Screw drill - used to drill vertical holes, mainly used to drill various directional holes and special engineering holes (such as mine freezing holes). The large borehole reached 9023 meters. At present, the small diameter of screw drill in the world is 44.5mm and the large diameter is 304.8mm. When the screw drill is used for core drilling, a core tube shall be added between the drive shaft and the bit to take the core.Screw drill consists of bypass valve, screw motor (rotor and stator), universal joint, bearing and drive shaft. Its core is screw motor. In the screw motor rotor and stator transmission pair, the number of stator teeth Z1 is one more than the number of rotor teeth Z2: that is, Z1 = Z2 + 1. Their gear ratio is usually called transmission ratio, which can be arbitrarily selected in design. Small tooth ratio screw motor shall be used for designing high-speed screw drill, while large tooth ratio screw motor shall be used for designing low-speed and high torque scre...

Drilling and production accessories are used in the exploitation of oil. Drilling and production accessories contain more parts, such as felt. Felt is only one of them, but it has many uses, not only in the exploitation of oil. It is often used in other aspects. The felt in drilling and production accessories can be used on household appliances, such as TV. The function of the felt is to prevent the generation of electromagnetic waves, because it is an insulator. It can also isolate heat, which is equivalent to the function of heat dissipation. Felt can be used in the machinery industry, and its performance is relatively good. It can also be used to make dust and gas masks. The function of this mask is to filter out dust and block the gas outside. Even the car we often use in our life can also use it. When it is used on the car, it can isolate the heat of the car and reduce the noise. It is relatively heat-resistant. If it is used on the parts, the function is almost the same as the ma...

Packer is a downhole tool used for layering in oil production engineering. An oil production channel is designed on the packer. When setting, the piston sleeve goes up and the oil production channel is opened; After setting, the upper pressure acts on the balance piston and pushes the rubber cylinder upward to prevent the unsealing pin from shear force; During unsealing, the unsealing pin is cut off by the friction between the rubber cylinder and the casing, the piston sleeve goes down, and the oil production channel is closed. Advantages: it reduces the water plugging construction process of oil well packer, can easily realize the operation without killing and blowout, can bear high pressure in both directions and has long service life. The cup packer commonly used in oil field is self sealing. The outer diameter of the leather cup is larger than the inner diameter of the casing. The packer is sealed by the interference fit between the leather cup and the casing. When running down the...