The oil pipe is a pipe that is lowered into the casing of the oil well during normal production. In a self-flowing well, the oil flows into the ground through the oil pipe and enters the gathering and transportation process. In a machine-drilled well, the oil pipe, sucker rod, and deep well pump (i.e., "three-pumping" equipment) are combined to pump the oil to the ground and enter the gathering and transportation process.
The casing is a pipe that is lowered into the well after drilling. The casing and the well wall are sealed with cement, and then the perforating gun is used to perforate the target layer, so that the oil flows through the rock layer, cement ring, and casing to the bottom of the well, and then enters the oil pipe to the ground.
The main functions are: first, to reinforce the well wall to prevent formation collapse; second, to isolate different oil layers and water layers to achieve stratified mining; third, to facilitate the implementation of fracturing, acidizing and other measures and maintenance operations. Fourth, to form an oil flow channel and cooperate with the oil pipe to achieve the purpose of oil production.
The operation sequence is: after the oil well is drilled, the casing is lowered, the casing and the well wall are sealed with cement, and the oil pipe is lowered into the casing. The oil pipe is equipped with oil seals, pumps and other downhole tools. A sucker rod is inserted into the oil pipe, and the sucker rod pulls the pump piston to do up and down reciprocating motion. In this way, the oil is pumped to the surface.
