Coiled Tubing Milling Operations: Successful Application of an Innovative Variable-Water Hammer Extended-Reach BHA to Improve End Load Efficiencies of a PDM in Horizontal Wells

Castaneda, Juan Carlos; Schneider, Christopher E.; Brunskill, Doug

doi:10.2118/143346-ms

Cited by 13 publications

(1 citation statement)

References 6 publications

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“…The principle of the Coanda effect is the fluid flow cling to the convex surface [3]. The Water Hammer Vibrator controls the flow direction through Coanda effect so as to change the direction of its internal piston moves, forms a cycle of water hammer effect by reciprocating movement of the piston, results in huge water hammer force, pulls the tubing into the hole [4].…”

Section: Introductionmentioning

confidence: 99%

The Optimized Design of Coanda Effect Control Switch in the Water Hammer Vibrator

Ding

Niu

Zhang

et al. 2014

AMM

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As injector injects coiled tubing into well to a certain depth, the coiled tubing is unable to be injected continuously because of the increasing friction between the coiled tubing and the wellbore. With the core technology being an effective role in the Coanda Effect control switch, the Water Hammer Vibrator may extend the depth of the coiled tubing into the wellbore. Firstly, the paper verifies the effectiveness of the Coanda Effect control switch in Water Hammer Vibrator. Secondly, it optimizes the structure of the Coanda Effect control switch and improves the driving force of the piston of the water hammer vibrator without changing the injection flow rate, pressure and the other boundary conditions. Finally, it obtains varying patterns of the hydraulic cylinder pressure at both ends in the process of the Coanda feedback and trigger action by the experiment of the Coanda Effect control switch to measure pressure at both ends of hydraulic cylinder with the NI data acquisition unit. The results confirm the validity of the optimized Coanda Effect control switch in water hammer vibrator, so as to ensure the implementation and improvement in the water hammer effect of Water Hammer Vibrator.

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Section: Introductionmentioning

confidence: 99%

The Optimized Design of Coanda Effect Control Switch in the Water Hammer Vibrator

Ding

Niu

Zhang

et al. 2014

AMM

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The Effects of Fluid Hammer Tools on the Efficiencies of Coiled Tubing Plug Milling - A Comparative Best Practices Study

Schneider¹,

Craig²,

Castaneda³

et al. 2011

All Days

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Horizontal fracture stimulated completions remain the de facto method of producing from shale formations. The vast majority of wells are completed using the "Plug and Perf" fracturing technique which later requires either a drill string or coiled tubing (CT) with a positive displacement motor (PDM) to remove the composite plugs. An estimated 6,000 to 8,000 wells are completed each year, with between 100,000 to 140,000 composite plugs installed in them in the U.S. alone. In extended reach horizontal completions, plug removal using CT becomes less efficient since end load forces transmitted to the PDM from the coiled tubing decrease as well depth increases.Currently many operators rely on 'word of mouth' to design and perform extended reach CT jobs, resulting in 'nonengineered' and poorly executed plug milling operations. However, one new method to extend the operating envelope of efficient coiled tubing plug milling utilizing a water hammer tool has gained significant momentum. Several water hammer tools are in common use and there is significant anecdotal evidence that their application has improved job efficiencies. This paper reviews plug milling efficiencies and general best practices from milling operations conducted in shale formations across the US (Eagle Ford, Bakken, Haynesville, Barnett and the Marcellus). The scope will cover operations completed with three different fluid hammer tools and base cases conducted without these tools.The paper will also discuss milling efficiencies, number of stalls, stuck pipe incidents, speed and frequency of wiper trips and fluid selection associated with plug milling operations. The authors believe that the information presented in this paper will provide relevant analytical data to assist operators in improving the overall efficiency of the completion process.

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Best Practices for Composite Plug Milling

et al. 2012

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Horizontal fracture-stimulated completions remain the de facto method of producing hydrocarbons from shale formations. The vast majority of wells are completed using the "Plug and Perf"method, which requires either a jointed pipe or coiled tubing (CT) with a positive displacement motor (PDM) to mill out the composite plugs (CP) after the fracturing operations are finished. It is estimated that between 100,000 to 140,000 composite plugs are installed and milled each year in the US alone. Efficient removal of these composite plugs is critical in achieving operational efficiencies forboth the operator and service suppliers. Currently many milling operations are planned at the well-site with engineering or operational risk assessments performed only after problems arise. This paper will provide data to assist operators in improving those risk assessments. This paper will describe best practices and recommendations for pre-job planning, mill design, motor selection, fluid selection, weight on bit, wiper trip frequency and speed, whether to produce the well during milling, surface flowback equipment, operational contingencies and data analysis. These best practices have been developed from reviewing operational practices on many operations across the US.

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Coiled Tubing Milling Operations: Successful Application of an Innovative Variable-Water Hammer Extended-Reach BHA to Improve End Load Efficiencies of a PDM in Horizontal Wells

Cited by 13 publications

References 6 publications

The Optimized Design of Coanda Effect Control Switch in the Water Hammer Vibrator

The Optimized Design of Coanda Effect Control Switch in the Water Hammer Vibrator

The Effects of Fluid Hammer Tools on the Efficiencies of Coiled Tubing Plug Milling - A Comparative Best Practices Study

Best Practices for Composite Plug Milling

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