粉煤灰降失水水泥浆在天然气井固井中的研究与应用

Research and Application of the Fly Ash as a Fluid Loss Reducer in Natural Gas Well Cementing

长庆天然气田属于低压、低渗透气田,存在承压能力较低的地层,固井设计要求全井段封固,并且采用双级双凝施工工艺。但由于用于低密度水泥浆中的漂珠生产量降低,价格上升,研究应用替代产品是固井技术发展的方向。在一级领浆中研究应用了粉煤灰水泥浆体系,其性能和固井质量可完全满足固井要求。粉煤灰水泥浆体系价格低和固井质量优良,使其成为漂珠水泥浆体系的替代配方。

The reservoir in Changqing Oilfield is low-pressure low permeability in nature. Wells with weak formation in a certain section is required to be cemented from the bottom to the surface, and a two-stage cementing, separable setting cement slurry technology should be used. A substitute for hollow micro-spheres is expected to satisfy the need for oil and gas well cementing because of the recent decrease in production of the hollow micro-spheres (and hence a high cost). In our research, cement slurry containing...