SU66383A1 - Pressure increase method in depleted oil reservoir - Google Patents

Description

When reducing or stopping the flow of oil from the reservoir into the well, oil is displaced by injection: WATER, air, natural gas, or cooled combustion products.

The flooding method is associated with useless extraction, together with oil, of water, the amount of which exceeds the amount of oil produced by ten times. Air injection degrades the quality of the oil and leads to the formation of a dangerous explosive mixture. Gas for injection in the conditions of exhausted; there are deposits in small quantities.

Common drawbacks (the use of these working agents is easy; the possibility of breaking through a working agent by means of the least resistance when the working agent passes from the injection well to the production one, has not done useful work to displace oil. Even where the cold working agent passed All oil is separated out of the thorns.

The use of steam, although it contributes to the complete separation of the oil, has the disadvantage that steam condenses under conditions

reservoir, loses its volume, necessary for pushing out oil.

The volume-thermal effect of igniting part of the oil in the reservoir, due to the natural imperfection of the reservoir as a firebox, “did not lead to practical results, and it came down to injecting the gas-air mixture at high temperature, but with negligible heat content. If the injection of cold air causes some harm in the sense of oil oxidation, the injection of a hot gas-air mixture, in the opinion of many experts, is under-harmful, since it leads to the formation of bituminous substances that encapsulate the pores of the formation. So, for example, at the beginning of the injection of a burning gas / air mixture in the rock extracted from the injection well, there were 8–10% of natural oil; after pumping, the rock had 5.4% lol-solid bituminous substances; this means that 50 to 60% of the reservoir oil has turned into bitumens, which are almost impossible to extract to the surface.

The pressure boosting method proposed by the present invention.

in a depleted oil reservoir, it is different in that a steam-ohm mixture is pumped into the plCI through the injection well | This mixture is obtained by burning a mixture of fuel with air under pressure and evaporating the water in the combustion products.

The air, compressed by compressors, is supplied to where, for complete combustion at an excess air coefficient,. As a result of a unit close to the unit, the mountains are fed; (ga3, mozut, etc.). In the image, OMITCH, 1WC combustion products for D / W or the temperature and the formation of a mixture of gases, water is introduced in an amount depending on the desired temperature of the comb. The conditional approximate amount of products: 46.5% air, 3.5% fuel and 50% water.

The vapor-gas mixture of combustion products with saturated or superheated balls of water or other liquid is chemically neutral to the reservoir oil and is a good heat carrier (more than 800 cal. Per 1 m of injected air). Calculations made with regard to heat losses showed that if 1000 m of combined-cycle CMiCCK per day iB was pumped into the drained reservoir with a capacity of 10 m, with a flux content of 200 kg / m, then the temperature of the reservoir increased by 150 ° C over a radius of 20 MI from the injection well. PIR (this only from the heated part completely separates oil in quantities of more than 2500 tons and condenses only about 1000 tons of water. In the event of a breakthrough, gas oil is lost at less resistance), separating oil from the oil and heating it along with water, increasing resistance the movement of the breakthrough, by which the pressure is leveled and rises in all directions from the injection well, i.e. the process of displacement will be followed by the virgin oil.

For a 100 per cent recovery of 1 ton of oil from the reservoir, it is theoretically necessary to inject no more than 400 meters of air into the furnace. At the same time, 33 "g of fuel is consumed and KOHI is condensed in the reservoir about 0.4 tons of water, partially extracted from the reservoir, ameste with 1oil. By reducing the coefficient of recoil this is (The amount can be increased to 2 meters of air, 0.17 kg of fuel and 2 kg of water per tonne of displaced oil.

The thermal-thermofluid effect of vapor-gas injection can also be used for other purposes, for example, for dewaxing lifting pipes without stopping compressor, flowing and deep-pumping wells, for cleaning the bottom hole zone from paraffin and cmol oil-borne substances blocking the oil flow path into the well, and etc.

Subject and title

Claims (2)

1. A method of increasing pressure in an exhausted oil reservoir, characterized in that a vapor-gas mixture is pumped into the formation through an injection ocean. 2. An implementation of a method according to claim 1, characterized in that the gas-vapor mixture is obtained by burning a mixture of fuel with air from a pressure and evaporating water in the combustion products.