Experience With Drilling C-26A, A World Record Extended Reach Horizontal Well in the Oseberg Field, North Sea.

Andresen, Sabine; Hovda, Sigve; Olsen, Tor

doi:10.2523/30463-ms

Cited by 3 publications

(1 citation statement)

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“…The Oseberg Field was discovered in 1979 and developed with two platform sites located 14 km apart 6,7 . The Oseberg Field was discovered in 1979 and developed with two platform sites located 14 km apart 6,7 .…”

Section: Oseberg Field In the Norwegian Sector North Seamentioning

confidence: 99%

Case Studies on Application of Novel Guideline Charts in Planning Well Trajectory and Mud Weight Program

Chen¹,

Tan²,

Haberfield³

2000

Proceedings of International Oil and Gas Conference and Exhibition in China

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWellbore instability remains an important and costly issue in many oil and gas fields. Field observations have shown that stress-related wellbore instability problems are still frequently encountered even though techniques to manage the problems have been adopted. The problems can be a main factor in reducing the benefits of introducing innovative drilling technology.This paper describes the methodology and procedures for determination of optimum wellbore profile and mud weight program based on rock mechanics considerations. The comprehensive methodology, covering all key aspects of wellbore instability, is presented in the form of guideline charts. The application of the methodology and procedure is described and demonstrated through three field case studies for a range of in-situ stress regimes in various parts of the world.

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Section: Oseberg Field In the Norwegian Sector North Seamentioning

confidence: 99%

Case Studies on Application of Novel Guideline Charts in Planning Well Trajectory and Mud Weight Program

Chen¹,

Tan²,

Haberfield³

2000

Proceedings of International Oil and Gas Conference and Exhibition in China

View full text Add to dashboard Cite

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Advances in Extended Reach Drilling – An Eye to 10 km Stepout

Ryan

Reynolds

Raitt

1995

SPE Annual Technical Conference and Exhibition

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SPE Members Abstract This paper will present recent technological innovations which have been used to surpass previous extended reach records together with other technologies which are viewed as fundamental in overcoming current limitations for extended reach and designer wells. The paper will focus on three specific drilling applications which provide a range of options for operating companies with varying field development philosophies. Introduction With records being continually broken in extended reach drilling (ERD) the obvious question is, how far can we go with existing technology? A recent well in the North Sea extended the step out record by 600. m to 7.8 km. The current limit is presently indeterminate, but as drilling technology continues to improve the final constraint may be economic rather than technical, as the limiting factors are gradually overcome. This paper will address some new technologies that will assist in increasing drilling reach and performance. Directional control and drilling efficiency are two items which have had significant impact on the decisions to attempt ERD and designer wells. The following directly contribute to improving directional control and drilling efficiency:–Tandem motors–Downhole adjustable stabilisers–Performance stabilisers The use of tandem motors offers more power than conventional motors and will increase overall rate of penetration (ROP). New intelligent multi-positional adjustable stabilisers can reduce hole tortuousity, thus extending the reach. It also allows inclination control, when drill string drag prevents further oriented drilling and maximises drill string rotation, which aids hole cleaning. A performance stabiliser, which is run below the motor, increases directional control. These technologies assist in optimising directional drilling performance. Fig. 1 represents a sample well profile that was generated to determine what capabilities were required to drill a 10 km stepout well at a true vertical depth (TVD) of 2900 m. This was an arbitrary two dimensional well profile generated to highlight potential problems in drilling such a well. As this was not based on any specific field, casing points were chosen that were feasible from a design perspective and to ascertain approximately how far out the casing could be run. The profile terminates in 8–1/2 in. hole as this is perceived to be the optimum configuration for most operators. There is obviously no unique 10 km stepout well as the complexity will depend particularly on the TVD of the reservoir which will subsequently determine the final measured depth and hole angle. This will have an impact on all associated activities including wireline logging, completion and workovers. Tandem Motors From the early days of single lobe, high speed-low torque to today's multiple lobe high torque-low speed configurations, the positive displacement motor (PDM) has become the workhorse in directional drilling. The need for improvement was driven by the operator's requirements of driving the latest bit technology and optimising drilling performance. P. 33

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Water shutoff in horizontal wells using gel technology

Saavedra,

Mamorra

1997

CT&F Cienc. Tecnol. Futuro

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The main objective of this research was to investigate the feasibility of setting a chemical wellbore plug in a horizontal wellbore. Two main problems associated with the wellbore plug were investigated: (a) method of placement of the plug so that slumping would not occur, and (b) selection and testing of chemicals that could be used to make wellbore plugs with sufficiently high holding pressures. Three chemicals used in the oil industry for gas and/or water shut-off were selected for the study, namely, a monomer, a polyacrylamide and a plastic. The experimental results indicate that (i) a chemical plug could be placed in a horizontal wellbore with minimum slumping if the plug is introduced into a viscous pill, and (ii) the plastic is most suitable for use in a chemical plug because of its high holding pressure. The proposed new isolation technique thus appears to be viable. However, further experimental studies are required, particularly to evaluate the effectiveness of the wellbore plug in conjunction with injection of formation gels.

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Experience With Drilling C-26A, A World Record Extended Reach Horizontal Well in the Oseberg Field, North Sea.

Cited by 3 publications

References 0 publications

Case Studies on Application of Novel Guideline Charts in Planning Well Trajectory and Mud Weight Program

Case Studies on Application of Novel Guideline Charts in Planning Well Trajectory and Mud Weight Program

Advances in Extended Reach Drilling – An Eye to 10 km Stepout

Water shutoff in horizontal wells using gel technology

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