CO2 Tracer Application to Supplement Gas Lift Optimisation Effort in Offshore Field Sarawak

Bakar, Azfar Israa Abu; Jabris, M Zul Afiq Ali; Rahman, H; Abdullaev, Bakhtiyor; Idris, Khairul Nizam; Kamis, Azman Ahmat; Yusop, Zainuddin; Kok, Jason Chin Hwa; Kamaludin, Muhammad Faris; Zakaria, Mohd Zulfadly; Mulok, Nurul Nadia Saiful

doi:10.2118/191907-ms

Cited by 7 publications

(1 citation statement)

References 1 publication

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“…In addition, there is a potential production deferment related to the well work. The well tracer for the dual string can be challenging, as discussed by Abu Bakar et al [11]. An average of six hours per survey is required with a 25% rerun for dual strings due to too many points of gas returns.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers

et al. 2019

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Upstream oil production using dual string completion, i.e., two tubing inside a well casing, is common due to its cost advantage. High pressure gas is employed to lift the oil to the surface when there is insufficient reservoir energy to overcome the liquids static head in the tubing. However, gas lifting for this type of completion can be complicated. This is due to the operating condition where total gas is injected into the common annulus and then allowed to be distributed among the two strings without any surface control. High uncertainties often result from the methods used to determine the split factor—the ratio between the gas lift rate to one string over the total gas injected. A hybrid model which combined three platforms: the Visual Basics for Application programme, PROSPER (a nodal analysis tool) and Excel spreadsheet, is proposed for the estimation of the split factor. The model takes into consideration two important parameters, i.e., the lift gas pressure gradient along the annulus and the multiphase pressure drop inside the tubing to estimate the gas lift rate to the individual string and subsequently the split factor. The proposed model is able to predict the split factor to within 2% to 7% accuracy from the field measured data. Accurate knowledge of the amount of gas injected into each string leads to a more efficient use of lift gas, improving the energy efficiency of the oil productions facilities and contributing toward the sustainability of fossil fuel.

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Section: Introductionmentioning

confidence: 99%

Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers

et al. 2019

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A Game Changer Data Acquisition Technology : Field Wide Gaslift Optimization through the Application of Welltracer Technology in a Mature Offshore Field

Khalil

Chang

Amran

et al. 2019

Day 2 Tue, October 01, 2019

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90% of Field T production relies on Gas lift as means of artificial lift. Typical surveillance strategy in assessing the health of the gas lifted wells is to deploy flowing gradient survey (FGS) in tandem with surface welltest. However, in the case of Field T, this technology meets its limitation in investigating prolific wells due to its current well mechanical condition and dual string completion environment. Welltracer technology application in the field has broken the barrier in evaluation of these wells in Field T. The Welltracer application is a non-invasive data acquisition method which measures the travel time and concentration of the CO2 return which is introduced upstream of the gas lift header. The interpreted results allow for the identification of injection points and rate. This simple idea opens up opportunity for gas lift performance evaluation of wells in Field T that was not possible through the conventional approach of FGS. This breakthrough is vital for Field T as some of the wells are facing either one or more of the following problems i.e. dual string wells with gas robbing issues, tubing leak, restricted tubing due to pack-off and multi-point injection. Twenty-three surveys and analysis were completed during the first application in Field T. The opportunity identified from the survey were categorized depending on the resources and timeframe required to execute the changes. Four enhancement opportunities were identified which only required surface valve manipulation were executed immediately and showed instant results. Other than additional barrels, the results of the campaign have a tremendous value of information that changed the earlier comprehension of the existing problems in some of the wells. This paper discusses the results of the application of the technology in Field T. This paper will also elaborate on the lessons learned and improvement recommendations in terms of project identification, execution and planning. Another important highlight that will be discussed is the limitation and assumptions made to further enhance the understanding of the Welltracer technology.

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Unlocking Well Potential with CO2 Tracer Application in High Deviation Well

Kueh

Lim

Claudius

et al. 2020

Day 1 Tue, October 29, 2019

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In offshore environment, it is common for operators to develop the field with high deviation wells, in order to optimize both field development cost and reservoir drainage. Well intervention for high deviation wells can be difficult, as specialized tools are needed for well intervention in high deviation wells. As such, high deviation wells normally have well issues after 5 years of production. In Field B, 4 high deviation wells were having unhealthy well lifting, well lifting diagnostics and optimization was needed in order to sustain well and field production. CO2 Tracer Survey was selected for well lifting diagnostics, and all wells were found to have some degree of well lifting issue. With the result from CO2 Tracer Survey, gas lift optimization was conducted, and well was restored to its design condition.

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CO2 Tracer Application to Supplement Gas Lift Optimisation Effort in Offshore Field Sarawak

Cited by 7 publications

References 1 publication

Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers

Hybrid Model for Determining Dual String Gas Lift Split Factor in Oil Producers

A Game Changer Data Acquisition Technology : Field Wide Gaslift Optimization through the Application of Welltracer Technology in a Mature Offshore Field

Unlocking Well Potential with CO2 Tracer Application in High Deviation Well

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