The operator of a horizontal well program in Pierson, Manitoba was taking close to fourteen hours to run their casing into the hole. In order to get their casing in place, the operator would have to pick up the Kelly and circulate the casing into the hole. This takes a lot of time and effort on the part of the rig crew and because of this, the operator was looking for a different way of completing this task by cleaning up the hole prior to running casing.
- In an effort to reduce run times, the operator chose to incorporate into their drilling string an innovative downhole tool called the Cuttings Mobilizer.
- Time was spent analyzing the well plan; placement of the Cuttings Mobilizers was optimized so that cuttings which would accumulate in the low side of the horizontal and in the curve were cleaned out.
- Four Cuttings Mobilizers were placed in the drill string at a spacing of approximately 200m.
- The hole size being drilled was 159mm and the connections used were 4” Full Hole.
The company representative commented: “before I ran the Cuttings Mobilizers, I had to start circulating in the casing well off bottom and my casing running times were fourteen hours. Now I am down to eight hours”. The casing slid in without hanging up and it no longer has to best circulated in. This equates to a 43% reduction in the time required to run the casing to TD.
- To provide an Antenna Sub that can be used to drill a well plan which includes aggressive build rates.
- Do comparison testing between the Arrival Antenna Sub and the competitor’s gap subs to see if there is an opportunity to build a more reliable tool.
- To prove that the design of Arrival’s Antenna Sub is rugged enough to survive back reaming on wiper trips in conditions where the competitor’s gap subs have failed.
- Arrival provided a 4-7/8” Antenna Sub to the customer who was contracted to drill a project containing a number of similar high build rate wells in Saskatchewan. All of the wells are monobore and have surface casing set to 100m and are drilled to an average measured depth of 1500m.
- The behavior of each of the subs was measured by tracking the raw signal strength (in AC millivolts) with relation to depth.
- The signal strength from the Arrival Antenna Sub was 622mV at 110m depth and indicated a very strong efficiency of the transmitter output to the surface.
- In the two runs that the Arrival Antenna Sub was used, the Arrival sub performed better in the curve in comparison to the competitor’s designs. The insulation of competitor’s gap sub #2 was found to be shorted on surface after the run and had to be sent to the manufacturer for repair.
- Both the Arrival Antenna Sub and the competitor’s gap sub were subjected to similarly high doglegs. The Arrival Antenna Sub successfully survived the run; the competitor’s gap sub failed. The rig used a top drive and the Arrival Antenna Sub was subjected to back reaming on wiper trips throughout the build section (16 hours for run #1, and 31 hours for run #2).
- The survivability of the Arrival Antenna Sub through these tortuous conditions is a testament to the rugged design. Signal strength and efficiencies for competitor’s gap subs may be comparable to Arrival’s Antenna Sub at the start of a run however the Arrival Sub provides a more consistent, stable signal response with time and under tough drilling conditions.
Meeting customer expectations is one thing, but exceeding them is Arrival's
Working with customers to develop attainable objectives, Arrival's work doesn't
stop there. In-house engineers and industry veterans utilize the latest in
engineering and analysis technologies to determine how to 'push the envelope' to
achieve the best possible performance without introducing unnecessary risk to