Reviving Two Offshore Oil Wells by Coiled Tubing Gas Lift System Using the Reservoir Gas Cap Energy

Challenging Catenary Coiled Tubing Thru Tubing Screen Deployment Operation Offshore Borneo

10.2118/204419-ms ◽

2021 ◽

Author(s):

Seng Wei Jong ◽

Yee Tzen Yong ◽

Yusri Azizan ◽

Richard Hampson ◽

Rudzaifi Adizamri Hj Abd Rani ◽

...

Keyword(s):

Oil Wells ◽

Well Control ◽

Coiled Tubing ◽

Open Hole ◽

Catenary System ◽

Offshore Oil ◽

Gravel Pack ◽

Emergency Measures

Abstract Production decline caused by sand ingress was observed on 2 offshore oil wells in Brunei waters. Both wells were completed with a sub-horizontal openhole gravel pack and were subsequently shut in as the produced sand would likely cause damage to the surface facilities. In an offshore environment with limited workspace, crane capacity and wells with low reservoir pressures, it was decided to intervene the wells using a catenary coiled tubing (CT) vessel. The intervention required was to clean out the sand build up in the wells and install thru-tubing (TT) sand screens along the entire gravel packed screen section. Nitrified clean out was necessary due to low reservoir pressures while using a specialized jetting nozzle to optimize turbulence and lift along the deviated section. In addition, a knockout pot was utilized to filter and accommodate the large quantity of sand returned. The long sections of screens required could not be accommodated inside the PCE stack resulting in the need for the operation to be conducted as an open hole deployment using nippleless plug and fluid weight as well control barrier. A portable modular crane was also installed to assist the deployment of long screen sections prior to RIH with CT. Further challenges that needed to be addressed were the emergency measures. As the operation was to be conducted using the catenary system, the requirement for an emergency disconnect between the vessel and platform during the long cleanout operations and open hole deployment needed to be considered as a necessary contingency. Additional shear seal BOPs, and emergency deployment bars were also prepared to ensure that the operation could be conducted safely and successfully.

Download Full-text

A new transient model to simulate and optimize liquid unloading with coiled tubing conveyed gas lift

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2021.108394 ◽

2021 ◽

Vol 200 ◽

pp. 108394

Author(s):

Guoqing Han ◽

Gaoqiang Ma ◽

Yue Gao ◽

He Zhang ◽

Kegang Ling

Keyword(s):

Transient Model ◽

Coiled Tubing ◽

Gas Lift

Download Full-text

Lessons Learnt from Integrated Production Modelling and Performance Analysis of Gas Lift Wells of One of the Biggest Offshore Complexes in India

10.2118/205611-ms ◽

2021 ◽

Author(s):

Sagun Devshali ◽

Ravi Raman ◽

Sanjay Kumar Malhotra ◽

Mahendra Prasad Yadav ◽

Rishabh Uniyal

Keyword(s):

Performance Analysis ◽

Flow Line ◽

Gas Injection ◽

Injection Rate ◽

Oil Wells ◽

Nodal Analysis ◽

Integrated Production ◽

And Performance ◽

Gas Lift ◽

Production Modelling

Abstract The paper aims to discuss various issues pertaining to gas lift system and instabilities in low producer wells along with the necessary measures for addressing those issues. The effect of various parameters such as tubing size, gas injection rate, multi-porting and gas lift valve port diameter on the performance analysis of integrated gas lift system along with the flow stability have been discussed in the paper. Field X is one of the matured offshore fields in India which has been producing for over 40 years. It is a multi-pay, heterogeneous and complex reservoir. The field is producing through six Process Complexes and more than 90% of the wells are operating on gas lift. As most of the producing wells in the field are operating on gas lift, continuous performance analysis of gas lift to optimize production is imperative to enhance or sustain production. 121 Oil wells and 7 Gas wells are producing through 18 Wellhead platforms to complex X1 of the field X. Out of these 121 oil wells, 5 are producing on self and remaining 116 with gas lift. In this paper, performance analysis of these 116 flowing gas lift wells, carried out to identify various problems which leads to sub-optimal production such as inadequate gas injection, multi-porting, CV choking, faulty GLVs etc. has been discussed. On the basis of simulation studies and analysis of findings, requisite optimization/ intervention measures proposed to improve performance of the wells have been brought out in the paper. The recommended measures predicted the liquid gain of about 1570 barrels per day (518 barrels of oil per day) and an injection gas savings in the region of about 28 million SCFD. Further, the nodal analysis carried out indicates that the aforementioned gas injection saving of 28 million SCFD would facilitate in minimizing the back pressure in the flow line network and is likely to result in an additional production gain of 350 barrels of liquid per day (65 barrels of oil per day) which adds up to a total gain of 1920 barrels of liquid per day (583 barrels of oil per day). Additionally, system/ nodal analysis has also been carried out for optimal gas allocation in the field through Integrated Production Modelling. The analysis brings out a reduction in gas injection by 46 million SCFD with likely incremental oil gain of ~100 barrels of oil per day.

Download Full-text

Statistical models application for early fault detection in offshore oil wells

Rio Oil and Gas Expo and Conference ◽

10.48072/2525-7579.rog.2020.105 ◽

2020 ◽

Vol 20 (2020) ◽

pp. 105-106

Author(s):

Antonio Orestes de Salvo Castro ◽

Mayara de Jesus Rocha Santos ◽

Albino Lopes D'Almeida ◽

Geraldo de Souza Ferreira ◽

Gilson Brito Alves Lima ◽

...

Keyword(s):

Fault Detection ◽

Statistical Models ◽

Oil Wells ◽

Early Fault Detection ◽

Offshore Oil

Download Full-text

Intelligent Automation for Intermittent-Gas-Lift Oil Wells

10.2118/69404-ms ◽

2001 ◽

Cited By ~ 1

Author(s):

Jose F. Correa ◽

Odair G. Santos ◽

Paulo C.M. Inazumi

Keyword(s):

Oil Wells ◽

Gas Lift

Download Full-text

Pressure Buildup in Gas-Lift Oil Wells, Falah Field, Offshore Dubai

Journal of Petroleum Technology ◽

10.2118/11446-pa ◽

1984 ◽

Vol 36 (03) ◽

pp. 466-474

Author(s):

Alok Jain ◽

Joseph A. Ayoub

Keyword(s):

Oil Wells ◽

Pressure Buildup ◽

Gas Lift

Download Full-text

Mechanic simulator fluids for clean-up operations and phases separation in vertical and horizontal wells with coiled tubing technology

Sistemas y Telemática ◽

10.18046/syt.v13i32.2017 ◽

2015 ◽

Vol 13 (32) ◽

pp. 61-73

Author(s):

Juan David Tarache Serrano ◽

Germán Eduardo Martínez Barreto ◽

Jenny Catalina González Peña ◽

Magda Alexandra Trujillo Jiménez

Keyword(s):

Phase Separation ◽

Horizontal Wells ◽

Oil Wells ◽

Previous Knowledge ◽

Coiled Tubing ◽

Cleaning Methods ◽

Physical Features

This Project look for the processes simulation that take place in the oil Wells that operate the coiled tubing technique, so its workers, Company personal and anyone that wants to look these processes, can prove that consist in their cleaning methods and phase separation in these Wells, and at the same time, in what way the substances that in and out of well are controlled, show their physical features and allow that a person, without previous knowledge about the topic, may understand easily what is it injection fluid purpose by means of the C. T. in oil Wells.

Download Full-text

Study on Sizes Optimization and Material Selection of Casing Material in Gas-Lift Well under Existence of CO2 Corrosion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.700.59 ◽

2013 ◽

Vol 700 ◽

pp. 59-62

Author(s):

Ling Feng Li

Keyword(s):

Material Selection ◽

Oil Wells ◽

Working Environments ◽

Gas Lift ◽

Selection Of

Some oil wells have adverse working environments, material selection and sizes optimization of casing material for gas-lift well under existence of CO2corrosion are very important. This paper presents the development background, sizes optimization of casing material for gas-lift well, effect of CO2on material of casing, casing material selection. By testing, the study above has a strong practicality and can be suitable for the well condition of on-the-spot application.

Download Full-text