Pressure needed to reduce microannulus effect on CBL

Journal Article · Mon May 30 00:00:00 EDT 1988 · Oil Gas J.; (United States)

OSTI ID:7121376

Pilkington, P E

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.

• Research Organization: Conoco Inc., Houston, TX (US)
• OSTI ID: 7121376
• Journal Information: Oil Gas J.; (United States), Vol. 86:22
• Country of Publication: United States
• Language: English

Related Subjects

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