Enhanced recovery

Analysis, Skin Calculation With Dual-Method Stimulation Enhances Gas Production

This study explores enhancing gas production through a novel combination of prestimulation using a coiled tubing unit and high-rate matrix acidizing.

Fig. 1—Initial gas rate vs. EUR analysis.
Fig. 1—Initial gas rate vs. EUR analysis.
Source: SPE 224887.

The primary objective of this paper is to address formation damage and improve near-wellbore permeability by designing an effective stimulation treatment. This approach incorporates insights gained from skin analysis using inflow-performance-relationship models and a comprehensive initial reservoir-pressure simulation to determine optimal conditions. The study explores enhancing gas production through a novel combination of prestimulation using a coiled tubing unit and high‑rate matrix acidizing.

Introduction

MAS Field Overview. MAS field, a shallow lean-gas opportunity, is approximately 22 km from gas-gathering Station A. The field is producing from the NATH-A formation. The initial reservoir pressure is 115 bar and initial reservoir temperature is 80°C. Currently, the field has four horizontal wells (MAS‑1, MAS-2, MAS-3, and MAS-4).

The formation consists of normal marine carbonates deposited in a shallow, somewhat restricted shelf environment, with deeper open marine carbonates accumulating during periods of marine transgression.

Reservoir quality primarily is influenced by four key factors: the initial depositional fabric, the dissolution of allochems leading to the formation of vugs, neomorphism and cementation (particularly the formation of calcite nodules), and the precipitation of pore-filling cements.

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