CN112108028A - Bottom hole shearing foaming device for foam combined flooding - Google Patents
Bottom hole shearing foaming device for foam combined flooding Download PDFInfo
- Publication number
- CN112108028A CN112108028A CN202010984818.7A CN202010984818A CN112108028A CN 112108028 A CN112108028 A CN 112108028A CN 202010984818 A CN202010984818 A CN 202010984818A CN 112108028 A CN112108028 A CN 112108028A
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- foam
- shearing
- foaming device
- permanent magnet
- bearing
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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
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
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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
- B01F23/2351—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam using driven stirrers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention relates to a downhole shearing foaming device for foam combined flooding. The method mainly solves the problems that the prior injection process of the micro-foam has no reliable and effective mine injection method at present, and can not overcome the adverse factors of defoaming and breaking foam in a pipeline shaft when the foam is injected, so that the injection quality of the foam is influenced. The method is characterized in that: a bearing support frame is fixed at the lower outlet of the shearing foaming device, and a bearing is fixedly connected with the central hole of the bearing support frame; the upper end and the lower end of the bearing are respectively provided with a permanent magnet rotor and a plurality of shearing blades; a packer is arranged outside the round steel barrel at the lower part of the shearing and foaming device; a permanent magnet motor stator is fixed on the circular steel drum shell at the upper part of the shearing and foaming device and corresponds to the inner permanent magnet rotor; the middle part of the shearing foamer shell is circumferentially provided with a plurality of holes. The bottom shearing foam maker for foam combined flooding can greatly improve the injection quality of shearing foam, so that more foam is directly injected into the stratum, and adverse factors of foam defoaming and foam breaking are greatly reduced.
Description
Technical Field
The invention relates to the technical field of enhanced recovery ratio of tertiary oil recovery in oilfield development engineering, in particular to a bottom hole shearing foaming device for foam combination flooding.
Background
Foam flooding is an important technology for increasing recovery ratio by water shutoff and profile control, and has the capability of enlarging macroscopic swept volume and improving microscopic oil displacement efficiency. According to the traditional foam driving gas-liquid alternative injection method, the effect can be obtained only under the condition that the injected gas amount is very small, if too much gas can cause serious gas channeling, an injection and extraction system can be greatly influenced by gas-liquid alternation, a large amount of liquid can enter a large-scale compressor during switching, the compressor is damaged, the cost of the large-scale compressor is very high, and injection failure is caused once the large-scale compressor is damaged. In recent years, scholars at home and abroad prepare a micro-foam system with a special structure by a high-speed stirring and shearing method, the particle size of the micro-foam system is 10-100 micrometers, the thickness of a liquid film is 4-10 micrometers, the foam liquid outlet time and the liquid precipitation half-life period are both longer than 24 hours, and the micro-foam system shows good dynamic stability and coalescence stability. The micro-foam has stronger toughness and deformability, can be matched with pore throat passages with different sizes, and forms effective plugging. The sheared microfoam flooding has low injection pressure, higher maximum displacement pressure, longer breakthrough time and higher recovery ratio, and the microfoam has mobility similar to water at high flow rate, so the sheared microfoam system has the potential of being applied to the field of improving the recovery ratio of an oil field.
In fact, the foam flooding oil with different performances has different mechanisms, and the performances of the required foam are different. At present, a relatively mature micro-foam drilling fluid system and a micro-foam water treatment agent system are formed, and the two systems are used for field construction and achieve good effects. The shear-generated microfoam system has several characteristics: (1) better injectability; (2) the particle size is controllable: the micro-foams with different particle diameters can be prepared by changing the stirring speed, the foaming agent, the foam stabilizer concentration and the gas flow; (3) good stability: the microfoam shell is thicker, a Plateau boundary does not exist, and the microfoam shell has stronger stability under the harsh condition of a stratum; (4) the automatic matching pore throat passageway effectively blocks off the water flow passageway: the microfoam has certain strength and toughness and strong deformability; (5) strong oil washing effect: the foaming agent can reduce the oil-water interfacial tension, emulsify oil drops, strip an oil film, sweep residual oil at a blind end, and the micro-foam can enter smaller pores to expel and displace oil; (6) replenishing the formation energy: the microfoam moves into a low pressure environment and a portion of the energy inside is released, causing the microfoam to expand. The research on the micro-foam profile control system starts late and stays in an indoor research stage, the micro-foam profile control system can keep strong stability under severe stratum conditions due to the unique structure of the micro-foam, the micro-foam profile control system is expected to become one of effective methods for improving the recovery ratio, but a reliable and effective method is not available for the injection process of the micro-foam at present, the foam applied to a mine field is contacted and mixed and foamed in the stratum by adopting a gas-liquid alternative injection method, the method is successful in indoor experiments, but the gas flowing direction cannot be controlled for the actual stratum, and the gas is caused to escape inefficiently.
Without the support of perfect process, instrument and equipment, the good effect of foam combination flooding is not achieved. The invention fills the blank of the micro-foam injection technology, is the key point of the micro-foam injection technology, ensures that the sheared micro-foam is directly injected into the stratum at the bottom of the well, does not have foam loss in a midway delay process, has low operation cost, completes injection only by adjusting the flow of gas, realizes cost reduction and efficiency improvement, and becomes an effective guarantee for continuously improving the recovery ratio after chemical flooding.
Disclosure of Invention
The invention aims to solve the technical problem that the adverse factors of defoaming and foam breaking of foam in a pipeline shaft during foam injection cannot be overcome by the conventional micro-foam injection process in the background technology, so that the foam injection quality is influenced is solved, and the bottom hole shearing foam generator for foam compound flooding is provided.
The invention can solve the problems by the following technical scheme: the bottom hole shearing and foaming device for foam compound drive comprises a shearing and foaming device, wherein the upper part and the lower part of the shearing and foaming device are two circular steel barrel shells with different diameters, and the diameter of the upper circular steel barrel shell is larger than that of the lower circular steel barrel; the upper end and the lower end of the upper steel drum shell are respectively provided with an inlet end cover and a lower outlet, and the inlet end cover of the shearing foaming device is connected with the air inlet pipeline by screw threads; a bearing support frame is fixed at the upper part of the lower outlet of the shearing foaming device, a bearing is fixedly connected with the central hole of the bearing support frame, and holes are arranged at intervals between the central hole of the bearing support frame and the periphery of the bearing support frame; the upper end and the lower end of the bearing are respectively provided with a permanent magnet rotor and a plurality of shearing blades; a packer is arranged outside the round steel barrel at the lower part of the shearing and foaming device; a permanent magnet motor stator is fixed on the circular steel drum shell at the upper part of the shearing foaming device and corresponds to the inner permanent magnet rotor; the middle part of the shearing foamer shell is circumferentially provided with a plurality of holes.
Compared with the background technology, the invention has the following beneficial effects:
(1) can ensure that the shear foaming is injected into the stratum with high quality, and provides guarantee for the foam flooding technology. The bottom shearing foaming device is small and convenient, is arranged at the bottom of a well, is environment-friendly and efficient, has low cost, is convenient to use and easy to operate, and is connected with an external power supply through a pressure-resistant external plug wire port at the wellhead by a waterproof pressure-resistant cable.
(2) The operation is simple, and the injection gas amount can be adjusted to meet the required injection requirement. The invention solves the problem of gas channeling, can control the foam injection by only adjusting the gas flow valve, and can not form a large amount of gas channeling phenomenon.
(3) Compared with the ternary combination flooding, the foam flooding has the characteristics of low cost and high recovery ratio, can further improve the recovery ratio of a low-permeability layer, and is an effective method for improving the recovery ratio after chemical flooding, so the foam flooding agent is key equipment of the micro-foam flooding and is an effective guarantee for foam injection measures.
The bottom hole shearing and foaming device for foam combined flooding has the advantages of low cost, high oil displacement efficiency and remarkable economic benefit; a large amount of ineffective gas is not produced, and the injection of foam is ensured; the treatment cost of the produced liquid is effectively reduced, and the produced liquid does not have a large amount of invalid gas output due to the guarantee of the quality problem of foam injection, so that the cost of the produced liquid can be saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-compressed gas, 2-air inlet pipeline, 3-permanent magnet rotor, 4-shearing foam maker, 5-permanent magnet motor stator, 6-rotating bearing, 7-shearing blade, 8-bearing support frame, 9-packer, 10-snap ring and 11-hole.
FIG. 2 is a flow diagram of the gas-liquid and foam of the present invention;
fig. 3 is a structural view of a bearing bracket of the present invention.
The specific implementation mode is as follows:
the invention will be further explained below with reference to the accompanying drawings:
as shown in figure 1, the bottom hole shearing and foaming device for foam compound drive comprises a shearing and foaming device 4, wherein the upper part and the lower part of the shearing and foaming device 4 are two circular steel barrel shells with different diameters, and the diameter of the upper circular steel barrel shell is larger than that of the lower circular steel barrel; the upper end and the lower end of the upper steel drum shell are respectively provided with an inlet end cover and a lower outlet, the inlet end cover of the shearing and foaming device 4 is connected with the air inlet pipeline 2 through screw threads, and compressed gas 1 is introduced into the air inlet pipeline; a bearing support frame 8 is fixed at the upper part of the lower outlet of the shearing and foaming device 4, a bearing 6 is fixedly connected with the central hole of the bearing support frame 8, as shown in figure 3, a plurality of connecting ribs are connected between the central hole of the bearing support frame 8 and the periphery of the bearing support frame 8, and holes are formed between adjacent connecting ribs; the upper end and the lower end of the bearing 6 are respectively provided with a permanent magnet rotor 3 and 2-5 shearing blades 7; a packer 9 is arranged outside the round steel drum at the lower part of the shearing foaming device 4, a clamping ring 10 is arranged on the shearing foaming device 4 at the lower part of the packer 9, and the packer 9 is fixed on the shearing foaming device shell 4 through the clamping ring on the shell; a permanent magnet motor stator 5 is fixed on the circular steel drum shell at the upper part of the shearing foaming device 4, and the permanent magnet motor stator 5 corresponds to the inner permanent magnet rotor 3; the middle part of the shell of the shearing foaming device 4 is circumferentially provided with a plurality of holes 11; the permanent magnet motor stator is arranged on the shell of the foam generator and has the characteristics of water resistance, pressure resistance and non-conductivity; the permanent magnet rotor 3 is a neodymium magnet permanent magnet and is fixedly arranged on the bearing, so that the shearing blade on the bearing rotates at a high speed; the packer can effectively prevent liquid from passing through and firmly clamp the shearing foaming device at the bottom of the well.
The shearing foam maker is arranged at the bottom of a shaft, an air inlet pipeline is in threaded connection with a shearing foam maker shell 4, a permanent magnet rotor 3 in the foam maker rotates at a high speed under the driving of a permanent magnet motor stator 5, a coil is arranged in the stator and generates magnetism by electrification, an alternating current variable frequency magnetic field and the permanent magnet rotor repel each other in the same polarity to drive the rotor to rotate at a high speed, a shearing blade 7 is arranged on a bearing at the lower part of the rotating rotor, a bearing 6 is fixed on an 8 bearing bracket, gas and liquid bubbles can pass through the bearing, a packer 9 is arranged at the bottom of the shearing foam maker shell, the packer 9 is fixed on the shearing foam maker shell 4 by a snap ring on the shell, liquid in the annular space of the shaft enters the shearing foam maker through a hole 11 on the shearing foam maker shell and is mixed with compressed gas 1 in the air inlet pipeline 2 to generate fine micro foams under the high-speed rotation of the multistage, the arrowed lead lines in fig. 2 indicate the direction of streamlines through which the gas and liquid bubble through the shear.
The specific flow of the shear foaming is that, as shown in figure 2, high-pressure compressed gas of an air inlet pipeline enters a shear foaming device, enters through a hole on a bearing support frame (as shown in figure 3), continues to enter through a gap between a rotor permanent magnet and the inner wall of the foaming device, injected liquid enters the bottom of a well through a shaft and an annular space of the air inlet pipeline, foaming liquid enters a shearing device through a large hole in the middle of the foaming device and is mixed with the gas for shear foaming, the generated foam continues to pass through a large hole on a lower support frame under the action of the injection pressure and enters the bottommost part of the well, then enters a stratum through a blast hole at the bottom of the shaft, and only a few seconds are needed from the generation of the foam to the. After entering the stratum, the micro foam of the shear foam has the property that the mobility is similar to that of water, so that the injection capability and the injection quality of the foam are ensured to the maximum extent, the foam expands the swept volume, and simultaneously, the foam liquid also has the oil washing effect in the migration process of the foam, the recovery ratio is greatly improved, a reliable new means is provided for the smooth injection of the foam compound flooding in a mine field, and the key and decisive effect is played in the foam compound flooding.
Claims (6)
1. A bottom hole shearing foaming device for foam composite flooding comprises a shearing foaming device (4), wherein the upper part and the lower part of the shearing foaming device (4) are two circular steel barrel shells with different diameters, and the diameter of the upper circular steel barrel shell is larger than that of the lower circular steel barrel shell; the upper and lower ends of the upper steel drum shell are respectively provided with an inlet end cover and a lower outlet, and the upper steel drum shell is characterized in that: the inlet end cover of the shearing foaming device (4) is connected with the air inlet pipeline (2) through screw threads; a bearing support frame (8) is fixed at the upper part of the lower outlet of the shearing foaming device (4), a bearing (6) is fixedly connected with the central hole of the bearing support frame (8), and holes are arranged at intervals between the central hole of the bearing support frame (8) and the periphery of the bearing support frame (8); the upper end and the lower end of the bearing (6) are respectively provided with a permanent magnet rotor (3) and a plurality of shearing blades (7); a packer (9) is arranged outside the round steel barrel at the lower part of the shearing foaming device (4); a permanent magnet motor stator (5) is fixed on the circular steel drum shell at the upper part of the shearing foaming device (4), and the permanent magnet motor stator (5) corresponds to the inner permanent magnet rotor (3); the middle part of the shell of the shearing foaming device (4) is provided with a plurality of holes (11) along the circumferential direction.
2. The downhole shear foamer of claim 1 for foam flooding, wherein: a plurality of connecting ribs are connected between the center hole of the bearing support frame (8) and the periphery of the bearing support frame, and holes are formed between adjacent connecting ribs.
3. The downhole shear foamer of claim 1 for foam flooding, wherein: the shearing foaming device (4) at the lower part of the packer (9) is provided with a snap ring (10), and the packer (9) is fixed on the shearing foaming device shell (4) through the snap ring on the shell.
4. The downhole shear foamer of claim 1 for foam flooding, wherein: the permanent magnet rotor (3) is a neodymium magnet permanent magnet and is fixedly arranged on the bearing, so that the shearing blade on the bearing rotates at a high speed.
5. The downhole shear foamer of claim 1 for foam flooding, wherein: compressed gas (1) is introduced into the gas inlet pipeline.
6. The downhole shear foamer of claim 1 for foam flooding, wherein: the number of the shearing blades (7) is 2-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010984818.7A CN112108028B (en) | 2020-09-18 | 2020-09-18 | Bottom hole shearing foaming device for foam combined flooding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010984818.7A CN112108028B (en) | 2020-09-18 | 2020-09-18 | Bottom hole shearing foaming device for foam combined flooding |
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| Publication Number | Publication Date |
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| CN112108028A true CN112108028A (en) | 2020-12-22 |
| CN112108028B CN112108028B (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010984818.7A Active CN112108028B (en) | 2020-09-18 | 2020-09-18 | Bottom hole shearing foaming device for foam combined flooding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115945115A (en) * | 2022-12-16 | 2023-04-11 | 重庆科技学院 | Tertiary stirring one-level acceleration rate oil jacket annular space bubbling device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730676A (en) * | 1982-12-06 | 1988-03-15 | Halliburton Company | Downhole foam generator |
| CN202015582U (en) * | 2011-04-11 | 2011-10-26 | 西安西科煤矿安全通风防灭火研究所有限公司 | Foaming device for use in coal mine and foam dedusting equipment |
| CN102305055A (en) * | 2011-08-10 | 2012-01-04 | 中国石油天然气股份有限公司 | Air foam flooding shaft bottom foaming process pipe column |
| CN202202854U (en) * | 2011-09-07 | 2012-04-25 | 江苏华安科研仪器有限公司 | High-pressure magnetic coupling type foam generation device |
| CN107956459A (en) * | 2016-10-18 | 2018-04-24 | 中国石油天然气股份有限公司 | A kind of foam injection device and its application method and installation method |
| CN207769571U (en) * | 2017-12-21 | 2018-08-28 | 陕西延长石油(集团)有限责任公司研究院 | A kind of underground foam generating device |
| CN110354704A (en) * | 2019-03-14 | 2019-10-22 | 中国石油天然气股份有限公司 | Foam generating device |
| CN110585947A (en) * | 2019-09-20 | 2019-12-20 | 西南石油大学 | Foam drilling fluid produces device |
-
2020
- 2020-09-18 CN CN202010984818.7A patent/CN112108028B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730676A (en) * | 1982-12-06 | 1988-03-15 | Halliburton Company | Downhole foam generator |
| CN202015582U (en) * | 2011-04-11 | 2011-10-26 | 西安西科煤矿安全通风防灭火研究所有限公司 | Foaming device for use in coal mine and foam dedusting equipment |
| CN102305055A (en) * | 2011-08-10 | 2012-01-04 | 中国石油天然气股份有限公司 | Air foam flooding shaft bottom foaming process pipe column |
| CN202202854U (en) * | 2011-09-07 | 2012-04-25 | 江苏华安科研仪器有限公司 | High-pressure magnetic coupling type foam generation device |
| CN107956459A (en) * | 2016-10-18 | 2018-04-24 | 中国石油天然气股份有限公司 | A kind of foam injection device and its application method and installation method |
| CN207769571U (en) * | 2017-12-21 | 2018-08-28 | 陕西延长石油(集团)有限责任公司研究院 | A kind of underground foam generating device |
| CN110354704A (en) * | 2019-03-14 | 2019-10-22 | 中国石油天然气股份有限公司 | Foam generating device |
| CN110585947A (en) * | 2019-09-20 | 2019-12-20 | 西南石油大学 | Foam drilling fluid produces device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115945115A (en) * | 2022-12-16 | 2023-04-11 | 重庆科技学院 | Tertiary stirring one-level acceleration rate oil jacket annular space bubbling device |
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| CN112108028B (en) | 2022-10-04 |
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