天然气作为一种清洁能源是实现碳达峰、碳中和的现实路径,加大天然气的开发利用必然要钻打更多的生产井,并将产出大量废弃泥浆和岩屑。以川渝地区为例,从承包商视角对水基钻井液钻井过程中产生的水基钻井岩屑的处理方案进行研究,以经济最优化为目标,对比分析固化混拌制砖工艺和破胶压滤制砖工艺两种水基钻井岩屑处理资源化方案的经济性。固化混拌制砖工艺中,破胶剂加入量为11 kg/m3,破胶处理后固化剂的加量优选为待处理水基钻井岩屑质量的10%;破胶压滤制砖工艺中,破胶剂加入量为19 kg/m3,在0.8 MPa压力下进行压滤。对固化混拌制砖工艺和破胶压滤制砖工艺两种方案进行主要成本计算结果表明,当承包商的工程处理量＞2 100 m3时,采用破胶压滤制砖工艺方案更具优势,反之固化混拌制砖工艺方案更优。

Natural gas, as a clean energy, is a practical way to achieve carbon peaking and carbon neutrality goals. Increasing the development and utilization of natural gas will inevitably require drilling more production wells, which will produce a large amount of waste mud and cuttings. Taking the Sichuan-Chongqing region as a case study, the treatment plan of the drill cuttings mixture produced during the drilling process utilising water-based drilling fluid was studied from the perspective of the contractor. With the objective of economic optimisation, the economics of two water-based drilling cutting treatment and recycling schemes (curing and mixing process and breaking gel filter press process for brick making) were compared and analyzed. In the curing and mixing process, the amount of gel breaker required is about 11 kg/m3, and the amount of curing agent is preferably 10% of the mass of water-based drilling cuttings to be treated. In the breaking gel filter press process, the dosage of gel breaker is 19 kg/m3, and the pressure filtration is carried out under a pressure of 0.8 MPa. The results of the main cost component calculations for the two processes show that when the contractors processing capacity is greater than 2100 m3, it is more favorable to use the breaking gel filter press brick making process; otherwise, it is better to adopt the curing and mixing brick making process.