Open AccessOptimized Well Construction Cost Estimate in South of Iraqi Fields/ Case Study from Zubair Field
Author(s) -
Maher Falih Hussein,
Ahmed Rahman Shabib,
Salah Faisal Abood
Publication year - 2021
Publication title -
mağallaẗ al-buḥūṯ wa-al-dirāsāt al-nafṭiyyaẗ
Language(s) - English
Resource type - Journals
eISSN - 2710-1096
pISSN - 2220-5381
DOI - 10.52716/jprs.v11i1.438
Subject(s) - cost estimate , cost engineering , probabilistic logic , computer science , cost contingency , process (computing) , offset (computer science) , relevant cost , operations research , well control , risk analysis (engineering) , monte carlo method , reliability engineering , engineering , drilling , mathematics , systems engineering , statistics , medicine , artificial intelligence , programming language , operating system , mechanical engineering
Cost estimation and control is a crucial activity for well engineering and construction. Inaddition to the technical preparation before drilling an oil well, well construction cost is one ofthe essential activities leading to AFE (authorization for expenditure). Recently theprobabilistic method for cost estimate became necessary for understanding the risk anduncertainty of a certain cost range instead of a single (deterministic) value. This work describesthe main types of drilling contracts have been used in Basra oilfields and discusses theprinciples of well construction cost estimate according to those contracts. In addition, itsummarize the relevant cost breakdown for drilling operations. The research also illuminatesthe probabilistic method for effective well cost estimating along with deterministic method. thestudy subdivided the process of well construction into segments for cost tracking, emphasizedthe main aspects influence the well cost and leading to a methodology that can be applied bythe operator for onshore well in the south of Iraqi fields. The methodology used in this workincludes, first, analyzing data from offset wells to facilitate the possible cost out comes, andsecond, subdivide the well construction activities into fixed costs, time dependent and depthdependent costs. A probabilistic model (Monte Carlo simulation) for cost estimating isconstructed using @ Risk software. The results released for risked drilling operation, whichincludes the NPT. While revising the historical cost performances in Zubair field, it has foundthat the best practices and lesson learned of the previous activities has significantly contributedin time and cost reduction of well operation. The findings of this work contributes to improvethe decision-making by managers for best investment, enhance the planning for next activitiesand confident choice of well budget. It also helps to investigate the critical factors and actions
that can be applied on operational and contractual parameters to achieve cost reduction. A casestudy from Zubair field will be presented in order to illuminate the mentioned points.