CN106499378B - Concentric tube type underground supercritical carbon dioxide jet flow sand mixing device - Google Patents
Concentric tube type underground supercritical carbon dioxide jet flow sand mixing device Download PDFInfo
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- CN106499378B CN106499378B CN201611237895.6A CN201611237895A CN106499378B CN 106499378 B CN106499378 B CN 106499378B CN 201611237895 A CN201611237895 A CN 201611237895A CN 106499378 B CN106499378 B CN 106499378B
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- concentric
- pipe
- concentric inner
- tube
- carbon dioxide
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000004576 sand Substances 0.000 title claims abstract description 34
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 29
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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)
- Jet Pumps And Other Pumps (AREA)
- Earth Drilling (AREA)
Abstract
A concentric tube type underground supercritical carbon dioxide jet flow sand mixing device comprises a concentric outer tube connected with a concentric tubular column in a shaft, wherein a concentric inner tube is arranged in the concentric outer tube, 2-4 balance holes are uniformly distributed in the circumferential direction at the upper part of the concentric inner tube, and 2-4 suction ports are uniformly distributed in the circumferential direction at the middle part of the concentric inner tube; the annular space between the concentric outer pipe and the concentric inner pipe is sealed by a sealing plug, and a jet device is fixed in the concentric inner pipe; the invention overcomes the major defect that the ground sand mixing process can not control the underground sand concentration due to the adoption of the jet flow principle, and has the characteristic of controlling the underground fracturing fluid sand concentration in real time; meanwhile, the defect that high pressure and low temperature are required for mixing the ground liquid-phase carbon dioxide with the propping agent is thoroughly overcome, and the reliability and the economy are improved.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas industry, and particularly relates to a concentric tube type underground supercritical carbon dioxide jet flow sand mixing device.
Background
The supercritical carbon dioxide fracturing technology is taken as a fracturing technology with prospect. The supercritical state is different from the fluid states of gas and liquid, the supercritical carbon dioxide has high density close to liquid, low viscosity close to gas, strong dissolving capacity and high diffusion coefficient, and the supercritical carbon dioxide fracturing fluid is one of the best working fluid systems for communicating micro cracks of a reservoir stratum to cause a crack network. The mixing of the liquid-phase carbon dioxide, the quartz sand and other proppants needs a ground sand mixing device and needs to be carried out under the working conditions of high pressure and low temperature, so that the ground sand mixing device has extremely high requirements. Meanwhile, the existing control method of the ground fracturing sand concentration is to press the prepared fracturing fluid with certain sand concentration into the stratum through a fracturing pump truck and a pipe column by a ground sand mixing device; when the sand concentration needs to be adjusted, fracturing fluid with certain sand concentration and new mixing ratio can be conveyed to the stratum through the fracturing pump truck and the pipe column again only through the ground sand mixing device; therefore, a certain time is needed before and after the sand concentration is adjusted, and the sand carrying capacity is poor due to the low viscosity of the supercritical carbon dioxide, so that the sand concentration of the fracturing fluid reaching the stratum cannot be controlled in real time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a concentric tube type underground supercritical carbon dioxide jet flow sand mixing device which has the characteristics of realizing underground sand mixing, controlling the sand concentration in real time and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a concentric tube type underground supercritical carbon dioxide jet flow sand mixing device comprises a concentric outer tube 1 connected with a concentric tubular column in a shaft, wherein a concentric inner tube 2 is arranged in the concentric outer tube 1, 2-4 balance holes 3 are uniformly distributed at the upper part of the concentric inner tube 2 in the circumferential direction, and 2-4 suction ports 6 are uniformly distributed at the middle part of the concentric inner tube 2 in the circumferential direction; the annular space between the concentric outer tube 1 and the concentric inner tube 2 is sealed by a sealing plug 10, and a jet device is fixed in the concentric inner tube 2.
The jet device comprises a liquid guide pipe 4, a nozzle 7, a support ring 5, a throat pipe 8 and a diffusion pipe 9, wherein the liquid guide pipe 4 is fixedly arranged in the concentric inner pipe 2 and is positioned below the balance hole 3; the liquid guide pipe 4 is connected with a nozzle 7, the nozzle 7 is connected with a throat pipe 8 through a support ring 5 with an opening, and the throat pipe 8 is connected with a diffusion pipe 9 and fixedly arranged on the concentric inner pipe 1.
The total cross-sectional area of the balancing holes 3 is smaller than the cross-sectional area of the nozzle 7.
The supporting ring 5 is provided with 2-4 groove-shaped through holes which are uniformly distributed in the circumferential direction and correspond to the suction inlet 6 on the concentric inner pipe 1.
The invention has the following advantages:
1. the operation is simple, the underground jet flow sand mixing device is connected with the concentric pipe and is put into the shaft along with the concentric pipe column, and the pipe column and the device are convenient to pull out.
2. The process and the sand mixing device for mixing the ground liquid-phase carbon dioxide and the propping agent and injecting the mixture into the rock stratum are thoroughly changed, and the ground sand mixing device for mixing the carbon dioxide and the propping agent under the conditions of high pressure and low temperature is replaced by the underground jet flow sand mixing device, so that the equipment is simplified, and the reliability and the economical efficiency are improved.
3. The invention overcomes the great defect that the underground sand concentration can not be controlled by the ground sand mixing process, and the well-regulated sand concentration on the ground can be changed when reaching the stratum due to the characteristics of low viscosity and poor sand suspending capability of the supercritical carbon dioxide.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a concentric tube type downhole supercritical carbon dioxide jet flow sand mixing device comprises a concentric outer tube 1 in threaded connection with a concentric tube column in a shaft, wherein a concentric inner tube 2 is arranged in the concentric outer tube 1, the concentric inner tube 2 is in threaded connection with the concentric tube column in the shaft, 2-4 groove-shaped balance holes 3 (through holes) are uniformly distributed in the circumferential direction at the upper part of the concentric inner tube 2, and 2-4 groove-shaped suction ports 6 (through holes) are uniformly distributed in the circumferential direction at the middle part of the concentric inner tube 2; the annular space between the concentric outer tube 1 and the concentric inner tube 2 is sealed through a sealing plug 10, the sealing plug 10 is connected with the concentric outer tube 1 through threads, and the annular space between the concentric outer tube 1 and the concentric inner tube 2 is sealed. A jet device is fixed in the concentric inner tube 2.
The jet device comprises a liquid guide pipe 4, a nozzle 7, a support ring 5, a throat pipe 8 and a diffusion pipe 9, wherein the liquid guide pipe 4 is fixedly arranged in the concentric inner pipe 2 and is positioned below the balance hole 3; the liquid guide pipe 4 is connected with the nozzle 7, the nozzle 7 is connected with the throat pipe 8 through the support ring 5 with the opening, the gap between the throat pipe 8 and the nozzle 7 is a suction channel, and the throat pipe 8 is connected with the diffusion pipe 9 and is fixedly arranged on the concentric inner pipe 1.
The total cross-sectional area of the balancing holes 3 is smaller than the cross-sectional area of the nozzle 7.
The supporting ring 5 is provided with 2-4 groove-shaped through holes which are uniformly distributed in the circumferential direction and correspond to the suction inlet 6 on the concentric inner pipe 1.
The working principle of the invention is as follows:
when the jet device is installed at a well site, the jet device is firstly fixedly arranged in the concentric inner pipe 2, namely, the nozzle 7 is firstly connected with the liquid guide pipe 4, then the nozzle is fixedly arranged in the concentric inner pipe 2 and is positioned below the balance hole 3, then the support ring 5 is arranged in the concentric inner pipe 2, the groove-shaped through hole on the support ring 5 is adjusted to correspond to the suction inlet 6 on the concentric inner pipe 2, the throat pipe 8 is connected with the support ring 5, and finally the diffusion pipe 9 is connected with the throat pipe 8 and is fixedly arranged on the concentric inner pipe 1. And secondly, connecting the concentric inner pipe 2 with an inner pipe column of the concentric pipe column through threads. The concentric outer tube 1 is then threadedly connected to the outer tubing string of the concentric tubing string. And finally, connecting the sealing plug 10 with the concentric outer pipe 1 through threads, and sealing an annular space between the concentric outer pipe 1 and the concentric inner pipe 2.
When the underground jet flow sand mixing device works, after the underground jet flow sand mixing device is put into a shaft along with a concentric pipe column to a preset position, supercritical carbon dioxide A reaches the concentric inner pipe 2 through the concentric pipe column, and a propping agent B reaches the annular space between the concentric inner pipe 2 and the concentric outer pipe 1 through the concentric pipe column and is encapsulated in the annular space by the sealing plug 10. The supercritical carbon dioxide A is divided into two parts in the concentric inner pipe 2, wherein the smaller flow rate enters the annular space between the concentric inner pipe 2 and the concentric outer pipe 1 through the balance holes 3 of the concentric inner pipe 2, and the rest most flow rate flows to the nozzle 7 through the liquid guide pipe 4. The supercritical carbon dioxide A forms high-speed low-pressure liquid flow after being throttled by the nozzle 7, pressure difference is formed between the outlet of the nozzle 7, the groove-shaped hole of the supporting ring 5, the suction inlet 6 on the concentric inner pipe 2 and two ends of a flow channel of an annular space of the concentric inner pipe 2 and the concentric outer pipe 1, the supporting agent B is sucked in through the supporting ring 5 and the suction inlet 6 on the concentric inner pipe 2 under the action of the pressure difference, flows into the throat pipe 8 to form mixed liquid C, and flows into the stratum after the speed reduction and the pressure increase through the diffusion pipe 9.
Claims (1)
1. A concentric tube type underground supercritical carbon dioxide jet flow sand mixing device is characterized by comprising a concentric outer tube (1) connected with a concentric tube column in a shaft, wherein a concentric inner tube (2) is arranged in the concentric outer tube (1), 2-4 balance holes (3) are uniformly distributed in the circumferential direction on the upper part of the concentric inner tube (2), and 2-4 suction ports (6) are uniformly distributed in the circumferential direction in the middle of the concentric inner tube (2); an annular space between the concentric outer pipe (1) and the concentric inner pipe (2) is sealed by a sealing plug (10), and a jet device is fixed in the concentric inner pipe (2);
the jet device comprises a liquid guide pipe (4), a nozzle (7), a support ring (5), a throat pipe (8) and a diffusion pipe (9), wherein the liquid guide pipe (4) is fixedly arranged in the concentric inner pipe (2) and is positioned below the balance hole (3); the liquid guide pipe (4) is connected with the nozzle (7), the nozzle (7) is connected with the throat pipe (8) through the support ring (5) with the opening, and the throat pipe (8) is connected with the diffuser pipe (9) and is fixedly arranged on the concentric inner pipe (2);
the total cross-sectional area of the balance holes (3) is smaller than the cross-sectional area of the nozzle (7);
the supporting ring (5) is provided with 2-4 groove-shaped through holes which are uniformly distributed in the circumferential direction and correspond to the suction inlet (6) on the concentric inner pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611237895.6A CN106499378B (en) | 2016-12-28 | 2016-12-28 | Concentric tube type underground supercritical carbon dioxide jet flow sand mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611237895.6A CN106499378B (en) | 2016-12-28 | 2016-12-28 | Concentric tube type underground supercritical carbon dioxide jet flow sand mixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106499378A CN106499378A (en) | 2017-03-15 |
| CN106499378B true CN106499378B (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611237895.6A Active CN106499378B (en) | 2016-12-28 | 2016-12-28 | Concentric tube type underground supercritical carbon dioxide jet flow sand mixing device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109025946B (en) * | 2018-08-23 | 2020-12-01 | 陕西延长石油(集团)有限责任公司研究院 | Adjustable is supercritical carbon dioxide efflux mulling device in pit |
| CN109025825B (en) * | 2018-10-10 | 2020-09-15 | 东北石油大学 | Underground self-suction particle jet drilling device based on Venturi effect |
| CN112240316B (en) * | 2019-07-17 | 2022-09-23 | 中国石油化工股份有限公司 | Adjustable ejector |
| CN111042793A (en) * | 2020-01-16 | 2020-04-21 | 西安石油大学 | Carbon dioxide fracturing ground jet flow sand mixing device |
| CN111271041A (en) * | 2020-01-20 | 2020-06-12 | 西安石油大学 | Normal pressure type carbon dioxide fracturing ground sand mixing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280671A (en) * | 2008-05-09 | 2008-10-08 | 中国石油新疆油田分公司采油工艺研究院 | Concentric tube jet flow negative pressure sand washing apparatus and using method thereoof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2958047C (en) * | 2014-09-15 | 2019-03-19 | Halliburton Energy Services, Inc. | Jetting tool for boosting pressures at target wellbore locations |
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2016
- 2016-12-28 CN CN201611237895.6A patent/CN106499378B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280671A (en) * | 2008-05-09 | 2008-10-08 | 中国石油新疆油田分公司采油工艺研究院 | Concentric tube jet flow negative pressure sand washing apparatus and using method thereoof |
Non-Patent Citations (1)
| Title |
|---|
| 同心管射流负压冲砂技术研究与应用;谢斌等;《石油机械》;20130810(第08期);全文 * |
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| CN106499378A (en) | 2017-03-15 |
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