Practice and understanding of stereoscopic development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block

doi:10.3969/j.issn.1672-7703.2023.02.007

Abstract

Abstract: Since the large-scale development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block, there has been always problems such as low reserve production rate and low recovery factor caused by the development mode of large well spacing and single target layer, which also bring severe engineering risks for the later well pattern infill or adjustment. Therefore, pilot well group with small well spacing is deployed and implemented in Platform TYH11 for stereoscopic development of Taiyang Shallow Shale Gas Field. Based on hydraulic fracture simulation and production numerical simulation methods, the whole process evaluation of “pilot well deployment-drillingfracturing-production-production capacity” is conducted by applying geological, drilling, fracturing and production test data. The study results indicate that : (1) ClassⅠ+Ⅱ reservoir in first sub member of the first member of Longmaxi Formation (Long 11 sub member) in the Upper Ordovician Wufeng- Lower Silurian has conditions for high-yield production and basis for multi-target production in vertical; (2) The engineering technology series have been developed for the whole process of drilling, fracturing and well testing, which enable the successful implementation of stereoscopic development well groups with small well spacing; (3) The stereoscopic development mode with small well spacing supports to effectively increase the reserve production rate by 23.0% and the recovery factor by 11.0%; (4) The communication of natural fractures causes pressure channeling interference within the well group and with adjacent wells, which greatly impacts on the production of old wells; (5) The frac-hit is aggravated by the change of in-situ stress field around the adjacent old producing wells, so it is recommended to keep a well spacing of at least 380-500 m between the new well and the old well. The study results lay a foundation for the promotion and application, overall development plan design, development policy formulation, and large-scale and beneficial stereoscopic development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block.

CLC Number:

TE332

Huang Xiaoqing, He Yong, Cui Huan, Ji Yongcheng, Wang Xin, Han Yongsheng, Wang Congcong. Practice and understanding of stereoscopic development of Taiyang Shallow Shale Gas Field in Zhaotong demonstration block[J]. China Petroleum Exploration, 2023, 28(2): 70-80.

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