Deepwater Gas-Zone Shutoffs With Wireline in Openhole-Gravel-Pack Completions

Fig. 2—Sketch of flow-path modeling for GSO proof of concept.

An operator successfully executed two wireline through-tubing gas-shutoff (GSO) workovers in high-angle openhole-gravel-pack (OHGP) completions to isolate high-gas/oil-ratio (HGOR) zones, resulting in significantly increased oil production. This paper summarizes the GSO concept, completion modeling, job planning, completion-equipment testing, job execution, and production results from one of these two wells (the processes and results associated with the second well are detailed in the complete paper).

Introduction

All producers in the field of study were drilled from a 36-slot tension-leg platform (TLP) at a water depth of just over 1000 m. OHGPs are the preferred completion option in this field. It was recognized during the project-design phase that controlling unwanted gas and water in the future would be challenging. The well-work solution proposed and described in this paper can address that challenge by providing lower-GOR oil and additional reserves recovery.

Although the long-term depletion plans for most reservoirs in the field rely on waterflooding, some producing reservoirs have been used to store surplus gas until gas-export facilities were operational. As these injected gas caps expanded toward producers, GORs increased to the point at which processing facilities were gas constrained. Producer-well seriatims made on the basis of GOR are used to optimize oil production. The highest-GOR wells are typically cycled to manage GORs and then shut in when cycling is no longer effective.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 170789, “Deepwater Gas-Zone Shutoffs With Wireline in Openhole-Gravel-Pack Completions,” by Claudia Zettner, Hank Bensmiller, and Tom Lane,ExxonMobil, prepared for the 2014 SPE Annual Technical Conference and Exhibition, Amsterdam, 27–29 October. The paper has not been peer reviewed.
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Deepwater Gas-Zone Shutoffs With Wireline in Openhole-Gravel-Pack Completions

01 May 2015

Volume: 67 | Issue: 5

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