Acoustic system structure of acoustic velocity-segmented cement bond logging tool and logging method

A technology of cement cementation and division into sectors, which is applied in wellbore/well components, measurement, earthwork drilling and production, etc., to reduce production operation costs and improve use efficiency

Inactive Publication Date: 2011-05-25
杭州瑞利声电技术有限公司
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Problems solved by technology

However, when the specific gravity of the mud in the well is too large (close to the specific gravity of cement) and the acoustic impedance is similar or too small (0.1-1.0) and the acoustic impedance is very different, it is easy to cause misjudgment only by the sound amplitude

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  • Acoustic system structure of acoustic velocity-segmented cement bond logging tool and logging method
  • Acoustic system structure of acoustic velocity-segmented cement bond logging tool and logging method
  • Acoustic system structure of acoustic velocity-segmented cement bond logging tool and logging method

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0015] The present invention refers to the attached figure 1 , 2 Be explained. Use the transmitting probe 1 (XMIT), the sector receiving probe 2 18 inches away from the transmitting probe, the SEC R (S1~SN), and 5 receiving probes R1~R5 equally spaced between 3 feet and 5 feet away from the transmitting probe. (3-foot receiving probe 3, 3.5-foot receiving probe 4, 4-foot receiving probe 5, 4.5-foot receiving probe 6, 5-foot receiving probe 7) and temperature probe 8 (TEMP) constitute the sound system. The special sound system composition of this design well solves various problems that may arise during the evaluation of cement bonding quality. At the same time, it can provide high-resolution acoustic signals with depth-shifting borehole compensation for exploration wells.

[0016] When this design is used for engineering logging, in addition to detecting ...

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Abstract

The invention discloses an acoustic system structure of an acoustic velocity-segmented cement bond logging tool and a logging method. The acoustic system consists of a transmitting probe, a segmented receiving probe 18 feet away from the transmitting probe, five receiving probes and a temperature probe, wherein the five receiving probes are 3 to 5 inches away from the transmitting probe respectively, and are distributed at an equal interval. In the logging method used for cement bond logging, an acoustic amplitude cement bond logging (CBL) signal and a variable density logging (VDL) signal are detected; the segmented receiving probe 18 feet away from the transmitting probe is arranged, and consists of N radial probes, and each probe covers a radial 360/N-degree range of the circumference of a sleeve; and a real-time temperature curve in a well is detected by the temperature probe to accurately evaluate bond quality. The acoustic system structure and the logging method have the advantages that: high-resolution acoustic velocity logging and segmented cement bond logging are integrated so as to overcome the shortcomings of the conventional product, increase the utilization rate of the logging tool and reduce the production operation cost.

Description

technical field [0001] The invention relates to the field of acoustic well logging, and mainly relates to a sound velocity, sectoral cement bonded well logging instrument sound system composition and a well logging method. Background technique [0002] The main problem to be solved in exploration logging is to obtain the porosity, oil and gas saturation and permeability of the formation. At present, one of the main means of obtaining formation porosity is sound velocity logging; in terms of oil and gas indications, especially gas indications, sonic logging is very sensitive; in terms of permeability, it can also be obtained by exciting Stoneley waves; in addition , some formation mechanical characteristic parameters such as formation stress direction can also be obtained through sound waves, which can be used to guide drilling. [0003] Cement bonding logging is used to evaluate the bonding quality of casing and cement and the bonding quality of formation and cement. It can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/14
Inventor 吴建农张晓红欧阳洋张佳伟
Owner 杭州瑞利声电技术有限公司
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