Heat preservation lining oil pipe

Abstract

The invention discloses a heat preservation lining oil pipe. Oil pipe external threads are arranged at the two ends of the oil pipe, an internal supplement pipe is arranged in the oil pipe, lower internal threads of a coupling are connected with upper external threads of the oil pipe, the connection position is kept sealed, oil pipe internal threads are arranged on the upper portion of the coupling, a heat preservation layer is arranged between the internal supplement pipe and the oil pipe, an upper sealing ring is installed on the upper portion of the internal supplement pipe and the upper portion of the oil pipe, the upper sealing ring fixes the upper portion of the inner supplement pipe on the upper portion of the oil pipe and prevents the upper portion of the inner supplement pipe from moving upwards, and a lower sealing ring is installed on the lower portion of the inner supplement pipe and the lower portion of the oil pipe and fixes the lower portion of the inner supplement pipe on the lower portion of the oil pipe and prevents the lower portion of the inner supplement pipe from moving downwards. The heat preservation layer can prevent heat loss of well fluid passing through the oil pipe, in the process that well fluid is lifted to the ground through the oil pipe, the temperature is not reduced, the viscosity is not increased, wax precipitation is avoided, the lining pipe is made of a high-density polyethylene material so that the oil pipe can be prevented from being abraded, the well fluid does not make contact with the inner wall of the oil pipe and the inner wall of the coupling, and the oil pipe and the coupling cannot be corroded.

Description

technical field [0001] The invention belongs to the technical field of oil production equipment in oilfields, and relates to an oil pipe lowered into a well, in particular to a heat-preserving lined oil pipe. Background technique [0002] In oil production in the oil field, the oil pipe is lowered in the casing, and the crude oil in the well is extracted to the ground through the oil pipe. The oil pipe used in the oil field is a metal pipe at present, and one end of the oil pipe is connected with a collar, and the other end of the oil pipe is an external thread. When in use, the lower end of one oil pipe is threadedly connected with the coupling of another oil pipe in turn to form a channel for crude oil to flow from the bottom of the well to the head of the well. At present, ordinary oil pipes do not have the function of heat preservation. The temperature of the wellbore varies with the depth of the formation, and the formation temperature will gradually decrease from deep...

AI Technical Summary

Problems solved by technology

However, the lined tubing has no thermal insulation effect, and cannot solve the problem that the crude oil in the tubing is gradually reduced by the temperature of the formation during the lifting process, the viscosity increases, and the problem of wax formation

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