Quartz Pressure / CCL Tool

General Description

The Quartz Pressure / CCL Tool is an integrated cased-hole logging instrument combining high-accuracy quartz pressure sensor and Casing Collar Locator (CCL) in one tool body. It is widely deployed in production logging, pressure transient testing and well monitoring operations.

The quartz pressure transducer delivers superior pressure precision and long-term stability compared with conventional strain-gauge sensors. The integrated CCL provides casing collar position marks for accurate depth anchoring. This combined tool eliminates the need for separate CCL cartridge, shortening overall tool-string length. It supports real-time surface readout and memory-mode logging for static pressure, flowing pressure and pressure build-up surveys.

Working Principle

A high-performance quartz crystal transducer converts borehole pressure into frequency-based electrical signals. Downhole electronics digitise pressure data with high resolution. The electromagnetic CCL unit consists of transmitter-receiver coils. When passing casing collars, distortion of magnetic flux generates sharp voltage spikes to mark casing joint depths. All pressure and depth reference signals are transmitted to surface or stored in on-board memory.

Key Features

◆  Quartz pressure sensor: high accuracy, low drift, excellent for pressure transient analysis.

◆ Built-in CCL for depth calibration; reduces tool-string assembly length.

◆ Operate for flowing pressure, static pressure, pressure build-up and fall-off tests.

◆ Compact outer diameter, compatible with wireline and slickline operations.

◆ Can be run standalone or concatenated with flowmeter, holdup and gamma-ray instruments.

Typical Applications

◆ High-precision static & flowing pressure measurement in producers and injectors 

◆ Pressure build-up / drawdown test for reservoir dynamic evaluation  

◆ Depth reference via CCL signature for downhole pressure-test data

◆ Monitor reservoir pressure depletion over well life

◆ Locate completion hardware such as packers, perforations and tubing joints 

◆ Used in PLT surveys and well diagnostic jobs

Typical Technical Specifications