The job required accurate orientation of the perforation planes in the direction of the maximum principle stress to ensure stable perforation tunnels to overcome a sand production problem that previously had limited production from the completion. The result was a safe and flawless onsite job execution guaranteeing flow assurance with an initial sand free oil production rate of 6,000 standard cubic meters per day (37,600 BOPD), a 20 percent increase in the overall Norne Field production potential.
"This technological achievement opens new opportunities for providing oil and gas reservoir solutions for perforating in the preferred formation stress plane to minimize sand production," said Gary Godwin, division vice president, HES, Tools, Testing & Tubing Conveyed Perforating. "It also provides methods for either reducing the likelihood of water coning into the well or increased production from wells at the same water coning likelihood. The success of this job shows that dedicated and focused research and development efforts can pay off and produce dramatic results. The G-Force system is one of many enabling technologies embedded in our PerfPro ® Process to deliver truly engineered perforated solutions to our clients."
This world first was achieved offshore in well B-3H on Statoil's Norne Field in Norway, recently. Unexpected sand production had been observed in several of the Norne Field oil production wells. Due to this, combined with water breakthrough in the original perforations in the horizontal B-3H well, the well had been shut in and required a re-perforation work-over to get it back on line. The client evaluated various solutions and concluded that Halliburton's G-Force Oriented Perforating System was the best solution to use to maximize the sand free production rate and to open new perforation channels into fresh formation in this particular well. This system allows perforating in any direction regardless of the gun's position relative to the casing. The G-Force system is an advance in technology that overcomes many limitations with earlier orienting systems that depended on special finned tandems, eccentric subs and swivels -- all of which were influenced by frictional forces and torque as the guns are conveyed in the completion leading to inaccuracy in orientation.
The G-Force system can be conveyed on either wireline or pipe and does not have any external upsets that are greater than the OD of the gun system; thus it can be utilized for through tubing applications as well. For the B-3H well a 180 degree phasing of the shots was selected at four shots per foot with premium deep penetrating Millennium ™ perforating charges. The tubing conveyed perforation (TCP) system consisting of five sections (22 feet each) was deployed using a slick wireline unit combined with a well tractor pulling the guns in place.
The result of the job was an initial sand free oil production rate in excess of 6,000 standard cubic meters per day (37,600 BOPD). The overall operation was done with dynamically positioned drilling rig Stena Don, according to plan, with an efficiency exceeding 95 percent compared to original time estimates. All well objectives were met and payback time for the operation to Statoil was approximately six days worth of production from the well.
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