Method for improving economic benefit of single well by exploiting oil and gas through bottom water vapor flooding

Abstract

The invention discloses a method for improving the economic benefit of a single well by exploiting oil and gas through bottom water vapor flooding, namely heating the upper part of formation water of an oil and gas reservoir in a pressure control and stabilization mode, preheating the oil and gas reservoir, continuously boiling the formation water, and exploiting the oil and gas through the bottom water vapor flooding of the oil and gas reservoir; and the accumulated oil production of the single well of an oil reservoir is improved by increasing the single-well controlled reserves of a production well and reducing the number of heating horizontal wells, bottom water invasion is inhibited and delayed by replacing a single-branch horizontal production well with a multi-branch production well, increasing the preheating temperature of the oil reservoir and regulating and controlling one or more combination modes of the liquid discharge amount and the electric heating power of the production well, the horizontal radial flowing speed of crude oil is increased, the oil reservoir recovery efficiency and the oil extraction speed after the single-well controlled reserves are increased are further increased, the electric charge cost and the energy consumption of per ton of oil are reduced, and then the single-well economic benefits are increased. A digital-analog calculation result shows that the average cumulative oil production of a single well of a 80m * 200m * 600m multi-branch horizontal production well model is 180000-270000 tons, and the economic benefit is 3-5 times that of a 80m * 80m * 200m small well spacing model.

Description

technical field [0001] The method belongs to the petroleum and natural gas industry. By heating the upper part of the bottom water layer of the oil and gas reservoir to preheat the oil and gas reservoir to generate bottom water vapor, the oil production mechanism of increasing the temperature and reducing the viscosity of crude oil and bottom water steam flooding, bottom water hot water flooding, and elastic pressure of the reservoir are utilized. Comprehensive oil and gas recovery such as flooding and other comprehensive oil and gas driving methods for oil and gas recovery. The oil and gas reservoirs are all kinds of natural oil / gas reservoirs with edge and bottom water, and they can also be the edge / top / bottom water oil and gas reservoirs formed by artificially injecting water into the oil and gas reservoirs from the ground. The method of heating formation water in oil and gas reservoirs is not limited to electric heating, and any form of energy can be converted into heat en...

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Problems solved by technology

However, the existing problem is that the well spacing calculated by the model is small, and the cumulative oil production of a single well ranges from 20,000 to 57,000 tons due to different algorithms for electric heating horizontal wells. In oil and gas regions, the economic benefits of a single well still cannot meet the requirements

However, in traditional thermal recovery methods such as steam injection, the well pattern density of 200m×300m cannot achieve the ideal thermal recovery development effect. Many objective factors such as heat injection, crude oil production, and bottom water intrusion restrict the oil recovery effect of the reservoir. Problems such as difficult production of reserves, low recovery rate of oil reservoirs, and poor economic benefits are more prominent and more obvious than thermal recovery with small well spacing on land

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