6 Reservoir Engineering - Resources for my University of Trinidad … Reservoir... · Functions OF RESERVOIR ENGINEERING To continuously monitor the reservoir and collect relevant

INST212D

RESERVOIR ENGINEERING

Reservoir Engineering

Learning Objectives of Day 2:

� Basic concerns of Reservoir Engineering

� Scope of Reservoir engineering

� Basic concepts and operating variables

� Tolls of reservoir engineering

� Terminology for MBE calculations

DEFINITIONs OF

RESERVOIR ENGINEERING

Colhoun “The phase of engineering

which deals with the transfer of

fluids to, from or through the

reservoirs“.

Functions OF RESERVOIR

ENGINEERING

To continuously monitor the reservoir and collect relevant data and interpret it to be able to

1. Determine (present conditions))

2. Estimate ( future conditions) and

3. Control

the movement of fluids through the reservoir so that

Objectives of reservoir

engineering

a) To enhance ( increase recovery

factor) and

b) To accelerate ( increase production

rate)

the oil recovery

Types of reservoir energy

1. - Energy of compression of water and rock within the reservoir

2. - Energy of compression of oil within the reservoir

3. - Energy of compression of gas within the reservoir

4. - Energy of compression of water that are in adjacent or underlying aquifers

Types of reservoir energy

5. The gravitational energy that

causes oil and gas to segregate

within the reservoir

6. The surface energy manifesting

itself in capillary pores

Producing mechanismsbased on dominant reservoir energy being released

Common special

Depletion

drive

Gas cap

drive

imbibition compaction

Solution

Gas drive

Full Partial

Segregating Nonsegregating

Water drive Combination drive

Formation

driveI.Edge

II.Bottom

I.Edge

II.Bottom

gravity

Basic concerns of reservoir engineers

(i.e.Reservoir engineer has to

continuously answer:)

1. To calculate the volume of the initial

hydrocarbon present in the

reservoir ?

2. How much of the initial fluids have

been recovered ?

3. How much is left ?

Reservoir engineer has to

continuously answer:

4. How can we increase recovery

economically?

5. What data are needed to answer the

questions?

Reservoir engineer has to

continuously answer:

7. How can I measure the performance

of the reservoir?

8. How can I improve the

performance?

Scope of Reservoir engineering:

Reservoir engineer has to understand

(1) the nature of reservoir fluids

(2) the nature of reservoir rocks

` `(3)the nature and behavior of rock

fluid systems

Scope of Reservoir engineering:

In dealing with rock fluid systems we

have

basic concepts and

operating variables.

Basic concepts are: multiphase fluid

flow, capillary behavior and fluid

displacement are to name a few.

Scope of Reservoir engineering:

Operating variables are:

geometrical configuration of the rock-fluid system, i.e.

spacing of wells

boundary conditions of flow, i.e. rates at which oil is

produced or pressure allowed to change in the well

Types and characters of the reservoir fluids involved, i.e.

amount of gas space allowed to develop, the water

injected or relative viscosities of oil and water

The sequence of operations undertaken,.i.e. whether

pressure depletion is permitted before or after

injection of water

Tools of Reservoir engineering:

Under the influence of these

operating variables, answering the

previous questions requires material

balance calculations and

performance evaluations i.e

predictions and interpretations.

Tools of Reservoir engineering:

Among the predictive and

interpretation tools available are

simple MBE equation (zero

dimensional), frontal advance

equation (1D), numerical

simulators.