Improvement and application of drilling fluid technology for gas exploration wells in Yanchi block

Abstract

Currently, the exploration and development scope of Changqing oilfield has gradually developed to edge blocks and deep systems, typically of Yanchi block. However, in the construction process, there are some problems such as poor well wall stability, frequent well leakage and prominent collapse contradiction, which seriously restricts the increase of drilling speed. In this paper, the measures such as well structure optimization, system formulation optimization, separate management of collapse and leakage, refined performance control, and pressure-bearing leakage plugging were taken by a combination with the construction situation in 2021 so as to improve drilling speed and reduce the complexity of downhole failures.

Keywords

• yanchi block
• exploratory well
• collapse prevention
• leakage prevention
• drilling fluid