A new approach to improving efficiency of gas-lift wells in the conditions of the formation of organic wax deposits in the Dragon field

Nguyen, Van Thang; Рогачев, М. К.; Александров, А. Н.

doi:10.1007/s13202-020-00976-4

Cited by 24 publications

(26 citation statements)

References 23 publications

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“…The second step is to develop a technical diagram for carrying out the necessary measures in accordance with the proposed technology for preventing wax formation in the tubing string during the operation of a gas lift well. The optimal composition of the injected associated petroleum gas (APG) is determined by the method described in our previous papers [17,51]. In these papers, we proposed that the working agent APG was initially purified from hydrogen sulfide and carbon dioxide, then the purified APG was injected without changing its hydrocarbon composition.…”

Section: Methodsmentioning

confidence: 99%

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Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

2021

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Within the past few decades, the production of high-wax oils at offshore fields in Vietnam has been fraught with severe problems due to the intense formation of asphalt-resin-paraffin deposits (ARPD) in the downhole oil and gas equipment. The formation of organic wax deposits in the tubing string led to a significant decrease in gas-lift wells production, efficiency of compressor units, transport capacity of the piping systems, along with an increase in equipment failure. Subsequently, the efficiency of gas-lift wells dramatically decreased to less than 40% as a whole. The existing methods and technologies for combating organic wax deposit formation in downhole equipment have many advantages. However, their use in producing high-wax anomalous oil does not entirely prevent the wax formation in the tubing string and leads to a significant reduction in oil production, transport capacity, and treatment intervals. The results of theoretical and experimental studies presented in this article demonstrate that a promising approach to improve the efficiency of gas-lift wells during the production of high-wax oil is to use the technology of periodic injection of hot associated petroleum gas (APG) into the annulus of an oil-producing well. The effectiveness of the proposed method of combating wax formation in gas-lift wells highly depends on the combination of a few factors: the determination of wax deposit formation intensity in the well and the implementation of a set of preparatory measures to determine the optimal injection mode of hot APG (flow rate and injection depth) into the annulus between tubing strings and technological pipes. The injection depth of the hot APG should not be less than the depth of wax formation in the tubing string. The optimal injection rate of hot APG is determined by analyzing and mathematically modeling the APG injection system based on well-known thermodynamic laws.

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Section: Methodsmentioning

confidence: 99%

“…Well-known methods to prevent and mitigate wax deposits in downhole equipment during the operation of gas-lift wells are mechanical, thermal, and chemical methods [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

2021

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“…Significant wax deposition problems have been reported and well-documented both in technical and research literature. These include costs connected with production downtime and pipelines replacement [16][17][18][19][20][21][22], as well as costs due to prevention operations [23,24].…”

Section: Introductionmentioning

confidence: 99%

Planning pipeline pigging operations with predictive maintenance

2021

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Deposition of waxes, asphaltenes, scales or hydrates is one of the most challenging operational problems in the oil and gas industry, both during production and transportation. Direct inspection procedures, such as employing a closed-circuit television system, allow visual assessment of the blockage, yet discretely in time and, consequently, of low value for the purpose of ensuring production over time. Therefore, an indirect predictive maintenance method for systematic evaluation of the internal pipe section is herein developed, adding a much needed solution to the current body of knowledge. Using continuous field measurements, it is now possible to predict when pigging should be performed to avoid significant blockages. Moreover, evaluating the maintenance plan risk is another major achievement. Finally, the proposed methodology and model were applied to a real case-study yielding good results compared to the current scheduled maintenance approaches.

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“…Hence, in this study, we want to develop a technical solution to improve the efficiency of the shearer's loading process and then compare its performance with the one being used by DEM software (Discrete Element Method) to validate the accuracy and reasonableness of the proposed technology. The DEM software is a computer simulation that has been widely used in several fields, such as geotechnical engineering, geology, and machinery fields [12][13][14][15][16][17], and especially the screw conveying field [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Efficiency of Coal Loading ‎Process by Simulating the Process of Loading onto the Face Conveyor with a Shearer with an ‎Additional Share

Xuan

Gabov

Lykov

et al. 2021

IJE

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This paper analyses the possibility of increasing the efficiency of loading the destroyed rock mass into the face scraper conveyor by the lagging screw actuator of the shearer in the process of coal mining in the complex mechanized treatment faces of coal mines. It was taken into account that the most significant influence on the loading efficiency of coal is exerted by the dimensions of the cross-sectional area of the loading window, the distance between the screw and conveyor and the height of the bottom of the conveyor. Non-traditional technical solutions are proposed that reduce the negative impact of the gap between the screw and the conveyor on the efficiency of coal loading by the lagging screw actuator of shearers and increase the degree of filling of the conveyor groove. Technical solutions contribute to the formation of a rational section of the cargo flow in the trough of the downhole conveyor and, therefore, increase its productivity. The results of modeling the process of loading coal onto the face conveyor by an auger actuator with an additional loading device are presented. Evaluation of the effectiveness of the proposed constructive technical solutions for the interface unit in the loading area confirmed an increase of 2.94 times the maximum capacity of the screw executive body for loading coal onto the face conveyor while 2.7 times less specific energy consumption during loading.

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A new approach to improving efficiency of gas-lift wells in the conditions of the formation of organic wax deposits in the Dragon field

Cited by 24 publications

References 23 publications

Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

Planning pipeline pigging operations with predictive maintenance

Evaluating the Efficiency of Coal Loading ‎Process by Simulating the Process of Loading onto the Face Conveyor with a Shearer with an ‎Additional Share

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