Concentric pipe double jet flow negative pressure sand pumping device and method

Abstract

The invention relates to a concentric pipe double jet flow negative pressure sand pumping device and method. The upper ends of outer oil pipes and inner oil pipes are connected with the lower ends of concentric dual oil pipes; power liquid enters annular spaces between the concentric dual oil pipes through a ground device, and the power liquid enters a double jet flow sand pumping device in a well along the annular spaces between the outer oil pipes and the inner oil pipes; one part of the power liquid sprays downwards, and the sand in a pitshaft is washed to be loose; the other part of the power liquid sprays upwards, the sand in the pitshaft is inhaled into a pump core through the negative pressure, and after the other part of the power liquid is mixed with one part of the power liquid, mixed liquid is formed and flows upwards to a grit chamber on the ground through the inner oil pipes and the concentric dual oil pipes. The concentric pipe double jet flow negative pressure sand pumping device and method has the advantages that the sand below the well can be pumped to the ground thoroughly; the sectional area of a pump cylinder in an outer flow channel is increased two times or above two times, so that the upward resistance of the liquid below the sand well is reduced; the areas of inner oil pipes from bottom to top are identical, the sand of the flowed mixed liquid is upward and downward in a same speed, and the situation that a sand bridge cannot work in the prior art is avoided.

Description

technical field [0001] The invention relates to an underground sand pumping device in the petroleum industry, in particular to a negative pressure sand pumping device and a method for concentric tube double-jet flow negative pressure sand pumping. Background technique [0002] In the process of crude oil extraction, because most oil layers are prone to sand production, if sand production occurs in horizontal wells (or lost wells), after a period of production, sand will bury production intervals, affecting normal production and affecting the effective use of production capacity and The smooth implementation of follow-up measures requires timely sand washing and well washing operations to ensure the smooth flow of the wellbore. [0003] Existing technology is at present: the one, the sand-washing process of conventional pen point fueling pipe, this process is not applicable to the serious well of leakage in horizontal well or vertical well. The 2nd, in view of the above prob...

AI Technical Summary

Problems solved by technology

The existing problems are: there is no mention of how to realize the operation of the concentric double-tube sand washing string, how to carry out the construction operation, and there is no detailed description and explanation

But its existing problems are: first, the double oil pipes it adopts are below a certain depth in the well, and are provided with sealing cups, and the upper part adopts tool oil pipes. After entering the injector, the returned sand-carrying liquid enters the tool oil pipe with a larger diameter through the inner pipe of the double oil pipe. The diameter difference between the two is large. The formation of sand bridges makes the device unable to continue to work; second, the high-pressure power fluid enters the ground through the annular space between the casing and the tool tubing. In this way, the casing needs to withstand high pressure, which is not allowed in the oil production standard to withstand pressure exceeding 12 MPa, and the power fluid for sand washing needs to be much higher than this pressure, so it is easy to cause the oil well to be scrapped or even a major production accident

The third is that there will be a problem with the structure of the lower nozzle. It is difficult to control the amount of water sprayed down. There will be two situations. In order to seal the system, the whole system is in a state of suppressed pressure, so that the liquid and sand in the well are pressed into the formation, and the purpose of sand flushing cannot be achieved; B means that when the water spray volume is less than the suction volume, the liquid and sand in the formation are pumped in large quantities If it is sucked to the ground, it will easily cause a large amount of sand to be produced in the formation, which will not be washed cleanly, and the power fluid on the ground will increase. If there is a large amount of crude oil in the pumped liquid, it will also cause the problem of well site pollution.

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