Oil and gas exploitation method for increasing recovery ratio through artificial crack control reserves

Abstract

The invention provides an oil and gas exploitation method for increasing the recovery ratio through artificial crack control reserves. The method comprises the steps of arranging a horizontal well according to the stratum structure trend, distribution features of sand bodies, distribution of stress fields and the like of an area where a to-be-exploited oil deposit is located; adopting a segmentedand clustered perforation technology for perforating a casing pipe in the horizontal well; adopting a pressing crack mode of which the scale is larger than a preset scale for conducting capacity cracking transformation on the perforated horizontal well if the brittleness index of reservoir rocks of the area where the to-be-exploited oil deposit is located is larger than a preset index, the reservoir rocks have natural crack development, and the max-min primary stress difference is smaller than a preset stress value; adopting the horizontal well which is subjected to capacity cracking transformation for exploiting oil and gas. According to the embodiment, the mode of well control reserves is converted into the mode of crack control reserves, the contact area of a matrix and the cracks is increased, the distance of fluid in the matrix to flow to the cracks is reduced, the pressure difference for driving the fluid in the matrix to flow to the cracks is lowered, and the per-well yield andthe recovery ratio of oil and gas exploitation are increased.

Description

technical field [0001] The application belongs to the technical field of oil and gas extraction, and in particular relates to an oil and gas extraction method for artificial seam-controlled reserves and enhanced recovery. Background technique [0002] Existing technology In the exploration and development of oil and gas fields, the calculation of reserves is basically based on the well as a unit. According to the discovery of single well drilling and fracturing, combined with relevant geological parameters to calculate the oil and gas reserves, and based on the physical properties of the reservoir, the level of development technology, etc. Reserves are divided into controlled reserves, proven reserves, recoverable reserves, etc. Under the "well-controlled reserves" mode, the degree of oil and gas production in the reservoir matrix is ​​relatively low, and it is quite difficult to achieve effective production. Pervasively low recovery factors have been a problem in oilfield ...

AI Technical Summary

Problems solved by technology

[0003] The research on how to improve the recovery technology has been working hard on water flooding and three-stage recovery, but these technical means still have technical problems of low recovery in the development of unconventional oil and gas reservoirs

For the development of unconventional oil and gas resources, under the modern fracturing theory, the traditional "well-controlled reserves" model is no longer suitable for the development of this type of reservoirs

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