CN206888944U - Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means - Google Patents
Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means Download PDFInfo
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- CN206888944U CN206888944U CN201720661950.8U CN201720661950U CN206888944U CN 206888944 U CN206888944 U CN 206888944U CN 201720661950 U CN201720661950 U CN 201720661950U CN 206888944 U CN206888944 U CN 206888944U
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Abstract
Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means, including taper type cylinder assembly, and the top connection for being arranged at taper type cylinder assembly upper end and the lower contact for being arranged at taper type cylinder assembly lower end, the piston of the taper type supporting with it is provided with taper type cylinder assembly, piston lower portion is provided with back-moving spring, the lower end of back-moving spring is provided with cradle, piston is descending under differential pressure action and compression reseting spring, order opens upper, middle and lower relief hole when descending, and taper type piston outer periphery cross section of fluid channel product also gradually increase, until taper type descent of piston reaches down stroke stop；The back-moving spring now compressed is gone beyond the Great Wall, under orderly close-down, in, top relief hole, until reach up stroke stop reset completely, start next vibration period；The utility model have it is simple in construction, realize it is convenient, safe and reliable, and the characteristics of hydraulic fracturing averaging effect can be effectively improved.
Description
Technical field
Oil gas field Reservoir Acidization operation downhole tool is the utility model is related to, more particularly to oil and gas reservoir acidifying underground is low
Frequency hydraulic pulse generating means.
Background technology
In oil-gas field development, reservoir matrix Acidizing Technology is compact reservoir volume increase, the important measures of augmented injection.
At present, in oil and gas reservoir acidizing treatment, conventional acidulation stimulation technology is asked in the presence of some technologies urgently to be resolved hurrily
Topic, especially in hypotonic, ultra-permeable reservior matrix acidifying.
Injecting acid solution includes hydrochloric acid, mud acid, organic acid, foamed acid etc., it is expected that acid solution can uniformly promote in reservoir, in well
In the range of the 1m~2m reservoirs of cylinder periphery, part cement or further corrosion part rock between acid solution energy corrosion rock particles
Grain, promote the hole throat dimension enlargement of porosity medium reservoir, connective enhancing, and then permeability increases, play volume increase or
Augmented injection effect.
But chip matter sedimentary rock has very strong anisotropism, it is in particular in that stratification and rock composition are upper heterogeneous
Property.And from the angle of seepage flow, because macropore, microcrack be present, in addition to vertical permeability is widely different, permeability is each in plane
Anisotropy also shows substantially, great on the influence such as oil-gas mining and water filling, and hypotonic, Oil in Super-low Permeability Reservoirs is especially prominent.Engineering is real
Trample and show, even with the substratum segmented in current engineering, permeability anisotropy often influences matrix acidifying
The big factors of operation effectiveness.Therefore an important factor for also turning into influence acidizing treatment effect.
In conventional substrate acidizing treatment operation, it is intended that acid solution can be promoted uniformly, but be generally difficult to avoid acid solution flat
Fingering and vertical upper tonguing on face.In macropore region, microcrack, acid solution fltting speed is fast；In the relatively low area of permeability
Domain, acid solution promote slow or few acid solutions to enter, are also quickly become weary acid even if a small amount of acid solution is entered, it is accordingly required in particular to acidifying
This part of rock volume is not acidified effectively on the contrary.So in hypotonic, ultra-permeable reservior matrix acidifying, ensure acid solution
It is always the significant technology issues for restricting matrix acidifying operation effectiveness uniformly to promote, and is difficult to have in the construction under present technological conditions
Effect control.
The content of the invention
In order to achieve the above object, the purpose of this utility model is to provide oil and gas reservoir acidifying underground low-frequency hydraulic pulse
Generating means, when acidizing treatment is constructed, the low frequency hydraulic pulse of some strength can be produced in underground under treatment fluid flow effect,
Facilitate with simple in construction, realization, be safe and reliable, and the characteristics of energy effective reservoir acidizing effect.
To achieve these goals, it is as follows to employ technical scheme for the utility model：
Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means, including taper type cylinder assembly 2, and is arranged at cone
The top connection 1 for being machined with API standard oil pipe connection screw thread of the upper end of platform shape cylinder assembly 2 and it is arranged at taper type cylinder assembly 2
Lower end is machined with API standard oil pipe connection screw thread lower contact 9, and the frustum supporting with it is provided with taper type cylinder assembly 2
The piston 6 of shape, the bottom of piston 6 are provided with back-moving spring 7, and the lower end of back-moving spring 7 is provided with cradle 8.
Described taper type cylinder assembly 2 divides upper, middle and lower three-layer set, and every layer is provided with circumferential uniform radial flow path
Each four of through hole, respectively top relief hole 3, middle part discharge orifice 4 and bottom discharge orifice 5, pore diameter range is followed successively by 5mm~6mm,
6mm~8mm, 10mm~12mm, each circumferentially-spaced 30 degree of hole is uniform, the upper section 15mm of centre distance piston 6 of top relief hole 3
~20mm, lap is 2mm~4mm in height for top relief hole 3, middle part discharge orifice 4 and bottom discharge orifice 5.
Described taper type cylinder assembly 2 and the cooperation range of taper of piston 6 are 1：(20~25).
With existing compared with Acidizing Technology, the beneficial effects of the utility model are：
1 employs based on the driving of acidizing treatment working solution, realizes underground low-frequency hydraulic pulse in acidizing treatment.Based on theory
Basic research, under the effect of low frequency hydraulic pulse, in porous reservoir medium, acid solution relatively uniform can promote in reservoir,
Effectively fingering common in suppression matrix acidifying operation and tonguing phenomenon, improve acidifying swept volume, and then improve integrated substrate
Acidizing effect.
2 adapt to conventional substrate acidification technique, adapt to conventional acidulation working string Intensity Design, structure design and acidifying and apply
Work designs；Working security is especially considered in design, do not interfered with even if tool failures yet matrix acidifying construction continue into
OK, it is highly safe reliable.
3 are not only simple in structure, and it is convenient to realize, and can be applied to Oil/gas Well matrix acidifying stimulation work, water injection well stimulation
Matrix acidifying operation and Oil/gas Well pickling operation etc..Adapt to conventional acidulation technique and acidizing treatment parameter designing, the scope of application
Extensively, there is good popularizing application prospect.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is radial flow path through hole distribution schematic diagram of the present utility model.
Fig. 3 is using effect schematic diagram of the present utility model.
Embodiment
The utility model patent is described further below in conjunction with the accompanying drawings.
Reference picture 1, oil and gas reservoir acidifying underground low-frequency hydraulic pulse generating means, including taper type 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 upper end of taper type cylinder assembly 2 and is arranged at taper type cylinder
The lower end of body assembly 2 is machined with API standard oil pipe connection screw thread lower contact 9, is provided with taper type cylinder assembly 2 supporting with it
Taper type piston 6, the bottom of piston 6 is provided with back-moving spring 7, the lower end of back-moving spring 7 is provided with cradle 8.
Referring to collection of illustrative plates 2, taper type cylinder assembly 2 of the present utility model divides upper, middle and lower three-layer set, and every layer is provided with 4
Circumferential uniform radial flow path through hole, respectively top relief hole 3, middle part discharge orifice 4 and bottom discharge orifice 5, radial flow path through hole
Diameter and position of opening be according to live acidizing treatment operation flow, spring rate and piston mass optimize calculate determine.
Middle part discharge orifice 4 and the position of bottom discharge orifice 5 are determined according to the work discharge capacity bigger than normal being likely to occur.
Described taper type cylinder assembly 2 and the cooperation range of taper of piston 6 are 1：(20-25), taper type can be prevented
Piston is stuck in taper type cylinder body in acidizing treatment operation by foreign matters such as sand grains, ensures vibrational system normal work；It is designed as
Coordinate range of taper 1：The purpose of (20~25) is next to that in order to solve to be likely to occur discharge capacity in construction operation beyond normally applying
Work designs and causes output fluid pulsation frequency bigger than normal, it is difficult to realizes the low frequency pulsating required by the utility model, and prevents
Big water attack effect is produced in construction in up-stroke of piston stop.
On described taper type cylinder assembly three different height position higher slices be sequentially set with top relief hole 3, in
Portion's discharge orifice 4 and bottom discharge orifice 5 each 4, pore diameter range are followed successively by 5mm~6mm, 6mm~8mm, 10mm~12mm, each hole week
Uniform to 30 degree of interval, top relief hole 3, the aperture of middle part discharge orifice 4 and bottom discharge orifice 5, specific height and position are according to acid
Be turned into industry discharge capacity, it is necessary to 10~20Hz of low frequency hydraulic pulse frequency, hydraulic pulse amplitude 1.5MPa~2MPa, with reference to vibration system
The optimization such as back-moving spring rigidity, piston mass, fluid density, fluid viscosity is calculated in system, optimizes the size range of determination
For：Upper section 15mm~the 20mm of centre distance piston 6 of top relief hole 3, top relief hole 3, middle part discharge orifice 4 and bottom are let out
Lap is 2mm~4mm to discharge orifice 5 in height.
The diameter and position of opening of each radial flow path through hole be according to live acidizing treatment operation flow, spring rate with
Piston mass calculates what is determined:
If the quality of taper type piston is m, its net sectional area is Sp, and back-moving spring stiffness coefficient is k, and working fluid is close
Spend 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,
Piston 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,
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：Pa is that the upper and lower section of the secondary piston of relief hole 3 is born on fluid forces descent of piston opening cylinder side wall
Pressure difference；PbOpened completely on cylinder side wall after relief hole 3 for fluid forces descent of piston, pressure difference is born in the upper and lower section of piston.
, it is necessary to prepare a computer program during actual design calculates, primarily determine that piston size, injected with detail design acid solution
0.2~0.5m of discharge capacity3/ min is foundation, to realize that drafting low frequency such as 10Hz calculates determination other parameters.
Further, to realize the low frequency pulsating drafted, middle part discharge orifice 4 and bottom discharge orifice 5 are provided with, thus in fact
After the actual displacement that is likely to occur is more than design discharge capacity in now constructing, arteries and veins is better achieved in certain limit in control piston stroke
The low frequency pulsating output of dynamic generating means.
Described piston 6 and the back-moving spring 7 positioned at the bottom of piston 6 form one and are acidified the reciprocal of working solution driving
Formula mechanical vibrating system.In Oil Field acidizing treatment operation, low frequency hydraulic pulse under working solution hydro powered mode
System of reciprocating vibration, output optimization calculate the low frequency pulsation of the certain pressure wave amplitude determined.To overcome piston 6 up completely
Close the influence of water attack effect caused by runner, remain of reciprocating vibration under acidizing treatment discharge capacity, piston 6 and taper type cylinder body
Assembly 2 coordinates taper, while can also prevent occurring the failures such as piston sand card in acidizing treatment.
Operation principle of the present utility model is as follows：
As shown in figure 3, the utility model is in use, bottom connection nib instrument 13, top connecting bypass valve 11, by-passing valve
11 tops connect the acidifying tubing string 10 of pressing crack construction.Acidifying prepad fluid, acidifying solution, which flow through, can produce intensity after the utility model and be
1MPa or so low frequency hydraulic pulse pressure, ripple frequency are in 10Hz or so.
In acidizing treatment operation, under in taper type piston, hydraulic pressuring difference acts on about 6, taper type piston 6 is made in pressure difference
The descending and compression reseting spring 7 under, when taper type piston 6 is descending order open top relief hole 3, middle part discharge orifice 4 and under
Portion's discharge orifice 5, and the also gradually increase of taper type piston outer periphery cross section of fluid channel product, pressure difference is gradual up and down when taper type piston 6 is descending
Reduce, until taper type descent of piston is until downward storke stop；The back-moving spring 7 now compressed promotes taper type piston 6
It is up, taper type piston stroking upward then orderly close-down bottom discharge orifice 5, middle part discharge orifice 4 and top relief hole 3 in up stroke,
And taper type piston outer periphery cross section of fluid channel product is also gradually reduced, until reaching up stroke stop.So, on taper type piston 6
Lower pressure difference increases to maximum again, starts next vibration period.
The taper type reciprocating motion of the pistons being achieved in the range of certain operation flow, export during so as to realize acidizing treatment
Low frequency pulsating under fluid certain pressure wave amplitude.
The utility model patent is applied in acidizing treatment, produces underground low-frequency hydraulic pulse, passes through each structural parameters system
The optimization design of system, hydraulic pulse frequency is about 10Hz~20Hz under the conditions of routine work, and hydraulic pressure ripple is controlled in construction
Dynamic amplitude be 1.5MPa~2MPa, promotes acid solution uniformly to be promoted in reservoir matrix, raising Reservoir Acidization operation effect of increasing production or
The augmented injection effect of water injection well.
The utility model aims at acid solution in acidizing treatment and low frequency pulsating, panting action is realized in reservoir pore space medium
Lower acid solution can be promoted uniformly, suppress to influence fingering and the tonguing phenomenon of acidizing effect, improve volume acidifying efficiency.In order to control arteries and veins
Move the usual wave propagation decay of propagation attenuation in reservoir pore space medium fluid greatly to and frequency square directly proportional, increase arteries and veins
Dynamic EFFECTIVE RANGE, low frequency pulsating are ideal, that is to say, that it is required that ripple frequency is in caused by pulse generating device
Low-frequency range, experimental study think that 10Hz or so effects are ideal.
Claims (3)
1. oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means, it is characterised in that including taper type cylinder assembly (2),
And it is arranged at the top connection (1) for being machined with API standard oil pipe connection screw thread of taper type cylinder assembly (2) upper end and is arranged at
Taper type cylinder assembly (2) lower end is machined with API standard oil pipe connection screw thread lower contact (9), and taper type cylinder assembly (2) is interior
The piston (6) of the taper type supporting with it is provided with, piston (6) bottom is provided with back-moving spring (7), in back-moving spring (7)
Lower end is provided with cradle (8).
2. oil and gas reservoir according to claim 1 is acidified underground low-frequency hydraulic pulse generating means, it is characterised in that described
Taper type cylinder assembly (2) divide upper, middle and lower three-layer set, every layer is provided with circumferential each four uniform of radial flow path through hole,
Respectively top relief hole (3), middle part discharge orifice (4) and bottom discharge orifice (5), pore diameter range are followed successively by 5mm~6mm, and 6mm~
8mm, 10mm~12mm, each circumferentially-spaced 30 degree of hole is uniform, centre distance piston (6) upper section 15mm of top relief hole (3)
~20mm, lap is 2mm~4mm in height for top relief hole (3), middle part discharge orifice (4) and bottom discharge orifice (5).
3. oil and gas reservoir according to claim 1 is acidified underground low-frequency hydraulic pulse generating means, it is characterised in that described
Taper type cylinder assembly (2) and piston (6) cooperation range of taper 1：(20~25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720661950.8U CN206888944U (en) | 2017-06-08 | 2017-06-08 | Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720661950.8U CN206888944U (en) | 2017-06-08 | 2017-06-08 | Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means |
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| Publication Number | Publication Date |
|---|---|
| CN206888944U true CN206888944U (en) | 2018-01-16 |
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| CN201720661950.8U Expired - Fee Related CN206888944U (en) | 2017-06-08 | 2017-06-08 | Oil and gas reservoir is acidified underground low-frequency hydraulic pulse generating means |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708696A (en) * | 2018-04-24 | 2018-10-26 | 中国石油天然气股份有限公司 | Continuous pulse acidification method |
| CN111911125A (en) * | 2020-08-26 | 2020-11-10 | 中国石油大学(北京) | Energy-gathering fracturing tool |
-
2017
- 2017-06-08 CN CN201720661950.8U patent/CN206888944U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708696A (en) * | 2018-04-24 | 2018-10-26 | 中国石油天然气股份有限公司 | Continuous pulse acidification method |
| CN111911125A (en) * | 2020-08-26 | 2020-11-10 | 中国石油大学(北京) | Energy-gathering fracturing tool |
| CN111911125B (en) * | 2020-08-26 | 2021-09-07 | 中国石油大学(北京) | Energy-gathering fracturing tool |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180116 |
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| CF01 | Termination of patent right due to non-payment of annual fee |