What are the types of well completion?

What are the types of well completion?

Open hole completions, liner completions, and perforated casing completions are the three types of completions. Conventional single-perforated casing completions are employed in the majority of wells. However, under some situations, numerous, alternate, or narrow hole completions may be employed. These include dual-perforated casing completions, concentric-hole completions with multiple screens within each hole, and horizontal completions with several screens placed along the length of a horizontal section of pipe.

Single-perforated casing completions are used when there is no need for circulation during production. If circulation is required during production, then dual-perforated or other multi-perforated completions should be used instead. The number of perforations required depends on the type of well construction and the type of formation being drilled. In general, between 12 and 20 holes are needed to provide sufficient flow area for most formations. Multi-perforated casings are usually made in lengths of about 40 feet and require only one set of perforations every 20 feet along the tubing string. This reduces the amount of metal needed for drilling and completing the well.

Concentric-hole completions with multiple screens within each hole are used in horizontal wells where it is necessary to divide up the hydrocarbon bearing zone into sections so that different treatments can be applied to each section.

What is the process of completion?

The process of completing a well so that it is ready to produce oil or natural gas is generally referred to as well completion. When drilling is finished, the process of assembling downhole equipment to allow production from a well is known as completion. Completion involves any work necessary to make a well capable of producing oil or natural gas. This may include installation of casings, lines, valves, and other tools.

Completing a well also includes testing and treating the reservoir to maximize hydrocarbon recovery. These steps are required whether or not the well will eventually be able to produce at a level acceptable for economic reasons. They include: installing safety devices (such as blowout preventers), checking overpressure conditions, clearing any restrictions in the tubing string, and preparing the surface facilities if necessary.

Finally, completion may involve some non-productive activities such as removing reservoirs oils and gases from around the well site. This is called remediation and can improve recovery rates from existing wells. It can also protect groundwater sources from contamination caused by oil and gas activity.

Well completion is an important part of any oil or natural gas operation. In addition to ensuring safety, this process should provide the maximum amount of recovery possible. Too often, operators fail to complete their wells properly, which can result in lost profits.

What is meant by "practical completion"?

There is no universally accepted concept of "practical completeness." In general, it is the moment at which a building project is finished, with the exception of small flaws that may be corrected without significant interference or disruption to an occupant. In the case of large projects such as skyscrapers, practical completeness is usually taken to be the day on which all remaining work is completed. The owner can then occupy his or her new home.

In the construction industry, practical completion is a key factor in determining when a contract will be completed and payments received. If a project is not practical-completed on time, the contractor may be required to refund any payment made thus far or provide additional performance bonds. The contractor and subcontractors are also entitled to charge their customers for services performed before practical completion.

Many factors may cause delay in completing a project, including but not limited to: the presence of hazardous materials on the site; changes needed in codes or regulations; issues relating to the quality of the soil; problems with the plumbing, heating, or electrical systems; and damage caused by weather events (such as floods or earthquakes). Delay also occurs when one party to a contract refuses to go forward. For example, if a contractor stops working because he has not been paid, this would be considered a delay.

How is "substantial completion" defined?

Substantial completion is the point at which a construction project is regarded sufficiently finished for the owner to utilise it for its intended purpose. The phrase of the American Institute of Architects form contract AIA A-201: General Conditions is used to define significant completion. This states that substantial completion means that the work or service is complete as far as possible or practicable considering all the circumstances.

In other words, substantial completion means that the project is completed to a sufficient degree so that it can be used by the owner without further significant work or modification. Substantial completion also indicates that the owner cannot find any serious defects in the project that would affect its use.

Some examples of projects that have reached this stage are full hospitals with all their departments functioning normally, schools with all their classes held during the day, and courthouses able to hold court proceedings.

Other examples might be museums with all galleries open, theaters with all seats in place and operating, and commercial buildings with all their rooms prepared for occupation.

When does a project not reach this stage? If a project doesn't reach this stage, then it isn't complete. In other words, some parts of the project may be finished but others need to be done before it can be considered complete.

For example, if a building's roof needs repairing, it won't reach substantial completion until the problem has been fixed.

What is well completion equipment?

Aside from the production packer, downhole completion equipment may include pressure and temperature gages to monitor the well during production, production screens to prevent sand or particles from entering the production tubing, and chemical injection and gas lift valves to improve production and...

Completion equipment is installed in a cell of a horizontal well to facilitate removal of hydrocarbons once they have been extracted. Completion equipment includes: a production packer that seals off one section of the cell from another when it's set, and opens up to allow oil or gas to flow into the cell; sensors to detect problems with the well or its output (e.g., low pressure), which may require maintenance work to be performed; and other components such as safety devices that protect against damage or injury caused by excessive pressure or temperature.

Horizontal wells are drilled with a drill bit that spins at a high rate as it bores its way through the rock layer below the drilling platform. Because water tends to pool in areas where there is not an exit path, horizontal wells often need some type of stimulation treatment to encourage oil or gas to flow into the well for recovery. Hydraulic fracturing or "fracking" is the most common stimulation technique used in horizontal wells. The treatment involves pumping a mixture of water, chemicals, and sand deep into the well bore to fracture shale layers and create more surface area for oil to reach.

About Article Author

Wallace Dixon

Wallace Dixon is an avid collector and user of vintage technology. He has been known to take apart old radios just to see what makes them work, and he's even been known to fix them himself when they don't!

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