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Apparatus and Method for Mechanical Caliper Measurement During Logging-While-Tripping (LWT)

IP.com Disclosure Number: IPCOM000031774D
Publication Date: 2004-Oct-08
Document File: 1 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

Accurate borehole size and geometry information is mandatory for a large range of applications: - Data quality assessment and environmental corrections for all FE sensors, both conventional and novel; - the wellbore completion process, involving but not limited to optimized placement of casing hardware, such as centralizers etc., as well as accurate cement volume determination; - Determination of regional directional stress from borehole elongation and breakout information; - Assessment of suitability of drilling mud system, based on clay swelling or formation filter cake build-up; To determine borehole size and geometry, caliper measurements are available from a number of different wireline devices, utilizing either mechanical arms in contact with the borehole wall or acoustic pulse echo sensors. The acoustic pulse-echo methods currently in use are limited in terms of hole size coverage and its quality is depending on mud and formation conditions. With more and more deviated wells being logged with LWD sensors, an accurate and instantly caliper measurement with a suitable dynamic range is needed for the LWD environment. A wireline job can take place not until the drilling assembly was pulled out of hole. This can be quite a long time up to several days after the LWD job was carried out. This invention is about how to get an accurate and immediate assessment of borehole size and shape while tripping or while reaming out of hole with the drilling bottom hole assembly at a much earlier stage than with recent wire line services.

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414-38539-US

Accurate borehole size and geometry information is mandatory for a large range of applications: - Data quality assessment and environmental corrections for all FE sensors, both conventional and novel; - the wellbore completion process, involving but not limited to optimized placement of casing hardware, such as centralizers etc., as well as accurate cement volume determination; - Determination of regional directional stress from borehole elongation and breakout information; - Assessment of suitability of drilling mud system, based on clay swelling or formation filter cake build-up; To determine borehole size and geometry, caliper measurements are available from a number of different wireline devices, utilizing either mechanical arms in contact with the borehole wall or acoustic pulse echo sensors. The acoustic pulse-echo methods currently in use are limited in terms of hole size coverage and its quality is depending on mud and formation conditions. With more and more deviated wells being logged with LWD sensors, an accurate and instantly caliper measurement with a suitable dynamic range is needed for the LWD environment. A wireline job can take place not until the drilling assembly was pulled out of hole. This can be quite a long time up to several days after the LWD job was carried out. This invention is about how to get an accurate and immediate assessment of borehole size and shape while tripping or while reaming out of hole with the drilling bottom hole asse...