Casing, also known as casing string, is an important component of drilling tools. It plays a variety of roles and applications in petroleum engineering. The classification, functions and applications of casing will be introduced in detail below.
According to their different functions and uses, casing can be divided into several types such as cementing casing, liner, fine casing, oil casing and casing wheel. They will be introduced one by one below. The first is cementing casing, which is the most common type of casing used in drilling. Cementing casing is mainly used to fix the well wall, protect the formation, and control well leakage.
During the drilling process, when drilling into the wellbore, casing must be run in time for cementing. Cementing casing can prevent well wall collapse, delamination breakthrough, etc., and ensure drilling safety.
A liner, as the name suggests, is a type of casing used to line a wellbore and protect the formation. Lining is a casing process performed inside casing, also called "casing casing." After drilling the wellbore, if there are problems in the formation, such as formation collapse, abnormal production pressure, etc., lining operations will be required. Liners can improve the success rate of drilling and effectively protect the formation.
Fine casing is a type of casing following cementing casing and liner. Fine casing is typically used in porous reservoirs and hazardous wellbore conditions. The diameter of the thin section of fine casing is smaller than that of the thin section of ordinary casing, which can reduce drilling fluid pollution in open holes. The use of fine casing under harmful merging conditions can effectively protect the completion wellbore and equipment in the wellbore.
Oil casing is a special type of casing used to protect oil and gas wells. There are strict requirements on the materials and specifications of oil casing. High-strength, corrosion-resistant special pipes are generally used. Oil casing plays a key role in oil and gas wells, which can protect oil and gas layers, prevent well leakage and well wall collapse.
The casing roller is a device used to lift and lower casing. The main function of the casing roller is to suspend, transport and place the casing. It is an important tool connecting the drilling string and casing, and undertakes the important tasks of transporting the casing from the surface to the bottom of the well and fixing the casing in the well.
As for the application of casing, there are mainly the following aspects:
The first is applications in the field of petroleum engineering. Casing plays an important role in petroleum engineering, such as protecting well walls, controlling well leakage, and increasing well wall stability. It is a key tool to ensure drilling safety and smooth oil and gas development.
Second is the application in geothermal energy development. Geothermal energy is a renewable and clean energy, and casing plays a role in fixing the geothermal well wall and protecting the formation in the development of geothermal energy.
In addition, casing is also commonly used in coal mining, geological and mineral investigation, engineering geology and other fields. In coal mining, casing can be used to stabilize tunnel walls and ensure mine safety; in geological and mine surveys, casing can be used to sample and record underground core samples; in engineering geology, casing can be used to Fixed strata, soil layers, etc.
In addition, casing is also commonly used in coal mining, geological and mineral investigation, engineering geology and other fields. In coal mining, casing can be used to stabilize tunnel walls and ensure mine safety; in geological and mine surveys, casing can be used to sample and record underground core samples; in engineering geology, casing can be used to Fixed strata, soil layers, etc.
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