A downhole crude oil water content detection device based on coplanar microstrip transmission line method

Abstract

The invention relates to an underground crude oil water content detection device based on a coplanar microstrip transmission line method, and belongs to the technical field of measurement. The underground crude oil water content detection device comprises an instrument case, wherein a sensor is arranged in the instrument case, one end of the instrument case is provided with a liquid inlet hole, the two sides of the instrument case are respectively provided with liquid outlet holes, the sensor is arranged on a flow passage from the liquid inlet holes and the liquid outlet holes in the instrument case, the sensor comprises a rectangular copper clad plate, a coplanar microstrip transmission line in S-shaped arrangement is arranged on the rectangular copper clad plate, the starting end and the terminal end of the coplanar microstrip transmission line are respectively connected with a high-frequency phase difference detection circuit through a radio frequency coaxial cable, the high-frequency phase difference detection circuit is connected with a water content calculation circuit, and the water content calculation circuit is connected with a computer through a data transmission system. The device provided by the invention has the advantages that a coplanar microstrip transmission line sensor is used for measuring the crude oil water content, and the size of the coplanar microstrip transmission line is small, so the structure is simple, and high-temperature resistance and high-pressure resistance are realized.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a detection device for water content of downhole crude oil based on a coplanar microstrip transmission line method. Background technique [0002] In the process of oil extraction, in order to understand the output of each small layer in the injection-production well pattern, it is necessary to place the detection instrument at the corresponding layer downhole to measure the water content. Downhole crude oil water content data can be used to understand the output of each production layer in the oil production well in the injection-production well network, including the type and output of the produced fluid, to know whether the injected water or gas burst occurs, and whether the injection has played a role in flooding. Oil effect, etc., so that the plugging of downhole perforated layers can be adjusted to increase oil and gas production. Therefore, the online real-...

AI Technical Summary

Problems solved by technology

As far as the capacitance method and the conductivity method are concerned, the water content measurement ranges are <30% and 50% to 100% respectively, which do not meet the requirements of full-range detection. Although the density method can detect in the whole range, a small amount of water content in crude oil Gas and sand have a great influence on the measurement results, so they are not suitable for downhole measurement; the ray method has radiation safety problems, and the short-wave method has a complex structure and expensive equipment. The common problems of both are high cost and difficult use and maintenance. Therefore, it has been gradually eliminated by the market; for the microwave method, the size of the detector is large, which does not meet the size requirements of the annulus logging in the production logging; with good resolution

Images