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[[file:M91Figure161.JPG|thumb|400px|{{figure number|1|}}Horizontal wells are drilled at a high angle, generally greater than 80°, with the intent of keeping the well within a specific reservoir interval or hydrocarbon zone.<ref name=Shepherd_2009>Shepherd, Mike, 2009, [http://archives.datapages.com/data/specpubs/memoir91/CHAPTER28/CHAPTER28.HTM Types of wells], ''in'' M. Shepherd, Oil field production geology, [http://store.aapg.org/detail.aspx?id=788 AAPG Memoir 91], p. 231-297.</ref>]]
[[file:M91Figure161.JPG|thumb|400px|{{figure number|1|}}Horizontal wells are drilled at a high angle, generally greater than 80°, with the intent of keeping the well within a specific reservoir interval or hydrocarbon zone.<ref name=Shepherd_2009>Shepherd, Mike, 2009, [http://archives.datapages.com/data/specpubs/memoir91/CHAPTER28/CHAPTER28.HTM Types of wells], ''in'' M. Shepherd, Oil field production geology, [http://store.aapg.org/detail.aspx?id=788 AAPG Memoir 91], p. 231-297.</ref>]]
Horizontal wells are wells where the reservoir section is drilled at a high angle, typically with a trajectory to keep the well within a specific reservoir interval or hydrocarbon zone. In a strict sense, these wells are rarely perfectly horizontal, but they tend to be near horizontal mostly, generally at an angle greater than 80° from vertical.
[[Horizontal well]]s are wells where the reservoir section is drilled at a high angle, typically with a trajectory to keep the well within a specific reservoir interval or hydrocarbon zone. In a strict sense, these wells are rarely perfectly horizontal, but they tend to be near horizontal mostly, generally at an angle greater than 80° from vertical.
Horizontal wells are drilled in a specific configuration. The tangent section of the well is drilled along a deviated well path to just above the reservoir section, to what is known as the [[Kickoff point (KOP)|kick off point]]. From the kick off point, the well is drilled at an increasingly higher angle, arcing around toward an angle close to horizontal. The point at which the well enters (or lands on) the reservoir is called the entry point. From there on, the well continues at a near-horizontal orientation with the intention of keeping it substantially within the reservoir target until the desired length of horizontal penetration is reached ([[:file:M91Figure161.JPG|Figure 1]]).
Horizontal wells are drilled in a specific configuration. The tangent section of the well is drilled along a deviated well path to just above the reservoir section, to what is known as the [[Kickoff point (KOP)|kick off point]]. From the kick off point, the well is drilled at an increasingly higher angle, arcing around toward an angle close to horizontal. The point at which the well enters (or lands on) the reservoir is called the entry point. From there on, the well continues at a near-horizontal orientation with the intention of keeping it substantially within the reservoir target until the desired length of horizontal penetration is reached ([[:file:M91Figure161.JPG|Figure 1]]).