Downhole coiled tubing operating equipment

Abstract

The invention relates to downhole coiled tubing operating equipment. According to the technical schemes, a multi-channel coiled tubing is wound on a coiled tubing coiling device, and the multi-channel coiled tubing is connected to the interior of an oil well casing through a coiled tubing injector at the top of the oil well casing; a downhole combustion cavity is formed in the bottom of the oil well casing; a thermistor sensor is arranged in the downhole combustion cavity; an air conveying pipe is arranged in the multi-channel coiled tubing; and the air conveying pipe is internally provided with a water supply pipe, a fuel conveying pipe, an ignition cable and a thermocouple. The downhole coiled tubing operating equipment has the beneficial effects that in order to overcome the deficiency existing in the process of injecting multiple thermal fluid from a wellhead to an oil layer, the multi-channel coiled tubing is adopted to convey air, fuel, water and electricity to a downhole correspondingly, the fuel is combusted in the position of the oil layer, the high temperature and high pressure multiple thermal fluid is generated and injected into the oil layer, so that the purpose of high efficiency and thermal recovery of thickened oil is achieved.

Description

technical field [0001] The invention relates to downhole coiled tubing operation equipment. 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 efficiency and energy saving, and the tail gas after combustion is injected into the format...

AI Technical Summary

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

Images