Development and Field Test of a Self-Controlled Particle Impact Drilling System
In the exploration and development of oil and gas resources in China,conventional drilling tech-nologies are challenged by the bottlenecks such as low rate of penetration(ROP)and short footage when they are applied in hard-to-drill formations such as quartz sandstone,flint,high siliceous sandstone,pyrite and igneous rock.Based on the principle of particle high-frequency impact rock-breaking,and referring to the methods of con-crete mixing-grouting and atmospheric pressure concrete storage in high-rise buildings,the double-piston reversing mechanism,particle deposit prevention bucket,dynamic recovery and storage device,efficient separation device and 2D/3D automatic monitoring system were designed,and a self-controlled particle impact drilling system was developed,which was tested in Well JS-X1.The test results show that the system operates stably and reliably,with a particle recovery rate of 98.7%and an average ROP of 15 m/h,1.52 times more than that of the PDM drill+PDC bit process in the same formation of adjacent wells.The research conclusions provide technical support for improving ROP in drilling deep and complex hard formations.
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