Automatic inflow control device and pipe column

Abstract

The invention relates to an automatic inflow control device and a pipe column. The automatic inflow control device comprises an upper shell, a lower shell and a disc. A fluid inlet is formed in the upper shell. A cavity is formed between the upper shell and the lower shell, a fluid channel is formed between the fluid inlet and the cavity, and the disc is suitable for flowing in the cavity. Fluid outlets are formed in the side face of the cavity. The pipe column comprises sealing separation media and the automatic inflow control devices. The multiple automatic inflow control devices which are connected through a porous base pipe are arranged in the pipe column, and the corresponding sealing separation media are arranged between every two adjacent automatic inflow control devices. The automatic inflow control device and the pipe column have the advantages of blockage resistance, high pressure difference resistance and scale formation resistance, and are particularly suitable for exploitation of an oilfield which is characterized in that the nonhomogeneity is high, bottom water coning operation is fast, and the water content is high.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to an automatic inflow control device and a pipe string. Background technique [0002] Bottom water coning and premature water flooding of production wells are one of the most common problems in oil production. Conventional passive inflow control tools currently used have limited effect on delaying water flooding. The main problems are: inability to distinguish the nature of the inflow fluid (crude oil, water, crude oil with water), and general restrictions on oil or water, resulting in certain oil production In particular, it also plays a role in controlling the crude oil with a very low water content; after the bottom water is put in, the excess flow of the device cannot be automatically adjusted according to the water content. At present, there are some automatic inflow control tools with intelligent selection and suppression functions for fluids. The more mature o...

AI Technical Summary

Problems solved by technology

Conventional passive inflow control tools currently used have limited effect on delaying water flooding. The main problems are: inability to distinguish the nature of the inflow fluid (crude oil, water, crude oil with water), and general restrictions on oil or water, resulting in certain oil production In particular, it also plays a role in controlling the crude oil with a very low water content; the excess flow of the device cannot be automatically adjusted according to the water content after the bottom water is put in

At present, there are some automatic inflow control tools with intelligent selection and suppression functions for fluids. The more mature ones include floating disc type and flow channel control type, etc., but the complexity of the flow channel will cause sand particles to form sand accumulation in the flow channel. And the disadvantage of gradually clogging the flow channel

[0003] In the actual oilfield production process, the water cut rises too fast and water control is required, and the following other problems often occur, which lead to production interruption, affect production efficiency, increase workover costs, and may even lead to early scrapping of production wells: Some wells need sand control, and some wells have high fine silt content, so there is a risk of blockage of the valve body channel and risk of tool erosion by sandy fluid; in order to meet the production demand, there is a need to increase the pressure difference to increase production; due to the difference in oil properties , easy to scale and wax in the wellbore

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