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Alternative Means to Frac Before a Gravel Pack

IP.com Disclosure Number: IPCOM000124468D
Publication Date: 2005-Apr-21
Document File: 3 page(s) / 583K

Publishing Venue

The IP.com Prior Art Database

Abstract

A specially designed tool string is run into the well. The inner string is an open flow path so that once the entire assembly is in position the fracturing treatment can be pumped down the tubing and washpipe instead of out the crossover. Once the fracturing treatment has been completed, the assembly is moved down into the gravel pack position and a gravel pack is performed.

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Title:              Alternative Means to Frac Before a Gravel Pack

Author:          Raymond J. Tibbles

 

Introduction

Historically, frac packing has utilized tools that were designed for gravel packing but modified to handle the higher rates and gravel volumes which are used in a frac pack treatment.  Because of this, the maximum rate and sand volumes that can be used in treatments have been limited.  The limits are caused by erosional limits of the service tools.  The proposed alternative approach uses the flow path down the washpipe to perform the fracturing operations which helps eliminate the erosion in the crossover port and allows for much higher gravel volumes and injection rates.

Summary

A specially designed tool string is run into the well.  The inner string is an open flow path so that once the entire assembly is in position the fracturing treatment can be pumped down the tubing and washpipe instead of out the crossover.  Once the fracturing treatment has been completed, the assembly is moved down into the gravel pack position and a gravel pack is performed.

Detailed Description

Figure 1 contains the standard procedure for gravel packing.  Note that all the slurry must cross over from the tubing to the annulus through a series of ports.  This crossover area is where much of the erosion occurs and limits the maximum rate and proppant volume that can be used in a frac pack treatment.  In the design depicted in Figure 2, the tool string would be positioned above the pef...