JSS-2 Compensated Sonic Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

It uses a non-directional transmission and reception method. It uses a single-transmitter and dual-receiver device to reduce the impact of factors such as well diameter.
Send instructions from the ground and execute them from the motor.

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Description

FAQ

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Description

Abstract

Sonic and ultrasonic exploration methods are the fastest growing, most widely used, and most theoretically sound methods in geophysical technology. Sonic logging measures the acoustic characteristics of rock formations along the borehole profile, that is, the propagation and attenuation laws of ultrasound in rocks, so as to understand the properties of rock formations and walls and determine the lithology. JSS-2 Compensated Sonic Probe uses ultrasonic ceramic elements as transmitting and receiving transducers, and is suitable for use in boreholes of 90~Ф150mm.

Applicable Conditions

● Bare hole

● Fill with water or mud

Applications

● Cased Hole Evaluation: Cement Bond Index Logging (CBL)

● Identify lithology and evaluate porosity and permeability

● Evaluation of rock formation fragmentation, rock strength and elasticity

● Calculate rock mechanical properties: elastic modulus, Poisson’s ratio, shear modulus, Young’s modulus, volume elasticity

● Modulus and compression coefficient

Features

● It uses a non-directional transmission and reception method. It uses a single-transmitter and dual-receiver device to reduce the impact of factors such as well diameter.

● Send instructions from the ground and execute them from the motor.

Specifications

Sound system	Non-directional one-shot and two-shot, Source distance 0.5M, Spacing 0.2m
Emitting transducer	P-42 ceramic, Receiving transducer: P-51 ceramic
Sound speed measurement range	125μs/m~555μs/m, Measurement accuracy: 5μs/m
Time base	0.5μs, Time base stability: 0.1PPm
Sound amplitude measurement range	0~2000mV (JSS-3),Measurement accuracy: 2% (JSS-3)
Signal output	Bipolar encoding

FAQ

In gravity exploration (SI), what is the unit of gravity? How to convert gravity units between SI and CGS?

What are gravitational field and gravitational potential?

What is the normal gravity field of the earth? What are the rules for the change of the normal gravity field with latitude and altitude?

① The normal gravity field of the earth: Assuming that the earth is a rotating ellipsoid (reference plane), the surface is glossy, the internal density is uniform, or it is distributed in concentric layers, the density of each layer is uniform, and the deviation of the shape of the ellipsoid from the geoid is very small, then the gravity field generated by the earth is the normal gravity field.
② The normal gravity value is only related to the latitude, the smallest at the equator and the largest at the poles, with a difference of about 50,000 g.u.; the rate of change of the normal gravity value with latitude is the largest at 45° latitude, and zero at the equator and the poles; the normal gravity value decreases with increasing altitude, and its rate of change is -3.086 g.u.. The main feature of the long-term change is the "westward drift" of the geomagnetic elements, both the dipole field and the non-dipole field drift westward, and have a global nature.

What is the relationship between gravitational field strength and gravitational acceleration?

What is gravity exploration?