Coiled tubing drilling and grinding technology is widely used in shale gas well exploitation projects in Sichuan-Chongqing area. In recent years, the exploration and development of unconventional oil and gas resources...Coiled tubing drilling and grinding technology is widely used in shale gas well exploitation projects in Sichuan-Chongqing area. In recent years, the exploration and development of unconventional oil and gas resources such as shale gas and shale oil have developed rapidly in China, and shale gas in Sichuan-Chongqing block has gradually developed in the direction of deep layer, normal pressure and encryption adjustment in old areas. Affected by casing deformation, high temperature in the well, high pressure in the well, tool performance, operating parameters and other factors, the coiled tubing is prone to sticking due to the unreturned debris, and the complicated horizontal section of the well trajectory leads to the tubing self-locking not reaching the target position, and the friction resistance between tubing and casing leads to serious tool wear or fracture, which has a serious impact on the subsequent exploitation of shale gas wells. In this paper, various risks in drilling and grinding bridge plug technology during fracturing are analyzed, and according to the actual situation on the spot, some methods are put forward, such as shoe grinding selection scheme, tool selection optimization and auxiliary material use, drilling and grinding technical parameters optimization, etc., in order to avoid complicated situations and achieve the purpose of improving quality and increasing efficiency.展开更多
文摘Coiled tubing drilling and grinding technology is widely used in shale gas well exploitation projects in Sichuan-Chongqing area. In recent years, the exploration and development of unconventional oil and gas resources such as shale gas and shale oil have developed rapidly in China, and shale gas in Sichuan-Chongqing block has gradually developed in the direction of deep layer, normal pressure and encryption adjustment in old areas. Affected by casing deformation, high temperature in the well, high pressure in the well, tool performance, operating parameters and other factors, the coiled tubing is prone to sticking due to the unreturned debris, and the complicated horizontal section of the well trajectory leads to the tubing self-locking not reaching the target position, and the friction resistance between tubing and casing leads to serious tool wear or fracture, which has a serious impact on the subsequent exploitation of shale gas wells. In this paper, various risks in drilling and grinding bridge plug technology during fracturing are analyzed, and according to the actual situation on the spot, some methods are put forward, such as shoe grinding selection scheme, tool selection optimization and auxiliary material use, drilling and grinding technical parameters optimization, etc., in order to avoid complicated situations and achieve the purpose of improving quality and increasing efficiency.
