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Method of miscible injection testing of oil wells and system thereof

A tested fluid injection technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of small reservoir volume, imperfection, insufficient results, etc.

Inactive Publication Date: 2011-04-13
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, core and open hole wireline formation testing are known, but these methods sample relatively small reservoir volumes, which often lead to inadequate or incomplete results

Method used

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  • Method of miscible injection testing of oil wells and system thereof
  • Method of miscible injection testing of oil wells and system thereof
  • Method of miscible injection testing of oil wells and system thereof

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Embodiment Construction

[0022] Transient well pressures are analyzed to determine reservoir permeability and geometry of subsurface formations. The instantaneous well pressure is provided by one or more downhole pressure gauges measured and recorded down the borehole. figure 1 An example of implementing a reservoir permeability and geometry testing method that implements certain aspects of a well pressure model is shown. The method generally begins at step 105 with determining reservoir permeability and geometry of a subterranean formation having a reservoir fluid comprising oil that has not been previously injected with water. In some embodiments, a hollow tube called drill pipe is lowered from the wellhead into the well. The wellhead is the surface end of the wellbore. The drill pipe has two expandable devices, called packers, surrounding it. The drill pipe is lowered into the borehole, or down the well, until a first packer is positioned just above the subterranean formation to be tested and a ...

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Abstract

A method of determining reservoir permeability and geometry of a subterranean formation having a reservoir fluid including oil that has not been previously water-flooded includes isolating the subterranean formation to be tested; providing an injection fluid at a substantially constant rate from a wellhead to the formation being tested, wherein the injection fluid is miscible with the oil at the tested formation; sealing, at the top, the tested formation from further fluid injection; measuring pressure data in the tested formation including pressure injection data and pressure falloff data; and determining the reservoir permeability and geometry of the tested formation based on an analysis of the measured pressure injection data and the measured pressure falloff data using a well pressure model.

Description

technical field [0001] The present invention relates generally to the productivity and geometrical characteristics of oil-bearing intervals in a well, and more particularly to an automated analysis of short-duration tests that do not require oil production to surface. Background technique [0002] An example of a commonly used oil surface process for flow testing is the drill stem test (DST). In this type of flow testing, the production capacity, pressure, permeability or extent of a reservoir of oil or natural gas is determined. DST testing is essentially a flow test that is performed on isolated target rock formations to determine fluid reserves and their likely production rates. A typical DST includes multiple periods of flow and shut-in (or pressure build-up) during which data from the reservoir is recorded. [0003] Alternatives to oil surface processes for flow testing exist but have their own inherent drawbacks and drawbacks. For example, core and open hole wirelin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/008
Inventor J·弗尔克
Owner CHEVROU USA INC