Imitation horizontal well waterflooding well pattern adapting method

Abstract

The invention provides an imitation horizontal well waterflooding well pattern adapting method which comprises the steps that the optimal well pattern form is obtained through a numerical reservoir simulation method, and models with different included angles between fissures and a well array are established for simulation and prediction; the array spacing of the optimal well pattern form under different permeability conditions is optimized, and the optimal well array spacing is obtained under different permeability range conditions; the reasonable well pattern density is determined, the economical and reasonable well spacing is calculated, the well spacing is determined accordingly, and the fissures are made to adapt to the well spacing; numerical simulation is conducted, and the optimal fissure construction parameters matched with different matrix permeability, and the optimal injection-production parameters are obtained; and the technology for adaption of the well pattern, the fissures and water injection during waterflooding of the low-permeability reservoir imitation horizontal wells is formed. By adoption of the imitation horizontal well waterflooding well pattern adapting method, the optimal configuration for the imitation horizontal well injection-production well pattern, the artificial fissures and a working system is achieved, a technical guarantee can be provided for effective production and efficient development of low-permeability low-abundance reservoirs, and the imitation horizontal well waterflooding well pattern adapting method has wide popularization prospects.

Description

technical field [0001] The invention relates to the field of fracturing water injection development of low permeability oil reservoirs, in particular to an adaptation technology of well pattern, fractures and water injection during water injection development of imitation horizontal wells (directional long fractures) in low permeability oil reservoirs. Background technique [0002] For low-abundance and low-permeability reservoirs, due to deep burial, low abundance, and poor physical properties, small well spacing can be used for water injection to improve recovery, but the investment is high and economic benefits are poor; large well spacing development cannot implement water injection and flexible development , the recovery rate is low, and the economic benefit is poor. In response to the demand for enhanced recovery and efficient development of low-permeability reservoirs, through the transformation of development concepts, the organic combination of reservoir engineering...

AI Technical Summary

Problems solved by technology

Since the imitation horizontal well water injection development technology has no precedent at home and abroad, the optimal design method of conventional low-permeability reservoir well pattern was adopted in the early stage, resulting in serious water channeling, which restricted the popularization and application of this technology

[0003] The seepage mechanism of imitation horizontal well development in low-permeability reservoirs is complex. In addition to the high requirements for fracturing technology, the matching relationship between well pattern and fracture, and the matching relationship between well pattern and water injection method need to be further studied

Images