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An extended-reach well is one in which the ratio of the measured depth (MD) vs. the true vertical depth (TVD) is at least 2:0.
An extended-reach well is one in which the ratio of the measured depth (MD) vs. the true vertical depth (TVD) is at least 2:1.


==Extended reach well achievement records==
== Extended reach well achievements and records ==


===MD/TVD ratios===
=== Overview ===
The current world record is Brintnell Well 2-10 (Amoco in Canada), with the highest MD/TVD ratio of 8.00. The top four wells are as follows.


* Amoco Brintnell 2-10 (Wabasca): MD/TVD = 8.00
Extended reach wells can be extremely long (measured depth) and relatively shallow vertically, as well as relatively short and very shallow vertically - and everything in between. The extremely long reach wells are typically drilled to distant reservoirs to reduce the infrastructure and operational footprint that would otherwise be required to access the resource. The relatively short reach wells may be drilled to provide needed reservoir contact length in very shallow reservoirs. The current world record (circa 2013) for the longest measured depth ERD well is the Chayvo Z-42 well (Exxon Neftegas Limited, Sakhalin Island, Russia) with a measured depth of 41,667 ft. and horizontal departure of 38,514 ft. Relatively short wells with MD/TVD ratio’s approaching 12 have reportedly been drilled in Western Canada in very shallow bitumen sands that are too deep to develop using surface mining techniques.
* Amoco Brintnell 1-18 (Wabasca): MD/TVD = 7.39
* Maersk Qatar BA-26 (Al Shaheen): MD/TVD = 7.04
* BP Wytch Farm M16z: MD/TVD = 6.89
* BP Wytch Farm Well M16z still holds the world record MD and horizontal departure (MD = 37,001 ft, and departure = 35,197 ft)


===Horizontal departure limits===
=== Horizontal departure limits ===
Other notable extended-reach-drilling (ERD) achievements in pushing the horizontal departure limit are:


* 9,000 to 10,000 ft TVD: Phillips (Xijiang, China) = 8 km, Norsk Hydro (Oseberg, Norway) = 7.8 km, Woodside (Goodwyn, Australia) = 7.4 km, and Statoil (Sleipner, Norway) = 7.4 km
Other notable extended reach achievements in pushing the horizontal departure distance from 30,000 ft. to 40,000 ft. (circa 2013) include:
* 13,000 to 15,000 ft TVD: Woodside (Goodwyn, Australia) = 7.4 km, and Statoil (Sleipner, Norway) = 7.4 km
* More than 20,000 ft TVD: Shell (Auger, U.S.A.) = 3.9 km


==Benefits of extended-reach wells==
*25 wells drilled by Exxon Neftegas Limited on the Sakhalin-1 project, Sakhalin Island Russia, (MD/TVD = 3.9 to 6.9)
Extended-reach wells are expensive and technically challenging.<ref name="r1" /> <ref name="r2" /> <ref name="r3" /> <ref name="r4" /> However, they can add value to drilling operations by making it possible to reduce costly subsea equipment and pipelines, by using satellite field development, by developing near-shore fields from onshore, and by reducing the environmental impact by developing fields from pads.  
*1 well drilled by Maersk Oil Qatar in the Al Shaheen field, Qatar (MD/TVD = 11.1)
*2 wells drilled by BP on the Wytch Farms project, England (MD/TVD = 6.9 to 6.6)
*1 well drilled by Total in Argentina, Cullen Norte #1 (MD/TVD = 6.7)
*1 well drilled by ExxonMobil in the Santa Ynez Unit, offshore California, USA (MD/TVD = 5.36)


==Evolution and growth in extended-reach wells==
== Benefits of extended-reach wells ==


There have been more than 1,700 extended-reach wells drilled to date, as shown in '''Fig. 1'''
Extended-reach wells are expensive and technically challenging.<ref name="r1">Scott, P.W. 1991. Increasing Reach From 3,000 m to 5,000 m. Presented at the SPE/IADC Drilling Conference, Amsterdam, Netherlands, 11-14 March. SPE-21983-MS. http://dx.doi.org/10.2118/21983-MS.</ref> <ref name="r2">Payne, M.L., Abbassian, F., and Hatch, A.J. 1995. Drilling Dynamic Problems and Solutions for Extended-Reach Operations. In Drilling Technology, ed. J.P. Vozniak, PD-Volume 65, 191–203. New York: ASME.</ref> <ref name="r3">Modi, S., Mason, C.J., Tooms, P.J. et al. 1997. Meeting the 10km Drilling Challenge. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 5-8 October. SPE-38583-MS. http://dx.doi.org/10.2118/38583-MS.</ref> <ref name="r4">Guild, G.J., Hill, T.H., and Summers, M.A. 1995. Designing and drilling extended reach wells: Part 2. Petroleum Engineer International 67 (1): 35-41.</ref> <ref name="r5">Sonowal, K., Bennetzen, B., Wong, P., Isevcan, E., 2009. How Continuous Improvement Lead to the Longest Horizontal Well in the World. Presented at the SPE/IADC Drilling Conference and Exhibition, Amsterdam. SPE-119506.</ref> <ref name="r6">Walker, M.W., Andrew J. Veselka, A.J., Harris, S.A., 2009. Increasing Sakhalin Extended Reach Drilling and Completion Capability. Presented at the SPE/IADC Conference, Amsterdam. SPE-119373.</ref> <ref name="r7">Walker, M.W., 2012. Pushing the Extended Reach Envelope at Sakhalin: An Operator’s Experience Drilling a Record Reach Well. Presented at the SPE/IADC Conference, San Diego. SPE-151046.</ref> However, they can add value to drilling operations by making it possible to reduce costly subsea equipment and pipelines, by using satellite field development, by developing near-shore fields from onshore, and by reducing the environmental impact by developing fields from pads.


<gallery widths=300px heights=200px>
== References ==
File:Devol2 1102final Page 270 Image 0001.png|'''Fig. 1—Extended-reach wells drilled to date.'''
</gallery>


'''Fig. 2''' shows the evolution of extended-reach wells in the 1990s and the future. With new technology, the goal is to see the TVD push to 30,000 ft and the horizontal departure to 50,000 ft in the 21st century. As of this printing, we are still waiting to see that goal achieved.
<references />


<gallery widths=300px heights=200px>
== See also ==
File:Devol2 1102final Page 271 Image 0001.png|'''Fig. 2—Evolution of departure distance in ERD.'''
</gallery>


==References==
[[Directional_drilling#Types_of_directional_wells|Types of directional wells]]
<references>
<ref name="r1">Scott, P.W. 1991. Increasing Reach From 3,000 m to 5,000 m. Presented at the SPE/IADC Drilling Conference, Amsterdam, Netherlands, 11-14 March. SPE-21983-MS. http://dx.doi.org/10.2118/21983-MS.</ref>
<ref name="r2">Payne, M.L., Abbassian, F., and  Hatch, A.J. 1995. Drilling Dynamic Problems and Solutions for Extended-Reach Operations. In ''Drilling Technology'', ed. J.P. Vozniak, PD-Volume 65, 191–203. New York: ASME.</ref>
<ref name="r3">Modi, S., Mason, C.J., Tooms, P.J. et al. 1997. Meeting the 10km Drilling Challenge. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 5-8 October. SPE-38583-MS. http://dx.doi.org/10.2118/38583-MS.</ref>
<ref name="r4">Guild, G.J., Hill, T.H., and  Summers, M.A. 1995. Designing and drilling extended reach wells: Part 2. ''Petroleum Engineer International'' '''67''' (1): 35-41.</ref>
<ref name="r5">Sonowal, K., Bennetzen, B., Wong, P., Isevcan, E., 2009.  How Continuous Improvement Lead to the Longest Horizontal Well in the World.  Presented at the SPE/IADC Drilling Conference and Exhibition, Amsterdam.  SPE-119506.</ref>
<ref name="r6">Walker, M.W., Andrew J. Veselka, A.J., Harris, S.A., 2009.  Increasing Sakhalin Extended Reach Drilling and Completion Capability.  Presented at the SPE/IADC Conference, Amsterdam.  SPE-119373.</ref>
<ref name="r7">Walker, M.W., 2012. Pushing the Extended Reach Envelope at Sakhalin:  An Operator’s Experience Drilling a Record Reach Well.  Presented at the SPE/IADC Conference, San Diego.  SPE-151046.</ref>
</references>


==See also==
[[PEH:Directional_Drilling]]
[[Directional drilling#Types of directional wells|Types of directional wells]]


[[PEH:Directional Drilling]]
== Noteworthy papers in OnePetro ==


==Noteworthy papers in OnePetro==
== External links ==


==External links==
== Category ==
[[Category:1.6 Drilling operations]] [[Category:1.2 Wellbore design]] [[Category:YR]]

Latest revision as of 13:40, 27 July 2016

An extended-reach well is one in which the ratio of the measured depth (MD) vs. the true vertical depth (TVD) is at least 2:1.

Extended reach well achievements and records

Overview

Extended reach wells can be extremely long (measured depth) and relatively shallow vertically, as well as relatively short and very shallow vertically - and everything in between. The extremely long reach wells are typically drilled to distant reservoirs to reduce the infrastructure and operational footprint that would otherwise be required to access the resource. The relatively short reach wells may be drilled to provide needed reservoir contact length in very shallow reservoirs. The current world record (circa 2013) for the longest measured depth ERD well is the Chayvo Z-42 well (Exxon Neftegas Limited, Sakhalin Island, Russia) with a measured depth of 41,667 ft. and horizontal departure of 38,514 ft. Relatively short wells with MD/TVD ratio’s approaching 12 have reportedly been drilled in Western Canada in very shallow bitumen sands that are too deep to develop using surface mining techniques.

Horizontal departure limits

Other notable extended reach achievements in pushing the horizontal departure distance from 30,000 ft. to 40,000 ft. (circa 2013) include:

  • 25 wells drilled by Exxon Neftegas Limited on the Sakhalin-1 project, Sakhalin Island Russia, (MD/TVD = 3.9 to 6.9)
  • 1 well drilled by Maersk Oil Qatar in the Al Shaheen field, Qatar (MD/TVD = 11.1)
  • 2 wells drilled by BP on the Wytch Farms project, England (MD/TVD = 6.9 to 6.6)
  • 1 well drilled by Total in Argentina, Cullen Norte #1 (MD/TVD = 6.7)
  • 1 well drilled by ExxonMobil in the Santa Ynez Unit, offshore California, USA (MD/TVD = 5.36)

Benefits of extended-reach wells

Extended-reach wells are expensive and technically challenging.[1] [2] [3] [4] [5] [6] [7] However, they can add value to drilling operations by making it possible to reduce costly subsea equipment and pipelines, by using satellite field development, by developing near-shore fields from onshore, and by reducing the environmental impact by developing fields from pads.

References

  1. Scott, P.W. 1991. Increasing Reach From 3,000 m to 5,000 m. Presented at the SPE/IADC Drilling Conference, Amsterdam, Netherlands, 11-14 March. SPE-21983-MS. http://dx.doi.org/10.2118/21983-MS.
  2. Payne, M.L., Abbassian, F., and Hatch, A.J. 1995. Drilling Dynamic Problems and Solutions for Extended-Reach Operations. In Drilling Technology, ed. J.P. Vozniak, PD-Volume 65, 191–203. New York: ASME.
  3. Modi, S., Mason, C.J., Tooms, P.J. et al. 1997. Meeting the 10km Drilling Challenge. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 5-8 October. SPE-38583-MS. http://dx.doi.org/10.2118/38583-MS.
  4. Guild, G.J., Hill, T.H., and Summers, M.A. 1995. Designing and drilling extended reach wells: Part 2. Petroleum Engineer International 67 (1): 35-41.
  5. Sonowal, K., Bennetzen, B., Wong, P., Isevcan, E., 2009. How Continuous Improvement Lead to the Longest Horizontal Well in the World. Presented at the SPE/IADC Drilling Conference and Exhibition, Amsterdam. SPE-119506.
  6. Walker, M.W., Andrew J. Veselka, A.J., Harris, S.A., 2009. Increasing Sakhalin Extended Reach Drilling and Completion Capability. Presented at the SPE/IADC Conference, Amsterdam. SPE-119373.
  7. Walker, M.W., 2012. Pushing the Extended Reach Envelope at Sakhalin: An Operator’s Experience Drilling a Record Reach Well. Presented at the SPE/IADC Conference, San Diego. SPE-151046.

See also

Types of directional wells

PEH:Directional_Drilling

Noteworthy papers in OnePetro

External links

Category