wound on a winding drum III (7); positioning rings (5) are uniformly distributed on the outer wall of the inner pipe (1); the two ports of the outer pipe (2) are welded and sealed with the outer walls of the two ports of the inner pipe (1) respectively; and an annular space (6) is formed between the inner pipe (1) and the outer pipe (2). During operation, threaded connection is not required, so that the service life of the heat insulating oil pipe is prolonged, the operating efficiency is increased, and higher economic benefit is created.

Description

technical field [0001] The invention belongs to the technical field of oil production in oilfields, and in particular relates to a continuous heat-insulated oil pipe with a single length exceeding 61m and a manufacturing method thereof. Background technique [0002] In oil extraction, for heavy oil with high viscosity, it is generally necessary to inject water vapor at about 300°C downhole, and after high-temperature soaking, the viscosity of the heavy oil is reduced before oil recovery. Insulated tubing is an important piece of equipment in the steam injection thermal recovery process, and its structure is an insulated tubing column filled with insulating material or inert gas in the annular space of the double-layer concentric tubing. Conventional heat-insulating oil pipes are composed of outer pipes, inner pipes, heat-insulating materials, couplings, sealing rings, etc., with a single length of 9m-10m, and are threaded during operation. The heat-insulating oil pipe conne...

AI Technical Summary

Problems solved by technology

The heat-insulated oil pipe connected by thread is not only cumbersome to operate during the lifting and lowering process, but also has a long working cycle

More importantly, the heat-insulated oil pipes connected by threads are easily affected by factors such as corrosion during operation, and fail at the joints; and the threads of the threaded connections will be subjected to different degrees of mechanical damage after several downholes, which will affect loading and unloading, thereby seriously affecting work efficiency

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