Thermal production well filling vapor and nitrogen foam profile control technique

Abstract

The invention relates to a thermal developing well pouring steam nitrogen foam adjusting method comprising steam, nitrogen and foaming agent pouring method and nitrogen generating pouring method, wherein the steam is poured via an oil tube, the nitrogen and the foaming agent are poured in via a muffle, while the mass ratio between the foaming agent, steam is 1:250-500, the mass ratio between the nitrogen and the stem is 50-80:1, the pouring speed is steam at 10-13t / h, foaming agent at 0.1-0.5t / h, and nitrogen at 900-1000Nm3 / h. And the invention uses four-section plug pouring process, while the first section plug pours nitrogen via the muffle for 12h at 900-1000Nm3 / h, the second section plug pours the steam via the oil tube for 24h at 10-13t / h, and the third section plug pours steam via the oil tube and pours nitrogen and foaming agent via the muffle at 10-13t / h, 900-1000Nm3 / h, and 0.1-0.5t / h for 2h, the fourth section plug stops pouring foaming agent and holds the pouring speed of the nitrogen and the steam for 12h, repeats the steps of four section plugs until preset demand, closes the well, then opens well to produce.

Description

1. Technical field [0001] The invention relates to a nitrogen foam profile control process suitable for steam injection in steam huff and puff thermal recovery wells in heavy oil oilfields, and is suitable for profile control applications in high water-cut wells in heavy oil steam huff and puff recovery oilfields, specifically a thermal recovery The invention relates to a profile control process method of injecting steam and nitrogen foam into a well, belonging to the field of petroleum development. 2. Background technology [0002] More than one-third of my country's crude oil reserves belong to heavy oil reservoirs. Due to the physical properties of heavy oil (high underground viscosity, poor fluidity, high colloid and asphaltene content), thermal recovery is the main technology for the development of heavy oil reservoirs . Gudao Oilfield has also implemented thermal recovery development based on steam huff and puff for heavy oil reservoirs since 1992. Since 1996, the annu...

AI Technical Summary

Problems solved by technology

However, the heterogeneity of heavy oil reservoirs and the characteristics of thermal recovery technology, the deposition of colloid and asphaltene after multiple rounds of huff and puff, and the gravity overriding cause steam channeling in high-permeability layers, water channeling, steam channeling, and steam channeling along the high The breakthrough of the permeable zone makes the steam sweep coefficient small and greatly reduces the effective steam sweep area; after multiple rounds of huff and puff, the pressure drop of the formation increases, which is affected by the invasion of edge water and bottom water, which reduces the benefit and effect of heavy oil thermal recovery

[0003] The throughput cycle of Gudao Oilfield reached 430 days, but due to the increase of throughput rounds, the cycle oil-gas ratio decreased, resulting in a sharp increase in oil well water cut

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