CN104929605B - Underground hydraulic pulse staged fracturing and permeability increasing device and method - Google Patents
Underground hydraulic pulse staged fracturing and permeability increasing device and method Download PDFInfo
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- CN104929605B CN104929605B CN201510362127.2A CN201510362127A CN104929605B CN 104929605 B CN104929605 B CN 104929605B CN 201510362127 A CN201510362127 A CN 201510362127A CN 104929605 B CN104929605 B CN 104929605B
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Abstract
The invention provides a device and a method for increasing permeability of underground hydraulic pulse staged fracturing. The fracturing truck is connected with a controllable hydraulic packer and an underground pulse fracturing device through a coiled tubing, the controllable hydraulic packer is connected to the rear end of the underground pulse fracturing device, and a fluid control valve is arranged at the joint of the coiled tubing. The underground pulse fracturing device comprises a cylinder body I, a cylinder body II, a mandrel, a sliding sleeve, a sealing ring, a spring, a nozzle and the like. The invention can generate pulse fluid injection with large displacement and low frequency at the bottom of the well to form water hammer effect under the condition that the ground fracturing truck provides certain construction parameters such as pumping pressure, displacement and the like. The invention has simple structure, durability, easy adjustment, simple construction process, capability of generating low-frequency and large-displacement pulse energy, capability of well utilizing the pulse energy to break rocks, generation of reticular complex cracks with wider extension range and effective improvement of reservoir permeability.
Description
Technical field
The present invention relates to the apparatus and method that a kind of underground produces low frequency, huge discharge, high-energy waterpower pulse energy, should
For shale reservoir or other similar reservoir volume fracturing reforms.
Background technology
China's non-conventional gas resource reserve is abundant, potentiality to be exploited is big, and particularly shale gas, coal bed gas have wide exploitation
Prospect.But shale gas, coalbed methane reservoir have, and porosity is low, the low feature of permeability, generally requires and transformation is subject to reservoir obtains
Obtain commercial development.At present, hydraulic fracturing technology is that high efficiency, low cost develops one of shale gas, key technology of coal bed gas, together
When there is also the bottleneck problems such as water loss is big, capacity usage ratio is low, fracture network communication effectiveness is undesirable.Waterpower pulse pressure
It is a kind of shale reservoir reconstruction new method to split, and efficiently can be carried with the water hammer effect and CYCLIC LOADING mode of high-energy waterpower pulse
The correctional effect of reservoir high.Under the background and environmental protection pressure of China's water resources shortage, the practical pulse generation dress in underground is developed
Put, set up corresponding shale gas waterpower pulse pressure break new method and seem most important.
Conventional hydraulic pressure break is mainly by adjusting ground fracturing car pump pressure, fracturing rock, Ran Houwei under high pump pressure
The big quantity of fluid of certain pressure infusion is held, makes fracture extension.The use of waterpower pulse fracturing reform shale gas reservoir is a kind of new changing
Reservoir method is made, is produced in underground and is had that " water hammer effect " strong, pulse using the pulse of low frequency, huge discharge, high-energy
Energy attenuation is slow, CYCLIC LOADING etc. applies load feature, can be under relatively low pressure condition with conventional hydraulic pressure break compared with, and formation is more
Complicated fracture network, increases effective fracture volume and connecting degree, reaches raising shale gas reservoir hydrfracturing correctional effect
Purpose.
At present, both at home and abroad for the hydraulic fracturing of shale reservoir, mainly using stable state infusion hydraulic fracturing, when needs one
It is that pulsatile effect is reached by adjustably face-pumping when determining pulse energy, but the pulse ability major part for so producing is all by well
Fracturing fluid in cylinder and reservoir is consumed, and the real pulse energy for being used for fracturing rock accounts for a little part, and effect is undesirable.It is logical
Cross the research of domestic and international hydraulic fracturing and compare, discovery is had following excellent using the hydraulic fracturing of downhole hydraulic pulse fracturing tool
Point：
1. low frequency, huge discharge waterpower pulse energy can be produced in underground, pressure surge has that decay is slow, propagate away from
Away from, crest, trough stabilization time it is long, the features such as transit time is short between crest and trough, pressure jump is rapid.Will not with
The waterpower pulse energy of ground generation is the same to be consumed by fracturing fluid, reduces hydraulic energy consumption.
2. high pressure fracture liquid can be converted to huge discharge, low frequency pulse pressure by downhole hydraulic pulse fracturing device in underground
Liquid is split, underground " water hammer effect " is formed in reservoir, high impact forces pressure break reservoir meets directional fracturing reservoir needs.
At present, both at home and abroad also not specifically designed for the waterpower pulse fracturing process of shale reservoir.
The content of the invention
The present invention provides a kind of downhole hydraulic pulse segment pressure break anatonosis device and method, can be used in shale reservoir, coal
Layer or other reservoir hydrfracturings, produce orientation low frequency, high amplitude, huge discharge, pressure break peak valley snap time short in underground
Waterpower pulse energy, and corresponding waterpower pulse fracturing device method.
The technical solution adopted for the present invention to solve the technical problems is：
It is present invention firstly provides downhole hydraulic pulse segment pressure break anatonosis device including underground pulse fracturing device, controllable
Formula hydraulic packer, coiled tubing, control valve for fluids and fracturing unit truck.The fracturing unit truck connects underground pulse pressure by coiled tubing
Device and controllable hydraulic packer are split, controllable hydraulic packer is connected to underground pulse fracturing device rear end, coiled tubing
The interface being connected with fracturing unit truck sets control valve for fluids.
The downhole hydraulic pulse fracturing device includes cylinder body one, cylinder body two, mandrel, sliding sleeve, sealing ring, spring, nozzle
And joint；The rear end of the cylinder body one is connected with the front end of cylinder body two using trapezoidal round thread, and there are sliding sleeving hole, preceding end seal in the center of cylinder body one
Close, nozzle is radially provided with the side wall of sliding sleeving hole, the through hole of front and rear insertion is provided with cylinder body two；The mandrel has centre bore,
Open rearward end, is passed through fluid, and front bottom end sealing, front end circumferential wall is arranged symmetrically the fluid issuing of radial direction；Mandrel passes through cylinder body two,
Rear end is fixed with cylinder body two by nut, and is connected with coiled tubing by joint, front end exterior sliding sleeve, and is filled together with sliding sleeve
Enter in the sliding sleeving hole of cylinder body one, sliding sleeve is inside and outside to be sealed with mandrel and cylinder body one respectively；The sliding sleeve rear end has more than cylinder body
The convex shoulder in one aperture, when extreme position is slided into forward, convex shoulder lower surface is fitted with the aperture end face of cylinder body one, in row backward to pole
During extreme position, the convex shoulder with the inwall of cylinder body two offsets；Sliding sleeve front end external diameter reduce, formed step, the inwall of cylinder body one have with
Its step for coordinating, distance of the distance of the front end face of sliding sleeve away from cascaded surface less than or equal to the nozzle on cylinder body one away from step；
Mandrel section in cylinder body two is outer equipped with spring, and lower spring end is pressed in the convex shoulder upper surface of sliding sleeve, and upper end withstands on the interior of cylinder body two
On wall, sliding sleeve can form the water of stepped ripple on mandrel by the effect slide anteroposterior of compression spring, packing or closing nozzle
Power impulse jet.
Sliding sleeve slide up and down frequency and nozzle ejecting fluid pressure be pumped by reasonable selection spring performance parameter, ground,
(area, jet size and length, nozzle and fluid issuing position are come true for sliding sleeve length, sliding sleeve front end face area, sliding sleeve cascaded surface
It is fixed.
Wherein sliding sleeve stroke l is determined by formula (1)：
Spring rate n is determined by formula (2)：
Sliding sleeve eigenfrequency f is determined by formula (3)：
Whole waterpower pulse fracturing device frequency K is determined by formula (4)：
In upper four formula, K is waterpower pulse fracturing device frequency, and f is sliding sleeve eigenfrequency, and M is sliding sleeve quality, and n is bullet
Spring rigidity, S is sliding sleeve stepped locations floor space, and ρ is fracturing fluid density, and η is the resistance coefficient of fracturing fluid flowing, and l is sliding sleeve (3)
Stroke, p1Sliding sleeve rear end pressure, p before being opened for nozzle2End pressure after sliding sleeve after being opened for nozzle.
Based on apparatus above, present invention further propose that a kind of downhole hydraulic pulse fracturing process, comprise the following steps：
1st, wellbore treatments：Using jack rabbit drifting, while using flushing fluid circulation well cleanup.
2nd, perforation：After pit shaft reaches perforation requirement, perforation is carried out to fracturing section according to perforating design requirement.
3rd, controllable hydraulic packer is set：Coiled tubing connects pressure break controllable hydraulic packer and well by setup program
Lower waterpower pulse fracturing device and school depth, well head are suppressed, and set controllable hydraulic packer, the spray of downhole hydraulic pulse fracturing device
Mouth is towards perforated interval.
4th, first paragraph pressure break：Conversion surface fluids control valve, starts downhole hydraulic pulse fracturing device, and fluid is from oil pipe stream
Enter mandrel, from fluid issuing outflow, enter into cylinder body one, because the lower end of cylinder body one is sealing device, fluid is sprained in cylinder body one
Pressure, produces high pressure so that there is pressure difference between sliding sleeve upper and lower side, and thrust is produced at sliding sleeve front end face, promotes row after sliding sleeve, together
When compression spring；When line position is put more than nozzle after sliding sleeve cascaded surface, fracturing fluid flows out from nozzle, and high pressure fracture liquid is let out simultaneously
Pressure；Because inertia and pressure differential are acted on, the sliding sleeve also segment distance of row one after the meeting, when sliding sleeve leading portion pressure is less than spring restoring force,
Spring starts to promote sliding sleeve to move ahead, and the cascaded surface packing nozzle of sliding sleeve, fracturing fluid stops spraying；When spring restoring force is less than pressure break
Hydraulic coupling or sliding sleeve are reached when at the stepped locations of cylinder body one, and sliding sleeve stops descending, the up action of repetition.Thus device produces pulse
Fluid, while adjusting pressure and discharge capacity, the size that control underground pulse energy is produced by bottom surface, you can produce expected water hammer
Effect, reaches the effect of pressure break reservoir.Constructed by pressure break operational procedure, ground monitoring construction effect reaches pre-provisioning request, the section
Waterpower pulse pressure break terminates.
5th, controllable hydraulic packer is unsealed：After first paragraph pressure break terminates, ground release, deblocking controllable hydraulic packing
Device.
6th, second segment pressure break：Complete first paragraph pressure break and after unsealing controllable hydraulic packer, pump into bridging plug to specific bit
Put, if downhole hydraulic pulse fracturing device or controllable hydraulic packer need to be changed, above carry all tubing strings to replaced on ground；
If a cutting tool is normal, after perforation, fracturing string is transferred, downhole hydraulic pulse fracturing device is located at the second pressure of pressure break
Split section；Suppressed again by ground and set controllable hydraulic packer, then carry out second segment pressure break according to FRACTURING DESIGN requirement.
7th, remaining interval pressure break：Step carries out remaining interval pressure break in repetition, while noting per 3-5 sections of pressure break, it is necessary to examine
Repair or change and set controllable hydraulic packer, downhole hydraulic pulse fracturing device.
The beneficial effects of the invention are as follows：Can be when underground produces low frequency, huge discharge, high amplitude, pressure break peak valley step
Between short waterpower pulse energy, formed " water hammer effect ".Waterpower pulse energy can be such that shale Reservoir Fracture extends more extensively, more
Far, increase fracture penetration and connecting degree, form complex fracture net, be more likely formed volume fracturing effect.
Brief description of the drawings
Fig. 1 is the construction technology schematic diagram of downhole hydraulic pulse segment pressure break anatonosis device of the invention.
Fig. 2 is the sectional view of wherein waterpower pulse fracturing device.
Fig. 3 is the sliding sleeve sectional view of waterpower pulse fracturing device.
Fig. 4 is the mandrel front view of waterpower pulse fracturing device.
Fig. 5 is the fluid issuing sectional view of waterpower pulse fracturing device mandrel.
In figure, 1- cylinder bodies one, 2- mandrels, 3- sliding sleeves, 4- nozzles, 5- sealing rings one, 6- sealing rings two, 7- cylinder bodies two, 8-
Spring, 9- joints, 10- fluid issuings, 11- pressure-break nets, 12- bridging plugs, 13- undergrounds pulse fracturing device, 14- controllable hydraulics
Packer, 15- coiled tubings, 16- fracturing unit trucks, 17- sliding sleeve front end faces, 18- sliding sleeve cascaded surfaces.
Specific embodiment
Above-mentioned is only the general introduction of technical solution of the present invention, in order to better understand technological means of the invention, below
With reference to accompanying drawing, the present invention is described in further detail with specific embodiment.
Refering to Fig. 1, downhole hydraulic pulse segment pressure break anatonosis device includes underground pulse fracturing device 13, controllable hydraulic
Packer 14, coiled tubing 15, control valve for fluids and fracturing unit truck 16.Fracturing unit truck 16 connects underground pulse pressure by coiled tubing 15
Device 13 and controllable hydraulic packer 14 are split, controllable hydraulic packer 14 is arranged in the rear end of underground pulse fracturing device 13,
The interface of coiled tubing 15 sets control valve for fluids.
Refering to Fig. 2-Fig. 5, pulse fracturing device in underground is main by sliding sleeve 3, mandrel 2, cylinder body 1, cylinder body 27, compression bullet
The grade of spring 8 is constituted.
Connected using trapezoidal round thread between cylinder body 1 and cylinder body 27.There is sliding sleeving hole at the center of cylinder body 1, and front end is closed,
Nozzle 4 is radially provided with the side wall of sliding sleeving hole.The through hole of front and rear insertion is provided with cylinder body 27.Mandrel 2 has centre bore, rear end
Opening, is passed through fluid, and front bottom end sealing, front end circumferential wall is arranged symmetrically 4 fluid issuings of radial direction 10.Mandrel 2 passes through cylinder body
27, rear end is fixed with cylinder body 27 by nut, and is connected with coiled tubing by joint 9, front end exterior sliding sleeve 3, and with cunning
Set is put into the sliding sleeving hole of cylinder body 1 together, and sliding sleeve is inside and outside to be sealed with mandrel and cylinder body one respectively, sealing ring 1 and close
Seal 26 is " M " type sealing ring.There is the convex shoulder more than the aperture of cylinder body 1 rear end of sliding sleeve 3, convex when extreme position is slided into forward
Shoulder lower surface is fitted with the aperture end face of cylinder body 1, and when row is to extreme position backward, the convex shoulder with the inwall of cylinder body 27 offsets；It is sliding
The reduction of 3 front end external diameters is covered, step is formed, the inwall of cylinder body 1 has the step coordinated with it, and the front end face 17 of sliding sleeve 3 is away from rank
Distance of the distance of tread 18 less than or equal to the nozzle on cylinder body 1 away from step；2 sections of the mandrel in cylinder body 27 is equipped with outward
Spring 8, the lower end of spring 8 is pressed in the convex shoulder upper surface of sliding sleeve, and upper end is withstood on the inwall of cylinder body 27, and sliding sleeve 3 can be on mandrel 2
By the effect slide anteroposterior of compression spring 8, nozzle 4 is insulated or closed, form the waterpower pulse injection of stepped ripple.
Downhole hydraulic pulse fracturing device operation principle is：The fracturing fluid that ground pumps into enters mandrel 2 by joint 9, from
Fluid issuing 10 is flowed out, and enters into cylinder body 1, and because the lower end of cylinder body 1 is sealing device, pressure of being sprained in cylinder body 1 is produced high
Pressure.So that there is pressure difference between the upper and lower side of sliding sleeve 3, and at sliding sleeve front end face 17, thrust is produced, promote sliding sleeve 3 up, while pressure
Contracting spring 8.When the upward position of sliding sleeve cascaded surface 18 exceedes nozzle 4, fracturing fluid flows out from nozzle 4, and high pressure fracture liquid is let out simultaneously
Pressure.Because inertia and pressure differential are acted on, sliding sleeve 3 can also a up segment distance, when the hypomere pressure of sliding sleeve 3 is less than the restoring force of spring 8
When, spring 8 starts to promote sliding sleeve 3 descending, and the packing nozzle 4 of sliding sleeve 3, fracturing fluid stops spraying.When the restoring force of spring 3 is less than pressure break
Hydraulic coupling or sliding sleeve 3 are reached when at the stepped locations of cylinder body 1, and sliding sleeve 3 stops descending, the up action of repetition, forms stepped ripple
Waterpower pulse energy, reach " water hammer effect " pressure break reservoir effect.
In order to determine the sliding frequency of sliding sleeve 3, pulse generation frequency, pulse fracturing fluid discharge capacity and form effective " water hammer effect
Should ", need to be by calculating and the rational parameter of spring 8 of analog selection, the length of sliding sleeve 3, the area of sliding sleeve front end face 17, sliding sleeve cascaded surface
18 areas, the size of nozzle 4 and length, nozzle 4 and the position of fluid issuing 10, and coordinate suitable ground to be pumped.Its rank for being formed
Scalariform waterpower pulse energy wave, can reach crest, trough stabilization time segment length, and transit time is short between crest and trough, pressure
Mutation is rapid, plays the effect to form " water hammer effect ".
A kind of application method of downhole hydraulic pulse fracturing device of the present invention, mainly includes the following steps that.
Step 1, wellbore treatments：Refering to Fig. 1, well cementation terminates, with scraper and gauguste cutter scrapings drifting, when preventing lower instrument
It is hampered, then with flushing fluid or clear water, well-flushing prevents from entering stratum during debris pressure break in pit shaft to clean, pollutes reservoir.
Step 2, perforation：After pit shaft reaches perforation requirement, perforation is carried out to fracturing section according to perforating design requirement.
Step 3, instrument is connected and enters well：Controllable hydraulic packer and downhole hydraulic pulse pressure break are connected on the ground
Device, using coiled tubing interval of interest in controllable hydraulic packer and downhole hydraulic pulse fracturing device feeding well.
Step 4, sets controllable hydraulic packer：Coiled tubing connects pressure break controllable hydraulic packer by setup program
With downhole hydraulic pulse fracturing device and school depth, downhole hydraulic pulse fracturing device nozzle is towards perforated interval.Oil pipe is suppressed, and is set
Controllable hydraulic packer.
Step 5, after the completion of controllable hydraulic testing seal about packer, conversion surface fluids control valve starts downhole hydraulic pulse
Fracturing device produces pulsed flow.Geostatic pressure and discharge capacity are adjusted simultaneously, and control underground pulse energy produces size, reaches expection
" water hammer effect " effect.Constructed by pressure break operational procedure, ground monitoring construction effect reaches pre-provisioning request, this section of waterpower pulse
Pressure break terminates.
Step 6, unseals controllable hydraulic packer：After first paragraph pressure break terminates, before next section of pressure break, sealed formula liquid is solved
Pressure packer.Check or change downhole hydraulic pulse fracturing device 13 or the reliability of controllable hydraulic packer 14.
Step 7, pumps into bridging plug, after first paragraph pressure break terminates, pumps into bridging plug 12 to specified location, and depth sounding, pressure testing.
Step 8, by design requirement perforation, well-flushing, after the completion of, fracturing string is transferred, make downhole hydraulic pulse fracturing device
13 the second fracturing sections for being located at pressure break；Suppressed again by ground and set controllable hydraulic packer 14, then set according to pressure break
Meter requirement carries out second segment pressure break.
Step 9, repeat step 2-8 carries out remaining interval pressure break, while noting per 3-5 sections of pressure break, it is necessary to which maintenance is changed
Set controllable hydraulic packer, downhole hydraulic pulse fracturing device.
Step 9 is, it is necessary to the interval pressure break completion of pressure break, deblocking controllable hydraulic packer 14, take out coiled tubing 15, well
Lower waterpower pulse fracturing device 13, using coiled tubing 15 and brill plug equipment, bores bridging plug 12, and pressure break terminates.
Claims (3)
1. a kind of downhole hydraulic pulse segment pressure break anatonosis device, including downhole hydraulic pulse fracturing device, controllable hydraulic envelope
Every device, coiled tubing, control valve for fluids and fracturing unit truck；It is characterized in that：The fracturing unit truck connects mine water by coiled tubing
Power pulse fracturing device and controllable hydraulic packer, after controllable hydraulic packer is connected to downhole hydraulic pulse fracturing device
End, the interface that coiled tubing is connected with fracturing unit truck sets control valve for fluids；
The downhole hydraulic pulse fracturing device includes cylinder body one (1), cylinder body two (7), mandrel (2), sliding sleeve (3), sealing ring, bullet
Spring (8), nozzle (4) and joint (9)；The rear end of the cylinder body one (1) is connected with the front end of cylinder body two (7) using trapezoidal round thread, cylinder
There is sliding sleeving hole at the center of body one (1), and front end closing is radially provided with nozzle (4), before being provided with cylinder body two (7) on the side wall of sliding sleeving hole
The through hole of insertion afterwards；The mandrel (2) is passed through fluid, front bottom end sealing, front end circumferential wall pair with centre bore, open rearward end
Claim the fluid issuing (10) of arrangement radial direction；Mandrel (2) is fixed with cylinder body two (7) through cylinder body two (7), rear end by nut, and
It is connected with coiled tubing by joint (9), front end exterior sliding sleeve (3), and the sliding sleeving hole of cylinder body one (1) is put into together with sliding sleeve
In, sliding sleeve is inside and outside to be sealed with mandrel and cylinder body one respectively；Sliding sleeve (3) rear end has convex more than the aperture of cylinder body one (1)
Shoulder, when extreme position is slided into forward, convex shoulder lower surface is fitted with the aperture end face of cylinder body one (1), in row backward to extreme position
When, the convex shoulder with the inwall of cylinder body two (7) offsets；Sliding sleeve (3) front end external diameter reduces, and forms step, and the inwall of cylinder body one (1) has
The step coordinated with it, the distance of the front end face (17) of sliding sleeve (3) away from cascaded surface (18) is less than or equal to the spray on cylinder body one (1)
Distance of the mouth away from step；Spring (8) is housed, spring (8) lower end is pressed in the convex of sliding sleeve outside mandrel (2) section in cylinder body two (7)
Shoulder upper surface, upper end is withstood on the inwall of cylinder body two (7), and sliding sleeve (3) can be on mandrel (2) by the effect of compression spring (8)
Slide anteroposterior, opens or closes nozzle (4), forms the waterpower pulse injection of stepped ripple.
2. downhole hydraulic pulse segment pressure break anatonosis device according to claim 1, it is characterised in that downhole hydraulic pulse
The structural parameters of fracturing device meet claimed below：
Sliding sleeve stroke l, sliding sleeve eigenfrequency f, waterpower pulse fracturing device frequency K are determined using following formula：
Wherein M is sliding sleeve quality, and n is spring rate, and S is sliding sleeve stepped locations floor space, and ρ is fracturing fluid density, and η is fracturing fluid
The resistance coefficient of flowing, l is sliding sleeve stroke, p1Sliding sleeve rear end pressure, p before being opened for nozzle2Side pressure after sliding sleeve after being opened for nozzle
Power.
3. the device according to usage right requires any one in 1-2 carries out waterpower pulse fracturing reform shale gas reservoir
Method, it is characterised in that comprise the following steps：
A, drifting, interval of interest perforation, perforation terminate, and well-flushing；
B, coiled tubing (15) connect controllable hydraulic packer (14), downhole hydraulic pulse fracturing device (13), are lowered into and set
Meter interval of interest and school depth, set controllable hydraulic packer (14)；
C, controllable hydraulic packer (14) are tested after the completion of envelope, conversion surface fluids control valve, start downhole hydraulic pulse pressure break
Device (13), fracturing fluid flows into mandrel (2) from oil pipe, from fluid issuing (10) outflow, cylinder body one (1) is entered into, due to cylinder body
One (1) lower end is sealing device, and fluid is sprained pressure in cylinder body one (1), produces high pressure so that exists between sliding sleeve (3) upper and lower side and presses
Difference, and thrust is produced at sliding sleeve front end face (17) place, sliding sleeve (3) row afterwards is promoted, while compression spring (8)；When sliding sleeve cascaded surface
(18) line position is put during more than nozzle (4) afterwards, and fracturing fluid flows out from nozzle (4), the pressure release simultaneously of high pressure fracture liquid；Due to inertia and pressure
Power difference effect, sliding sleeve (3) the also segment distance of row one after the meeting, when sliding sleeve (3) leading portion pressure is less than spring (8) restoring force, spring (8)
Start to promote sliding sleeve (3) to move ahead, the cascaded surface (18) of sliding sleeve insulates nozzle (4), and fracturing fluid stops spraying；When spring (3) recovers
Power is reached when at the stepped locations of cylinder body one (1) less than pressure break hydraulic coupling or sliding sleeve (3), and sliding sleeve (3) stops descending, action in repetition
Make；Thus device produces pulsed flow, while adjusting pressure and discharge capacity by ground, it is big that control underground pulse energy is produced
It is small, you can to produce expected water hammer effect, reach the effect of pressure break reservoir；
D, constructed by pressure break operational procedure, ground monitoring construction effect reaches pre-provisioning request, and this section of waterpower pulse pressure break terminates；
E, this section of pressure break terminate, deblocking controllable hydraulic packer (14), take out coiled tubing (15), downhole hydraulic pulse pressure break
Device (13), controllable hydraulic packer (14)；
F, pump into bridging plug (12) to specified location, repeat step A-E, pressure break second segment；
G, repeat step A-F, pressure break residue interval, and note per 3-5 sections of pressure break, it is necessary to controllable hydraulic packing is changed in maintenance
Device, downhole hydraulic pulse fracturing device；
H, all fracturing section pressure breaks terminate, and form pressure-break net (11), take out underground fracture tubing string and instrument, use coiled tubing
(15), with bench drill plug equipment, continuous to bore bridging plug (12), pressure break terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510362127.2A CN104929605B (en) | 2015-06-26 | 2015-06-26 | Underground hydraulic pulse staged fracturing and permeability increasing device and method |
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| CN201510362127.2A CN104929605B (en) | 2015-06-26 | 2015-06-26 | Underground hydraulic pulse staged fracturing and permeability increasing device and method |
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| CN114922599B (en) * | 2022-04-19 | 2023-03-24 | 中国矿业大学 | Pulse frequency control method for realizing efficient hydraulic fracturing of rock stratum |
| CN115126466B (en) * | 2022-08-09 | 2024-02-02 | 山东科技大学 | Inertial pressure accumulation amplitude-rising type pulse device |
| CN115387771B (en) * | 2022-08-10 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Coal mine underground segmented hydraulic fracturing tool string with rapid blocking removal function and method |
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| CN2182877Y (en) * | 1994-03-17 | 1994-11-16 | 大庆石油管理局采油工艺研究所 | Oscillator for perforator |
| CN200955378Y (en) * | 2006-09-13 | 2007-10-03 | 辽河石油勘探局 | Full-bore low-resistance detection back-washing valve |
| CN102493791A (en) * | 2007-12-14 | 2012-06-13 | 中国石油大学(北京) | Abrasive material jet injection device |
| CN103534436B (en) * | 2010-12-17 | 2018-01-19 | 埃克森美孚上游研究公司 | Autonomous type downhole conveyance system |
| US9228738B2 (en) * | 2012-06-25 | 2016-01-05 | Orbital Atk, Inc. | Downhole combustor |
| CN102900406B (en) * | 2012-10-10 | 2015-11-11 | 胜利油田高原石油装备有限责任公司 | Pressure pulse oil well production increasing device and application process thereof |
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