ANSI API RP 10B-5:2005 (2020) pdf download.Recommended Practice on Determination of Shrinkage and Expansion of Well Cement Formulations at Atmospheric Pressure.
This part of ISO 10426 provides the methods for the testing of well cement formulations to determine the dimension changes during the curing process (cement hydration) at atmospheric pressure only. This is a base document, because under real well cementing conditions shrinkage and expansion take place under pressure and different boundary conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 10426-2:2003, Petroleum and natural gas industries — Cements and materials for well cementing — Part 2: Testing of well cements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bulk expansion
increase in the external volume or dimensions of a cement sample
3.2
bulk shrinkage
decrease in the external volume or dimensions of a cement sample
3.3
hydration shrinkage
difference in the volume between the hydration products and the volume of the dry cement, additives and water
4 Sampling
4.1 General
Samples of the neat cement or cement blend, solid and liquid additives, and mixing water are required to test a slurry according to this part of ISO 10426. Accordingly, the best available sampling technology should be employed to ensure the laboratory test conditions and materials match as closely as possible those found at the wellsite. 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 properties 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 (CD) 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.ANSI API RP 10B-5 pdf download.