Successful implementation of Through Tubing Technology (Sand Control and Gas Lift) in challenging offshore environment as an integrated development strategy for sustainable development of marginal fields: A Case Study

Sharma, Anurag; Singh, Alok Kumar; Anand, Saurabh; Parasher, Arunabh; Sharma, Vishal; Kale, Sagar Laxman

doi:10.2523/17309-ms

Cited by 2 publications

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“…Gas required for the system was supplied by pumping Nitrogen into the tubing-casing annulus and up into the tubing through the gas lift valve as part of the initial feasibility studies. Sharma (2014) provides a detailed explanation of the design, installation, performance and job data of the straddle gas lift installation and Nitrogen pumping. …”

Section: Well Historymentioning

confidence: 99%

Innovative Well Intervention Techniques to Sustain Production in Mature Offshore Fields

2014

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Cairn India is an operator for two mature offshore fields in India -Ravva and CB/OS-2. Due to high offshore rig cost combined with cost recovery risks, innovative well intervention techniques are implemented in both the fields to sustain production & enhance injection. This paper summarizes some of the successful well intervention cases over the past few years and how it changed the approach towards meeting production targets.Case 1: Slickline conveyed straddle gas lift technique to activate and produce from a previously shut-in well.Case 2: Wireline conveyed robotic tools to retrieve downhole screen and restore well injection. Case 3: Modular CT units and advanced downhole tools for well stimulation improving production by multiple folds.Case 4: Specific chemical system to successfully complete a vessel based stimulation campaign in water injectors; this led to an overall two-fold increase in the field injection rates.Case 5: Advanced downhole camera to identify wellbore held-up reasons during regular interventions and how it has led to several important decisions saving time and cost.The operator always looked at challenging problems as opportunities for innovative solutions. The above interventions were focused on well revival using cost effective and innovative well intervention techniques avoiding rig based workover and achieving the objective in all the above cases. A synopsis on the recently completed cases and future inventive solutions is covered in last section of the paper.

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Section: Well Historymentioning

confidence: 99%

Innovative Well Intervention Techniques to Sustain Production in Mature Offshore Fields

2014

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Successful Coiled-Tubing-Based Sand Consolidation Treatment in Remote Wells in Challenging Offshore Environment: A Case Study

Varma¹,

Anand²,

Sharma³

et al. 2015

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CB/OS-2 field is located offshore the west coast of India. The wells are of shallow depth with sanding issues. Many wells are either shut in or beaned back to control drawdown and ensure sand-free production. This has resulted in wells flowing at much lower rates than their potential. Conventional coiled tubing (CT) jobs or jobs that use a catenary system are not feasible because of the tidal/current conditions and limited load capacity of platform crane.A platform-based CT sand consolidation operation using a modular and compact unit was conducted in two wells (XA 5 and XA 6). A 20-t modular crane was installed on the platform, and a detailed platform structural load analysis was carried out for spotting the CT unit and auxiliary equipment. Since no core samples were available from the field, sand consolidation tests were conducted on a bailed-out sand sample. A CT-conveyed inflatable packer was used to isolate the deeper section of the completion. The recipe was modified and customized to suit the logistical and fluid-handling constraints on the platform.After a sand-consolidation resin treatment, well XA-05 is now producing 1,200 BOPD, in contrast to the earlier, pretreatment 300 BOPD. Well XA-06, which was shut in due to sanding issues, is now producing 300 BOPD. The wells are stable, and periodic intervention has confirmed that there is no sand fill. Pressure surveys also indicated that there has been no skin after the treatment.Despite the many technical and logistical constraints, the sand consolidation jobs were successful execution and post-job results were excellent. This success has opened the way for similar jobs in this and other of the operator's fields.

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Successful implementation of Through Tubing Technology (Sand Control and Gas Lift) in challenging offshore environment as an integrated development strategy for sustainable development of marginal fields: A Case Study

Cited by 2 publications

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Innovative Well Intervention Techniques to Sustain Production in Mature Offshore Fields

Innovative Well Intervention Techniques to Sustain Production in Mature Offshore Fields

Successful Coiled-Tubing-Based Sand Consolidation Treatment in Remote Wells in Challenging Offshore Environment: A Case Study

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