CN111888960A - Foam generating device for petroleum drilling and production well cementation operation and foaming method thereof - Google Patents
Foam generating device for petroleum drilling and production well cementation operation and foaming method thereof Download PDFInfo
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- CN111888960A CN111888960A CN202010746413.XA CN202010746413A CN111888960A CN 111888960 A CN111888960 A CN 111888960A CN 202010746413 A CN202010746413 A CN 202010746413A CN 111888960 A CN111888960 A CN 111888960A
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- 239000006260 foam Substances 0.000 title claims abstract description 53
- 238000005553 drilling Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005187 foaming Methods 0.000 title claims abstract description 8
- 239000003208 petroleum Substances 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title description 8
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 239000004568 cement Substances 0.000 claims abstract description 68
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000002002 slurry Substances 0.000 claims abstract description 60
- 238000009792 diffusion process Methods 0.000 claims abstract description 53
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 238000010008 shearing Methods 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 claims description 53
- 230000000996 additive effect Effects 0.000 claims description 53
- 238000003756 stirring Methods 0.000 claims description 21
- 210000004907 gland Anatomy 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
Abstract
The invention provides a foam generating device for oil drilling and well cementation operation and a foaming method thereof, wherein a liquid outlet of a first-stage mixer is communicated with a liquid inlet of a second-stage mixer, the liquid inlet of the first-stage mixer is communicated with a pump body of a well cementation vehicle, the first-stage mixer is communicated with a liquid adding device, the liquid inlet of the second-stage mixer is communicated with a nitrogen generating device, a uniform mixer is arranged on each of the first-stage mixer and the second-stage mixer, and the structure of the first-stage mixer is as follows: the first mixing cavity is communicated with a first diffusion pipe, the first diffusion pipe is communicated with a bent pipe, the bent pipe is communicated with a first uniform mixer, the first uniform mixer is communicated with a second-stage mixer, and solid, liquid and gaseous flow-phase media are mixed by adopting a Venturi jet mixing principle, a turbulent mixing principle and a shearing mixing principle to form foam cement slurry with stable density and uniform mixing.
Description
Technical Field
The invention relates to the field of petroleum drilling, production and well cementation operation equipment, in particular to a foam generating device and a foam generating method for petroleum drilling, production and well cementation operation, which are suitable for low-density well cementation operation.
Background
With the continuous increase of shale gas development strength, the current well cementation operation has the characteristics of long horizontal section and inclined well section, the problems of eccentricity of a casing pipe, easy leakage at low pressure and the like are increasingly prominent, and higher requirements are put forward on low-density cement slurry in well cementation construction. The foam cement slurry well cementation technology can realize the preparation of low-density cement slurry, improve the problems of easy-to-leak stratum well leakage, reduce the eccentricity of a casing pipe and the like, and is popularized and applied abroad.
Foam cement slurry cementing systems from Harinbington, BJ, etc. represent an advanced level of foam cementing. The matched cement paste preparation system, the computer control system and the matched construction process are industrially applied on site. At present, the foam slurry mixing equipment is relatively lagged behind in the aspect in China and is lack of reliable foam slurry mixing equipment. The foam generating device is a core component for foam cementing.
Chinese patent CN 105418155 a "foam generator for foam cement slurry cementing" discloses a foam generator for foam cement slurry cementing, which comprises a cement slurry injection component, the cement slurry injection component has a feed inlet along the axial direction; the nitrogen injection assembly comprises a radial gas inlet and a premixing cavity which is communicated with the gas inlet and the feed inlet and is arranged along the axial direction; and a homogenizer assembly. Wherein, an air distribution cylinder comprising a sonic nozzle is arranged on the inner wall of the premixing cavity. The axis body of the structure of homogenizer subassembly is bigger, leads to whole foaming structure trafficability characteristic poor, and cement thick liquid still need mix with the additive outward again with nitrogen gas mixture, mixing apparatus dispersion, and trafficability characteristic is poor.
Chinese patent CN 109397538A 'a foam cement slurry generator, a cement slurry pressurized inflation device and application thereof' provides a foam generator which can be used for preparing foam cement slurry for oil-gas well cementation, a cement slurry pressurized inflation device based on the foam generator and application thereof. The distance between this structure mixing cavity and the spiral piece is less, and known mixing cavity is same cavity with spiral set in the picture, and high-pressure nitrogen gas directly blows off foam cement thick liquid, leads to foam cement thick liquid can't enter into the inside cavity of spiral set, as long as the foam cement thick liquid velocity of flow is too big, and the foaming effect is extremely poor, leads to foam production extremely poor.
Chinese patent CN 204252939U, "a pressure type well cementation foam cement generating device", provides a pressure type well cementation foam cement generating device. The mixer is internally provided with a foam mixing chamber, a throat pipe and a nozzle which are mutually communicated, the throat pipe is communicated with a nitrogen inlet in the vertical direction, flow control valves are respectively arranged at two ends of a cement slurry inlet and the nitrogen inlet of the mixer, a sealing gasket is arranged at the contact part of the mixer and the flow control valves, a reducing joint assembly is connected with the mixer by a fan-shaped check ring, a wing nut and a spring retainer ring, and a mixed liquid discharge port is communicated with the foam mixing chamber through the reducing joint assembly. Without a mixing device, the mixing effect is mixed substantially by pressure, resulting in a situation where cement foam is packed out.
Disclosure of Invention
The invention mainly aims to provide a foam generating device for petroleum drilling and production well cementation operation and a foaming method thereof, and solves the problems of unstable density and uneven distribution of bubbles of foam cement slurry during foam well cementation operation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a foam generating device for oil drilling and production well cementation operation is characterized in that a liquid outlet of a first-stage mixer is communicated with a liquid inlet of a second-stage mixer, a liquid inlet of the first-stage mixer is communicated with a pump body of a well cementation vehicle, the first-stage mixer is communicated with a liquid adding device, the liquid inlet of the second-stage mixer is communicated with a nitrogen generating device, and uniform mixers are arranged on the first-stage mixer and the second-stage mixer.
In the preferred scheme, the structure of the first-stage mixer is as follows: the first mixing cavity is communicated with a first diffusion pipe, the first diffusion pipe is communicated with a bent pipe, the bent pipe is communicated with a first uniform mixer, and the first uniform mixer is communicated with a second-stage mixer.
In a preferred scheme, the structure of the secondary mixer is as follows: the second mixing chamber is communicated with the first homomixer, one end of the second mixing chamber is communicated with the nitrogen generating device, the other end of the second mixing chamber is communicated with a second diffusion pipe, and the second diffusion pipe is communicated with the second homomixer.
In the preferred scheme, one end of the first mixing cavity is provided with a first nozzle which is communicated with a pump body of the well cementation vehicle, one side of the first mixing cavity is provided with an additive inlet, and the additive inlet is communicated with a liquid adding device;
the first nozzle is locked at the liquid inlet of the first mixing cavity through a plurality of locking nuts.
In the preferred scheme, the end part of the first nozzle extends into the first mixing cavity, the end part is arranged at the position of an additive inlet, and the end part of the first nozzle is of a conical structure;
the first nozzle sprays the cement-based slurry, so that the liquid additive is sucked from the additive inlet under the negative pressure inside the first mixing cavity, and the high-pressure cement-based slurry is mixed with the liquid additive through high-speed shearing.
In the preferred scheme, the inside of the first diffusion pipe is communicated with the first mixing cavity through a thin pipe, the pipe diameter of the pipeline in the first diffusion pipe is larger as the pipe diameter is farther away from the first mixing cavity, the first diffusion pipe is in threaded connection with the first mixing cavity, and the outside of the first diffusion pipe is clamped through a locking ring;
the first diffusion pipe is clamped with the bent pipe or the first uniform mixer through a clamping seat.
In the preferred scheme, first diffuser pipe end and first mixing chamber threaded connection, locking ring and first diffuser pipe end threaded connection, the locking ring supports and leans on first mixing chamber terminal surface.
In the preferred scheme, the end part of the second diffusion pipe is clamped with the second uniform mixer through a clamping seat;
the end part of the second uniform mixer is provided with a clamping ring, the end part of the clamping ring is abutted against a boss of the second uniform mixer and is in threaded connection with the second uniform mixer, the inner part of one end of the clamping seat is clamped on the boss of the clamping ring for limiting, the other end of the clamping seat is in threaded connection with a second diffusion pipe, and a sealing gasket is arranged between the second uniform mixer and the second diffusion pipe.
In the preferred scheme, the first uniform mixer comprises a cylinder body, a stirring shaft is arranged in the cylinder body, a plurality of stirring blades which are spirally distributed are arranged on the periphery of the stirring shaft, glands are arranged at two ends of the cylinder body, the stirring shaft is rotatably connected with the glands, and a plurality of through holes are formed in the glands.
The method comprises the following steps:
s1, the pump body of the well cementation vehicle is communicated with a first mixing cavity of the electric valve through a flowmeter, high-pressure cement-based slurry discharged by the electric valve well cementation vehicle is started to be injected from a first nozzle in the first mixing cavity to form high-pressure jet flow, and negative pressure is formed inside the first nozzle;
s2, the electric valve is opened by the liquid adding device, the pumped liquid additive is sucked into the first mixing cavity from the additive inlet of the first mixing cavity under the action of negative pressure, and then is sheared at high speed by the high-pressure cement-based slurry injected from the first mixing cavity to play a mixing role;
s3, the mixed liquid of the cement-based slurry and the liquid additive passes through a first diffusion tube with the diameter gradually increased and then is subjected to turbulent mixing, and then the mixed liquid of the cement-based slurry and the liquid additive is further sheared and mixed through a first homogenizer;
s4, the nitrogen generating device opens the electric valve to provide nitrogen to inject from a second nozzle in a second mixing cavity to form high-pressure jet flow, negative pressure is formed in the second mixing cavity, under the action of the negative pressure, the mixed liquid of the cement-based slurry and the liquid additive mixed by the primary mixer is sucked into the second mixing cavity from the suction inlet of the secondary mixer, and then is sheared at high speed by the high-pressure nitrogen injected from the second nozzle to play a role of mixing;
and S5, passing the mixed liquid mixed with the nitrogen, the liquid additive and the cement-based slurry through a second diffusion pipe with the gradually enlarged drift diameter, further generating turbulent flow mixing, passing the mixed liquid mixed with the nitrogen, the liquid additive and the cement-based slurry through a second homogenizer, and further shearing and mixing to form the foamed cement slurry with stable and uniform density.
The invention provides a foam generating device for oil drilling and production well cementation operation and a foaming method thereof, wherein the device mainly adopts a Venturi jet mixing principle, a turbulent mixing principle and a shearing mixing principle to mix three fluid media of solid, liquid and gas to form foam cement slurry with stable density and uniform mixing, and the foam generating device has the beneficial effects that:
1. the invention adopts a structure that the nozzle can be quickly disassembled and assembled, and is suitable for mixing the foam cement slurry with different densities and flows;
2. the invention adopts the homomixer to shear and mix the medium flowing through again, thus improving the uniformity of the medium;
3. the invention adopts a two-stage mixing mode, each stage of mixing comprises the homomixer, the mixed liquid is further sheared and mixed, the mixing is more uniform, the density of the mixed liquid is more stable, the structure is simple, the use is convenient, and the device is suitable for popularization and use.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a view showing the connection structure of parts at various positions of the present invention;
FIG. 3 is a front cross-sectional block diagram of the present invention;
FIG. 4 is a view of the nozzle, mixing chamber and diffuser mounting arrangement of the present invention;
FIG. 5 is a block diagram of the mounting of the homomixer, mixing chamber and diffuser of the present invention;
FIG. 6 is a block diagram of the homomixer of the present invention;
in the figure: a first-stage mixer 1; a secondary mixer 2; a first nozzle 3; a lock nut 301; a first mixing chamber 4; an additive inlet 5; a first diffusion pipe 6; a card holder 7; a bent pipe 8; a second mixing chamber 9; a second diffusion pipe 10; a first homomixer 11; a second homomixer 12; a gland 1201; a stirring blade 1202; a stirring shaft 1203; an outlet 13; a second nozzle 14; a locking ring 15; a cementing truck 16; a liquid adding device 17; a nitrogen generating device 18; a flow meter 19; an electrically operated valve 20; a pressure gauge 21; a snap ring 22.
Detailed Description
Example 1
As shown in figures 1-6, the liquid outlet of a first-stage mixer 1 is communicated with the liquid inlet of a second-stage mixer 2, the liquid inlet of the first-stage mixer 1 is communicated with a pump body of a well cementing truck 16, the first-stage mixer 1 is communicated with a liquid adding device 17, the liquid inlet of the second-stage mixer 2 is communicated with a nitrogen generating device 18, and the first-stage mixer 1 and the second-stage mixer 2 are both provided with a uniform mixer. By the structure, the homogenizing mixer plays a role in further shearing and mixing the mixed liquid, so that the mixing time is greatly prolonged, the mixing is more uniform, and the density of the mixed liquid is more stable.
In the preferred scheme, the structure of the first-stage mixer 1 is as follows: the first mixing cavity 4 is communicated with a first diffusion pipe 6, the first diffusion pipe 6 is communicated through an elbow pipe 8, the elbow pipe 8 is communicated with a first homomixer 11, and the first homomixer 11 is communicated with the second-stage mixer 2. According to the structure, the first-stage mixer 1 and the second-stage mixer 2 are arranged, the discharge port of the first-stage mixer 1 is connected with the suction port of the second-stage mixer 2, during well cementation construction, high-pressure cement-based slurry discharged by a well cementation vehicle 16 and a liquid additive pumped by a liquid adding device are mixed in the first mixing cavity 4 for the first time, and then nitrogen provided by a nitrogen generating device and cement slurry containing the liquid additive mixed by the second mixing cavity 9 are mixed and foamed in the second mixing cavity 9, so that foam cement slurry with stable density is formed.
In a preferred scheme, the structure of the secondary mixer 2 is as follows: the second mixing chamber 9 is communicated with the first homomixer 11, one end of the second mixing chamber 9 is communicated with the nitrogen generating device 18, the other end is communicated with the second diffusion pipe 10, and the second diffusion pipe 10 is communicated with the second homomixer 12. With the structure, the nitrogen provided by the nitrogen generator and the cement slurry containing the liquid additive mixed by the second mixing cavity 9 are mixed and foamed in the second mixing cavity 9, so that the foam cement slurry with stable density is formed.
In the preferred scheme, first mixing chamber 4 one end are equipped with first nozzle 3, first nozzle 3 and the 16 pump bodies of well cementation car intercommunication, first mixing chamber 4 one side is equipped with additive entry 5, and additive entry 5 and liquid add device 17 intercommunication, but structure from this, but first nozzle 3 and second nozzle 14 all adopt quick assembly disassembly structure to carry out the mixing of the foam cement thick liquid of different density, flow.
The high-pressure cement-based slurry discharged by the well cementation vehicle 16 is injected from the first nozzle 3 in the first-stage mixer 1 to form high-pressure jet flow, negative pressure is formed inside the first mixing cavity 4, under the action of the negative pressure, the liquid additive pumped out by the liquid adding device 17 is sucked into the first mixing cavity 4 from the additive inlet 5 of the first mixing cavity 4, then the high-pressure cement-based slurry injected from the first nozzle 3 is sheared at high speed to play a mixing role, then the mixed liquid of the cement-based slurry and the liquid additive passes through the first diffusion pipe 6 with the gradually increased diameter to further generate turbulent mixing, and then the mixed liquid of the cement-based slurry and the liquid additive passes through the first homomixer 11 to be further sheared and mixed.
The first nozzle 3 is locked at the liquid inlet of the first mixing chamber 4 by a plurality of locking nuts 301. According to the structure, a structure capable of being quickly assembled and disassembled is adopted, so that the foam cement paste with different densities and flows can be mixed.
In the preferred scheme, 3 tip of first nozzle stretch into first mixing chamber 4 inside, and the tip is established in additive entry 5 positions, and 3 tip of first nozzle are the toper structure, and this structure, the tip is established and can be made inside formation negative pressure of first mixing chamber 4 in additive entry 5 positions, and is also convenient for liquid additive to flow into 3 opening positions of first nozzle and cut, mix in the toper structure.
The first nozzle 3 jets the cement-based slurry so that the liquid additive is sucked from the additive inlet 5 by negative pressure inside the first mixing chamber 4, and the high-pressure cement-based slurry is mixed with the liquid additive by high-speed shearing.
In the preferred scheme, the inside of the first diffusion pipe 6 is communicated with the first mixing chamber 4 through a thin pipe, the pipe diameter of the pipeline inside the first diffusion pipe 6 is larger as the pipe diameter is farther away from the first mixing chamber 4, the first diffusion pipe 6 is in threaded connection with the first mixing chamber 4, the outside of the first diffusion pipe is clamped through a locking ring 15, and the first diffusion pipe 6 is clamped with the bent pipe 8 or the first uniform mixer 11 through a clamping seat 7. With the structure, the mixed liquid of the cement-based slurry and the liquid additive passes through the first diffusion pipe 6 with the gradually increased diameter to further generate turbulent mixing, and then the mixed liquid of the cement-based slurry and the liquid additive passes through the first homomixer 11 to be further sheared and mixed.
In a preferable scheme, the end part of the first diffusion pipe 6 is in threaded connection with the first mixing chamber 4, the locking ring 15 is in threaded connection with the end part of the first diffusion pipe 6, and the locking ring 15 abuts against the end surface of the first mixing chamber 4. With this structure, the locking ring 15 functions to fix the first diffuser 6 and prevent the first diffuser 6 from coming loose due to resonance.
In the preferred scheme, the end part of the second diffusion pipe 10 is connected with the second uniform mixer 12 in a clamping manner through a clamping seat 7, a clamping ring 22 is arranged at the end part of the second uniform mixer 12, the end part of the clamping ring 22 is abutted against a boss of the second uniform mixer 12 and is in threaded connection with the second uniform mixer 12, the inner part of one end of the clamping seat 7 is clamped on the boss of the clamping ring 22 for limitation, the other end of the clamping seat is in threaded connection with the second diffusion pipe 10, and a sealing gasket is arranged between the second uniform mixer 12 and the second diffusion pipe 10. By the structure, the clamping ring 22 and the clamping seat 7 are matched and locked with the second uniform mixer 12 and the second diffusion tube 10, the connection structure is simple, the disassembly is convenient, and the sealing gasket plays a sealing role.
In the preferred scheme, the first homomixer 11 comprises a cylinder body, a stirring shaft 1203 is arranged in the cylinder body, a plurality of stirring blades 1202 which are spirally distributed are arranged on the periphery of the stirring shaft 1203, glands 1201 are arranged at two ends of the cylinder body, the stirring shaft 1203 is rotatably connected with the glands 1201, and a plurality of through holes are formed in the glands 1201. According to the structure, the stirring blade 1202 and the stirring shaft 1203 are welded together, the stirring blade 1202 and the stirring shaft 1203 can rotate selectively along the axial direction, two glands 1201 are respectively arranged at two ends of the pipeline, the two glands 1201 ensure that the stirring shaft 1203 welded with the stirring blade 1202 cannot move along the axial direction, and mixed liquid is continuously sheared by the stirring blade 1202 in the flow homomixer so as to be mixed again.
Example 2
Further described with reference to embodiment 1, as shown in fig. 1 to 6, a pump body of the well cementation vehicle 16 is communicated with a first mixing chamber 4 of an electric valve 20 through a flow meter 19, high-pressure cement-based slurry discharged from the well cementation vehicle 16 after the electric valve 20 is opened is injected from a first nozzle 3 in the first mixing chamber 4 to form high-pressure jet flow, and negative pressure is formed inside the first nozzle 3.
The liquid adding device 17 opens the electric valve 20, and the pumped liquid additive is sucked into the first mixing cavity 4 from the additive inlet 5 of the first mixing cavity 4 under the action of negative pressure, and then is sheared at high speed by the high-pressure cement-based slurry injected from the first mixing cavity 4 to play a mixing role.
The mixed liquid of the cement-based slurry and the liquid additive passes through the first diffusion pipe 6 with the diameter gradually increased to further generate turbulent mixing, and then the mixed liquid of the cement-based slurry and the liquid additive passes through the first homomixer 11 to be further sheared and mixed.
The nitrogen generating device 18 opens the electric valve 20, provides nitrogen to be injected from the second nozzle 14 in the second mixing chamber 9 to form high-pressure jet flow, forms negative pressure in the second mixing chamber 9, and under the action of the negative pressure, the mixed liquid of the cement-based slurry and the liquid additive mixed by the primary mixer 1 is sucked into the second mixing chamber 9 from the suction inlet of the secondary mixer 2, and then is sheared at high speed by the high-pressure nitrogen injected from the second nozzle 14 to play a role in mixing.
Then the mixed liquid of the liquid additive and the cement-based slurry mixed with the nitrogen passes through the second diffusion pipe 10 with the diameter gradually enlarged to generate turbulent mixing, and then the mixed liquid of the liquid additive and the cement-based slurry mixed with the nitrogen passes through the second homomixer 12 to be further sheared and mixed, so that the foam cement slurry with stable and uniform density is formed.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. A foam generating device for petroleum drilling and well cementation operation is characterized in that: the liquid outlet of the first-stage mixer (1) is communicated with the liquid inlet of the second-stage mixer (2), the liquid inlet of the first-stage mixer (1) is communicated with the pump body of the well cementing truck (16), the first-stage mixer (1) is communicated with the liquid adding device (17), the liquid inlet of the second-stage mixer (2) is communicated with the nitrogen generating device (18), and the first-stage mixer (1) and the second-stage mixer (2) are both provided with uniform mixers.
2. The foam generating device for oil drilling and cementing operation as claimed in claim 1, wherein: the structure of the first-stage mixer (1) is as follows: the first mixing cavity (4) is communicated with the first diffusion pipe (6), the first diffusion pipe (6) is communicated through the bent pipe (8), the bent pipe (8) is communicated with the first uniform mixer (11), and the first uniform mixer (11) is communicated with the second-stage mixer (2).
3. The foam generating device for oil drilling and cementing operation as claimed in claim 2, wherein: the structure of the second-stage mixer (2) is as follows: the second mixing cavity (9) is communicated with the first homomixer (11), one end of the second mixing cavity (9) is communicated with the nitrogen generating device (18), the other end of the second mixing cavity is communicated with the second diffusion pipe (10), and the second diffusion pipe (10) is communicated with the second homomixer (12).
4. The foam generating device for oil drilling and cementing operation as claimed in claim 2, wherein: the device comprises a first mixing cavity (4), wherein one end of the first mixing cavity (4) is provided with a first nozzle (3), the first nozzle (3) is communicated with a pump body of a well cementation vehicle (16), one side of the first mixing cavity (4) is provided with an additive inlet (5), and the additive inlet (5) is communicated with a liquid adding device (17);
the first nozzle (3) is locked at the liquid inlet of the first mixing cavity (4) through a plurality of locking nuts (301).
5. The foam generating device for oil drilling and cementing operation as claimed in claim 4, wherein: the end part of the first nozzle (3) extends into the first mixing cavity (4), the end part is arranged at the position of the additive inlet (5), and the end part of the first nozzle (3) is of a conical structure;
the first nozzle (3) sprays cement-based slurry, so that the liquid additive is sucked from the additive inlet (5) under the negative pressure inside the first mixing cavity (4), and the high-pressure cement-based slurry is mixed with the liquid additive in a high-speed shearing manner.
6. The foam generating device for oil drilling and cementing operation as claimed in claim 2, wherein: the inner part of the first diffusion pipe (6) is communicated with the first mixing cavity (4) through a thin pipe, the pipe diameter of the pipeline in the first diffusion pipe (6) is larger as the pipe diameter is farther away from the first mixing cavity (4), the first diffusion pipe (6) is in threaded connection with the first mixing cavity (4), and the outer part of the first diffusion pipe is clamped through a locking ring (15);
the first diffusion pipe (6) is clamped with the bent pipe (8) or the first uniform mixer (11) through a clamping seat (7).
7. The foam generating device for oil drilling and cementing operation as claimed in claim 6, wherein: the end part of the first diffusion pipe (6) is in threaded connection with the first mixing cavity (4), the locking ring (15) is in threaded connection with the end part of the first diffusion pipe (6), and the locking ring (15) abuts against the end face of the first mixing cavity (4).
8. The foam generating device for oil drilling and cementing operation as claimed in claim 3, wherein: the end part of the second diffusion pipe (10) is clamped with the second uniform mixer (12) through a clamping seat (7);
the end part of the second uniform mixer (12) is provided with a clamping ring (22), the end part of the clamping ring (22) is abutted against a boss of the second uniform mixer (12) and is in threaded connection with the second uniform mixer (12), the inner part of one end of the clamping seat (7) is clamped on the boss of the clamping ring (22) for limitation, the other end of the clamping seat is in threaded connection with the second diffusion tube (10), and a sealing gasket is arranged between the second uniform mixer (12) and the second diffusion tube (10).
9. The foam generating device for oil drilling and cementing operation as claimed in claim 2, wherein: the first homomixer (11) comprises a cylinder body, wherein a stirring shaft (1203) is arranged inside the cylinder body, a plurality of stirring blades (1202) which are spirally distributed are arranged on the periphery of the stirring shaft (1203), glands (1201) are arranged at two ends of the cylinder body, the stirring shaft (1203) is rotatably connected with the glands (1201), and a plurality of through holes are formed in the glands (1201).
10. The foaming method of the foam generating device for oil drilling and well cementation operation according to any one of claims 1 to 9, characterized in that:
the method comprises the following steps:
s1, a pump body of the well cementation vehicle (16) is communicated with a first mixing cavity (4) of an electric valve (20) through a flow meter (19), high-pressure cement-based slurry discharged by the well cementation vehicle (16) of the electric valve (20) is started to be injected from a first nozzle (3) in the first mixing cavity (4) to form high-pressure jet flow, and negative pressure is formed inside the first nozzle (3);
s2, the electric valve (20) is opened by the liquid adding device (17), the pumped liquid additive is sucked into the first mixing cavity (4) from the additive inlet (5) of the first mixing cavity (4) under the action of negative pressure, and then the pumped liquid additive is sheared at high speed by the high-pressure cement-based slurry injected from the first mixing cavity (4) to play a role in mixing;
s3, the mixed liquid of the cement-based slurry and the liquid additive passes through the first diffusion pipe (6) with the diameter gradually increased and then is subjected to turbulent mixing, and then the mixed liquid of the cement-based slurry and the liquid additive is further sheared and mixed through the first homomixer (11);
s4, the nitrogen generating device (18) opens the electric valve (20), nitrogen is provided to be injected from a second nozzle (14) in the second mixing cavity (9) to form high-pressure jet flow, negative pressure is formed in the second mixing cavity (9), under the action of the negative pressure, the mixed liquid of the cement-based slurry and the liquid additive mixed by the first-stage mixer (1) is sucked into the second mixing cavity (9) from the suction inlet of the second-stage mixer (2), and then is sheared at high speed by the high-pressure nitrogen injected from the second nozzle (14) to play a role in mixing;
s5, the mixed liquid of the liquid additive and the cement-based slurry mixed with the nitrogen further generates turbulent flow mixing after passing through a second diffusion pipe (10) with the diameter gradually increased, and the mixed liquid of the liquid additive and the cement-based slurry mixed with the nitrogen further is sheared and mixed through a second homogenizer (12), so that the foamed cement slurry with stable and uniform density is formed.
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| CN112791657A (en) * | 2021-04-08 | 2021-05-14 | 山东华通环境科技股份有限公司 | High-efficient muddy water mixing arrangement |
| CN113083161A (en) * | 2021-04-09 | 2021-07-09 | 华东理工大学 | Jet type foam generating device for removing peculiar smell substances |
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