DRILLING

AND

WELL COMPLETION

LESSON OBJECTIVES

• At the end of this lesson you should be able to:

1. Understand the most important aspects of and key

drivers behind both standard and advanced drilling oil

and gas well.

2. Understand fundamentals of drilling processes for

completing onshore and offshore wells.

Contents

1. Introduction

1. Drilling Fundamentals –

i. Planning a well

ii. Data acquisition

3. Well Completion and Completion Techniques.

INTRODUCTION

• The definition of advance drilling encompasses

a range of new technologies that may be applied

individually or in combination:

o Horizontal well

o Extended or ultra reach wells

o Intelligent (“smart”) wells

o Coiled tubing drilling/reeled completion

o Underbalanced operation

o Multiple fractured horizontal wells.

Planning a well

• Gathering of all available data on past wells.

• Objectives of the well.

• Obtain a Geologic prognosis.

• Bit record and electric log.

• The drilling rig and power are adequately describe with the number, sizes and type of bit required.

• Casing sizes and depths.

• Pump pressure, bit jet sizes and pump strokes per minutes supposed to be prepared and calculate.

• Bit weigh and rotary speed are included with bit hours and condition.

• Basic mud design.

• The use of electric logs to determine

formation fracture gradients and pore

pressure, abnormal pore pressure or low

pressure.

• Basic mud design.

Example Drilling Program

• Refer to additional note (in hard copy).

• Assignment:

Develop Drilling Program from Macondo

Well Gulf of Mexico (each group supposed

to be proposed one drilling program – Max

5 pages).

WELL COMPLETION AND

COMPLETION TECHNIQUE

The Process of Well Completion Design

Includes the reasoning and functions that

must be performed to the specify

components required to complete a well.

Assignment-1

• Develop Completion Program from

Macondo Well Gulf of Mexico (each group

supposed to be proposed one Completion

program and max 5 pages only).

Assignment-2

There were four (4) productive zones in this well; it is required to accomplish bottom-

hole completions to produce well fluid from this well. Well completions would include

packers and Sub Surface Safety Valve (SSSV).

a) The information about these two productize zones are listed in the table.

What types of well completions can you install in this well? Draw the fully labelled

schematics of completion diagrams to illustrate the following production strategies

from:

i. Zone 1, 2 and 3 separately.

ii. Zone 1 and 2 commingle, zone 3 separately.

Productive zone and

depth

Reservoir Thickness, ft

Bottom hole pressure, psi

Perforation length, ft

Reservoir problem

1 – 4000 ft 10 2900 10 Gas conning

2– 4010 ft 10 3000 10 Sand production

3– 4020 ft 30 3500 30 Water Coning

b) The new layer of oil (layer 4) had been

discovered. The depth is shallow (3000ft).

The oil is heavy so it is preferred to be

drilled horizontally and produced separated

from other layers. The reservoir thickness is

10 ft and the perforated interval is 40 ft. The

other layers (1,2 and 3) has to be produced

commingle.

REFERENCES