CN111796079A - Low-temperature water loss instrument for well cementation cement slurry - Google Patents
Low-temperature water loss instrument for well cementation cement slurry Download PDFInfo
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- CN111796079A CN111796079A CN201910281889.8A CN201910281889A CN111796079A CN 111796079 A CN111796079 A CN 111796079A CN 201910281889 A CN201910281889 A CN 201910281889A CN 111796079 A CN111796079 A CN 111796079A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000002002 slurry Substances 0.000 title claims abstract description 58
- 239000004568 cement Substances 0.000 title claims abstract description 54
- 230000008014 freezing Effects 0.000 claims description 27
- 238000007710 freezing Methods 0.000 claims description 27
- 239000003507 refrigerant Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Food Science & Technology (AREA)
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Abstract
The invention provides a low-temperature water loss instrument for well cementation cement slurry, which belongs to the field of well cementation engineering test devices in oil and gas development and comprises a water loss instrument host, wherein the water loss instrument host is arranged on a supporting device; the pulp cup is arranged in the water loss instrument host, and the pulp cup is filled with pulp and used for measuring the water loss amount of the pulp; the temperature control device is arranged in the water loss instrument host, is connected with the pulp cup and controls the temperature of the pulp cup; and the pressurizing device is connected with the pulp cup and controls the air pressure in the pulp cup. The method can simulate the water loss condition of the well cementation cement slurry in a low temperature environment, so as to test the water loss performance of the well cementation cement slurry in the low temperature environment.
Description
Technical Field
The invention relates to a low-temperature water loss instrument for well cementation cement slurry, and belongs to the field of well cementation engineering test devices in oil and gas development.
Background
Cementing projects in oil and gas development typically require the injection of cement slurries. When passing through a high-permeability stratum, cement slurry leaks under the action of certain pressure, so that the cement is dehydrated and the flowability is poor. Therefore, a cement paste system used in a well cementation process is required to have a specific water loss amount, if the water loss amount of the cement paste is not controlled, a large amount of liquid in the cement paste leaks to a stratum, so that the liquid phase content in the cement paste is reduced, the consistency is increased, the cement paste is difficult to pump or even cannot be pumped, further the stratum is damaged to different degrees, the productivity of oil and gas is reduced, and well cementation accidents are caused in severe cases. Under the condition of the problem, a fluid loss agent is usually added into cement slurry to control the water in the cement slurry to leak to a permeable stratum so as to realize safe and efficient well cementation.
The temperature is taken as a main thermodynamic parameter of cement hydration, and directly determines the evolution of the microstructure and the development of the performance of cement slurry. With the continuous expansion of the exploration and development field, the construction environment of the well cementation engineering is also continuously changed, and the use condition of the main material, namely cement, is more and more rigorous. For example, important oil and gas reservoirs in polar cold sea areas are mostly distributed in permafrost regions, the depth can reach 500m, and well cementation construction can be carried out in strata with the temperature of-5 to-8 ℃ and the ice content of 80 percent. In order to ensure proper cement slurry performance, technicians often add a large amount of efficient additives into low-temperature cement to overcome the problem of low cement slurry hydration speed in a low-temperature environment. However, in indoor research, the high-efficiency additive suitable for low-temperature environment often causes the cement paste to hydrate too fast under normal temperature conditions, and the water loss performance of the cement paste changes rapidly, so that the real low-temperature water loss performance of the cement paste cannot be accurately obtained in a laboratory.
Therefore, the water loss performance test conditions and instruments of the low-temperature cement are greatly different from those of the conventional cement. Most of conventional instruments used for indoor research of oil well cement are designed under the conditions of room temperature or high temperature at present, the environmental temperature has great influence on the water loss performance of the cement, and the temperature control is very important for testing the thickening performance of the low-temperature cement. The existing instrument can not meet the requirement of the water loss performance test of cement paste in the environment lower than room temperature.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a low-temperature water loss instrument for well cementation cement slurry, which can simulate the water loss condition of the well cementation cement slurry in a low-temperature environment so as to test the water loss performance of the well cementation cement slurry in the low-temperature environment.
In order to achieve the above object, the present invention provides a low temperature water loss instrument for well cementation cement slurry, comprising:
the water loss instrument host is arranged on the supporting device;
the pulp cup is arranged in the water loss instrument host, and the pulp cup is filled with pulp and used for measuring the water loss amount of the pulp;
the temperature control device is arranged in the water loss instrument host, is connected with the pulp cup and controls the temperature of the pulp cup; and
and the pressurizing device is connected with the pulp cup and controls the air pressure in the pulp cup.
The invention has the further improvement that the pulp cup comprises a cup body with a cylindrical structure, the upper part of the cup body is provided with an air inlet connected with a pressurizing device, and the lower end of the cup body is provided with a liquid outlet.
The invention is further improved in that the temperature control device comprises a built-in refrigerating device connected with the slurry cup, and a control device for controlling the temperature of the built-in refrigerating device.
The invention is further improved in that the built-in refrigerating device comprises a freezing cylinder coated outside the cup body of the slurry cup, and a cooling circulation device is connected to the freezing cylinder.
The invention is further improved in that the cooling circulation device comprises an evaporator pipeline wound outside the freezing cylinder, and an input pipeline and an output pipeline are respectively arranged at two ends of the evaporator pipeline;
wherein, be connected with refrigerant compressor and condenser pipe between input pipeline and the output line.
A further development of the invention is that a throttle valve is arranged on the inlet line.
The invention has the further improvement that a temperature measuring device is arranged on the freezing cylinder and is connected with the input end of the temperature control equipment; the output end of the temperature control device is connected with the refrigeration compressor.
The invention is further improved in that the pressurizing device comprises a nitrogen gas bottle which is connected with the gas inlet of the slurry cup through a gas conduit.
The invention is further improved in that the supporting device comprises a cushion which is horizontally arranged and a plurality of brackets which are arranged on the cushion; wherein, the dehydration appearance host computer sets up to be fixed the upper end of support.
In a further development of the invention, the temperature measuring device is a thermocouple.
Compared with the prior art, the invention has the advantages that:
the low-temperature water loss instrument for the well cementation cement slurry can simulate the water loss condition of the well cementation cement slurry in a low-temperature environment, so that the water loss performance of the well cementation cement slurry in the low-temperature environment can be tested. The problem that the low-temperature water loss performance of the cement paste cannot be tested under the room-temperature condition in a laboratory is solved, the outdoor low-temperature and even negative-temperature condition is truly simulated, the low-temperature water loss performance of the cement paste is tested under the room-temperature environment, and data distortion or over-rapid solidification of the low-temperature cement paste in the water loss testing process at room temperature is prevented.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic external structural view of a cementing slurry low temperature water loss instrument according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the internal structure of the cementing slurry low-temperature water loss instrument according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. the water loss instrument comprises a water loss instrument host machine, 2, a pulp cup, 3, a temperature control device, 4, a pressurizing device, 11, a supporting device, 12, a cushion, 13, a support, 21, an air inlet, 22, a liquid outlet, 31, a built-in refrigerating device, 32, temperature control equipment, 33, a freezing cylinder, 34, an evaporator pipeline, 35, an input pipeline, 36, an output pipeline, 37, a refrigerating compressor, 38, a condensing pipe, 39, a throttling valve, 40, a temperature measuring device, 41, a nitrogen bottle, 42 and a guide pipe.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
FIG. 1 schematically shows a cementing slurry low temperature water loss instrument according to one embodiment of the present invention. According to the low-temperature water loss instrument for the well cementation cement slurry, the water loss condition of the well cementation cement slurry in a low-temperature environment can be simulated, so that the water loss performance of the well cementation cement slurry in the low-temperature environment can be tested.
As shown in fig. 1, a cementing slurry low temperature water loss instrument according to an embodiment of the present invention includes a water loss instrument host 1. The main machine 1 of the water loss instrument is of a box-packed or box-shaped structure and is used for performing a slurry water loss test. The dehydration instrument host 1 is internally provided with a slurry cup 2 which is used for measuring the water loss amount of slurry. The dehydration instrument host 1 is also internally provided with a temperature control device 3, the temperature control device 3 is connected with the pulp cup 2 and can control the temperature in the pulp cup 2, so that the temperature in the pulp cup 2 can be in a low temperature state (usually-5 to-8 ℃) to test the dehydration condition in the low temperature state. The external of the dehydration instrument host 1 is provided with a pressurizing device 4, the pressurizing device 4 is connected with the pulp cup 2 and provides air pressure for the pulp cup 2, so that the pressure in the pulp cup 2 is controlled.
In the low-temperature water loss instrument for well cementation cement slurry according to the embodiment, the temperature control device 3 can rapidly adjust the temperature in the slurry cup 2 to negative temperature so as to ensure that the liquid in the slurry cup 2 is in a low-temperature environment. The pressurizing device 4 can pressurize the slurry cup 2, cement slurry simulates the process of fluid loss to the stratum under the pressurizing condition, filtrate flows out of the slurry cup 2, and the fluid loss performance of the cement slurry can be evaluated by testing the volume of the effluent.
In one embodiment, as shown in fig. 1 and 2, the slurry cup 2 comprises a cup body having a cylindrical structure or a hollow cylindrical structure. The upper part of the cup body is provided with an air inlet 21, and the air inlet 21 is connected with a pressurizing device 4. A liquid outlet 22 is arranged at the lower part of the cup body. The pressurizing device 4 can input pressure into the pulp cup 2 through the air inlet 21, thereby detecting the amount of water loss under different pressures.
In one embodiment, the in-line cooling device 31 includes a freezing cylinder 33. The freezing cylinder 33 is a cylindrical structure, and is covered outside the cup body of the pulp cup 2. The freezing cylinder 33 is connected with a cooling circulation device. The cooling circulation device can take away the heat of the freezing cylinder 33, so that the freezing cylinder 33 is always kept in a low-temperature state and circulates to the outside of the freezing cylinder 33 to dissipate the heat.
In the well cementation cement slurry low temperature dehydration appearance according to this embodiment, can take away the heat in freezing cylinder 33 through cooling cycle device, make freezing cylinder 33 remain the low temperature state all the time to guarantee that the temperature in the thick liquid cup 2 remains cryogenic state all the time. Thereby ensuring that the measurement experiment is carried out smoothly.
In one embodiment, the cooling cycle device includes an evaporator line 34 provided on the freezing cylinder 33, and the evaporator line 34 is uniformly wound on the outer wall of the freezing cylinder 33. An input line 35 and an output line 36 are respectively provided at both ends of the evaporator line 34, and the cooling medium enters the evaporator line 34 from the input line 35 and flows out through the output line 36. A refrigerant compressor 37 and a condenser 38 are connected between the input line 35 and the output line 36. In this embodiment, an input line 35 is provided at an upper port of the evaporator line 34, an output line 36 is provided at a lower port of the evaporator line 34, the input line 35 is connected to a condenser 38, and the output line 36 is connected to a refrigerant compressor 37. The refrigerant compressor 37 is connected to a condenser pipe 38 to form a cycle.
In the cementing slurry low temperature water loss instrument according to the present embodiment, the built-in refrigeration device 31 can control the temperature of the freezing cylinder 33 through the refrigeration compressor 37. The refrigerant gas is pressurized by the refrigerant compressor 37 and fed into the condenser pipe 38, and the gaseous high-pressure refrigerant releases heat in the condenser pipe 38 to form a liquid high-pressure refrigerant. The liquid high-pressure refrigerant evaporator line 34 absorbs heat to be gasified while rapidly lowering the temperature of the freezing cylinder 33. Finally, the low-pressure gas refrigerant enters the compressor again to complete the refrigeration cycle.
In a preferred embodiment, a throttle valve 39 is provided on the input line 35. A throttle valve 39 is provided at the outlet of the condenser pipe 38 and is connected to the inlet of the evaporation line via the inlet line 35. By providing the throttle valve 39, the high-pressure liquid refrigerant flowing out of the condenser pipe 38 can be changed to a low-pressure liquid refrigerant, and the low-pressure liquid refrigerant is more easily vaporized in the evaporator line 34.
In one embodiment, a temperature measuring device 40 is disposed on the freezing cylinder 33, and the temperature measuring device 40 can measure the temperature of the freezing cylinder 33. The temperature measuring device 40 is connected to an input end of the temperature control device 32, and transmits the measured temperature information of the freezing cylinder 33 to the temperature control device 32. The output end of the temperature control device 32 is connected with the refrigeration compressor 37. In a preferred embodiment, the temperature measuring device 40 is a thermocouple.
In the cementing slurry low temperature water loss instrument according to the embodiment, the temperature measuring device 40 can measure the temperature inside the freezing cylinder 33 and transmit the temperature information to the temperature control device 32. The temperature control device 32 judges whether the temperature in the freezing cylinder 33 is normal or not according to the temperature information, and controls the operation of the refrigeration compressor 37 if the temperature is too high, so that the temperature in the freezing cylinder 33 is rapidly reduced; if the temperature is too low, the operation of the refrigerant compressor 37 is controlled to be stopped. The temperature control device can also control the power supply of the thickening instrument and control the operation of the built-in refrigerating device 31.
In one embodiment, the pressurizing means 4 comprises a nitrogen gas cylinder 41, the nitrogen gas cylinder 41 being connected to the gas inlet 21 of the pulp cup 2 via a gas conduit 42. Preferably, the conduit 42 is provided with a valve to control the amount of gas input. The conduit 42 may be provided with a flow meter, a pressure meter, or the like, and the pressure state of the pressurization can be determined by the flow meter and the pressure meter.
In one embodiment, the support device 11 includes a horizontally disposed seat cushion 12, and a plurality of brackets 13 disposed on the seat cushion 12. Wherein, the dehydration appearance host computer 1 sets up to be fixed the upper end of support 13. The shape of cushion 12 and the shape phase-match of losing water appearance host computer 1, the corresponding setting downwards, the quantity of support 13 is three at least, preferably four, sets up respectively on the four corners of losing water appearance host computer 1 lower terminal surface. Through the strutting arrangement 11 among the well cementation cement paste low temperature water loss instrument according to this embodiment, can set up water loss instrument host 1 in suitable high position.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A low-temperature water loss instrument for well cementation cement slurry is characterized by comprising:
the water loss instrument host is arranged on the supporting device;
the pulp cup is arranged in the water loss instrument host, and the pulp cup is filled with pulp and used for measuring the water loss amount of the pulp;
the temperature control device is arranged in the water loss instrument host, is connected with the pulp cup and controls the temperature of the pulp cup; and
and the pressurizing device is connected with the pulp cup and controls the air pressure in the pulp cup.
2. The low-temperature water loss instrument for well cementation cement slurry as claimed in claim 1, wherein the slurry cup comprises a cup body with a cylindrical structure, an air inlet connected with a pressurizing device is arranged at the upper part of the cup body, and a liquid outlet is arranged at the lower end of the cup body.
3. The cementing slurry low temperature water loss instrument according to claim 2, wherein the temperature control device comprises a built-in refrigeration device connected with the slurry cup, and a control device for controlling the temperature of the built-in refrigeration device.
4. The well cementation cement slurry low temperature water loss instrument according to claim 3, wherein the built-in refrigerating device comprises a freezing cylinder coated outside a cup body of the slurry cup, and a cooling circulation device is connected to the freezing cylinder.
5. The cementing slurry low temperature water loss instrument according to claim 4, wherein the cooling circulation device comprises an evaporator pipeline wound outside the freezing cylinder, and an input pipeline and an output pipeline are respectively arranged at two ends of the evaporator pipeline;
wherein, be connected with refrigerant compressor and condenser pipe between input pipeline and the output line.
6. The cementing slurry low temperature water loss instrument according to claim 5, wherein a throttle valve is arranged on the input pipeline.
7. The well cementation cement slurry low temperature water loss instrument according to any one of claims 4 to 6, wherein a temperature measuring device is arranged on the freezing cylinder, and the temperature measuring device is connected with an input end of the temperature control equipment; the output end of the temperature control device is connected with the refrigeration compressor.
8. The cementing slurry low temperature water loss instrument according to claim 7, wherein the pressurizing device comprises a nitrogen gas cylinder, and the nitrogen gas cylinder is connected with the gas inlet of the slurry cup through a gas conduit.
9. The well cementation cement slurry low temperature water loss instrument according to claim 8, wherein the support device comprises a cushion arranged horizontally, and a plurality of brackets arranged on the cushion; wherein, the dehydration appearance host computer sets up to be fixed the upper end of support.
10. The cementing slurry low temperature water loss instrument of claim 7, wherein the temperature measuring device is a thermocouple.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910281889.8A CN111796079A (en) | 2019-04-09 | 2019-04-09 | Low-temperature water loss instrument for well cementation cement slurry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910281889.8A CN111796079A (en) | 2019-04-09 | 2019-04-09 | Low-temperature water loss instrument for well cementation cement slurry |
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2019
- 2019-04-09 CN CN201910281889.8A patent/CN111796079A/en active Pending
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