JFS-2 Casing Collar Locator & Natural Gamma Probe

PRODUCT PARAMETERS

Downhole measurement, signal amplification, and digitization
High reliability, high measurement accuracy, and easy to use

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Description

FAQ

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Description

JFS-2 Casing Collar Locator & Natural Gamma Probe

Abstract

JFS-2 Casing Collar Locator & Natural Gamma Probe is composed of a Nal body and a photomultiplier tube to form a natural gamma ray detector, which measures the total amount of natural gamma rays; at the same time, the instrument is also combined with a magnetic positioning detector to detect and locate the distribution of magnetic pipe strings (casing, downhole tools, flower pipes, screens, collars, packers, etc.) at depth. It can also be used in various production wells, cementing, perforating, well repair, casing corrosion monitoring and other occasions.

Applicable Conditions

● Borehole with case

● Bare hole fill with water or mud

● Bare Dry hole

Applications

● Casing coupling locator

● Divide stratigraphic interfaces and determine changes in stratigraphic facies

● Determine fine-grained/coarse-grained change sequence

● Determine the location and thickness of aquifers

● Estimate uranium concentration

Features

● Downhole measurement, signal amplification, and digitization

● High reliability, high measurement accuracy, and easy to use

Specifications

Gamma ray detection sensor	Nal crystal + photomultiplier tube
Gamma ray detection and counting range	0~65000cps, accuracy: 5%F.S
Gamma ray detection energy threshold	>0.06MeV
Magnetic positioning sensor	65mm electromagnetic sensor
Magnetic positioning measurement range	±2500mV
Applicable well diameter	Φ50~Φ150mm
Output signal	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?