Apparatus and method for determining volume stability of well cement

Patent metadata

Field	Value
Publication number	US-11112398-B2
Application number	US-201816207055-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Apr 2, 2018
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

An apparatus and method for determining a volume stability of well cement including a reaction kettle, a radial contraction, an expansion ring, a heater, a pressurizer, and a volume change parameter tester. The radial contraction and expansion ring include a first casing and a second casing, the first casing is a casing made of elastic material, the second casing is a steel casing, and the first casing sheathes the second casing. The heater and the pressurizer are used to provide a preset temperature and a preset pressure respectively and the volume change parameter tester is used to detect a radial volume change parameter of the well cement. The apparatus is provided with the radial contraction and expansion ring to acquire the radial volume change parameter of the well cement, and comprehensively evaluates the volume stability of the well cement using the radial volume change parameter of the well cement.

First claim

What is claimed is:

1. An apparatus for determining a volume change of well cement, 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.

2. The apparatus according to claim 1 , wherein a rubber seal is achieved between the radial contraction and expansion ring and the upper cover, and a rubber seal is achieved between the radial contraction and expansion ring and the lower cover.

3. The apparatus according to claim 1 , wherein an injection hole and a discharge hole are provided on the upper cover, the injection hole is communicated with the annulus between the first casing and the second casing, and the discharge hole is communicated with the annulus between the first casing and the second casing.

4. The apparatus according to claim 1 , wherein a pressure adjusting hole is provided on the upper cover and the lower cover, respectively, and is communicated with an interior of the second casing.

5. The apparatus according to claim 1 , wherein a fixing hole is provided at a center position of the lower cover, and is used to fix the radial contraction and expansion ring in the reaction kettle.

6. The apparatus according to claim 1 , further comprising a processor connected to the volume change parameter tester and used to determine the volume change of the well cement according to the radial volume change parameter of the well cement and an axial volume change parameter of the well cement, the axial volume change parameter of the well cement represents an axial volume change rate of the well cement.

7. 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.

8. The method according to claim 7 , wherein the preset temperature is determined according to a downhole temperature of the target area, and the preset pressure is determined according to a downhole pressure of the target area.

9. The method according to claim 7 , wherein 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 comprises:
comparing the radial volume change parameter of the well cement with a radial volume change threshold, and comparing the axial volume change parameter of the well cement with an axial volume change threshold; and
when the radial volume change parameter of the well cement is smaller than the radial volume change threshold and the axial volume change parameter of the well cement is smaller than the axial volume change threshold, determining that the volume change of the well cement is satisfactory.

10. The method according to claim 7 , wherein the well cement sample comprises cements of a plurality of ratios for constructing a cement ring between a downhole formation and a downhole casing in the target area.

Assignees

• Petrochina Co Ltd

Inventors

• Wang Fuyun
• Zheng Youzhi
• Li Jie
• Ma Huiyun
• Jiao Libin
• Yang Tao
• Yu Jiang
• Tan Qiyan

Classifications

• G01N33/383 Primary

  Concrete or cement · CPC title

• E21B47/005

  Monitoring or checking of cementation quality or level · CPC title

• G01N3/18

  Performing tests at high or low temperatures · CPC title

• G01N3/12

  Pressure testing · CPC title

• E21B33/13 Primary

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title