Abstract

The purpose of this paper is to reevaluate the stimulation procedures used in the Morrow Sand formation of Southeast New Mexico, and to improve these techniques based on current and new information.

This study considers the geological aspects of the Morrow Sand using the scanning electron microscope to investigate each Morrow rock type to determine rock properties and composition. The use of DST information is employed to establish pre-stimulation conditions involving transmissibility, BHP, damage ratio and productivity.

A study of fracturing fluids is presented investigating adsorption, clay presented investigating adsorption, clay swelling, compatibility and regained permeabilities with various Morrow rock permeabilities with various Morrow rock types. Fracturing techniques are evaluated using reservoir, DST, log, and fluid data to compare sand placement with thin and viscous fluids, sand concentrations, fracture length, fracture length and stabilized production increases. production increases. Conclusions based on previous work and this study indicate fracture stimulation with viscous gels improves Morrow Sand production.

Introduction

Prior to the late 1960's, the only morrow production in Southeast New Mexico was from wells having sufficient permeability to be completed naturally. permeability to be completed naturally. Stimulation attempts during this period utilized oil-base fluids or saturated brines with little or no increase in production. The first successful production. The first successful stimulation treatments consisted of aqueous potassium chloride solutions gelled with potassium chloride solutions gelled with guar, buffered for low pH, and incorporated a surfactant for low surface tension. The proppant used in these treatments was 20–40 mesh sand and 20–40 mesh glass beads.

In the early 1970's, use of a viscous crosslinked gel system and large sand concentrations proved successful for penetrating through wellbore damage. A typical treatment was 10,000 gallons of crosslinked guar carrying 18,000 pounds 20–40 mesh sand at 10 BPM. pounds 20–40 mesh sand at 10 BPM.

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