Underground sleeve rotational flow guider

Abstract

The invention discloses an underground sleeve rotational flow guider, which solves the problem that during the down sleeve operation, the sleeve cannot be lowered to the estimate position as the drilling fluid is poor in rock debris carrying capability. Guiding stators are arranged in an outer cylinder of the guider; inclined guiding round holes are arranged in the guiding stators; blade grids are fixed with the lower parts of the guiding stators through mandrels; and impellers are fixed with the tail ends of the mandrels. According to the invention, fluid axially flows in and impacts the blade grids to rotate after the running direction is changed by the inclined holes of the guiding stators, so as to provide power for the impellers at the lower parts of the mandrels and drive the impeller to rotate; the guider can be automatically driven underground, pushes away rock debris deposited at the well bottom, and enables the rock debris to go upwards easily, thereby improving the capability of carrying rock debris of drilling fluid, can grind and smash the rock debris at the well bottom, enables the rock debris to be impacted and carried away by water easily, and avoids the pipe-sticking danger as large particles are difficult to carry.

Description

technical field [0001] The invention relates to the technology of sand washing and well washing in casing casing operation in petroleum engineering and the technology of swirling flow cementing in hydraulics. Background technique [0002] In the process of casing running in petroleum engineering, the function of floating shoes is mainly to guide the casing string into the well smoothly along the wellbore, prevent the bottom of the casing from inserting into the well wall rock formation, reduce the resistance of going down the well, and also have a certain ability to carry cuttings. ability. However, due to the instability of the wellbore wall in some wells, the wellbore wall collapsed or the diameter was reduced, and the ability of the drilling fluid to carry cuttings was not enough, resulting in sand bridges or sand settlement at the bottom of the well. The ability of the floating shoe itself to wash and carry cuttings is not enough, so the casing cannot be lowered to the ...

AI Technical Summary

Problems solved by technology

However, due to the instability of the wellbore wall in some wells, the wellbore wall collapsed or the diameter was reduced, and the ability of the drilling fluid to carry cuttings was not enough, resulting in sand bridges or sand settlement at the bottom of the well. The ability of the floating shoe itself to wash and carry cuttings is not enough, so the casing cannot be lowered to the expected position

In response to this problem, Liaohe Petroleum Exploration Bureau Engineering Technology Research Institute designed a drilling cuttings bed agitator, the patent number of which is 01271736.3. The advantages of this device are simple structure and easy use. The cuttings in the drilling fluid are smoothly discharged to the ground; but there are still the following disadvantages: (1) The power to remove the cuttings bed is mainly to use the stirring and carrying effect of the helical blade, the force is not very large, and the removal efficiency of cuttings is not high

(2) The distance between the helical blade and the well wall affects the cuttings-carrying capacity, making the already narrow annular space smaller, reducing the space for cuttings to move upwards, and the cuttings-carrying capacity is not high

(4) It is powerless to clean the wellbore in the collapsed or easy-to-collapse well section

What's more, the Drilling Technology Research Institute of Shengli Petroleum Administration Bureau of Sinopec Group has studied a drill bit nipple that generates hydraulic pressurization pulses at the bottom of the well. Its patent number is 03269456.3; the advantage of this device is that it can form periodic The pressurized pulsation and negative pressure pulsation, so as to reduce the "holding effect" of cuttings, strengthen the purification effect at the bottom of the well, improve the efficiency of jet rock breaking and auxiliary rock breaking drilling; but it has the following disadvantages: (1) structure Complicated, a lot of energy is lost in the process of generating the pulse, which reduces the impact of the water jet

(2) It must rely on pressurization and negative pressure pulsation alternately to reduce the "holding effect". At the same time, it is intermittent and cannot work continuously or directly act on the surface of cuttings, and the purification efficiency is not high.

[0003] Therefore, it is very difficult to deal with this problem with conventional technology. In severe cases, the casing must be pulled out, and the well must be run through the well, which wastes a lot of manpower and material resources and causes huge economic losses.

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