NOV introduces shaker system with 90-second screen replacement time
National Oilwell Varco (NOV) recently launched SABRE, a modular shaker system based on a scalable platform that can be easily changed from a single deck to a double deck and from a double deck to a triple deck shaker.
The upgrade can be done in the field, without the need to change out the complete shaker system, according to Richard Manning, Product Manager of Equipment for NOV.
Further, by reducing the weight of the shaker’s screens to 14 lb, NOV was able to get screen replacement time down to about 90 seconds, Mr Manning said at the 2018 IADC Advanced Rig Technology Conference on 11 September in Austin, Texas.
The BRANDT? SABRE? shaker system represents an industry revolution. The first of its kind, SABRE is a modular shaker system based upon a scalable platform that can easily be changed from a single deck to a double deck and from a double deck to a triple deck shaker. This simple upgrade can be made in the field, eliminating the need to change out the complete shaker system and allowing SABRE to be easily adapted to customer-specific needs.
Field tests have shown that the SABRE shake has 1.5 to 2 times the fluids-handling capacity of existing high-performance shakers. This performance advantage enables SABRE to better control low-gravity solids (LGS) throughout the entire drilling process, thereby reducing dilution and associated logistics costs.
This is due in part to SABRE’s robust and differentiated design. With the drive assemblies mounted directly over the sidewalls of the basket, energy is more effectively transferred to the screens. SABRE’s G-force is set at 7 G, with the counterweights adjustable to compensate for increasing the number of decks. These design features make SABRE a more potent primary screening system than any other in the industry.
The SABRE shaker has also proven to deliver dryer cuttings compared to other high-performance shakers. In the latest field runs, SABRE consistently reduced oil retention on cuttings from around 11% to below 9%, decreasing both haul-off and disposal costs.
For operators whose drilling application requires the retention and recovery of costly lost-circulation or wellbore-stabilization materials, SABRE’s triple-deck configuration can be setup to retain these particles and reintroduce them into the fluid system while still removing unwanted LGS.
Besides increased performance, ease of use and durability were principal factors in the design of the SABRE shaker. SABRE screens are super-lightweight (weighing in at only 14 lb) and are repairable using NOV’s unique AX SNAPFAST? screen repair system. In addition, the screens are secured and sealed using NOV’s industry-proven pneumoseal technology, allowing screens to be quickly changed out by a single operator in a matter of minutes.
For drilling rigs equipped with KING COBRA VENOM? or HYBRID shakers, SABRE can be retrofitted into the existing skids, further reducing upfront costs and installation time.
This preliminary field trial was to confirm initial R&D results of the SABRE shaker system, and to get performance data in real drilling conditions. The rig that the test would be run currently had BRANDT KING COBRA Hybrid (KCH) shakers. We document all aspects of the SABRE shaker system, from install to operation. This began with the retrofit installation of a single SABRE shaker into an existing KING COBRA Hybrid skid.
The SABRE shaker can be installed into existing KING COBRA shaker skids, this provides the customer operator and contractor with the flexibility of implementing SABRE shakers into their operations with minimal downtime, minimal cost and allows for the use of the exiting flow distribution system. In this case we were able to install the SABRE shaker into the existing skid of a KING COBRA in less than 8 hours. That time could be further reduced on subsequent shakers and this demonstrated that a complete retro-fit installation could be achieved in a 24hr period or rig move.
Where the SABRE excelled was in its overall performance, the SABRE generally handled 70-100 % of the total flow (±600GPM) throughout the five well program with API 200 screens fitted. On this test, screens ranged from API 140 thru API 230 during the 8?” OBM sections, and the rate-ofpenetration (ROP) averaged 60-110ft/hr.
The SABRE unit consistently discharged much dryer cuttings compared to the existing KCH shakers with retention of oil on cuttings (ROC) averaging 8.85% compared with 11.2%, while consistently maintaining LGS (low-gravity solids) levels below 11.8% with only 1 SABRE shaker. There was also no requirement to run any other solids control equipment including a centrifuge and no increase in additional dilution which is typically seen on these types of wells. The reduction in ROC means that the haul off and treatment costs were also reduced.
In addition to the improved shaker performance, the SABRE shaker yielded lower overall screen usage and cost compared to the KING COBRA Hybrid. For the majority of the 5-well trial, only two shakers were deployed – thereby reducing overall screen usage and improving overall operability as screen inspections/changes could be made easily since one shaker was generally offline. Throughout the 5 well program only 91 screens were used in total which consisted of 24 SABRE screens and 67 KCH screens. This was significantly less than seen on the 5 previous comparable wells with the same rig where a total of 250 screens were billed.
The client representatives involved in this field test from the company-man, mud engineers, toolpusher & rig crew all voiced their approval of the SABRE shaker system and its improved performance over the existing shaker system. It’s safe to assume that with a complete SABRE shaker system these savings and overall benefits would have been far greater.
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