CN109138960B - A kind of fracturing fluid and fracturing process - Google Patents
A kind of fracturing fluid and fracturing process Download PDFInfo
- Publication number
- CN109138960B CN109138960B CN201810914013.8A CN201810914013A CN109138960B CN 109138960 B CN109138960 B CN 109138960B CN 201810914013 A CN201810914013 A CN 201810914013A CN 109138960 B CN109138960 B CN 109138960B
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- China
- Prior art keywords
- fracturing
- swelling agent
- fracturing fluid
- aqueous solution
- fracturing process
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- 239000012530 fluid Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 230000008961 swelling Effects 0.000 claims abstract description 39
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical class [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical class [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/665—Compositions based on water or polar solvents containing inorganic compounds
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Road Paving Structures (AREA)
Abstract
The present invention provides a kind of fracturing fluid and fracturing process.The fracturing fluid is the swelling agent aqueous solution that the mass ratio of swelling agent and water is 1:3.The fracturing process, as fracturing fluid, does not need additionally to add proppant using swelling agent aqueous solution.Fracturing fluid of the invention is for pressure break middle layer and deep layer tight sandstone reservoir and shale reservoir.Fracture pressure can be improved using swelling agent aqueous solution as fracturing fluid in fracturing process of the invention, and the calcium carbonate generated with carbon dioxide reaction can be used as proppant, ensure that the integrality of flow-guiding channel.
Description
Technical field
The present invention relates to a kind of fracturing fluid and fracturing process more particularly to a kind of pressure breaks for not needing additionally to add proppant
Liquid and fracturing process, belong to technical field of petroleum extraction.
Background technique
Hydraulic fracturing technology is to develop tight sandstone reservoir and the most commonly used well stimulation of shale reservoir, pressure break mode
Selection has great influence to well yield.
Live routine pressure break generally uses aqueous fracturing fluid to carry out fracturing work, and pump first uses slippery water pressure break when infusing, then
Use load fluid pressure break and supporting crack.Conventional hydraulic pressure break needs high fracture pressure and complete proppant to lead in deep formation
Circulation road.Therefore, conventional hydraulic pressure break is larger to the limitation of exploitation deep reservoir.
Summary of the invention
In order to solve the above-mentioned technical problem, fracture pressure can be improved the purpose of the present invention is to provide one kind and rise
Guarantee the fracturing fluid of the integrality of flow-guiding channel without additional addition proppant to supporting role.
In order to achieve the above technical purposes, present invention firstly provides a kind of fracturing fluid, which is swelling agent and water
Mass ratio be 1:1-1:4 swelling agent aqueous solution, the fracturing fluid can be used for pressure break middle layer and deep layer tight sandstone reservoir and
Shale reservoir does not need additionally to add proppant.
The extension of the swelling agent that fracturing fluid of the invention uses at any time, is capable of providing bigger pressure, and it is wide to increase crack
Degree and Crack growth rate, can also generate complex fracture, achieve the purpose that frscturing raises speed.
Invention further provides a kind of middle layer and the fracturing process of deep layer tight sandstone reservoir and shale reservoir, the pressure break sides
Method, as fracturing fluid, does not need additionally to add proppant using swelling agent aqueous solution.
Fracturing process of the invention can provide high fracture pressure using swelling agent aqueous solution as fracturing fluid, with dioxy
Changing the calcium carbonate generated after carbon reaction can be used as proppant, ensure that the integrality of flow-guiding channel.
In fracturing process of the invention, the extension of the swelling agent of use at any time can provide bigger pressure, and increase is split
Slit width degree and Crack growth rate can also generate complex fracture, achieve the purpose that frscturing raises speed.
Detailed description of the invention
Fig. 1 is the schematic diagram of the fracturing process in the embodiment of the present invention 1.
Fig. 2 is the sandstone test specimen structural schematic diagram in the embodiment of the present invention 1.
Fig. 3 is the strain time graph in the embodiment of the present invention 1.
Main Reference symbol description:
1 fracturing fluid storage tank, 2 carbon dioxide holding tank, 3 fracturing unit truck group, 4 signal detection vehicle, 5 supercharging vehicle, 6 high pressure pipe joint
7 wellhead equipment, 8 pit shaft
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Fracturing fluid refers to the heterogeneous unstable chemical system formed according to a certain ratio by multiple additives, is to oil gas
Layer carries out the working solution used when fracturing reform, its main function is that the high pressure for forming ground installation is transmitted in stratum,
So that formation fracture is formed crack and conveys proppant along crack.
Load fluid refers to a kind of fracturing fluid for carrying proppant (such as quartzy sand grains, porcelain ball).
In a specific embodiment of the invention, a kind of middle layer and deep layer tight sandstone reservoir and shale reservoir are provided
Fracturing process, the fracturing process using swelling agent aqueous solution as fracturing fluid, do not need additionally to add proppant.
Specifically, the fracturing process in this embodiment of the invention, can specifically include following steps:
Swelling agent aqueous solution as fracturing fluid is injected into injection well, after pump injection pressure power reaches fracture pressure, after
Continuous injection 3min-10min；
Carbon dioxide is injected, after reaching design discharge capacity, stops pump note, completes pressure break.
Further, when pump injection pressure power reach fracture pressure after, continue inject 4min, 5min, 6min, 7min, 8min,
9min。
Wherein, the acoustic emission signal during fracturing fluid is injected by detection, determines whether pump injection pressure power has reached rupture
Pressure.Those skilled in the art can voluntarily determine fracture pressure by actual formation stress state.
More specifically, the injection rate of fracturing fluid can be 0.7m3/min-2m3/min；Further, the note of fracturing fluid
Entering speed can be 1m3/min-1.5m3/min.For example, the injection rate of fracturing fluid is 1.2m3/min、1.8m3/min。
In addition, carbon dioxide is reacted with fracturing fluid (swelling agent aqueous solution) after the carbon dioxide of injection reaches design discharge capacity,
Calcium carbonate is generated, the calcium carbonate of generation forms high flow-guiding channel as proppant, therefore, there is no need to additionally add proppant.Its
In, design discharge capacity refers to the injection rate of carbon dioxide, and discharge capacity is related with the injection rate of fracturing fluid, enough carbon dioxide and fracturing fluid
Reaction generates calcium carbonate as proppant, and the injection rate of carbon dioxide is determined according to this chemical process.
Wherein, the swelling agent aqueous solution that the fracturing fluid used is 1:1-1:4 for the mass ratio of swelling agent and water.Specifically,
The mass ratio of swelling agent and water can be 1:2,1:3 in fracturing fluid.
In a specific embodiment of the invention, the swelling agent that uses can for calcium oxide (CaO) class, entringite class and
Magnesia (MgO) class swelling agent.Wherein, calcium sulphoaluminate-calcium oxide cement expansive material has both calcium oxide and calcium sulphoaluminate
The characteristics of class swelling agent.For example, the swelling agent used is HSCA type swelling agent.
In another embodiment of the present invention, a kind of fracturing fluid is provided, which is swelling agent and water
Mass ratio is the swelling agent aqueous solution of 1:1-1:4.Specifically, the mass ratio of swelling agent and water can be 1:2,1:3 in fracturing fluid.
Specifically, the swelling agent used is HSCA type swelling agent.
Fracturing fluid of the invention can be used for pressure break middle layer and deep layer tight sandstone reservoir and shale reservoir.
Embodiment 1
A kind of fracturing process is present embodiments provided, as shown in Figure 1, the fracturing process may comprise steps of:
Swelling agent aqueous solution (HSCA type swelling agent and water that mass ratio is 1:3) is configured, well head is installed, connection fracturing fluid is deposited
Storage tank 1, carbon dioxide holding tank 2, fracturing unit truck group 3, signal detection vehicle 4, supercharging vehicle 5, high pressure pipe joint 6, wellhead equipment 7；
After pressure testing is qualified, pump note prepad fluid is started by high pressure pipe joint 6, first uses fracturing unit truck group 3 by low viscosity fracturing fluid
It is pumped into pit shaft 8, while sound emission situation during fracturing fluid is pumped into is surveyed in open signal detection car test, when pump-in pressure reaches rupture
After pressure, continue pump liquid 2min, closes the injection pump of fracturing unit truck group 3；
Be pumped into carbon dioxide using supercharging vehicle, the calcium carbonate that carbon dioxide generates after reacting with fracturing fluid as proppant,
High flow-guiding channel is formed, after reaching design discharge capacity, stops pump note, completes pressure break.
In room conditions, fracturing process is simulated with 20cm × 20cm × 10cm sandstone test specimen, in test specimen centre drill cut-off
Diameter 2.5cm circular hole, in hole, inner wall sticks axial direction and circumferencial direction foil gauge with Deformation Monitoring, and bonding method is as shown in Fig. 2, trying
Three directions of part add 4MPa-2MPa-0MPa confining pressure respectively, and injecting deployed swelling agent aqueous solution, (mass ratio is 1:3's
HSCA type swelling agent and water), strain variation situation increase with time is monitored, as shown in Figure 3.By in Fig. 3, circumferencial direction stress is
Y-axis value, time are x-axis value, and whereabouts reason is that sandstone rupture generates macrocrack at t=7.5h in curve, it can be seen that at any time
Between increase swelling agent pressure gradually increase, sandstone test piece deformation increase until destroy.
Claims (7)
1. the fracturing process of a kind of middle layer and deep layer tight sandstone reservoir and shale reservoir, which is characterized in that the fracturing process is adopted
It uses swelling agent aqueous solution as fracturing fluid, injects carbon dioxide, carbon dioxide is reacted with fracturing fluid generates calcium carbonate as support
Agent does not need additionally to add proppant.
2. fracturing process according to claim 1, which is characterized in that the fracturing process the following steps are included:
Swelling agent aqueous solution as fracturing fluid is injected into injection well, after pump injection pressure power reaches fracture pressure, continues to infuse
Enter 3min-10min；
After injecting carbon dioxide, stops pump note, complete pressure break.
3. fracturing process according to claim 2, which is characterized in that the injection rate of the fracturing fluid is 0.7m3/min-
2m3/min。
4. fracturing process according to claim 3, which is characterized in that the injection rate of the fracturing fluid is 1m3/min-
1.5m3/min。
5. fracturing process according to claim 1, which is characterized in that the fracturing fluid is that the mass ratio of swelling agent and water is
The swelling agent aqueous solution of 1:1-1:4.
6. fracturing process according to claim 1, which is characterized in that the fracturing fluid is that the mass ratio of swelling agent and water is
The swelling agent aqueous solution of 1:3.
7. fracturing process according to claim 5 or 6, which is characterized in that the swelling agent is HSCA type swelling agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914013.8A CN109138960B (en) | 2018-08-13 | 2018-08-13 | A kind of fracturing fluid and fracturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914013.8A CN109138960B (en) | 2018-08-13 | 2018-08-13 | A kind of fracturing fluid and fracturing process |
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| Publication Number | Publication Date |
|---|---|
| CN109138960A CN109138960A (en) | 2019-01-04 |
| CN109138960B true CN109138960B (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810914013.8A Active CN109138960B (en) | 2018-08-13 | 2018-08-13 | A kind of fracturing fluid and fracturing process |
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| CN112443305B (en) * | 2019-09-04 | 2022-07-05 | 中国石油化工股份有限公司 | Horizontal well fracturing method for promoting high fracture extension through twice acid injection and temporary plugging among clusters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2436576B (en) * | 2006-03-28 | 2008-06-18 | Schlumberger Holdings | Method of facturing a coalbed gas reservoir |
| US9388662B2 (en) * | 2011-11-08 | 2016-07-12 | Magnum Oil Tools International, Ltd. | Settable well tool and method |
| CN103773355B (en) * | 2014-01-15 | 2017-05-24 | 成都新柯力化工科技有限公司 | Fracturing propping agent for shale gas mining and preparation method thereof |
| CN104404965A (en) * | 2014-11-05 | 2015-03-11 | 浙江海洋学院 | Method for removing reinforced concrete support beams in foundation pit support |
| CN105696998A (en) * | 2016-04-05 | 2016-06-22 | 成都理工大学 | Shale gas reservoir fracturing modification method |
| CN107760296A (en) * | 2016-08-17 | 2018-03-06 | 刘海峰 | A kind of preparation method for being used to exploit shale gas fracturing propping agents |
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