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Multi-probe pressure test

a pressure test and multi-probe technology, applied in the field of hydrocarbon exploration and production of wellbores, can solve the problems of unrepresentative samples having altered fluid properties, unable to easily recombine evaporated components with the remaining portion of the sample, and minimal damage to the tested formations

Inactive Publication Date: 2008-06-26
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]FIG. 5 is a partial cut-away side view of a

Problems solved by technology

This sampling generally causes a minimum amount of damage to the tested formations.
Should some of the lighter ends of the sample evaporate, these evaporated components cannot be easily recombined with the remaining portion of the sample.
Thus even a sample with a small amount of evaporation results in an unrepresentative sample having altered fluid properties.
Often times however due to inherent uncertainties in wellbore measurements, the wellbore depth used in the pressure gradient calculation does not match the true vertical depth of where the measurements were obtained.
These uncertainties are not limited to inaccurate true vertical depth readings, but extend also to incorrect differences in depth between adjacent measurement points, thereby resulting in an incorrect pressure gradient.

Method used

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Embodiment Construction

[0020]The apparatus and method described herein involves sampling subterranean connate fluid from within a formation that has been pierced by a wellbore. As is known, drilling subterranean wellbores produces a wall of mud cake is formed on the outer periphery of the wellbore. This wall generally extends along the length of the wellbore. Additionally, due to the drilling operations as well as drilling fluids introduced during drilling, large amounts of particulate matter may be contained within the connate fluid within the formation.

[0021]With reference now to FIG. 2 one embodiment of a portion of a downhole tool 16 is shown in a side view. The downhole tool 16 is shown disposed within a wellbore 18, where the wellbore 18 is in a cross sectional view. A layer of mudcake 22 is shown on the outer periphery of the wellbore 18. In this embodiment, the sampling tool 16 comprises sample probes (24, 28, 32, 36, and 40) disposed along the length of the tool 16. Each probe (24, 28, 32, 36, an...

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Abstract

A method and device for determining a formation gradient. The device comprises probes that are a set distance apart, disposing the device into a wellbore and measuring formation pressure with the probes provides formation pressures that can be correlated with the set distance. The measured pressures and correlated set distance is used to determine the formation gradient.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates generally to the field of exploration and production of hydrocarbons from wellbores. More specifically, the present invention relates to an apparatus and method for sampling connate fluid from a subterranean formation.[0003]2. Description of Related Art[0004]Sampling fluids entrained within a subterranean formation is one way of obtaining hydrocarbon producing potential of the formation. These fluids, also referred to as connate fluid, are typically analyzed in a laboratory. This sampling generally causes a minimum amount of damage to the tested formations. Additionally, a continuous record of the control and sequence of events during the test is made at the surface. From this record, valuable formation pressure and permeability data as well as data determinative of fluid compressibility, density and relative viscosity can be obtained for formation reservoir analysis.[0005]Generally connate fluid s...

Claims

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Application Information

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IPC IPC(8): E21B49/08
CPCE21B49/088
Inventor GORDON, ROBERT J.SHAMMAI, MICHAEL
Owner BAKER HUGHES INC