Apparatus and method for determining volume stability of well cement

A method for determining a volume change of well cement, comprising:

• acquiring a well cement sample of a target area;
• testing a radial volume change of the well cement sample under a condition of a preset temperature and a preset pressure to acquire a radial volume change parameter of the well cement by an apparatus, the apparatus comprising:
• a reaction kettle, a radial contraction and expansion ring, a heater, a pressurizer, and a volume change parameter tester, wherein:
• the radial contraction and expansion ring comprises a first casing and a second casing, the first casing is a casing made of elastic material, the second casing is a steel casing, the first casing sheathes the second casing, an upper cover and a lower cover are provided at a top and a bottom of the radial contraction and expansion ring, respectively, and an annulus between the first casing and the second casing is used for accommodate a well cement sample of a target area to be detected;
• the radial contraction and expansion ring is provided in the reaction kettle;
• the heater is connected to the reaction kettle, and is used to provide a preset temperature to the radial contraction and expansion ring;
• the pressurizer is connected to the reaction kettle, and is used to provide a preset pressure to the radial contraction and expansion ring;
• and
• the volume change parameter tester is connected to the reaction kettle, and is used to determine a radial volume change parameter of the well cement by detecting a deformation parameter of the second casing under a condition of the preset temperature and the preset pressure, the radial volume change parameter is used to determine the volume change of the well cement;
• wherein the upper cover and the lower cover are used to make an axial volume of the well cement unable to change;
• testing an axial volume change of the well cement sample under the condition of the preset temperature and the preset pressure, to acquire an axial volume change parameter of the well cement;
• and
• determining the volume change of the well cement according to the radial volume change parameter of the well cement and the axial volume change parameter of the well cement.