Adaptability Evaluation of Horizontal Well Development in Shenmu Multi-layer Tight Gas Reservoir

Abstract

Shenmu Gas Field is a multilayer tight sandstone gas reservoir with low vertical well production. The task of gas field productivity construction is heavy. It is an effective way to increase the production of a single well by excavating local superior areas and implementing horizontal well development. Therefore, it is necessary to evaluate the adaptability and establish the reservoir limits of horizontal well in Shenmu Gas Field. Systematically study the superposition mode and development scale of reservoir sand bodies, and use the reserve concentration to divide the multi-layer gas reservoirs into three types, and they are single-layer, double-layer and multi-layer, respectively. The numerical simulation method is used to compare the development effects of horizontal wells and vertical wells, to determine the reserves concentration limits and reserves physical property limits of horizontal well development. The selection criteria for geological targets suitable for horizontal well is established. The research shows that ① A large-scale composite effective reservoir is formed in the local area of the Taiyuan Formation and Shan2 Formation in Shenmu Gas Field, with a length of 1600–3200 m and a width of 800–2000 m, and it has the geological conditions for horizontal well development; ② the reserve concentration in the main development zone of the horizontal well should be over 75%, and it should have a continuous effective thickness of 5.0 m, The permeability ratio between the primary and the secondary layer should be between 0.8 and 3.9; ③ the Shenmu Gas Field is generally not suitable for large-scale horizontal well overall development, but is suitable for centralized development in local single-layer advantageous areas. The research result can provide technical support for the horizontal wells of similar gas reservoirs at home and abroad, and are of great significance for the efficient development of gas fields.KeywordsMulti-layer tight gas reservoirThe sand body superimposed modelHorizontal well development