CN111888960B - Foam generating device and foam generating method for petroleum drilling and cementing operation - Google Patents
Foam generating device and foam generating method for petroleum drilling and cementing operation Download PDFInfo
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- CN111888960B CN111888960B CN202010746413.XA CN202010746413A CN111888960B CN 111888960 B CN111888960 B CN 111888960B CN 202010746413 A CN202010746413 A CN 202010746413A CN 111888960 B CN111888960 B CN 111888960B
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- 239000006260 foam Substances 0.000 title claims abstract description 51
- 238000005553 drilling Methods 0.000 title claims abstract description 12
- 239000003208 petroleum Substances 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 122
- 239000007788 liquid Substances 0.000 claims abstract description 90
- 239000004568 cement Substances 0.000 claims abstract description 67
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000002002 slurry Substances 0.000 claims abstract description 59
- 238000009792 diffusion process Methods 0.000 claims abstract description 57
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- 238000005187 foaming Methods 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 239000000654 additive Substances 0.000 claims description 53
- 230000000996 additive effect Effects 0.000 claims description 53
- 238000003756 stirring Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 210000004907 gland Anatomy 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a foam generating device for petroleum drilling and cementing operation and a foaming method thereof, wherein a liquid outlet of a primary mixer is communicated with a liquid inlet of a secondary mixer, the liquid inlet of the primary mixer is communicated with a pump body of a cementing truck, the primary mixer is communicated with a liquid adding device, the liquid inlet of the secondary mixer is communicated with a nitrogen generating device, and both the primary mixer and the secondary mixer are provided with a uniform mixer, and the primary mixer has the following structure: the first mixing cavity is communicated with the first diffusion pipe, the first diffusion pipe is communicated with the first homomixer through the bent pipe, the first homomixer is communicated with the second-stage mixer, and three fluid phase media of solid state, liquid state and gas state are mixed by adopting a Venturi jet mixing principle, a turbulent mixing principle and a shearing mixing principle, so that foam cement slurry with stable density and uniform mixing is formed.
Description
Technical Field
The invention relates to the field of petroleum drilling and well cementation operation equipment, in particular to a foam generating device and a foam generating method thereof, which are suitable for low-density well cementation operation.
Background
Along with the continuous increase of shale gas development, the current well cementation operation has the characteristics of horizontal section and inclined well section length, the problems of eccentric sleeve, low pressure and easy leakage are increasingly outstanding, and higher requirements are put forward on low-density cement paste 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 casing pipe eccentricity and the like, and is popularized and applied abroad.
Foam cement slurry cementing systems from the companies harributon, 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 domestic situation is relatively backward in this aspect, and reliable foam slurry mixing equipment is lacked. The foam generating device is a core component of foam cementing.
Chinese patent CN 105418155A "foam generator for foam cement slurry cementing" discloses a foam generator for foam cement slurry cementing comprising a cement slurry injection assembly having a feed inlet along the axial direction; the nitrogen injection assembly comprises a radial air inlet and a premixing cavity which is communicated with the air inlet and the feeding hole and is arranged along the axial direction; a homogenizer assembly. Wherein, be provided with the air cylinder that includes sonic nozzle on the inner wall of premixing chamber. The shaft body of the structure of the homogenizer component is relatively large, so that the trafficability of the whole foaming structure is poor, the cement slurry is mixed with the nitrogen after being mixed with the additive outside, and the mixing equipment is dispersed and has poor trafficability.
Chinese patent CN 109397538A "a foam cement slurry generator and a cement slurry pressurized air charging device and application thereof" provides a foam generator that can be used to prepare foam cement slurry for oil and gas well cementing, and a cement slurry pressurized air charging device based on the foam generator and application thereof. The distance between this structure mixing chamber and the spiral group piece is less, and the known mixing chamber of figure is the same cavity with the spiral group, and the nitrogen gas of high pressure is direct with foam cement thick liquid blow off, leads to foam cement thick liquid unable entering into the inside cavity of spiral group, and as long as foam cement thick liquid velocity of flow is too big, and the foaming effect is very poor, leads to foam production very poor.
Chinese patent CN 204252939U "a pressure type cementing foam cement generating device" provides a pressure type cementing 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, the mixer is respectively provided with a flow control valve at the two ends of a cement slurry inlet and a nitrogen inlet, a sealing gasket is arranged at the contact part of the mixer and the flow control valve, the reducer union assembly is connected with the mixer by a fan-shaped retainer ring, a wing nut and a spring retainer ring, and a mixed liquid discharge port is communicated with the foam mixing chamber through the reducer union assembly. Without the mixing device, the mixing effect is basically mixed by pressure, resulting in the situation that cement foam is ejected by the pile.
Disclosure of Invention
The invention mainly aims to provide a foam generating device and a foam generating method for petroleum drilling and cementing operation, which solve the problems of unstable foam cement slurry density and uneven bubble distribution during foam cementing operation.
In order to solve the technical problems, the invention adopts the following technical scheme: a foam generating device for oil drilling and well cementation operation is characterized in that a liquid outlet of a primary mixer is communicated with a liquid inlet of a secondary mixer, the liquid inlet of the primary mixer is communicated with a pump body of a well cementation vehicle, the primary mixer is communicated with a liquid adding device, the liquid inlet of the secondary mixer is communicated with a nitrogen generating device, and uniform mixers are arranged on the primary mixer and the secondary mixer.
In a preferred scheme, the primary mixer structure is: the first mixing cavity is communicated with the first diffusion pipe, the first diffusion pipe is communicated with the first uniform mixer through the bent pipe, and the first uniform mixer is communicated with the second-stage mixer.
In a preferred scheme, the secondary mixer structure is: the second mixing cavity is communicated with the first homomixer, one end of the second mixing cavity is communicated with the nitrogen generating device, the other end of the second mixing cavity is communicated with the second diffusion pipe, and the second diffusion pipe is communicated with the second homomixer.
In the preferred scheme, a first mixing cavity is arranged at one end of the first mixing cavity, the first nozzle is communicated with a well cementation vehicle pump body, an additive inlet is arranged at one side of the first mixing cavity, 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 a preferred scheme, the end part of the first nozzle extends into the first mixing cavity, the end part of the first nozzle is arranged at the position of the additive inlet, and the end part of the first nozzle is in a conical structure;
the first nozzle jets cement-based slurry so that negative pressure is generated inside the first mixing cavity to suck the liquid additive from the additive inlet, and the high-pressure cement-based slurry shears the liquid additive at a high speed for mixing.
In the preferred scheme, the inside of a first diffusion pipe is communicated with a first mixing cavity through a thin pipe, the pipe diameter of the pipe inside the first diffusion pipe is larger as the pipe diameter of the pipe inside the first diffusion pipe is far away from the pipe diameter of 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 and connected through a locking ring;
the first diffusion pipe is clamped with the bent pipe or the first homomixer through the clamping seat.
In the preferred scheme, first diffusion pipe tip and first mixing chamber threaded connection, locking ring and first diffusion pipe tip threaded connection, locking ring support on the first mixing chamber terminal surface.
In the preferred scheme, the end part of the second diffusion pipe is clamped with the second homomixer 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 propped against a boss of the second uniform mixer and is in threaded connection with the second uniform mixer, one end of the clamping seat is internally clamped on the boss of the clamping ring to limit, the other end of the clamping seat is in threaded connection with the 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 homomixer comprises a barrel, a stirring shaft is arranged in the barrel, a plurality of stirring blades which are spirally distributed are arranged on the circumference of the stirring shaft, pressing covers are arranged at two ends of the barrel, the stirring shaft is rotationally connected with the pressing covers, and a plurality of through holes are formed in the pressing covers.
The method comprises the following steps:
s1, a cementing truck pump body is communicated with a first mixing cavity of an electric valve through a flowmeter, the electric valve is opened, high-pressure cement-based slurry discharged by the cementing truck is injected from a first nozzle in the first mixing cavity to form high-pressure jet flow, and negative pressure is formed in the first nozzle;
S2, the liquid adding device opens an electric valve, and under the action of negative pressure, pumped liquid additive is sucked into the first mixing cavity from an additive inlet of the first mixing cavity and then sheared at a high speed by high-pressure cement-based slurry injected from the first mixing cavity, so that the mixing effect is achieved;
S3, the mixed liquid of the cement-based slurry and the liquid additive is subjected to turbulent mixing after passing through a first diffusion pipe with continuously enlarged path, and then the mixed liquid of the cement-based slurry and the liquid additive is further sheared and mixed by a first homomixer;
s4, the nitrogen generating device opens an electric valve to provide nitrogen to be injected from a second nozzle in the second mixing cavity to form high-pressure jet flow, negative pressure is formed in the second mixing cavity, and under the action of the negative pressure, the cement-based slurry and liquid additive mixed solution mixed by the primary mixer is sucked into the second mixing cavity from a suction inlet of the secondary mixer and then sheared at a high speed by the high-pressure nitrogen injected from the second nozzle to play a role in mixing;
S5, the mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through a second diffusion pipe with continuously enlarged path and then is further mixed in a turbulent way, and the mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through a second homomixer and is further sheared and mixed, so that foam cement slurry with stable and uniform density is formed.
The invention provides a foam generating device for petroleum drilling and cementing operation and a foaming method thereof, wherein the device mainly adopts a Venturi jet mixing principle, a turbulent flow mixing principle and a shearing mixing principle to mix three fluid phase media of solid, liquid and gas so as to form foam cement slurry with stable density and uniform mixing, and the invention 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 foam cement slurries with different densities and flow rates;
2. The invention adopts the homomixer to shear and mix the flowing medium again, thereby improving the uniformity of the medium;
3. the invention adopts a two-stage mixing mode, and each stage of mixing comprises a homomixer, so that the mixed liquid is further sheared and mixed, the more uniform mixing, the more stable density of the mixed liquid are ensured, the structure is simple, the use is convenient, and the invention 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 diagram of the connection structure of the parts of the present invention;
FIG. 3 is a front cross-sectional view of the structure of the present invention;
FIG. 4 is a block diagram of the nozzle, mixing chamber and diffuser installation of the present invention;
FIG. 5 is a block diagram of the mounting of the homomixer, mixing chamber and diffuser in accordance with the present invention;
FIG. 6 is a block diagram of a homomixer of the present invention;
In the figure: a primary 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 tube 6; a clamping seat 7; a bent pipe 8; a second mixing chamber 9; a second diffusion tube 10; a first homomixer 11; a second homomixer 12; a gland 1201; stirring blade 1202; a stirring shaft 1203; a discharge port 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 clasp 22.
Detailed Description
Example 1
As shown in fig. 1-6, a liquid outlet of a primary mixer 1 is communicated with a liquid inlet of a secondary mixer 2, the liquid inlet of the primary mixer 1 is communicated with a pump body of a well cementation vehicle 16, the primary mixer 1 is communicated with a liquid adding device 17, the liquid inlet of the secondary mixer 2 is communicated with a nitrogen generating device 18, and uniform mixers are arranged on the primary mixer 1 and the secondary mixer 2. With the structure, the homomixer plays a role in further shearing and mixing the mixed liquid, so that the mixing time is greatly prolonged, and more uniform mixing and more stable density of the mixed liquid are ensured.
In a preferred embodiment, the primary mixer 1 is configured as follows: the first mixing cavity 4 is communicated with the first diffusion pipe 6, the first diffusion pipe 6 is communicated with the first homomixer 11 through the bent pipe 8, and the first homomixer 11 is communicated with the second-stage mixer 2. According to the structure, the primary mixer 1 and the secondary mixer 2 are connected, the discharge outlet of the primary mixer 1 is connected with the suction inlet of the secondary mixer 2, during well cementation construction, the high-pressure cement-based slurry discharged by the well cementation vehicle 16 and the liquid additive are pumped by the liquid additive pumping device to be mixed once in the first mixing cavity 4, and then nitrogen provided by the 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 embodiment, the secondary mixer 2 is configured to: 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 of the second mixing chamber 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 generating device 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 is equipped with first nozzle 3, and first nozzle 3 and the pump body of well cementation car 16 are linked together, first mixing chamber 4 one side is equipped with additive entry 5, and additive entry 5 and liquid add device 17 intercommunication, from this structure, but first nozzle 3 and second nozzle 14 all adopt quick assembly disassembly structure to carry out the blending of the foam cement thick liquid of different density, flow.
The high-pressure cement-based slurry discharged from the cementing truck 16 is injected from the first nozzle 3 in the primary mixer 1 to form high-pressure jet flow, negative pressure is formed in the first mixing cavity 4, under the action of the negative pressure, the liquid additive pumped 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 a high speed to play a role in mixing, then the cement-based slurry and the liquid additive mixed liquid pass through the first diffusion pipe 6 with continuously enlarged path to further generate turbulent mixing, and then the cement-based slurry and the liquid additive mixed liquid flow through the first homomixer 11 to be sheared and mixed further.
The first nozzle 3 is locked at the liquid inlet of the first mixing cavity 4 through a plurality of locking nuts 301. Therefore, the structure is quickly assembled and disassembled, so that foam cement slurries with different densities and flow rates are mixed.
In the preferred scheme, the tip of first nozzle 3 stretches into inside first mixing chamber 4, and the tip is established in additive entry 5 position, and first nozzle 3 tip is the toper structure, and from this structure, the tip is established in additive entry 5 position and can be made the inside negative pressure that forms of first mixing chamber 4, and is the toper structure and also makes things convenient for liquid additive to flow into first nozzle 3 open position and cut, mix.
The first nozzle 3 jets cement-based slurry such that negative pressure is drawn into the liquid additive from the additive inlet 5 inside the first mixing chamber 4 and the high pressure cement-based slurry shears the liquid additive at a high speed.
In the preferred scheme, the inside of the first diffusion tube 6 is communicated with the first mixing cavity 4 through a thin tube, the pipe diameter of the inner pipeline of the first diffusion tube 6 is larger when being far away from the pipe diameter of the first mixing cavity 4, the first diffusion tube 6 is in threaded connection with the first mixing cavity 4, the outside is clamped through a locking ring 15, and the first diffusion tube 6 is clamped with an elbow 8 or a first homomixer 11 through a clamping seat 7. With this structure, the cement-based slurry and the liquid additive mixture passes through the first diffuser pipe 6 having a continuously enlarged passage to further generate turbulent mixing, and then the cement-based slurry and the liquid additive mixture pass through the first homomixer 11 to be further sheared and mixed.
In a preferred embodiment, the end of the first diffusion tube 6 is screwed with the first mixing chamber 4, the locking ring 15 is screwed with the end of the first diffusion tube 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 diffusion tube 6, preventing the first diffusion tube 6 from falling off in resonance.
In the preferred scheme, second diffusion pipe 10 tip passes through cassette 7 joint with second homomixer 12, second homomixer 12 tip is equipped with snap ring 22, and snap ring 22 tip supports and leans on the boss of second homomixer 12 and with second homomixer 12 threaded connection, the inside card of cassette 7 one end is spacing on the boss of snap ring 22, and the other end and second diffusion pipe 10 threaded connection, establishes sealed pad between second homomixer 12 and the second diffusion pipe 10. With the structure, the clamping ring 22 and the clamping seat 7 are matched and locked with the second homomixer 12 and the second diffusion tube 10, the connecting structure is simple, the disassembly is convenient, and the sealing gasket plays a sealing role.
In the preferred scheme, the first homomixer 11 includes the barrel, and the barrel is inside to be equipped with the (mixing) shaft 1203, and (mixing) shaft 1203 border is equipped with a plurality of helical distribution's stirring vane 1202, and the barrel both ends are equipped with gland 1201, and (mixing) shaft 1203 is connected with gland 1201 rotation, is equipped with a plurality of through-holes on the gland 1201. In this structure, the stirring vane 1202 and the stirring shaft 1203 are welded together, the stirring vane 1202 and the stirring shaft 1203 are optionally rotated along the axial direction, two pressing covers 1201 are respectively arranged at two ends of the pipeline, the two pressing covers 1201 ensure that the stirring shaft 1203 welded with the stirring vane 1202 cannot move along the axial direction, and the mixed liquid is continuously sheared by the stirring vane 1202 in the mixer after flowing through the mixer, so that the mixed liquid is mixed again.
Example 2
Further describing in connection with the embodiment 1, as shown in fig. 1-6, the pump body of the cementing truck 16 is communicated with the first mixing cavity 4 of the electric valve 20 through the flow meter 19, the electric valve 20 is opened, high-pressure cement-based slurry discharged by the cementing truck 16 is injected from the 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.
The liquid adding device 17 opens the electric valve 20, and under the action of negative pressure, the pumped liquid additive is sucked into the first mixing cavity 4 from the additive inlet 5 of the first mixing cavity 4, and then sheared at high speed by the high-pressure cement-based slurry injected from the first mixing cavity 4, so as to play a role in mixing.
The cement-based slurry and the liquid additive mixture are further turbulently mixed after passing through the first diffusion pipe 6 with continuously enlarged path, and then the cement-based slurry and the liquid additive mixture flow is further sheared and mixed by passing through the first homomixer 11.
The nitrogen generating device 18 opens the electric valve 20 to provide nitrogen to be injected from the 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, and under the action of the negative pressure, the cement-based slurry and liquid additive mixed solution mixed by the primary mixer 1 is sucked into the second mixing cavity 9 from the suction inlet of the secondary mixer 2, and then is sheared at a high speed by the high-pressure nitrogen injected from the second nozzle 14 to play a role in mixing.
The mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through the second diffusion pipe 10 with continuously enlarged path to further generate turbulent mixing, and then the mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through the second homomixer 12 to be further sheared and mixed, so that foam cement slurry with stable and uniform density is formed.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (5)
1. A foam generating device for petroleum drilling and cementing operation is characterized in that: the liquid outlet of the primary mixer (1) is communicated with the liquid inlet of the secondary mixer (2), the liquid inlet of the primary mixer (1) is communicated with the pump body of the well cementation vehicle (16), the primary mixer (1) is communicated with the liquid adding device (17), the liquid inlet of the secondary mixer (2) is communicated with the nitrogen generating device (18), and the primary mixer (1) and the secondary mixer (2) are both provided with homomixers;
The primary mixer (1) has the structure that: the first mixing cavity (4) is communicated with the first diffusion pipe (6), the first diffusion pipe (6) is communicated with the first homomixer (11) through the bent pipe (8), and the first homomixer (11) is communicated with the second-stage mixer (2);
the structure of the secondary 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);
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);
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 in a conical structure;
The first nozzle (3) jets cement-based slurry, so that negative pressure is adopted inside the first mixing cavity (4) to suck the liquid additive from the additive inlet (5), and the high-pressure cement-based slurry is mixed with the liquid additive in a high-speed shearing mode;
the second homomixer (12) comprises a barrel, a stirring shaft (1203) is arranged inside the barrel, a plurality of stirring blades (1202) which are spirally distributed are arranged on the circumference of the stirring shaft (1203), pressing covers (1201) are arranged at two ends of the barrel, the stirring shaft (1203) is rotationally connected with the pressing covers (1201), and a plurality of through holes are formed in the pressing covers (1201).
2. The foam generating device for petroleum drilling and cementing operation according to claim 1, which is characterized in that: the inside of the first diffusion tube (6) is communicated with the first mixing cavity (4) through a thin tube, the pipe diameter of the inner pipeline of the first diffusion tube (6) is larger as the pipe diameter of the inner pipeline of the first diffusion tube is far away from the first mixing cavity (4), the first diffusion tube (6) is in threaded connection with the first mixing cavity (4), and the outside of the first diffusion tube is clamped and connected through a locking ring (15);
The first diffusion pipe (6) is clamped with the bent pipe (8) or the first homomixer (11) through the clamping seat (7).
3. The foam generating device for petroleum drilling and cementing operation according to claim 2, which is characterized in that: the end of the first diffusion tube (6) is in threaded connection with the first mixing cavity (4), the locking ring (15) is in threaded connection with the end of the first diffusion tube (6), and the locking ring (15) abuts against the end face of the first mixing cavity (4).
4. The foam generating device for petroleum drilling and cementing operation according to claim 1, which is characterized in that: the end part of the second diffusion pipe (10) is clamped with the second homomixer (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 propped against a boss of the second uniform mixer (12) and is in threaded connection with the second uniform mixer (12), one end of the clamping seat (7) is internally clamped on the boss of the clamping ring (22) to limit, 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).
5. The foaming method of the foam generating device for petroleum drilling and cementing operation according to any one of claims 1 to 4, which is characterized by comprising the following steps:
The method comprises the following steps:
s1, a pump body of a well cementing truck (16) is communicated with a first mixing cavity (4) of an electric valve (20) through a flowmeter (19), the electric valve (20) is opened, high-pressure cement-based slurry discharged by the well cementing truck (16) is 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, a valve is opened by a liquid adding device (17), and pumped liquid additive is sucked into the first mixing cavity (4) from an additive inlet (5) of the first mixing cavity (4) under the action of negative pressure and is sheared at a high speed by 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 is subjected to turbulent mixing through a first diffusion pipe (6) with continuously enlarged path, and then the mixed liquid of the cement-based slurry and the liquid additive is further sheared and mixed through a first homomixer (11);
s4, the nitrogen generating device (18) opens an electric valve (20) to provide nitrogen gas 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), and under the action of the negative pressure, the cement-based slurry and liquid additive mixed solution mixed by the primary mixer (1) is sucked into the second mixing cavity (9) from a suction inlet of the secondary mixer (2) and then sheared at a high speed by the high-pressure nitrogen gas injected from the second nozzle (14) to play a role in mixing;
S5, the mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through a second diffusion pipe (10) with continuously enlarged path to be further mixed in a turbulent way, and then the mixed liquid mixed with nitrogen, the liquid additive and the cement-based slurry passes through a second homomixer (12) to be further sheared and mixed, so that foam cement slurry with stable and uniform density is formed.
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| CN109397538A (en) * | 2017-08-16 | 2019-03-01 | 中国石油化工股份有限公司 | A kind of foam slurry generator and cement slurry air charging system with pressure and its application |
| CN212348372U (en) * | 2020-07-29 | 2021-01-15 | 中石化四机石油机械有限公司 | Foam generating device for petroleum drilling and well cementation operation |
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| CN103861511B (en) * | 2014-02-19 | 2015-09-02 | 中国矿业大学 | The spiral foam-making apparatus of a kind of mining porous |
| CN204252939U (en) * | 2014-11-03 | 2015-04-08 | 中石化石油工程机械有限公司第四机械厂 | A kind of pressure type well cementation foamed cement generating means |
| CN205627687U (en) * | 2016-05-09 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | Vacuum is penetrated and is inhaled blender |
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| US5393341A (en) * | 1991-06-06 | 1995-02-28 | Rume Maschinenbau Gmbh | Method and apparatus for the production of structural foam, particularly cement foam |
| CN109397538A (en) * | 2017-08-16 | 2019-03-01 | 中国石油化工股份有限公司 | A kind of foam slurry generator and cement slurry air charging system with pressure and its application |
| CN212348372U (en) * | 2020-07-29 | 2021-01-15 | 中石化四机石油机械有限公司 | Foam generating device for petroleum drilling and well cementation operation |
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