CN111734384A - Liquid gunpowder deflagration fracturing method and application thereof - Google Patents
Liquid gunpowder deflagration fracturing method and application thereof Download PDFInfo
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- CN111734384A CN111734384A CN202010652511.7A CN202010652511A CN111734384A CN 111734384 A CN111734384 A CN 111734384A CN 202010652511 A CN202010652511 A CN 202010652511A CN 111734384 A CN111734384 A CN 111734384A
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- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 239000003721 gunpowder Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004200 deflagration Methods 0.000 title claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 67
- 239000007924 injection Substances 0.000 claims abstract description 67
- 239000002360 explosive Substances 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract 2
- 238000005474 detonation Methods 0.000 claims description 40
- 239000000843 powder Substances 0.000 claims description 24
- 239000003999 initiator Substances 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 239000000575 pesticide Substances 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 239000003380 propellant Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001965 increasing effect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- SOZVEOGRIFZGRO-UHFFFAOYSA-N [Li].ClS(Cl)=O Chemical compound [Li].ClS(Cl)=O SOZVEOGRIFZGRO-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to a deflagration fracturing method for solving the problems that after liquid gunpowder and isolating liquid are conveyed to a specified position to extract a tubular column, the liquid gunpowder, the isolating liquid and well liquid are mixed with each other to cause the ignition difficulty to be increased and the fracturing effect to be reduced by adopting a tubular column method twice for the conventional liquid gunpowder deflagration fracturing, and the deflagration fracturing method comprises the following steps: calculating the volume of the required liquid gunpowder according to the position to be unplugged; sequentially connecting an underground explosive injection device, an exploder and an ignition device to be conveyed to an underground position to be unblocked; sequentially driving isolation liquid, liquid gunpowder, isolation liquid and well killing liquid into a position to be unplugged through an underground explosive injection device; pressurizing to make part of liquid gunpowder enter into formation cracks; detonating a fracturing charge in a fracturing gun of an ignition device through a detonator according to preset pressure, temperature and time; and fracturing the stratum is realized. The fracturing method can be applied to fracture of a hole seam stratum, ultra-short radius horizontal wells and sidetracking wells.
Description
Technical Field
The invention relates to an explosion fracturing method, in particular to an explosion fracturing method of liquid gunpowder and application thereof.
Background
With the development of horizontal well pumping perforation technology, the completion technology is gradually changed from perforation completion to fracturing completion.
The fracturing well completion is characterized by deep fracture length, fracturing sand support and obvious yield increasing effect, but oil-water accumulation and waxy substances can block an oil-gas channel along with the passage of time, so that the productivity is reduced, and therefore, the blockage removal problem becomes the concern of the fracturing well completion technology. The traditional solid detonation fracturing can solve the problem of partial blockage, but also has the problems that the dosage cannot be improved, the combustion time of gunpowder is short, the gunpowder cannot enter the cracks and the like, and the blockage removing effect cannot meet the production requirement of an oil field, so that the liquid gunpowder detonation fracturing technology becomes a new development direction.
The existing liquid gunpowder explosion fracturing adopts two times of pipe columns, the first time of pipe columns conveys liquid gunpowder and isolating liquid to a designated position and then puts the pipe columns out, and the second time of pipe columns ignites.
Disclosure of Invention
The invention provides a liquid powder detonation fracturing method and application thereof, aiming at solving the technical problems that after liquid powder and isolating liquid are conveyed to a specified position to extract a pipe column, the liquid powder, the isolating liquid and well liquid are mixed with each other, so that the ignition difficulty is increased and the fracturing effect is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
the liquid powder detonation fracturing method is characterized by comprising the following steps:
s1, sequentially connecting an underground explosive injection device, an initiator and an ignition device, and sending the mixture to an underground position to be unplugged, wherein the ignition device is positioned at the farthest position from a wellhead underground;
the underground injection device comprises a front-section injection bin and a rear-section injection bin which are hermetically connected, wherein the front-section injection bin and the rear-section injection bin are both hollow columns with openings at two ends; a sliding sleeve is arranged in the front-section injection bin or the rear-section injection bin at one end of the front-section injection bin and the rear-section injection bin which are connected with each other, the inner part of the front-section injection bin and the inner part of the rear-section injection bin are separated by the sliding sleeve, and the sliding sleeve is connected with the front-section injection bin or the rear-section injection bin in a fitting manner through a shearing pin; a plurality of through holes are formed in the side wall of the rear-section injection bin, and the port of the front-section injection bin is positioned at the well mouth;
s2, sequentially pumping isolation liquid, liquid gunpowder, isolation liquid and well killing liquid into the front-section explosive injection bin;
s3, pressing to break the shear pin until the liquid explosive completely flows between the underground oil pipe and the sleeve through the through hole of the rear section explosive injection bin;
s4, connecting an oil pipe at the port of the front-section explosive injection bin, and pressurizing the underground through the oil pipe to enable part of the liquid explosive to enter a stratum fracture;
s5, detonating the fracturing explosive columns in the fracturing gun of the ignition device through the detonator;
and S6, igniting the liquid gunpowder entering the stratum fracture in the step S5 through a fracturing powder column to realize fracturing of the stratum.
Further, step S5 is specifically to detonate the fracturing charge in the fracturing gun of the ignition device by the detonator according to preset pressure, temperature and time;
the detonator comprises a detonation control unit, a high-temperature power supply unit, a temperature sensor, a pressure sensor and a detonator body;
the temperature sensor and the pressure sensor collect temperature signals and pressure signals of a position to be unplugged and send the temperature signals and the pressure signals to the detonation control unit;
the detonation control unit receives the temperature signal and the pressure signal, compares the temperature signal and the pressure signal with preset detonation information, and controls the working state of the detonator body according to a comparison result;
and the high-temperature power supply unit supplies power to the detonation control unit, the temperature sensor, the pressure sensor and the detonator body.
Further, the detonation control unit comprises a signal conditioning circuit and a single chip microcomputer;
the signal conditioning circuit receives the temperature signal and the pressure signal, performs amplification and filtering processing, and sends the processed temperature signal and the processed pressure signal to the single chip microcomputer;
and the single chip microcomputer compares the received pressure signal with preset detonation information and controls the working state of the detonator body according to the comparison result.
Further, the working state of the initiator body is controlled according to the comparison result, specifically, the on-off of an initiation circuit in the initiator is controlled according to the comparison result, and the working state of the initiator body is controlled.
Further, the liquid powder is suspension-shaped liquid powder.
In addition, the liquid powder detonation fracturing method can be applied to fracture of a hole stratum, ultra-short radius horizontal wells and side drilling.
Compared with the prior art, the invention has the beneficial effects that:
1. the deflagration fracturing method of the liquid gunpowder can realize the conveying and ignition of one string, and compared with the existing two strings, the deflagration fracturing method of the liquid gunpowder not only reduces the one string, but also obviously improves the fracturing effect and the ignition reliability; according to the invention, the underground explosive injection device is introduced, liquid explosive is accurately conveyed to a position to be unblocked through the underground explosive injection device, the liquid explosive is accurately conveyed to a position between an underground oil pipe and a sleeve through continuous pressurization, the liquid explosive is filled in a stratum crack under the pressurization, and then the fracturing is finished through the ignition of the initiator and the ignition device, so that the initiator can be initiated according to preset pressure, temperature and delay time, and the underground explosive injection device is safer and more accurate; in addition, liquid gunpowder is easier to enter bottom layer cracks, the burning speed is low, the near well can be prevented from being excessively broken, and the fracturing effect can be effectively improved on the premise of ensuring the safety of the casing; meanwhile, as the liquid gunpowder is easier to enter the gap, the fracturing method has wider applicability and can adapt to fracturing of different types of wells, particularly complex fractured wells.
2. The intelligent detonator is adopted, the temperature and pressure signals of the position to be unblocked can be detected, and when the pressure signals meet the preset pressure condition, the work of the detonator can be directly controlled through the detonation control unit, so that the control is more accurate, the safety is higher, and manual interference is not needed.
3. The working state of the detonator is controlled by the on-off of the detonating circuit, and the control method is simple and convenient and easy to realize.
4. The liquid gunpowder can also be suspension liquid gunpowder, is oil-resistant, water-resistant and high-temperature-resistant, can be prepared according to actual use requirements, and has stronger applicability and adjustability.
5. The invention adopts the liquid gunpowder blasting fracturing method, because the liquid gunpowder can enter the hole seam under the pressure effect, especially for larger holes, because the hole seam has larger volume, the pressure of the solid gunpowder can not meet the fracturing requirement, and the liquid gunpowder can enter the holes in large quantity to generate enough high-temperature high-pressure gas, thereby being effectively suitable for fracturing the hole seam stratum; in addition, for ultra-short radius horizontal wells and sidetracked wells, detonation fracturing can be realized by adopting a mode that a coiled tubing is connected with the underground main device.
Drawings
FIG. 1 is a schematic view of a downhole installation configuration when employing an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a downhole injection device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control structure of the initiator according to the embodiment of the present invention.
The system comprises a 1-underground explosive injection device, a 101-front-section explosive injection bin, a 102-sliding sleeve, a 103-shearing pin, a 104-through hole, a 105-rear-section explosive injection bin, a 2-detonator, a 3-ignition device, a 4-underground oil pipe and a 5-casing pipe.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments do not limit the present invention.
Referring to fig. 1 to 3, the invention provides a liquid powder detonation fracturing method, which comprises the steps of calculating and preparing the volume of required liquid powder according to a position to be unblocked, sequentially connecting a downhole explosive injection device 1, an initiator 2 and an ignition device 3 on a well, and then sending the mixture to the position to be unblocked underground, wherein the ignition device 3 faces inwards and is positioned at the farthest position from a wellhead in the well. Wherein, the underground injection device 1 comprises a front-section injection bin 101 and a rear-section injection bin 105 which are hermetically connected, the front-section injection bin 101 and the rear-section injection bin 105 are both hollow columns with openings at two ends, the specific shape and size can be adjusted and determined according to the specific underground condition, a sliding sleeve 102 is arranged between the inside of the front-section injection bin 101 and the inside of the rear-section injection bin 105, the inner part of the front-section injection bin 101 and the inner part of the rear-section injection bin 105 are separated by the sliding sleeve 102, the sliding sleeve 102 can be connected at the rear end of the front-section injection bin 101 or the front end of the rear-section injection bin 105, connected by a shear pin 103, a plurality of through holes 104 are arranged on the side wall of the rear section drug injection bin 101, the underground oil pipe 4 is communicated with the sleeve 5, the sleeve 5 is communicated with the base layer, the port of the front-section pesticide injection bin is positioned at the wellhead, the front-section pesticide injection bin 101 is pressed, when the pressure reaches a certain value, the shear pin 103 will be cut off, so that the sliding sleeve 102 will slide off.
The isolation liquid, the liquid gunpowder, the isolation liquid and the well killing liquid are sequentially conveyed to the front-section explosive injection bin 101 by a cement truck, the shear pin 103 is cut off by pressurizing, the sliding sleeve 102 slides down, the mixed liquid enters the rear-section explosive injection bin 105, and can smoothly enter between the underground oil pipe 4 and the sleeve pipe 5 through the through hole 104 in the side wall of the rear-section explosive injection bin 105 and is upwards discharged. An oil pipe is connected to a port of the front-section explosive injection bin 101, partial liquid gunpowder enters a stratum crack by pressurization at a wellhead through the oil pipe, then the intelligent detonator 2 detonates a fracturing explosive column according to set pressure, temperature and time, the fracturing explosive column is installed in a fracturing gun of the ignition device, the burning fracturing explosive column ignites surrounding liquid gunpowder through a through hole of the fracturing gun, and high-temperature and high-pressure gas generated by the liquid gunpowder induces the liquid gunpowder in the stratum, so that the stratum is efficiently fractured.
The detonator 2 is an intelligent detonator and comprises a detonation control unit, a high-temperature power supply unit, a temperature sensor, a pressure sensor and a detonator body. The temperature sensor and the pressure sensor acquire a temperature signal and a pressure signal of a position to be unblocked and send the temperature signal and the pressure signal to the detonation control unit; the detonation control unit comprises a signal conditioning circuit and a single chip microcomputer, the signal conditioning circuit receives a temperature signal and a pressure signal, performs amplification and filtering processing, sends the processed temperature signal and the processed pressure signal to the single chip microcomputer, the single chip microcomputer compares the received pressure signal with preset detonation information, controls the on-off of a detonation circuit in the detonator according to a comparison result, and further controls the working state of the detonator body; the high-temperature power supply unit supplies power to the detonation control unit, the temperature sensor, the pressure sensor and the detonator body. The initiator 2 can set initiation information, read collected data and compare and analyze the data through matched service software. When detonation is needed, ground workers perform pressurization operation on the interior of an oil pipe through a pump truck, when the detonation information conforms to the preset detonation information, the judgment is successful, a detonation control unit outputs a detonation signal, a detonation circuit is connected in a break-make mode, a detonator works, a fracturing explosive column is detonated, and the fracturing explosive column ignites surrounding liquid gunpowder. The high-temperature power supply unit can adopt a high-temperature power supply, can resist temperature of 150 ℃/48h, adopts an R34615 lithium thionyl chloride power type battery pack, and is connected with 8 batteries in series, and the power supply voltage is 24V.
Because the stratum and the annulus are communicated when in fracturing, the oil pipe is communicated with the annulus through the through hole on the explosive injection device, and the internal and external pressurization of the oil pipe can not reliably detonate, the special intelligent detonator is provided for the application,
the liquid powder can be pure liquid powder or suspension-shaped liquid powder, the suspension-shaped powder is composed of solid particles and liquid, the solid particles are generally coated by the liquid powder, the solid powder or paste powder, the oil resistance, the water resistance and the high temperature resistance are realized, and the solid particles and the liquid can be formed according to different proportions according to requirements.
The invention can not only be applied to the stratum of fracturing well completion, but also be suitable for the stratum with hole seams, liquid gunpowder can enter the hole seams, especially larger holes, because the hole seams have larger volume, the pressure of solid gunpowder can not meet the pressure requirement of normal fracturing, and liquid gunpowder can enter a large amount of holes to generate enough high-temperature high-pressure gas, thereby achieving the pressure of communication between the holes and realizing the reliable fracturing of the hole rock. For an ultra-short radius horizontal well or a lateral well, a coiled tubing can be connected with the structure of the invention, so that deflagration fracturing of the ultra-short radius horizontal well or the lateral well which cannot be passed by a conventional tubing is realized.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A liquid powder detonation fracturing method is characterized by comprising the following steps:
s1, sequentially connecting the underground explosive injection device (1), the detonator (2) and the ignition device (3), and sending the mixture to an underground position to be unblocked, wherein the ignition device (3) is located at the farthest position in the well from a wellhead;
the underground injection device (1) comprises a front-section injection bin (101) and a rear-section injection bin (105) which are connected in a sealing manner, wherein the front-section injection bin (101) and the rear-section injection bin (105) are both hollow columns with two open ends; a sliding sleeve (102) is arranged inside the front-section injection bin (101) or inside the rear-section injection bin (105) at one end, which is connected with the front-section injection bin (101) and the rear-section injection bin (105), the sliding sleeve (102) separates the inside of the front-section injection bin (101) from the inside of the rear-section injection bin (105), and the sliding sleeve (102) is attached and connected with the front-section injection bin (101) or the rear-section injection bin (105) through a shearing pin (103); a plurality of through holes (104) are formed in the side wall of the rear-section pesticide injection bin (101), and the port of the front-section pesticide injection bin is positioned at the well mouth;
s2, sequentially driving isolation liquid, liquid gunpowder, isolation liquid and well killing liquid into the front-section explosive injection bin (101);
s3, the shear pin (103) is broken by pressing until the liquid gunpowder completely flows between the underground oil pipe (4) and the sleeve (5) through the through hole (104) of the rear-section gunpowder injection bin (105);
s4, connecting an oil pipe at the port of the front-section explosive injection bin (101), and pressurizing the underground through the oil pipe to enable part of liquid explosive to enter a stratum fracture;
s5, detonating the fracturing explosive columns in the fracturing gun of the ignition device (3) through the detonator (2);
and S6, igniting the liquid gunpowder entering the stratum fracture in the step S5 through a fracturing powder column to realize fracturing of the stratum.
2. A liquid powder detonation fracturing method as claimed in claim 1, wherein:
step S5 is specifically that a blasting charge in a fracturing gun of an ignition device (3) is blasted through a blasting machine (2) according to preset pressure, temperature and time;
the detonator (2) comprises a detonation control unit, a high-temperature power supply unit, a temperature sensor, a pressure sensor and a detonator body;
the temperature sensor and the pressure sensor collect temperature signals and pressure signals of a position to be unplugged and send the temperature signals and the pressure signals to the detonation control unit;
the detonation control unit receives the temperature signal and the pressure signal, compares the temperature signal and the pressure signal with preset detonation information, and controls the working state of the detonator body according to a comparison result;
and the high-temperature power supply unit supplies power to the detonation control unit, the temperature sensor, the pressure sensor and the detonator body.
3. A liquid powder detonation fracturing method as claimed in claim 2, wherein: the detonation control unit comprises a signal conditioning circuit and a single chip microcomputer;
the signal conditioning circuit receives the temperature signal and the pressure signal, performs amplification and filtering processing, and sends the processed temperature signal and the processed pressure signal to the single chip microcomputer;
and the single chip microcomputer compares the received pressure signal with preset detonation information and controls the working state of the detonator body according to the comparison result.
4. A liquid powder detonation fracturing method as claimed in claim 3, wherein: and controlling the working state of the initiator body according to the comparison result, specifically, controlling the on-off of an initiation circuit in the initiator according to the comparison result, and controlling the working state of the initiator body.
5. A liquid powder detonation fracturing method as claimed in any one of claims 1 to 4, wherein: the liquid gunpowder is suspension liquid gunpowder.
6. Use of a liquid propellant deflagration fracturing method according to any one of claims 1 to 5 in fracturing of a fractured formation.
7. Use of the liquid powder detonation fracturing method of any of claims 1 to 5 in ultra short radius horizontal wells.
8. Use of a liquid charge deflagration fracturing method as defined in any one of claims 1 to 5 in sidetracking wells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010652511.7A CN111734384A (en) | 2020-07-08 | 2020-07-08 | Liquid gunpowder deflagration fracturing method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010652511.7A CN111734384A (en) | 2020-07-08 | 2020-07-08 | Liquid gunpowder deflagration fracturing method and application thereof |
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| CN111734384A true CN111734384A (en) | 2020-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012897A (en) * | 2022-06-29 | 2022-09-06 | 西南石油大学 | Method for improving shale oil recovery ratio |
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| US4223734A (en) * | 1978-11-09 | 1980-09-23 | Geokinetics Inc. | Process of breaking and rendering permeable a subterranean rock mass |
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| CN105201483A (en) * | 2015-09-22 | 2015-12-30 | 中北大学 | Environment-friendly downhole stratum fracturing method |
| CN110965979A (en) * | 2019-10-24 | 2020-04-07 | 中国石油大学(华东) | Deep combustion and explosion fracturing method in radial slim hole |
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2020
- 2020-07-08 CN CN202010652511.7A patent/CN111734384A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4223734A (en) * | 1978-11-09 | 1980-09-23 | Geokinetics Inc. | Process of breaking and rendering permeable a subterranean rock mass |
| CN1182166A (en) * | 1997-12-23 | 1998-05-20 | 杨学政 | Efficient gas fracturing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115012897A (en) * | 2022-06-29 | 2022-09-06 | 西南石油大学 | Method for improving shale oil recovery ratio |
| CN115012897B (en) * | 2022-06-29 | 2023-11-21 | 西南石油大学 | Method for improving shale oil recovery ratio |
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