Assess the risks of wireline cable keyseating and differential sticking with a good degree of confidence.
Optimise the tool-strings and procedures to control cable thrusts and minimize slot-cutting during the logging operation.
Deploy WLSOs using a bespoke plan to cover the sticky zones in the wellbore, without consuming excessive rig time.
Enjoy a cost-effective and safe logging operation: no sticking or fishing, no pipe-conveyed logging and no cancelled samples.
GCPS is a result of many years of intensive "field based" R&D by Gaia. The system is designed to facilitate safe and efficient wireline conveyance in tortuous wellbores which might otherwise result in cancelled surveys, cable fishing, pipe-conveyed logging or additional LWD runs. GCPS is an integrated service, combining Gaia's proprietary conveyance software "Wire-Pro" (linked to our global sticking database), wireline standoff hardware (WLSOs) and petrophysical expertise. GCPS may (or may not) include a plan to deploy WLSOs – depending on the risk profile of the well. To date GCPS has de-risked over 35 critical wireline runs on 19 high profile wells worldwide and saved upwards of $15-20M in NPT: ROI varies from 8:1 to 50:1 depending on the rig-rate and well depth. (Cost of missed data and cancelled sampling points without GCPS not included.)
The demand for GCPS is influenced by three things:
a) The logging environment (wellbore trajectory & BHA, geology & mud, rock mechanics & pore pressures).
b) The wireline conveyance system, and any limitations it may possess (e.g. limited pull on land as opposed to high tension logging systems offshore).
c) The client's desire to minimize their operational & financial risks.
The baseline requirement for cable sticking risk is a tortuous open hole section: a distinct change in hole deviation or azimuth from the Casing Shoe to TD. A deviated but straight open-hole section does not generally create sticking risk unless there is concern over differential sticking over upper (exposed) sands when deep sampling.
Wire-Pro is Gaia's proprietary conveyance software, with a special focus on open hole operations and sticking risks (tools and cable). Wire-Pro facilitates the benchmarking of cable sticking risk at the pre-spud stage and also during drilling (with time-depth). Wire-Pro determines whether wireline standoffs (WLSOs) may be required for a run, how many are needed, and where they should be deployed on the cable. It also assesses the degree of sticking linkage between tools and cable, whereby overpulls to free stuck tools may induce cable sticking, due to higher applied thrusts when cycling the line.
Wire-Pro identifies risks that other conveyance packages cannot, due to its advanced algorithms that integrate cable forces, pore pressures, and available LAS data.
Wireline standoffs (WLSOs) provide a precision mechanical intervention down-hole: dispersing cable thrusts, minimizing cable contact area, and suspending the cable above pre-cut slots.
WLSOs are deployed in arrays (typically @ 40-65 feet space-out) to cover specific sticky zones in the wellbore. The WLSO O.D. is selected according to the pipe size and fishing gear on the rig.
The minimum number of WLSOs deployed to date is 5 and the maximum is 60. (The average number is 28 per run.)
The installation time is less than 2 minutes per WLSO, including winch driving between WLSO stop-depths.
No sign of cable sticking has been seen with WLSOs in-hole; they have never been stripped over for a fishing operation.
GCPS is provided to the client in close collaboration with the logging provider. There is a division of labour with the WLSO planning by a Gaia Conveyance Specialist and the equipment handling by trained crewchiefs. Handover of the hardware to the logging provider is achieved over time, with training in the yard and then at the wellsite.
Intensive service support is provided by Gaia via classroom & workshop training, phone and email, and bulletin board contributions when requested.
Documentation is provided in the form of Field Operating Manual (FOM), Job Safety Assessment (JSA), WLSO run sheets and wellsite QC checklists.
Gaia Earth Technologies Limited is a British consulting firm that provides equipment, software and personnel, to enhance wireline logging performance. A full spectrum of services are offered by GETL: technical & service analysis, modelling & software, design & prototyping.
GETL's current focus is GCPS (Gaia Cable Protection System) with a range of other innovative products and services in development. All solutions offered by GETL are derived from first-hand operational experience, gathered over decades at the front line of worldwide logging operations (including Deepwater, remote, HPHT).
Morayshire IV30 5XZ, UK
Tel: +44 (0) 1343 830617
3356 HWY 182
Morgan City, LA 70342
P.O. Box 1, 413 Moo 5,
Somdet, Kalasin 46150
Kingdom of Thailand
Tel: +66 (0) 91 061 1474