Extended Reach Difficulty Index Software

Extended Reach Drilling Engineers and Drilling Consultants

Fill out the form below to generate an Extended Reach Difficulty Index score and find out how difficult your well is.

After you have entered in your results you will be shown a chart that generates your score and plots your results along with the results of other wells. This will give you a relative picture of how difficult your project will be within the industry.

If you want to edit or review past results, please click the links to the right: >>

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Well Name: *
Field:
Area:

Enter Depth Units Below	Information/?Help
Feet Meters

Well Path 1-4c ?help

1 *	TVD at TD
2a *	TVD below mudline at TD
2b *	Horizontal Reach at TD. For complex or 3-D wells, use "unwrapped" total length projected onto the horizontal plane (e.g. a 180 deg turn back toward the platform will add additional "horizontal reach")
3a *	Cumulative Planned Dogleg at TD (degrees) for 3-D, S-Turn, Horizontal, or Double-Build well (enter zero for vertical well or simple Build and Hold)
3b	3-D well with horizontal section? (Adds 3 extra points)
4a *	Smallest Target Width, perpendicular to well azimuth (for horizontal well, use target height if it is smaller than width)
4b *	Measured depth at target
4c	Motor steering is readily effective at target depth, or a rotary steerable system is used to hit target?(Subtracts 2 points for small target/MD ratios < 15)

Mud/Temp/Press 5-9c ?help

5 *	Highest Planned Mud Weight, ppg
6 *	Highest planned OBM MW, ppg (Enter zero if oil/synthetic mud is not used)
7a *	Highest Planned Mud Overbalance, psi (annulus - formation pressure)
7b	Under-balance drilling with live hydrocarbons?: (If true 7a will be set to 0)
8 *	Bottom Hole Static Temperature, degrees F Fracture gradient v ECD in holes under 8 1/2"
9a *	Number of 8-1/2" or smaller sections where FG-ECD = 1.5 to <2.0 ppg
9b *	Number of 8-1/2" or smaller sections where FG-ECD = 1.0 to <1.5 ppg
9c *	Number of 8-1/2" or smaller sections where FG-ECD < 1.0 ppg

Casing/Redrill 10a-11g ?help

10a *	Number of new casing strings/liners below structural/drive casing (For redrills, do not count existing strings which are reused) (Max 6)
10b *	Number of liners tied back (adds one point each)
10c *	Number of strings requiring rollers, simple floatation, and/or "inverted string weight" to slide into hole (adds one point for each string). Do not include strings where mud over air floatation or rotation is required (see next item)
10e *	Number of strings requiring mud over air floatation and/or rotation to slide into hole (adds two points for each string)

New Well v Re-Drill

11a	New well? (if TRUE, items b through g are FALSE) asdfsd
11b	Cased-hole-whipstock kickoff? (if TRUE, items c and d are FALSE)
11c	Cement plug kickoff? (if TRUE, items b and d are FALSE)
11d	Drive-pipe-whipstock slot recovery? (if TRUE, items b and c are FALSE)
11e	Casing string(s) cut and pulled? (FALSE if Drive-pipe-whipstock is used)
11f	Casing string(s) section milled? (FALSE if Drive-pipe-whipstock is used)
11g	Casing string(s) pilot milled? (FALSE if Drive-pipe-whipstock is used)

Well Type 12a-13d ?help

Well Learning Curve?

12a	Rank Wildcat?
12b	Near Field Wildcat (applicable experience in the general area)?
12c	1st well in a development program (or gone for 2 yrs or more)?
12d	2nd well in a development program (or gone for 1 yr to <2 yr)?
12e	3rd well in a development program (or gone for 6 mo to <1 year)?
12f	4th well or greater in a development program?

Drlling System Type

13a	Typical land well?
13b	Jackup or Platform with surface wellhead system?
13c	Surface BOPs with some subsea hangers (mudline suspension, and some deepwater TLP/Spar systems)?
13d	Floater with subsea BOP and wellhead?

Program/Rig 14a-16c ?help

Rig and Drilling Equipment Capacity

14a	Extra capacity all around (no significant operating limitations)?
14b	At capacity in a few areas (some operating compromises, e.g. lower than ideal flowrate in protective hole due to solids control capacity)?
14c	Under sized rig (significant impact on well design and/or operations, e.g. slim casing program, laying down long sections of drill pipe on trips, running casing off workboat, etc.)?

Rig Learning Curve Issues

15a	The rig is brand new or has been stacked within the last 90 days (if stack duration was 3 months or greater)?
15b *	If item a. is true, time between rig activation date and well spud, days (4 pts. 0-30 days; 2pts. 31-60 days;1pt 61-90 days)-- leave blank if 15-a is False
15c	The rig and crew have NOT worked for the operator's local drilling group within the last two years? (2 points if true)

Special Situations - enter description and points

16a *
16b *
16c *

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