British Petroleum has stemmed manufacturing declines within the Prudhoe Bay discipline on the North Slope for the third 12 months in a row. Prudhoe produces about half of complete North Slope oil output, so efficiency of the 40-year-old discipline is crucial to supporting total manufacturing on the slope, which has proven small will increase during the last two years.
In 2017, Prudhoe maintained a mean of 280,000 barrels per day, down solely barely from 280,700 barrels per day in 2016 and 281,080 barrels per day in 2015, based on Scott Digert, BP¹s subsurface supervisor for Prudhoe and Jennifer Starck, BP¹s Prudhoe manufacturing supervisor.
BP is the Prudhoe discipline operator on behalf of itself and different homeowners, primarily ConocoPhillips and ExxonMobil.
Increases at different fields on the slope, notably the CD-5 drillsite on the ConocoPhillips-operated Alpine discipline west of Prudhoe, added to total slope manufacturing and pushed 2017 Trans Alaska Pipeline System throughput to a mean of 526,000 b/d, up 1.5 % from 2016.
“We¹ve seen no decline for 3 years at Prudhoe and we¹re fairly happy about that,” Digert mentioned. Prudhoe, nonetheless among the many largest oil fields in North America, was experiencing annual declines of about 5 % till BP developed methods to mitigate the efficient decline.
Digert mentioned Prudhoe discipline operators even beat their very own inside targets for 2017, Digert mentioned Earlier within the 12 months BP anticipated to common solely 265,000 barrels per day for the 12 months.
The halt to manufacturing decline was achieved regardless of the sharp drop in crude oil costs in 2015 and BP¹s discount of drilling rigs within the discipline from 5 in 2015 to 2 in 2016 and 2017.
Production is usually maintained by protecting rigs working and drilling extra producing wells however regardless of its layoff of rigs, which BP needed to do to chop prices, the corporate has been capable of sustain manufacturing by way of quite a lot of tasks that stimulated output from present wells with out utilizing a rig. There have been 500 of those non-rig wellwork jobs carried out in Prudhoe in 2017, up from 430 in 2016.
Digert mentioned there was additionally relentless deal with the working effectivity of wells and the sphere manufacturing services that was achieved by way of superior laptop analyses of large quantities of Prudhoe discipline working information BP has acquired since 1977, when the sphere started producing.
The results of this, Digert mentioned, was a rise in Prudhoe¹s total working effectivity in 2017 reaching 85 %, up from 83 % in 2016. A two-percent enhance in working effectivity of the sphere interprets to extra oil being processed and shipped to the Trans Alaska Pipeline System as a result of there’s much less “downtime” for wells and working tools.
For comparability, BP-operated platforms within the North Sea sometimes run at working efficiencies within the mid-70-percentile vary, Starck mentioned. Field manufacturing services, primarily the massive oil and gasoline processing vegetation, ran at 95 % effectivity in 2017, on common.
One results of the elevated quantity of properly work is a return to manufacturing of outdated wells that have been taken off-line, mentioned Starck. A dramatic instance is at Flow Station 2, a course of plant within the jap facet of the sphere, the place the variety of wells accessible for manufacturing was elevated from 65 in 2015 to 90 in 2017.
The enhance within the variety of producing wells together with improved plant effectivity resulted in a manufacturing enhance from about 20,000 barrels per day to greater than 30,000 barrels per day by way of Flow Station 2, Starck mentioned.
BP additionally elevated manufacturing on the Lisburne manufacturing facility, which can be on the east facet of the Prudhoe discipline, from 24,000 barrels per day in 2016 to 40,000 barrels per day in 2017, she mentioned.
Digert mentioned the general impact has been to make 750 wells accessible for manufacturing in 2017, up from 650 in 2015. The further 100 wells offers the sphere operators extra flexibility in rotating among the many wells to optimize output, he mentioned.
For the brand new wells BP did drill, with the 2 rigs working, the corporate was capable of deal with…