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Title: Pressure needed to reduce microannulus effect on CBL

Abstract

Four different types of microannuluses can invalidate cement bond logs, but there are ways to cope with them and obtain valid logs. Only one is a rule-of-thumb procedure. The others are better ways to determine the pressure required for eliminating any microannulus effect. The microannulus effect on cement bond logs, CBL, has long been recognized. Various authors have presented rules-of-thumb to eliminate the microannulus effect so that a properly centered, calibrated, and gated tool can yield a valid cement bond log. This article reviews the various causes of the microannulus and discusses what surface pressure is required to minimize the microannulus effect on the CBL of thermal, produced, induced, and squeeze microannuluses. The unique problem of handling the microannulus in floating drilling operations is another subject.

Authors:
Publication Date:
Research Org.:
Conoco Inc., Houston, TX (US)
OSTI Identifier:
7121376
Resource Type:
Journal Article
Journal Name:
Oil Gas J.; (United States)
Additional Journal Information:
Journal Volume: 86:22
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; CEMENTS; BINDING ENERGY; CEMENTING; OIL WELLS; MONITORING; MONITORS; NATURAL GAS WELLS; OFFSHORE PLATFORMS; PRESSURE DEPENDENCE; BUILDING MATERIALS; ENERGY; MATERIALS; MEASURING INSTRUMENTS; WELLS; 020300* - Petroleum- Drilling & Production; 030300 - Natural Gas- Drilling, Production, & Processing

Citation Formats

Pilkington, P E. Pressure needed to reduce microannulus effect on CBL. United States: N. p., 1988. Web.
Pilkington, P E. Pressure needed to reduce microannulus effect on CBL. United States.
Pilkington, P E. 1988. "Pressure needed to reduce microannulus effect on CBL". United States.
@article{osti_7121376,
title = {Pressure needed to reduce microannulus effect on CBL},
author = {Pilkington, P E},
abstractNote = {Four different types of microannuluses can invalidate cement bond logs, but there are ways to cope with them and obtain valid logs. Only one is a rule-of-thumb procedure. The others are better ways to determine the pressure required for eliminating any microannulus effect. The microannulus effect on cement bond logs, CBL, has long been recognized. Various authors have presented rules-of-thumb to eliminate the microannulus effect so that a properly centered, calibrated, and gated tool can yield a valid cement bond log. This article reviews the various causes of the microannulus and discusses what surface pressure is required to minimize the microannulus effect on the CBL of thermal, produced, induced, and squeeze microannuluses. The unique problem of handling the microannulus in floating drilling operations is another subject.},
doi = {},
url = {https://www.osti.gov/biblio/7121376}, journal = {Oil Gas J.; (United States)},
number = ,
volume = 86:22,
place = {United States},
year = {Mon May 30 00:00:00 EDT 1988},
month = {Mon May 30 00:00:00 EDT 1988}
}