CN214374431U - Volume expansion and contraction tester for oil well cement under high-temperature and high-pressure conditions - Google Patents
Volume expansion and contraction tester for oil well cement under high-temperature and high-pressure conditions Download PDFInfo
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- CN214374431U CN214374431U CN202120471237.3U CN202120471237U CN214374431U CN 214374431 U CN214374431 U CN 214374431U CN 202120471237 U CN202120471237 U CN 202120471237U CN 214374431 U CN214374431 U CN 214374431U
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Abstract
The utility model provides a volume expansion and contraction tester under the high temperature and high pressure condition of oil well cement, which comprises a testing kettle, a kettle body, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are respectively arranged at the upper part and the lower part of the kettle body; the measuring system comprises a high-temperature pressure gauge arranged on the testing kettle, a first temperature sensor used for testing the temperature in the cement paste cup and a second temperature sensor used for testing the temperature of the upper space of the cement paste cup; the pressurizing system comprises an air source and a pressurizing pump which are connected, and the outlet of the pressurizing pump is connected with a pressurizing connector through a pressurizing pipe. The device can better test the shrinkage/expansion rate of the set cement under the conditions of high temperature and high pressure; meanwhile, the measurement error can be greatly reduced by specifying the size of the curing chamber volume and the size of the cement cup volume under the condition of considering the error of the measuring instrument.
Description
Technical Field
The utility model belongs to the technical field of the well cementation cement, concretely relates to volume expansion shrinkage tester under oil well cement high temperature high pressure condition.
Background
The well cementation refers to a process of putting a casing in a well and injecting cement slurry into an annular space between a well wall and the casing, and an oil layer, a gas layer and a water layer can be sealed and isolated through well cementation operation, so that oil, gas and water in the stratum cannot flee each other. However, in the actual production process, the cement shrinks during the curing process (the cement added with the expanding agent expands), so that gaps are generated between the annular spaces, and the sealing effect of cement stones is weakened. With the gradual exploitation of thick oil and ultrasonic layer oil layers, cement paste is gradually challenged by high temperature and high pressure. But at present, no equipment capable of well measuring the expansion and shrinkage rate of the set cement under the conditions of early high temperature and high pressure exists.
SUMMERY OF THE UTILITY MODEL
For solving the aforementioned problem, the utility model provides an oil well cement volume expansion shrinkage tester under high temperature and high pressure condition can realize the maintenance of set cement under high temperature and high pressure condition, makes simultaneously that the cauldron external portion that can discharge rapidly from the high-temperature gas after the experiment can not cause the influence to experimental environment.
The technical scheme of the utility model as follows: a volume expansion and contraction tester for oil well cement under high temperature and high pressure conditions comprises
The testing kettle comprises a kettle body, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are respectively arranged at the upper part and the lower part of the kettle body, a space between the upper end cover and the lower end cover is a curing chamber, a cement cup is arranged in the kettle body, cement slurry is arranged in the cement cup, the volume of the cement slurry is at least one half of the volume of the curing chamber, a heating coil is arranged on the inner wall of the kettle body, and a pressurizing connector and a pressure relief pipe are arranged on the side wall of the kettle body;
the measuring system comprises a high-temperature pressure gauge arranged on the testing kettle, a first temperature sensor used for testing the temperature of cement slurry and a second temperature sensor used for testing the temperature of the upper space of the cement slurry cup;
the pressurization system comprises an air source and a booster pump which are connected, and the outlet of the booster pump is connected with the pressurization joint through a pressurization pipe.
The utility model discloses an embodiment lies in, be provided with the scale on the cement thick liquid cup.
One embodiment of the present invention is that the inner diameter of the pressurizing pipe is one half to one fifth of the inner diameter of the pressurizing joint.
An embodiment of the present invention is that the volume of the cement cup is at least three-fourths of the volume of the curing chamber.
An embodiment of the present invention is that the gas source is an inert gas.
The utility model has the advantages that:
the device can better test the shrinkage/expansion rate of the set cement under the conditions of high temperature and high pressure; meanwhile, by specifying the volume of the curing room and the volume of the cement cup, the measurement error can be greatly reduced under the condition of considering the error of a measuring instrument, particularly a pressure gauge; meanwhile, the device is simple in structure and easy to operate.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the side wall of the kettle body of the present invention;
in the figure, 1 is a kettle body, 2 is a lower end cover, 3 is an upper end cover, 4 is a cement paste cup, 5 is a curing chamber, 6 is a first temperature sensor, 7 is a second temperature sensor, 8 is a high-temperature pressure gauge, 9 is a pressurizing joint, 10 is a pressurizing pump, 11 is a coil joint, 12 is a scale, 13 is a pressure relief pipe, 14 is a heating coil, 15 is an air source, 16 is a pressurizing pipe, and 17 is cement paste.
Detailed Description
In order to make the technical solutions and technical advantages of the present invention clearer, the following will combine the embodiments and the accompanying drawings to clearly and completely describe the technical solutions in the implementation process of the present invention.
A volume expansion and contraction tester for oil well cement under high temperature and high pressure conditions comprises
A test kettle, as shown in fig. 1-2, the test kettle comprises a kettle body 1, an upper end cover 3 and a lower end cover 2, the upper end cover 3 and the lower end cover 2 are respectively arranged at the upper part and the lower part of the kettle body 1, the space between the upper end cover 3 and the lower end cover 2 is a curing chamber 5, a cement slurry cup 4 is arranged in the kettle body 1, the cement slurry cup 4 is provided with cement slurry 17, the volume of the cement slurry 17 is at least one half of the volume of the curing chamber 5, a heating coil 14 is arranged on the inner wall of the kettle body 1, and a pressurizing connector 9 and a pressure relief pipe 13 are arranged on the side wall of the kettle body 1;
specifically, the test kettle mainly has the function of forming cement slurry 17 under the conditions of high temperature and high pressure, and is divided into a kettle body 1, an upper end cover 3 and a lower end cover 2, so that the test kettle is mainly convenient to disassemble and assemble; upper end cover 3, lower extreme lid 2 and the 1 inner wall of cauldron body have enclosed a curing chamber 5, be provided with a grout cup 4 in curing chamber 5, grout cup 4 is used for holding grout 17, grout cup 4 can be followed the test kettle and taken out simultaneously, the splendid attire grout 17 of being convenient for and the cement mortar that will maintain and form further carry out further test, in some embodiments, can also set up one deck cement mortar bag in grout cup 4, cement mortar bag main function is to separate grout 17 and grout cup 4, avoid being difficult for taking out after the cement mortar shaping.
In order to measure the shrinkage rate of the set cement, the content of the cement paste 17 needs to be known firstly, so that the scale 12 is arranged on the cement paste cup 4, and the amount of the added cement paste 17 can be obtained conveniently; meanwhile, in order to facilitate subsequent measurement, the volume of the cement slurry 17 in the cement slurry cup 4 is at least one half of the volume of the curing chamber 5, because the shrinkage and expansion rate of the cement slurry 17 in the forming process is judged by adopting pressure change in the embodiment, if the remaining space in the curing chamber 5 is too large, the influence of the volume change after the shrinkage or expansion of the set cement on the pressure in the curing chamber 5 is small, and the pressure gauge 8 has a certain measurement error, so that the final measurement result has a large error.
To illustrate the relationship between the proportional size of the volume of the curing chamber 5 and the volume of the cement slurry 17 in the cement slurry cup 4 and the accuracy of the final test results, the following example is used: assuming that the working pressure is 10MPa, the error of the measured value d of the pressure gauge is 2%, and the actual shrinkage rate of the set cement is 5%. In example A, the volume a of the curing chamber was 200cm3The volume b1 of the cement paste cup is 140mL, and the size c of the cement paste cup body is 20cm3In another embodiment B, the size of the curing chamber and the cement paste cup body are not changed, and the volume B2 of the cement paste cup is 80cm3The actual shrinkage volume of the cement stone of example A is 7cm3The actual shrinkage volume of the cement stone in example B was 4cm3；
After shrinkage of the set cement, the actual pressure values in example a are: 8.41MPa, the pressure reduction value is 1.59 MPa; the pressure gauge in example B varied by 9.52MPa and the pressure reduction was 0.48 MPa. And since the pressure gauge has an error of 2%, the pressure gauge measurement in example a is: 8.23-8.57MPa, the measured value of pressure reduction is 1.43-1.77MPa, and the error is within 10 percent; pressure gauge measurements in example B: 9.33-9.71MPa, a pressure reduction measurement of 0.29-0.67MPa, and a maximum error of about 40%. Therefore, the more the cement slurry is contained in the cement slurry cup, the smaller the error of final calculation is, and the closer the error is to the true value.
In order to simulate the high-temperature and high-pressure conditions, heating coils 14 are arranged on the inner wall of the kettle body 1, the temperature of the interior of the kettle body 1 can be raised through the heating coils 14, and meanwhile, coil connectors 11 connected with the heating coils 14 are further arranged on the outer side wall of the kettle body 1, so that the kettle is convenient for being externally connected with a power supply; still be provided with pressurization joint 9 and pressure release pipe 13 at the 1 lateral wall of the cauldron body, can pressurize in the cauldron body 1 through pressurization joint 9, after the experiment, accessible pressure release pipe 13 carries out the pressure release to the cauldron body 1.
The measuring system comprises a high-temperature pressure gauge 8 arranged on the testing kettle, a first temperature sensor 6 used for testing the temperature of cement slurry 17 in the cement slurry cup 4 and a second temperature sensor 7 used for testing the temperature of the upper space of the cement slurry cup 4, as shown in figure 1;
specifically, the measurement system mainly has the main functions of ensuring that the experiment is carried out under the conditions of required temperature and pressure, and simultaneously measuring the dynamic change of the volume of the cement stone in the forming process, so as to provide data support for subsequent research. For this purpose, 2 temperature sensors and 1 high temperature pressure gauge 8 are provided, the first temperature sensor 6 extends into the cement paste cup 4 for testing the temperature of the cement paste 17, and the second temperature sensor 7 is arranged in the curing chamber 5 outside the cement paste cup 4 for testing the temperature outside the cement paste cup 4. The high temperature pressure gauge 8 can measure the change of the pressure in the curing room 5, and provides data support for the calculation of the contraction/expansion rate.
The pressurizing system, as shown in fig. 1, comprises a gas source 15 and a booster pump 10 which are connected, and the outlet of the booster pump 10 is connected with a pressurizing joint 9 through a pressurizing pipe 16.
The pressurizing system is used for providing required test pressure in the test kettle, and inert gas is usually used as a pressurizing medium, such as nitrogen and the like, so that the influence of oxygen in the air on the formation of the set cement can be avoided. Meanwhile, in order to avoid the too fast speed of the gas entering the test kettle, the inner diameter of the pressurizing joint 9 is set to be larger, and the inner diameter of the pressurizing pipe 16 is usually one half to one fifth of the inner diameter of the pressurizing joint 9; in order to ensure that the experiment can be carried out smoothly, a valve is also arranged on the pressurizing pipe. In order to avoid that the filling gas has an influence on the cement paste formation, the gas source 15 is provided with an inert gas including nitrogen.
The use method of the volume expansion and contraction tester for the oil well cement under the high-temperature and high-pressure conditions comprises the following steps:
filling cement slurry to be tested in the cement slurry cup, reading out the accurate volume of the cement slurry, placing the cement slurry in a test kettle, and installing equipment; and (3) adjusting the pressure in the kettle body by using a booster pump, starting a heating coil to heat the kettle body, and closing a valve on a pressurizing pipe after the pressure in the kettle body reaches a required value. And recording the pressure change in the maintenance process, and calculating the shrinkage/expansion rate of the cement stone in the experimental process according to the characteristic that the total gas amount is not changed and the pressure change in the test process.
Of course, the utility model discloses a method of using volume expansion and contraction tester under oil well cement high temperature and high pressure condition is not limited to above-mentioned method, and the technical staff in the art can adjust its method of use according to actual conditions.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (5)
1. A volume expansion and contraction tester for oil well cement under high temperature and high pressure conditions is characterized by comprising
The testing kettle comprises a kettle body, an upper end cover and a lower end cover, wherein the upper end cover and the lower end cover are respectively arranged at the upper part and the lower part of the kettle body, a space between the upper end cover and the lower end cover is a curing chamber, a cement cup is arranged in the kettle body, cement slurry is arranged in the cement cup, the volume of the cement slurry is at least one half of the volume of the curing chamber, a heating coil is arranged on the inner wall of the kettle body, and a pressurizing connector and a pressure relief pipe are arranged on the side wall of the kettle body;
the measuring system comprises a high-temperature pressure gauge arranged on the testing kettle, a first temperature sensor used for testing the temperature of cement slurry and a second temperature sensor used for testing the temperature of the upper space of the cement slurry cup;
the pressurization system comprises an air source and a booster pump which are connected, and the outlet of the booster pump is connected with the pressurization joint through a pressurization pipe.
2. The meter of claim 1, wherein the cement cup is provided with a scale.
3. The meter of claim 1, wherein the inner diameter of the pressurization pipe is one half to one fifth of the inner diameter of the pressurization fitting.
4. The meter of claim 1, wherein the volume of the cement cup is at least three-quarters of the volume of the curing chamber.
5. The meter of claim 1, wherein the gas source is an inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120471237.3U CN214374431U (en) | 2021-03-04 | 2021-03-04 | Volume expansion and contraction tester for oil well cement under high-temperature and high-pressure conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120471237.3U CN214374431U (en) | 2021-03-04 | 2021-03-04 | Volume expansion and contraction tester for oil well cement under high-temperature and high-pressure conditions |
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| Publication Number | Publication Date |
|---|---|
| CN214374431U true CN214374431U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120471237.3U Expired - Fee Related CN214374431U (en) | 2021-03-04 | 2021-03-04 | Volume expansion and contraction tester for oil well cement under high-temperature and high-pressure conditions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002416A (en) * | 2021-10-29 | 2022-02-01 | 常州大学 | Cement paste expansion and shrinkage testing device under confining pressure and water curing conditions |
-
2021
- 2021-03-04 CN CN202120471237.3U patent/CN214374431U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002416A (en) * | 2021-10-29 | 2022-02-01 | 常州大学 | Cement paste expansion and shrinkage testing device under confining pressure and water curing conditions |
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Granted publication date: 20211008 |