Cementing

by Iran Request
2 years قبل
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General description of minerl bitumen in cementing

By mineral bitumen doing primary cementing through lost-circulation zones of surface, intermediate, and production pipe in both single and multiple stages as well as various remedial jobs such as squeezing, le-cementing above inadequate fill-up, and plugging back to re-establish drilling-fluid circulation. Designed primarily as a combination low-density, lost-circulation slurry, mineral bitumen has yielded excellent results In areas of incompetent formations as well as in other types of lost-circulation zones Field results generally show that fill-up of 80 to 90 percent can be obtained in areas where only 50 to 60 percent fill-up was possible with other types of slurries. The unique properties of mineral bitumen such as low specific gravity, particle-size distribution, impermeability, resistance to corrosive fluids, chemical inertness, and low water requirements result in a slurry having exceptional bridging properties, low slurry weight, compatibility with other slurry additives, and relatively high compressive strength when compared to other slurries of the same weight.

Select of mineral bitumen use in cementing

As the oil-producing industry has continued to grow, the need for a low-density cementing slurry possessing lost-circulation control characteristics has become more and more evident. This is especially so In primary cementing because of the different types of formations being encountered and the need to reduce remedial cementing operation These problem formations may range from either porous or cavernous formations to very weak formations that are unable to support the hydrostatic head that is necessary for drilling and well completion. This latter type of formation will often break down or fracture under hydrostatic loading, resulting In partial or complete loss of circulation.

Lost-circulation zones encountered during drilling operation may produce many problems In the normal course of completing a well. Increased expenditures can result from reduced drilling finishing jobs, and other mechanical difficulties as well as from loss of large volumes of drilling fluid . Sometimes severe lost-circulation problems may even cause abandonment of a well. Lost circulation during cementing operations will often be reflected by inadequate fill-up In the annulus and the consequent displacement of slurry into formations away from the well bore. Satisfactory isolation of the different formations may then require re-cementing work above the point of loss and subsequent squeeze-cementing jobs.

 

Cementing with mineral bitumen

Unit Design 1 Design 2 Design 3 Design 4 Design 5
Slurry (kg/m3) 1606 1737 1737 1606 1606
Density
Solid (%) 50  53 53 50  50
Volume
Fraction
(SVF)
mineral bitumen (kg/m3) 110 124 124 112 113
SIS Particle (kg/m3) 107  113* 114 102 102
Cement (kg/m3) 689 773 772 686 690
Silica (kg/m3) 199  0 0 201 203
Weighting (kg/m3) 0 254 254 0  0
agent
Water (kg/m3) 490 457 457 494 491
Antifoam (kg/m3) 4.7    5.3 5.3 3    3.1
Agent
Dispersant (kg/m3) 2.3    6.5 6.5 3    3.0
Antisettling (kg/m3) 2.2    3.8 3.8 4     0.4**

Packing of mineral bitumen natural asphalt lump and powder form micronized

mineral bitumen in lump form like rock packed in 500~1000kg jumbo bag

200 mesh packed in 500~1000kg jumbo bag

300 mesh packed in 500~1000kg jumbo bag

mineral bitumen 30-40 mesh packed in 500~1000kg jumbo bag

100 mesh packed in 500~1000kg jumbo bag

300 mesh packed in 25kg pp bag

200 mesh packed 25kg multi paper bag

200 mesh packed 50lbs multi paper bag

mineral bitumen 30-40 mesh packed pp bag on pallet

Bulk on vessel

Specification of mineral bitumen

TEST METHOD

RESULT

TEST

NO

ASTM-D3174

5

ASH CONTENT,WT%

1

ASTM-D3173

1%

MOISTURE CONTENT,WT%

2

ASTM-D3175

63

VOLATILE MATTER,WT%

3

ASTM-D4

81

SOLUBILITY IS CS2,WT%

5

ASTM-D3289

1.11

SPECIFIC GRAVITY @25 C

6

ASTM-D3279

79

NORMAL HEPTHAN INSOLUBLES,WT%

7

——————-

Black

COLOR IS MASS

8

——————-

Black

COLOR IN STREAK OR POWDER

9

ASTM-D36

205

SOFTENING POINT,C

10

ASTM-D5

0

PENETRATION @25C

11

ELEMENT ANALYSIS

ASTM-D5291

84

CARBON,WT%

1

ASTM-D5291

7.1

HYDROGEN,WT%

2

ASTM-D5291

3.67

NITROGEN,WT%

3

ASTM-D5291

3.1

OXYGEN,WT%

4

LECO(S)ANALYZER

4

SULPHURE,WT%

5

 

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