CN207177869U - Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means - Google Patents
Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means Download PDFInfo
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- CN207177869U CN207177869U CN201720662397.XU CN201720662397U CN207177869U CN 207177869 U CN207177869 U CN 207177869U CN 201720662397 U CN201720662397 U CN 201720662397U CN 207177869 U CN207177869 U CN 207177869U
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- compound frustum
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- 150000001875 compounds Chemical class 0.000 claims abstract description 70
- 239000012530 fluid Substances 0.000 abstract description 22
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- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 abstract description 2
- 208000010392 Bone Fractures Diseases 0.000 description 21
- 206010017076 Fracture Diseases 0.000 description 21
- 238000013461 design Methods 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 238000010276 construction Methods 0.000 description 12
- 239000004576 sand Substances 0.000 description 11
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- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
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Abstract
Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means, including compound frustum cylinder assembly, and the top connection for being arranged at compound frustum cylinder assembly upper end and the lower contact for being arranged at lower end, the compound frustum piston supporting with it is provided with compound frustum cylinder assembly, through hole is provided with compound frustum piston, compound frustum piston outer periphery is evenly equipped with the half slot of sands-proof check, and compound frustum piston lower portion is provided with back-moving spring, and the lower end of back-moving spring is provided with cradle；Working liquids pressure difference above and below compound frustum piston reaches descending, compression reseting spring after certain value, and then its periphery flow area gradually increases compound frustum descent of piston, and pressure difference reduces compound frustum piston up and down, and back-moving spring promotes compound frustum piston stroking upward；Thus reciprocating vibration is produced, low frequency hydraulic pulse is produced in fracturing fluid is exported；The utility model is based on hydraulic fracturing job work displacement range, realizes the low frequency hydraulic pulse output of hydro powered mode, can improve fracturing effect on the whole.
Description
Technical field
It the utility model is related to oil gas field reservoir hydrfracturing operation downhole tool class, more particularly to Oil/gas Well hydraulic fracturing
Underground low-frequency hydraulic pulse generating means.
Background technology
In oil-gas field development, hydraulic fracturing technology is the important measures of compact reservoir frscturing.
At present, in oil and gas reservoir pressure break, there are some technologies urgently to be resolved hurrily in conventional hydraulic pressure break skill yield-increasing technique technology
Problem.
The generation of artificial hydraulic fracture, the stretching for relying primarily on the generation of pressure break the hydraulic coupling borehole wall and reservoir rock in pit shaft are broken
It is bad, rise and stitch and extend vee crack.The seam that rises of man-made fracture is mainly influenceed by formation fracture pressure, man-made fracture direction and expansion
Mainly by reservoir, crustal stress controls on the spot for exhibition.Because indivedual reservoir formation fracture pressures are high, it is pumped higher in construction or even goes back
Often there is the problem of pressing not open；Because reservoir is pore media, cross section of fluid channel is variable mass flow in the extension of crack, is pressed in addition
Splitting proppant (fracturing sand being commonly called as, for quartz sand or artificial haydite) density and be more than fracturing fluid, proppant easily settles in crack,
It is always the significant technology issues for restricting fracturing work effect that fracturing fluid, which effectively takes uniform sanding in sand and crack, at present technique skill
Art is difficult to effectively control.In volume seam net pressure break, because the anisotropism of rock causes fracture pressure difference, and should by ground
Power controls, it is generally difficult to forms effectively seam net.
How effectively to be reduced in conventional hydraulic pressure break in seam pressure and crack and realized that fracturing fluid effectively takes sand, uniform sanding
It is significant technology issues urgently to be resolved hurrily in engineering.
In low-permeability oilfield pressure break, old well refracturing is the important technique measure of oil gas field volume increase, in refracturing, is split
Steering technique is stitched it is verified that effective means for volume increase.Turn in refracturing, emphasis blocks old seam, in the borehole wall to be effective
Or the nearly borehole wall restarts new seam.It is conventional to turn in refracturing construction technology, it can realize that crack turns to and not known in the presence of very big
Property, uncontrollable, there is presently no effective feasible method.
The content of the invention
The defects of in order to overcome above-mentioned prior art, the purpose of this utility model are to provide Oil/gas Well hydraulic fracturing underground
Low frequency hydraulic pulse generating means, under being acted on based on hydraulic fracturing liquid stream, produce underground low-frequency hydraulic pulse, low frequency pulsating effect
It is lower effectively to reduce formation fracture pressure, play seam beneficial to artificial hydraulic fracture；Under fluctuation pressure effect, pressure break liquid energy is in fracture extension
Sand, uniform sanding are effectively taken in expansion process, and then improves fracture condudtiviy；And in repetition hydraulic fracturing is turned to, can have
Effect closure primary fracture, beneficial to the new man-made fracture of generation, and then realize that crack turns to.The utility model have it is simple in construction,
Realize the characteristics of facilitating.
To achieve these goals, it is as follows to employ technical scheme for the utility model：
Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means, including compound frustum cylinder assembly 2, and set
In the compound upper end of frustum cylinder assembly 2 the top connection 1 for being machined with API standard oil pipe connection screw thread and be arranged at compound frustum cylinder
The lower end of body assembly 2 is machined with API standard oil pipe connection screw thread lower contact 7, is provided with compound frustum cylinder assembly 2 and matches somebody with somebody with it
The compound frustum piston 3 of set, through hole 4 is provided with compound frustum piston 3, the compound periphery of frustum piston 3 is evenly equipped with sands-proof check
Half slot 3-1, the compound bottom of frustum piston 3 are provided with back-moving spring 5, the lower end of back-moving spring 5 are provided with cradle 6.
The taper of the compound length of 3 top of frustum piston 1/3rd is 1：(12~16), the taper of bottom is 1：(8
~10), the diameter range of through hole 4 is in 16mm~20mm, and length range is in 140mm~200mm.
There is identical to coordinate taper, the compound periphery of frustum piston 3 for compound frustum cylinder assembly 2 and compound frustum piston 3
The half slot 3-1 of sands-proof check, a diameter of 1.5mm~2mm of half slot 3-1 are evenly equipped with, half slot angle of inclination is 20~25 degree.
Compared with prior art, field application beneficial effect of the present utility model is：
1st, the utility model is based under fracturing working fluid effect, realizes that underground low-frequency is pulsed in fracturing work.Based on rock
Damage mechanics theory and simulation experiment study result, under the effect of hydraulic fracturing liquid stream, produce underground low-frequency hydraulic pulse, low frequency arteries and veins
Action plays seam with can effectively reduce formation fracture pressure, beneficial to artificial hydraulic fracture；Meanwhile low frequency pulsating can formed
There is effect spread in man-made fracture face, under pulsation effect, carry fracturing sand in crack beneficial to fracturing fluid and pushed away forward with crack extension
Enter, reduce fracturing sand sedimentation, promote uniform sanding, solve insurmountable technology in current conventional fracturing work to a certain extent
Problem, and then man-made fracture flow conductivity is improved, obtain more preferable hydraulic fracturing effect of increasing production.
Hypotonic super low percolation oilfield improvement is usually 6 months to 24 months, and low frequency pulsating turns applied to Lao Jing cracks
Into refracturing, first, low frequency pulsating promotes blocking agent injection stage to strengthen primary fracture closure, prevents follow-up pressure break from continuing to press
Open original old crack；Secondly, based on rock damage mechanics theory and simulated experiment, reduce stratum under fluctuation pressure effect and break
Split pressure, the borehole wall or nearly shaft wall fracture pressure reduce, and are advantageous to play seam in the borehole wall or the new crack of the nearly borehole wall, and then be advantageous to crack
Turn to.
2nd, the utility model adapts to conventional hydraulic fracturing technology, adapts to conventional fracturing string Intensity Design, structure design
Designed with pressing crack construction；After the utility model, the tooling strength is more than tube column strength, and especially considers and apply in designing
Work security, continuing for hydraulic fracturing construction is not interfered with even if tool failures yet, the tool height is safe and reliable.
3rd, the utility model is not only simple in structure, and it is convenient to realize, and can be applied to traditional well fracturing, the steering of old well
Refracturing etc..Special compound frustum and piston hole design adapts to conventional hydraulic fracturing technology and fracturing parameter is set
Meter, it is applied widely, there is large-scale promotion application prospect.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the scheme of installation with remaining equipment when the utility model 9 uses.
Fig. 3 is the front view of compound frustum piston 3.
Fig. 4 is the top view of compound frustum piston 3.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.Embodiment of the present utility model includes but is not limited to
The following example.
Reference picture 1, Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means, including compound frustum cylinder assembly 2,
And it is arranged at the top connection 1 for being machined with API standard oil pipe connection screw thread of the compound upper end of frustum cylinder assembly 2 and is arranged at multiple
That closes the lower end of frustum cylinder assembly 2 is machined with API standard oil pipe connection screw thread lower contact 7, is set in compound frustum cylinder assembly 2
There is the compound frustum piston 3 supporting with it, through hole 4 is provided with compound frustum piston 3, the through hole 4 can overcome compound frustum to live
Row closes the influence of water attack effect caused by runner beyond the Great Wall, while ensure that and huge discharge is adapted in hydraulic fracturing job, it is allowed to
Fracturing sand in high color standard liquid, repeat passing through for highly viscous sealing agent in turnaround fracture.Reference picture 3, Fig. 4, Composite Cone
The periphery of platform piston 3 is evenly equipped with the half slot 3-1 of sands-proof check, and the compound bottom of frustum piston 3 is provided with back-moving spring 5, is resetting bullet
The lower end of spring 5 is provided with cradle 6.
The taper of the compound length of 3 top of frustum piston 1/3rd is 1：(12~16), the taper of bottom is 1：(8
~10), the diameter range of through hole 4 is in 16mm~20mm, and length range is in 140mm~200mm.
There is identical to coordinate taper, the compound periphery of frustum piston 3 for compound frustum cylinder assembly 2 and compound frustum piston 3
The half slot 3-1 of sands-proof check, a diameter of 1.5mm~2mm of half slot 3-1 are evenly equipped with, half slot angle of inclination is 20~25 degree.
The cooperation range of taper, the compound center of frustum piston 3 through hole 4 size, and compound frustum piston 3 and compound frustum cylinder body
Under the matching of the physical dimension of assembly 2, it can guarantee that and worked in hydraulic fracturing under discharge capacity, compound frustum piston 3 can compress reset when descending
Spring 5 arrives design runlength, then effective pressure release and aerial drainage, and back-moving spring 5 promotes compound frustum piston 3 to be up to predetermined stroke,
And then realize that compound frustum piston 3 moves back and forth, low frequency hydraulic pulse is produced in fracturing working fluid is exported.It is compound in design
Frustum cylinder body 2 coordinates taper and concrete structure size, the compound size of frustum piston hole 4, Composite Cone with compound frustum piston 3
Platform piston outer periphery sand control neck size and the coefficient of elasticity of back-moving spring 5 etc., it is according to live conventional hydraulic pressure break in design
Construction operation flow, fluid property parameter, spring rate and piston mass calculate what is determined:
The diameter of piston centre through hole and compound frustum cylinder body, compound frustum piston coordinate taper, section length to determine
It is variable section runner that working solution, which flows through the instrument,.
If compound frustum piston mass is m, net sectional area Sp, back-moving spring stiffness coefficient is k, working fluid density
For ρ, viscous drag coefficient ξ, it is respectively P that upper lower section, which bears mean pressure difference, in piston stroke1And P2；Piston displacement is x, living
Plug stroke is h, time t, then during descent of piston：
During piston stroking upward：
Herein, P1And P2Calculate and provide according to design piston size and travel position combination fluid mechanics principle.Piston row
Journey position is different, and its periphery cross section of fluid channel is different, while pressure difference is also different up and down for piston., it is necessary to consider piston in actual calculating
Through hole changes with the assignment of traffic of piston outer periphery cross section of fluid channel and the viscous drag coefficient of piston outer periphery runner, it is difficult to provide solution
Analyse algorithm.In actual design, binding tests test amendment, P is finally determined using hydromechanical numerical algorithm1And P2。
Thus the haul distance of piston can be calculated：
Back-moving spring stiffness coefficient can be expressed as：
This frequency of reciprocating vibration is：
In above formula：By test simulation under conventional pressure break discharge capacity, with reference to hydrodynamics numerical algorithm, using above-mentioned formula meter
During calculation, Pa values are pressure difference that the upper and lower section of piston is born before fluid forces descent of piston, substantially 2.6MPa or so；PbFor
Fluid forces descent of piston, piston outer periphery cross section of fluid channel gradually increase, and piston outer periphery cross section of fluid channel increases to a certain extent, piston
Bear pressure difference, substantially 0.5MPa or so in upper and lower section.But pressing crack construction discharge capacity, fracturing sand concentration are different, in calculating, value is not
Together.
The pressure difference up and down of piston difference travel position is calculated, it is necessary to prepare a computer program in design calculates, with construction
Design 1.2~4.5m of fracturing fluid injection discharge capacity3/ min is design basis data, to realize that drafting low frequency such as 10Hz calculating determines it
Its parameter.
, it is necessary to be tested with reference to simulated test in the actual engineering design of the utility model instrument calculates, cut calculating to become
On the basis of surface current road fluid parameter, calculate the physical dimension that determines final compound frustum cylinder body and compound frustum piston and
The stiffness coefficient of back-moving spring.
Further, to realize the low frequency pulsating drafted, supporting cylinder body, plunger designs are compound frustum, are realized
Piston outer periphery cross section of fluid channel increases when descending, is achieved in first pressure release, rear aerial drainage, and then realize the reciprocal fortune of compound frustum piston
Dynamic, the design of piston centre through hole can better adapt to the huge discharge in hydraulic fracturing construction, and control piston stroke is in certain model
Enclose, the low frequency pulsating output of pulse generating device is better achieved.
According to fatigue damage of rock theory of mechanics, under low frequency pulsating effect, rock rupture pressure declines, beneficial to hydraulic fracturing
Play seam；Meanwhile low frequency pulsating fluctuation is in the air, in theory, the superposition of ripple will cause the expansion of fluctuation pressure wave-amplitude-
Pressure break hydraulic coupling increases.Numerical analysis method simulation calculating shows that under given conditions, the amplitude of pulsating pressure waves can expand
1.0~5 times；The fluctuation pressure amplitude that physical simulation experiment comparative analysis provides can expand 2.2~4.2 times.Simulation scene is real
Apply pulsed hydraulic fracturing comparative analysis to show, fluctuation pressure amplitude can expand 1.5~3.0 times.
Thus, using the utility model, man-made fracture initial cracking pressure can be effectively reduced in hydraulic fracturing；Meanwhile
Fracturing sand sedimentation is reduced in crack, promotes uniform sanding, improves fracture condudtiviy, and then improve fracturing yield increasing effect.
The course of work of the present utility model is as follows：
As shown in Fig. 2 the utility model 9 is connected to the top of sanding machine 10, the top connection fracturing string of the utility model 9
8, hydraulic fracturing working solution flows through, and after flow reaches work discharge capacity, compound frustum piston is under pressure difference reaches after certain value about 3
OK, compression reseting spring 5, compound frustum piston 3 is descending, and its periphery flow area gradually increases, and is pushed on compound frustum piston
Difference reduces, until back-moving spring promotes compound frustum piston stroking upward, thus produces reciprocating vibration, is produced in fracturing fluid is exported
Raw low frequency hydraulic pulse.
The back-moving spring 5 of the compound bottom of frustum piston 3 described in the utility model and positioned at the compound bottom of frustum piston 3
Back-moving spring cradle 6 forms a reciprocating machine vibrational system, in fracturing work, produces low-frequency vibration, and then export
Fracturing fluid produces low frequency hydraulic pulse.Wherein, the diameter of the through hole 4 on compound frustum piston 3 and length are pressed according to scene
Split construction operation flow optimization and calculate what is determined, in the range of certain operation flow, in compound frustum cylinder body 2, Composite Cone
When platform piston 3 and back-moving spring 5 form an adaptation oil gas field field hydraulic pressing crack construction operation, the energy under hydro powered mode
Produce the system of reciprocating vibration of low frequency hydraulic pulse.The utility model is applied in hydraulic fracturing job, pad of frac, takes sand
Liquid stream produces the hydraulic pulse pressure wave amplitude that intensity is 2MPa or so after crossing the device, produces underground low-frequency hydraulic pulse frequency and exists
10Hz or so, by each mate of structural parameters optimization design, under the conditions of routine work hydraulic pulse frequency be about 10Hz~
20Hz, it is 1.5MPa~3MPa that hydraulic pressure fluctuating range is controlled in construction.
Claims (3)
1. Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means, it is characterised in that including compound frustum cylinder assembly
(2), and be arranged at compound frustum cylinder assembly (2) upper end the top connection (1) for being machined with API standard oil pipe connection screw thread and
Be arranged at compound frustum cylinder assembly (2) lower end is machined with API standard oil pipe connection screw thread lower contact (7), compound frustum cylinder
The compound frustum piston (3) supporting with it is provided with body assembly (2), through hole (4) is provided with compound frustum piston (3), it is multiple
The half slot (3-1) that frustum piston (3) periphery is evenly equipped with sands-proof check is closed, compound frustum piston (3) bottom is provided with back-moving spring
(5) lower end of back-moving spring (5), is provided with cradle (6).
2. low frequency hydraulic pulse generating means in Oil/gas Well hydraulic fracturing underground according to claim 1, it is characterised in that institute
The taper of the compound length of frustum piston (3) top 1/3rd is stated 1：(12-16), the taper of bottom is 1：(8-10), through hole 4
Diameter range is in 16mm~20mm, and length range is in 140mm~200mm.
3. low frequency hydraulic pulse generating means in Oil/gas Well hydraulic fracturing underground according to claim 1, it is characterised in that multiple
It is uniform with identical cooperation taper, compound frustum piston (3) periphery to close frustum cylinder assembly (2) and compound frustum piston (3)
There are the half slot (3-1) of sands-proof check, half slot (3-1) a diameter of 1.5mm~2mm, half slot (3-1) angle of inclination is 20~25
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720662397.XU CN207177869U (en) | 2017-06-08 | 2017-06-08 | Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720662397.XU CN207177869U (en) | 2017-06-08 | 2017-06-08 | Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207177869U true CN207177869U (en) | 2018-04-03 |
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ID=61734566
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|---|---|---|---|
| CN201720662397.XU Expired - Fee Related CN207177869U (en) | 2017-06-08 | 2017-06-08 | Oil/gas Well hydraulic fracturing underground low frequency hydraulic pulse generating means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207177869U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027397A (en) * | 2021-03-05 | 2021-06-25 | 中国石油大学(华东) | Hydraulic pulsation auxiliary nitrogen-chemical flooding ground control device and implementation method |
-
2017
- 2017-06-08 CN CN201720662397.XU patent/CN207177869U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027397A (en) * | 2021-03-05 | 2021-06-25 | 中国石油大学(华东) | Hydraulic pulsation auxiliary nitrogen-chemical flooding ground control device and implementation method |
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Granted publication date: 20180403 |