Drill bit "transformation" adapts to unconventional development
2021-10-09
Drill Bit "transformation" adapts to unconventional development
The burial and occurrence of unconventional natural gas resources have similarities and differences with conventional natural gas resources, mainly manifested by hidden gas reservoirs, unstable recovery factors, complex development techniques, and high requirements for mining technology. The complexity of the formation conditions of unconventional oil and gas drilling in China, the multi-directionality of the force of the drill pipe, and the harshness of the bottom hole environment, drilling equipment (drill, mud pump), machine tools (drill pipe, drilling tools, Drill Bits, etc.) , drilling fluids, and drilling processes have put forward higher requirements. The development of new and more adaptable drill bits has become the focus of major domestic and foreign manufacturers of drill bits. In view of the complexity of strata in different regions and the diversification of drilling technology, the bit manufacturing enterprises continue to optimize the bit design, accelerate the [transformation" of the drill bit, extend the service life of the drill bit, increase the drilling speed, and reduce the number and purity of the drill. Drill time and reduce the overall cost of drilling. Drill development cannot copy foreign experience
The reservoir conditions of shale gas reservoirs in China are significantly different from those in the United States. The shale gas reservoirs in the United States are buried between 200 and 2,000 meters deep, while the shale gas layers in the Sichuan Basin of China are buried at depths of 1,500 to 4,000 meters. The shale layers in the Yunnan, Yunnan and Hunan provinces are thin and often multi-layered. Setting the state is difficult to develop. The development of shale gas in China is not suitable for copying the theoretical and technical parameters of the United States. Combining the actual geological characteristics of China, the study of shale gas development theory, technology, and related equipment is a feasible way. Expert Guo Zhongzhi believes that scientific research personnel in the field of petrochemical equipment in China should go deep into the shale gas drilling site to understand the current status and use requirements of the drill bit, determine the detailed content and decomposition indicators of the drill bit development; combine the site formation, the drilling Tool combination and the drill bit usage. Optimize the bit structure; carry out the application research of diamond composite sheet and carcass material according to the decomposition index of the bit material, and independently develop the long horizontal section bit of shale gas horizontal well. "Only by doing so, can extend the life of the drill bit, speed up the drilling speed of the drill bit, reduce the number of times the drill bit is drilled, and meet the relevant maneuverability requirements," he said.
