Research On Development Effectiveness Of Sidetracking Well In Block Chao5

Casing sidetracking well refers to window cutting or section milling at a particular depthand then drilled a new borehole in the original casing. It includes inclined well, direction welland sidetrack horizontal well. The most prominent feature of sidetracking well and sidetrackhorizontal well is that they can make the old wells and closed well reclaim, tap the remainingoil and make old oil field recovery capacity; they can use the original well site, the upper partof the original well borehole and the original oil pipelines, so the advantage of them issignificant savings in investment.Due to Chaoyanggou oil field presence the characteristics of poor crude oil physicalproperties, low permeability reservoir and mudstone absorbent, so in the water injectiondevelopment process will cause numbers of low-yielding wells,cut-off wells and the largeproportion of casing damaged wells, because these wells can not produce normally, and therelationship of injection and production is imperfect, so that the producing degree of reservesis poor in plane and vertical, these all affecting the development effect. Through the test oflateral drilling technology can increase the utilization of old wells and improve oil recovery ofthe geological reserves, improve the effect of oil field development and reduce drilling costs.This paper is aimed at the low-yielding wells, abandoned wells, shutting down wellswhich formed in the development process at Chao5-Chao5North block of Chaoyanggou oilfield. Determine the distribution of remaining oil by the geological modeling and numericalsimulation of the block, combined with analysis of effective thickness, sand bodydistribution,the remaining geological reserves and the other factors to determine the well typeof sidetracking well, then calculated the deliverability of sidetracking well based on theproducing predict model of inclined well and horizontal well. Finally, by apply the principlesof economics, take internal rate of return, payback period, NPV as economic evaluationindicator, by estimated the drilling investment, costs, sales revenue of sidetracking well aswell as calculated the economic evaluation indicators, to achieve the economic efficiencyevaluation of the sidetracking well. Owned to still use the original well site, the original oilrecovery supporting tools, so the sidetracking well can save investment, improve theeconomic benefits, these can be seen from the evaluation results.