Abstract

This paper describes the application of current technology to drill linerholes with conventional bits in Roger Mills County, Oklahoma. A re-evaluation of the parameters to drill liner holes (6" and above) with a conventionalbit vs. a downhole motor has reduced drilling costs by $10 to $20 per foot. Using a good bit hydraulics program and the hand held computer has changedliner hole drilling standards for us in this area.

Introduction

Roger Mills County, Oklahoma is located on the Texas, Oklahoma border. Drilling activity in this area began in the late 1970's. There are severalzones of interest, the Prue, Skinner, Lower Red Fork and Upper Red Fork. These sandstone formations range in depths between 11,000 ft. to 14,000 ft. The paythickness is 10 to 100 ft. with permeabilities up to 0.5 md. Reservoir pressures are as high as 11,000 psi.

Background

As a starting point, a review of the drilling fluids and casing strings will help compare with other drilling programs and to understand the application of using a bit hydraulics program. Intermediate casing point is drilled with a 9.0to 9.5 lb/gal fresh water, low solid, non dispersed to lightly dispersed system. The funnel viscosities are 30 to 40 sec./quart, yield points are 0 to 15 lbs/100 ft2 and the plastic viscosities range between 1 to 10 cp.

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