Serinus Energy Inc. (Serinus, SEN or the Company), an international upstream oil and gas exploration and production company, announced Monday that the Company has drilled the Lukut Updip-1 directional well (LKU-1) in the Block L Production Sharing Agreement in Brunei to a total measured depth (MD) of 7,011 feet (2,137 meters), has set 4.5 inch casing at 6,955.3 feet (2,120 meters) after encountering high formation pressures and gas. The Company is preparing to test the well.
The LKU-1 well encountered a drilling break while drilling 6 inch hole starting at a depth of approximately 6,988 feet (2,131 meters) MD or 5,816.9 feet (1,773 meters) true vertical depth subsea (TVDss) and continuing to a depth of at 7,011 feet (2,137 meters) MD, the last 9.8 feet (3 meters) of which appears to be clean sand. Pressures rose significantly and there was material gas influx which resulted in gas being flared at surface for several hours. As a result the mud weight was subsequently increased to 17.7 pounds per gallon (ppg) to control the calculated formation pressure of 5,366 pounds per square inch (psi). Due to the significantly higher than expected formation pressures and equipment limitations, the Company determined that it could no longer safely continue to drill the LKU-1 well and consequently the 4.5 inch casing was set to allow for the well testing program. The initial planned depth for the LKU-1 well was 9,708 feet (2,959 meters) MD and 7,906.8 feet (2,410 meters) TVDss.
The section of the LKU-1 well below approximately 3,608.9 feet (1,100 meters) MD has not previously been penetrated by any wells in onshore Brunei. The Company believes that the drilling break at 6,988 feet (2,131 meters) MD corresponds to the top of a turbiditic sandstone sequence (likely the Green Zone) that was a secondary target of the well. The deeper primary target of the well (the Red Zone), which the Company expected to encounter at 7,880.5 feet (2,402 meters) MD, has not been penetrated. The Red Zone is indicated on seismic to be a much thicker and more extensive turbiditic sandstone sequence than the Green Zone.
From 5,577.4 to 7,011 feet (1,700 to 2,137 meters) MD two sandstone intervals have been penetrated that are believed to be hydrocarbon-bearing based upon oil shows in cuttings, gas shows while drilling and/or resistivity profiles. The first of these is from 5,652.8 to 5,661 feet (1,723 to 1,725.5 meters) MD and the second from 6,991.4 to 7,011 feet (2,131 to 2,137 meters) MD.
In addition a general trend of increasing silt and/or sand content with depth starting at approximately 6,118.7 feet (1,865 meters) and continuing to 7,011 feet (2,137 meters) MD (a total thickness of 892.3 feet or 272 metres) was observed. The sandy/silty shale encountered over this section also appears to be hydrocarbon charged, with increasing amounts of C1 to C5 detected while drilling. Total gas readings steadily increased while drilling from a 32.8 foot (10 meter) average of 0.49 percent at 5,577.4 feet (1,700 meters) MD to a 32.8 foot (10 meter) average of 8.1 percent at 6,922.5 feet (2,110 meters) MD. Total gas readings peaked at 47 percent at 7,009.5 feet (2136.5 meters) MD within the drilling break encountered summarized above. C1 gas readings steadily increased from a 32.8 foot (10 meter) average of 3,150 parts per million (ppm) at 5,577.4 feet (1,700 meters) MD to a 32.8 foot (10 meter) average of 58,000 ppm at 6,922.5 feet (2,110 meters) MD. C1 gas readings peaked at 332,000 ppm at 7,009.5 feet (2,136.50 meters) MD. Based upon the increased pressures and associated hydrocarbon shows, the thick silty shale zone is a potential target to be tested.
While the well has been unable to completely penetrate what is believed to be the Green Zone, the presence of two good quality sand reservoirs within an interpreted deep water shale package, suggests that the geological model of turbiditic sandstone targets is correct.
The testing program is being planned to accomodate up to three tests with the first test on the sandstone interval encountered within the zone of fast drilling below 6,991.4 feet (2,131 meters) MD. Subject to the results of the first test a decision will be made on whether to extend or modify the test program.
View Full Article
WHAT DO YOU THINK?
Click on the button below to add a comment.
Generated by readers, the comments included herein do not reflect the views and opinions of Rigzone. All comments are subject to editorial review. Off-topic, inappropriate or insulting comments will be removed.
Most Popular Articles