Shale swelling (mud capillary water absorption time) tester

Shale swelling (mud capillary water absorption time) tester(General Manager of China)

In the process of testing chemical treatment agents in natural gas shale oil fields, the rock physical properties, swelling and erosion characteristics, mud dispersibility inhibition ability, drilling fluid anti swelling ability, etc. of the samples are evaluated by measuring the mud capillary water absorption time CST, and determining the type and dosage of treatment agents.

CST test

Due to the extremely low matrix permeability in natural gas shale, core permeability testing cannot be conducted. The capillary water absorption time (CST) test is used as a method to evaluate the fluid sensitivity of granular samples (such as rock debris), and the ratio of the CST response of fresh water to the response of 7% KCl is used to demonstrate the observed results through random sampling.

In the test, 5 grams of -70 mesh material were placed in 50 milliliters of test solution and stirred with a magnetic stirrer for 2 hours, followed by CST testing. Extract 5 milliliters of slurry with a syringe and place it in a cylindrical funnel on porous filter paper. When the advancing fluid reaches the first sensor, the timer starts counting, and when the fluid reaches the outer sensor, the timer stops counting. Record CST time in seconds and calculate CST ratio by subtracting blank time (fluid only) from sample time and dividing by blank time. Repeat the test three times and take the average. This type of test is often used in the evaluation and characterization of sludge.

304B CST tester

■ Overview:

The AC switch located at the top of CST can enhance its lifespan and reliability

The easy-to-use PP3 9V battery can be used continuously for about 100 hours

● LCD display

● Audio display usage, stop and fault status

The instrument and accessories are placed in a sturdy plastic box for easy carrying

The design and testing of the instrument follow European and American EMC standards

■ Specifications:

Box size: 33 × 26 × 5.5cm

Weight: 1.75kg

■ Composition:

CST tester

Organic glass component device and stainless steel funnel

20 directly usable filter papers

● Backup PP3 9V battery

304M CST tester

■ Overview:

● It is a basic laboratory CST testing instrument

The design and testing of the instrument follow European and American standards

The power input supply is suitable for any standard.

■ Specifications:

Box size: 22 × 16 × 7cm

■ Composition:

CST tester

Organic glass component device and stainless steel funnel

200 filter papers per box

319 Multi functional CST Tester

■ Overview:

The 319 model can use either one multi ring multi radius testing probe or one or up to five single ring testing probes in combination for rapid evaluation of filtration resistance.

● Complete Midea Laboratory CST Testing Instrument

● LCD display

● Audio display usage, stop and fault status

The design and testing of the instrument follow European and American standards

● Power input supply suitable for any standard

Single loop test probe

In this operating state, several samples can be measured simultaneously, shortening the entire testing time. Each sample's measurement is extremely similar to the 304B and 304M models.

Multi ring and multi radius testing probe

The multi ring multi radius testing probe has 5 sensors with set interval times, and the volume provided between each sensor is the same. As shown in the above figure. By using standard funnels and multi ring multi radius testing probes, it can be concluded that there is a linear relationship between the specific filtration resistance of different types of sludge over a wide range. When using a multi ring test probe, the tester automatically divides the time based on the number of electrodes. Due to the parabolic relationship between time and filtered liquid volume in the filtration process, the difference in readings is constant (for different filter papers) and directly proportional to the filtration resistance.

■ Composition:

● Multi functional CST tester

● Single loop test probe

● Multi ring testing probe

200 filter papers per box

Organic glass component device and stainless steel funnel