A downhole oil-water separation pipe string

Abstract

The invention discloses a downhole oil and water separation pipe column which comprises an over-cable packer, a refilling water measuring and adjusting working cylinder, an X-type converter, a water and oil separator, a canned pump system, a positioning sealing unit and a perforated pipe which are connected in series from the top the bottom through an oil pipe. Three channels are formed, liquid produced by a liquid producing layer enters an oil and water separator channel, an after-separation low-oil production water measuring and adjusting refilling channel, and a high-oil production liquid lifting channel. In a downhole tube cylinder with a limited size, the refilling water measurement and adjustment are achieved by using a pipe column upper part center channel, the pipe column form is simple, the operation is simple, the pipe column is reliable, the problem that annulus backfilling water after separation is difficult to monitor and control is solved, the high-emission oil and waterseparation downhole parameter control is achieved, and the stability of a downhole oil and water separation system is ensured.

Description

technical field [0001] The invention relates to an auxiliary tool for oil-water separation in the oil production process of an oil field, in particular to a downhole oil-water separation and monitoring control pipe string. Background technique [0002] Downhole oil-water separation technology has considerable application prospects, and its success depends not only on the structure of the oil-water separator itself, but also on the application of downhole measurement and adjustment technology. Monitoring and regulating the downhole parameters, adjusting the split ratio (split ratio = reinjection water flow rate / total formation liquid production rate), so that the separator operates in the best state, can improve the separation efficiency and reduce the oil content of the reinjection water. To achieve the above functions, on the one hand, it is necessary to use the special string structure to establish channels for liquid production, oil-rich lifting after separation, and low-...

AI Technical Summary

Problems solved by technology

The other one is aimed at the production fluid with a maximum of 3000m 3 / d's large-displacement downhole oil-water separation annular space measurement and adjustment system (application number 201510317024.4), adopts the method of annular space flow collection measurement and adjustment. The cup or packer collects the reinjection water, its outer diameter is large, it is not easy to run in, and it is easy to cause the risk of failure. The annulus measurement and adjustment work cylinder also has a large outer diameter and a deep run, and it is difficult to protect and pass through the signal cable The problem

Abroad, some applications have been made in the monitoring of downhole pressure and temperature parameters, but no related technologies have been retrieved for the precise monitoring and control of large-displacement downhole flow. The electric submersible pump frequency converter and the surface oil nozzle adjust the separation efficiency of the hydrocyclone, but due to the fixed size of the reinjection water port, it is impossible to accurately adjust the water injection volume

Images