Large area tight gas reservoir mining method

Abstract

The invention provides a large-area tight gas reservoir exploitation method. The large-area tight gas reservoir exploitation method comprises the following steps that a relative enrichment region is selected, the production building region gas bearing area and the proven geological reserve in the relative enrichment region are determined, the production building region gas bearing area is the area of a deployable well location, and then the production building region area of horizontal wells and the production building region area of vertical wells are determined according to geological and seismic data; the vertical well indexes and the horizontal well indexes are determined; the well pattern and well spacing of the vertical wells and the well pattern and well spacing of the horizontal wells are determined; the well number limit of the horizontal wells and the vertical wells is determined according to the well pattern and well spacing, the production building region area of the vertical wells and the production building region area of the horizontal wells; gas reservoir exploitation of the relative enrichment region comprises a gas reservoir production building period, a gas reservoir stable production period and a gas reservoir decline period, and the gas reservoir exploitation indexes are determined. The method is suitable for a large-area tight gas reservoir, the exploitation efficacy is improved, and the recovery rate is increased while the good exploitation benefit is achieved.

Description

technical field [0001] The invention belongs to the field of oil and gas exploitation, in particular to a method for exploiting large-area tight gas reservoirs. Background technique [0002] Tight gas reservoirs refer to natural gas reservoirs in sandstone formations with permeability less than 0.1 millidarcy (mD). Large-area tight gas reservoirs usually refer to tight gas reservoirs with an area larger than 1000 square kilometers that are different from conventional gas reservoirs. As an important natural gas resource, tight gas reservoirs have gradually become the main growth point of natural gas production. For conventional gas reservoir mining methods, the production block is determined by the gas reservoir boundary; gas well productivity is determined for each well; because the reservoir is relatively homogeneous and well connected, there is generally no concept of well pattern, and the well The interval is generally determined according to the production scale, the n...

AI Technical Summary

Problems solved by technology

However, large-area tight gas reservoirs have strong heterogeneity, large differences in gas well index parameters, and a large number of gas wells. If the conventional gas reservoir mining method is adopted, the production index will inevitably be uncertain, and the production efficiency cannot be improved.

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