Research and application of drilling and completion technologies for slim-holes in North Ordos Gas Field

Abstract:

Technical problems exists in slim-hole drilling of North Ordos Gas Field such as drilling and cementing high pump pressure， low rate of penetration and imperfect drilling technology. Well bore structure， track profile， drilling pipe， dynamical drilling tools， PDC bits， slurry density， number and setting position of the casing centralizers were optimized， and thereby formed the fast drilling and completion technology for slim-holes with low cost. 200 wells were tested using this technology， as a result， the rate of drilling cycle was reduced by more than 12%， the mechanical drilling rate increased to over 18m/h， the drilling waste and slurry for cementation decreased by 27% and 41% on average， about 500 thousand RMB on average was decreased for single well drilling cost ， the goals of cost reduction， efficiency improvement and environment protection were achieved which find out the direction for low cost and high efficient development in North Ordos Gas Field.

Key words:slim-hole;rate of mechanical penetration;well bore structure;casing centralizer;North Ordos Gas Field