考虑经济成本下的川南深层页岩气井距优化

Optimization of Spacing for Deep Shale Gas Wells in Southern Sichuan Considering Economic Cost

摘要: 深层页岩气是页岩气勘探开发重要的战略接替领域，设计并优化井距获取最大经济效益，对其勘探开发具有十分重要的指导意义。基于经济效益优化水平井压裂关键参数，为井距优化设计提供设计基础。通过数值模拟方法，采用正交试验方法对水力压裂缝参数研究，确定单一裂缝参数最优参数范围，获得变水力裂缝参数设计最优方案。研究结果如下：(1) 结合经济净现值，通过数值模拟的方法优化水平井距参数，得到该区块最优井距为300米；(2) 基于水平井距300米的开发方案，得到最优裂缝参数为：采取交叉式布缝，半缝长155米，缝高为55 m，裂缝导流能力为0.2 D∙cm；(3) 基于该区块裂缝参数优化模拟结果，推测层厚较薄、区块范围较广的深层页岩气区块，可以考虑适当牺牲缝高参数条件获取更长的半缝长参数，获取更高产量和经济效益。

Abstract: Deep shale gas is an important strategic replacement field for shale gas exploration and development. Designing and optimizing well spacing to obtain maximum economic benefits is of great guiding significance for its exploration and development. Based on the economic benefits, the key parameters of horizontal well fracturing are optimized, which provides the design basis for the optimization design of well spacing. Through the numerical simulation method, the orthogonal test method is used to study the hydraulic fracture parameters, determine the optimal parameter range of single fracture parameters, and obtain the optimal design scheme of variable hydraulic fracture parameters. The research results are as follows : (1) Combined with the economic net present value, the horizontal well spacing parameters are optimized by numerical simulation, and the optimal well spacing in this block is 300 meters; (2) Based on the development plan of 300 m horizontal well spacing, the optimal fracture parameters are obtained as follows: cross-type fracture arrangement, half-fracture length of 155 m, fracture height of 55 m, fracture conductivity of 0.2 mD·cm; (3) Based on the simulation results of fracture parameters optimization in this block, it is inferred that for deep shale gas blocks with thin layer thickness and wide block range, longer half-length parameters can be obtained by appropriately sacrificing fracture height parameters, so as to obtain higher production and economic benefits.