A coordinated control method of slurry density and material level to improve cementing quality

Abstract

Abstract During the cementing stage, it is necessary to strictly control the density of the slurry injecting well to form cement sheath with good interlayer sealing capacity. However, due to the influence of factors such as unstable ash supply and coupling of operating parameters, problems such as unstable cement slurry density control and serious deviation from process design values often occur, which seriously limit the improvement of cementing efficiency and quality. In order to solve this problem, this paper proposes a coordinated control method of slurry density and level by combining feedforward-cascade control and split range control, to strengthen the collaborative linkage between the operating parameters of cement supply, liquid supply, slurry mixing and pump injection, and improve the quality of cement slurry density control. Finally, the proposed control method is verified by the test platform built for the actual cementing operation scenario. The test results show that the proposed method can achieve stable and accurate control of cement slurry density and effectively guarantee the safety and quality of cementing operation.