Abstract

The Marine regions represent a significant portion of the total oil production in México. Sustaining oil production at current levels is a constant challenge; thus a large local operator is exploring unconventional methods in their quest to optimize rig utilization by implementing novel rigless work-over interventions.

One of the Marine Region most common interventions is production tubing clean-out. The objective of these interventions is the removal of deposits layers, asphaltenes and scale bridges in order to regain access to the producing intervals, and in some cases to eliminate the detrimental effect in production caused by reduced flow in scaled areas. Traditional clean-out methodology includes tubing conveyance, pumping of cleaning fluids and the operation of hydraulic or mechanical downhole tools.

E-line conveyed technology enables rigless clean-outs by mechanical removal of debris from production tubing, safety devices like SSSV and plug seats, saving deferred production and allowing the operator to optimize rig utilization. The cleaning tool run on a well tractor and e-line has proved to be a reliable and effective solution for clean-out applications.

E-line tractor assisted clean-out technology induces zero damage to the produced zone. The ability of removing debris from the wellbore without pumping a single drop of fluid into the well represents a major turnover into traditional workover approach. E-line conveyed clean-out enables operators to perform environmental friendly interventions, with reduced personnel and carbon footprint, enabling logistics optimization.

This paper examines these recent applications of through-tubing e-line conveyed well intervention solutions in Mexico's marine regions and presents the relevant well conditions and criteria used for selection. It provides case histories with operational challenges as well as the results of several successful, rig-less cleaning operations on an important producing wells.

Introduction

A large operator located in the Mexican marine region (Fig. 1), which is located in the the Gulf of Mexico, is responsible for maintaining nearly 75% of the overall oil production of Mexico

One of the major challenges that the marine regions face's is to minimize deferred production, therefore, they are continuously looking for workover alternatives that allows them to keep production at maximum levels.

Most of the wells in the fields of the marine region have carbonate scale building issues due to water production. Scale bridges across the production tubing restrict the access to the producing zones, creates downhole chokes with detrimental effects to production and may obstruct or even prevent correct functioning of subsurfarce safety valves.

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