Objectives

In this module you will learn to do the following 1. Define directional drilling by choosing the correct answer from a list of selections. 2. Recall the historical development of directional drilling by choosing the correct answer from a list of selections. 3. Recognize the reasons for drilling the following types of wells exploration, appraisal, development production. 4. Identify descriptions and pictures of directional drilling applications. 5. Identify several features of a directional well...

Introduction

Directional drilling has become a very important tool in the development of oil and gas deposits. Current expenditures for hydrocarbon production have dictated the necessity of controlled directional drilling to a much larger extent than previously. Probably the most important aspect of controlled directional drilling is that it enables producers all over the world to develop subsurface deposits that could never be reached economically in any other manner. In this module a number of topics will...

Description of Directional Drilling

Bottom Hole Location

Drilling a directional well basically involves drilling a hole from one point in space the surface location to another point in space the target in such a way that the hole can then be used for its intended purpose. A typical directional well starts off with a vertical hole, then kicks off so that the bottom hole location may end up hundreds or thousands of feet or meters away from its starting point. With the use of directional drilling, several wells can be drilled into a reservoir from a...

Which of the following is the most important aspect of controlled directional drilling

A It enables producers all over the world to develop subsurface deposits that could never be reached economically in any other manner. b It is the science of deviating a wellbore along a planned course to a surface target location that is a given lateral distance and direction from the horizontal. c It enables producers all over the world to develop subsurface deposits that could have been lost due to improper drilling equipment. d It enables producers all over the world to kill wild wells.

Offshore Multiwell Drilling

Onshore Drilling

Offshore multiwell drilling is the most economical way to develop offshore fields. Several directional wells are drilled in clusters on a multiwell offshore platform. 2 Which of the following directional drilling applications is the most economical way to develop an oil field that is below a large body of water but within drilling reach of land b Offshore drilling to onshore locations c Onshore drilling to offshore locations d Multiple exploration wells from a single offshore wellbore

Match each well profile feature with its definition

A The actual measured vertical depth from a reference point on the surface to a point of interest b The lateral distance from the surface location to the target c Direction of a course measured in a clockwise direction from 0-360o referred to North d The length of the projection of the horizontal displacement onto the vertical section plane defined by its azimuth.

Well Profile Directional

Directional Well

11 Write in the correct term to correctly complete the following sentence. A well profile is the planned well trajectory from the surface_to the final drilling 12 Which of the following must be known to determine the best geometric well profile from the surface to the bottomhole target Select all the correct answers. b The position of the surface location c The position of the target location 13 Identify the features of the directional well profile. 14 Match each well profile feature with its...

No Study Questions Part

1 Which of the following is the correct definition for directional drilling a The science and art of deviating a wellbore along a planned course to a surface target location that is a given lateral distance and direction from the horizontal b The science and art of deviating a wellbore along a planned course to a subsurface target location that has not been Determined c The science and art of deviating a wellbore along a planned course to a subsurface target location that is a given vertical...

Definition of A Well Plan

Well planning is an organized process used to put together data that will be used to design a successful well. A well plan is a very important stage prior to the commencement of the drilling operation to ensure that all aspects are tailored to meet the specific objectives of that well. Anadrill well plans are often developed in a Drilling Engineering Center DEC by a well planner. Understanding how to design a well plan proposal , is one of the most important duties of the directional driller....

Which of the following is the correct definition for directional drilling

A The science and art of deviating a wellbore along a planned course to a surface target location that is a given lateral distance and direction from the horizontal b The science and art of deviating a wellbore along a planned course to a subsurface target location that has not been Determined c The science and art of deviating a wellbore along a planned course to a subsurface target location that is a given vertical distance and direction from the horizontal d The science and art of deviating...

Three General Types of Wells

Directional Wells

Wells are generally classified as exploration wells, appraisal wells, and development wells production wells. Exploration wells, sometimes called wildcat wells, probe the earth where no known hydrocarbons exist to determine whether oil or gas are present in a subsurface rock formation. Appraisal wells are drilled to determine the extent of a field or the amount of area it covers. Development or Production wells are drilled in an existing field to remove the obtainable hydrocarbons.

Summary

Directional drilling has become a very important drilling process. It has enabled producers all over the world to develop subsurface deposits that could never have been reached economically in any other manner. In this module, directional drilling was defined along with its historical development. The applications of a directional well as well as the features of a well profile were also covered. The module also included information on the types of well profiles and the components of a well...

Historical Development of Directional Drilling

In 1930, the first controlled directional well was drilled in Huntington Beach, California, USA. The well was drilled from an onshore location into offshore oil sands. Controlled directional drilling had received rather unfavorable publicity until it was used in 1934 to kill a wild well near Conroe, Texas, USA. As a result, directional drilling became established as one way to overcome wild wells, and it subsequently gained favorable recognition from both companies and contractors.

Extended Reach Wells

Multilateral Well

Extended reach wells are drilled to reach reservoirs that have a horizontal displacement in excess of 16,400 ft gt 5,000 m from the starting point. Multilateral wells have several wellbores running laterally and originating from one original hole. Multilateral wells have several wellbores running laterally and originating from one original hole.

Horizontal Wells

Horizontal wells are used to intersect a producing formation horizontally to better produce the reservoir. Horizontal drilling increases the surface area of a producing formation. For example, a vertical well may give exposure to a reserve with a depth of 20 to 30 ft 6 to 10 m while a horizontal well drilled into the same reservoir may give exposure to 2000 to 3000 ft 600 to 1000 m . Horizontal wells can make a platform profitable, where it was not previously.

Identify the features of a directional well profile

Reference Point Reference Direction

The buildup rate is the change of inclination of a wellbore where the angle is increased. The rate is usually expressed in degrees per 100 ft or angular increase per 30 m of the measured depth. The turn rate determines the rate a well profile turns in azimuth direction. Usually expressed in degrees per 100 ft or degrees per 30 m. The true vertical depth of any point or station along a wellbore is the vertical distance from the well surface reference point to the station of interest. The...

Features of A Directional Well Profile

Trayectory Distance Displacement

A directional well profile is the planned well trajectory from the surface to the final drilling depth by projecting the wellbore onto two plotted planes. In order to determine the best geometric well profile from the surface to the bottomhole target, the following information must be known the position of the surface location, the position of the target location, and The kickoff point is the location at a given depth below the surface where the wellbore is deviated in a given direction. The...

Directional Well Profiles

In this lesson you will learn to do the following A directional well profile is the planned well trajectory from the surface to the final drilling depth by projecting the wellbore onto two plotted planes. In order to determine the best geometric well profile from the surface to the bottomhole target, the following information must be known the position of the surface location, the position of the target location, and the true vertical depth TVD . A directional well profile is the planned well...

Salt Dome Drilling

Horizontal Directional Drill

Salt domes have been found to be natural traps of hydrocarbons accumulating beneath the overhanging hard cap. A directional well is used to reach the trapped reservoir to prevent the problems associated with drilling a well through the salt formation. Identify descriptions and pictures of directional drilling applications.

Short Medium and Long Radius Wells

Directional Drilling Salt Dome

Short radius wells, typically re-entries of old vertical wells, have curves with a 143 ft 44 m radius or smaller that cannot be drilled with conventional motors. They are used to isolate higher- lower-pressured production zones or water sands without setting and cementing a liner. This type of drilling is desirable when kicking off below a problem formation. Medium radius wells have curves with a 200-500 ft 61-152 m radius that can be drilled with conventional motors. Long radius wells have...