Northwest Oilfield Differential Drilling Helps Speeding-up Index in Old Areas Set a New High

A few days ago, two wells TK881X and TK883 in Area 8 of Northwest Oilfield completed drilling successively, and respectively created two new records of the shortest drilling cycle of inclined wells in this area: 40.56 days and the shortest drilling cycle of 38.25 days in straight wells. Stairs.

It is reported that the two wells TK881X and TK883 are development wells located on the southwest slope of the Akulole uplift in the Tarim Basin. The main target layer is developed near the Ordovician Yijianfang Formation and is a favorable location for reservoir development. The adjacent wells T810X and TK839 Wait for multiple wells to obtain industrial oil flow. Because the surface is covered with dense Populus euphratica and Hongliu, in order to protect the ecological environment of the Tahe River, the TK881X wellhead was shifted to 82 meters in the south-east direction, and the inclined well was designed to be drilled to the target layer, and the TK883 was designed to be drilled in the vertical well. Both wells adopt a three-level wellbore structure, and open-hole completion.

In order to complete the construction of two wells quickly, the technicians carefully investigated the drilling data of the adjacent wells and formulated detailed and detailed technical measures in advance. For the TK881X well, SKG127G cone bit is preferred in the upper well section, which adopts large-displacement, high-speed, high-pumping drilling technology to give full play to the bit's water horsepower; the second drilling section applies the mature technology of "PDC+screw" to realize small drilling Pressure and high speed increase the mechanical drilling speed; the directional section adopts "high-efficiency cone + single curved screw" sliding drilling, and the stable slope section uses the "PDC+screw" drilling process to increase the mechanical drilling speed. It is equipped with a high temperature resistant wireless MWD instrument to ensure that The quality of high-quality wellbore.

For the TK883 well, the "PDC+screw" drilling process is used in the long open hole section, and the use of 139.7mm large water hole drilling tool to improve the mechanical drilling speed is obvious; by optimizing the PDC bit, optimizing the drilling tool combination, hydraulic parameters and drilling fluid system formula A series of technical measures, etc., have greatly improved the single bit footage; at the same time, strengthened the on-site management organization and coordination to achieve safe and efficient drilling purposes.

The differential drilling methods of the two "twin wells" promoted a significant increase in drilling speed, and also provided valuable experience for subsequent drilling in the old areas of the oilfield.