Instrument

Plugging slurry

Crack width/mm

Pressure changes in mud tanks at different flowback pressures

1

2

3

4

5

6

7

TL-1

1#

1

0

0

0

0

0

0

7

Traditional instrument

0

2

3

4

5

6

7

TL-1

2#

2

0

0

0

0

0

0

7

Traditional instrument

0

0

3

4

5

6

7

TL-1

3#

4

0

0

0

0

0

0

6.5

Traditional instrument

0

0

3

4

5

6

7