first Flashcards
What is net sand thickness
Discribe the linearity of the closed reservoir of arbitrary geometry PSSF equation
what is the log log method for a gas well build up test
what is “L” when calcualting two point derivative
Describe sandface rate when production goes to 0 or increases fast
What is the equation for wellbore storage coeffcient
what is the gas flow equation and how does it compare to the oil flow equation
Any increase in flow capacity (kh) will cause the pressure derivative to deviate ____ from IARF profile
in a Gringarten-Bourdet Type Curve, well bore storage is has a _____ slove
What is the simulation / history matching process
A ____ boundary (no-flow or constant-pressure) can be appropriate ONLY if the well is MUCH closer to ONE BOUNDARY than to any other
What is a core analysis test in terms of alternate tests
What is the productivity index
When does IARF end and PSSF start for a Well In The Center Of A Closed Circular Reservoir
what is a linear constant pressure boundary
what is the manual log log analysis method for gas reservoir build up test
how does the use of adjusted pressure and adjusted time modify the diagnositic plot
What is the recommended procedure for drawdown semilog analysis with varying rates
What is the Horner Pseudoproducing Time Approximation
what is the procedure to do a gas well build up test semilog analysis
how do you determine the skin effect while using a Gringarten Type Curve
What is the equation for infinite acting radial flow
What is the Horner method
what is the symbol for real gas pseudopressure
Name an anomaly during Final Flowing Wellbore Pressure
What is the Equivalent-Time Method procedure for build up test analysis
What is the viscosity versus pressure graph for gas
when do you use p versus p2 during gas drawdown test
in between 2000 and 3000, there is no approximation, you need to calculate
What is the equation for steady state radial flow
What is PSS
The top equation is for ________
and the bottom equation is for _______
top = well bore storage
bottom = reservoir
in a Gringarten-Bourdet Type Curve, IARF has a _____ slope
what is the Ei function with dimensions
typed, arrow point
What is the wellbore flow equation for PSSF for a closed circular reservoir?
What is the recommended procedure for Reservoir Limits Test Analysis
Describe linear no-flow boundary
what is adjusted time
Radius of investigation is a function of what
what is TD
Dimensionless time
What is the Agarwal Equivalent-Time Method
Describe Circular Constant-Pressure Boundary
What is the formation volume factor versus pressure graph for gas
A Gringarten Type Curve has a ____ log-log plot
What is the viscosity versus pressure graph for water
The derivative for the IARF period all approach what?
1/2
Solution for ____Boundary condition can be solved using the method of image wells
What is the formation volume factor versus pressure graph for oil
What is total compressibility
What does PSSF begin
What is the MDH method
what is the symbol for adjusted pressure
pa
What is a drawdown test
Gas wells often exhibit rate dependent or ____ skin factor
What is an exploration well test
what is IARF
infinite acting radial flow
What is the principal of superposition in time
What is pore volume compressibility
________ are solutions to the diffusivity equation in dimensionless form displayed graphically.
what is the log log drawdown test procedure for a gas reservoir
What is the equation for fluid compressibility
ka > ko means the reservoir is what?
In a constant-rate drawdown test, the well is initially shut in, and the reservoir is at _______ pressure
The wellbore storage coefficient depends on what?
What are the assumptions for the Dietz & Ramey-Cobb Methods
What is a deliverability test
what are some observations of this data
What is the radius of investigation
what are the assumptions for a Gringarten-Bourdet Type Curve
In PDD, a unit-slope line in derivative suggests the presence of a _____reservoir, while in PBU, it happens only if the reservoir is not ____
What is a transient test
What is the Diffusivity equation for radial flow
ka < ko means the reservoir is what?
what are the types of well model for type curves
Any reduction in flow capacity will cause the pressure derivative to deviate ____ from IARF profile
Descripe pressure response for linear no flow boundary
what are the two steps to use Buildup Test Analysis using Drawdown Type Curves:
what are the types of inner boundary conditions for type curve models
What is a build up test
What is type curve matching in terms of interpretation methods
when matching up type curves during a drawdown test, ___ and ___ are calculated after matching up the x and y axis
k, CD –> C, and S
During pseudosteady-state flow from a closed reservoir, Pa and ta , may be used to predict gas-well behavior, provided the adjusted time is evaluated using fluid properties at _____ pressure as a function of time
What is formation volume factor?
Average reservoir pressure can be calculated using conventional material balance, p/z vs Gp , if the reservoir ______ and _____ are known.
What is the inverse problem
what is the two point method to calcualte derivative
What is the forward problem
describe closed circular reservoir
what is the semi-log drawdown test procedure for a gas reservoir
• If the pressure changes during drawdown in less than 10% of the initial pressure, the ____ equation may be used with acceptable results.
What is the MBH Procedure for estimating Average Drainage-Area Pressure
How do you factor in varying rate during a drawdown test
What is the equation for steady state linear flow
what is psuedotime
The a larger difference between the Gringarten and Bourdet Type Curve indicates what?
more skin
What is a single well test
What is the wellbore pressure equation
what two things need replaced when using oil equations during gas drawdown tests
What is wireline formation testing in terms of alternate tests
How can we estimate three independent quantities (k, s, pi ) from a straight line on the Horner plot?
What is a log-derived permeability estimate in terms of alternate tests
What are some additional pressure drop equations due to permeability alteration
show the Gringarten-Bourdet type curve for damaged, undamaged, and stimulated wells
What is the formation volume factor versus pressure graph for water
What is the Ei function without dimensions
hand written
What is the straight line method in terms of interpretation methods
What is a rate transient test in terms of alternate tests
In practice, what is the best workflow for well test interpretation
During gas build-up tests, don’t forget to replace pressure and time with the _____pressure and adjusted time, respectively, and the oil properties with gas properties evaluated at _______
what are the types of outer boundary conditions for type curve models
The best fit of a type curve can be used to calculate ____, ____, ______, _____, or other reservoir properties
For Gringarten Type Curve, CDe2s reflects effects of ____ and ____
wellbore storage and skin
What is well test interpretation
what is the bourdet three point method
What is the principal of superposition in terms of a buildup test
what is a Gringarten-Bourdet type curve
______ means the pressure gradients in the reservoir are small enough – reservoir pressure may be treated as uniform throughout the reservoir
how do you do a manual log log analysis
What is the completion efficiency ratio
What is the effect of flow rate on the radius of investigation
what is the manual log log analysis for a gas reservoir
The pseudopressure and the adjusted pressure depend only on:
When does IARF end?
What is the Diffusivity equation for 1D linear flow
What is a development well test
What is the Dietz method procedure
What is the Horner method
what are the types of reservoir media for type curve models
What does the MBH pressure function graph look like for a 2x1 square
what is the adjusted pressure equation used during a gas well build up test semilog analysis
What is the equation for a closed reservoir of arbitrary geometry under PSSF?
What are the simplist boundary models
What is a multi well test
what is the equation for adjusted pressure
What is the principal of superposition in space
The Bourdet derivative is a _____ derivative
logarithmic
What is the MBH method?
• Many physical reservoir boundaries give similar ____ response and requires additional data to confirm the boundary type
What is the viscosity versus pressure graph for oil
Use Gringarten-Bourdet type curve for build up test if:
Describe pressure response for linear constant pressure boundary
what is the least square curve fitting method
What is a permanent monitoring test in terms of alternate tests
What is the pressure profile equation for a drawdown test
what are the 3 types of reservoir boundaries
What is Darcy’s law
what is CD
dimensionless wellbore storage
How do you linearize a drawdown test graph and what equatiosn results
