Reducing Well Costs by Optimizing Drilling Including Hard/Abrasive Igneous Rock Section Offshore Vietnam

Salleh, Sahabudin; Eckstrom, Darren

doi:10.2118/62777-ms

Cited by 14 publications

(6 citation statements)

References 1 publication

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“…1 The dual dynamic seal technology compares favorably to metal seal bearing rollercone products. [2][3][4][5][6][7] Additionally, the leg journal and cone bore are re-designed with a tighter and more tortuous space to reduce the amount of hard, abrasive formation and solid particles in the drilling fluid from entering the seal gland. This provides a cleaner sealing environment and prolongs the seal life further.…”

Section: Dual Dynamic Seal Packagementioning

confidence: 99%

Innovative Bearing and Seal Package Improves Rollercone Bit Performance and Reliability

Day

Baker

2010

SPE Asia Pacific Oil and Gas Conference and Exhibition

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Over the last several years, PDC bits have continued to encroach on traditional rollercone (RC) applications. The expanding PDC envelope has reduced rollercone usage to only the most demanding applications and hard/abrasive formations. Increasingly difficult wellbore requirements dictate that rollercone bits survive more on-bottom drilling/circulating hours with more footage drilled at higher RPM and weight-on-bit (WOB). Additionally, many applications require the use of directional drive systems that apply additional forces on the bit's cutting structure. Additional tool challenges include deep/hot holes, high mud weights, harsh mud chemistry, high temperatures and applications with less than desired solids control.These hostile down-hole environments contribute to bit damage and can often lead to the failure of moving components, specifically rollercone bit bearings and seals. Failure of any component in the bearing package often results in a catastrophic failure of the entire system, ending the run with the potential of fishing for lost parts. Mud encroachment into the seal is often the reason for bearing failure.To solve this problem, extensive analysis of field data and dulls was conducted to identify the conditions limiting seal/bearing life. The solution was identified and new bits were developed during field tests. Field testing included a large data set of 28 test runs against 61 control runs, all in the IADC 527-537 range and in the same application. The test results show and improvement in seal life of the test group of 26.9% over the offset data set. Since these results, testing has expanded to four different bit sizes and bit types. This paper will outline the significant time/cost savings to the operator in the test area.

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Section: Dual Dynamic Seal Packagementioning

confidence: 99%

Innovative Bearing and Seal Package Improves Rollercone Bit Performance and Reliability

Day

Baker

2010

SPE Asia Pacific Oil and Gas Conference and Exhibition

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“…This comprehensive set of enhanced ST cutting structure features, when combined with the new SEMS bearing, provided unequaled performance in many basins around the world, including the GOM. [15][16][17][18][19][20][21] An extensive forensics study on the seals and bearings from 8-1/2" SEMS steel tooth bits from the GOM was undertaken in 2003, to determine the specific failure modes and wear mechanisms experienced by these industry leading products. The wear and failure modes were also correlated back to the particular run parameters, such as depth, weight on bit (WOB), rotary speed (RPM), drilling hours, total bit revolutions (TBR), mud weight and hydraulics.…”

Section: Spe 103074mentioning

confidence: 99%

Step Change in Performance: Upgraded Bit Technology Significantly Improves Drilling Economics in GOM Motor Applications

Grimes

Kirkpatrick

2006

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWith vast regions of the Gulf of Mexico (GOM) rapidly becoming mature provinces, operators are constantly looking for ways to systematically reduce the costs of drilling development wells, especially with improved technologies that deliver reliable performance and decreased risk.The application of a new steel tooth rollercone bit with a technically advanced metal seal bearing has achieved this goal and is having a significant impact on drilling economics in the GOM. Improvements in bearing life, seal reliability and cutting structure durability have resulted in more time on bottom, thereby giving the operator the confidence to apply the new rollercone bits in long directional hole sections. Most of the wells drilled are directional, and heavy water-based drilling fluids are often required in the intermediate hole sections; heavy synthetic muds are sometimes used deep in the wellbore. Relatively high bottomhole temperatures combine with extremely high bottomhole pressures and balling shales to present a challenging drilling environment. Operators strive to increase rate of penetration, maximize hours on bottom for each bit, reduce risk, and complete the section with fewer bits to reduce the number of trips.The bit development phase consisted of a thorough analysis of field application data, along with rigorous forensic examinations of representative dulls from around the world to identify the downhole conditions and sealed bearing wear mechanisms that limited the current metal sealed bit life. A host of design and material improvements were conceived and developed to deliver an improved metal sealed bearing with significantly longer life and higher reliability.The improvements included metal seal surfaces up to 20% wider; a proprietary wear resistant surface on one seal face that greatly reduced both the seal wear rate and the coefficient of friction; improved back-up ring geometry and gland; and design features that enable more consistent manufacturing assembly processes to be utilized. The new rollercone bearing package proved to deliver unequaled life and reliability in high rotary speed drilling applications, superior to all current rollercone sealed bearing systems.The new steel tooth bit's long life, resistance to balling in water-based muds, highly steerable characteristics, and ability to be combined with various hole-opening systems make it the bit of choice for many GOM applications. The authors show actual GOM performance data of the new bits achieving an 80% reliability of nearly 700,000 total bit revolutions (TBR), compared to existing technology bits at less than 400,000 TBR. Specific case studies show examples of one new style bit replacing two to three current technology steel tooth bits, effectively doubling the footage drilled and TBR in the process. Another example shows 1 of the new technology bits replacing two current technology steel tooth bits with associated substantial cost savings due to higher ROP's and less flat time due one less trip...

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“…The bearing is unique because all relative motion takes place between two lubricated metal seal surfaces, significantly extending bearing life beyond the capabilities of an elastomer sealed bit. [4][5][6][7][8][9][10][11][12][13][14][15] To further increase bearing reliability, the new bits have a second generation bearing package with a wider metal seal surface increases sealing capacity by up to 20% (Fig. 11).…”

Section: Bearing Technologymentioning

confidence: 99%

Advanced Technology Improves Drilling Economics/Sets New Benchmark, Southeast Mexico

Urbieta¹,

Martínez²,

Escareno³

et al. 2006

Proceedings of First International Oil Conference and Exhibition in Mexico

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe majority of the fields in southeast Mexico require 1,000m to 3,400m of 17-1/2 hole to set 13-3/8 casing at the top of Encanto/Deposito formation. Lithology is typically weak sandstone with shale stringers (UCS 2,000-6,000 psi). Operators have attempted to use PDC to drill the hole section in one run with limited success. Operators required an updated steel-tooth rollercone to cut costs by reducing trips/bits to complete the section. Examination of steel-tooth dulls indicated erosive and abrasive wear due to the high sand content was the major factor limiting performance improvement.The authors will present case studies that document the new bit design has increased meterage by at least 46%, ROP by 12%. Total bit runs have decreased from six to four and the total cone revolutions have increased by 60% compared to average values of best offset runs in several fields. This has saved the operator an average of $140,000USD per 17-1/2" hole section per well.

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Reducing Well Costs by Optimizing Drilling Including Hard/Abrasive Igneous Rock Section Offshore Vietnam

Cited by 14 publications

References 1 publication

Innovative Bearing and Seal Package Improves Rollercone Bit Performance and Reliability

Innovative Bearing and Seal Package Improves Rollercone Bit Performance and Reliability

Step Change in Performance: Upgraded Bit Technology Significantly Improves Drilling Economics in GOM Motor Applications

Advanced Technology Improves Drilling Economics/Sets New Benchmark, Southeast Mexico

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