Exploration and application of “Well Plant” mode in Daniudi Gas Field

Daniudi Gas Field is a typical low-porosity, low pressure and low permeability gas filed. To improve the output of single well, shorten the construction period of single well, and reduce the costs of single well drilling, reconstruction of reservoir, and management of oil gas production, the exploration and application of “well plant” development mode was performed in 2012. The research was carried out in the overall deployment method of geology and engineering. The well group is located in favorable areas with wide area of horizontal expansion of sand body and relatively thick sand body in geological prediction. The well group is completely composed of horizontal wells, which can be divided into double-well type, four-well type and six-well type. For the well bore trajectory, three-dimensional trajectory shall not be designed as much as possible. The synchronous reservoir fracturing improvement shall be performed for the well group. The on-site application shows that the average construction period of horizontal single well in “well plant” mode is shortened by 20.11%, the average completion period is reduced by 23.85%, the average rate of penetration is increased by 29.08%; and the average relocation period of well group is shortened by 50.46%. Application of “well plant” mode for 2012 saved the area of acquired land of 381 mu and saved directly the investment of RMB 33.03 million. The development of “well plant” mode further promoted and applied in Daniudi Gas Field can provide guidance and draw on the experience.