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

Law, Chew Chen; Zainal, Mohamed Zamrud; Chew, Kew Hong; Lee, Jang Hyun

doi:10.3390/en12122284

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…A phenomenon known as "gas robbing” occurs when one string receives a lot of gas while the other is low. As a result, the production rates of both tubing strings are frequently reduced [ 14 ]. Installing gas lift valves with tubing macaroni, in addition to the usual gas lifting procedure, is a cost-effective way to produce from a well that does not flow naturally.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis for enhancing crude oil recovery with continuous flow gas lift: A study in reference to the porous media of the upper Assam basin, India

Neog

2023

Heliyon

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis for enhancing crude oil recovery with continuous flow gas lift: A study in reference to the porous media of the upper Assam basin, India

Neog

2023

Heliyon

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Gas Lift Optimization Study in Brownfields: A Review on Dual String Gas Lift Injection Allocation In Malaysian Offshore Fields

Suggust

Kueh

2022

Day 3 Wed, October 05, 2022

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Sarawak offshore wells are mostly completed with dual string completion and are heavily relying on gas lift as the primary artificial lift. Dual string gas lift is an economical way to selectively produce from multi-stacked reservoirs in Sarawak fields. However, it poses great challenges in terms of operations, troubleshooting, allocation and optimization as both strings share a common annulus. Dual string gas lift performance diagnosis need to be done from time to time to ensure the strings production are optimized at well level. Gas injection rate is a critical input in predicting the well performance based on the gas lift performance curve. However, the gas lift injection rate for dual string is measured at well – not at string level. The gas lift injection rate into each string needs to be allocated correctly either through well modelling calibration approach, testing one string while shutting its neighbor or well tracer application. After allocating the gas lift injection rate into each string correctly, well modelling prediction run at done to mitigate multipointing issues, design optimum point of injection, establish optimum injection rate at well level and determine the optimum casing head pressure. The operator has proposed for a workflow to correct the dual gas lift injection allocation based on well modelling calibration. The workflow was implemented and resulted in multiple optimizations in terms of gas lift valve change program, choke optimization and gas lift rate optimization. Apart from that, the paper will also share on the findings from the well tracer application in correcting the gas injection allocation. This paper will focus on the production performance check on dual string gas lift performance at well level. The findings from the study are subsequently monetized as quick-gain opportunities while the operator is embarking into long term study on assessing the alternative artificial lift strategy suitable for a brownfield. The lessons learned will also be applicable to oil fields with similar situations to further improve the fields’ production.

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A Novel Approach and Application to Dual String Design in Smart Well Completion

Omolewa¹,

Oriji

2022

Day 2 Tue, August 02, 2022

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Completion design is a very important phase in the development of a field, and it has evolved over the years with more sophisticated technology. One of the latest technology trends is the Intelligent Digital Oil fields, which although started decades ago has recently received rapid traction in past few years due to reduced costs and improvement in sensors and data storage. The starting point of this technology is the smart or intelligent well system (IWS). This system significantly improves reservoir management as it enables remote control and monitoring of downhole equipment’s. Consequently, this minimizes the need for any intervention and saves OPEX. However, the IWS has majorly being applied to a single string producer or injector. Previously, a single string completion is used across the multiple zones and hence must be commingled if the zones are to be produced simultaneously. The alternative to produce simultaneously without commingling is to use Dual string completions but they have a major drawback in that they always require some intervention to be done which is expensive. The aim of this project is therefore to test a novel idea of combining a Dual String completion with an Intelligent completion. A hypothetical field with three reservoir zones stacked was used for this study. The objective was to produce the lower zones through the long string as they had similar reservoir pressures and compatible fluids while the upper zone would produce through the short string as it is incompatible with the lower zones. Two cases were considered – with and without lower completions. The major difference in these cases was the position of the accessories. The adopted design uses a feed-through dual packer, two ICVs, and a dual gauge on the long string above the gravel pack packer and on the short string, a permanent gauge is placed above the feed-through dual packer and a total of 6 control lines is required. It is concluded that the design is feasible in both cases, and it solves the short comings of the dual string completions currently being used. The critical consideration is the well architecture. The knowledge from this paper serves as a foundation for what could become a new standard design for smart completions.

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

Cited by 4 publications

References 23 publications

Sensitivity analysis for enhancing crude oil recovery with continuous flow gas lift: A study in reference to the porous media of the upper Assam basin, India

Sensitivity analysis for enhancing crude oil recovery with continuous flow gas lift: A study in reference to the porous media of the upper Assam basin, India

Gas Lift Optimization Study in Brownfields: A Review on Dual String Gas Lift Injection Allocation In Malaysian Offshore Fields

A Novel Approach and Application to Dual String Design in Smart Well Completion

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