MD-2 Shale Shakers Achieve Average MOC of 34% by Volume, 12.5% by Weight, Abu Dhabi | SLB
Case Study
Location
United Arab Emirates, Asia, Offshore
Details

Challenge: Recover more fluid from cuttings and ensure longer screen life while handling high flow rates on a jack-up rig offshore Abu Dhabi

Solution: Test the MD-2 dual-deck shale shaker on the following criteria: mud-on-cuttings (MOC) percent, handling capacity and solids discharge, and screen life

Results: 

  • Demonstrated an average MOC of 34% by volume
  • Handled 900 galUS/min [3,407 L/min] of fluid using two shakers while mud covered less than 50% of the total surface area
  • Required only one screen changeout during the test operation
  • An operator working offshore Abu Dhabi sought a shale shaker that would reliably deliver low MOC values, handle high volumes of flow, and longer screen life. It turned to M-I SWACO to help evaluate and deploy the optimal technology
Products Used

MD-2 Shale Shakers Achieve Average MOC of 34% by Volume, 12.5% by Weight, Abu Dhabi

Dual-deck shakers prove effective at decreasing mud on cuttings and handling high flow rates on offshore drilling operation

Optimal shale shaker performance required for offshore drilling

An operator working offshore Abu Dhabi sought a shale shaker that would reliably deliver low MOC values, handle high volumes of flow, and longer screen life. It turned to M-I SWACO to help evaluate and deploy the optimal technology.

MD-2 shaker selected based on operator objectives

M-I SWACO deployed the MD-2 dual-deck shale shaker based on the operator’s objectives. The MD-2 shaker is designed to augment the fluid process capabilities of shakers and recover extra fluid in a smaller footprint compared with conventional shakers.

Efficient shaker exceeded customer’s demands

A retort test was run for a length of 2,500 ft and a bit diameter of 12 1/4 in. MOC retort analyses were performed daily. The total solids discard rate (TSDR) measurement was completed during regular drilling to determine the maximum capacity of the MD-2 shaker. Full flow during regular drilling was diverted to the first MD-2 shaker, and the collection trough was placed under the discard end. Thirty seconds later, the trough was 75% full, and the sample was collected. The TSDR for the first MD-2 shaker was 1.47 lbm/s [0.67 kg/s].

During drilling operations, two shakers were dressed with API 140 mesh composite screens. The two shakers processed the entire flow rate of 900 galUS/min while the mud covered less than 50% of the surface area. Only one screen required changeout during the operations. At full flow, drilling continued at an ROP of 40–50 ft/h [12–15 m/h], and the two shakers maintained MOC of between 26% and 40% by volume and 9% to 16% by weight with no overspill or runoff.

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Measurements of mud remaiining on the cuttings after being processed by the MD-2 shakers. On average, the MOC was 34% by volume and 12.5% by weight.
Products Used

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