Abstract
As tight oil serves as a critical direction for increasing reserves and production of unconventional oil and gas resources in China, its high costs and complex economics have become key constraints for large-scale development. Focusing on the optimization of design parameters and the collaborative evaluation of economic benefits for tight oil horizontal wells in the Longhupao Block of the Daqing Oilfield, this study constructs a techno-economic integrated evaluation model encompassing casing programs, platform scale, and horizontal section length based on extensive field measurement and supervision data. Utilizing methods such as least squares regression, nonlinear fitting, and incremental analysis, the coupling relationship between cost and production, as well as the threshold characteristics of economies of scale, is revealed. The results indicate that simplifying the casing program significantly improves drilling and completion efficiency while reducing the cost per foot. Furthermore, a clear boundary for economies of scale exists in platform “factory” operations; once the number of wells per platform exceeds a critical value, the increase in marginal costs offsets the scale benefits. Additionally, the relationship between horizontal section length and production is significantly nonlinear, with an optimal interval existing for comprehensive economic benefits. Consequently, an optimized development mode for tight oil horizontal wells characterized by “large platforms, simplified structures, and moderate horizontal sections” is proposed. This study provides scientific and quantitative decision support for the selection of design parameters and economic evaluation of unconventional horizontal wells, demonstrating significant value for widespread application.
