Application of Measurement While Drilling and Precise Control of Ultra-Short Radius Horizontal Wells in the Potential Tapping of Remaining Oil in Super High Water-Cut Old Oil Field

As a representative of the country's ultra high water cut old oilfield, Daqing oilfield has been developed for more than 60 years, with water cut up to 95% and recoverable reserves up to 90%. Among them, Changyuan has entered the late stage of development of double extra high, the remaining oil distribution is scattered, the liquid-oil ratio increases sharply, and it is faced with some development problems, such as smaller scale construction and production potential, poor effect of conventional measures, and high number of casing damage Wells. The peripheral oilfield in Daqing is characterized by thin and narrow reservoir, poor physical property, small pore throat and high reservoir temperature, which makes it difficult to use reserves economically and effectively. Conventional measures, such as fracturing, profile control and water plugging, can only improve the percolation conditions in the near-wellbore area of the reservoir, but have certain limitations on the exploration potential of the remaining oil in the plane and the top of the thick reservoir. New methods of enhanced oil recovery are urgently needed. With the development of MWD measurement technology while drilling and the improvement of trajectory adjustment accuracy, ultra-short radius lateral drilling horizontal Wells can achieve accurate geological design to explore potential targets. In this paper, the application of measurement while drilling and precise control of ultra-short radius horizontal Wells in the excavation of residual oil at the edge of potential fault, the top of thick reservoir, the casing loss well, the treatment of long shut-off and low efficiency well, and the optimization and adjustment of well pattern are studied, which provides a new way for the effective excavation of scattered remaining oil in ultra-high water cut old oilfield.