Variations in hydraulic lift with diamond bits

Conference · Wed Sep 01 04:00:00 EDT 1982 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5396010

Winters, W J

The total pressure beneath natural diamond bits often exceeds 1000 psi. This results in a sizable lifting force on the bit face. The true bottomhole load between the bit and rock can be less than half of the weight-on-bit indicated at the surface. Hydraulic lift is a significant force that must be accounted for in both laboratory and field evaluations of diamond bits. A review of the literature showed that no convenient, reliable method had been developed for measuring or estimating hydraulic lift. Two practical methods for determining hydraulic lift were developed in a laboratory drilling study, and are described in this paper. The ''drill-off'' method is well-adapted for routine application at the rig site. The ''drilling'' method yields additional details about hydraulic lift under controlled laboratory conditions. Sizable differences in hydraulic lift with similar bits are explained. It is shown that each diamond bit may be characterized by its ''effective pump-off'' and ''apparent nozzle'' areas. These are design-related characteristics that may be determined from directly measurable drilling parameters. Variations in hydraulic lift may then be predicted under a wide range of conditions.

• Research Organization: Amoco Production Co.
• OSTI ID: 5396010
• Report Number(s): CONF-820927-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE10960
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BENCH-SCALE EXPERIMENTS
CARBON
DESIGN
DIAMONDS
DRILL BITS
DRILLING
DRILLING EQUIPMENT
DYNAMIC LOADS
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
FLUID MECHANICS
HYDRAULICS
MEASURING METHODS
MECHANICS
MINERALS
NATURAL GAS WELLS
NONMETALS
OIL WELLS
PARAMETRIC ANALYSIS
PERFORMANCE
PRESSURE DROP
PRESSURE MEASUREMENT
RESERVOIR ROCK
WELL DRILLING
WELLS