Coiled Tubing Gas Lift Design and Troubleshooting - Case History

Edy, I Ketut Oscar; Wicaksono, Danang N.; Saputra, Reza; Anantokusumo, Ferry

doi:10.2118/176195-ms

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…The process of coiled tubing gas lift is to inject compressed gas from the coiled tubing after the well is lowered into the coiled tubing and then discharged through the bottom of the coiled tubing, and the oil production fluid along with the gas flows from the annulus between the tubing and the coiled tubing from the bottom to the wellhead [17]. In this study, according to the process characteristics of coiled oil pipe gas lift, a temperature calculation model with pure gas phase inside the coiled oil pipe and gasliquid phase outside the coiled oil pipe is established.…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Study of Offshore Heavy Oil Wellbore with Coiled Tubing Gas Lift-Assisted Lifting

Gao,

Zhao,

Zhang

et al. 2023

Geofluids

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Offshore heavy oil resources are abundant, but they have greater difficulty and higher costs compared to onshore extraction. When crude oil flows through the seawater section, the temperature of the crude oil decreases faster, making it susceptible to solidification in the wellbore and resulting in lower well production. The cooling of crude oil becomes more pronounced in deep-water wellbore. However, the injection of low-temperature gas will have a cooling effect on the formation production fluid, which will have a negative effect. The model analyzes the effects of coiled tubing running depth, gas injection temperature, gas injection volume, coiled tubing diameter, and crude oil production on the temperature distribution of heavy oil in deep-water and shallow water wellbores. We propose recommendations for the selection of each parameter for deep and shallow water environments by analyzing and summarizing the laws.

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Section: Introductionmentioning

confidence: 99%

Temperature Field Study of Offshore Heavy Oil Wellbore with Coiled Tubing Gas Lift-Assisted Lifting

Gao,

Zhao,

Zhang

et al. 2023

Geofluids

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Gas Lift Techniques Modification to Overcome Evolution in Completion

Izwardy¹,

Edy²,

Wijanarko³

et al. 2017

Day 1 Tue, October 17, 2017

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Completion type in Vico Indonesia is designed mainly based on the subsurface considerations. Multi-layer reservoir consisting of gas and oil reservoirs related with fluvio-deltaic depositional environment influences the production strategy which will need zone isolation for single or commingled production. Many completion types have been implemented since early development including single or dual selective, monobore, and dual monobore cemented as the most recent completion. There are more than 500 wells drilled and completed using dual monobore cemented completion. This completion type gives constraints on the application of common downhole pump lift. Evolution in the completion type requires a different approach in gas lift technique for oil development. Many gas lift techniques have been applied to address the completion types. The gas lift techniques include the implementation of conventional gas lift with SPM, poor boy, coiled tubing gas lift, and coiled tubing gas lift with unloader. The first two methods are common for selective completions while the last two are fit for purpose for monobore completions. The appropriate modification and selection on the gas lift techniques exhibits a real benefit to optimize oil recovery in these various and evolving completion types in VICO. The contribution is around 70% from total oil production while single year gas lift project contributes to approximately 30% of annual production in respective year. Total cumulative production from the application of these techniques is around 10 MMBO. Modification in gas lift techniques is needed to tackle evolution of completion types. Coiled tubing gas lift with unloader is the newest technique used to enhance the advantage of coiled tubing gas lift application. The modification of gas lift techniques will be described in this paper.

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Coiled Tubing Gas Lift with Unloader-A Case History in Cemented Monobore Completion

Fedriando¹,

Edy²,

Izwardy³

et al. 2017

Day 1 Tue, October 17, 2017

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Coiled tubing gas lift (CTGL) implementation in cemented monobore completion which uses 3.5 inch tubing has been a breakthrough in VICO Indonesia. This gas lift technique has been successful on arresting decline and even ramping up the oil production in this brown field. CTGL application in VICO uses only orifice as the injection point without any presence of unloader. Thus, it has limitation on the deepest point of injection given the available pressure at surface. Declining in reservoir pressure as an effect of depletion drive reservoir is the main issue which results in early gas blowing around and shorter production life. Coiled tubing gas lift with unloader has been introduced recently to address the weakness of CTGL by adding unloader(s) to CTGL. The idea is to increase oil production and cumulative production with longer production life. Slight modification is needed on the bottomhole assembly of the CTGL to incorporate the application of the unloader. Designing opening and closing pressure of the valve is very important at this stage. This also includes the design of dome and test rack opening pressure. The trial of this technology has been installed in Nilam well on 2015 and successfully produced 229 BOPD initially which then increase to 807 BOPD with optimization on the injection pressure. Current cumulative production since the implementation of this technology is 152 MBO. This trial project uses 3 unloaders and one orifice as the injection point. The current issue in this project is on the fluctuation of the injection pressure which affects the production rate. Coiled tubing gas lift with unloader is the newest technique used in Vico to address the limitation of cemented monobore completion.

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Coiled Tubing Gas Lift Design and Troubleshooting - Case History

Cited by 8 publications

References 7 publications

Temperature Field Study of Offshore Heavy Oil Wellbore with Coiled Tubing Gas Lift-Assisted Lifting

Temperature Field Study of Offshore Heavy Oil Wellbore with Coiled Tubing Gas Lift-Assisted Lifting

Gas Lift Techniques Modification to Overcome Evolution in Completion

Coiled Tubing Gas Lift with Unloader-A Case History in Cemented Monobore Completion

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