Wellbore

Wellbore

A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources, including oil, gas, or water. A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources, including oil, gas, or water. Borehole is often used as a synonym for wellbores, though sometimes the borehole refers to the open diameter of the hole itself, whereas the wellbore is the hole including the casing between the opening and the rock or earth walls on the outside. The motivation for drilling a wellbore is usually to extract oil or gas for a protracted period of time. The drilled hole may refer to the inside diameter of the wellbore wall or the rock face that bounds the drilled hole.

A wellbore is a type of borehole that is used to extract oil or gas.

What Is a Wellbore?

A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources, including oil, gas, or water. A wellbore is the actual hole that forms the well. A wellbore can be encased by materials such as steel and cement, or it may be uncased. The motivation for drilling a wellbore is usually to extract oil or gas for a protracted period of time.

A wellbore is a type of borehole that is used to extract oil or gas.
A borehole can also be used for mineral extraction, environmental assessment, and temperature measurement.
Wellbores are typically vertical shafts that might be uncased or encased with cement and steel.
The purpose of the wellbore is to extract oil and gas for a protracted period of time.

Understanding a Wellbore

A wellbore is a type of borehole, which is a narrow shaft that is drilled into the ground_ — either horizontally or vertically — _to extract water, petroleum, or gases. Other reasons for drilling boreholes include mineral exploration, environmental site assessment, and temperature measurement.

Resource extraction companies dig wellbores to gain access to the natural resources they are seeking, such as oil and gas. A wellbore is usually a straight vertical shaft that "bores" into the ground to allow the recovery of natural resources. It also includes the open hole and uncased portions of the well.

Examples of a Wellbore

The following is a diagram of an oil wellbore encased in steel and cement. The wellbore is the actual drilled hole. The drilled hole may refer to the inside diameter of the wellbore wall or the rock face that bounds the drilled hole. The wellbore can then be cased with materials to improve its stability while improving operation and resource recovery.

Borehole is often used as a synonym for wellbores, though sometimes the borehole refers to the open diameter of the hole itself, whereas the wellbore is the hole including the casing between the opening and the rock or earth walls on the outside.

Wellbore encased in steel and cement

Wellbores must be cleaned before and after production because if mud or debris is not removed, it can increase operating costs while increasing safety and environmental risks. Furthermore, drilling wellbores is complex and requires specialized training, tools, and equipment. When successful, the wellbore creates a well that can extract oil and gas for a protracted period of time.

Though wellbores are commonly thought to belong to oil drillers, a wellbore can be used for any type of well. For thousands of years, drillers have used drilling rigs or a hand-operated rigs to dig wells. The machinery and techniques used to create wellbores differ based on geological conditions and the intended purpose of the well. For offshore drilling, floating units or platforms supported by the seafloor are used for the drilling rig.

Chinese miners have been creating wellbores since at least the Qin Dynasty (221–206 BC). Initially, these wells could reach depths of 30 meters. By the 1800s, depths of 1,000 meters were being achieved.

K.S. Tom describes the drilling process: "The Chinese method of deep drilling was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the boring tool was rotated by buffalo and oxen." Early oil extraction in California in the 1860s and beyond used this method, which they called "kicking her down."

Related terms:

Directional Drilling

Directional drilling is a technique used by oil-extraction companies in order to access oil in underground reserves. read more

Exploration & Production (E&P)

An exploration & production company is known to be in a specific sector within the oil and gas industry. read more

Fracking Defined

Fracking is a slang term for hydraulic fracturing. Fracturing shallow, hard rock wells to extract oil dates back to the 1860s. read more

Spud

Spud is the process of beginning to drill a well in the oil and gas industry. The initial drilling is lined with casing and cement to protect the nearby groundwater from contamination. read more

Steam-Assisted Gravity Drainage (SAGD)

Steam-assisted gravity drainage (SAGD) is a drilling technique used to extract heavy oil that cannot be mined using traditional methods. read more

Vertical Well

A vertical well is a technique for accessing an underground reserve of oil or natural gas that involves drilling vertically into the ground. read more