Recently, Great Wall Drilling received a test report issued by the cement slurry laboratory of Yangtze University, which showed that the company's self-developed retarder GWR-300L had a partial fracture weight loss rate of 18 at 350 degrees Celsius78%, 3314%, with good heat resistance, marking the company's successful independent research and development of the industry's first ultra-high temperature and large temperature difference resistant neutral polymer retarder.
With the continuous exploitation of energy, the number of deep wells has gradually increased, which puts forward higher requirements for the high temperature resistance and large temperature difference resistance of cement admixtures. Great Wall drilling preferentially selects ultra-high temperature resistant monomers to provide functional groups, and introduces active cationic monomers into the molecular structure for the first time, completely breaking the synergistic mechanism, using its instability to rapidly hydrolyze, release cations, and trigger structural changesPromote the rigid group to join the backbone, forming an ultra-high temperature water loss reducer and retarder with a wide temperature range of zwitterionic copolymers, which are suitable for temperatures from 60 to 220 degrees Celsius and resistant to large temperature differences of more than 80 degrees Celsius.
In the process of achievement transformation, R&D personnel follow up every link in real time from weighing before feeding to finished quality inspection, and the product qualification rate is 100%, which is very different from laboratory samples and has strong batch stability. After 5 tons of products arrived at the Southwest Project Department of Great Wall Drilling and Cementing Company, they successfully passed the storage inspection and field test, and the performance was good. The ground cement truck shutdown test was carried out in the project department, and the slurry was in good condition. After the successful test, the retarder completed the field test of two wells in the Weiyuan block of Sichuan, and the performance of the cement slurry fully met the expectations and the construction was smooth.
In the process of independent research and development, the company broke through the technical barriers of high-temperature long-chain copolymerization technology and the bottlenecks of three key core technologies: ultra-high temperature quaternary copolymerization, large temperature difference resistance, and molecular chain design, demonstrating the company's technical strength.
* |China Petroleum News.
Correspondents |Zhang Li.
Edit |Yan Chuting.
Editor-in-charge |Hua Jinyan.