Horizontal well spacing method based on sand body structure

Abstract

The invention provides a horizontal well spacing method based on a sand body structure. The method comprises the following steps of selecting a natural gamma ray curve of a layer section to be studied of a target region; classifying the sand body structure according to the curve form and the sand layer thickness; drawing a sand layer thickness isograms according to the sand body structure features, the sand body combination mode and the sand body thickness of a single well; determining a sand body well spacing range according to the oil layer thickness and the plane distribution features of the sand body; selecting different well networks according to the sand body structure; deploying a short-five-point well network for the single-layer stable type sand body; and deploying a long-five-point well network and a seven-point well network for the multilayer superimposed sand body. The horizontal well spacing method has the advantages that the horizontal well spacing can be performed on the basis of the sand body structure and sand body distribution rule study; the sand body structure is expressed by using the smooth degree of the natural gamma ray curves of well logging curve data; and the horizontal well five-point and seven-point water injection development well networks are deployed by combining the riverway sand body width.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for arranging horizontal wells based on sand body structure in lithologic reservoirs, in particular to a method for arranging horizontal wells based on sand body structure, which can improve the level and benefit of oilfield development. Background technique [0002] In lithologic reservoirs, the oil-gas reservoir sand body refers to the oil-bearing sand body in the underground reservoir, which is composed of many irregular sand bodies. It is the smallest oil-bearing unit in the underground oil layer and the most basic unit to control the movement of oil and water. . Under different depositional environment conditions, the sand body structure of the reservoir is quite different, and a good distinction of the difference in the sand body structure of the reservoir plays an important role in the well layout of horizontal wells. [0003] At present, in the fiel...

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Problems solved by technology

[0004] The existing horizontal well layout ideas mainly consider the relationship between the orientation of the horizontal section and the direction of the fracture, and the injection-production well pattern of the horizontal well.

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