JWQ-1 Micro-Spherically Focused Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

Wide dynamic range for accurate measurement
The motor retracts and extends the wellbore diameter and monitors the entire retraction and extension process, which is safe and reliable
The downhole instrument structure is optimized, easy to operate, and the instrument's seismic resistance is greatly improved, making it more durable

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Description

FAQ

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Description

Abstract

JWQ-1 Micro-Spherically Focused Probe adopts a unique electrode system structure and focusing method, so that the resistivity of the flushing zone measured by it is not affected by mud cake or original formation. Therefore, it is currently the most ideal instrument for detecting the resistivity of the flushing zone.

Applicable Conditions

● Bare hole

● Fill with water or mud

Applications

● Accurately divide lithological profiles

● Assess flush zone condition

● Identify formation fissures

Features

● Wide dynamic range for accurate measurement

● The motor retracts and extends the wellbore diameter and monitors the entire retraction and extension process, which is safe and reliable

● The downhole instrument structure is optimized, easy to operate, and the instrument’s seismic resistance is greatly improved, making it more durable

Specifications

Electrode	Stainless steel electrode, Lead electrode
Applicable well diameter	70~300mm;Well diameter measurement accuracy: 2% F.S
Resistivity measurement range	0~2000Ω·m
Resistivity measurement accuracy	Continuous work for 4 hours, its output change ≯3%
Acoustic system	±3% (20~200Ω·m);<±10% (others)
Natural potential measurement range	±1200mV
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?