CN111206901A - Nitrogen foam cement preparation device and preparation method thereof - Google Patents
Nitrogen foam cement preparation device and preparation method thereof Download PDFInfo
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- CN111206901A CN111206901A CN202010060244.4A CN202010060244A CN111206901A CN 111206901 A CN111206901 A CN 111206901A CN 202010060244 A CN202010060244 A CN 202010060244A CN 111206901 A CN111206901 A CN 111206901A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 332
- 239000006260 foam Substances 0.000 title claims abstract description 208
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 165
- 239000004568 cement Substances 0.000 title claims abstract description 162
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 195
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims description 25
- 238000010276 construction Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000012141 concentrate Substances 0.000 claims description 8
- 238000002309 gasification Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000007791 liquid phase Substances 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 244000019194 Sorbus aucuparia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000006414 serbal de cazadores Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention discloses a nitrogen foam cement preparation device and a preparation method thereof. The heat generated by devices such as a power unit, a hydraulic system and the like in the nitrogen foam well cementation device is recovered through a heat exchange system, and the recovered heat is used as a heat source of a liquid nitrogen evaporator, so that the method is energy-saving and environment-friendly, the energy utilization rate is high, and the equipment investment is low; a high-pressure liquid nitrogen plunger pump and a high-pressure foam liquid plunger pump are adopted to pressurize the liquid nitrogen and the foam liquid, so that the mixing uniformity is increased, and the density of the foam cement is reduced; a density detection device is arranged to detect the density of the foam cement in real time, and the flow of liquid nitrogen and/or foam liquid is adjusted according to the density, so that the density control is simple; the clear water tank is arranged, and equipment and pipelines are flushed after the operation is finished, so that the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of oil field well cementation, in particular to a nitrogen foam cement preparation device and a preparation method thereof.
Background
In oil and gas field cementing operations, cement loss is one of the problems generally faced in the field of cementing. Along with the continuous deepening of the oil and gas exploration and development degree in China, the leakage proportion of well cementation cement is increased rapidly, the well cementation quality is seriously influenced, and the risk of annulus pressure is increased. Compared with conventional cement, the foam cement slurry has the characteristics of low density, high strength, good elastic plasticity and the like, and has remarkable advantages in the aspects of leakage prevention, channeling prevention and displacement efficiency improvement. At present, foam cement is usually prepared by adopting a physical foaming method, namely, foam liquid prepared in advance is mixed with cement slurry or foam cement is formed by directly injecting gas into the cement slurry containing the foam liquid. The method causes the separation of foam liquid and cement paste or the ineffective mixing of the foam liquid and the cement paste due to low foam pressure and high cement paste pressure, and the high-pressure work of well cementation is difficult to meet. Therefore, the inflatable method for preparing the foam cement is receiving more and more attention. The nitrogen is stable in chemical property, generally does not react with other substances, can play roles of isolation, flame retardance, explosion prevention and corrosion prevention, has little damage to a reservoir stratum, and becomes a preferable inflation medium for the foam cement. The existing preparation device for the inflatable foam cement cannot monitor the density of the foam cement in real time, and if the density of the foam cement cannot meet the construction requirement, the well cementation cost is increased and even the well cementation fails; in addition, the method needs to be provided with a special heating device for heating the liquid nitrogen, and has high energy consumption, equipment investment and operation cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a nitrogen foam cement preparation device and a preparation method thereof, wherein heat generated by devices such as a power unit, a hydraulic system, a lubricating system and the like in a nitrogen foam well cementation device is recovered through a heat exchange system, and the recovered heat is used as a heat source of a liquid nitrogen evaporator to provide heat for liquid nitrogen gasification, so that the nitrogen foam cement preparation device is low in energy consumption, energy-saving, environment-friendly, high in energy utilization rate, low in equipment investment and low in operation cost; the liquid nitrogen and the foam liquid are pressurized by adopting a high-pressure liquid nitrogen plunger pump and a high-pressure foam liquid plunger pump, so that the mixing uniformity is increased, and the density of the foam cement is reduced; the density detection device is arranged to detect the density of the foam cement in real time, and the flow of the liquid nitrogen and/or the foam liquid is adjusted according to the density, so that the density control is simple; the clear water tank is arranged, and equipment such as a foam cement generator and the like is washed after well cementation operation is finished, so that the service life of the equipment is prolonged.
The aim of the invention is achieved by the following technical measures: a nitrogen foam cement preparation device comprises a foam cement generator, a liquid nitrogen evaporator, a liquid nitrogen plunger pump, a foam liquid box, a heat exchange system, a liquid nitrogen pipeline, a high-pressure cement slurry pipeline, a first pipeline, a foam cement discharge pipeline and a density detection device, wherein the foam cement generator is provided with a gas phase inlet and a liquid phase inlet, the liquid nitrogen pipeline is connected with the inlet of the liquid nitrogen plunger pump, the outlet of the liquid nitrogen plunger pump is connected with the inlet of the liquid nitrogen evaporator, the outlet of the liquid nitrogen evaporator is connected with the gas phase inlet of the foam cement generator, the outlet of the foam liquid box is connected with the inlet of the foam liquid plunger pump, the outlet of the foam liquid plunger pump is connected with the liquid phase inlet of the foam cement generator through the first pipeline, and the high-pressure cement slurry pipeline is converged with the first pipeline, the outlet of the foam cement generator is connected with a foam cement discharge pipeline, a density detection device is arranged on the foam cement discharge pipeline, and the heat exchange system provides a heat source for the liquid nitrogen evaporator.
Furthermore, the preparation device also comprises a water tank, the liquid nitrogen evaporator is also provided with a heat source inlet and a heat source outlet, the outlet of the heat exchange system is connected with the inlet of the water tank, the outlet of the water tank is connected with the heat source inlet, and the heat source outlet is connected with the inlet of the heat exchange system.
Further, the preparation device also comprises a clear water tank, and the clear water tank is connected with an inlet of the foam liquid tank.
Further, the preparation device also comprises a control device, and the control device is used for controlling the flow of the liquid nitrogen and/or the foam concentrate.
Further, the preparation device also comprises a liquid nitrogen liquid return pipeline, and the liquid nitrogen liquid return pipeline is connected with an inlet of the liquid nitrogen plunger pump.
Further, the preparation apparatus may be used on-vehicle or alone.
A preparation method of nitrogen foam cement comprises the following steps:
(1) pressurizing liquid nitrogen by a liquid nitrogen plunger pump, conveying the liquid nitrogen into a liquid nitrogen evaporator for gasification, and conveying the gasified nitrogen to a foam cement generator;
(2) pressurizing the foam liquid by a foam liquid plunger pump, then converging the foam liquid with high-pressure cement slurry, premixing the high-pressure cement slurry and the foam liquid in a pipeline, and then conveying the premixed foam liquid and the premixed foam liquid to a foam cement generator;
(3) mixing nitrogen and high-pressure cement slurry containing foam liquid in a foam cement generator to form foam cement, and discharging the foam cement from the foam cement generator;
(4) the density detection device is used for detecting the density of the discharged foam cement, if the density of the foam cement meets the construction requirement, the foam cement is output by a foam cement discharge pipeline and is used for well cementation operation, if the density of the foam cement does not meet the construction requirement, the foam cement is discharged, the flow rate of foam liquid and/or the flow rate of liquid nitrogen are/is adjusted through the control device, and the density of the foam cement is detected again until the density of the foam cement meets the construction requirement;
(5) and after the construction is finished, cleaning the foam cement generator by using clear water.
Further, in the step (1), the heat source required for the liquid nitrogen evaporator to perform gasification is provided by a heat exchange system.
Further, the temperature of the nitrogen gas vaporized in the liquid nitrogen evaporator is 15-21 ℃.
Further, the working pressure of the liquid nitrogen plunger pump is 20-45 MPa.
Furthermore, the working pressure of the foam liquid plunger pump is 30-35 MPa.
Further, the control device in the step (4) realizes the adjustment of the flow rate of the liquid nitrogen and/or the foam concentrate by controlling the rotating speed of the liquid nitrogen plunger pump and/or the rotating speed of the foam concentrate plunger pump.
Compared with the prior art, the invention has the beneficial effects that: according to the nitrogen foam cement preparation device and the preparation method thereof, heat generated by devices such as a power unit, a hydraulic system and a lubricating system in a well cementation device is recovered through a heat exchange system, and the recovered heat is used as a heat source of a liquid nitrogen evaporator to provide heat for liquid nitrogen gasification, so that the device is low in energy consumption, energy-saving, environment-friendly, high in energy utilization rate, low in equipment investment and low in operation cost; the liquid nitrogen and the foam liquid are pressurized by adopting a high-pressure liquid nitrogen plunger pump and a high-pressure foam liquid plunger pump, so that the mixing uniformity is increased, and the density of the foam cement is reduced; the density detection device is arranged to detect the density of the foam cement in real time, and the flow of the liquid nitrogen and/or the foam liquid is adjusted according to the density, so that the density control is simple; the clear water tank is arranged, and equipment such as a foam cement generator and the like is washed after well cementation operation is finished, so that the service life of the equipment is prolonged.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic structural view of the nitrogen foam cement production apparatus.
The system comprises a foam cement generator 1, a liquid nitrogen plunger pump 2, a heat exchange system 3, a foam liquid plunger pump 4, a foam liquid tank 5, a liquid nitrogen evaporator 6, a water tank 7, a liquid nitrogen pipeline 8, a liquid nitrogen return pipeline 9, a clear water tank 10, a high-pressure cement slurry pipeline 11, a density detection device 12, a first pipeline 13 and a foam cement discharge pipeline 14.
Detailed Description
As shown in figure 1, the nitrogen foam cement preparation device comprises a foam cement generator 1, a liquid nitrogen evaporator 6, a liquid nitrogen plunger pump 2, a foam liquid plunger pump, a foam liquid box 5, a heat exchange system 3, a liquid nitrogen pipeline 8, a high-pressure cement slurry pipeline 11, a first pipeline 13, a foam cement discharge pipeline 14 and a density detection device 12. The preparation device further comprises a power device, and the power device provides power for the preparation device. The foam cement generator 1 is provided with a gas-phase inlet and a liquid-phase inlet, the liquid nitrogen pipeline 8 is connected with the inlet of the liquid nitrogen plunger pump 2, the outlet of the liquid nitrogen plunger pump 2 is connected with the inlet of the liquid nitrogen evaporator 6, and further the maximum working pressure of the liquid nitrogen plunger pump 2 is 69 MPa. An outlet of the liquid nitrogen evaporator 6 is connected with a gas-phase inlet of the foam cement generator 1, an outlet of the foam liquid tank 5 is connected with an inlet of the foam liquid plunger pump 4, an outlet of the foam liquid plunger pump 4 is connected with a liquid-phase inlet of the foam cement generator 1 through a first pipeline 13, and further the maximum working pressure of the foam liquid plunger pump 4 is 40 MPa. The high-pressure cement slurry pipeline 11 is merged with the first pipeline 13, the high-pressure cement slurry pipeline is used for conveying high-pressure cement slurry, and the high-pressure cement slurry and foam liquid are merged and premixed in the first pipeline 13. The outlet of the foam cement generator 1 is connected with a foam cement discharge pipeline 14, a density detection device 12 is arranged on the foam cement discharge pipeline 14, and the heat exchange system 3 provides a heat source for the liquid nitrogen evaporator 6.
The preparation device further comprises a water tank 7, the liquid nitrogen evaporator 6 is further provided with a heat source inlet and a heat source outlet, the outlet of the heat exchange system 3 is connected with the inlet of the water tank 7, the outlet of the water tank 7 is connected with the heat source inlet, and the heat source outlet is connected with the inlet of the heat exchange system 3. The heat source medium is water, a circulating water path is formed among the heat exchange system 3, the water tank 7 and the liquid nitrogen evaporator 6, the heat exchange system 3 recovers heat generated by devices such as a power unit, a hydraulic system and a lubricating system in the well cementation device and heats and raises the temperature of the circulating water, the circulating water enters the water tank 7 for caching, the circulating water cached in the water tank 7 enters the liquid nitrogen evaporator 6 and exchanges heat with low-temperature liquid nitrogen in the liquid nitrogen evaporator 6 to provide heat for liquid nitrogen gasification, and the circulating water cooled after heat exchange enters the heat exchange system 3 again for heating and raising the temperature. The liquid nitrogen is gasified by utilizing the recovered waste heat, so that the energy consumption is low, the energy is saved, the environment is protected, the energy utilization rate is high, a heating device is not required to be independently arranged, the equipment investment is reduced, and the operation cost is low.
The preparation device further comprises a clean water tank 10, and the clean water tank 10 is connected with an inlet of the foam liquid tank 5. After the well cementation operation is finished, equipment and pipelines such as a foam liquid pipeline, a foam liquid plunger pump 4, a foam cement generator 1, a foam cement discharge pipeline 14 and the like are flushed by using clear water in a clear water tank 10, so that the corrosion of the foam liquid equipment and the pipelines is reduced, the equipment pipelines are prevented from being blocked by cement solidification, and the service life of the equipment is prolonged.
The preparation device also comprises a control device, and the control device is used for controlling the flow of the liquid nitrogen and/or the foam concentrate. The preparation device is used for controlling and detecting various parameters of equipment, comprises system start-stop, pressure detection, temperature detection, density detection, flow detection and the like, and is mainly used for controlling and adjusting the flow of foam liquid and the flow of liquid nitrogen according to density detection parameters so as to adjust and control the density of the foam cement slurry.
The preparation device also comprises a liquid nitrogen liquid return pipeline 9, and the liquid nitrogen liquid return pipeline 9 is connected with an inlet of the liquid nitrogen plunger pump 2. The liquid nitrogen loop pipeline 9 is connected with a liquid nitrogen storage tank, and the liquid nitrogen loop pipeline 9 is used for enabling redundant liquid nitrogen at the inlet of the liquid nitrogen plunger pump 2 to flow back into the liquid nitrogen storage tank, so that the liquid nitrogen plunger pump 2 can conveniently adjust the flow of the liquid nitrogen.
The preparation device can be used on a vehicle or independently. The nitrogen foam cement preparation device has a compact structure and small occupied space, and can be arranged into a well cementation vehicle-mounted device and can also be independently arranged on a well cementation site for use.
The preparation device can also be used as a nitrogen source when foam cement is not prepared. If the nitrogen foam cement is not needed in the well cementation operation process, the preparation device can also be used for providing nitrogen, namely the liquid nitrogen pipeline 8 conveys liquid nitrogen to the liquid nitrogen plunger pump 2, the liquid nitrogen plunger pump 2 conveys the liquid nitrogen into the liquid nitrogen evaporator 6 to exchange heat with a heat source provided by the heat exchange system 3, the liquid nitrogen is heated and gasified into the nitrogen after the heat exchange, and the nitrogen can be provided for other well cementation operations. And the temperature of the supplied nitrogen can be set according to actual operation requirements.
A preparation method of nitrogen foam cement comprises the following steps:
(1) liquid nitrogen is conveyed to the liquid nitrogen plunger pump 2 through a liquid nitrogen pipeline 8, is pressurized by the liquid nitrogen plunger pump 2 and then is conveyed to the liquid nitrogen evaporator 6, the liquid nitrogen exchanges heat with a heat source provided by the heat exchange system 3 in the liquid nitrogen evaporator 6, and the liquid nitrogen is heated and gasified into nitrogen after heat exchange and is conveyed to the foam cement generator 1; further preferably, the working pressure of the liquid nitrogen plunger pump 2 is 20-45 MPa. The temperature of the nitrogen gas gasified in the liquid nitrogen evaporator 6 is 15-21 ℃. The heat generated by devices such as a power unit, a hydraulic system, a lubricating system and the like in the well cementation device is recovered through the heat exchange system 3, and the recovered heat is used as a heat source of the liquid nitrogen evaporator 6 to provide heat for liquid nitrogen gasification, so that the energy consumption is low, the energy is saved, the environment is protected, and the energy utilization rate is high. The high-pressure liquid nitrogen plunger pump 2 can increase the pressure of liquid nitrogen, so that the pressure of nitrogen is increased, and the quality of foam cement is improved.
(2) The foam liquid is conveyed to a foam liquid plunger pump 4 from a foam liquid box 5, is pressurized by the foam liquid plunger pump 4 and then is merged with the high-pressure cement slurry conveyed by a high-pressure cement slurry pipeline 11 in a first pipeline 13, and the high-pressure cement slurry and the foam liquid are premixed in the first pipeline 13 and then are conveyed to a foam cement generator 1; more preferably, the working pressure of the foam concentrate plunger pump 4 is 30-35 MPa. The high-pressure foam liquid and the high-pressure cement paste are premixed in the first pipeline 13, so that the mixing uniformity of the high-pressure foam liquid and the high-pressure cement paste is improved, the subsequent increase of the uniformity of the subsequently prepared foam cement is facilitated, and the density of the foam cement is reduced.
(3) The nitrogen and the high-pressure cement slurry containing the foam liquid are mixed in the foam cement generator 1 to form foam cement, and the foam cement is discharged from the foam cement generator 1 to a foam cement rowAn outlet line 14; mixing high-pressure nitrogen, high-pressure foam water and high-pressure cement slurry in a foam cement generator 1 to generate high-pressure foam cement, wherein the pressure of the foam cement can reach 30-40MPa, and the density of the foam cement is 0.3-0.7g/cm3The density of the foamed cement is reduced.
(4) The density detection device 12 is used for detecting the density of the foam cement discharged by the foam cement discharge pipeline 14, if the density of the foam cement meets the construction requirement, the foam cement is output by the foam cement discharge pipeline 14 and is used for well cementation operation, if the density of the foam cement does not meet the construction requirement, the foam cement is discharged, the flow rate of foam liquid and/or the flow rate of liquid nitrogen are/is adjusted through the control device, and the density of the foam cement is detected again until the density of the foam cement meets the construction requirement; further preferably, the control device controls the rotation speed of the liquid nitrogen plunger pump 2 and/or the rotation speed of the foam concentrate plunger pump 4 to realize the adjustment of the flow rate of the liquid nitrogen and/or the foam concentrate. The foam cement meeting construction requirements is prepared by detecting the density of the foam cement in real time and adjusting the flow of foam liquid and/or the flow of liquid nitrogen in real time, and the foam cement with different densities can be prepared according to different requirements.
(5) After the construction is finished, the foam cement generator 1 is cleaned by clean water in the clean water tank 10. The cleanness of the pipeline and the equipment is ensured, and the pipeline and the equipment are prevented from being blocked.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (12)
1. A nitrogen foam cement preparation device is characterized by comprising a foam cement generator, a liquid nitrogen evaporator, a liquid nitrogen plunger pump, a foam liquid box, a heat exchange system, a liquid nitrogen pipeline, a high-pressure cement slurry pipeline, a first pipeline, a foam cement discharge pipeline and a density detection device, wherein the foam cement generator is provided with a gas phase inlet and a liquid phase inlet, the liquid nitrogen pipeline is connected with the inlet of the liquid nitrogen plunger pump, the outlet of the liquid nitrogen plunger pump is connected with the inlet of the liquid nitrogen evaporator, the outlet of the liquid nitrogen evaporator is connected with the gas phase inlet of the foam cement generator, the outlet of the foam liquid box is connected with the inlet of the foam liquid plunger pump, the outlet of the foam liquid plunger pump is connected with the liquid phase inlet of the foam cement generator through the first pipeline, and the high-pressure cement slurry pipeline is converged with the first pipeline, the outlet of the foam cement generator is connected with a foam cement discharge pipeline, a density detection device is arranged on the foam cement discharge pipeline, and the heat exchange system provides a heat source for the liquid nitrogen evaporator.
2. The nitrogen foam cement manufacturing apparatus according to claim 1, characterized in that: the preparation device further comprises a water tank, the liquid nitrogen evaporator is further provided with a heat source inlet and a heat source outlet, the outlet of the heat exchange system is connected with the inlet of the water tank, the outlet of the water tank is connected with the heat source inlet, and the heat source outlet is connected with the inlet of the heat exchange system.
3. The nitrogen foam cement manufacturing apparatus according to claim 1, characterized in that: the preparation device also comprises a clean water tank, and the clean water tank is connected with an inlet of the foam liquid tank.
4. The nitrogen foam cement manufacturing apparatus according to claim 1, characterized in that: the preparation device also comprises a control device, and the control device is used for controlling the flow of the liquid nitrogen and/or the foam concentrate.
5. The nitrogen foam cement manufacturing apparatus according to claim 1, characterized in that: the preparation device also comprises a liquid nitrogen liquid return pipeline, and the liquid nitrogen liquid return pipeline is connected with an inlet of the liquid nitrogen plunger pump.
6. The nitrogen foam cement manufacturing apparatus according to claim 1, characterized in that: the preparation device can be used on a vehicle or independently.
7. The production method of nitrogen foam cement production equipment according to any one of claims 1 to 6, characterized in that: the preparation method comprises the following steps:
(1) pressurizing liquid nitrogen by a liquid nitrogen plunger pump, conveying the liquid nitrogen into a liquid nitrogen evaporator for gasification, and conveying the gasified nitrogen to a foam cement generator;
(2) pressurizing foam liquid by a foam liquid plunger pump, then converging the pressurized foam liquid with high-pressure cement slurry, premixing the high-pressure cement slurry and the foam liquid in a first pipeline, and then conveying the premixed foam liquid and the foam liquid to a foam cement generator;
(3) mixing nitrogen and high-pressure cement slurry containing foam liquid in a foam cement generator to form foam cement, and discharging the foam cement from the foam cement generator;
(4) the density detection device is used for detecting the density of the discharged foam cement, if the density of the foam cement meets the construction requirement, the foam cement is output by a foam cement discharge pipeline and is used for well cementation operation, if the density of the foam cement does not meet the construction requirement, the foam cement is discharged, the flow rate of foam liquid and/or the flow rate of liquid nitrogen are/is adjusted through the control device, and the density of the foam cement is detected again until the density of the foam cement meets the construction requirement;
(5) and after the construction is finished, cleaning the foam cement generator by using clear water.
8. The nitrogen foam cement production method according to claim 7, characterized in that: in the step (1), a heat source required by the liquid nitrogen evaporator for gasification is provided by a heat exchange system.
9. The nitrogen foam cement production method according to claim 7, characterized in that: the temperature of the gasified nitrogen in the liquid nitrogen evaporator is 15-21 ℃.
10. The nitrogen foam cement production method according to claim 7, characterized in that: the working pressure of the liquid nitrogen plunger pump is 20-45 MPa.
11. The nitrogen foam cement production method according to claim 7, characterized in that: the working pressure of the foam liquid plunger pump is 30-35 MPa.
12. The nitrogen foam cement production method according to claim 7, characterized in that: and (4) the control device in the step (4) adjusts the flow of the liquid nitrogen and/or the foam liquid by controlling the rotating speed of the liquid nitrogen plunger pump and/or the rotating speed of the foam liquid plunger pump.
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Application publication date: 20200529 |
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