Understanding and thinking of gas production profile characteristics in Daniudi gas field

Daniudi gas field is a typical tight sandstone gas reservoir with low porosity and extra low permeability and seven sets of gas layers developed from top to bottom. Before 2012, the vertical well development was adopted and followed by the horizontal well development. In order to further define the gasproducing characteristics of each member in different stages of horizontal wells, the fracturing technology and reasonable production system were continuously optimized, some representative vertical wells and horizontal wells were selected to carry out gas-producing profile test. The results show that gas well production is a dynamic process of producing and developing successively. After a certain period of time, the main stratum will change, and permeability, total hydrocarbon content and geological reserves are the main factors affecting the change. In the horizontal well production process, the contribution rate of each member is inconsistent. It is suggested to select a new horizontal well within 90 d of production and 180 ～ 200 d of production, and then test it once a year, so as to clarify the production rule of the whole life cycle of horizontal wells.