Lost Circulation Specialists, Inc.

Permeability Plugging Test Procedure

1. Apply a thin coating of stopcock great completely around the o-rings of the floating piston. Screw the floating piston onto the T-bar wrench and install the piston into the bottom of the cell, working it up and down to ensure that the piston moves freely. (The bottom of the cell will have a shorter recess than the top). Position the piston so that it is near the bottom edge of the cell and unscrew it from the wrench.

2. Install the hydraulic end cap onto the bottom of the cell. Press in on the back pressure ball on the stem of the hydraulic end cap to relieve pressure and allow the cap to slide on easier. Install the set screws and hand tighten.

3. Turn the cell upright and fill cell with 175 ml of 11.6 ppg CaCl2. Install the metal spacer ring on top of the rubber o-ring. Set the aloxite disk of the desired permeability on top of the metal spacer ring. NOTE: The aloxite disks should be soaked for at least five minutes in 11.6 ppg CaCl2 prior to use. ALOXITE DISKS SHOULD NEVER BE RE-USED. (RI3 ALOXITE DISK)

4. Install the top cap w/ valve onto the cell and tighten the set screws. Close the valve and install the cell into the heating jacket, lowering it slowly until it bottoms out. Rotate the cell clockwise until it locks in place.

5. Install a needle thermometer in the top of the cell in the small hole provided. Place the filtrate reservoir onto the top of the valve ensuring that the small o-ring is in good condition and lock the reservoir in place by installing a safety key (modified cotter key). Install the back pressure device onto the reservoir and lock it in place with a safety key.

6. Open the valve directly on top of the cell (green valve) and ensure the other valves are closed on the reservoir and back pressure devices. Apply the appropriate amount of back-pressure to the cell for the desired test temperature using the CO2 back pressure device. Refer to API RP13B "Recommended Practice Standard Procedure for Field Testing Drilling Fluids" 1988 Edition Table 3.1 for the recommended minimum back pressure to be held. Once the back pressure is applied, close the valve on the cell (green valve) and trap the pressure. Install the quick connect from the hydraulic pump to the hydraulic end of the cell (bottom end). Leave the black valve on the pump open.

7. Open the valve on the cell (green valve). Close the valve on the pump (black valve) and apply the desired pressure to the cell with the pump. Once the desired pressure is applied, open the valve on the reservoir and collect the mud and/or filtrate that comes out in a graduated cylinder. Continue to collect the liquid until the reservoir blows dry. This should be recorded as the spurt loss. NOTE: If you suspect a high leakoff, using a plastic beaker may prevent an excess of liquid from running out of the graduated cylinder and spillage of hot mud.

8. Close the valve on the reservoir and maintain the desired pressure on the cell with the hydraulic pump. Most of the pumps leak slightly so you will frequently have to apply hydraulic pressure to the cell to maintain a constant pressure. After obtaining an initial spurt loss, maintain the pressure on the cell for 30 minutes occasionally bleeding off liquid collected in the reservoir. After 30 minutes is complete, record the total amount of liquid recovered (excluding the spurt loss).

9. Release the pressure on the hydraulic pump (black valve) and close the top valve (green valve). Remove the hydraulic quick connect from the cell to the pump. Bleed off the back pressure and remove the back pressure device and repeat the same for the reservoir. Remove the reservoir from the top of the cell and clean same. Turn off the heating jacket and allow the cell to cool or remove it from the jacket and cool it off with cold water. Open the top valve (green valve) slowly to remove tapped pressure. Repeat this process several times to ensure that all the pressure is removed from the cell. Remove the top cap of the cell and turn the cell upside down. Remove the hydraulic end cap (bottom cap) to expose the floatingpiston. Screw the T-bar wrench into the piston and push down in order to force the mud and disk out the opposite end of the cell. NOTE: This may cause mud to
splatter out if too much pressure is applied.

10. Recover the aloxite disk and filter cake and wash off same very lightly with fresh water and measure the filter cake thickness. The total fluid loss is calculated as follows:

Total Fluid Loss = Spurt Loss (ml) + 2 x (30 minute fluid recover)

The total fluid loss and filter cake thickness should be recorded on the mud sheet daily for trend analysis purposes. Whole mud and filtrate recovery should be differentiated in the spurt loss and 30 minute recovery when possible.

11. Completely disassemble the cell and clean the entire apparatus.

Test #1

175 ml 11.6 ppg CaCl2

25 ppb Magma Fiber Coarse

Spurt Loss

44 ml

Cake Thickness: 8/32

15 min

46 ml

20 min

50 ml

30 min

35 ml

 

Test #2

175 ml 11.6 ppg CaCl2


5 ppb Polydrill
25 ppb Magma Fiber Coarse

Spurt Loss

48 ml

Cake Thickness: 14/32

15 min.

37 ml

20 min.

50 ml

30 min.

40 ml

 

Test #3

175 ml 11.6 ppg CaCl2

25 ppb Magma Fiber Fine

Spurt Loss

45 ml

Cake Thickness: 9/32

15 min.

53 ml

20 min.

52 ml

30 min.

25 ml

 

Test #4

175 ml 11.6 ppg CaCl2


5 ppb Polydrill
25 ppb Magma Fiber Fine

Spurt Loss

45 ml

Cake Thickness: 14/32

15 min

80 ml

20 min

10 ml

30 min

15 ml

45 min

25 ml

 

Test #5

175 ml 11.6 ppg CaCl2


3 ppb HEC (Prehydrated w/ IPA)
25 ppb Magma Fiber Fine

Spurt Loss

25 ml

Cake Thickness: 6/32

Cell held 700 psi

Differential Pressure


15 min.

45 ml

20 min.

15 ml

30 min.

45 ml

45 min.

45 ml

 

Test #6

175 ml 11.6 ppg CaCl2


3 ppb HEC (Prehydrated w/ IPA)
25 ppb Magma Fiber Coarse

Spurt Loss

30 ml

Cake Thickness: 5/32

Cell held 1200 psi

Differential Pressure

15 min.

25 ml

20 min.

20 ml

30 min.

30 ml

60 min.

40 ml

90 min.

30 ml

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