Company Overcomes Challenges To Complete Intersect Bore

September 2009 Vol. 64 No. 9

Changing ground conditions
The ground conditions at 60 feet were hard and choppy, so the operator bored down to 80 feet without much improvement. Once the bore reached below the 80-foot mark, the ground conditions started to thin out and production started to increase. However, when the bore reached the 3,000 foot point and a depth of around 97 feet, mud flow became an issue.

“We had crew members surrounding the airport looking for frac-outs,” says Lane. “But it was obvious we wouldn’t be able to complete the bore in one shot. So we modified our plan and decided to intersect the bore.”

The initial pilot bore was stopped at around 3,200 feet and an 18-inch push reamer was used to ream the pilot bore hole.

“We only needed a 12-inch hole to pull the pipe in, but decided an 18-inch hole would provide a larger target for the intersect,” Kowalewski says. “Once the ream was completed the equipment was moved to the north side of the airport.”

The second stage of the bore was problem-free, and everything was matching up perfectly until they were 100 feet out from the intersect.

“We wanted to slope in from the top and overlap the first bore by 50 feet and then just drop in, but we didn’t realize there was a rock shelf separating us from the target that we bounced off of,” says Lane.

The drill head hesitated for about 100 feet until it finally bit and began dropping, but was 12 to 18 inches left of the target.

At that point, the operator leveled the bore up and made another run at the target coming straight up. This attempt worked, but resulted in an overlap of 300 feet, The second pilot bore hole was reamed and the 8-inch pipe was pulled into place. Overall the project took 24 working days to complete.

Looking back, the company has learned a lot and takes pride in this project. “This was our fourth bore with the big rig and we went over the mile mark and completed an intersect bore,” says Lane. “Not many people in this industry even attempt an intersect bore or get over the mile mark in their entire working life.”

“We’ve made it through the tough times and know what we need to do to be successful,” says Lane. “We’re also not afraid to take a chance and that’s the attitude contractors need to have in this industry.”

FOR MORE INFORMATION:
Parker Lane, (817) 832-5948
Vermeer Corp., (888) 837-6337, www.vermeer.com