CN115324552A - Fracturing and crack-making method based on chemical reaction and reservoir fracturing modification method - Google Patents
Fracturing and crack-making method based on chemical reaction and reservoir fracturing modification method Download PDFInfo
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- CN115324552A CN115324552A CN202211151420.0A CN202211151420A CN115324552A CN 115324552 A CN115324552 A CN 115324552A CN 202211151420 A CN202211151420 A CN 202211151420A CN 115324552 A CN115324552 A CN 115324552A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 33
- 238000002715 modification method Methods 0.000 title abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 34
- 239000007800 oxidant agent Substances 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 239000013043 chemical agent Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000004880 explosion Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229920002907 Guar gum Polymers 0.000 claims description 3
- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 claims description 3
- 235000000380 Nyssa aquatica Nutrition 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 229960003711 glyceryl trinitrate Drugs 0.000 claims description 3
- 229960002154 guar gum Drugs 0.000 claims description 3
- 235000010417 guar gum Nutrition 0.000 claims description 3
- 239000000665 guar gum Substances 0.000 claims description 3
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 13
- 230000001590 oxidative effect Effects 0.000 description 10
- 230000000977 initiatory effect Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004058 oil shale Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- -1 or the like Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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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
- E21B43/25—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
- E21B43/16—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)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention provides a fracturing and crack-making method based on chemical reaction and a reservoir fracturing modification method, wherein the method comprises the following steps: s1, manufacturing a main fracture in a stratum in a hydraulic fracturing mode; s2, introducing a first chemical agent into the main crack in a slug mode; s3, introducing fracturing fluid into the main crack; s4, introducing a second chemical agent into the main crack after a period of time, and after the second chemical agent enters the stratum and is mixed with the first chemical agent to perform a sharp heating reaction and initiate explosion to generate fine cracks; s5, repeating the steps S2 to S4; s6, manufacturing a complex seam net through second hydraulic fracturing; the first chemical and the second chemical may both be oxidizing agents or reducing agents and may not be both oxidizing agents or both reducing agents. The reservoir fracturing modification method comprises the fracturing and seam making method based on chemical reaction. The beneficial effects of the invention include: the fracture pressure can be reduced by explosion and seam making through chemical reaction, and effective channels are established.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a fracturing and crack-making method based on chemical reaction and a reservoir fracturing modification method.
Background
The proppant is used as a commonly used functional material in the current fracturing modification, is usually pumped into a stratum along with a fracturing fluid in the fracturing process, and realizes the supporting function of a fracturing fracture after fracturing is completed. Proppants of various materials and sizes also currently exist. At present, the propping agent mainly depends on ground equipment to generate hydraulic high pressure, so that the stratum is fractured, the propping agent is ensured to enter the stratum, and the propping agent is left in the fracture to prop the stratum after fracturing.
Patent document CN202010964426.4 discloses a method for controlling directional fracturing and fracture-making based on cold and hot alternate crushed rock, which belongs to the technical field of hydraulic fracturing, and the method achieves the purpose of directionally fracturing an oil shale reservoir by cold and hot alternate crushed rock through eddy current heating and injection of low-temperature fracturing fluid, and solves the problem that the expansion direction of a fracture cannot be controlled by using a hydraulic fracturing technology to reconstruct the reservoir in the in-situ exploitation process of oil shale. The invention relates to a method for controlling directional fracturing and seam making based on cold and hot alternate crushed rock, which weakens the mechanical property of oil shale in a cold and hot alternate mode and can only be limited in a near-wellbore area.
Patent document CN201920763777.1 discloses a simulation shale stratum fracturing makes seam experimental apparatus, including barrel, gum cover, cushion, solid fixed ring, the sealed head of gum cover, end cap and gim peg, the shale rock core is placed in the gum cover, be equipped with vertical pressurized port and horizontal pressurized port on the barrel, the gum cover links to each other with the sealed head of gum cover, the sealed overhead rubber seal that is equipped with of gum cover, the inside notes liquid hole that is equipped with of end cap, annotate external pressure sensor in liquid hole and plunger pump. The device can simulate the pressure in different directions in a shale stratum, measure the rock fracture pressure of a shale core, the fracturing and crack forming process of fracturing fluid in the shale and the extending form of a crack in the shale, but does not provide corresponding effective optimization measures.
At present, in the more mature oil and gas reservoir exploitation technology all over the world, hydraulic fracturing technology is mostly adopted to make seams in the reservoir. The hydraulic fracturing technology can generate better fractures in a reservoir, but the generated fractures are mainly a main fracture and cannot form a complex fracture network system, and the fractures are always generated in the weak part of the reservoir and cannot be directionally fractured to reach the required reservoir. Therefore, a need exists for a method of making longer, wider, more complex seamed webs.
Disclosure of Invention
The present invention is directed to addressing at least one of the above-identified deficiencies in the prior art. For example, it is an object of the present invention to provide a method by which complex stitched webs can be manufactured. Another object of the present invention is to provide a method of reservoir fracture reformation.
In order to achieve the above object, one aspect of the present invention provides a fracturing and seam making method based on chemical reaction, including the following steps: s1, manufacturing a main fracture in a stratum in a hydraulic fracturing mode; s2, introducing a certain volume of first chemical agent into the main crack in a slug mode; s3, introducing fracturing fluid into the main crack; s4, introducing a certain volume of second chemical agent into the main crack after a period of time, and when the second chemical agent enters the stratum and is mixed with the first chemical agent, carrying out a rapid heating reaction and initiating explosion to generate a fine crack; s5, repeating the steps S2-S4 according to actual requirements, wherein a period of time is arranged between each repetition; s6, manufacturing a complex seam net through second hydraulic fracturing; wherein when the first chemical is a reducing agent, the second chemical is an oxidizing agent; when the first chemical is an oxidizing agent, the second chemical is a reducing agent.
Alternatively, the reducing agent may include one of glyceryl trinitrate, hydrocyanic acid, and phenol.
Alternatively, the oxidizing agent may include one of hydrogen peroxide, potassium chlorate, and potassium permanganate.
Alternatively, the first chemical agent may be introduced into the chamber at a volume of 0.5 to 5m per time 3 。
Alternatively, the volume of the second chemical agent per time can be 0.5-5 m 3 。
Alternatively, the fracturing fluid may include one of slick water and guar gum, and the amount of the fracturing fluid introduced per time may be 10-100 m 3 。
Alternatively, the interval time in the step S5 may be 1 to 5000 seconds.
Optionally, the pump injection displacement of the main fracture manufactured by hydraulic fracturing is 1-20 m 3 Min, pumping 10-100 m of fracturing fluid 3 (ii) a The injection displacement of the second hydraulic fracturing pump is 1-20 m 3 Min, pumping fracturing fluid 50-1000 m 3 。
Alternatively, the first chemical, the fracturing fluid, and the second chemical may be pumped.
In another aspect, the invention provides a method of reservoir fracture reformation, which comprises a chemical reaction-based fracture-making method as described above.
Compared with the prior art, the beneficial effects of the invention comprise at least one of the following:
(1) The small seam net can be manufactured automatically through chemical reaction explosion seam construction on the premise of not depending on hydraulic fracturing, conditions are created for manufacturing longer, wider and more complex seam nets through hydraulic fracturing later, and energy consumption of hydraulic fracturing seam construction is greatly reduced.
(2) The distribution state of the ground stress around the fracturing fluid in the stratum can be changed by chemical reaction explosion fracture making, and the fracture is prevented from extending along the direction of the maximum main stress all the time and a complex fracture network cannot be formed.
(3) The crack can be formed through chemical reaction explosion, so that the cracking pressure can be reduced, an effective channel is established, and convenience is provided for other later processes.
(4) The fracturing and seam-making method based on chemical reaction can reduce ground equipment, and is convenient and rapid.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a schematic diagram of pumping a primary oxidant and a reductant in accordance with an exemplary embodiment of the present invention.
FIG. 2 is a graph illustrating the variation of wellhead pressure during the implementation of a fracturing and fracking method in accordance with an exemplary embodiment of the present invention.
Description of reference numerals:
1-fracturing fluid; 2-an oxidizing agent; 3-a reducing agent; 4-producing zone;
a-the moment when the oxidizing agent and the reducing agent begin to contact; b-crack initiation moment; c-finishing the seam.
Detailed Description
The present invention will be better understood by those skilled in the art from the following detailed description taken in conjunction with the accompanying drawings.
Exemplary embodiment 1
The present exemplary embodiment provides a fracturing and seam-making method based on chemical reaction, the method comprising the steps of:
s1, manufacturing a main fracture in the stratum in a hydraulic fracturing mode.
In the embodiment, the injection capacity of the hydraulic fracturing pump is 1-20 m 3 Min, e.g. 2m 3 /min、5m 3 /min、10m 3 /min、15m 3 /min、19m 3 Min; 10-100 m of pump-injected fracturing fluid 3 E.g. 15m 3 、20m 3 、30m 3 、50m 3 、70m 3 、80m 3 、85m 3 、90m 3 、99m 3 . Here, the main fractures are mainly made by means of hydraulic fracturing techniques.
And S2, introducing a certain volume of reducing agent into the main crack in a slug mode.
In this embodiment, the reducing agent may be one selected from glyceryl trinitrate, hydrocyanic acid and phenol, and the reducing agent needs to be liquid at normal temperature and insoluble in water.
In this example, the reducing agent is pumped in slug form. The pumping in the form of the slug is mainly used for realizing that the reducing agent and the oxidizing agent are mutually isolated in the shaft and cannot be contacted with each other, and are mixed and contacted only after entering a formation fracture, so that the explosion caused in the shaft is avoided.
In this embodiment, the amount of the reducing agent introduced per time is 0.5 to 5m 3 E.g. 1m 3 、2m 3 、3m 3 、4m 3 。
And S3, introducing a fracturing fluid into the main crack.
In this embodiment, the fracturing fluid may include one of slick water and guar gum. As shown in figure 1, during the pumping process of the shaft, the oxidizing agent and the reducing agent must be isolated by using a conventional fracturing fluid in the middle, so that the oxidizing agent and the reducing agent are prevented from being mixed in the shaft to generate a chemical reaction.
In the embodiment, the amount of the fracturing fluid introduced per time is 10-100 m 3 E.g. 15m 3 、20m 3 、30m 3 、50m 3 、70m 3 、80m 3 、85m 3 、90m 3 、99m 3 。
And S4, introducing a certain volume of oxidant into the main cracks after a period of time, mixing the oxidant with a reducing agent distributed in the cracks of the stratum after the oxidant enters the stratum, generating a rapid heating reaction and initiating explosion to generate fine cracks.
In this embodiment, the oxidant may be hydrogen peroxide, potassium chlorate, potassium permanganate, or the like, and the oxidant is liquid at normal temperature.
In this embodiment, the amount of the oxidizing agent introduced per time is 0.5 to 5m 3 E.g. 1m 3 、2m 3 、3m 3 、4m 3 . The amount of oxidizing agent and reducing agent used is determined by the formation permeability and the formation fracture pressure, with lower formation permeability and higher formation fracture pressure, and higher amounts of oxidizing agent and reducing agent used.
After the reducing agent is pumped for a certain time, the oxidizing agent with a certain volume is pumped, and after the oxidizing agent is pumped into the stratum, the oxidizing agent is mixed with the reducing agent distributed in the fracture to generate a rapid heating reaction and initiate explosion, so that the pressure in the fracture is rapidly increased. When the pressure in the fracture is higher than the fracture pressure of the stratum, a new fracture is generated on the basis of the existing fracture, and therefore the purpose of manufacturing a complex fracture network is achieved.
And S5, repeating the steps S2-S4 according to actual requirements, wherein a period of time is arranged between each repetition.
In this embodiment, fig. 1 shows a flow of pumping a primary oxidant 2 and a reductant 3, after the pumped reductant 3 is sent into a producing zone 4, a certain volume of the oxidant 2 is pumped, and the pumped oxidant 2 and the reductant 3 need to be isolated by a fracturing fluid 1. According to actual needs, the same pumping process of the oxidant and the reducing agent can be carried out for a plurality of times, and a certain time interval is needed between each repetition.
Further, the interval time is between 1 second and 5000 seconds, for example, 5 seconds, 10 seconds, 50 seconds, 100 seconds, 500 seconds, 2000 seconds, 3000 seconds, 4000 seconds, 4900 seconds.
In this embodiment, the seam making effect can be judged through the pressure change of the wellhead. As shown in fig. 2, when the oxidizing agent and the reducing agent meet each other in the formation fracture, that is, at the time a when the oxidizing agent and the reducing agent start to contact, a chemical reaction occurs, the pressure in the formation rapidly rises, and the pressure reflected to the wellhead also rises; when the formation pressure exceeds the formation fracture pressure, namely the fracture initiation time B, a new fracture is generated in the formation, and at the moment, the formation pressure can be rapidly reduced and the pressure reflected to a wellhead can be reduced; and at the time C of finishing the seam making, the pressure of the wellhead is reduced to an initial value. The whole seam making process is a positive pulse change process from the ground fracturing.
And S6, manufacturing a complex seam net through second hydraulic fracturing.
In the embodiment, the injection capacity of the second hydraulic fracturing pump is 1-20 m 3 Min, e.g. 2m 3 /min、5m 3 /min、10m 3 /min、15m 3 /min、19m 3 Min; 50-1000 m of pump injection fracturing fluid 3 E.g. 60m 3 、100m 3 、500m 3 、600m 3 、800m 3 、900m 3 、950m 3 。
Exemplary embodiment 2
This exemplary embodiment is substantially the same as exemplary embodiment 1, except that the oxidizing agent is introduced into the main crack for a certain period of time and then the reducing agent is introduced, including the steps of:
s1, manufacturing a main fracture in the stratum in a hydraulic fracturing mode.
And S2, introducing an oxidizing agent with a certain volume into the main crack in a slug mode.
And S3, introducing fracturing fluid into the main crack.
And S4, introducing a certain volume of reducing agent into the main fracture after a period of time, mixing the reducing agent with the oxidizing agent distributed in the formation fracture after the reducing agent enters the formation, generating a rapid heating reaction and initiating explosion to generate fine fractures.
And S5, repeating the steps S2-S4 according to actual requirements, wherein a period of time is arranged between each repetition.
And S6, manufacturing a complex seam net through second hydraulic fracturing.
The present exemplary embodiment provides a reservoir fracture modification method including fracture modification of a hydrocarbon reservoir using the chemical reaction-based fracture creating method described in exemplary embodiment 1 or exemplary embodiment 2 above.
In conclusion, the invention can manufacture fine seam net in advance through chemical reaction explosion, creates conditions for manufacturing longer, wider and more complex seam net through hydraulic fracturing later, and greatly reduces the energy consumption of hydraulic fracturing seam making. The distribution state of the ground stress around the fracturing fluid in the stratum can be changed by chemical reaction explosion fracture making, and the fracture is prevented from extending along the direction of the maximum main stress all the time and a complex fracture network cannot be formed.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A fracturing and crack-making method based on chemical reaction is characterized by comprising the following steps:
s1, manufacturing a main fracture in a stratum in a hydraulic fracturing mode;
s2, introducing a certain volume of first chemical agent into the main crack in a slug mode;
s3, introducing fracturing fluid into the main crack;
s4, introducing a certain volume of second chemical agent into the main crack after a period of time, and after the second chemical agent enters the stratum and is mixed with the first chemical agent, rapidly generating heat to react and initiate explosion to generate fine cracks;
s5, repeating the steps S2-S4 according to actual requirements, wherein a period of time is arranged between each repetition;
s6, manufacturing a complex seam net through second hydraulic fracturing;
wherein when the first chemical is a reducing agent, the second chemical is an oxidizing agent; when the first chemical is an oxidizing agent, the second chemical is a reducing agent.
2. The chemical reaction-based fracturing and seam-making method of claim 1, wherein the reducing agent comprises one of glyceryl trinitrate, hydrocyanic acid, and phenol.
3. The chemical reaction-based fracturing and seam-making method of claim 1, wherein the oxidizer comprises one of hydrogen peroxide, potassium chlorate and potassium permanganate.
4. The fracturing and seam making method based on chemical reaction of claim 1, wherein the first chemical agent is introduced into the fracture and seam making device in a volume of 0.5-5 m per time 3 。
5. The chemical reaction-based fracturing and seam-making method according to claim 1, wherein the volume of the second chemical agent introduced per time is 0.5-5 m 3 。
6. The fracturing and crack-making method based on chemical reaction as claimed in claim 1, wherein the fracturing fluid comprises one of slick water and guar gum, and the amount of the fracturing fluid is 10-100 m per time 3 。
7. The chemical reaction-based fracturing and seam making method according to claim 1, wherein the time interval in the step S5 is 1 to 5000 seconds.
8. The fracturing and crack-making method based on chemical reaction as claimed in claim 1, wherein the pumping capacity of the main crack produced by hydraulic fracturing is 1-20 m 3 Min, pumping 10-100 m of fracturing fluid 3 (ii) a The injection displacement of the second hydraulic fracturing pump is 1-20 m 3 Min, pumping fracturing fluid 50-1000 m 3 。
9. The chemical reaction-based fracturing and seam-making method of claim 1, wherein the first chemical agent, the fracturing fluid and the second chemical agent are introduced by pumping.
10. A reservoir fracture reformation method, characterized in that the reservoir fracture reformation method comprises the chemical reaction-based fracture setting method according to any one of claims 1 to 9.
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|---|---|---|---|---|
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| US20170145295A1 (en) * | 2014-03-13 | 2017-05-25 | Halliburton Energy Services, Inc. | Methods of Enhancing and Generating Microfractures in Shale Formations |
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| CN113863912A (en) * | 2021-09-08 | 2021-12-31 | 西南石油大学 | Oxidation cracking method for creating complex fracture network of fracture gas reservoir |
-
2022
- 2022-09-21 CN CN202211151420.0A patent/CN115324552A/en active Pending
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| 吴晋军;: "低渗油层层内深度爆炸技术作用机理及工艺试验研究", 西安石油大学学报(自然科学版), no. 01, 25 January 2011 (2011-01-25) * |
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