How do you design a casing?

Casing program design is accomplished in three major steps:

1. Mud program is prepared.
2. The casing sizes and corresponding drill-bit sizes are determined.
3. The setting depths of individual casing strings are found.

What size well casing do I need?

The casing determines the size of the pump: 5″ and 6″ casing will accommodate a 4” submersible pump: 5 – 90 Gallons Per Minute (GPM) 8″ casing will accommodate a 6” submersible pump: 50 – 200 GPM. 10″ casing will accommodate an 8” submersible pump: 100 – 800 GPM.

What are the different types of casing?

The five types of casing string are conductor casing, surface casing, intermediate casing, casing liner, and production casing.

How is casing setting depth determined?

Two main factors determine the depth of the casing shoe, namely, the fracture pressure and the pore pressure. A third factor is the lithology, because it is desirable to place the casing shoe in a competent shale section. Methods to predict fracture gradients for deeper wells already exist.

What is casing design?

The design of a casing program involves the selection of setting depths, casing sizes and grades of steel that will allow for the safe drilling and completion of a well to the desired producing configuration. Such a casing string is called a combination string.

What is casing factor?

Each uniaxial design factor is defined as the minimum ratio required between the corresponding casing strength tabulated in API 5C2, on the basis of the formulae of API 5C3 (corrected to take into account the effects of corrosion, wear and fatigue) and the estimated design load. …

How deep should a borehole casing be?

In many cases, a seal is installed at the bottom of the casing to create a seal in the bedrock. On the surface, the casing will be about 12 inches above the ground. Throughout South Africa, water is often found at about 300 feet, but boreholes for household use usually range from about 100 feet to 500 feet deep.

How deep should well casing be?

Well Casing Depth Modern drilled wells reach greater depths, with a foot or two of casing above the well, a minimum of 18 feet of casing below the surface, if the well goes through bedrock, at least 5 feet of casing within bedrock.

What are the two basic types of casing?

There are six basic types of casing strings:

• Conductor Casing.
• Surface Casing.
• Intermediate Casing.
• Production Casing.
• Liner.
• Liner tieback casing.

What is casing depth?

Structural casing Typical depths range from 600 to 1,000 ft. Purposes for the pipe include solving additional lost-circulation or hole-caving problems and minimizing kick problems from shallow gas zones. Support the weight of all casing strings (except liners) run below the surface pipe.

How do you calculate casing pressure?

The shut-in casing pressure (SICP) is a measure of the difference between the formation pressure and the HSP in the annulus when a kick occurs. The pressures encountered in the annulus can be estimated using the following mathematical equation: FP = HSPmud + HSPinflux + SICP.

What is casing yield strength?

A system of identifying and categorizing the strength of casing materials. For example, the casing grade J-55 has minimum yield strength of 55,000 psi [379,211 KPa]. The casing grade P-110 designates a higher strength pipe with minimum yield strength of 110,000 psi [758,422 KPa].

What is a well casing?

Well Casing is a pipe with a large diameter that is assembled, inserted and cemented into a section of a recently drilled wellbore .

What is bore casing?

Bore casing is a casing pipe inserted into a drilled bore to prevent it from collapsing.

What is a casing pipe?

Casing pipe is a type of steel pipe that is typically used to enclose and surround a carrier pipe, which is installed through the center of this pipe. Steel casing pipe is most often used in underground construction projects to encase or protect utility lines from being damaged.

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