Producing wells in Field T, Malaysia offshore have faced significant production impairment due to deposition of calcite and barite scale in the tubing and reservoir. A proactive approach is strategized to inhibit the scale formation along the inner wall of production tubing and reservoir through a scale inhibitor squeeze (SISQ) treatment with a lifespan of 2 years. The main objective of this approach is to eliminate the need of frequent stimulation jobs to maintain the production. Several attempts of scale inhibitor pumping in the past had been applied in the operator's production fields with different scale inhibitor (SI) formulations. However, some of the SISQ jobs were unsuccessful meanwhile some did not meet the treatment life targeted. A Root Cause Failure Analysis (RCFA) was conducted and the best practices and recommendations from the previous scale treatments were incorporated into this scale inhibitor squeeze treatment while the lessons learnt were implemented to prevent reoccurrence of unwanted events. In the past, most of the failed acidizing and SISQ jobs were caused by misdiagnosis of the root cause of production drop in wells, causing wrong selection of candidates right from the beginning. Another cause is the reaction between the chemical and existing scale in the tubing wall that resulted in the disintegration of the deposits, which subsequently block the flow of the well. There were also instances where coreflooding tests were not conducted due to unavailability of core samples. From the past failure contributors, the best practice proposed is to initiate any scale inhibition program by determining the correct root cause of production drop and to proceed with remedying the existing scale buildup. Examples of the solutions are through scale clean out, acidizing or workover before implementing a prevention solution such as SISQ. During the chemical selection stage, scale inhibitors should be selected based on a series of lab tests to study the performance of scale inhibitors, potential of damage formation, scale inhibitor retention core flood analysis, scale inhibitor thermal stability and fluids compatibility. Both wells B15 and D04 SS on which the SISQ jobs were conducted after acidizing job, have until now sustained their production. The MIC is well above 5 ppm target although approaching the end of 2-year treatment life. The Multifinger Imaging Tool (MIT) run downhole after one and a half years also indicated insignificant scale buildup on tubing wall. Permanent downhole gauge flowing pressure is also stable indicating no severe skin buildup. The produced water ions data, however, is insufficient to provide a view on the upward or downward trend of the scaling ions. In future replications, produced water ions sampling frequency should be increased.

BKR is a producing field, offshore Malaysia with almost 100 strings producing either naturally or utilizing gas lift as its primary artificial lift method. BKR being a mature field with increasing watercut production and declining reservoir pressures, experiences gas lifting issues such as an ever increasing lift gas demand and deteriorating lift gas utilization factor (GUF). To improve the gas lifting efficiency a pilot project utilizing foam to assist gas lifting was attempted. Based on a literature studies, foam assisted gas lift is expected to be able to reduce the gas lift consumption by gas lifted wells, as well as further improving the lifting performance of gas lifted wells by introducing a foaming agent into the flow stream. After performing the feasibility studies, 2 wells were identified at BKR field for the pilot execution, based on the candidate screening criteria. This paper presents the problems and opportunities which led to the foam assisted gas lift pilot trial in BKR field, as well as the trial results and key learnings. The theoretical background of the approach and few case studies done at other fields previously are summarized. It also details candidate screening criteria, chemical/foam lab tests to ensure foam performance and compatibility to the well system, evaluation approach, as well as potential application methods. The second part of the paper discusses the planning and actual job implementation which includes logistics, treatment well on paper exercise, well and chemical surveillance plan and detailed treatment procedures. The result of the pilot will be elaborated in detail in the paper covering the well's baseline production rate and production well test trends along the execution phase, pressure and temperature data collected, lessons learnt during pilot execution and potential way forward for the next pilot. Based on the field trial results, the foam assisted gas lift approach has proven to be one of potential solutions to overcome gas shortage and poor GUF problems in the field. The results were very promising with almost a 100% improvement in production in one of the candidates. These results meet the goal of the pilot implementation which is to find a technology with good results with minimum expenditure. Nonetheless, several operational and logistic issues need to be addressed to have sustainable results, as well as prudent cost management.