Wireline Surveillance Operations with Minimum Impact to Production

Abstract

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.