# Question: What Is Well Trajectory?

## What is a deviated well?

Highly deviated wells may be described as those wells whose inclination exceeds 60° for most of their length.

It is possible to extend directional drilling techniques to increase the inclination to 60–90°, although alterations may have to be made to drilling practices..

## How is TVD measured from depth?

As the angle of deviation increases, the less True Vertical Depth is. TVD = . 940 x 1000 = 940 feet.

## What is sidetracking a well?

Sidetracking is the drilling of a new lateral from an existing well that has poor or no productivity due to mechanical damage to the well or depleted hydrocarbons at that particular site.

## How does a relief well work?

In the natural gas and petroleum industry, a relief well is drilled to intersect an oil or gas well that has experienced a blowout. Specialized liquid, such as heavy (dense) drilling mud followed by cement, can then be pumped down the relief well in order to stop the flow from the reservoir in the damaged well.

## What does azimuthal mean?

Azimuth is a horizontal angle measured clockwise in degrees from a reference direction, usually the north or south point of the horizon, to the point on the horizon intersected by the object’s line of altitude (a line from the observer’s zenith through the object to the horizon).

## What is dogleg severity?

Dogleg severity is a measure of the amount of change in the inclination, and/or azimuth of a borehole, usually expressed in degrees per 100 feet of course length. In the metric system, it is usually expressed in degrees per 30 meters or degrees per 10 meters of course length.

## What is dip angle in directional drilling?

In a directional well, the effective dip angle is the angle at which the bit strikes the bedding planes.

## How much money does a directional driller make?

Directional Driller SalariesJob TitleSalaryWeatherford Directional Driller salaries – 2 salaries reported\$37/hrNabors Industries Directional Driller salaries – 2 salaries reported\$102,855/yrScientific Drilling Directional Driller salaries – 2 salaries reported\$10,415/mo17 more rows

## What is the difference between inclination and azimuth?

The inclination angle measures the vertical direction and the azimuthal angle examines the horizontal direction. This measurement is relative to north, east, south and west. … This measurement is the difference between the actual and planned well paths.

## What is the difference between measured depth and true vertical depth?

True Vertical Depth (TVD) is measured vertically from the surface down to a certain target down hole. Measured Depth (MD) is the total length of the wellbore measured along the actual well path.

## What is minimum curvature?

The minimum curvature method is similar to the radius of curvature method in that it assumes that the wellbore is a curved path between the two survey points. … The minimum curvature calculations assume a curvature that is the shortest path for the wellbore to incorporate both surveys.

## What is vertical section?

: a mechanical drawing showing an interior, wall thicknesses, and similar relations as if made on a vertical plane passing through the object (as a building) depicted.

## What is azimuth in drilling?

n. [ Drilling] The compass direction of a directional survey or of the wellbore as planned or measured by a directional survey. The azimuth is usually specified in degrees with respect to the geographic or magnetic north pole. See: directional drilling, inclination, survey.

## What is a wildcat well?

Wildcat wells are an essential part of the exploration process, and can be defined as the first well to be drilled in a geographic region. … They are often referred to as exploratory or exploration wells.

## What is the difference between directional and horizontal drilling?

2. Directional Drilling is the process of drilling which controls the direction and deviation of the boring programmed to the targeted location. Horizontal Drilling is the process of drilling where the direction of the well is horizontal. …

## How much does directional boring cost?

3.1 Construction CostService/ProductPrice-LowUnitDirectional Boring – Rural\$6.00FootDirectional Boring – Urban\$8.00FootDirectional Boring – Rock\$42.50FootConduit (2” HDPE)\$0.75Foot14 more rows•Feb 1, 2017

## How do you find azimuth?

Therefore, an azimuth of 90° corresponds to a quarter of the way clockwise from 0° or 360°, which is east. Similarly, 180° is south, and 270° is west. You can get azimuths corresponding to NE, SE, SW and NW by adding or subtracting 45° to the appropriate N, E, S or W azimuth.

## What is horizontal displacement in drilling?

– Displacement: The horizontal distance between the vertical lines passing through the target and the wellhead. … – Kick-off point (KOP): The depth at which the well is first deviated from the vertical. – Measured depth (MD): Depth (length) of the well along the well path.

## How far can directional drilling go?

Directional DrillingRadius TypeRadius of Turn (m)Achievable Horizontal Distance (m)Ultrashort0.3–0.660Short1–12460Medium60–30046–1525Long300–850+600+–12,000+ (the latter is a record)1 more row

## What is measured depth in drilling?

In the oil industry measured depth (commonly referred to as MD, or just the depth), is the length of the borehole. In conventional vertical wells, this coincides with the true vertical depth, but in directional or horizontal wells, especially those using extended reach drilling, the two can deviate greatly.

## Why is horizontal drilling better?

Horizontal drilling is a commonly used technology because drilling at an angle other than vertically can stimulate reservoirs and obtain information that cannot be done by drilling vertically. Horizontal drilling can increase the contact between the reservoir and the wellbore.