Polymer injection device free from dropping and fishing

Abstract

The invention relates to a polymer injection device free from dropping and fishing. The polymer injection device comprises a polymer injection device body (1) and a throttling core (2). A core rod (25) is arranged below a fishing rod (22) and can be driven by the fishing rod (22) to rotate with the fishing rod (22). A connecting sleeve (26) is arranged below an upper main body (21), wherein the upper end of the connecting sleeve (26) is connected with the upper main body (21). A nut (27) sleeved on the core rod (25) is installed in a fusiform rod (24). Fusiform holes matched with the outer wall of the fusiform rod (24) of the throttling core are formed in the part inner wall between a liquid inlet (31) and a liquid outlet (32) of a throttling core hole (3) of a main body (11) of the polymer injection device body (1). When the polymer injection device is used, the throttling core does not need to be pulled out of the ground so as to be changed, flow and pressure drop can be directly adjusted by a tool in the down hole, and therefore the polymer injection operation free from dropping and fishing working can be achieved through polymer injection work, manpower, material resources and time can be greatly saved, precision and reliability of polymer injection are improved, oil extraction cost is reduced indirectly, and oil extraction efficiency is improved.

Description

technical field [0001] The invention relates to petroleum tools, in particular to a polymerizer for multi-layer injection of polymers in oilfield water wells. Background technique [0002] With the development of tertiary oil recovery in my country's oilfields, eccentric multi-layer injection polymer technology is being applied more and more widely, and has received good oil accumulation effect. However, the existing eccentric polymer injection tools generally have the following problems: 1. The adjustment of the flow rate and pressure drop during polymer injection is realized by replacing the shuttle-shaped throttling cores of different specifications and models. It is salvaged from the ground, put in a new throttle core, and is replaced and adjusted repeatedly until the pressure drop and flow rate are suitable. The process is complicated and cumbersome; The injection parameters of the choke cores that have been adjusted in other layers will be affected, and the parameters...

AI Technical Summary

Problems solved by technology

However, the existing eccentric polymer injection tools generally have the following problems: 1. The adjustment of the flow rate and pressure drop during polymer injection is realized by replacing the shuttle-shaped throttling cores of different specifications and models. It is salvaged from the ground, put in a new throttle core, and is replaced and adjusted repeatedly until the pressure drop and flow rate are suitable. The process is complicated and cumbersome; The injection parameters of the choke cores that have been adjusted in other layers will be affected, and the parameters need to be re-adjusted for the layers whose parameters have changed. It is necessary to repeatedly fish and replace the choke cores. close to the design value

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