Shale shaker decides the performance of the whole solids control system, it is the first phase solids control equipment in the drilling mud processing system. We AIPU have enhanced the “typical” shaker with better and more efficient screens, more powerful and lighter motors resulting in higher G forces to better clean drilling mud.
Shale shaker uses a back tank (commonly known as mud box) to receive drilling fluid from the flowline. Drilling fluid flows over a weir and is evenly distributed to the screening surface, or deck. The screens are mounted in a basket that vibrates to assist the throughput of drilling fluid and the movement of separated solids. The basket rests on vibration isolator members, such as helical springs or rubber mounts. The vibration isolation members are supported by the skid. Below the basket, a collection pan (or bed) is used to channel the underflow to the active system.
Shale shaker performance is affected by (1) vibratory motion, (2) amplitude and frequency, (3) deck slope and number of decks of screens, and (4) screening area.
Vibratory Motion – There are three types of shale shaker screening motion: circular, unbalanced elliptical and linear (see Figure 11). Each is differentiated by the positioning of the vibrators with respect to the center of gravity of the deck. at AIPU Solids Control, linear motion shaker is most populur for particle separation in the oil and gas drilling mud circulation and waste slurry separation industry.
Amplitude and Frequency – The throughput capacity of shakers depends on three parameters: amplitude and stroke, vibratory motion, and vibrator speed. Amplitude is defined as the maximum screen displacement perpendicular to the position of the screen. Stroke is defined as being twice the amplitude. Vibratory motion, defined previously, is either circular, unbalanced elliptical, or linear. The vibratory speed is the speed at which the vibrator moves. A higher g factor gives better solids separation; however, it will also reduce screen life. so proper g force is better, the user could adjust it by themselves through vibrating motor.
Slope and Number of Screen Decks – A screen deck is vibrated to assist the throughput of mud and movement of separated solids. Shale shakers that use an elliptical motion usually have divided decks with screens placed at different slopes in order to provide a proper discharge of cuttings. Sloped-deck units can have one screen covering the entire deck length, or have a divided deck which has more than one screen used to cover the screening surface, or with individual screens mounted at different slopes. Multiple-deck units have more than one screen layer. In a 2 or 3-deck unit, mud must pass through one screen before flowing through the second, etc.
Screening Area – Shale shaker screening is the primary means of solids separation. If the shale shaker is not working correctly or if the screens are incorrectly sized, efficiency is drastically reduced.
- Screens are available in square, rectangular and layered design. AIPU screens are manufacturered per API standard. Screens are labelled with separation potential, conductance and area.
- Weave of wire cloth and mesh count are two interesting design variables. The square and rectangular weaves are the types most often used.
Please call or write us if you have questions concerning drilling mud shale shakers.