| Autor: |
Majed Al-Gharib, Sofiane Mahi, Mohammed El-Sherif, Ahmed Khalil, Abdulaziz Al Rushoud, Karim Khalil, Mohamed El-Zein, Fatemah Al-Ali, Faisal Al-Mutawa, Ahmed Fathy, Faisal Al-Naqa, Hussain Al-Haj, Mustafa Saleh, Ashis Gohain, Geroge Ibrahim, Abdullah Al-Ajmi |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
Day 3 Wed, November 14, 2018. |
| Popis: |
One of the common challenging drilling environments is harsh rocks which require specially tailored drill bit design features to deliver the maximum drilling efficiency. The interbedded nature of harsh rock formations in combination with high rock strength results in reduced bit aggressivity and premature bit wear which increases the drilling costs. This paper presents field testing a new drill bit technology that addresses those challenges. The bit was deployed and tested in a vertical application in an exploratory well in North of Kuwait and achieved the fastest penetration rate in the application. Numerous full scale pressurized laboratory tests were conducted on different rocks including limestone, sandstone and shale to develop and validate a new altered cutter geometry designed for carbonate applications. The main target of the simulations was optimizing the cutting action of the PDC cutter while drilling a carbonate formation. This resulted in development of altered cutter geometry designed for fracturing and shearing, offering improved effectiveness in medium to hard formations such as carbonates and clastic rock and more efficient cutting action than conventional round cutters. By creating subsurface cracks that propagate to the rock surface, the new cutter allows creation of thin and uncondensed cuttings, making an efficient use of energy. The first 12¼ in. 6 blades 16mm configuration bit equipped with the new cutter geometry in conjunction with a stiff rotary BHA was tested in a vertical exploratory well in Bahrah Field, North of Kuwait. The bit delivered improved performance by completing a total interval of 2,655 ft from 5,915 ft to 8,570 ft in 60 hrs resulting in 44.2 ft/hr rate of penetration while drilling from Mutriba to Burgan formations. The bit demonstrated excellent durability with a dull grade of 1-1-WT-A-X-I-NO-TD after drilling in a highly interbedded harsh application where the lithology consists mainly of limestone, shale & sandstone. The performance capability was further confirmed when the same bit drilled the second well to section TD completing a total interval of 2,630 ft with ROP of 68.7 ft/hr. achieving the top record run in north Kuwait vertical application in Bahrah field. The 12¼ in. bit with the non-planar cutters surpassed the average rate of penetration (ROP) for the same application in Bahrah Field by 76% saving the operator significant drilling time and making this bit design the top performing drill bit in the field. As a result of the continuous research and field testing, the new cutter technology has drilled more than 10 million feet globally proving its success and efficiency in a wide range of applications. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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