A large-displacement single-pipe layered polymer injection adjustable device

Abstract

The invention discloses a large-displacement single-pipe layered polymer injection adjustable device. The large-displacement single-pipe layered polymer injection adjustable device comprises a measurement and adjustment tool guide-in mechanism, an injection amount adjustment mechanism and a polymer depressurization and viscosity-keeping mechanism. The measurement and adjustment tool guide-in mechanism has a guide function and a positioning function. The injection amount adjustment mechanism has the functions of spirally lifting and dropping an injection allocation core and adjusting the injection amount of the polymer depressurization and viscosity-keeping mechanism. The polymer depressurization and viscosity-keeping mechanism is provided with a spindle injection allocation runner with the depressurization and viscosity-keeping characteristics. The injection allocation core has an enough inner drift diameter to guarantee the conduction of work like profile test. Meanwhile, a bridge type passage is arranged in a layered polymer injection measurement and adjustment work barrel, and polymer injection of other layers is not affected when the current layer is tested. The large-displacement single-pipe layered polymer injection adjustable device has the characteristics of large injection amount, good viscosity-keeping performance and adjustable injection amount, realizes single-pipe layered polymer injection measurement and adjustment multi-layer injection, resolves the existing difficulties of layered polymer injection of offshore oil fields, and can effectively improve the utilization rate of polymers and the oil displacement effect.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oilfield polymer flooding and production stimulation technology, in particular to an adjustable device for single-pipe layered polymer injection with large displacement. Background technique [0002] In recent years, with the popularization and application of polymer flooding stimulation technology in offshore oilfields, the number of polymer injection wells in offshore oilfields has gradually increased. However, due to the serious heterogeneity of formations, the contradiction between layers is prominent, and the desired polymer flooding effect cannot be achieved, resulting in The polymer injection efficiency is low, and the polymer flooding effect is not obvious. [0003] Although the general polymer injection method can achieve the displacement effect to a certain extent, the displacement effect in offshore oilfields is still unsatisfactory due to the conflict between layers. Theref...

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Problems solved by technology

[0007] In summary, none of the existing technologies can meet the maximum polymer injection rate of 500m in a single layer in offshore oilfields. 3 / d or above, the number of sub-injection layers is above 6 segments to subdivide the requirements for poly-injection

In addition, sand control completion methods are adopted in offshore oilfields, and the layered polymer injection tools developed for onshore oilfields cannot be applied to offshore oilfields

With the development of polymer injection work and the current form of low global oil prices, the layered polymer injection tools developed in offshore oilfields cannot meet the requirements of cost reduction and efficiency increase. In order to better exert the effect of polymer flooding, it is urgent to develop Single-pipe layered polymer injection technology based on the combination of reservoir characteristics and completion characteristics of offshore oilfield polymer injection wells

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