Field A, an oil field located in Peninsular Malaysia, was completed in 2007 with an initial production of 6,000 BOPD and managed to reach a peak production of 15,000 BOPD the same year, with a water cut of 15%. Toward the end of 2014, a decrease in production was observed with an increase in water cut to 85%. Coupled with high water cut, some of the wells experienced sand production issues. Most of the wells were completed with either standalone screens or without any sand control methods. After a few years in production, the sand-producing wells were shut-in to help prevent damage to surface facilities. Two idle oil wells, Wells 1 and 2, were identified and efforts were made to reactivate them. High costs can be associated with remedial mechanical sand control to work over a well, so a chemical consolidation treatment using solvent-based resin was identified as a less expensive solution for remedial sand control for these wells. Chemical sand consolidation using solvent-based epoxy resin was tested in a laboratory using produced sand samples from the selected wells and showed good results. The chemical consolidation treatments for Wells 1 and 2 were designed based on these results. Before treatment was performed for either well, Well 2 was replaced with Well 3 because of a gas supply shortage, which affected total field production. In October and November 2015, Wells 1 and 3 were intervened and chemical sand consolidation was executed on both wells. After the treatment, Wells 1 and 3 were brought back on production. Sand production for Well 1 was below the threshold limit of 15 pounds per thousand barrels (pptb). However, the performance of Well 3 did not meet expectations. This paper describes the process of treatment design and execution for the chemical sand consolidation of Wells 1 and 3 and explains the workflow used during the design stage. Coiled tubing isolation technique and bullhead treatment technique are discussed together with lessons learned from Wells 1 and 3 in terms of designing chemical sand consolidation treatments for future applications.
Accessing behind casing opportunities plays a key role in ensuring that production targets are achieved in the PETRONAS operated fields in Malaysian basin. This is however getting more challenging as these fields comprising mostly of stacked clastic reservoirs get matured. This paper provides a comprehensive review of all thru tubing perforation jobs done over last two years in PETRONAS operated fields in the region with focus on failure reasons and future mitigation measures to ensure higher rate of success. As a part of this study, all the historical thru tubing perforation jobs done to access behind casing opportunities over last 2 years across more than 22 producing fields in the region with PETRONAS as the operator were analyzed in detail. These jobs were then studied with respect to the main factors which impacts overall job success or failure. These included but was not limited to fluid contacts, gun, and charge type, nearby well performance, zone saturation data availability, completion type, contractor performance etc. In addition, post job details like sand production, artificial lift performance which contributed to well behavior post perforation were also evaluated. Exhaustive gun perforation and well model simulations were conducted to model post perforation well performance. Actual data with distribution and impact of the above-mentioned parameters will be discussed at length in the paper. Key findings which contribute to the overall successful thru tubing perforation jobs and lessons learnt for future perforation jobs will be presented in the paper. Based on the comprehensive review and in-depth analysis, the operator has gained great visibility on key focus areas for thru tubing perforation jobs to increase success rate for completing the behind casing opportunities. Results specially re-iterate the importance of saturation data, gun selection and sand control among other parameters for successful thru tubing perforation jobs in matured stacked reservoirs. The study also indicate why these parameters are even more important for multiple tubular perforations such as cement packers, complex dual string completions, multiple tubular perforation etc. Based on the findings from the study, the paper will recommend key points to consider while completing behind casing opportunities in challenging environment. While a lot of literature and study is available on perforations in general, the author could not find any noticeable work which is based on large amount of actual field data on how to improve thru tubing perforation jobs in matured stacked reservoirs in complex completions. This paper aims to help operators improve on the existing practices to ensure better and more successful results while completing behind casing opportunities using thru tubing perforations.
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