A combined oilfield water injection well layered acidification device

Abstract

The invention belongs to the technical field of oil field acidizing equipment, and in particular relates to a combined layered acidizing device for oilfield water injection wells, which includes several acidizing units detachably connected; the acidizing unit includes an outer pipe and an inner pipe, and the inner pipe is coaxially sleeved inside the outer pipe The acidizing liquid injection pipe is arranged in the cavity left between the outer pipe and the inner pipe; the nozzle, whose liquid inlet end is connected with the acidizing liquid injection pipe, and the liquid outlet end is inlaid on the outer pipe wall; the ring connection The lower end of the inner tube is exposed to the outside of the cavity, and the connecting plate is in sealing connection with the bottom of the cavity; the telescopic positioning component and the joint component are installed on the outer periphery of the lower end of the inner tube and are located under the connecting plate. The present invention sets several detachably connected acidizing units for positioning at different formation heights in sand control pipes in oil field water injection wells. They can be connected or used in discrete distribution, and have a blocking effect on sand control pipes of different formation heights, with strong pertinence and high efficiency. High, can also save acidizing fluid.

Description

technical field [0001] The invention belongs to the technical field of oilfield acidification equipment, and in particular relates to a combined layered acidification device for oilfield water injection wells. Background technique [0002] Oil field water injection or oil production mainly depends on the sand control pipe installed in the water injection well, and the oil penetrates into the sand control pipe and is then mined. During the long-term production process, the sand control pipe will be blocked, and acidification and plugging removal are required to restore and improve the permeability of the formation, so as to reduce the resistance of oil flowing into the well or the resistance of water injection, so as to increase the production of the oil well. Purpose of well injection. [0003] In the prior art, sand control pipe plant lumen flushing and rotary water jet unblocking processes are often used, and the acidizing solution penetrates into the formation through fl...

AI Technical Summary

Problems solved by technology

However, this technology does not distinguish the clogging of sand control pipes at different formation heights, so the whole pipe unblocking operation is often used

However, in actual production, the clogging conditions of different sections of the sand control pipe are different, some positions may not be clogged, and some positions may be severely clogged, and the required acidification and plugging removal time is also different. However, it lacks pertinence, which may lead to waste of acidizing fluid at positions that do not need to be unblocked, and insufficient time for unblocking at positions that need to be unblocked

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