Performance Experiment of Ultra high Temperature Cementing Slurry System

Abstract The continuous development of oil and gas exploration and development to deep and ultra deep wells in China, the formation temperature is also getting higher and higher, which has brought huge problems to the drilling and completion work. When the formation temperature is higher than 180 ℃, the cementing operation is defined as ultra-high temperature cementing. The working condition of ultra-high temperature cementing is complex, which puts forward higher requirements for the performance of cementing cement slurry. Cementing cement slurry should not only meet the requirements of high temperature thickening time, but also maintain a certain slurry stability and mechanical strength under high temperature conditions to improve the cementing quality. With the increasing number of ultra deep wells and ultra-high temperature wells, ultra-high temperature has put forward higher requirements for the temperature resistance of cement slurry. In order to solve this problem, based on the requirements of ultra-high temperature cementing operation on the performance of cement slurry, this paper configures high-temperature resistant fluid loss reducer DRF-1S, high-temperature resistant retarder DRH-2L and other supporting high-temperature resistant cement additives to form ultra-high temperature conventional density cement slurry, and carries out indoor test research to evaluate the settlement stability, water loss performance, thickening performance and mechanical performance of ultra-high temperature cement slurry, An ultra-high temperature cementing slurry system is established for oil and gas well cementing. The research results show that: based on the design idea of high temperature cement slurry system, fluid loss additive DRF-1S, retarder DRH-2L, stabilizer DRK-3L, anti fading agent DRB-3S, etc. have been developed under high temperature conditions. Strength tests of cement pastes with different silica sand dosage have been carried out, and the optimal dosage of silica sand is determined to be 50%; The conventional density cement slurry system with fluid loss reducer DRF-1S and retarder DRH-2L as the main agents can meet the cementing needs under the high temperature conditions of 180 ~ 210 ℃, and achieve a new breakthrough in the high-temperature resistance of cement slurry. At the same time, the API water loss of cement slurry is controlled within 100mL, the thickening time can be adjusted, and the high-temperature settlement stability is less than 0.04g/cm3; The anti decay material DRB-3S ensures that the 28d compressive strength of the water debris at 210 ℃ is higher than 50MPa, effectively solving the problem of the compressive strength decline of the cement paste at ultra-high temperatures. The cementing quality of the cement slurry is high, providing technical support for the exploration and development of cementing. The research results provide theoretical data support for ultra-high temperature cement slurry cementing technology.