A coiled tubing downhole multi-element thermal fluid generating device

Abstract

The invention relates to a continuous oil pipe underground multi-component thermal fluid generating device and an implementing method. The continuous oil pipe underground multi-component thermal fluid generating device and the implementing method adopt the technical scheme that a multi-passage continuous oil pipe is wound on a continuous oil pipe coiling device, and is connected into an oil well casing through a continuous oil pipe injector arranged on the top of the oil well casing; the bottom of the oil well casing is provided with an underground combustion cavity; a thermistor sensor is arranged inside the underground combustion cavity; an air conveying pipe is arranged inside the multi-passage continuous oil pipe; and a water supply pipe, a fuel conveying pipe, an ignition cable and a thermocouple are arranged inside the air conveying pipe. The continuous oil pipe underground multi-component thermal fluid generating device and the implementing method have the beneficial effects that the defects in the process of injecting multi-component thermal fluid from a wellhead to an oil reservoir are overcome; the multi-passage continuous oil pipe is used for conveying air, fuel, water and electricity to underground positions; the fuel combusts in the oil reservoir position; the generated high-temperature high-pressure multi-component thermal fluid is injected into an oil layer; and the goal of efficient thick oil thermal recovery is achieved.

Description

technical field [0001] The invention relates to downhole coiled tubing operation equipment, in particular to a coiled tubing downhole multi-element thermal fluid generating device. Background technique [0002] At present, the coiled tubing widely used in oil fields is a single-channel flexible coil, which is mainly used for the operation of transporting a single medium. The multi-element thermal fluid generator is developed in recent years for thermal recovery of heavy oil in oilfields to generate water vapor, CO 2 Gas, N 2 The ground device of high temperature and high pressure mixed fluid is mainly composed of raw material supply system—that is, water, fuel, air, electricity supply device and multiple thermal fluid generation device—that is, ignition combustion device and water spray temperature control device. Compared with the current high-pressure (21Mpa) steam boiler, the multi-element thermal fluid generator is smaller in size, lighter in weight, high in thermal ef...

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Problems solved by technology

[0003] The first is heat loss. The oil layer is generally below 1,000 meters. The temperature of the multi-component thermal fluid at the wellhead is generally about 300°C. When it is transported to the oil layer through a tubing of more than 1,000 meters, the temperature is generally about 240°C. The heat energy utilization rate is low and the energy loss is large.

[0004] 2. High requirements for oil well completion

Due to heat conduction, the heat lost by the multi-component heat fluid from the wellhead to the oil layer will increase the temperature of the tubing and well casing, causing the casing in the wellbore to expand and elongate. If the oil well casing is not completed by thermal recovery prestressed cementing, the wellhead will rise 0.4m - 1m, therefore, the cementing quality of wells injected with multiple thermal fluids on the surface is high and the cost is high, which limits the application of conventional cementing and completion of old wells

[0005] 3. The multi-element thermal fluid severely corrodes the tubing and casing

The injection of multi-element thermal fluid cannot be realized in this equipment, and the cementing quality requirements and high cost of wells injected with multi-element thermal fluid on the ground limit the application of conventional cementing and completion of old wells

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