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Tender Assisted rigs are considered as one of the most efficient and economical type of rig for development, work over or Plug&Abandonment (P&A). They are composed of a support vessel and a self contained drilling rigs. The vessel are typically equipped with storage facilities (bulk, mud, tubular,spare parts, Consumable), living quarters (120 to 200 pax), power generation facilities, cranes, and helideck. Tender vessel are typically flat bottom barges or semi-submersible however in some instance, it was used a jackup- or semi-submersible rig or liftboat .[1][2]

Tender assisted is being considered for various production drilling activities in shallow, medium or Deepwater as well as infill drilling, workover or P&A .


Factory Drilling

Tender assisted are particularly suitable for high volume of wells with similar design and where downhole risks are limited. The drilling package have been continuously improved over 40 years of experience and optimized for rig move and skidding and are generally operated by experienced crews who developed themselves on this type of unit and gain an in-depth knowledge of the equipments and processes. The drilling package are evolving with the latest innovations in term of automation and equipment with the primary focus to improve the safety and efficiency for the client. In Thailand for example, a tender rig manages to perform 2 days of work activity in 24hrs thanks to offline work.

In shallow water, main competition for Tender Assisted are the Jack Ups. However Tender Rigs will remain the drilling unit of choice for the following cases:

  • risk of punch through for a jack up
  • incompatibility of spud can
  • pipelines, corral,etc on sea bed
  • water depth above 100 meters
  • platform out of reach of the jack up cantilever
  • any unconventional drilling or completion project requiring some level of integration with other supplier like dual rig drilling and sand control completion
  • any drilling project that requires large deck space

Deepwater

Tender assisted rig offers the possibility to work in deepwater above and beyond the jack up rig capacity. Several project took place over the past 20 years as per below list coupling tender along TLPs, SPAR, Platforms or Compliant Towers:

  1. TLP West Seno-Indonesia- 1,000m WD- 150 MMBOE/ 28 wells / 7,500-tonnes
  2. SPAR Kikeh SPAR-Malaysia- 1,300m WD - 500 MMBOE / 24 wells / 39,000-tonnes
  3. CT Tombua Landana- Angola- 365m WD- /38 wells / 76,000t Deck+ 56,400t four-legged CPT
  4. TLP Okume- Equatorial Guinea- 500m WD- 400 MMBOE / 13 wells / 11,500-tonnes
  5. Platform KBB- Malaysia- 137m WD - 2.2 Tscf / 12 wells/ 17,000-tonne Deck+ 12,300 tonne jacket
  6. TLP Total-Moho Nord- Congo- 650m WD / 17 wells /14,600-tonnes
  7. TLP Papa Terra- Brasil- 1,190m WD - 700 MMBOE/ 13 wells / 23,000-tonnes
  8. TLP Malikai- Malaysia- 500m WD - 108 MMBOE/ 24 wells / 27,500-tonnes
  9. CT BBLT- Angola- 396 m WD / 40 wells /top side: 40,000-tonnes
  10. [Project] Ca Rong Do -Vietnam 320 WD
  11. [Project] Chissonga- Angola - 1,200 WD

Noteworthy papers in Onepetro

Jean-Christophe LE GUEN- Tender Assisted Drilling: A World First Approach to Reactivate an Idle Platform Rig in Deepwater Angola- publication description OTC Asia- Kuala Lumpur 2020

Marvin Gary Rutland (PTT Exploration and Production PCL PTTEP) |Veerawit Benjaboonyazit (PTT Exploration and Production PCL PTTEP) | Puwadech Chatporntanadul (PTT Exploration and Production PCL PTTEP) | Kawin Intrachai (PTT Exploration and Production PCL PTTEP) | Meth Follett (PTT Exploration and Production PCL PTTEP) | Thanawee Kreethapon (PTT Exploration and Production PCL PTTEP) | Chatchai Kongdachudomkul (PTT Exploration and Production PCL PTTEP) - Efficiency Improvement and Effective Sand Control Completion Unit by Drilling Rig in Zawtika M9 Development Field - IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 27-29 August 2018, Bangkok, Thailand [1]

Jean-Christophe LE GUEN - Contractor/Operator collaboration results in light weight plug and abandonment package for long term P&A campaign- Dec 4, 2018 publication description SPE Synopsium- Kuala Lumpur 2018 [2]

Wong, J., Sarawak Shell Berhad |Wong, K., Sarawak Shell Berhad | Yeap, F., Sarawak Shell BerhadAwakening A Sleeping Dragon - Semi Submersible Tender Assist Rig Start Up- 2018 OTC Conference paper [3]

Jean-Christophe LE GUEN - Tender Assisted Drilling: a versatile and economic solution to develop fields in Mexico publication date Apr 7, 2016 publication description PECOM 2016- Villahermosa- Mexico

Jean-Christophe LE GUEN- Tender Rigs and TLP for Deepwater Environments publication dateNov 6, 2015 publication description IADC- International Deepwater Drilling- Conference and Exhibition- Rio De Janeiro

Jean-Christophe LE GUEN- Planning, Implementation and Development of an Operation Team in a Newbuild Project : Challenges and rewards publication date Nov 3, 2015 publication descriptionIADC- Critical Issues- Asia Pacific- Conference and Exhibition- Singapore

Dennis Dennay- Self-Erecting Tender Rig Combines Performance and Safety- [4]

Stig Botker, Terje Karp et al. 2001. Wellhead TLP with Tender Assisted Drilling, Offshore Technology Conference, 30 April-3 May 2001, Houston, Texas, 12988-MS, http://dx.doi.org/10.4043/12988-MS

MATHIESEN, R. 1989. The TENDER ASSISTED DRILLING - NPD EXPERIENCE, Offshore Europe, 5-8 September 1989, Aberdeen, United Kingdom, 19248-MS, http://dx.doi.org/10.2118/19248-MS

Innovation over the past 50 years

1994- Introduction of Semi tender (semisubmersible shape) for harsher & deepwater environement [ Petrodrill]

2000- Introduction of offline activity for offline pipe making. [ Smedvig ]

2003- Introduction of Quad mast - to improve tripping speed [ Smedvig ]

2007- Introduction of offline logging - enabling logging on a well while drilling on other well [ Seadrill]

2010- Introduction of offline coil tubbing [ Seadrill]

2015- Introduction of Managed Pressure Drilling (MPD) technology, combined with a drill string conveyed subs based (CCS) continuous circulation system & dynamic Managed Pressure Cementing (MPC) [ Sapura Energy] [5]

2016- Introduction of new coupled body system between Tender and TLP [ Sapura Energy] [6]

2018- Introduction of light well P&A drilling package [ Sapura Energy]

2019- Introduction of hybrid solution using tender vessel coupled to a platform rig [ Sapura Energy]

2020- (coming) Introduction of world’s first purposebuilt drilling tender to operate in the North Sea type weather conditions, the SSDT™ 5000NG design [ Sapura Energy]

References

1. Sapura energy [7]

2. Mermaid [8]

3. Drillmec [9]

4. Dietwell [10]

  1. ^ "Archived copy". Retrieved 2013-06-13. {{cite web}}: Check |archiveurl= value (help)CS1 maint: url-status (link)
  2. ^ https://www.sapuraenergy.com/type/drilling/ See bottom of page under heading 'Tender rigs'


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