Device for measuring dryness of thermal recovery well and method thereof

Abstract

The invention relates to a technology for measuring downhole dryness, especially to a device for measuring dryness of a thermal recovery well and a method thereof. the invention is characterized in that the device at least contains a body; a source connecter, a source shielding sleeve, a source cylinder welded joint, a lower sealed taper and a plugging taper are respectively fixed inside the bodyand are distributed along the axis of the body back and forth; a radioactive source assembly is equipped with a radioactive source gamma ray; the radioactive source assembly is arranged inside the source shielding sleeve; side surface of the source shielding sleeve absorbs the gamma ray; the radioactive source assembly radiates along one opening of the source shielding sleeve; axial opening guarantees axial emission of the radiation; a sample window is fixed along the axial direction; the thickness of the sample window is the same with that of a detected medium; the other end of the sample window is the source connector; when the gamma radiation emitted from the gamma radioactive source passes through the sample window, steam of the sample window absorbs the gamma radiation; and after attenuation, the gamma radiation enters the source connector and is received by a gamma ray assembled probe. The device provided by the invention has high measuring precision and can be used to timely grasp dynamic change of oil reservoir during the injection-production process.

Description

technical field [0001] The invention relates to the measurement technology of downhole dryness, in particular to a thermal recovery well dryness measurement device and method. Background technique [0002] The measurement of dryness in the dynamic monitoring of thermal recovery wells is an important factor for the heat transported to the acquisition layer. The dryness is of great significance in understanding and analyzing the effect of steam injection and improving the production of steam injection wells. Dryness measurement is helpful to improve the design level of steam injection reservoir engineering, high-quality implementation of production allocation and injection plan, timely grasp of reservoir dynamic changes during injection and production, and ensure the success of steam huff and puff and steam drive. [0003] Although dryness is very important in thermal recovery well measurement, there is no effective direct measurement method. There are two commonly used dryne...

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Problems solved by technology

In this kind of calculation, the temperature and pressure are measured by downhole instruments, and the thermal insulation coefficient of the steam passing through the heat insulation sleeve used in the dryness calculation is a parameter that cannot be measured specifically, and can only be estimated manually; the cement sheath The thickness is also an estimated value; in addition, the calculation of the dryness is also related to the ground environment temperature, wind force, etc. Many uncertain factors and human participation greatly reduce the accuracy of the measurement of the dryness, so that it cannot guide production practice

[0005] The second is to take samples in the wellbore for analysis and testing. Not only the error is large, but it is only one point, and the average dryness cannot be measured.

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