Cleanout optimizes unconventional completion
Well typeHorizontal oil well
Max. pressure3,851 psi
Total depth7,698 – 12,480 ft (2,347m-3,805m)
Max. temperature217°F (103°C)
After acquiring data for 4-5 days the recorder would be removed and Coiled Tubing (CT) would perform a confirmation run to ensure the wellbore was clear of cement stringers/debris. Data from the mini-frac would typically not be received until the frac was completed.
The operator was very keen to optimize this process. Welltec® offered an e-line clean-out solution to provide the benefits they requested: reduced time, cost savings, more accurate data acquisition and a one run solution to clean the casing.
This toolstring was run to plug back total depth 12,533 ft (3,820m) KB removing cement stringers and leaving the casing walls clean of debris. The Casing Collar Locator (CCL) confirmed depth correlation and positioned the WPT at the burst port to perform a six hour pressure/temperature reading before logging the entire liner with CCL to locate and confirm the position of each frac port.
A confirmation run with CTU and a motor will NOT get you an exact correlated PBTD depth, no CCL or BHP/BHT.
The run with CT also involves mobilizing a fluid pumper, N2 pumper, CTU, and flowback tanks and/or testers. Welltec’s RCB involves moving in the e-line mast unit, and occasionally a picker.
A wellbore CCL gives you the ability to confirm the exact location of the HZ frac ports to be identified and correlated back to the run liner tally. In one circumstance, a leak was determined in the liner post cementing. After running the Well Cleaner confirmation run, a GR/CCL/RBL was run in the same day. Upon viewing the RBL we were able to identify where there was a “washout” in the cement at a frac sleeve, and confirmed with the CTU deployed frac packer that the “washout” was the leaking sleeve. Having this data prior to running frac tools minimized many hours of multiple pressure tests, cycling charges, coil and packer fatigue.
The use of e-line/e-coil deployed tools during any fracture or stimulation of a vertical or HZ wellbore will be the next revolution in the industry.”
Trent Field, Completions
– Workovers Consultant
The Well Tractor was regarded as a revolution in the industry when it was introduced in the 1990’s. It enables operators to extend the reach of traditional e-line deployment into highly deviated and horizontal wells.
The Welltec Pressure and Temperature Tool (WPT) provides high quality data about the well primary information and status. Our measurements add value by assisting in the diagnosis of the problem or confirming it's solved.
The Well Cleaner Reverse Circulating Bit (RCB) integrates a rotary bit with a suction system to provide the combined benefits of both in one tool. This design breaks through hard packed debris and recovers the cuttings into the integrated bailers.