CN111760478A - Opposite-impact type foam generating device and foam generating method - Google Patents
Opposite-impact type foam generating device and foam generating method Download PDFInfo
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- CN111760478A CN111760478A CN202010721566.9A CN202010721566A CN111760478A CN 111760478 A CN111760478 A CN 111760478A CN 202010721566 A CN202010721566 A CN 202010721566A CN 111760478 A CN111760478 A CN 111760478A
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- 239000006260 foam Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000004080 punching Methods 0.000 claims abstract description 249
- 238000011010 flushing procedure Methods 0.000 claims abstract description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000004088 foaming agent Substances 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 55
- 239000012530 fluid Substances 0.000 claims description 47
- 238000002156 mixing Methods 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 38
- 239000011148 porous material Substances 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 239000012071 phase Substances 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000005187 foaming Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
-
- 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
- B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
- B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
- B01F25/31112—Devices specially adapted for generating foam, e.g. air foam with additional mixing means other than injector mixers, e.g. screen or baffles
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention discloses a hedging type foam generating device and a foam generating method, which comprise a hedging pipe (1), a collecting pipe (2), a staggered punching pipe (5), a sieve hole pipe (7) and a positive punching pipe (10), the pipe wall of the opposite inlet pipe (1) is communicated with the input end of the collecting pipe (2), the two axial ends of the inlet pipe (1) are respectively provided with a nitrogen filling port and a foaming agent filling port, the output end of the collecting pipe (2) is connected with the input end of the staggered flushing pipe (5), the output end of the staggered flushing pipe (5) is connected with the input end of the sieve hole pipe (7), the output end of the sieve hole pipe (7) is connected with the input end of the positive flushing pipe (10), the staggered punching pipe (5) and the positive punching pipe (10) are both of two-stage radial opposite punching hole structures, the hole axes of the two radial opposite punched holes of the staggered punching pipe (5) are staggered, and the hole axes of the two radial opposite punched holes of the positive punching pipe (10) are superposed.
Description
Technical Field
The invention belongs to the technical field of yield increasing transformation of oil and gas wells, in particular relates to a foam generating device for increasing the yield of an oil well by nitrogen foam water shutoff, and particularly relates to a hedging type foam generating device and a foam generating method.
Background
The foam has wide application in the field of oil and gas well development, and can be used for low-pressure drilling, fracturing drainage assistance, energy-increasing oil displacement, water shutoff and profile control and the like. The effectiveness of the application of the foam depends mainly on the foam quality, i.e. the abundance and stability of the foam. The abundance and stability of the foam depend on the one hand on the quality of the blowing agent and on the other hand on the foaming function of the foam-generating device. The existing foam generators are mainly of the type of screw (impeller), curved path (winding plate), screen (sieve mesh) and so on, which are also combined with venturi tubes. The foaming principle is that gas and foaming agent are fully mixed, and rich and stable foam is generated under the action of violent collision and turbulence. Therefore, the main function to be achieved by the foam generating device is to increase the degree of mixing uniformity and turbulence as much as possible. Through finite element simulation, the gas-liquid two-phase fluid basically advances in parallel when advancing along the channels of the spiral (impeller), the curved path (winding plate), the screen (screen hole) and the like, and the effects of mutual staggering and turbulent flow are not obvious in the existing structures of the spiral (impeller), the curved path (winding plate), the screen (screen hole) and the like. Although the cavitation and turbulence effects of the Venturi tube are obvious, the Venturi tube only has single-beam fluid turbulence, the mixing and turbulence effects are insufficient, in addition, the Venturi tube is the only fluid channel, the flow resistance is very large, and the mixed discharge capacity cannot meet the requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a hedging type foam generating device and a foam generating method, and overcomes the defects that in the prior art, the total weight of the device is 1: in the existing structures such as a spiral (impeller), a curved path (winding plate), a screen (screen hole) and the like, when a gas-liquid two-phase fluid advances along the flow channels such as the spiral (impeller), the curved path (winding plate), the screen (screen hole) and the like, the fluid basically advances in parallel, and the fluid is staggered with each other and has no obvious turbulent flow effect; 2: although the cavitation and turbulence effects of the Venturi tube are obvious, the Venturi tube is only disturbed by a single beam of fluid, and the mixing and turbulence effects are insufficient; 3: the Venturi throat is the only fluid channel, the flow resistance is very high, the mixed discharge capacity cannot meet the requirement, and the like.
In order to solve the technical problem, the technical scheme of the invention is as follows: the utility model provides a counterpunch formula foam generating device, includes to going into pipe, collector pipe, mistake towards pipe, perforated pipe and positive towards pipe, to going into the input through connection of pipe wall and collector pipe, be nitrogen gas filling opening and foamer filling opening respectively to going into the axial both ends of pipe, the input of mistake towards the pipe is connected to the output of collector pipe, and the input of perforated pipe is connected to the output of mistake towards pipe, and the input of positive towards pipe is connected to the output of perforated pipe, mistake towards pipe and positive towards pipe and be the radial counterpunch pore structure of two-stage, two radial to the hole axis that punches a hole staggers relatively of mistake towards the two radial of mistake towards pipe, two radial to the hole axis coincidence that punches a hole relatively of positive towards pipe.
Preferably, the pipe wall at the middle position in the axial direction of the inlet pipe is vertically welded and communicated with the input end of the collecting pipe, the nitrogen injection port at one end in the axial direction of the inlet pipe is connected with the nitrogen pump truck through a pipeline, and the foaming agent injection port at the other end in the axial direction of the inlet pipe is connected with the foaming agent pump truck through a pipeline.
Preferably, the collecting pipe is formed by connecting two sections of cylindrical pipes in a through manner, an internal thread is arranged on the inner wall of the cylindrical pipe, close to one side of the staggered flushing pipe, of the collecting pipe, the collecting pipe is connected with the staggered flushing pipe through the internal thread, and a sealing ring is arranged at the joint of the collecting pipe and the staggered flushing pipe.
Preferably, the staggered punching cylindrical pipe is formed by connecting four staggered punching cylindrical pipes in a through manner, the four staggered punching cylindrical pipes are a first staggered punching cylindrical pipe, a second staggered punching cylindrical pipe, a third staggered punching cylindrical pipe and a fourth staggered punching cylindrical pipe from left to right, the diameter of each staggered punching cylindrical pipe is gradually increased along the direction far away from the collecting pipe, one end surface, close to the collecting pipe, of the first staggered punching cylindrical pipe is not communicated, one end surface, far away from the collecting pipe, of the first staggered punching cylindrical pipe is communicated with the second staggered punching cylindrical pipe, a plurality of first-level staggered punching holes are radially distributed on the first staggered punching cylindrical pipe, the second staggered punching cylindrical pipe is communicated with the third staggered punching cylindrical pipe, a plurality of second-level staggered punching holes are radially distributed on the second staggered punching cylindrical pipe, an external thread is arranged on the outer wall of the third staggered punching cylindrical pipe, and the external thread of the outer wall of the third staggered punching cylindrical pipe is matched with the internal thread of the collecting pipe, the third-section staggered punching cylindrical pipe is communicated with the fourth-section staggered punching cylindrical pipe, the inner diameter and the outer diameter of the fourth-section staggered punching cylindrical pipe are respectively identical to those of the cylinder manifold close to one side of the staggered punching cylindrical pipe, the inner wall of the fourth-section staggered punching cylindrical pipe close to one side of the sieve hole pipe is provided with internal threads, the fourth-section staggered punching cylindrical pipe of the staggered punching cylindrical pipe is connected with the sieve hole pipe through the internal threads, and a sealing ring is arranged at the joint of the staggered punching cylindrical pipe and the sieve hole pipe.
Preferably, the number of the first-stage staggered punched holes is an even number, the even number of the first-stage staggered punched holes are radially arranged along the circumferential direction of the first-stage staggered punched hole, the hole axes of each group of the radially opposite first-stage staggered punched holes are oppositely deviated by the distance of each half hole diameter, the number of the second-stage staggered punched holes is an even number, the even number of the second-stage staggered punched holes are radially arranged along the circumferential direction of the second-stage staggered punched hole, the hole axes of each group of the radially opposite second-stage staggered punched holes are oppositely deviated by the distance of each half hole diameter, the hole diameter of each second-stage staggered punched hole is larger than that of each first-stage staggered punched hole, and the first-stage staggered punched holes and the second-.
Preferably, the sieve pore pipe is formed by two sections cylinder pipe through connections, and the cylinder pipe diameter that the sieve pore pipe is close to wrong towards pipe one side is little and the outer wall is equipped with the external screw thread, and the external screw thread of sieve pore pipe and the internal thread looks adaptation of wrong towards pipe, the cylinder pipe terminal surface that the sieve pore pipe is close to wrong towards pipe one side is equipped with a plurality of sieve meshes, and the sieve mesh sets up along the axial of sieve pore pipe, the cylinder pipe diameter that the sieve pore pipe kept away from wrong towards pipe one side is big, and the cylinder pipe inner wall that the sieve pore pipe is close to just towards pipe one side is equipped with the internal thread, and the sieve pore pipe passes through the internal thread and just dashes union coupling, and the sieve pore pipe is.
Preferably, the positive punching pipe is formed by connecting four sections of positive punching cylindrical pipes in a through manner, the four sections of positive punching cylindrical pipes are a first section of positive punching cylindrical pipe, a second section of positive punching cylindrical pipe, a third section of positive punching cylindrical pipe and a fourth section of positive punching cylindrical pipe from left to right in sequence, the outer diameters of the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe and the third section of positive punching cylindrical pipe are gradually increased along the direction away from the sieve hole pipe, one end face, close to the sieve hole pipe, of the first section of positive punching cylindrical pipe is not communicated, one end face, far away from the sieve hole pipe, of the first section of positive punching cylindrical pipe is communicated with the second section of positive punching cylindrical pipe, a plurality of first-stage positive punching holes are radially distributed on the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe is communicated with the third section of positive punching cylindrical pipe and has the same inner diameter, a plurality of second-stage positive punching holes are radially distributed on the second section of, the external thread of the outer wall of the third section of the positive punching cylindrical pipe is matched with the internal thread of the sieve hole pipe, the third section of the positive punching cylindrical pipe is communicated with the fourth section of the positive punching cylindrical pipe, the inner diameter of the fourth section of the positive punching cylindrical pipe is the same as that of the third section of the positive punching cylindrical pipe, and the outer diameter of the fourth section of the positive punching cylindrical pipe is gradually reduced along the direction away from the sieve hole pipe.
Preferably, the number of the first-stage positive punched holes is an even number, the even number of the first-stage positive punched holes are radially arranged along the circumferential direction of the first-stage positive punched hole, the axis of each group of the radially opposite first-stage positive punched holes coincides, the number of the second-stage positive punched holes is an even number, the even number of the second-stage positive punched holes are radially arranged along the circumferential direction of the second-stage positive punched hole, the axis of each group of the radially opposite second-stage positive punched holes coincides, the aperture of each second-stage positive punched hole is larger than that of each first-stage positive punched hole, and the first-stage positive punched holes and the second-stage positive punched holes are radially distributed in a.
Preferably, the foam generating method of the opposed foam generating device comprises the following steps:
step 1) respectively connecting a nitrogen injection port and a foaming agent injection port at two ends of an opposite inlet pipe with a nitrogen pump truck and a foaming agent pump truck, respectively pumping a gas phase and a liquid phase from two ends of the opposite inlet pipe in an opposite flushing manner, performing primary collision mixing, and then feeding the mixture into a collecting pipe;
step 2) the gas-liquid mixed fluid entering the collecting pipe flows to the staggered flushing pipe, the gas-liquid mixed fluid on the outer side of the staggered flushing pipe is subjected to radial hedging through the first-stage staggered punching and the second-stage staggered punching to generate a primary dispersing and crushing effect and a circumferential rotational flow mixing effect;
step 3) then the gas-liquid mixed fluid flows to the sieve hole pipe through the staggered flushing pipe, and the gas-liquid mixed fluid passes through sieve holes of the sieve hole pipe to generate a secondary dispersion crushing effect;
step 4), allowing the gas-liquid mixed fluid after the secondary dispersion crushing to flow to the positive flushing pipe, and allowing the gas-liquid mixed fluid outside the positive flushing pipe to pass through the primary positive punching hole and the secondary positive punching hole, and performing radial opposite flushing for the second time to generate a tertiary dispersion crushing effect;
and 5) after three times of dispersion and crushing, forming foam by the gas-liquid mixed fluid, injecting the foam into a shaft of the oil-gas well through an outlet of the positive flushing pipe, and performing foam injection operation.
Compared with the prior art, the invention has the advantages that:
(1) compared with the traditional spiral (impeller), curved path (winding plate), screen mesh (sieve mesh) and other structures, the invention is provided with two pairs of punching holes (staggered punching holes and positive punching holes), which generate symmetrical and uniform radial high-speed collision, the mixing uniformity is high, the collision crushing effect is strong, and the fluid collides with the screen mesh, so that the damage to the pipe body is small; the invention has a plurality of stages of punched holes, and has the effects of small flow resistance, large adaptive displacement and better mixing and turbulence effects compared with a Venturi tube;
(2) the staggered punching pipe and the positive punching pipe are both of two-stage opposite punching hole structures, the two-stage opposite punching holes are distributed in a step mode in the radial direction and staggered in the circumferential direction, so that a density field, a speed field and a stress field of fluid flowing into the outer side and flowing out of the inner side are more balanced, and the mixing and turbulence effects are better;
(3) according to the staggered punching pipe, two hole axes of each group of radially opposite first-stage staggered punching holes or second-stage staggered punching holes are staggered by a distance of half of the hole diameter, so that the whole staggered punching pipe generates a rotational flow effect, and the circumferential mixing effect is improved; the axes of two holes of each group of radially opposite primary positive punched holes or secondary positive punched holes of the positive punching pipe are superposed, so that the collision and crushing effects are stronger, and the uniform mixing and turbulent flow cavitation effects are better;
(4) the staggered impact pipe is mainly uniformly mixed, the positive impact pipe is mainly collided and crushed, the uniform mixing function is realized firstly and then the powerful crushing function is realized according to the mixing and flow disturbing target of the foam generating device, and the staggered impact pipe is arranged in front of the positive impact pipe, so that the mixing and flow disturbing effects are better.
Drawings
FIG. 1 is a schematic structural diagram of an opposed foam generator according to the present invention;
FIG. 2 is a schematic cross-sectional view of a staggered first-stage punch hole of a counter-punch foam generating device of the present invention;
FIG. 3 is a schematic cross-sectional view of a two-stage staggered punching of a counter-punch foam generating device of the present invention;
FIG. 4 is a schematic cross-sectional view of a mesh tube of an opposed type foam generator according to the present invention;
FIG. 5 is a schematic cross-sectional view of a first stage positive punch of an opposed foam generator of the present invention;
FIG. 6 is a schematic cross-sectional view of a two-stage positive punching hole of an opposed-punching type foam generating apparatus according to the present invention.
Description of the reference numerals
1-opposite pipe feeding, 2-collecting pipe, 3-first-level staggered punching, 4-second-level staggered punching, 5-staggered pipe punching, 6-sieve hole, 7-sieve hole pipe, 8-first-level positive punching, 9-second-level positive punching, 10-positive pipe punching and 11-sealing ring.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other elements shown in the specification are included for the purpose of understanding and reading only, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
As shown in fig. 1, the invention discloses a counter-flushing type foam generating device, which comprises a counter-inlet pipe 1, a collecting pipe 2, a staggered-flushing pipe 5, a sieve-hole pipe 7 and a forward-flushing pipe 10, wherein the pipe wall of the counter-inlet pipe 1 is communicated with the input end of the collecting pipe 2, two axial ends of the counter-inlet pipe 1 are respectively provided with a nitrogen injection port and a foaming agent injection port, the output end of the collecting pipe 2 is connected with the input end of the staggered-flushing pipe 5, the output end of the staggered-flushing pipe 5 is connected with the input end of the sieve-hole pipe 7, the output end of the sieve-hole pipe 7 is connected with the input end of the forward-flushing pipe 10, the staggered-flushing pipe 5 and the forward-flushing pipe 10 are both of a two-stage radial counter-flushing structure, two radial counter-flushing holes of the staggered-flushing pipe 5 are staggered in.
Example 2
Preferably, as shown in fig. 1, a pipe wall at an intermediate position in the axial direction of the inlet pipe 1 is vertically welded to and penetrates an input end of the manifold 2, a nitrogen gas injection port at one end in the axial direction of the inlet pipe 1 is connected to a nitrogen gas pump truck through a pipe, and a foaming agent injection port at the other end in the axial direction of the inlet pipe 1 is connected to the foaming agent pump truck through a pipe.
Preferably, as shown in fig. 1, the collecting pipe 2 is formed by connecting two sections of cylindrical pipes in a through manner, an internal thread is arranged on the inner wall of the cylindrical pipe on one side of the collecting pipe 2 close to the staggered flushing pipe 5, the collecting pipe 2 is connected with the staggered flushing pipe 5 through the internal thread, and a sealing ring 11 is arranged at the joint of the collecting pipe 2 and the staggered flushing pipe 5.
Example 3
Preferably, as shown in fig. 1, the staggered punching pipe 5 is formed by connecting four staggered punching cylindrical pipes in a penetrating manner, the four staggered punching cylindrical pipes are a first staggered punching cylindrical pipe, a second staggered punching cylindrical pipe, a third staggered punching cylindrical pipe and a fourth staggered punching cylindrical pipe sequentially from left to right, the diameter of each staggered punching cylindrical pipe gradually increases along the direction away from the collecting pipe 2, one end surface of the first staggered punching cylindrical pipe, which is close to the collecting pipe 2, is not penetrated, one end surface of the first staggered punching cylindrical pipe, which is far away from the collecting pipe 2, is penetrated through the second staggered punching cylindrical pipe, a plurality of first-stage staggered punching holes 3 are radially distributed on the first staggered punching cylindrical pipe, a plurality of second-stage staggered punching holes 4 are radially distributed on the second staggered punching cylindrical pipe, an external thread is arranged on the outer wall of the third staggered punching cylindrical pipe, and the external thread of the third staggered punching cylindrical pipe is matched with the internal thread of the collecting pipe 2, the third-section staggered punching cylindrical pipe is communicated with the fourth-section staggered punching cylindrical pipe, the inner diameter and the outer diameter of the fourth-section staggered punching cylindrical pipe are respectively identical to those of the confluence pipe 2 close to one side of the staggered punching pipe 5, the inner wall of the fourth-section staggered punching cylindrical pipe close to one side of the sieve hole pipe 7 is provided with internal threads, the fourth-section staggered punching cylindrical pipe of the staggered punching pipe 5 is connected with the sieve hole pipe 7 through the internal threads, and a sealing ring 11 is arranged at the joint of the staggered punching pipe 5 and the sieve hole pipe 7.
Preferably, as shown in fig. 2 and 3, the number of the first-stage staggered punched holes 3 is an even number, the even number of the first-stage staggered punched holes 3 are radially arranged along the circumferential direction of the first-stage staggered punched pipe, the hole axes of each group of the radially opposite first-stage staggered punched holes 3 are oppositely offset by a distance of half each hole diameter, the number of the second-stage staggered punched holes 4 is an even number, the even number of the second-stage staggered punched holes 4 are radially arranged along the circumferential direction of the second-stage staggered punched pipe, the hole axes of each group of the radially opposite second-stage staggered punched holes 4 are oppositely offset by a distance of half each hole diameter, the hole diameter of each second-stage staggered punched hole 4 is larger than the hole diameter of each first-stage staggered punched hole 3, and the first-stage staggered punched holes 3 and.
The radial relative two hole axes of punching a hole of every group staggers certain distance, carries out radial offset when gas-liquid mixture fluid through one-level mistake 3 and second grade mistake 4 that punch a hole and punches a hole, produces the crushing effect of once dispersing, produces the whirl and stirs the effect of mixing, improves circumference and stirs the effect of mixing, reaches even mixing and vortex cavitation effect.
When foam generating device rear pressure is big, the liquid mixed fluid can follow second grade mistake and punch 4 outflow, can make fluid density field, speed field, pressure field more balanced, and mixing and vortex effect are better.
Example 4
Preferably, as shown in fig. 1, the sieve hole tube 7 is formed by connecting two sections of cylindrical tubes through, the diameter of the cylindrical tube on one side of the sieve hole tube 7 close to the staggered punching tube 5 is small, the outer wall of the cylindrical tube is provided with an external thread, the external thread of the sieve hole tube 7 is matched with the internal thread of the staggered punching tube 5, the end face of the cylindrical tube on one side of the sieve hole tube 7 close to the staggered punching tube 5 is provided with a plurality of sieve holes 6, the diameter of the cylindrical tube on one side of the sieve hole tube 7 far away from the staggered punching tube 5 is large, the inner wall of the cylindrical tube on one side of the sieve hole tube 7 close to the forward punching tube 10 is provided with an internal thread, the sieve hole tube 7 is connected with the forward punching tube 10 through the.
Example 5
Preferably, as shown in fig. 1, the positive punching pipe 10 is formed by connecting four sections of positive punching cylindrical pipes in a through manner, the four sections of positive punching cylindrical pipes are a first section of positive punching cylindrical pipe, a second section of positive punching cylindrical pipe, a third section of positive punching cylindrical pipe and a fourth section of positive punching cylindrical pipe in sequence from left to right, the outer diameters of the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe and the third section of positive punching cylindrical pipe are gradually increased along with the direction away from the sieve hole pipe 7, one end face of the first section of positive punching cylindrical pipe, which is close to the sieve hole pipe 7, is not communicated, one end face of the first section of positive punching cylindrical pipe, which is away from the sieve hole pipe 7, is communicated with the second section of positive punching cylindrical pipe, a plurality of first-stage positive punching holes 8 are radially distributed on the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe is communicated with the third section of positive punching cylindrical pipe and has the same inner diameter, a plurality of second-stage positive punching holes 9 are radially, the external thread of the outer wall of the third section of the positive punching cylindrical pipe is matched with the internal thread of the sieve hole pipe 7, the third section of the positive punching cylindrical pipe is communicated with the fourth section of the positive punching cylindrical pipe, the inner diameter of the fourth section of the positive punching cylindrical pipe is the same as that of the third section of the positive punching cylindrical pipe, and the outer diameter of the fourth section of the positive punching cylindrical pipe is gradually reduced along the direction away from the sieve hole pipe 7.
Preferably, as shown in fig. 5 and 6, the number of the first-stage positive punched holes 8 is an even number, the even-numbered first-stage positive punched holes 8 are radially arranged along the circumferential direction of the first-stage positive punched pipe, the hole axes of each group of the first-stage positive punched holes 8 which are diametrically opposite to each other are overlapped, the number of the second-stage positive punched holes 9 is an even number, the even-numbered second-stage positive punched holes 9 are radially arranged along the circumferential direction of the second-stage positive punched pipe, the hole axes of each group of the second-stage positive punched holes 9 which are diametrically opposite to each other are overlapped, the hole diameters of the second-stage positive punched holes 9 are larger than the hole diameters of the first-stage positive punched holes 8, and the first-stage positive.
The axes of two diametrically opposite positive punching holes of each group coincide, and when gas-liquid mixed fluid passes through the primary positive punching hole 8 and the secondary positive punching hole 9, radial opposite punching is carried out, so that three times of dispersing and crushing are generated, the collision and crushing effect is stronger, and the uniform mixing and turbulent flow cavitation effect is better.
When the pressure behind the foam generating device is large, the liquid mixed fluid can flow out from the secondary positive punching hole 9, so that a fluid density field, a velocity field and a pressure field are more balanced, and the mixing and turbulence effects are better.
Example 6
Preferably, as shown in fig. 1, a foam generating method of the opposed foam generating apparatus as described above includes the following steps:
step 1) respectively connecting a nitrogen injection port and a foaming agent injection port at two ends of an opposite inlet pipe 1 with a nitrogen pump truck and a foaming agent pump truck, respectively pumping a gas phase and a liquid phase from two ends of the opposite inlet pipe 1 in a hedging manner, performing primary collision and mixing, and then entering a collecting pipe 2;
step 2) the gas-liquid mixed fluid entering the collecting pipe 2 flows to the staggered flushing pipe 5, the gas-liquid mixed fluid outside the staggered flushing pipe 5 is subjected to radial hedging through the first-stage staggered punching hole 3 and the second-stage staggered punching hole 4, a primary dispersing and crushing effect is generated, and a circumferential rotational flow mixing effect is generated at the same time;
step 3) then the gas-liquid mixed fluid flows to a sieve hole pipe 7 through a staggered flushing pipe 5, and the gas-liquid mixed fluid passes through sieve holes 6 of the sieve hole pipe 7 to generate a secondary dispersion crushing effect;
step 4), the gas-liquid mixed fluid after the secondary dispersion crushing action flows to the positive flushing pipe 10, the gas-liquid mixed fluid on the outer side of the positive flushing pipe 10 passes through the primary positive punching hole 8 and the secondary positive punching hole 9, and radial opposite flushing is carried out for the second time to generate a tertiary dispersion crushing action;
and 5) after three times of dispersion and crushing, forming foam by the gas-liquid mixed fluid, injecting the foam into a shaft of the oil-gas well through an outlet of the positive flushing pipe 10, and performing foam injection operation.
After three times of dispersion and crushing, the gas-liquid mixed fluid is fully mixed and repeatedly crushed, the optimal foaming effect can be achieved, foam is injected into a shaft of an oil-gas well through an outlet of the positive flushing pipe 10, and foam injection operations such as well drilling, fracturing, oil displacement, energy increasing, drainage assisting, water plugging and profile control are carried out.
Although circumferential uniform mixing is realized by the staggered flushing pipes, radial gas-liquid stratification is generated under the action of rotational flow (due to different densities), so that the forward flushing pipes are required to be further uniformly mixed; if the forward flushing pipe is staggered in the front and behind, the forward flushing pipe realizes mixing, but the gas-liquid density difference is large, the collision is not equal, the mixing and flow disturbing effects are not ideal, the staggered flushing pipe does not circumferentially stir and mix, and the gas-liquid stratification caused by the rotational flow of the staggered flushing pipe cannot be processed.
The working principle of the invention is as follows:
as shown in fig. 1, the invention discloses a hedging type foam generating device, which comprises a hedging pipe 1, a collecting pipe 2, a staggered punching pipe 5, a sieve hole pipe 7, a positive punching pipe 10 and a sealing ring 11, wherein the hedging pipe 1 and the collecting pipe 2 are in welded connection, the collecting pipe 2, the staggered punching pipe 5, the sieve hole pipe 7 and the positive punching pipe 10 are in threaded connection in sequence, the staggered punching pipe 5 is of a two-stage hedging structure, and two hole axes of each group of diametrically opposite hedging holes are staggered by a certain distance to generate a rotational flow mixing effect and improve a circumferential mixing effect; the sieve pore pipe 7 is in an axial sieve pore 6 structure, the positive punching pipe 5 is also in a two-stage step type radial opposite punching pore structure, the axes of two opposite holes of each group of opposite punching pores in the radial direction are superposed, the collision and crushing effects are stronger, and the uniform mixing and turbulent flow cavitation effects are better;
when in use, two ends of the counter inlet pipe 1 are respectively connected with a nitrogen pump truck and a foaming agent pump truck, and gas-liquid phases are respectively pumped from two ends of the counter inlet pipe 1 in a hedging manner, are subjected to preliminary collision and mixing, and then enter the collecting pipe 2; the gas-liquid mixed fluid entering the collecting pipe 2 flows to the staggered punching pipe 5, the gas-liquid mixed fluid on the outer side of the staggered punching pipe 5 is subjected to radial opposite punching through the first-stage staggered punching hole 3 and the second-stage staggered punching hole 4, a primary dispersion crushing effect is generated, and the effects of uniform mixing and turbulent flow cavitation are achieved; the axes of two holes of each group of radial opposite punched holes are staggered for a certain distance to generate a rotational flow stirring effect and improve the circumferential mixing effect; then the gas-liquid mixed fluid flows to a sieve pore pipe 7 through a staggered flushing pipe 5, and the gas-liquid mixed fluid passes through sieve pores 6 of the sieve pore pipe 7 to generate a secondary dispersion crushing effect; the gas-liquid mixed fluid after the secondary dispersion crushing action flows to the positive punching pipe 10, the gas-liquid mixed fluid on the outer side of the positive punching pipe 10 passes through the primary positive punching hole 8 and the secondary positive punching hole 9, radial opposite punching is carried out for the second time, the three-time dispersion crushing action is generated, the axes of two holes of each group of opposite punching holes which are opposite in the radial direction are superposed, the collision crushing action is stronger, and the uniform mixing and turbulent flow cavitation effects are better; after three times of dispersion and crushing, gas-liquid mixed fluid is fully mixed and repeatedly crushed, the best foaming effect can be achieved, foam is injected into a shaft of an oil-gas well through an outlet of the positive flushing pipe 10, and foam injection operations such as well drilling, fracturing, oil displacement, energy increasing and drainage assisting, water plugging and profile control are carried out.
Compared with the traditional spiral (impeller), curved path (winding plate), screen mesh (sieve mesh) and other structures, the invention is provided with two pairs of punching holes (staggered punching holes and positive punching holes), which generate symmetrical and uniform radial high-speed collision, the mixing uniformity is high, the collision crushing effect is strong, and the fluid collides with the screen mesh, so that the damage to the pipe body is small; the invention has multiple stages of punched holes, and has the effects of small flow resistance, large adaptive displacement and better mixing and turbulence effects compared with a Venturi tube.
The staggered punching pipe and the positive punching pipe are both of two-stage opposite punching hole structures, the two-stage opposite punching holes are distributed in a step mode in the radial direction and staggered in the circumferential direction, so that a density field, a speed field and a stress field of fluid flowing into the outer side and flowing out of the inner side are more balanced, and the mixing and turbulence effects are better.
According to the staggered punching pipe, two hole axes of each group of radially opposite first-stage staggered punching holes or second-stage staggered punching holes are staggered by a distance of half of the hole diameter, so that the whole staggered punching pipe generates a rotational flow effect, and the circumferential mixing effect is improved; the axes of two holes of each group of radially opposite primary positive punching holes or secondary positive punching holes of the positive punching pipe are superposed, the collision and crushing effects are stronger, and the uniform mixing and turbulent flow cavitation effects are better.
The staggered impact pipe is mainly uniformly mixed, the positive impact pipe is mainly collided and crushed, the uniform mixing function is realized firstly and then the powerful crushing function is realized according to the mixing and flow disturbing target of the foam generating device, and the staggered impact pipe is arranged in front of the positive impact pipe, so that the mixing and flow disturbing effects are better.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (9)
1. The utility model provides an offset foam generating device which characterized in that: the device comprises a pair of inlet pipes (1), a collecting pipe (2), a staggered punching pipe (5), a sieve hole pipe (7) and a forward punching pipe (10), wherein the pipe wall of the pair of inlet pipes (1) is in through connection with the input end of the collecting pipe (2), the two axial ends of the pair of inlet pipes (1) are respectively provided with a nitrogen injection port and a foaming agent injection port, the output end of the collecting pipe (2) is connected with the input end of the staggered punching pipe (5), the output end of the staggered punching pipe (5) is connected with the input end of the sieve hole pipe (7), the output end of the sieve hole pipe (7) is connected with the input end of the forward punching pipe (10), the staggered punching pipe (5) and the forward punching pipe (10) are of two-stage radial opposite punching hole structures, the two radial opposite punching holes of the staggered punching pipe (5) are staggered, and the two radial opposite punching hole axes of the forward punching pipe (10).
2. The opposed-impact foam generating device as claimed in claim 1, wherein: the pipe wall of the middle position in the axial direction of the opposite inlet pipe (1) is vertically welded and communicated with the input end of the collecting pipe (2), the nitrogen injection port at one end in the axial direction of the opposite inlet pipe (1) is connected with a nitrogen pump truck through a pipeline, and the foaming agent injection port at the other end in the axial direction of the opposite inlet pipe (1) is connected with a foaming agent pump truck through a pipeline.
3. The opposed-impact foam generating device as claimed in claim 1, wherein: the collecting pipe (2) is formed by connecting two sections of cylindrical pipes in a penetrating way, the inner wall of the cylindrical pipe, close to one side of the staggered flushing pipe (5), of the collecting pipe (2) is provided with an internal thread, the collecting pipe (2) is connected with the staggered flushing pipe (5) through the internal thread, and a sealing ring (11) is arranged at the joint of the collecting pipe (2) and the staggered flushing pipe (5).
4. A opposed foam generating apparatus according to claim 3, wherein: the staggered punching cylindrical pipe (5) is formed by connecting four staggered punching cylindrical pipes in a penetrating way, the four staggered punching cylindrical pipes are a first staggered punching cylindrical pipe, a second staggered punching cylindrical pipe, a third staggered punching cylindrical pipe and a fourth staggered punching cylindrical pipe from left to right in sequence, the diameter of each staggered punching cylindrical pipe is gradually increased along the direction far away from the collecting pipe (2), one end face, close to the collecting pipe (2), of the first staggered punching cylindrical pipe is not penetrated, one end face, far away from the collecting pipe (2), of the first staggered punching cylindrical pipe is penetrated with the second staggered punching cylindrical pipe, a plurality of first-stage staggered punching holes (3) are radially distributed on the first staggered punching cylindrical pipe, the second staggered punching cylindrical pipe is penetrated with the third staggered punching cylindrical pipe, a plurality of second-stage staggered punching holes (4) are radially distributed on the second staggered punching cylindrical pipe, an external thread is arranged on the outer wall of the third staggered punching cylindrical pipe, and the external thread on the outer wall of the third staggered punching cylindrical pipe is matched with the internal thread of the collecting pipe (2), the third-section staggered punching cylindrical pipe is communicated with the fourth-section staggered punching cylindrical pipe, the inner diameter and the outer diameter of the fourth-section staggered punching cylindrical pipe are respectively identical to those of the confluence pipe (2) close to one side of the staggered punching pipe (5), the inner wall of the fourth-section staggered punching cylindrical pipe close to one side of the sieve hole pipe (7) is provided with an internal thread, the fourth-section staggered punching cylindrical pipe of the staggered punching pipe (5) is connected with the sieve hole pipe (7) through the internal thread, and a sealing ring (11) is arranged at the joint of the staggered punching pipe (5) and the sieve hole pipe (7).
5. The opposed foam generating apparatus as recited in claim 4, wherein: the number of the first-stage staggered punched holes (3) is an even number, an even number of the first-stage staggered punched holes (3) are radially arranged along the circumferential direction of the first-stage staggered punched hole, the hole axis of each group of the radially opposite first-stage staggered punched holes (3) deviates from the distance of each half hole diameter in opposite directions, the number of the second-stage staggered punched holes (4) is an even number, the even number of the second-stage staggered punched holes (4) are radially arranged along the circumferential direction of the second-stage staggered punched hole, the hole axis of each group of the radially opposite second-stage staggered punched holes (4) deviates from the distance of each half hole diameter in opposite directions, the hole diameter of each second-stage staggered punched hole (4) is larger than the hole diameter of each first-stage staggered punched hole (3), and the first-stage staggered punched holes (3) and the second.
6. The opposed foam generating apparatus as recited in claim 4, wherein: the sieve pore pipe (7) is formed by two sections cylinder pipe through connections, and the cylinder pipe diameter that sieve pore pipe (7) is close to wrong towards pipe (5) one side is little and the outer wall is equipped with the external screw thread, and the external screw thread of sieve pore pipe (7) and the internal thread looks adaptation of wrong towards pipe (5), and the cylinder pipe terminal surface that sieve pore pipe (7) are close to wrong towards pipe (5) one side is equipped with a plurality of sieve meshes (6), and sieve mesh (6) set up along the axial of sieve pore pipe (7), the cylinder pipe diameter that sieve pore pipe (7) kept away from wrong towards pipe (5) one side is big, and sieve pore pipe (7) are close to the cylinder pipe inner wall of just towards pipe (10) one side and are equipped with the internal thread, and sieve pore pipe (7) are connected through internal thread and just towards pipe (10), and sieve pore pipe (7) and just towards pipe (10) junction and be equipped with sealing washer.
7. The opposed foam generating apparatus as recited in claim 6, wherein: the positive punching pipe (10) is formed by connecting four sections of positive punching cylindrical pipes in a through manner, the four sections of positive punching cylindrical pipes are a first section of positive punching cylindrical pipe, a second section of positive punching cylindrical pipe, a third section of positive punching cylindrical pipe and a fourth section of positive punching cylindrical pipe in sequence from left to right, the outer diameters of the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe and the third section of positive punching cylindrical pipe are gradually increased along the direction away from the sieve hole pipe (7), one end face, close to the sieve hole pipe (7), of the first section of positive punching cylindrical pipe is not communicated, one end face, away from the sieve hole pipe (7), of the first section of positive punching cylindrical pipe is communicated with the second section of positive punching cylindrical pipe, a plurality of primary positive punching holes (8) are radially distributed on the first section of positive punching cylindrical pipe, the second section of positive punching cylindrical pipe is communicated with the third section of positive punching cylindrical pipe, the inner diameter of the second section of positive punching cylindrical pipe is the same as that of the third section of positive punching cylindrical pipe, a plurality, the external thread of the outer wall of the third section of the positive punching cylindrical pipe is matched with the internal thread of the sieve hole pipe (7), the third section of the positive punching cylindrical pipe is communicated with the fourth section of the positive punching cylindrical pipe, the inner diameter of the fourth section of the positive punching cylindrical pipe is the same as that of the third section of the positive punching cylindrical pipe, and the outer diameter of the fourth section of the positive punching cylindrical pipe is gradually reduced along the direction far away from the sieve hole pipe (7).
8. The opposed foam generating apparatus as recited in claim 7, wherein: the number of the primary positive punched holes (8) is even, the even number of the primary positive punched holes (8) are radially arranged along the circumferential direction of the first section positive punched cylindrical pipe, the axis of each radial opposite primary positive punched hole (8) in each group is overlapped, the number of the secondary positive punched holes (9) is even, the even number of the secondary positive punched holes (9) are radially arranged along the circumferential direction of the second section positive punched cylindrical pipe, the axis of each radial opposite secondary positive punched hole (9) in each group is overlapped, the aperture of each secondary positive punched hole (9) is larger than that of each primary positive punched hole (8), and the primary positive punched holes (8) and the secondary positive punched holes (9) are radially distributed in a step and are staggered in phase in the circumferential direction.
9. A foam generating method of the opposed foam generating apparatus as set forth in claim 8, comprising the steps of:
step 1) connecting a nitrogen injection port and a foaming agent injection port at two ends of an opposite inlet pipe (1) with a nitrogen pump truck and a foaming agent pump truck respectively, and performing primary collision and mixing on a gas phase and a liquid phase which are respectively pumped from two ends of the opposite inlet pipe (1) and then enter a collecting pipe (2);
step 2), the gas-liquid mixed fluid entering the collecting pipe (2) flows to the staggered flushing pipe (5), the gas-liquid mixed fluid on the outer side of the staggered flushing pipe (5) is subjected to radial hedging through the first-stage staggered punching hole (3) and the second-stage staggered punching hole (4), a primary dispersing and crushing effect is generated, and a circumferential rotational flow mixing effect is generated at the same time;
step 3) allowing the gas-liquid mixed fluid to flow to the sieve hole pipe (7) through the staggered flushing pipe (5), and allowing the gas-liquid mixed fluid to pass through sieve holes (6) of the sieve hole pipe (7) to generate a secondary dispersion crushing effect;
step 4), the gas-liquid mixed fluid after the secondary dispersion crushing action flows to the positive flushing pipe (10), the gas-liquid mixed fluid on the outer side of the positive flushing pipe (10) passes through the primary positive punching hole (8) and the secondary positive punching hole (9), and radial opposite flushing is carried out for the second time to generate a tertiary dispersion crushing action;
and 5) after three times of dispersion and crushing, forming foam by the gas-liquid mixed fluid, injecting the foam into a shaft of the oil-gas well through an outlet of the positive flushing pipe (10), and performing foam injection operation.
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