The Model HM Bridge Plug is set using hydraulic power to set the top slips and then mechanical pull to complete the set. The Premium is for high pressure and temperature while the Lite sustains moderate temperature and pressure.
The need for a mechanical setting tool does not exist because the setting mechanism is built-in. A ball is placed in the tubing string plugging off the built-in equalizing ports. Pressure is then applied to set the top slip and then mechanical pull is applied to finish the set. Releasing the tubing string from the plug is done by simply turning to the right.
Full tubing I.D. is available after releasing from the plug allowing other equipment to extend through the end of the tubing string.
- Cast iron construction One piece slip
- Sets in any grade casing including P-110
- Metal back-up to prevent rubber extrusion For temporary or permanent service Ratcheting lock ring holds setting force
- Excellent for deviated wells
Guidelines for Running HM Bridge Plugs:
Recommended Procedure Before Running HM Bridge Plug:
- Run a casing scraper (if necessary) to clean inner wall of casing and free any debris or obstructions.
- Circulate well to clean well of debris and junk.
- Check casing I.D. 2 ft.-3 ft. below setting depth to insure no restrictions exist.
- Make-up Procedure:
- Make up tubing on tubing adapter by placing back-up on tubing adapter and rotate tubing to the right until tight.
- Do not remove tubing adapter from plug to make-up!
- Run into well at uniform rate – no faster than 30 seconds per 90 foot stand. Be certain tubing is free of debris and excessive scale.
- Avoid unnecessary right-hand rotation of tubing string.
- Use slow starts and stops when moving tubing string – no jerking.
Setting HM Plug:
- Run tubing to desired setting point. Never set in collars or where milling has occurred. Set in static conditions (no fluid or gas movement).
- Drop ball down tubing string – the ball should be 1 1/4 diameter. Allow approximately 5 minutes per 1010 feet for ball to travel in water. More time is needed in mud or viscous fluids.
- Apply pump pressure to tubing string until 2000 p.s.i. is reached. This pressure will stroke cylinder down into slip. The slip will break into segments and make contact with casing.
- NOTE: If you lose pressure before reaching 2000 p.s.i., go on to the next step. In heavier weights of casing, slip and hydro sleeve travel is limited which prevents pressure loss. Simply stop at 2000 p.s.i. and proceed to the next step.
- Bleed pressure and pull recommended tension above the pipe weight at the tool, to complete setting the plug. Hold tension for 3 to 5 minutes. It is recommended to calculate tubing stretch versus using weight indicator for true pull. See formula below.
- The tubing string may be released from the H-M Plug by pulling 500 lbs. tension at the tool and rotating the workstring 9 turns to the right at the tool
Special Note: For low fluid level wells
In low fluid level wells, any fluids placed in the tubing after the setting ball has reached it’s seat, will tend to shear the cylinder downward on the HM Bridge Plug. Chart #1 shows the pressure created in psi per barrel of fluid added, and Chart #2 shows the feet of fill-up per barrel of fluid added. Since 2010 psi pressure in favor of the tubing at the tool is required to initiate the setting sequence, we suggest the following method for calculating the required applied pump pressure.
- Determine fluid weight in pounds per gallon (#/gal) or p.s.i. per foot (psi/ft).
- Estimate fluid level from surface of well. NOTE: The tubing string will fill during running in through the fluid fill ports.
- From Chart #1, select the appropriate column for the size of tubing string and line for appropriate fluid weight.
- From Chart #2, select the appropriate column for the size of tubing string and determine the lineal feet per barrel of fluid.
- Multiply the depth of fluid level from surface by the lineal feet per barrel from Chart #2 to determine the required amount of barrels of fluid to fill the tubing string.
- Multiply the barrels required to fill the tubing string by the psi. barrel figure from Chart #1. This figure will give you the total hydrostatic head exerted by the fluid in the tubing string when completely filled. If this figure is less than the required 2010 psi., sufficient pump pressure must be added to achieve the 2010 p.s.i. required pressure. In those cases where the calculated pressure for the fluid to fill the tubing string exceeds the required 2010 p.s.i., you need only to add or fill with the necessary barrels of fluid to achieve the required 2010 p.s.i. This may be calculated by dividing 2010 p.s.i. by the psi. per barrel figure from Chart #1. Over pressuring cannot occur since the tool will be activated at 2010 p.s.i. and the downward travel of the cylinder will vent the excess fluid into the annulus above the plug before damage occurs. Once the required pressure is created at the plug, sufficient tension must be applied as shown in step #4 under setting H-M plug. Complete setting sequence as described in step #5.