Hollow water distributor

Abstract

The invention discloses a hollow water distributor, which is characterized in that a thread at the lower part of a water injection pipe is connected with a main thread at the upper part of a body, the body is internally provided with a water distributor core mounting hole, the middle part of the water distributor core mounting hole is provided with a reamed hole, a thread on a throttle pipe is connected with a secondary thread next to the main thread at the upper part of the body, the throttle pipe is internally provided with a throttle hole, a valve ball cavity is arranged below the secondary thread on the body, a passage is arranged below the valve ball cavity, the throttle hole inside the throttle pipe is communicated with the valve ball cavity which is communicated with the passage, the passage is communicated with the reamed hole, valve balls are arranged inside the valve ball cavity, and the axis of the main thread at the upper part of the body is not coaxial with that of the body. The axis of the water distributor core mounting hole is not parallel to that of the body. The upper part of the body is equipped with a water segregating cover which simultaneously covers the water injection pipe and the throttle pipe. As throttling is achieved by the throttle pipe, no piercing is caused and hierarchical quantitative water injection can be accurately maintained for a long term, thereby obtaining the deserved effect of waterflood development. The hollow water distributor adopts no movable component except for the opening and closing of valve balls, and has the advantages of simple structure, reliable working, long service life and prominent economical benefit.

Description

technical field [0001] The invention belongs to a tool for layered water injection in an oil field, and is a hollow water distributor. Background technique [0002] The main function of the hollow water distributor is to generate throttling, so that a certain pressure difference is generated inside and outside the water injection string, so that the differential pressure packer can be seated under this pressure difference to realize layered water injection. Another function of the hollow water distributor is to prevent formation water from flowing backwards. It can only inject water into the formation and prevent formation water from returning to the water injection pipe. The current hollow water distributor generates a thrust under the action of the pressure difference to compress the spring, and the axial displacement of the valve member opens to discharge. The pressure difference at the water outlet of this structure is suddenly generated, which is easy to puncture and da...

AI Technical Summary

Problems solved by technology

Another example is the Chinese patent application 03269335.4 "New Hollow Water Distributor", which also has the above-mentioned problems. In addition, its sealing sleeve 4 needs to slide to realize its function. Due to the serious fouling of the water injection well, sometimes it cannot slide

Therefore, hollow water distributors with sliding sleeves have more disadvantages

If the sealing surface of the orifice of the water distributor is damaged, it cannot play the role of throttling, and cannot seal the supporting differential pressure packer, and cannot achieve the purpose of layered water injection, nor can it prevent formation water from flowing backward

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