In high angle wells, downhole tractors can be used for electric line (e-line) deployed toolstring conveyance. This paper presents the job design, planning, and execution of a rigless zonal isolation in a gas well located in the Gulf of Mexico. Downhole tractors were used as the method of conveyance during this zonal isolation.
A deepwater direct vertical access gas well was suspected to have had a sand failure event. The well was assessed and identified to be a candidate for big-hole sidetrack (BHST). In preparation to the BHST, a zonal isolation was planned to be performed prior to the decomplete. This well is highly deviated with a maximum angle of 81.5 degrees. A downhole tractor was selected to be the method of conveyance for the required wireline operations. Due to well history, the wellbore was suspected to be obstructed by sand. Selection of mitigation methods to reduce the risk of sticking toolstring in sand fill is discussed. Methodology included the use of real-time video feedback to evaluate downhole condition, as well as the use of specific tension and release subs. Prior to execution System Integration Tests (SIT) were conducted between operator and service companies to ensure the e-line cable, tractors, and bottom hole assemblies (BHA) were fully compatible and operable.
As part of the zonal isolation work, a downhole camera was deployed on tractor to observe the condition of the wellbore from SCSSV to proposed cut depth. A thru-tubing packer with blow-out plug was deployed on tractor and set on depth. A jet cutter was deployed on tractor and activated on depth. The zonal isolation job was completed without excessive tractor misruns. The job added significant value by reducing rig time needed for decomplete and accelerating well handover to Production.
This case study demonstrates the capability of downhole tractor at deploying tools in a deep near-horizontal well, and downhole tractor’s compatibility with a variety of tools. Learnings relevant to the application of tractor conveyance are discussed.
Policy enabled applications are being increasingly employed to support responsive Information Technology services. In competitive business environments, such services increase adaptability of both software and the processes they implement through externalized business and security logic. Over the last decade this has driven both industry and academia to contribute to policy research and engineering by developing specification languages, frameworks and toolkits. Since this work has typically been applied to and evaluated using new enterprise solutions, policy management for existing applications has been less well studied. In this paper we share our experiences on policy enabling an existing web based solution, together with identifying new policy enabling requirements from a specific class of enterprise systems. We first detail policy enablement requirements and constraints from the perspective of management and users of the application. We then present completed and ongoing work, our observations, and future directions.
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