Shaker screen life is usually considered as an important issue. Then how long should a high quality shaker screen last during operation? Is there any standard or tips? How can we get screen lasted longer? Please find following information for your reference.
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How long is usable life of shaker screens in common well drilling?
Screen usable life is a really comprehensive question but often asked by clients. There are so many different issues affect its life. Including screen itself quality, operator professional level, mud condition or working condition, shaker condition, handling way, cleaning and maintenance on screen, storage condition, and so on. These are factors from buyer or user.
As per present information we get the screen life of different models or brands is from 20 hours to 22 days. This data including many different pattern of screen, different API size screen, different working condition. How should we consider this ask reasonably? Make records and test regularly during well drilling. Such as drilling condition, mud property, filtration result, screen life, and so on. Compare screens last differently under same condition then find out the better screen. If we select screens improperly even they last over 30 days that makes no sense. We have some feedback from our users under a certain condition with their satisfaction. Please check below feedback:
Hole size 12 1/4” while depth to ft
Mud weight: 10.9lbs
Formation: shale/sand
Hours run: about 160 hours
Screen failure: due to normal wear to top layer
Result: Satisfactory on screen life
Hole size: 8 1/2” while depth to m
Mud density: 1.08Sg
Mud system: WSM&Gel Sweep
Duration: Aug.18- Aug.20
Shaker degree: +3°
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Result: Excellent solids throughput, conveyance was excellent, minimum fluid loss, no wear over served on screens after TD section achieved
There are also oral feedback from many other users, but without sufficient reference information. Please find our suggestions or recommendation on enhancing screen life during oil drilling:
Depending on screen types. For example, if the screen is frame type without rubber strip backside nor rubber sealing on sides, we can store it on shelf for 2-3 years. But the storage condition is away from extreme weather and moisture. Why? We know screen panels including frame and S.S screen cloth. The frame is a steel frame (coated) or composite frame. There are elements that will age and this affects screen life & performance. For screens fit with rubber strip or sealing rubber, the suggested shelf life is no longer than 12 months. As we know, the rubber material is easy to age even under common storage condition. For all screens, when we keep them in a warehouse please consider below suggestions
How do we repair it? Why do we repair it? We use plugs to cover the broken area on screen panel. Usually, the plug is slightly larger than the hole of grids or damage area to make it tightly to the hole side. We repair screens consider 3 main reasons. One, repairing avoids further larger damage, two, repairing avoids mud loss, the other is repairing helps save cost to replace the screen with little worn. In some degree, repair screens enlong the shaker screen life.
We can’t repair all of screens. Presently, at Aipu Solids Control we provide repair plugs for flat screens made by us and for some typical famous brand shaker screen. Such as Cobra series screen, PWP48x30, PWP500, Mongoose series and so on. Furthermore, if we have made screens for you, they can be repaired with plugs produced by us, no matter it is a famous brand or not. To check if your screens are repairable please tell us the shape of a punched panel on the frame. Including shape, sides, the thickness of the sheet. Moreover, we need to confirm is it necessary to repair a screen panel. According to the worn area, or broken ratio. We suggest repairing the screen broken area is no more than 25%.
Pyramid screens operation is important for users. We should treat pyramid screens performance or failure objectively. While it is true that “Pyramid Screens” channel solids and do wear more rapidly on the bottom of the valleys, this can be largely offset by setting up the shaker to account for this bias. One of the main design reasons for the corrugated configuration is to allow drilling fluid to pass through the screen more quickly than on flat screens
Pyramid screen panels also referred to corrugated shaker screens. It is an innovated design of Derrick Corporation. Many shaker screen panels can be fabricated as pyramid type. Many clients prefer pyramid screens but some don’t. Please find more information and find out why they have different preference?
The first thing to remember is that the corrugated screen has more square footage than a flat screen of the same width. Where the flat screens may be completely covered in cuttings, thus creating a solids barrier between the fluid and the screen mesh, the configuration of the pyramid shaker screen is such that the solids collect in the valleys, allowing much faster throughput of the fluid through the ridges of the screen, where there is no solids barrier. This in turn, translates to a reduced residence time on pyramid screens to achieve the same performance as a flat screen.
A lower deck angle is most important for preventing accelerated wear on corrugated screens. Many people use the same deck angle for pyramids as flat screens. This is incorrect. As a matter of fact it can be detrimental to performance. Under most circumstances, the rule of thumb of 75% fluid coverage on the shaker bed can be achieved with all corrugated screens at a lesser shaker angle than with flats. This means that the solids move down the screen faster, reducing the potential for wear
Also, it has been demonstrated that pyramid screens perform better and last longer on higher G shakers and shakers with elliptical motion. With proper deck angle, both of these conditions promote faster solids transfer down the screen and help minimize wear. As with anything, there are exceptions to this. Extreme solids overloading (more solids on the screens than they were designed to handle), as in high ROPs on big hole sections, can cause extremely fast wear on any screen. Fluid makeup and bit type can also influence screen wear
So many years, we got a lot of appreciation on our shaker screen both PMD and flat type. Honestly speaking, we do also get the complaints and dissatisfaction from users. How should we avoid the failures and overcome them? How should we treat such problems?
One major consideration in screen wear is screen mesh. Higher number screen meshes translate into ever smaller openings in the screen. In order to achieve these smaller openings, either one or both of the directional top wires (horizontal or vertical) must get smaller in diameter. Because of this, the finer the mesh the more rapid the wear, even under optimum conditions. Add the dynamics of improper mesh selection, high ROP, incorrect deck angle or a host of other variables and screen wear can be unbelievably rapid
Kindly keep the operation tips in mind and inquire us for legal proper operation on pyramid shaker screens. Actually, at some occasion where running a combination of flat and corrugated screens may yield very satisfactory results. We suggest the corrugated on the feed end and flats on the drop. Usually two and two. My reason is that, on lower G shakers, corrugated all the way to the end usually carry more fluid off with the cuttings and substituting the flats allows the cuttings to “spread out” and give up more fluid than if they remain in the bottoms of the channel
Please feel free to contact us if any question. We are happy to answer you rapidly
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