SU941549A1

SU941549A1 - Hole-bottom heater

Info

Publication number: SU941549A1
Application number: SU802921815A
Authority: SU
Inventors: Александр Михайлович Клеев; Евгений Соломонович Смеркович; Борис Яковлевич Маргулис; Рустам Рахимович Галимов
Original assignee: Татарский Государственный Научно-Исследовательский И Проектный Институт Нефтяной Промышленности
Priority date: 1980-05-07
Filing date: 1980-05-07
Publication date: 1982-07-07

Description

(54) ЗАБОЙНЫЙ НАГРЕВАТЕЛЬ(54) BOTTOM HEATER

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Изобретение относитс к области нефтедобычи в частности к устройствам дл термического воздействи на нефт ные пласты.The invention relates to the field of oil production, in particular, to devices for thermal effects on oil reservoirs.

Наиболее близким к предложенному по техническому решению вл етс забойный нагреватель, содержаш,ий камеру сгорани , св занные с устьем скважины трубопроводы дл подачи топлива, воздуха и контейнер дл окислител с клапаном.Closest to the proposed technical solution is a downhole heater, which contains a combustion chamber, pipelines connected to the wellhead for supplying fuel, air and an oxidizer container with a valve.

С поверхности земли до впускного отверсти генератора проход т два трубопровода дл подачи в камеру сгорани соответственно горючего и окислител . Около газогенератора на трубопроводе дл подачи топлива установлен первый клапан, а на трубопроводе дл подачи окислител - второй клапан. Управление первым и вторым клапанами осушествл етс блоком управлени , установленным на поверхности. При закрытом первом клапане нагнетают пусковое топливо в топливный трубопровод до уровн первого клапана. При закрытом втором клапане нагнетают окислитель в трубопровод дл окислител- до уровн второго клапана. Вслед за первым топливом в топливный трубопровод нагнетают второе топливо . Открывают первый и второй клапаныFrom the surface of the earth to the inlet of the generator, two conduits pass to feed the combustible and oxidant, respectively, into the combustion chamber. The first valve is installed near the gas generator on the fuel supply pipe, and the second valve is installed on the oxidizer supply pipe. The first and second valves are controlled by a control unit mounted on the surface. With the first valve closed, the starting fuel is injected into the fuel line to the level of the first valve. When the second valve is closed, the oxidizer is injected into the pipeline for the oxidant to the level of the second valve. Following the first fuel, the second fuel is injected into the fuel line. Open the first and second valves

ДЛЯ впуска первого топлива и окислител в камеру сгорани с целью воспламенени первого топлива. Подают в камеру сгорани второе топливо и окислитель, дл образовани горючей смеси, воспламен емой первым топливом 1.To inject the first fuel and oxidizer into the combustion chamber to ignite the first fuel. A second fuel and an oxidizer are supplied to the combustion chamber to form a combustible mixture ignited by the first fuel 1.

Недостатком данного нагревател вл етс сложность управлени запуско.м и использование индивидуальной системы тран спортировки жидкого окислител . Последнее осложн ет процесс спуско-подъемных опе10 раций, а также требует специального наземного оборудовани дл закачки этого компонента . Кроме того, в случае утечки окислител из трубопровода возможно возникновение взрывоопасной ситуации как на поверхности земли, так и во внутреннем прост15 ранстве эксплуатационной колонны.The disadvantage of this heater is the difficulty of controlling the start-up and the use of an individual transport system for the liquid oxidizer. The latter complicates the process of tripping, and also requires special ground equipment for the injection of this component. In addition, in the event of an oxidizer leaking from the pipeline, an explosive situation may occur both on the ground and in the internal space of the production casing.

Цель изобретени - упрощение системы управлени запуском нагревател и проведени спуско-подъемных операций, а также повышение безопасности работ.The purpose of the invention is to simplify the control system of starting the heater and carrying out tripping, as well as improving the safety of operations.

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Claims

This goal is achieved in that the oxidizer container is located in the well above the combustion chamber, the upper part of the oxidizer container being connected through a normally closed valve with a piston to an air supply pipe, and the displacement above the piston of the valve is connected to a fuel supply pipe. The drawing shows a diagram of the downhole heater. Downhole heater contains combustion chamber 1, nozzle 2, tubing string 3 (air supply pipe), fuel supply pipe 4. A container 5 filled with a liquid oxidizer is installed above the combustion chamber, the lower part of which is connected by the capillary 6 to the combustion chamber, upper the part through the normally closed valve 7 with the piston 8 and the orifice 9 with the air supply pipe, and the working volume above the piston 10 with the pipe 11 with the fuel supply pipe. Downhole heater works as follows. When air is injected (without fuel supply), the valve 7 is closed and the liquid oxidizer does not: flow out of the container due to the presence of capillary forces in the capillary 6. To start, the fuel is supplied at a cost that is higher than the workers. Due to the pressure drop across the nozzle, the pressure in the supply line, the fuel becomes higher than the pressure in the air discharge line, the piston starts to move down, and the valve opens. In doing so, the container cavity is connected to the interior of the air supply duct. Due to the gravitational forces and the difference in static pressures in the combustion chamber (high flow rates) and air injection lines (low speeds), the liquid oxidizer flows into the chamber, where it mixes with fuel, and the mixture ignites. After starting the chamber, the fuel consumption is reduced to the operating limits, the valve 7 closes and the outflow of the oxidant stops. If it is necessary to restart, the above operations are repeated. The invention makes it possible to significantly simplify the start-up technology of the heater, since there is no need to use start-up fuel, an oxidizer injection pump, and valve control systems on working lines. The oxidizer consumption is significantly reduced, and the lifting and lifting operations are simplified, since it is not necessary to lower the pipeline for the oxidizer and the electrical cables controlling the valves. In addition, even full leakage of the used volume of the oxidant does not lead to an explosion in the production string. DETAILED DESCRIPTION OF THE INVENTION A downhole heater comprising a combustion chamber, pipelines for supplying fuel, air, and an oxidizer container with a valve, connected to the wellhead, characterized in that, in order to simplify the launch control system and to carry out launch and lifting operations , the container for the oxidizer is placed in the well above the combustion chamber, the upper part of the container for the oxidant is connected through a normally closed valve with a piston to the air supply, and the working volume Above the valve piston is connected to a fuel supply pipe. Sources of information taken into account in the examination 1, US Patent No. 4053015, cl. 166-302, published. 1979 (prototype).

Fuel

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