Method for relieving water blocking at high temperature in oil and gas exploitation process

Abstract

The invention discloses a method for relieving water blocking at a high temperature in the oil and gas exploitation process. According to the method, an electrical heating rod is lowered into a reservoir stratum segment and is heated to a certain temperature, heat is transferred into a formation water blocking area through a casing pipe and a cement sheath, formation fluid in gaps is heated to evaporate and flow into a shaft, and then damages caused by water blocking can be avoided. The diameter of the electrical heating rod is 4 / 5 the inner diameter of the casing pipe of the reservoir stratum segment; the length of the electrical heating rod should be equal to the thickness of the reservoir stratum segment, and the electrical heating rod can be formed by connecting a plurality of fixed-length heating rods in series; the electrical heating rod should be parallel to the reservoir stratum segment when lowered into the reservoir stratum segment; the heating temperature of the electrical heating rod ranges from 300 DEG C to 600 DEG C, and the heating time is estimated. Principles are reliable, and the method is easy and convenient to implement, capable of effectively solving the problem of formation water blocking and suitable for barefoot well completion as well as cased hole completion and has broad application prospects.

Description

technical field [0001] The invention relates to a method for releasing formation water lock in the field of oil and gas exploitation, which can effectively improve the recovery rate. Background technique [0002] In the process of drilling, well completion, workover and production operations, in many cases, the phenomenon of foreign fluids staying in porous media is called water lock phenomenon. The water locking phenomenon will cause the increase of water saturation near the wellbore or the increase of the saturation of the original immiscible phase in the porous medium, the increase of the capillary resistance of the oil-water interface in the rock pores, and the Jamin effect, so that the crude oil in the formation is more productive than normal. In this state, an additional flow resistance will be generated, which will damage the relative permeability of oil and gas. Macroscopically, the crude oil production of oil wells will decrease, which will hinder oil and gas exploi...

AI Technical Summary

Problems solved by technology

However, none of them involve the method of using high temperature evaporation

[0004] Compared with the patent CN102536165A "method and device for removing water lock damage in low-permeability tight sandstone gas layers", microwave heating is characterized by strong microwave penetration ability and deep heating depth, but requires large power, and it can be used in a small underground space. , it is difficult to enter the high-power microwave generating device, so it has great limitations

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