Introduction

					 HORIZONTAL, DIRECTIONAL
AND MULTILATERAL DRILLING

     RICHARD CARDEN
         GSM, INC.
       PETROSKILLS


        © 2001 PetroSkills LLC, All Rights Reserved
               Introduction

    Attendance sheet
    Print your name as you want it to
     appear on your certificate
    It must be printed so that I can read it




2                © 2001 PetroSkills LLC, All Rights Reserved
               Introduction

    Business card holder
    Place your business card in the
     business card holder
    If you do not have a business card,
     use one of the blanks
    I will copy it and give a copy to each
     participant tomorrow



3                © 2001 PetroSkills LLC, All Rights Reserved
       INTRODUCTION
Directional drilling is the art and
science involving the intentional
  deflection of a wellbore in a
  specific direction in order to
reach a predetermined objective
 below the surface of the earth

           © 2001 PetroSkills LLC, All Rights Reserved
             Introduction

    At one time it was thought that
    all wells were vertical
    Methods to measure deviation
    were developed in the 1920’s
    (initially acid bottle)
    Directional drilling developed
    after 1929 when new survey
    instruments were available
    (inclination and direction)
5              © 2001 PetroSkills LLC, All Rights Reserved
             Introduction

    The first controlled directionally
    drilled well was drilled in the
    Huntington Beach Field in 1930
    to tap offshore reserves from
    land locations
    Directional drilling became more
    widely accepted after a relief well
    was drilled near Conroe, Texas
    in 1934

6              © 2001 PetroSkills LLC, All Rights Reserved
             Introduction

    Today, directional drilling is an
    integral part of the petroleum
    industry
    It enables oil companies to
    produce reserves that would not
    be possible without directional
    drilling


7              © 2001 PetroSkills LLC, All Rights Reserved
               Introduction

    One of the
    primary uses of
    directional
    drilling was to
    sidetrack a well
    even if it was to
    go around a
    stuck BHA


8                © 2001 PetroSkills LLC, All Rights Reserved
    Introduction

                                      Sometimes
                                      multiple sidetracks
                                      are used to better
                                      understand
                                      geology or to place
                                      the wellbore in a
                                      more favorable
                                      portion of the
                                      reservoir


9    © 2001 PetroSkills LLC, All Rights Reserved
                     Introduction
     Straight hole drilling
     is a special
     application of
     directional drilling
     To keep from crossing
      lease lines
     To stay within the
      specifications of a
      drilling contract
     To stay within the well
      spacing requirements
      of a developed field

10                     © 2001 PetroSkills LLC, All Rights Reserved
               Introduction

     Drilling multiple
     wells from a
     single structure
     or pad
     Most offshore
     development
     would not be
     possible without
     directional
     drilling

11               © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Inaccessible
                                       surface location
                                       Drilling in towns,
                                       from land to
                                       offshore and
                                       under
                                       production
                                       facilities


12    © 2001 PetroSkills LLC, All Rights Reserved
                 Introduction
     Drilling around
     salt domes
     Salt can cause
     significant drilling
     problems and
     directional drilling
     can be used to
     drill under the
     overhanging cap


13                  © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Steeply dipping
                                       sands can be
                                       drilled with a
                                       single wellbore




14    © 2001 PetroSkills LLC, All Rights Reserved
                    Introduction

     Fault drilling
     In hard rock,
     deviation can be a
     problem
     Sometimes the bit
     can track a fault
     Drilling at a higher
     incident angle
     minimizes the
     potential for
     deflection of the bit

15                    © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Relief well drilling
                                       Directional drilling
                                       into the blowout
                                       when the surface
                                       location is no
                                       longer accessible
                                       Very small target
                                       and takes
                                       specialized
                                       equipment
16    © 2001 PetroSkills LLC, All Rights Reserved
               Introduction

     Horizontal
     drilling
     Increasing
     exposure of the
     reservoir to
     increase
     productivity



17              © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Multilateral
                                       drilling
                                       Drilling more
                                       than one
                                       wellbore from a
                                       single parent
                                       wellbore



18    © 2001 PetroSkills LLC, All Rights Reserved
                Introduction

     Extended reach
     drilling wells are
     characterized by
     high inclinations
     and large
     departures in
     the horizontal
     plane


19                © 2001 PetroSkills LLC, All Rights Reserved
              Introduction

     Extended reach wells are
     wellbores where the horizontal
     departure is significantly higher
     than the true vertical depth of the
     well, which is the horizontal
     departure – TVD ratio (HD/TVD)
     Extended reach wells have been
     drilled with HD/TVD ratios
     greater the 6/1.

20              © 2001 PetroSkills LLC, All Rights Reserved
              Introduction

     BP drilled a well at Wytch Farm
     with a measured depth of 34,967’
     (10,658 m), a TVD of 5,266’ (1,605
     m) and horizontal departure of
     33,181’ (10,114 m)




21              © 2001 PetroSkills LLC, All Rights Reserved
              Introduction

     There are four basic hole
     patterns
     Not all wells conform to the
     basic hole patterns and may be a
     combination of patterns
     For simplicity, the basic hole
     patterns are defined as:


22             © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Type I is a build
                                       and hold
                                         Drilled to a relatively
                                          shallow KOP
                                         Deflected to a
                                          maximum inclination
                                         The inclination is
                                          held relatively
                                          constant to TD


23    © 2001 PetroSkills LLC, All Rights Reserved
                Introduction

     Type II is a build
     hold and drop
     often termed an
     “S” curve
     Multiple targets
     Around salt
      domes
     More torque and
      drag for the same
      departure
24                © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Type III is a
                                       continuous build
                                       to target
                                         Deeper kickoff
                                          point
                                         Small horizontal
                                          departure
                                         Less expensive



25    © 2001 PetroSkills LLC, All Rights Reserved
     Introduction

                                       Type IV is a
                                       horizontal
                                       wellbore
                                         Build rates may
                                          be high
                                         Hold inclination is
                                          near 90 degrees




26    © 2001 PetroSkills LLC, All Rights Reserved
“Designer”




                         True Vertical Depth (m)
Well                                               25
                                                   0
                                                     0


                                                   500
ERD Wells                                          750
                                                   1000
with                                               1250
significant                                        1500
                                                   1750
azimuth                                            2000
              Final
change(s)     Wellbore
                                                   2250




Highly
engineered
well plan
required
                                                                   Pilot Hole




                     © 2001 PetroSkills LLC, All Rights Reserved
     Introduction




28    © 2001 PetroSkills LLC, All Rights Reserved
     Introduction




29    © 2001 PetroSkills LLC, All Rights Reserved

				
DOCUMENT INFO
Shared By:
Stats:
views:15
posted:3/15/2012
language:
pages:29
Description: directional drilling