A Prediction Model of Pressure Loss of Cement Slurry in Deep-Water HTHP Directional Wells

Abstract

The exploitations of deep-water wells often use directional well drilling to reach the target layer. Affected by special environments in deep water, the prediction of pressure loss of cement slurry is particularly important. This paper presents a prediction model of pressure loss suitable for deep-water directional wells. This model takes the complex interaction between the temperature, pressure and hydration kinetics of cement slurry into account. Based on the initial and boundary conditions, the finite difference method is used to discretize and calculate the model to ensure the stability and convergence of the result calculated by this model. Finally, the calculation equation of the model is used to predict the transient temperature and pressure loss of Wells X1 and X2, and a comparison is made between the predicted value and the monitoring data. The comparison results show that the maximum error between the temperature and pressure predicted by the model and the field measured value is within 6%. Thus, this model is of high accuracy and can meet the needs of site construction. It is concluded that this result can provide reliable theoretical guidance for temperature and pressure prediction, as well as the anti-channeling design of HTHP directional wells.

Analysis of the Weight Loss of High Temperature Cement Slurry

“…At the same time, in order to verify the reliability of the experiment, we use the existing mathematical model for calculation verification [19]. Based on the law of conservation of energy and the basic principles of hydrostatics, this model for calculating the pressure loss in waiting on cement (WOC) stage is derived in this research taking into comprehensive consideration the mutual action between the hydration reaction, temperature and pressure of cement slurry, as well as the complicated deep-water environment.…”

Study on preparation and properties of polyurethane modified epoxy resin lotion cementing slurry

“…have already become important energy reserve areas in China (Wang et al 2011, Wang et al 2009, Luo et al 2017, Bu et al 2020. However, the complexity of the deepwater environment, especially the brittle failure of the cement sheath and the sinking of the wellhead (Ravi et al 2009), has brought huge challenges to the exploration and production of deepwater resources (Lv et al 2021, Tian et al 2022, Zheng (2023). This is because the deep-water and shallow strata are very fragile and mostly composed of loose sandstone structures (Wang et al 2023), which can extend several hundred meters below the mud line, easily reducing the bonding quality between the cementing interface and the well.…”

A Comprehensive Method for the Optimization of Cement Slurry and to Avoid Air Channeling in High Temperature and High-Pressure Conditions

“…Annulus air channeling is defined as the phenomenon that gas intrudes into the annulus from formation pores and migrates to the wellhead due to the imbalance between annulus liquid column pressure and formation pressure after cementing [1], as shown in Fig. 1.…”