文档介绍：Hydraulics Applications
PERFORM
Objectives
Provide basic understanding of Mud Rheology and models
Provide basic understanding and application of drillstring hydraulics
Hydraulics Software
Tools to estimate pressure losses
4 Rheological Models
Bit and Reamer Nozzle Selection and Optimization
Pressure Loss Calculations for MWD/LWD Tools
Motor Performance
Extended Circulating Capacities
Choke lines, Riserless Drilling, Mudlift
Hole Cleaning Efficiency
Swab and Surge Pressure Calculation
Necessary Software Features
Feature Benefit
Pressure Drop Analysis
Better representation of low shear rate behavior
Better transition to turbulence
MWD/LWD tools modeled
Bit Optimization
WHERE DID ALL MY PUMP PRESSURE GO?
Cuttings Transport
Semi-empirical model valid for deviated/horizontal wellbores
Critical flowrate, well section and deviation calculated
Sensitivity to ROP
Pipe eccentricity and rotation
Motor Performance
“PowerDrilling” supported
Stall Toggle
Sensitivity to WOB, DTOR or pressure drop
Bearing thrust balance
Volumetric Analysis
Circulation up riser or chokeline
Variations with pump flowrate
Purposes
Control formation pressures
Drive motor/turbine
Provide wellbore stability
Cool the bit
Clean cuttings from the hole bottom
Clean cuttings from the bit
Transport cuttings to surface
Drilling Fluid Circulation
Bit Hydraulics
PStdpipe=.+PDrill String+PMWD/Motor+PBit+PAnnulus
Pressure Losses
Surface Equipment
Standpipe
Kelly Hose
Swivel
Kelly
Drill String
Pipe
Collars
BHA
Motor/Turbine/MWD/LWD
Bit Nozzles
Annulus
Drill String
Pipe
Collars
BHA
Surface Equipment
Standpipe
Kelly Hose
Swivel
Kelly
Motor/Turbine/MWD/LWD
Bit Nozzles
Annulus
Pressure Losses
Surface Equipment
Case 1
Smallest land rigs
Case 2
Most land rigs
Case 3
Most Offshore rigs
Case 4
Deepwater rigs/floaters
User Specified
Types of Hydraulics Models
Newtonian
Follow a linear relationship between shear stress and shear rate
Viscosity is a constant (Air, wa