Mining method for maximum reservoir contact well and maximum reservoir contact well structure

Abstract

The invention provides a mining method for the maximum reservoir contact (MRC) well, wherein the well structure comprises straight wells, horizontal wells, high-inclination horizontal wells and herringbone wells; the straight wells are communicated with the high-inclination horizontal wells and the herringbone wells; the high-inclination horizontal wells run through cracks indifferent layers; a plurality of high-inclination horizontal wells and horizontal wells, which are in layered arrangement, are both arranged in massive or thick layer-typed reservoirs, and multiple rows of horizontal wells or high-inclination horizontal wells are arranged in each layer, well planes of the horizontal wells or high-inclination horizontal wells in adjacent rows are in parallel and staggered arrangement, and the horizontal wells or high-inclination horizontal wells in adjacent layers are in vertical and staggered arrangement; a plurality of herringbone wells are arranged in the bottom layer of reservoirs, and also arranged in rows on the plane, and planes of the wells in adjacent rows are in parallel and staggered arrangement and are all on the same plane; and a plurality of high-inclination horizontal wells and herringbone wells form a vertical well network structure of planar crossing and vertical lamination and crossing. The technical scheme solves the problems of common low well yield, quick decrease and undesirable exploitation effect existing in the prior art due to the fact that most reservoirs are exploited by straight wells.

Description

technical field [0001] The invention belongs to the field of reservoir development, and relates to the development of massive or thick-layered reservoirs, in particular to a combined technology of maximum reservoir contact (MRC (Maximum Reservoir Contact)) well type suitable for the development of massive reservoirs, specifically It is a maximum reservoir contact (MRC) well type production method and its well type structure. Background technique [0002] As the main well type for reservoir development, vertical wells are widely used in various reservoirs. It has the advantages of understanding and controlling reservoirs, reducing deployment risks, short drilling cycle, and easy operation and adjustment. At the same time, it can be used for early test of water injection and oil recovery in later stage. Vertical well development is adopted in the early reservoir exploration stage and reservoir evaluation stage. The well layout mainly considers the planar well pattern design,...

AI Technical Summary

Problems solved by technology

However, this kind of well pattern design has the following defects for the multi-layer production of massive oil reservoirs: compared with the horizontal well pattern, the vertical difference of the reservoir leads to low producing degree of oil layers, and the number of wells required is large; the initial production of oil wells is low, Moreover, the production decline is fast; the production establishment speed of the reservoir is slow; the oil recovery speed is low and the water injection effect is poor, etc.

[0005] However, since the current well-type optimization design is limited to a single-type study in the plane two-dimensional space in the same reservoir, there is no precedent for multi-well-type space optimization and arrangement. Vertical wells, single horizontal wells or fishbone wells have been It is difficult to solve the practical problems of massive oil reservoir development. How to use multi-well type matching and spatial distribution of three-dimensional well pattern structure to develop oil reservoirs reasonably and effectively needs to be solved urgently

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