Application of Gas Continuous Circulation Drilling Technology in Gravel Layer in Bozi Block

doi:10.11885/j.issn.16745086.2020.08.03.01

Abstract

Abstract: There are over 5 000 m of gravel layers in the upper strata of deep and ultra deep wells in Bozi Block. It has high hardness and poor drillability, which leads to low ROP and long drilling cycle of conventional drilling at the upper large-size borehole when conventional drilling is used. In recent years, a variety of speed-up tools and technologies have been tested, but the effect is unsatisfactory. Aiming at the difficulties of low ROP and long drilling cycle of conventional drilling for the huge-thick gravel layer in Bozi Block, using underbalanced drilling method, the scheme of gas continuous circulation drilling technology is designed, and technical measures such as well deviation control, grits cleaning and mud conversion have been formulated, and a gas continuous circulation drilling process technology suitable for the geological characteristics of huge-thick gravel layer is formed. This technology has been applied to 6 wells for 9 times in total, which has significantly improved the ROP, shortening the drilling cycle, and greatly saving the drilling costs. The gas continuous circulation drilling technology overcomes the difficulty that the stands cannot be connected when the sand setting is more than 30 m. It effectively prolongs the drilling footage of gas drilling in micro water-producing formation, and controls the maximum well deviation within the safe range of 5ånd does not affect the implementation of casing running and completion modification technology in the later stage. The gas continuous circulation drilling technology is becoming a key technology for speeding up and improving the efficiency drilling of the huge-thick gravel layer in the Bozi Block, which provides strong technical support for the trillion cubic meter capacity construction target in the Bozi-Dabei Block.

Key words: the huge-thick gravel layer, continuous circulation, gas drilling, key technology, Bozi Block

CLC Number:

TE249

LI Luchun, LIAN Zhanghua, PU Keyong, YAN Hai. Application of Gas Continuous Circulation Drilling Technology in Gravel Layer in Bozi Block[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 44-50.

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