Heat insulation, heat preservation and testing integrated continuous oil pipe

Abstract

The invention discloses a heat insulation, heat preservation and testing integrated continuous oil pipe. The continuous oil pipe comprises an inner pipe and an outer pipe, wherein the inner pipe is nested in the outer pipe, and an annulus is formed between the inner pipe and the outer pipe. The outer wall of the inner pipe is sequentially wrapped with an aluminum foil reflecting layer, a first SiCaerogel heat insulation layer and a second SiC aerogel heat insulation layer from inside to outside. A pressure measuring pipe, a temperature measuring pipe and a guide pipe are arranged in the annulus. A sealing plug is arranged at the tail ends of the pressure measuring pipe, the temperature measuring pipe and the guide pipe. A sealing cavity is formed among the sealing plug, the inner pipe andthe outer pipe. An opening communicating with the sealing cavity is formed in the inner pipe, and a check valve is arranged at the opening. According to the heat insulation, heat preservation and testing integrated continuous oil pipe, changes of inner and outer temperature fields and pressure fields of the heat insulation oil pipe can be monitored in real time; and heat insulation can be realized to largest extent, and the heat loss along the path can be reduced. The continuous oil pipe has the advantages of being high in operation efficiency, high in heat insulation grade and the like, solves the problem about temperature and pressure monitoring of downhole fluid in steam injection and production processes, and can meet requirements of special operation of oil fields.

Description

technical field [0001] The invention relates to an integrated coiled tubing for heat insulation, heat preservation and testing, and relates to the technical fields of oil production, steam injection, testing and operation in oilfields. Background technique [0002] In the process of oil extraction, it is generally necessary to inject high-temperature thermal fluid downhole to achieve the purposes of heating the oil layer, cleaning the sand control pipe, unblocking the oil layer, and cleaning the pipe string. Traditionally, ordinary heat-insulated oil pipes (such as the Chinese invention patent application with publication number 103527105A) are generally used to inject steam to heat the oil layer and reduce the viscosity of heavy oil. The method has the following disadvantages and deficiencies: the front and rear ends of the heat-insulated oil pipe are not heat-insulated, and the heat loss is large; and the outer diameter of the coupling of the heat-insulated oil pipe is muc...

AI Technical Summary

Problems solved by technology

Traditionally, ordinary heat-insulated oil pipes (such as the Chinese invention patent application with publication number 103527105A) are generally used to inject steam to heat the oil layer and reduce the viscosity of heavy oil. The method has the following disadvantages and deficiencies: the front and rear ends of the heat-insulated oil pipe are not heat-insulated, and the heat loss is large; and the outer diameter of the coupling of the heat-insulated oil pipe is much larger than the body of the heat-insulated oil pipe. For example, the maximum outer diameter of the main body is 127mm, but the outer diameter of the matching coupling has reached Φ141.3mm, and there is not much room left in the Φ159.7mm casing, and it is impossible to measure the temperature and pressure outside the heat-insulated pipe; The rear thread will be mechanically damaged to varying degrees, which will affect the loading and unloading, thus seriously affecting the working efficiency

This invention patent proposes the use of coiled tubing for processing and manufacturing, which changes the traditional way of threaded connection of a single heat-insulated tubing and improves the efficiency of the operation, but it does not solve the problem of testing during the steam injection process. The steam injection test technology of the steel wire trip test instrument cannot test the temperature and pressure of steam injection in this coiled tubing, let alone realize the temperature measurement, pressure measurement inside and outside the steam injection string, and online data transmission

[0005] In addition, during the steam injection process of the traditional single heat-insulated oil pipe, if the inclination angle of the well is greater than 28°, the traditional method of testing the steel wire to hang the test instrument cannot realize the monitoring of the steam injection quality in the heat-insulated pipe, let alone the heat-insulated pipe. Monitoring of steam injection temperature and pressure between outer casing and casing

[0006] The above situation has seriously affected the detection and evaluation of the quality of steam injection in downhole thermal recovery, which has led to petroleum engineering technicians being unclear about the heat loss along the steam injection in such oil wells. Therefore, it is necessary to develop and design a thermal insulation, heat preservation and testing integrated Coiled Tubing

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