METHOD OF PERFORMING FORMATION TESTING OPERATIONS

Description

RELATED APPLICATIONS

This application claims priority to and the benefit of a U.S. Provisional application having Ser. No. 63/013,498, filed Apr. 21, 2020, which is incorporated by reference herein.

BACKGROUND

It is often beneficial to perform downhole operations, such as deep transient testing, sampling, fluid analysis, or the like on a reservoir. Often the operation requires multiple packers connected with a wireline toolstring to isolate a zone of interest. However, it is desirable to be able to perform a downhole operation with a single isolation packer.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of this disclosure may be better understood upon reading the following detailed description and upon reference to the drawings in which:

FIG. 1 depicts a schematic of a system to perform a downhole operation.

DETAILED DESCRIPTION

Various aspects of this disclosure may be better understood upon reading the following detailed description and upon reference to the drawings in which:

FIG. 1 depicts a schematic of a system to perform a downhole operation. A wireline toolstring 110 can be disposed in a wellbore 102. The wireline toolstring can include a plurality of wireline tools. The wireline toolstring can be configured to do fluid sampling, such as one described in U.S. Pat. No. 8,967,253, which is incorporated herein in its entirety. The wireline tools making part of the toolstring can be commercially available tools or future known wireline tools, that can be used to perform downhole operations. The downhole operations can be deep transient testing, fluid sampling, or fluid analysis. One skilled in the art with the aid of this disclosure would know what wireline tools and types of operations that can be performed using the disclosed methods.

The wireline toolstring 110 has a single packer 112. The toolstring 110 can include other wireline modules or tools needed to perform a desired operation. The packer 112 can be a now known or a future known packer. The toolstring 110 can be positioned in the wellbore such that the packer 112 is adjacent to a zone of interest 120. The zone of interest 120 can be a perforated zone, as shown, or an open hole zone or fractured zone or similar zone of the formation. On an opposite side of the zone of interest 120 is located a downhole barrier 130. The downhole barrier can be installed in the wellbore prior to deployment of the wireline toolstring. The downhole barrier can be a bridge plug, cement plug, or the like.

In operation, the barrier 130 can be operatively located in the wellbore and set in place adjacent a portion of the zone of interest 120. In one or more embodiments, the zone of interest can be perforated, using now know or future known methods and tools for perforating casing. After the zone of interest in perforated, the wireline toolstring 110 can be conveyed into the wellbore. Any now known or future known device can be used for conveyance, examples of devices include wireline, drill pipes, or the like.

The wireline toolstring is then lowered to a desired location where the packer is located adjacent the end of the zone of interest opposite the barrier. The packer can then be set, thereby isolating the zone of interest via the packer and the barrier.

The wireline tool and wireline toolstring is used to perform wireline operations. The wireline operations can include sampling, DFA, transient testing, other now know wireline operations or future known wireline operations. For example, during sampling pump modules that are part of the toolstring and/or wireline tool can be operated to draw fluid into a fluid analyzer of the wireline tool. The fluid drawn into the fluid analyzer is fluid from the formation located between the inflatable packer and the plug. After completion of the wireline operation, the isolation packer is deflated and the wireline tool and toolstring is are brought back to surface.

In one or more embodiments, the method can include placing a barrier, such as a retrievable bridge plug, adjacent an end of a zone of interest that has been cased and perforated. The barrier can be placed below the perforations. A toolstring that has one or more tools, such as a transient testing formation testing tool, wireline formation tester, a single packer, and/or the like, is positioned on the retrievable plug or stationed just above it. The toolstring can be conveyed into the wellbore and positioned on the retrievable plug or just above it using wireline, pipe, or the like. The toolstring will be positioned depending on the location of the single packer on the toolstring. The toolstring will be positioned in the wellbore such that the zone of interest is between the single packer and the barrier. Fluid can then be drawn from the formation into the zone of interest between the packer and the barrier, and the fluid can be pumped out of the interval using the toolstring or a tool in the toolstring such as a formation testing tool. The fluid can then be expelled to the wellbore or circulated to surface. The disclosed method can be used for formation testing operations including sample collection, downhole fluid analysis, and/or transient data analysis.