SU1564327A1 - Method of making burning place in oil pool - Google Patents

Abstract

The invention relates to the oil industry and can be used in the development of oil deposits using in situ combustion. The goal is to increase work safety and simplify technology. Pyrophoric substance is burned in the bottomhole formation zone. Skeletal nickel is used as a pyrophoric substance. A mixture of skeletal nickel with solid fuel is prepared on the surface at a mass ratio from 1: 1 to 3: 1. Before air is injected, a mixture of skeletal nickel with solid fuel is pumped into the bottomhole zone as a suspension in water. Skeletal nickel slurry can be pumped using standard equipment. The use of skeletal nickel with solid fuels leads to an increase in the calorific value of the mixture. The selected ratio of components contributes to the ignition of the mixture and creates a steady burning center. Injecting air into the well allows you to maintain the movement of the source of combustion through the oil reservoir. 1 ill., 1 tab.

Description

The invention relates to the oil industry and can be used to create a source of combustion in the oil reservoir in the development of oil deposits using the in-situ combustion method.

The purpose of the invention is to improve the safety of work and simplify the technology of the process of creating in the oil reservoir a source of combustion.

According to this method of creating a source of combustion in the oil reservoir, which consists in burning a pyrophoric substance in the bottomhole formation zone by pumping it into the bottomhole control zone of the dlasts with subsequent injection of air, before the injection of air, an aqueous suspension of a mixture of skeletal nickel with solid fuel taken in weight ratio (1: 1) - (3: 1), and the suspension is pumped into the bottomhole formation zone.

When an aqueous suspension of a mixture of skeletal nickel with solid fuel is pumped into the bottomhole formation zone, and air is subsequently injected, skeletal nickel mixes with self-ignition and produces sufficient heat to ignite the solid fuel.

Skeletal nickel is a widely used catalyst in the chemical series.

Chests reactions. It is made by leaching, mainly light-alloys, and stored under water.

The advantage of using skeletal nickel is that it is not Pyrophoric when wet. Aqueous suspension of skeletal nickel can be pumped into the reservoir zone of the reservoir using standard equipment.

When using only skeletal nickel, the amount of heat produced during its ignition may turn out to be insufficient to create a source of combustion in the oil reservoir. A burning center cannot also be created using one solid fuel, since an external source of heat is needed to ignite it at the bottom of a well. Consequently, the use of a mixture of skeletal nickel with solid fuel is necessary to create a burning center in the oil reservoir. In addition, the use of skeletal nickel in cm s with solid fuel leads to an increase in the calorific value of the mixture.

Coal of various grades, 1 coke can be used as a solid fuel. In this case, it is most expedient to use petroleum coke as a fuel, because burning it at the well bottom does not result in clogging of the bottomhole zone, which is associated with its low ash content. Instead of petroleum coke, cheap non-condensed petrochemical waste can be used.

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The ratio of the components in the mixture is also significant. To create a hot spot in the oil reservoir, it is necessary to use a mixture of skeletal nickel with solid fuel, taken in a weight ratio (1: 1) - (3: i). The most optimal is the use of a mixture with a weight ratio of components equal to 1: 1. Such a ratio of components contributes to the curing of the mixture and the creation of a stable source of combustion. When using a mixture less than at 1: 1, the amount of skeletal nickel that is released during its ignition may not be sufficient to ignite solid fuels. And with an increase in skeletal ni55

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Its mixture calorific value is reduced in the mixture, and as a result, when using a mixture with more than 3: 1 content of skeletal nickel, the amount of heat released during the combustion of the mixture is insufficient to create a burning source in the oil reservoir.

The preparation of an aqueous suspension of a mixture of skeletal nickel with solid fuel allows the mixture to be pumped into the bottomhole formation zone.

Implementation of the injection of suspensions makes it possible to fill the bottomhole formation zone with a mixture of skeletal nickel with solid fuel. The injection of air into the well contributes to the self-ignition of skeletal nickel followed by the ignition of solid fuel in the mixture, leading to the creation in the oil reservoir of a fire. Further air injection supports the advancement of the source of combustion through the oil reservoir.

The possibility of this method is confirmed by laboratory experiments.

Experiments were carried out using a natural oil-saturated reservoir. Oil characteristics: density - 943 kg / m3, viscosity 1100 MPa-s (293 K). The breed is a mixture of sandstones, sands and siltstones with the main content (90 wt.%), Fraction 0.05-0.25 mm. Mineralogical composition, wt.%: Quartz - 30; feldspars - 25; rock fragments - 45.

Skeletal nickel was prepared by leaching a nickel-nickel alloy containing 50% nickel and 50% aluminum, and kept under water until the experiment.

Petroleum coke of КЗ-0 grade was used as a solid fuel.

The drawing shows temperature profiles over time along the formation model.

Example 1. For the experiment, a tube reactor 1.3 m long and 245 internal diameter, equipped with an axial thermocouple pocket 1.0 m long, was used for the experiment. The reactor of length 1.1 was filled with an oil reservoir. In a recess with a diameter of 50 mm and a length of 100 mm in the upper part of the oil reservoir was placed a wet mixture consisting of 100 g of skeletal nickel

and 100 g of petroleum coke. Next, air was fed to the reactor at a rate of 108 l / min.

Control of the combustion front on the reservoir model was carried out using five stationary thermocouples placed in a thermocouple pocket in the following sequence: 1-thermocouple is located at the lower end of the mixture of skeletal nickel with solid fuel, thermocouples 2-5 are located 150, 300, 450, 560 mm from the 1st thermocouple, respectively. Thermocouple 1 registers the temperature developed during the combustion of a mixture of skeletal nickel with solid fuel, the other thermocouples make it possible to follow the progress of the combustion front in the medium of the oil reservoir. The temperature values recorded using thermocouples are shown in the drawing as a function of time. The designations of the curves correspond to the location of thermocouples along the length of the model.

During the injection of air into the reactor, skeletal nickel was dried and ignited with the release of heat sufficient to ignite solid fuel. Temperature 30

The combustion front of a mixture of skeletal nickel and solid fuel, fixed by means of a thermocouple 1, was 1070 K. After burning the mixture of skeletal nickel with petroleum coke, 35 of the oil reservoir formed

stable front burning at a rate of 0.46 at 740 K.

Examples 2-6. as in example 1, with which mixtures were used to create the focus, as indicated.

The method provides the dangers of work when ripening in the oil reservoir and the injection of aqueous suspension of nickel from the rock is hard to be carried out with the standard field.

Claims (1)

Formula of izob A method of creating a nodal substance in a nidus of combustion, in a wellbore zone, by forming a material in the wellbore zone with air injection, which means that, using no safe technology, the material used is nickel on the surface of prepared nickel with solid mass ratio about before pumping the air injected zone see cm of nickel with solid fuel pensions in water. The effect of the composition of a mixture of skeletal nickel with solid fuel on the creation of the hearth of burning stable combustion front moving at a speed of 0.46 m / h on a temperature of 740 K. Examples 2-6. Carried out analogously to example 1, with the difference that the mixtures indicated in the table were used to create the hearth. EFFECT: increased safety of work during creation of the source of burning in the oil reservoir. The preparation and injection of an aqueous suspension of a mixture of skeletal nickel with solid fuels can be carried out using standard field equipment. The invention The method of creating in the oil reservoir of the source of combustion, which consists in burning a pyrophoric substance in the bottomhole zone of the formation by pumping it into the bottom hole zone with subsequent air injection, characterized in that, in order to improve work safety and simplify technology, the pyrophoric substance is used skeletal nickel, a mixture of skeletal nickel with solid fuel at a mass ratio of 1: 1 to 3: 1 is prepared on the surface, and before injecting air into the bottomhole zone, a mixture of skeletal Ikel with the solid fuel in the form of sus 100 go coke) 100 (technical coal) 4ff Compiled by I. Lopakova Editor M.Tovtin Tehred l. Serdyukov Proofreader T. Pal and and Order 1146 Circulation 481 VNII1SH of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and publishing complex Patent, Uzhgorod, unitary enterprise. Gagarin, 101 ISO 20ff „UH. Subscription