Stuck Coiled-Tubing Recovery Utilizing Surface Equipment and Methods

Stuck drilling accident is one of the most frequent accidents in the drilling process. The operation time of release drilling is also one of the most time-consuming operations in workover process. In recent years, the technique of release, by drilling string resonance, has been introduced into the drilling field, greatly reducing working hours and improving efficiency. In this paper, the release force’s sensitivity analysis is introduced to optimize the design parameters of the device and the working parameters of the release process. First, the pipe vibration behavior under the surface vibration agitator’s action is analyzed, and the natural frequencies are obtianed analytically. Second, based on Rayleigh damping and specific boundary conditions, the damping effect equation of drilling fluid is derived under drill string vibration. Finally, the influence of structural parameters, environmental parameters, and working parameters on the clamping force is obtained. This paper casts carry through the theoretical interpretation of the release force’s sensitivity analysis by stuck release mechanism and is of significance to optimize the stuck release operations.

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Challenges and Practices for Recovering Stuck Coiled Tubing Pipe

Fonseca

Torres²,

Liu³

et al. 2023

SPE Production &Amp; Operations

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Summary Stuck coiled tubing (CT) is a main operational risk leading to delays, deferred production, or even the loss of a well. Despite general commonalities, each CT recovery can face unique challenges, including managing high pressure, working under limited spatial or lifting constraints, establishing well control, or handling a cable inside the CT. This study consolidates learnings and proposes a general workflow for a basic stuck pipe scenario, rig up, recovery pressure control equipment (RPCE) and well control, CT free point evaluation, bottomhole assemblies (BHAs) and workflows for cutting and freeing the CT pipe downhole, and recovery of the CT at the surface. A consolidation of published case studies provides specific examples of the hardware, workflows, and operational considerations. In addition, the presentation of a recent case study extends the discussion to the challenges introduced by the presence of a cable in the stuck CT and its respective solution. The case study reviews the planning and execution of a CT recovery, including the use of decision trees to guide the decision-making process. It details fit-for-purpose hardware for safely anchoring the cable; packoffs for accessing, tensioning, and recovering it with slickline (SLK); an opening for deploying the wireline (WL) cutting BHA; and valves for pressure testing and well control. That workflow successfully freed 6,818 ft of stuck CT and allowed recovery of the pipe without a workover rig on location, eliminating 11 days of rig time during subsequent tubing pulling. This is the first such documented recovery case worldwide based on a thorough literature review.

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Stuck Coiled-Tubing Recovery Utilizing Surface Equipment and Methods

Cited by 3 publications

References 3 publications

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Dissolvable fracturing tool based on a controlled electrolytic method

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Challenges and Practices for Recovering Stuck Coiled Tubing Pipe

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