skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Designer drilling increases recovery

Abstract

Implementation of a new designer-well profile has resulted in increased recovery and production rates. The geologically complex Gullfaks field, located in the Norwegian sector of the North Sea, required a new type of well profile to increase total recovery and production rates from Gullfaks A, B and C platforms. Advances in steerable technology and directional drilling performance enabled a 3-D horizontal, extended-reach well profile, now designated as a designer well, to penetrate multiple targets. This article presents the concept, implementation and conclusions drawn from designer well application. Gullfaks field, in Norwegian North Sea Block 34/10, is the first license ever run by a fully Norwegian joint venture corporation. The license group consists of Statoil (operator), Norsk Hydro and Saga Petroleum. The field currently produces more than 535,000 bopd from three main Jurassic reservoirs.

Authors:
;  [1]; ;  [2]
  1. Statoil A/S, Stavanger (Norway)
  2. Halliburton Drilling Systems, London (United Kingdom)
Publication Date:
OSTI Identifier:
39930
Resource Type:
Journal Article
Resource Relation:
Journal Name: World Oil; Journal Volume: 216; Journal Issue: 4; Other Information: PBD: Apr 1995
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; NORTH SEA; OIL FIELDS; NATURAL GAS FIELDS; RESERVOIR ENGINEERING; NORWAY; GEOLOGIC FAULTS

Citation Formats

Eck-Olsen, J., Drevdal, K.E., Samuell, J., and Reynolds, J. Designer drilling increases recovery. United States: N. p., 1995. Web.
Eck-Olsen, J., Drevdal, K.E., Samuell, J., & Reynolds, J. Designer drilling increases recovery. United States.
Eck-Olsen, J., Drevdal, K.E., Samuell, J., and Reynolds, J. 1995. "Designer drilling increases recovery". United States. doi:.
@article{osti_39930,
title = {Designer drilling increases recovery},
author = {Eck-Olsen, J. and Drevdal, K.E. and Samuell, J. and Reynolds, J.},
abstractNote = {Implementation of a new designer-well profile has resulted in increased recovery and production rates. The geologically complex Gullfaks field, located in the Norwegian sector of the North Sea, required a new type of well profile to increase total recovery and production rates from Gullfaks A, B and C platforms. Advances in steerable technology and directional drilling performance enabled a 3-D horizontal, extended-reach well profile, now designated as a designer well, to penetrate multiple targets. This article presents the concept, implementation and conclusions drawn from designer well application. Gullfaks field, in Norwegian North Sea Block 34/10, is the first license ever run by a fully Norwegian joint venture corporation. The license group consists of Statoil (operator), Norsk Hydro and Saga Petroleum. The field currently produces more than 535,000 bopd from three main Jurassic reservoirs.},
doi = {},
journal = {World Oil},
number = 4,
volume = 216,
place = {United States},
year = 1995,
month = 4
}
  • Increased gas recoveries in depleted gas zones can be achieved through horizontal air drilling. In December 1995, OXY USA Inc. drilled the Pirkle 2, the first air-drilled horizontal well in the Carthage field of Texas. Targeting the Cretaceous Frost ``A`` zone of the lower Pettit limestone at 6,000 ft true vertical depth, the well established production in a 1,400 ft lateral section with a bottom hole pressure (BHP) of 185 psi. The initial BHP for the zone was 3,280 psi in 1942. As of April 27, 1997, the Pirkle 2 had produced 530 MMcf of gas at a rate ofmore » 1.1 MMcfd. Total cumulative gas production for the lower Pettit limestone in the Carthage field was 3.83 tcf as of January 1997. The paper discusses reservoir properties, abandonment pressure, minimizing well bore damage, drilling fluid selection, special equipment and modifications, compressors, BOPs, steering tools, drilling, completion, and production.« less
  • A graphical analysis is presented which maximizes the hydraulic impact at the bottom of the hole and uses the more classical or traditional graphical presentation mode. The analysis is similar to one by P.L. Moore, but all limit conditions are included. 3 refs.
  • This article examines such innovations in drilling technology as a giant semi-submersible rig for Arctic operation; an all-weather jack-up rig; float on/float-off rig transports; environmentally clean oil-based drilling mud; 15,000 psi BOP hardware; a compact subsea test tree; a satellite rig monitor/communications system and a digital driller training system.
  • Perhaps the most accessible way to improve performance is to make more effective use of the hydraulic energy supplied to the roller-cone bit. The task of a bit's hydraulics is to instantaneously remove drill cuttings and fines from beneath the bit to prevent regrinding the cutting and the accumulation of fines and filter cake on the bottom of the borehole or bit. Typically, hydraulic horsepower at the bit declines with depth due to system losses. The conventional practice to maintain maximum levels of hydraulic horsepower per square inch of bit area (HSI) is to decrease flow rate and significantly reducemore » nozzle size, thereby maintaining pressure drop across the bit. Reducing nozzle size,however, increases the apparent distance off bottom of the jet, resulting in lower fluid velocities and turbulent pressure fluctuations along the hole bottom. Turbulent pressure fluctuations have been found to provide lifting forces sufficient to overcome chip hold down and remove rock debris from the hole bottom. This paper presents a technique for significantly improving hole cleaning by optimizing bottomhole turbulence levels. The technique, asymmetric nozzle sizing (ANS), replaces the traditional three-nozzle configuration with one large and two smaller nozzles without altering total nozzle area, thereby maintaining constant bit pressure drop. The jet action of the larger nozzle greatly intensifies the global flow pattern and turbulence levels beneath the bit, improving cleaning efficiency.« less