Risk Assessment of Optimal Sidetrack Time

Orodu, O. D.; Ako, C. T.; Craig, A. J.

doi:10.1080/10916466.2010.549888

Cited by 2 publications

(6 citation statements)

References 4 publications

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“…Remaining recoverable reserve and economic benefits must be considered to overcome the risks of sidetracking (Lerche and Mudford 2001;Orodu et al 2013). Based on fine description of reservoir in the interwell zone and the study of residual gas distribution, we selected sidetracking well location in the area with relative abundance of residual gas.…”

Section: The Methods Of Establishing Sidetracking Well Selection Standmentioning

confidence: 99%

Old well sidetracking selection standards: Sulige low-permeability gas field, China

Yuan

Zhang

Yan

et al. 2020

J Petrol Explor Prod Technol

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The old well sidetracking technology is an effective means to stabilize production and increase recovery in later stage of gas field development. Based on economical and reservoir geologic parameters of Sulige low-permeability gas field in China, method and procedure of old well sidetracking selection standards are established, which can effectively improve the sidetracking effect and adequately develop remaining gas. Comprehensively considering corresponding economic parameters including sidetracking drilling cost, operating cost, management cost, gas production rate and gas price, recoverable reserve standard of sidetracking well is determined first. According to gas recovery, gas-bearing area, porosity and gas saturation, standards of remaining geological reserve, reserve abundance and gas pay thickness of sidetracking well are obtained. According to extension direction and distribution characteristics of the sand body in research area, numerical simulation conceptual model of typical sidetracking horizontal well is established, and then standards of old gas well production rate and gas cumulative production rate for sidetracking are obtained. According to the standards, well Su 36-6-9CH is selected to be sidetracked as a horizontal well and its development effect is good. The method has important value of popularization and application in similar low-permeability gas reservoir.

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Section: The Methods Of Establishing Sidetracking Well Selection Standmentioning

confidence: 99%

Old well sidetracking selection standards: Sulige low-permeability gas field, China

Yuan

Zhang

Yan

et al. 2020

J Petrol Explor Prod Technol

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show abstract

“…1) and production timelines of Zone-B and Zone-A ( Fig. 2) as applied in Orodu et al (2011). The EMV of the no productioninjection well sidetrack is presented in Equation (5) and that of the sequence of production-injection well sidetrack is presented in Equation (6) as in the previous study but Np BT,A is modified.…”

Section: Optimization Functionmentioning

confidence: 99%

“…1). EMV construction and analysis is as explained in Newendorp and Schuyler (2000) and applied by Lerche and Mudford (2001) for deterministic evaluation of production well sidetrack under primary recovery and stochastic evaluation by Orodu et al (2011) for simultaneous and sequential production and injection wells sidetrack under waterflooding. Production performance schemes applied are Arps' rate-time exponential model and Yang's (2009) waterflood performance model derived from the Buckley and Leverett 1-D water displacement frontal advance equation.…”

Section: Optimal Sidetrack Time Modelmentioning

confidence: 99%

“…Analyzing the risk associated with sidetrack (recompletion) was extensively covered by Lerche and Noeth (2001a;2001b;2001c) and detailed analytical solution to optimal time of sidetrack in Lerche and Mudford (2001) by optimizing expected monetary value (EMV) based on production performance following Arps' rate-time exponential decline for primary recovery. Further application to secondary recovery involving oil-production and water-injection wells sidetrack for simultaneous and sequential sidetrack operation is carried out by Orodu et al (2011). The EMV is based on probable outcomes given by the risk involved.…”

Section: Introductionmentioning

confidence: 99%

“…This study aims at reducing the assumptions made by Orodu et al (2011), in particular, constant cumulative oil production prior to water breakthrough (Np BT ) at production well sidetrack time (t R )and injection well sidetrack time (t RR ) for Zone-A for sequential production-injection sidetrack. The assumption affects NPV of Branches B 1 , B 3 and E 1 (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Risk Evaluation for Production-Injection Recompletion and Sidetrack

Orodu

Tang

2011

Energy Exploration & Exploitation

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Using a decision tree and stochastic parameters, expected monetary value is calculated to evaluate optimal sidetrack time. In view of placing a high confidence level on analytical approach to optimal sidetrack time for a waterflooded reservoir based on possible uncertainty of economic and reservoir parameters and probability of sidetrack success, a major assumption on a parameter in a previous study is re-evaluated. Material balance and displacement efficiency are used to re-evaluate this critical waterflood performance parameter. The change in the relative influence of the stochastic parameters to optimal sidetrack time due to re-evaluation calls for much attention with probable need to further reduce assumptions made, however insignificant the parameter may be. This change will affect the degree of acceptability of the analytical approach. The probability of success of sidetrack sums up the geological and technical uncertainties, deconvolution of these will give the analytical approach an edge.

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Risk Assessment of Optimal Sidetrack Time

Cited by 2 publications

References 4 publications

Old well sidetracking selection standards: Sulige low-permeability gas field, China

Old well sidetracking selection standards: Sulige low-permeability gas field, China

Risk Evaluation for Production-Injection Recompletion and Sidetrack

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