Mud pump working principle and performance classification

Mud pump principle Mud pump is in the drilling process, the drilling mud or water to send the irrigation fluid machinery. Mud pumps are an important part of drilling machinery. Its main function is to inject mud into the borehole along with the drill bit during the drilling process. It plays the role of cooling the drill bit, cleaning the drill tool, fixing the borehole wall, driving the drilling, and bringing the cuttings back to the ground. In commonly used positive circulation drilling, mud pump is the surface flushing medium ─ ─ water ﹑ mud or polymer flushing fluid under certain pressure through the center of the high-pressure hose ﹑ taps and drill pipe straight to the bottom of the drill bit to reach Cool the drill bit, remove cuttings and deliver them to the surface. Commonly used mud pump is piston or plunger, driven by the power machine crankshaft rotation of the crankshaft through the crosshead and then drive the piston or plunger to reciprocate in the pump cylinder. In the suction and discharge valve under the action of alternating pressure to achieve the purpose of circulating fluid and washing. Mud Pump Performance The two main parameters of mud pump performance are displacement and pressure. Displacement in a few liters per minute discharge calculation, which is related to the diameter of the borehole and the required rate of flushing fluid from the bottom of the hole on the speed, that is, the larger the aperture, the greater the displacement required. Requires the rinse fluid on the back speed of the bit can cut the drill cuttings ﹑ rock punching timely from the bottom of the hole, and reliably carry to the surface. Geological core drilling, the general return speed of 0.4 to 1 m / min or so. The pressure of the pump depends on the depth of the borehole, the resistance of the passage through which the flushing fluid passes, and the nature of the flushing fluid delivered. The deeper the borehole, the greater the resistance of the pipe and the higher the pressure required. With the drilling diameter, depth changes, requiring the pump displacement can be adjusted at any time. In the pump mechanism with gearbox or hydraulic motor to adjust its speed, in order to achieve the purpose of changing the displacement. In order to accurately grasp the pump pressure and displacement changes, the mud pump to be installed on the flow meter and pressure gauge, at any time to make the drilling staff to understand the operation of the pump at the same time by pressure changes to determine the status of the hole is normal to prevent intra-hole accidents. Mud pump classification Mud pump single-action and double-acting two types, single-acting mud pump piston reciprocating motion in only one cycle of suction and drainage action. The double-acting mud pump reciprocates once to complete the suction and drainage movements twice. If according to the classification of mud pump cylinder, there are three types of single cylinder, double cylinder and three cylinders. Sewage pump is a single-stage single-suction vertical centrifugal pump, the main components of the volute, impeller, pump base, pump housing, support tube, motor base, motor and other components. Volute, pump base, motor base, impeller nut is cast iron, corrosion resistance is better, the processing technology is convenient. Impeller is a single string of three curved leaves, the choice of semi-enclosed impeller, and the use of malleable iron, so high strength, corrosion resistance; processing convenience, good sex, high efficiency. In order to reduce weight and reduce the amount of turning, the shaft is made of high-quality carbon steel cold-drawn Park Steel. Mud pump seat is equipped with four skeleton oil seals and bushings to prevent shaft wear and prolong the service life of the shaft. The mud pump can be vertical or inclined to use, covers an area of ​​small, volute buried in the working medium to work, easy to start, without diversion, the direction of rotation should be seen from the rear of the motor clockwise work. Switchboard length with a variety of specifications, so that the use of units according to their own use according to local conditions.