New method capable of improving super heavy oil edge-water reservoir development effect

Abstract

The invention provides a new method capable of improving the super heavy oil edge-water reservoir development effect. The new method includes the steps that reservoir flooding type diagnosis is conducted, and a proper reservoir is selected; an infill well is drilled on a well drain of a first-tier oil well nearest to edge water, and large-dose nitrogen foam water cone pressing is implemented on the first-tier old oil well and a new drill well; a remaining oil enrichment region is optimized in the reservoir for new well drilling, a steam driving well network is composed of a new well and the old well, and conversion to steam driving is achieved; normal steam huff and puff production is achieved on the two wings of the reservoir, edge water invading through diversion is used for shielding the body part of the reservoir for normal production; the new well is drilled in the water body, meanwhile, the old well is used, water is collected for reducing the pressure of the water body formationand the water supply amount of the edge water, and adverse influences of the edge water to the body part of the reservoir are relieved; and according to production needs, a new round of large-dose nitrogen foam water cone pressing is conducted on the first-tier well. By means of the method, the reserve volume and yield lost due to flooding are recovered, huge economic benefits can be brought, andgreat benefits are achieved for increasing the petroleum resource utilization rate and ensuring national energy security.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a new method for improving the development effect of super-heavy oil edge water reservoirs. Background technique [0002] Statistics show that in the world's conventional crude oil reserves, heavy oil, super heavy oil and asphalt reserves account for about 70%; in my country's proven oil reserves, heavy oil reserves account for more than 50%. Therefore, heavy oil will be an important position for future oil and gas development. my country's heavy oil reserves rank seventh in the world, and the resources are widely distributed. More than 70 heavy oil fields have been discovered in 12 basins. At present, the development and utilization rate of heavy oil in my country is only 8%, the main reason is that the technical process is not in place. How to innovate and form characteristic heavy oil recovery technology and effectively improve the country's heavy oil developmen...

AI Technical Summary

Problems solved by technology

[0003] Domestic and foreign petroleum exploitation fields have abundant water shutoff technologies for edge water heavy oil single wells, such as nitrogen foam, temperature-sensitive gel, jelly, polymer, steam flooding, etc. It is powerless to advance the edge water brought about by pressure mining. Usually, after the first-line oil wells are flooded rapidly, due to the high density and low viscosity of the water, the water front is easier to advance along the bottom of the oil layer, and gradually invades the second-line wells, and so on, causing A large number of oil wells are shut in due to high water cut, and a lot of reserves are wasted

The limitations of the traditional water plugging methods are: firstly, the cost is high, and it is difficult to meet the needs of large-scale applications; secondly, most of them are one-time or permanent water plugging, and it is difficult to carry out the second and third water plugging in this well; thirdly, The radius of water blocking effect is very limited, and it has no substantial effect on the large area between wells, and the edge water can open up new channels to continue flooding

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