Downhole characterization of formation pressure
US-2018371902-A1 · Dec 27, 2018 · US
Downhole characterization of formation pressure
US11162358B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11162358-B2 |
| Application number | US-201816014543-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 21, 2018 |
| Priority date | Jun 21, 2017 |
| Publication date | Nov 2, 2021 |
| Grant date | Nov 2, 2021 |
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Abstract
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A method includes operating a downhole acquisition tool in a wellbore in a geological formation and performing formation testing using the downhole acquisition tool in the wellbore to determine at least one measurement associated within the geological formation, the wellbore, or both. The downhole acquisition tool includes one or more sensors that may detect the at least one measurement and the at least one measurement includes formation pressure, wellbore pressure, or both. The method also includes using a processor of the downhole acquisition tool to obtain a response characteristic associated with the formation, the wellbore, or both based on oscillations in the at least one measurement and determining at least one petrophysical property of the geological formation, the wellbore, or both, based on the response characteristic. The petrophysical property includes permeability, mud filter cake permeability, or both.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of doing pressure testing in a well comprising: operating a downhole acquisition tool in a wellbore in a geological formation; performing formation testing by extending a probe through a mud filter cake to engage the formation and performing a formation pressure test with the probe to obtain formation build-up pressure data, and using a sensor in the downhole acquisition tool to measure wellbore pressure and obtain wellbore pressure data; using a processor of the downhole acquisition tool to: determine spectral characteristics of variations in the formation build-up pressure data and the wellbore pressure data in a time interval where flow regime occurs in formation build-up pressure data by removing background trends therefrom creating modified formation pressure data and modified wellbore pressure data, wherein the spectral characteristics comprise a frequency response of the formation build-up pressure data, and wherein the frequency response is a transfer function according to the following relationship: T _ ( s ) = K 0 ( s D m r w ) K 0 ( s D m r m ) K 0 ( s D f r w ) K 0 ( s D f r w ) + f _ ( s ) g _ ( s ) { I 0 ( s D m r m ) K 0 ( s D m r m
Assignees
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Classifications
- E21B49/088Primary
combined with sampling · CPC title
with means for conveying samples through pipe to surface · CPC title
Measuring temperature or pressure · CPC title
- E21B49/008Primary
by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor (measuring pressure E21B47/06) · CPC title
determining specific fluid parameters · CPC title
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- What does patent US11162358B2 cover?
- A method includes operating a downhole acquisition tool in a wellbore in a geological formation and performing formation testing using the downhole acquisition tool in the wellbore to determine at least one measurement associated within the geological formation, the wellbore, or both. The downhole acquisition tool includes one or more sensors that may detect the at least one measurement and the…
- Who is the assignee on this patent?
- Schlumberger Technology Corp
- What technology area does this patent fall under?
- Primary CPC classification E21B49/088. Mapped technology areas include Fixed Constructions.
- When was this patent published?
- Publication date Tue Nov 02 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).