Mineral insulation electric heating system for electric heating aided production of steam injection oil well

Abstract

The invention discloses a mineral insulation electric heating system for electric heating aided production of a steam injection oil well. The system comprises a 10-kv power supply, a step-down transformer, a power adjusting cabinet, a cable rotating disc, a heating element, a power cable and a Christmas tree. The system of the invention has the following beneficial effects: 1, the technical defects of auxiliary electric heating of a traditional heating element are effectively overcome, and innovations such as tape reel power connection, repeated tripping and temperature monitoring are realized; and 2, direct electric heating is performed in a high-temperature steam environment, and a heating cable is integrated with a temperature thermocouple to realize temperature monitoring of a heating section, so problems in the service life of a heating element material in a high-temperature environment of 300 DEG C or more is solved, and continuous operation of electric heating in a whole harvesting process period is realized.

Description

Technical field: [0001] The invention relates to the technical field of auxiliary electric heating systems for steam injection oil wells, in particular to a mineral insulated electric heating system for electric heating auxiliary production of steam injection oil wells. Background technique: [0002] At present, oil thermal recovery is mainly divided into steam huff and puff recovery and steam assisted gravity drainage (SAGD). Both steam thermal recovery technologies are cutting-edge technologies for the development of super heavy oil. The former is to inject steam into the borehole of the same oil layer and then recover; the latter is to be recovered by steam driving the viscosity-reducing flow in the upper layer of the oil layer to the lower layer of the pipe string. [0003] The oil layer depth of heavy oil and ultra-heavy oil is usually more than one thousand meters. The traditional electric heating element that can meet the length requirement is a heating cable insulate...

AI Technical Summary

Problems solved by technology

[0003] The oil layer depth of heavy oil and ultra-heavy oil is usually more than one thousand meters. The traditional electric heating element that can meet the length requirement is a heating cable insulated by organic polymer materials such as silicone rubber and fluoroplastics. Due to the resistance of organic polymer materials Limited by temperature, the maximum operating temperature allowed for long-term operation is below 200°C, which cannot meet the direct heating application of high-temperature steam environment (300°C), and the temperature measurement of the steam column requires a separate temperature measurement cable, only One column can be used for gas injection, and the next production column can be heated by electric heating in a non-steam environment, and the operating temperature is not high, which greatly reduces the effect

[0004] When the existing heating cable is connected with the power cable, it needs to be completely pulled off from the cable turntable, and then electrically connected to the head end. Due to the long length of the heating cable, each electrical connection is time-consuming and laborious, and the installation is very inconvenient.

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