Sand washing concentric tube for low-pressure absorption well and assembling method of sand washing concentric tube

Abstract

The invention provides a sand washing concentric tube for a low-pressure absorption well and an assembling method of the sand washing concentric tube. A tubular column comprises an inner sand washing tube body and an outer sand washing tube body, and the inner sand washing tube body is placed in the outer sand washing tube body; an annular cavity is formed between the inner sand washing tube body and the outer sand washing tube body in a distance manner; the upper end of the outer sand washing tube body is fixedly sleeved with a special-shaped coupling, and a penetrating hole is formed in an upper sealing joint; the upper sealing joint is fixedly sleeved with the upper end of the inner sand washing tube body through the penetrating hole; a plurality of protruding ribs are arranged on the outer wall of the upper sealing joint at intervals, extend to the inner wall face of the special-shaped coupling in the radial direction and are fixedly connected with the special-shaped coupling; and the inner sand washing tube body and the outer sand washing tube body are connected into a whole through the special-shaped coupling and the upper sealing joint. The sand washing concentric tube can carry out sand washing work simply, conveniently, safely and efficiently.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a sand flushing concentric pipe and an assembly method thereof required in the sand flushing process of a sand flushing loss well with a low reservoir pressure coefficient. Background technique [0002] In sandstone reservoirs, sand production in oil and water wells is a common phenomenon, and the degree of sand production is affected by many factors such as reservoir physical properties, particle cementation status, and water injection intensity. [0003] With the development of oilfields, most old oilfields in China have entered the middle and late stage of oilfield development. The main production intervals have long water injection time and high water injection intensity, and sand production is becoming more and more serious. At the same time, there are different degrees of under-injection, resulting in reservoir pressure. The coefficient is low, which leads to...

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Problems solved by technology

However, the processing technology of the existing sand washing concentric pipes is difficult, the assembly is relatively complicated, the technology is unreliable, and standard oil pipes cannot be used, and conventional sand washing equipment (minor repair equipment) cannot be used for on-site construction

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