Hollow adjustable polymer blending device

Abstract

The invention discloses a hollow adjustable polymer blending device. The hollow adjustable polymer blending device comprises a center pipe, an adjusting core, anti-prick pistons and a sealing piston. The adjusting core is inserted into the lower end of the center pipe and connected into an inner cavity of the center pipe. The adjusting core communicates with the inner cavity of the center pipe. The outer side of the center pipe is sequentially sleeved with the anti-prick pistons and the sealing piston from top to bottom. An upper piston cavity is defined by the anti-prick pistons. The bottom end of the center pipe and the outer side of the adjusting core are sleeved with a throttling sleeve. A lower through hole is formed in the portion, located on the upper half segment position of the sealing piston, of the center pipe and is plugged by the sealing piston for the time being. By the adoption of the hollow adjustable polymer blending device, the length or the gap of the matching faces of a polymer blending device working cylinder and a polymer blending core can be adjusted, and a polymer injection channel can be effectively prevented from being blocked; and meanwhile, an annular groove in the outer surface of the polymer blending core is designed to be of a conical structure, and the gap between the conical face and the working cylinder is adjusted by moving the core in the vertical direction, so that polymer flows around threaded grooves to achieve pressure difference control.

Description

technical field [0001] The invention relates to an oilfield polymer injection well device, in particular to a hollow adjustable polymerizer. Background technique [0002] During the application of the hollow single-tube layered polymer injection technology, it was found that in order to adapt the polymer solution to the reservoir types of different blocks, the concentration of the mother liquor prepared by each polymer injection station was different, resulting in unstable polymer viscosity and stratification. During the test, the value range of the wellhead pressure point is small, and it takes too long to stabilize the pressure. There is a certain error in the data acquisition, which generally takes 2-3 days; Put a polymerizing core of the corresponding length into the working cylinder of the polymerizer of the layer, and perform the stratification test calibration again. Later, when the injection volume or injection viscosity of the layer is adjusted, the deployment needs...

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Problems solved by technology

[0002] During the application of the hollow single-tube layered polymer injection technology, it was found that in order to adapt the polymer solution to the reservoir types of different blocks, the concentration of the mother liquor prepared by each polymer injection station was different, resulting in unstable polymer viscosity and stratification. During the test, the value range of the wellhead pressure point is small, and it takes too long to stabilize the pressure. There is a certain error in the data acquisition, which generally takes 2-3 days; Put a polymerizing core of the corresponding length into the working cylinder of the polymerizer of the layer, and perform the stratification test calibration again. Later, when the injection volume or injection viscosity of the layer is adjusted, the deployment needs to be re-tested. For multi-stage injection wells, the test When deploying, it is necessary to repeatedly send and salvage the polymer cores at all levels, and the on-site workload is heavy, which affects the normal production of the oil field; at the same time, affected by the water quality of the injected polymer, the annular throttling channel of the downhole polymer is prone to fouling and blockage. In the later deployment, the fishing force is too large and it is easy to get stuck, which affects the life of the string

At present, foreign polymer injection wells mainly adopt general injection, a single well corresponds to a single layer, and layered injection is realized in the well pattern. There is no relevant research on single-well layered polymer injection technology. Long, because the well conditions are good, the difference in physical properties between layers is small, and the injection rate of each layer is relatively small. The field mainly uses eccentric single-pipe layered polymer injection, and repeated fishing tests are required. There are also obstacles in fishing and the risk of encountering a card

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