API RP 10B-5:2005(R2015) pdf download

API RP 10B-5:2005(R2015) pdf download.Recommended Practice on Determination of Shrinkage andExpansion of Well Cement Formulations at Atmospheric Pressure.
5.2.3 Cooling bath
The cooling-bath dimensions shall be such that the specimen to be cooled from the curing temperature can be
completely submerged in water maintained at 27 °C ± 3 C (80 F ±5 CF).
5.2.4 Temperature measuring system
The temperature-measuring system shall be calibrated to an accuracy of ± 1 C (± 2 °F). Calibration shall be no less frequent than monthly. The procedure described In ISO 10426-2:2003. Annex A, is commonly used.
5.2.4.1 Thermometer
A thermometer with a range including 21 C to 100 C (70 F to 212 F) with minimum scale dMsions not
exceeding 1 C (2 F) should be used.
5.2.4.2 Thermocouple
A thermocouple system with the appropriate range should be used.
5.2.5 Consistometer
The atmospheric-pressure consistometer shall be used for stirring and conditioning the cement slurry. The consistometer consists of a rotating cylindrical slurry container, equipped with an essentially stationary paddle assembly, in a temperature-controlled liquid bath. The consistometer shall be capable of maintaining the temperature of the bath within 2 C (± 3 F) of the test temperature and of rotating the slurry container at a speed of 2.5 ris ± 0,25 rls (150 rpm ± 15rpm) during the stirring and conditioning period for the slurry. The paddle and all parts of the slurry container exposed to the slurry shall be constructed of corrosion-resistant materials (see ISO 10426-1:2000).
5.3 Procedure
5.3.1 Preparation of the mould
The assembled moulds shall be watertight to avoid leakage. The interior faces of the moulds and contact surfaces of the plates may be lightly coated with a release agent. Alternatively, the interior faces of the moulds and contact surfaces of the plates may be left clean and dry. In the case of a shrinkage test, place the spacer block inside the split of the outer ring. Prepare the mould as follows.
a) Clean the mould thoroughly.
b) Place a bead of grease on the upper and lower plates where the inner stationary ring and the outer expandable ring touch.
C) If desired, apply a very thin film of light mineral oil to the inner and outer rings and to the surface of the top and bottom covers that will contact the cement.
d) With the top cover inverted, place the inner and outer rings on the top cover.
e) Place the bottom cover over the inner and outer rings.
f) Insert the bolt into the centre hole and tighten the bolt to hold the mould together.
g) Verify that the expandable outer ring rotates freely and place the big hole adjacent to the split (Figure 9).
h) Place a small amount of high-temperature grease between the split in the outer ring: the grease will seal the split and prevent the slurry from leaking before it sets.
i) To test for shrinkage, coat a spacer block with grease and place the block with the small side between the split in the outer expandable ring: see Figures 5 and 6.
5.3.2 Preparation of slurry
5.3.2.1 Mixing
Test samples shall be prepared in accordance with ISO 10426-2:2003, Clause 5. The mixing device shall be calibrated annually to a tolerance of ± 3,3 rls (200 rlmin) at 66,7 rls (4 000 rfmin) and ± 8,3 rls (500 rtmin) at 200 rls (12 000 rlmin). In addition to accurately controlling the mixing speed, the wear of the mixing blade should be monitored. As such, when the mixer blade has lost more than 10 % of its onginal mass, it shall be replaced.
If larger slurry volumes are needed, an alternate method for slurry preparation is found in ISO 10426-2:2003.
Annex A. As required, the density of the cement slurry can be determined by methods found In
ISO 10426-2:2003. Clause 6.
5.3.2.2 Slurry conditioning
After mixing, the cement slurry should be poured immediately into the slurry cup of an atmospheric consistometer for conditioning. The slurry cup should be initially at ambient temperature to avoid the possibility of thermally shocking temperature-sensitive slurries. The slurry shall be then heated to the desired test temperature of up to 88 C (190 ‘F). The thickening time schedule that most closely simulates actual field conditions shall be followed; see ISO 10426-2:2003.
5.3.3 Curing at atmospheric pressure
The slurry. after it is heated at the desired test temperature, shall be re-stirred with a spatula to ensure uniformity. The slurry is poured into the large fill hole at the outer portion of the top of the ring mould (preheated to the test temperature in an oven). The small hole in the top of the mould Is for venting air from the mould during filling. The mould is filled until the slurry exits the small hole. On some thicker slurries, the mould might need to be tapped or vibrated to ensure it is completely filled. If the slurry is too thick to pour freely, use a modified syringe to transfer the slurry into the mould through the large hole In the top of the ring mould. To make the modified syringe, cut off the tip of a 60 ml syringe and widen the opening to approximately 6.5 mm to 9,5 mm (114 in to 318 in). With the plunger inside the syringe, place the syringe into the thick slurry, slowly pull the plunger Out to suck the slurry inside the syringe, and then eject It into the large hole of the mould. Repeat this process until the mould is filled completely.
Once the slurry is poured, the mould is placed into a water bath that has been preheated to the test temperature. The slurry Is in contact with water during the entire test. After cunng. the sample is cooled to below 77 C (170 F).
Water entry will compensate for any inner shrinkage as long as the cement matrix is permeable. If the cement expands during the hydration period the outside diameter of ring will expand.