API RP 10B-5:2005(R2015) pdf download
API RP 10B-5:2005(R2015) pdf download.Recommended Practice on Determination of Shrinkage and
Expansion of Well Cement Formulations at Atmospheric Pressure.
4 Sampling
4.1 General
Samples of the neat cement or cement blend, solid and liquid add,tives, and mixing water are required to test a slurry according to this part of ISO 10426, Accordingly, the best available sampling technology shouki be employed to ensure the laboratory test condEt.ons and materials match as closely as possible those found at the weilsite. Some commonly used sampling devices are shown in ISO 10426-2:2003, Figure 1.
4.2 Method
Applicable sampling techniques for the fluids and materials used are specified in ISO 10426-2:2003. Clause 4.
5 Determination of shrinkage or expansion under conditions of free access of water
at atmospheric pressure — Annular ring test
5.1 General information
The annular expansion mould is a device suitable for measuring only the linear bulk shrinkage or expansion pi-operties of a cement formulation. The magnitude of expansion depends on the amount of expanding agent. cement powder, slurry design and curing condition (pressure, temperature, time, fluid access). It should be noted that expansion is strongly affected by boundary conditions. The chemical process of mineral growth is strongly controlled by the state of stress and mineral growth will tend to occur where the stress value Is the lowest. i.e. in pore space or empty spaces. Therefore, the degree of cement shrinkage and expansion is dependent on a number of conditions, not all of which can be uniquely defined. The test does not represent fully the annulus of a well.
5.2 Apparatus
5.2.1 Mould
5.2.1.1 General
Use corrosion-resistant material (e.g. stainless steel). The outer diameter (OD) of the inner ring shall be 50,8 mm (2 in) and the inner diameter (ID) of the outer expansion ring shall be 88.9 mm (3.5 in).
See Figures 1, 2 and 3.
5.2.3 Cooling bath
The cooling-bath dimensions shall be such that the specimen to be coded from the curing temperature can be
completely submerged In water maintained at 27 C * 3 C (80 F 5 F).
5.2.4 Temperature measuring system
The temperature-measuring system shall be calibrated to an accuracy of i 1 C (±2 CF). 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 divisions 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 atmospherlc-p.’essure 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 5hall 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 r!s ± 0.25 r/s (150 rpm ± 15 rpm) 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 inlerior faces of the moulds and contact surfaces of the plates may be left dean 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 nng 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.
I) 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 flng: 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.
