Thermal injection pipe column and thermal injection valve of heavy oil thermal recovery well

Abstract

The invention provides a thermal injection valve of a heavy oil thermal recovery well. The thermal injection valve comprises an upper joint, a guide cylinder, a center pipe and a lower joint which are sequentially connected from top to bottom; the cylinder wall of the guide cylinder is provided with a plurality of flow dividing hole channels which are communicated from top to bottom; the axis of the flow dividing hole channels is parallel to the axis of the guide cylinder; a flow regulating ring, a springback body and a valve core are arranged in the flow dividing hole channels; the flow regulating ring is fixed at the lower end in the flow dividing hole channels; the valve core is located above the flow regulating ring; the outer circular conical surface which is arranged at the lower end of the valve core is matched with the inner circular conical surface which is arranged at the upper end of the flow regulating ring; the flow regulating ring is provided with a flow channel from the inner circular conical surface of the flow regulating ring to the lower end of the flow regulating ring; the springback body is located between the valve core and the flow regulating ring. The thermal injection valve of the heavy oil thermal recovery well has the advantages of enabling the flow of injected fluid to be automatically regulated and being uniform in gas injection, simple in structure, free of large moving parts, sensitive in flow control and convenient to replace.

Description

technical field [0001] The invention relates to a downhole tool for thermal recovery of heavy oil, in particular to a heat injection pipe string and a heat injection valve of a thermal recovery well for injecting high-temperature fluid in a thermal recovery well for heavy oil. Background technique [0002] my country's Bohai Oilfield is rich in heavy oil reserves, but Bohai heavy oil is mostly exploited by cold recovery, and its output is very limited. In recent years, with the continuous development of some thermal recovery technologies such as offshore multi-component thermal fluid, more and more offshore heavy oil fields are being exploited by thermal recovery. On the other hand, with the continuous development of horizontal well technology, horizontal wells are widely used in the field of heavy oil production due to their large oil drainage area and high degree of reservoir production. In the horizontal well, due to the relatively long horizontal section, the pressure c...

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Problems solved by technology

In addition, although some gas injection devices can be adjusted according to changes in formation pressure, the adjustment parts are large and insensitive, and cannot be easily replaced

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