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This paper is aimed to share recent best practices in wireline well interventions in Tengiz field, specifically aimed to reduce the intervention impact to LPO (Loss Production Opportunity). Three main practices will be shared: Installation of protecting cages to conduct wireline interventions on MWPs. TCO has Multi-WellPad (MWP) facilities with a number of wells that hooked up into one production system. TCO must collect subsurface data for RoK requirements and Reservoir Management. In the past, TCO had to shut-in entire MWP to execute surveillance operations, which would negatively impact production. An intermediate improvement was to shut-in adjacent neighbor wells if any intervention scope on the working well is required, with the aim for the team to review the procedure to identify possible methods and safeguards to allow continued production to those adjacent wells to mitigate production impact. Previously, TCO could flow the well at a minimum rate in a smaller ID completion to control lifting forces, but by utilizing a different cable and logging unit provided a safer execution of PLT logging in high-rate wells that reduced uncertainties of zonal allocation and provided more accurate data. Utilization of combined PLT, RST and HFND logging tools string to maximize gathering of quality information with minimum well downtime. Using heavy cable to conduct high-rate production logging in small diameter liners. To minimize well downtime during wireline surveillance, we offer PLT\RST\Noise tool into one toolstring within taller lubricator. Combination of 3 tools provide large picture in wider range with minimum well downtime. This paper aims to provide an overview on the surveillance operations processes improvements and to share the best practices in planning of operational activities at the field with minimized impact on overall field production.
This paper is aimed to share recent best practices in wireline well interventions in Tengiz field, specifically aimed to reduce the intervention impact to LPO (Loss Production Opportunity). Three main practices will be shared: Installation of protecting cages to conduct wireline interventions on MWPs. TCO has Multi-WellPad (MWP) facilities with a number of wells that hooked up into one production system. TCO must collect subsurface data for RoK requirements and Reservoir Management. In the past, TCO had to shut-in entire MWP to execute surveillance operations, which would negatively impact production. An intermediate improvement was to shut-in adjacent neighbor wells if any intervention scope on the working well is required, with the aim for the team to review the procedure to identify possible methods and safeguards to allow continued production to those adjacent wells to mitigate production impact. Previously, TCO could flow the well at a minimum rate in a smaller ID completion to control lifting forces, but by utilizing a different cable and logging unit provided a safer execution of PLT logging in high-rate wells that reduced uncertainties of zonal allocation and provided more accurate data. Utilization of combined PLT, RST and HFND logging tools string to maximize gathering of quality information with minimum well downtime. Using heavy cable to conduct high-rate production logging in small diameter liners. To minimize well downtime during wireline surveillance, we offer PLT\RST\Noise tool into one toolstring within taller lubricator. Combination of 3 tools provide large picture in wider range with minimum well downtime. This paper aims to provide an overview on the surveillance operations processes improvements and to share the best practices in planning of operational activities at the field with minimized impact on overall field production.
Acid fracturing is a widely accepted technique to enhance production for carbonate reservoirs. This has been considered suitable for Tengiz Unit 2 reservoir development, which is characterized by tight matrix quality and low level of natural fracturing. Given the recent initiation of multi-stage acid fracturing in the development of Unit 2 (U2), it is essential to quickly integrate the most effective operational strategies and the latest data on reservoir characterization into the planning of upcoming operations. The methodology involved formulating the stimulation plan by integrating open hole logging data from Unit 2 intervals, considering relatively higher water-cut production from new wells, and utilizing acid fracturing simulations informed by existing geomechanical rock properties. This approach aimed to determine the ideal treatment sizes and flow rates for the job designs. The use of conformance control liners (CCL) in the lower completion, coupled with the EverGreen Burner (Management of Residual Materials, MRM, suite) for the initial well cleanup, enables the independent testing of Unit 2 to evaluate the success of the acid fracturing operations completing the full cycle of acid frac execution and assessment. Every new acid frac job has been based on the experience of the preceding jobs allowing for several areas for improvement. Acid recipe and volumes were the most frequent subjects to change that tested utilization of retarded acid, diverter acid system, pad gel and hydrochloric acid. On the other hand, the different intervals of Unit 2 were targeted for stimulation implying the varying nature of reservoir properties, the water risk and frac gradients in particular. Thus, the wells and reservoir compartments of interest showed contrasting productivity and water-cut that also has been a significant driver to manage the intensity of treatment by injection rate and acid volumes. The staged stimulation approach leveraged the benefits of CCL completion in the tight formation which accommodated selective treatment and delivered proper isolation between the stages. Some on-fly adjustments based on the set of calibration tests are also going to be shared along with the enhancement suggestions for execution process. The aggregate of rigless equipment, MRM well clean-up spread, slickline/wireline tools, permanent downhole gauges, and CCL well completion provide great flexibility and efficiency in planning and execution of acid fracturing in the described conditions of the tight almost undepleted carbonate reservoir. Analysis of treatment charts might shed light on the effectiveness of treatment fluid systems in terms of anticipated pressure behavior. The well flowing data and further surveillance also backs up the assessment of the acid frac reducing the uncertainties for water and productivity.
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