Abstract

A phenolic resin plugback technique was developed and successfully employed on thirty-two wellbores with open hole gravel packed completions in the Midway-Sunset field during 1987. This program resulted in a sustained water production decrease of 5,850 BWPD and an oil production increase of 256 BOPD. Total revenue and savings from the wellbore plugback project were estimated at $970,790 per year. plugback project were estimated at $970,790 per year. The project paid out in 120 days. This Paper will address the development, implementation, and results of this water control technique. This study demonstrates that control of water production is possible within an open hole gravel packed completion with the use of a phenolic resin. Successful placement of phenolic plugs in temperature environments ranging from phenolic plugs in temperature environments ranging from 100 degrees F to 200 degrees F were obtained. Influence of this program on wells immediately offsetting the water shut-off wellbores is reviewed.

Introduction

During the in-field development of the victory properties in 1986, an area of high water production properties in 1986, an area of high water production was encountered across two adjoining leases. Reservoir engineering and geology personnel theorized that a water channel existed within the reservoir previously thought to be oil productive. This water channel occurred within transitional and lower resistivity sands at the base of the reservoir. These sands ranged from 20 to 80 ohms in resistivity.

There was also speculation that bottom water could be migrating up through the gravel packed completion. An in-house reserves development study addressed the need for water shut off control within this thermal enhanced oil recovery (TEOR) environment.

Operations and Completion Engineering began evaluation of methods suitable for water shut off within openhole gravel packed slotted liners. Success with conventional Class "G" cementing for water shutoff was marginal within the area. A phenolic resin plugback technique was developed and successfully plugback technique was developed and successfully utilized on thirty-two cyclic steam injection wellbores in 1987. These workovers resulted in reduced water production of approximately 5,850 barrels per day and production of approximately 5,850 barrels per day and an oil production gain of 256 barrels per day for over three years. This paper will address the development, implementation, and results of this water control technique.

Background

The victory properties (Anderson, Anderson-Goodwin and Neely leases) are located within the Midway-Sunset (MWSS) field.

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