Solids Control Equipment - Shale Shakers

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The importance of shale shakers as the primary solids control equipment capable of handling the full returns from the wellbore cannot be over stressed. They must be operated as efficiently as possible, at all times, in order to maximise the amount of solids removed at the first pass.

Solids passing through the shakers will be re-circulated, during which they will be reduced in size. Wear and tear on pumps and tubulars will be the result and the reground cuttings will be even more difficult to remove on their next pass. If the solids are reactive they will require costly chemical treatment and/or whole mud dilution.

Operational Guidelines

  • Shakers shall be switched on immediately before running in the hole to cope with mud displaced by the drill string and BHA.
  • Coarse mesh top screens shall be used on double deck shakers, to remove the bulk of the large cuttings and thus enable finer screens on the lower deck to function more efficiently.
  • Initially, shakers should be fitted with relatively coarse screens, such as 80 mesh, for running in the hole and breaking circulation.
  • With new water based polymer mud, or with cold oil based mud after trips, screen blinding may occur during the initial period of circulation. After 1 or 2 circulations, the screens may be changed to finer mesh as the polymer shears, or the mud heats up.
  • Flow shall be distributed evenly over all available shakers.
  • The finest mesh screens shall be selected, taking into consideration maximum solids separation whilst ensuring that whole mud is not lost and screens are not overloaded.
  • Screens should be changed to a finer mesh and square mesh screens should be changed out to equivalent rectangular mesh screens in attempts to alleviate problems of sand blinding.
  • A reduction in circulation rate and/or changing to coarser screens should alleviate screen blinding problems resulting from high viscosity mud. However, circulation rate must only be reduced if it is absolutely certain that effective hole cleaning can be maintained.
  • Screens shall be inspected regularly and changed out immediately when found as defective. Operations must not be allowed to continue with a torn or ineffective screen.
  • Shaker screens shall be washed down regularly with water eg., on connections, for ease of inspection, to maintain screening efficiency and to prolong screen life.
  • Shaker screens shall be washed down prior to tripping out of the hole and before shakers are switched off. Cuttings must never be allowed to dry hard upon the screens.
  • During milling operations a ditch magnet is placed in the flow ditch.
  • Shakers shall be switched off immediately prior to tripping out of the hole. Care must be taken to ensure that the shakers are started before breaking circulation for any reason, e.g. backreaming and pumping out.
  • The shakers shall never be run dry as this will lead to increased wear and premature screen failure.
  • The shakers shall never be by-passed, except if absolutely necessary, in the case of running LCM in the mud.
  • Adequate stocks of screens, in a variety of useful sizes, shall be maintained on location at all times.

Screen Selection

The performance characteristics of commonly used screens are shown in the following table:

SCREEN TYPE / MESH

OPENING SIZE (MICRONS)

OPENING

SIZE

(INCHES)

OPENING AREA

(%)

BRANDT

DERRICK

SQUARE

 

 

 

 

 

8x8

2464

0.0970

60.2

S8

 

10x10

1950

0.0750

56.3

S10

 

12x12

1524

0.0600

51.8

S12

 

14x14

1295

0.0510

51.0

S14

 

16x16

1130

0.445

50.7

S16

 

18x18

955

0.0376

45.8

S18

 

20x20

838

0.0330

43.6

S20

-

30x30

541

0.0213

40.8

S30

DX24

40x40

381

0.0150

36.0

S40

DX38

50x50

279

0.0110

30.3

S50

DX50

60x60

234

0.0092

30.5

S60

DX70

80x80

178

0.0070

31.4

S80

DX84

100x100

140

0.0055

30.3

S100

DX110

120x120

117

0.0046

30.9

S120

DX140

150x150

105

0.0041

37.4

 

 

200x200

74

0.0029

33.6

 

 

250x250

63

0.0025

36.0

 

 

325x325

44

0.0017

30.0

 

 

8x20

2362x762

0.0929x0.0300

45.7

B20

R25

20x30

898x465

0.0350x0.0183

39.1

B40

R30

20x40

910x310

0.0358x0.0122

36.8

B60

R40

20x60

940x195

0.0370x0.0077

34.0

B80

 

40x50

419x292

0.0165x.0115

38.3

 

 

24x60

830x200

0.0327x0.0079

41.5

 

 

30x70

660x178

0.0260x0.0070

40.3

 

 

40x60

406x195

0.0160x0.0077

29.4

B100

R600

40x80

460x140

0.0181x0.0055

35.6

B120

R80

The following screen selection are for guidance only. Final screen sizes to be selected based on flow rate, number of shakers and drilling conditions.

Hole Size

Suggested Screen Size (Mesh)

17 ½

80-100

12 ¼

120-150

8 ½

150-200

 

Comments  

#1 Sofie Lie 2016-12-05 08:51
Please kindly send your best rate for below item. Thanks

1. Shaker Super Screen Mesh B120 (40x80) | 2 Ea
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