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Focused Sampling Probe

IP.com Disclosure Number: IPCOM000188444D
Publication Date: 2009-Oct-07
Document File: 5 page(s) / 179K

Publishing Venue

The IP.com Prior Art Database

Abstract

A tool with a packer element that is inflated with annulus mud fluid to seal against the wellbore and isolate one or more zones of the well from the annulus mud pressure for the purposes of obtaining both a pressure and fluid sample from those respective zones. Mud flow in the pipe provides the energy to operate a hydraulic pump used for both inflating the packer and removing fluid from the isolated portion of the wellbore. The pump can be operated from electrical energy produced by an alternator attached to a turbine driven shaft. Annulus pressure is routed to the packer from the hydraulic pump for inflating and deflating (pump can also produce a dP to keep the packer deflated). By using a single packer, there is no differential across the ends during the pressure and sampling process - the ends being the known weak area and subject to burst failure at pressure differentials similar to the overbalance experienced in the pressure and sampling process. The use of a flow area surrounding the probe area is to facilitate the removal of mud filtrate adjacent to the probe reducing the time required to achieve a clean, representative formation fluid sample. Standard probes for measuring formation pressure can be used with this tool for interference tests and assisting is identifying candidate formations for fluid sampling.

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Title of Invention: Focused sampling probe

Date of publication: October 7, 2009

Relates to an Inflatable Packer incorporating one or more probes and/or conduits for obtaining both a pressure measurement and/or a fluid sample from an underground well. This probe may be used in a downhole drilling tool or any tool.

In the drilling environment of the testing environment (mud circulation in a pipe), the packer prevent erosion of the mudcake near the probe and enhance the isolation between the wellbore and the formation.

Related Art

US 2,441,894


US 5,549,159 shows a packer with a plurality of inlets on it. See US 6,729,399.

The invention can be used while drilling (drill string with mud circulation, drill bit), while testing (drill string with fluid circulation, no drill bit), and may even be adapted for wireline operations. The sampling tool is a typical guarded sampling tool (see US 2006/0000603 for background)

This invention is a tool with a packer element that is inflated with annulus mud fluid to seal against the wellbore and isolate one or more zones of the well from the annulus mud pressure for the purposes of obtaining both a pressure and fluid sample from those respective zones. Mud flow in the pipe provides the energy to operate a hydraulic pump used for both inflating the packer and removing fluid from the isolated portion of the wellbore. The pump can be operated from electrical energy produced by an alternator attached to a turbine driven shaft. Annulus pressure is routed to the packer from the hydraulic pump for inflating and deflating (pump can also produce a dP to keep the packer deflated). By using a single packer, there is no differential across the ends during the pressure and sampling process - the ends being the known weak area and subject to burst failure at pressure differentials similar to the overbalance experienced in the pressure and sampling process. The use of a flow area surrounding the probe...