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A fast magnetic-ranging calculation method for steerable drilling in bulid-up section of twin parallel horizontal wells
DIAO Binbin, GAO Deli, MU Fan, ZHANG Sen
(Key Laboratory for Petroleum Engineering of Ministry of Education in China University of Petroleum(Beijing), Beijing 102249, China)
Abstract:
The pattern of twin parallel horizontal wells is an advanced well type for the efficient development of unconventional oil and gas resources such as heavy oil, oil sands and natural gas hydrates, and has broad application prospective. Accurate measurement and fine control of the adjacent well distance of the twin parallel horizontal wells are essential for the effective application of the steam-assisted gravity drainage (SAGD) technique to develop unconventional oil and gas resources. In this study, based on the principle of the two sensor packages-rotating magnet-ranging system (TSP-RMRS), a TSP-RMRS ranging algorithm considering the influence of convergence angle and off-angle angle was proposed, and the influence of the axial distance, the convergence angle and the angle of the different faces on the calculation results of the well distance was analyzed. The results show that, when the axial distances between the magnetic sub and the two sensor packages are less than or equal to the distance between the two sensor packages and the magnetic sub does not drill a certain distance with the drill bit, accurate measurements of adjacent well distance in the build-up sections of the SAGD wells can be achieved quickly by using the TSP-RMRS calculation method.
Key words:  SAGD  twin parallel horizontal wells  build-up section  adjacent well distance  magnetic-ranging