Controlled impact wave based injection increase method of water injection well

Abstract

The invention provides a controlled impact wave based injection increase method of a water injection well. The method comprises the steps that according to the water injection condition of the water injection well, a reservoir segment where water cannot be injected or water injection lacks is confirmed, impact wave parameters needed for an acting reservoir are selected according to geological dataand water injection historical data of the water injection well, and the positions of operation points of impact operation of impact waves and the number of times of operation of each point are set;controlled impact wave generation equipment is lowered to the position of the bottommost operation point of the water injection well; starting from the position of the bottommost operation point of the water injection well, the controlled impact wave generation equipment is utilized for impacting on the position of every operation point, after operation at the position of each operation point is finished, the controlled impact wave generation equipment is raised, and the controlled impact wave generation equipment moves to the position of the next to-be-operated point to implement operation; and after operation of each operation point is finished by the controlled impact wave generation equipment, injection increase to the water injection well is finished through impact waves. By means ofthe method, the segmented, selective and repeated impact function can be implemented on target segments.

Description

technical field [0001] The invention belongs to the field of energy, and relates to a method for enhancing oil recovery, which is applied to increasing injection of water injection wells in oil fields. Background technique [0002] With the rapid development of the global economy and the rapid growth of energy demand, how to ensure the safe production of oil and gas has become a key challenge faced by governments and the oil industry. In the composition of my country's oil and gas production, the proportion of low-permeability oil and gas production is increasing year by year, and its position is becoming more and more important. By the end of 2008, the country's cumulative proven low-permeability petroleum geological reserves were 14.1 billion tons, accounting for 49.2% of the country's oil and gas reserves. In 2008, the national output of low-permeability crude oil was 71 million tons, accounting for 37.6% of the total output. Low-permeability oil and gas will be the mai...

AI Technical Summary

Problems solved by technology

The physical characteristics of ultra-low permeability reservoirs are as follows: small particles, high cement content, low surface porosity, fine pore throats, and poor physical properties; in traditional measures, it is more or less always necessary to inject exogenous substances into the reservoir, If the injection measures are not selected properly, it may cause secondary damage to the reservoir

In the practice of improving ultra-low permeability reservoirs, the effective period of conventional measures is generally short

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