sagd steam injection system

Abstract

The invention discloses an SAGD (steam assisted gravity drainage) steam injection system comprising a steam injection station provided with an inlet and an outlet and at least one steam distributor. The steam injection station comprises at least one boiler. Any steam distributor is communicated with the outlet of the steam injection station. Each steam distributor is provided with a plurality of steam injection lines. The SAGD steam injection system further comprises a plurality of steam trap valves close to a wellhead. The steam trap valves are in one-to-one corresponding communication with the steam injection lines. Each steam trap valve is provided with a drain outlet and a steam outlet; the drain outlet of every steam trap valve is communicated with the inlet of the steam injection station; the steam outlet of every steam trap valve is communicated with an oil well. The SAGD steam injection system with the structure has the advantages that dryness of high temperature steam entering the oil well can be increased, separated saturated water can be reused, and heat of the saturated water is reused.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, in particular to a SAGD steam injection system. Background technique [0002] SAGD (full name Steam Assisted Gravity Drainage, also known as Steam Assisted Gravity Drainage) injects high-temperature steam into the reservoir from a vertical well or a horizontal well above the horizontal production well near the bottom of the reservoir to condense the heated crude oil and steam Fluids are produced from horizontal wells at the bottom of the reservoir. [0003] In the process of production and distribution, the high-temperature steam generated by SAGD will also be saturated with water. However, the steam injected by SAGD should minimize its saturated water content, that is, increase the steam dryness. Because the saturated water will move down into the well under the action of gravity, and then be lifted to the surface. In this process, there may be a temperature difference between the satura...

AI Technical Summary

Problems solved by technology

[0004] In order to solve this technical problem, steam with 95% dryness can be produced by using steam-water separator and equal dryness distribution in the prior art. The content is still relatively large, the remaining dryness at the bottom of the well is generally only 60%-70%, and the steam utilization rate is low

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