Production Related Questions

Q: What is the correlation tool (Gyro, MWD, etc….) ?

The tool uses gyro with telemetry.

Q: Due you need special connection for the BHA?

No. The tool uses Standard API connection. It can work with 1” to 3 •” tubing but 1” is not desirable as it has too little flow and all processes take much longer to work and the preferred tubing sizes are 2 3/8” or 2 7/8”)

Q: How we can cure the losses if any (is there any limitation for LCM)?

No limitation for loss control management (LCM). The system uses an under-balanced drilling apparatus and LCM procedures are industry standard. Losses into formation would not occur:

1. Terra Seal of Casing; in this situation formation is not exposed.

2. PowerSlotting for Production Improvement; in this situation the formation is exposed; however formation pressure must always exceed hydrostatic pressure.

Q: Does REDUX need a rig to do the job or a coiled tubing unit is enough and acceptable?

Either a work over rig or coiled tubing rig will work.

Q: How will the tool be operated? Hydraulically, Mechanically etc.

Cutting function and well-bore anchors operate hydraulically. Positioning and data transfer operate electronically and mechanically. Remainder of machine operates mechanically.

Q: What are the available tools sizes?

The minimum size of 4 inches/102 millimeters is the minimum requirement for the inside diameter of the casing. No maximum but the present largest tool in stock is for a maximum OD casing of 12”.

Q: Can the service be run via wire-line or slick-line?

No as a matter of fact that there is pumping while doing the service. It can be done via drill pipe or coiled tubing only. We must pump slurry though drill pipe (API 2-3/8 inch OD minimum), production tubing (J-55,API 2-3/8 inch OD minimum), or coiled tubing (2-inch minimum) – CT injector head must exceed 3.875-inch minimum.

Q: After doing the excavation, how will it be guaranteed that the formation will not collapse?

The slot is engineered before the operation. The forces causing rock collapse (function of formation pressure and rock strength) < (are less than) forces keeping cut window open. The slot forces are > (are greater than) minimum window size necessary for pressure unloading. It is all calculated in advance in the computer model. The window size is calculated to be strong enough to resist closure from total forces of formation stresses, and strong enough to unload well-bore stress in near-well-bore zone. The unnatural slot shape stays open for this reason. In high-pressure or softer rock formations, the window slice is much smaller than in low-pressure or harder formations. If there is concern, or for precaution, we can fill the window cavity or void with resin-coated sand (RCS) but usually this step is not necessary.