PUBLICATION RIGHTS RESERVED THIS PAPER IS TO BE PRESENTED AT THE INTERNATIONAL TECHNICAL MEETING JOINTLY HOSTED BY THE PETROLEUM SOCIETY OF CIM AND THE SOCIETY OF PETROLEUM ENGINEERS IN CALGARY, JUNE 10 TO 13, 1990. DISCUSSION OF THIS PAPER IS INVITED. SUCH DISCUSSION MAY BE PRESENTED AT THE MEETING AND WILL BE CONSIDERED FOR PUBLICATION IN CIM AND SPE JOURNALS IF FILED IN WRITING WITH THE TECHNICAL PROGRAM CHAIRMAN PRIOR TO THE CONCLUSION OF THE MEETING.

Abstract

Two different horizontal water jet drilling systems have been developed and extensively field tested. The first, the Ultrashort Radius Radial System (URRS) is built around 32 nun (1-1/4 inch) coiled tubing and provides multiple 30 to 60 m (100 to 200 foot) radials from a vertical borehole. Accuracy is + 2 to 30 in vertical trajectory.

The second system, the Remotely Piloted System, uses 114 nun (4-1/2inch) conventional flush joint tubing and is designed to drill for many kilometers (miles) with high three dimensional accuracy. Both systems incorporate Control While Drilling of the radial and provide real-time acquisition and display of drill performance with derived formation properties.

Introduction

About ten years ago, Petrolphysics and its partner Bechtel began the development of the Ultrashort Radius Radial System. That water jet drilling system is described in several previous publications, among them References 1-8. Two water jet drilling systems have been developed for different applications and trajectories.

The first system, the Ultrashort Radius Radial System (URRS), is an extended completion or recompletion system built around 32 nun (1-1/4 inch) coiled tubing and designed to provide 30 to 60 m (100 to 200 foot) radials on one or several levels within a single vertical well. integrated with the water jet drilling technologies in the URRS are real-time data acquisition, data analysis and interpretation, and open/closed loop control while drilling systems. This platform provides a powerful information system interface through which a multitude of operational data is channeled to a single operator for realtime qualitative and quantitative analyses of the drilling process. Combined with a time-window display and database of past drilling information, the system facilitates immediate well management decisions and solutions to difficult problems as related to the drilling process. (Figures 1 and 2.)

The second system, the Remotely Piloted System (RPS), is also designed to provide multiple radials but at trajectories of up to several miles in length. The RPS is built around 114 nun (4-1/2 inch) screwed flush joint tubing and incorporates a removeable inner 63.5 mm (2-1/2 inch) Drilling and Control Module (DCM) which may be removed and replaced by coiled tubing or sucker rods without tripping the outer 114 nun (4-1/2 inch) drillstring.

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