Combination of Vertical Well Volume Fracturing and Linear Water Injection to Develop Ultra-Low Permeability Reservoirs

Abstract

The invention relates to a method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding. The method at least comprises the following steps that 1, a rectangular five-spot flood system is formed, oil production lines and water injection lines are formed in the rectangular five-spot flood system, the oil production lines and the water injection lines are mutually parallel and arranged in a staggered mode, and the extension direction of the oil production lines and the water injection lines is parallel to the maximum parallel principal stress direction; 2, volume fracturing is conducted on production wells and water injection wells in sequence, injection of flow lines between the oil production lines and the water injection lines is made to form a straight line on a horizontal plane. The flow lines are water flooding flow lines, namely, water flooding channels, formed between the water injection lines and the oil production lines. According to the method, an efficient driving system is established between the water injection lines and the oil production lines, the water injection capacity is enhanced, the oil well single well yield is greatly increased, and the oil production rate and the final water flooding recovery efficiency are increased.

Description

technical field [0001] The invention relates to a development method of an ultra-low permeability oil reservoir, in particular to a method for developing an ultra-low permeability oil reservoir by combining vertical well volume fracturing and linear water injection. Background technique [0002] Ultra-low permeability reservoirs refer to reservoirs with surface air permeability less than 1.0mD. With the decrease in the number of newly discovered medium and high permeability reservoirs (surface air permeability greater than 50mD), ultra-low permeability reservoirs have gradually become the main oil and gas resources. Due to the characteristics of ultra-low permeability reservoirs such as low porosity, low permeability, small pore throats, and difficult displacement, such reservoirs are difficult to develop, difficult to replenish energy, low production degree, and poor economic benefits. At present, the development of ultra-low permeability reservoirs generally adopts the ve...

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Problems solved by technology

Han Dejin et al. (Study on Adjustment Technology of Water Injection Development in Peripheral Low Permeability Reservoirs of Daqing. Journal of Petroleum Science, 2007, 28(1):83-87) disclosed that the reverse nine-point well pattern infill with fractured and low permeability was adjusted to a straight line Research on water injection methods (see Image 6 ), because the artificial fracturing method is conventional fracturing, the scale is relatively small, the fracture is single and no network is formed, so the streamline between the water injection well and the oil production well is basically similar to the "spindle shape". In this production method, water injection in a straight line The disadvantages of this method are that the single well production of oil wells is not high, it is difficult to establish an effective drive system for water injection wells and side wells, the degree of water flooding control is not high, the volume of water injection sweep is low, the oil recovery rate is low, and the ultimate recovery factor is low

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