What is drift angle in directional drilling?

– Tangent angle of the well (or drift angle) is the inclination (in degrees from the vertical) of the long straight section of the well after the build-up section of the well.

What is wellbore trajectory?

Wellbore trajectory is controlled by the type of bottom hole assembly used and the weight on the bit. The bottom hole assembly, or BHA, is that portion of the drill string closest to the drill bit. It consists of several components: Subs, which are devices used to connect various parts of the BHA.

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.

What are the tools available for deviation in directional drilling?

The most common deviation tools for directional drilling are steerable motor assemblies (or so-called positive-displacement motors [PDMs]) and rotary steerable systems (RSSs). Other tools, such as turbines, are used mainly in Russia, and jetting bits are seldom used today.

What is a directional tool?

Drift angle and drift direction are measured by a survey tool conveyed in drill pipe or by wireline, and MD is determined by length of drill pipe or wireline. The various tools that are used fall into two categories: magnetic and nonmagnetic.

What are the various wellbore components?

A well’s primary components are the wellbore and casing. The wellbore is the hole that’s drilled into the earth to create the well. The casing consists of telescope-like layers of steel pipe placed inside the wellbore to reach what Zdarko calls the “pay zone.” That’s where the oil or gas is.

What is drilling torque?

Torque, is the rotational force between the drill string and the formation. Friction is caused due to the movement of the drill string. Other causes for torque and drag include hole cleaning, under-gauge holes, and wellbore stability. Side forces and Components. There are a few main factors that can cause side forces.

What is the cost of directional boring?

3.1 Construction Cost