Optical fiber sensing method for synchronously testing temperature and pressure below horizontal well

Abstract

The invention relates to a horizontal underground temperature and pressure synchronous test optical fiber sensing method which belongs to the thick oil heat extraction and horizontal section profile temperature and pressure synchronous test field. The invention performs temperature and pressure test by using optical cable special equipment to run a test optical fiber into a perforation section of a horizontal well oil layer provided with a sealer. The method is not limited by direction and angle during the test process; temperature and pressure balance is not affected, test precision and transmission effect are not affected by a wellbore, and simultaneous identification of horizontal section temperature and pressure can be realized; moreover, the optical fiber and optical fiber equipment used have the advantages of large transmission capacity, quick speed, strong electromagnetic resistance and geomagnetic resistance, and capability of directly reading and storing test parameters on the ground.

Description

Technical field: [0001] The invention relates to an optical fiber sensing method for synchronously testing the temperature and pressure in a horizontal downhole, belonging to the field of synchronizing the temperature and pressure of a horizontal well section during thermal exploitation of heavy oil. Background technique: [0002] At present, the downhole testing in the field of oil exploitation technology at home and abroad mainly adopts the downhole recording method of mechanical sensing, and relies on the gravity downhole and vertical movement recording test methods. Since the above-mentioned device is only suitable for oil wells with a vertical angle of less than 10 degrees during testing, in addition Although the electronic sensor ground recorder can be tested in wells with large angles, the operating temperature of this type of instrument is only suitable for oil wells within 260 °C. With the development of oil fields, some highly deviated and horizontal wells appear du...

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Problems solved by technology

[0002] At present, the downhole testing in the field of oil exploitation technology at home and abroad mainly adopts the downhole recording method of mechanical sensing, and relies on the gravity downhole and vertical movement recording test methods. Since the above-mentioned device is only suitable for oil wells with a vertical angle of less than 10 degrees during testing, in addition Although the electronic sensor ground recorder can be tested in wells with large angles, the operating temperature of this type of instrument is only suitable for oil wells within 260 °C. With the development of oil fields, some highly deviated and horizontal wells appear due to the limitation of well depth. The above method for testing can no longer meet the actual needs

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