Cementing of pipes inside the well is one of the main operations performed during the drilling of an oil well. Cement has a basic function in the maintenance of wall and core pipes and well equipment.
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For drilling in oil and gas fields, not only the characteristics of drilling rigs and wall pipes differ depending on the type of field and formation, but also the cement used in drilling is of considerable importance.
Types and specifications of cement oil wells:
The cement used in oil wells is similar to construction cement, but with the addition of various chemicals and special operations, they can withstand harsh conditions inside oil wells. According to API regulations, 6 standard types of cement are made for oil wells.
Class E Cement: Used up to a depth of 14,000 feet when temperatures and pressures are too high.
The cement used in cementing oil wells is the same as industrial cement, except that in terms of structural composition, materials are added to increase the permeability of the cement slurry.
The type of material and the number of constituents of cement in the drilling industry should be such as to create the following properties in them: The viscosity of the cement and its hardening time should be such that it can be placed with a pump at a certain depth from the well.
As soon as it is in the well, it must be quickly and in the short term sufficiently resisted to prevent mechanical failure. In terms of chemical composition, earth fluids have no effect on it. It has such a consistency that it does not decompose and decay over time and does not lose its quality. The cement must be impermeable so that the floor fluid does not penetrate.
Cementing of pipes inside the well is one of the main operations performed during the drilling of an oil well. Cement has a basic function in the maintenance of wall and core pipes and well equipment. Cement also creates an impermeable barrier to the passage of gases and fluids in the formation, thus isolating the formations. In order to ensure success in all cementing activities of oil and gas wells, cement slurries are designed and tested based on good conditions. These tests are performed normally in a cement laboratory.
This cement is produced in two types of MSR, HSR (medium and high resistance to sulfate), and for use in wells with a depth of 10,000 to 14,000 feet whose pressure and temperature are high.