JMZD-2D Sidewall Density Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

The motor retracts and extends the borehole arm and monitors the entire retraction and extension process, which is safe and reliable.
The method of simultaneous measurement of long and short source distance detectors can compensate for unfavorable factors such as mud cakes.
Multi-parameter simultaneous measurement greatly improves work efficiency

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Description

FAQ

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Description

Abstract

JMZD-2D Sidewall Density Probe combines the measurement of focused resistivity parameters (three lateral directions), natural potential parameters, parallel diameter parameters and natural gamma parameters. This instrument can be used in the exploration of oil, coal, gas and other mineral deposits to determine lithology, measure formation porosity, and can also be used to detect the quality of cement cementing outside the casing of production wells.

Applicable Conditions

● Cased

● Bare hole fill with water or mud

Applications

● Quantitative calculation of in-situ formation density

● Exploration and quality evaluation of oil, coal, gas and other mineral deposits

● Determine lithology

● Measuring formation porosity

● Testing the cement cementing quality outside the production well casing

● Borehole diameter measurement and correction calculation in conjunction with other well logs

Features

● The motor retracts and extends the borehole arm and monitors the entire retraction and extension process, which is safe and reliable.

● The method of simultaneous measurement of long and short source distance detectors can compensate for unfavorable factors such as mud cakes.

● Multi-parameter simultaneous measurement greatly improves work efficiency

Specifications

Three lateral electrodes	Stainless steel electrode, Focusing electrode length: 2L=2×0.6m; Focusing main electrode length:L0=0.06m
Natural potential electrode	Lead electrode
Natural gamma detector	Nal crystal, Scattering detector: Nal crystal
Measurement parameters and range	Well diameter: 60~200mm,5%; Natural potential: -1200~+1200 mV, 5%; Focus resistivity: 1.2~1.2×105Ωm, 5%; Natural gamma: 0~32768cps Long source distance: 0~32768cps; Short source distance: 0~32768cps; Density: 1~3 g/ cm³, 3%
Pushing force against wall	>10kg
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?