In late February, Weatherford completed a drilling and reaming project near Sakhalin Island, Russia, that resulted in 52 hours of rig time saved.The operator contracted Weatherford to enlarge a 3,641-ft (1,110-m) hole section from 8½- to 9½-in. on an offshore development well.
The company deployed a dual-reamer bottomhole assembly including a RipTide drilling reamer and a RipTide rathole killer drilling reamer.Radio-frequency identification (RFID) tags enabled both reamers to be opened and closed remotely and selectively throughout the run, Weatherford said, allowing the crew to drill and ream the hole section to a total depth of 14,629 ft (4,459 m), eliminate the rathole, and clean the wellbore in a single trip.
According to the company, by removing the need for a dedicated cleanout trip, which takes an average of 52 hours in this field, the RFID tools produced significant value in terms of time, cost, and operational efficiency.
RipTide® Rathole Killer® Drilling Reamer
Activated by both RFID technology and pressure cycling to simultaneously drill and enlarge wellbores while minimizing ratholes
RipTide® Rathole Killer® Drilling Reamer
Features and Benefits (continued)
• By giving operators the capability to under ream the rathole section,the reamer eliminates a trip out of the wellbore for a dedicated cleanout run, which saves rig time.
Tool Description
Once total depth is reached, the secondary reamer is activated with a pressure cycle, which opens or closes a solenoid- operated valve to lock or unlock the reamer. By placing the secondary reamer above the drillbit, the rathole is reduced to the length of the bit and the RSS.
The Weatherford RipTide Rathole Killer drilling reamer is a concentric mass-balance underreamer capable of enlarging wellbores below casing restrictions. The reamer can simultaneously drill and enlarge wellbores when used in conjunction with rotary-steerable systems (RSS) or rotary BHAs.
In addition to underreaming existing boreholes and opening selective zones for solid expandable installations, the reamer minimizes ratholes. The RipTide drilling reamer enables running dual reamers in the same drillstring with a full-bore ID. The primary reamer is placed above MWD or LWD tools. The secondary reamer is placed below the MWD or LWD tools and above the drillbit and RSS.
Both reamers can be independently activated or deactivated multiple times on demand using RFID technology and hydraulic pressure.The primary reamer is activated using RFID technology. An RFID tag is dropped into the drillpipe ID at surface level and is carried downhole in the drilling fluid. The tag transmits instructions to an electronic reader on the reamer controller. The cutter blocks then extend from the reamer body to simultaneously drill and enlarge the wellbore.
Applications
•Drilling and enlarging wellbores simultaneously in a single trip
•Under reaming concentric boreholes below casing restrictions to facilitate running casing strings and to permit a larger intermediate casing diameter
•Expanding existing pilot holes in a wide range of formations
•Reducing annular fluid velocities to effectively manage equivalent circulating density and to minimize the risk of kicks
•Facilitating solid expandable installations and openhole, gravel-pack, and oversized-liner completions
•Optimizing cementjobs
•Minimizing ratholes
Features and Benefits
•The Rip Tide Rathole Killer drilling reamer gives operators the capability to run dual reamers—using two methods of activation—in the same drillstring with a full-bore inside diameter (ID). This enhances operational efficiency and flexibility, and reduces drilling time.
•Both activation methods—radio frequency identification(RFID)and pressure cycling—provide on-demand control for nearly unlimited activation and deactivation when tripping and drilling.
•Activating the primary reamer using RFID technology—thereby eliminating ball seats—enables using measurement-while-drilling (MWD) or logging-while-drilling (LWD) systems simultaneously with the reamer. MWD and LWD systems typically have restrictive IDs that do not accommodate ball-drop activation.
•Activating the secondary reamer with a pressure cycle prevents dropping an RFID tag through ID restrictions in MWD or LWD systems.
•The reamer operates with low flow rates,when necessary,toprotect sensitive formations.
•The full-bore ID permits wireline retrieval of radioactive sources,which saves rig time and associated costs.
•The reamer records downhole events such as vibration,pressure,and temperature to provide the operator with a better understanding of downhole conditions.
•Tandem tools can be run in the same bottom hole assembly(BHA)with full independent control, which improves operational efficiency.
•Cutter blocks grip the reamer body at full actuation to reduce vibration, which extends cutter life.
•The retractable cutter blocks facilitate reamer retrieval to save substantial rig time and costs.
•As wellbores have increased in complexity, conventional drilling reamers and circulation subs have declined in efficiency. These tools also increase rig costs because they require multiple trips for mechanical or hydraulic activation.
•Innovative application of active and passive radio frequency identification (RFID) technologies provides a game-changing range of options for downhole control and surface asset management. Active RFID provides new capabilities to enlarge holes, to circulate fluids for hole cleanup, and to reduce rathole length. Passive RFID provides a robust means to precisely track drillpipe for enhanced safety and efficiency.
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