A staggered well layout method for quasi-natural energy development of volume-fractured horizontal wells in ultra-low permeability tight oil reservoirs

Abstract

The invention provides a staggered well arranging method for ultra-low permeability tight oil reservoir volume fracturing horizontal well quasi-natural energy exploitation. The method comprises the steps of 1) firstly carrying out comprehensive geological research, selecting a horizontal well network deployment area preferably, carrying out reservoir classification evaluation, and determining a main contribution interval; 2) optimizing the horizontal segment length; 3) optimizing the well spacing; 4) optimizing the segment distance between fracturing fractures; 5) determining the array distance. The method can utilize the natural energy oil drainage function of horizontal well volume fracturing fracture networks to the greatest degree and avoids the risk of water breakthrough in water flooding exploitation; volume fracturing retention fluid achieves the effects of replenishing energy at an early stage.

Description

technical field [0001] The invention relates to the technical field of oilfield development methods, in particular to a method for developing oilfields in tight oil reservoirs using horizontal wells, in particular to a staggered well layout method for volumetric fracturing horizontal wells in ultra-low permeability tight oil reservoirs for quasi-natural energy development, which is an improved The development method of oilfield single well production and development benefit. Background technique [0002] With the increasingly prominent contradiction between the world's oil supply and demand and the gradual shortage of high-quality oil resources, the development of ultra-low permeability tight oil resources (surface air permeability is less than 1.0mD) has become a new topic for the development of my country's oil industry. Practice has shown that horizontal wells are an effective way to develop this type of reservoir. The formation pressure coefficient of foreign tight oil r...

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Problems solved by technology

[0003] Judging from the literature research, the energy supplement of horizontal wells in ultra-low permeability tight reservoirs is supplemented by water injection from water injection wells. The scale of fracture stimulation is large, and the distribution of fracturing fracture network is complex, which may easily lead to water breakthrough in horizontal wells for water injection development

The complex fracture network system formed by the volume fracturing of tight oil is conducive to expanding the drainage volume, replenishing formation energy, increasing single well productivity, and maintaining stable production of horizontal wells on the one hand; The distribution of fracture network is complex, which can easily lead to water breakthrough in horizontal wells for water injection development, which makes it more difficult to match the well pattern and fracture network

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