CN205317587U - Small -size hydraulic fracturing triaxial evaluation test pressure device - Google Patents
Small -size hydraulic fracturing triaxial evaluation test pressure device Download PDFInfo
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- CN205317587U CN205317587U CN201520986416.5U CN201520986416U CN205317587U CN 205317587 U CN205317587 U CN 205317587U CN 201520986416 U CN201520986416 U CN 201520986416U CN 205317587 U CN205317587 U CN 205317587U
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Abstract
The utility model provides a small -size hydraulic fracturing triaxial evaluation test pressure device, which comprises a housin, the X axle is connected respectively through the through -hole in casing both sides face and the following, the Y axle, Z axle orientation adds uninstallation mechanism, X axle orientation adds uninstallation mechanism, Y axle orientation adds uninstallation mechanism front end and respectively connects a big picture peg, Z axle orientation adds uninstallation mechanism front end connection side board, the other both sides of casing face is inside respectively connects a set of little picture peg through the recess, the square apron of screwed connection is passed through on the casing top, put into the casing with the rock core, through the hydraulic pump to X, Y, the Z direction is pressurizeed in proper order, the pipeline has been connected, whether detect there is the fluid exudation, set for the constant flow pump for required constant discharge, carry out the fracturing simulation tests, the crack produces, can produce the sound incident, acoustic emission monitoring system can fix a position these incidents, the result gathers the most at last, can obtain the process and the final form picture of fracture propagation, the well drilling is cored to tight sand gas reservoir reservoir, utilize this device and method to simulate fissured crack initiation and extension in the reservoir comparatively authentic and validly.
Description
Technical field
The utility model relates to waterfrac treatment technical field of measurement and test, is specifically related to be that a kind of simulation carries out immediate vicinity of wellbore formation fracture crack initiation for different fluid and rock under different levels pressure difference and extends simulation small volume hydraulic fracture evaluation test device.
Background technology
Hydraulic fracturing technology have passed through the development of nearly half a century, particularly since the end of the eighties, all obtain in FRACTURING DESIGN, fracturing liquid and additive, propping agent, fracturing unit and Monitoring equipment and Crack Detection etc. and develop rapidly, make hydraulic fracturing technology, in fracture height control technology, the anti-sand pressure break of high permeability formation, refracturing, deep penetrating fracture and large sand amount multistage fracturing etc., new breakthrough all occur. Present hydraulic fracturing technology is as the major measure of oil and water well increasing yield and injection, it is widely used in the exploitation of low permeability oil and gas field, improve the seepage flow condition near shaft bottom by waterfrac treatment, it is to increase oil well productivity, have the crude production rate of 30% to be obtained by pressure break in the U.S.. The output of domestic low-permeability oilfield and the output obtained by waterfrac treatment transformation are also being increased gradually, particularly just locating the petroleum industry depressed epoch now, to the widespread use of hydraulic fracturing technology with go deep into conscientious research and be expected to inject new vitality and life to petroleum industry, the optimum enforcement of hydraulic fracturing technology and the breakthrough of key technology, bring inestimable prospect by petroleum industry.
The high flow conductivity crack that pressure break produces greatly can be improved zone permeability thus improve oil well output, and one of key issue of waterfrac treatment is exactly how to descend the geometrical dimension in water conservancy crack, orientation and position definitely. The detection technique in development and research crack is a weak link of current hydraulic fracturing technology, although but the detection method adopted both at home and abroad achieves certain effect also has significant limitation also to need further research.
Research fracture initiation domestic at present and the instrument of extension are large-scale real triaxial waterfrac treatment simulated experiment instrument, such as China University Of Petroleum Beijing (Beijing) rock mechanics laboratory, Oil Exploration in China development research alure mill branch etc., although hydraulically created fracture expansion mechanism simulated experiment when adopting large size true triaxial simulation experiment system can simulate reservoir terrestrial stress, experimental sample is the natural rock sample of 300mm × 300mm × 300mm or synthetic core sample. But experiment rock sample is excessive, and true reservoir drilling and coring delivery is generally 10cm cylinder, and specimen size can not meet the requirement of large-scale real triaxial waterfrac treatment simulation. Therefore, experiment is cored and is mainly built from rock outcrop or cement, can not react the sedimentation state of true core under formation condition. Meanwhile, owing to rock sample is relatively big, experimentation is complicated, waste time and energy. It is therefore desirable to a kind of small scale fracturing experimental installation of design, solve the problem that the rock core hydraulically created fracture crack initiation under true reservoir conditions cannot be simulated with extension.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of small volume hydraulic fracture three axle evaluation test pressurizing device, namely under formation conditions, full-hole core is simulated infusion mode, horizontal stress difference on the impact of fracture initiation and extension, by research, crack initiation and the extension situation in different levels stress-difference crack can be observed, crack initiation and the expansion in crack is monitored by acoustic emission device, so that it is determined that affect fracture initiation and the factor of extension, for pressing crack construction conceptual design is offered reference.
In order to realize above-mentioned purpose, the technical solution adopted in the utility model is:
A kind of small volume hydraulic fracture three axle evaluation test pressurizing device, comprise housing, housing two sides and connect X-axis direction loading and unloading body, Y-axis direction loading and unloading body, Z direction of principal axis loading and unloading body respectively below by through hole, X-axis direction loading and unloading body, loading and unloading body front end, Y-axis direction respectively connect a big plate, Z direction of principal axis loading and unloading body front end connection side's plate, inside, housing other two sides respectively connects one group of little plate by groove, housing top connects square cover plate by screw, below surrounding be provided with pillar stiffener.
Described X-axis direction loading and unloading body, Y-axis direction loading and unloading body, Z direction of principal axis loading and unloading body provide pressure difference by six-way valve and hydro-pump, can dismantle simultaneously, for simulating X, Y, Z-direction provide the mechanism of pressure difference to carry out simulated formation stress-difference.
Described case material is stainless steel, is of a size of 80mm × 80mm × 100mm.
Described big plate, little plate are respectively equipped with groove.
Described little plate one group is 2.
Rock sample is placed in the middle of described square plate and square cover plate, can carrying out the experiment test under different flow, select flow to be the low flow constant current constant voltage ram pump of 0～50ml/min, pressure range is 0～50MPa, constant current constant voltage ram pump plays provides steady liquid stream, and pressure reduction test acts on accurately.
It is provided with acoustic emission probe in described groove.
The beneficial effects of the utility model are:
1) the large-scale real triaxial fracture simulation laboratory apparatus of existing use large size outcrop rock sample is contrasted, the sample size that this device adopts is less, it is easy to processing, and it is directly take from the sample of goal in research reservoir, have more research than rock sample of appearing representative. Crack initiation and the expansion in crack in reservoir can be effectively simulated, by changing the condition such as infusion mode, horizontal stress difference, on the impact of fracture initiation and expansion under the different condition of research by this device.
2) after the test rock sample need not be destroyed, or use expensive high energy CT scan the fracture morphology of rock sample inside to be analyzed. Not only one can be had to describe intuitively the final form of rock sample internal fissure in conjunction with acoustic emission monitoring system, but also the process of fracture initiation and expansion can be analyzed.
3) apparatus structure is reasonable in design, and assembly and disassembly is convenient, is convenient to observe, clean after experiment, and each parts of system have good pressure-resistant stopping property.
4) the necessary instrument equipment of high standard it is configured with, it is ensured that the accuracy of experiment test.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 of the present utility model overlooks cross-sectional schematic.
Fig. 3 is big plate schematic diagram of the present utility model.
Fig. 4 is little plate schematic diagram of the present utility model.
Wherein, 1 is housing; 2 side's of being plates; 3 is big plate; 4 is little plate; 5 is X-axis direction loading and unloading body; 6 is Z direction of principal axis loading and unloading body; 7 is Y-axis direction loading and unloading body; 8 is groove; 9 is square cover plate; 10 for supporting.
Embodiment
By the following examples the utility model is described further, but the utility model is not limited to these embodiments.
As shown in Figure 1, 2, a kind of small volume hydraulic fracture three axle evaluation test pressurizing device, comprise housing 1, housing 1 two sides and connect X-axis direction loading and unloading body 5, Y-axis direction loading and unloading body 7, Z direction of principal axis loading and unloading body 6 respectively below by through hole, X-axis direction loading and unloading body 5, loading and unloading body 7 front end, Y-axis direction respectively connect a big plate 3, Z direction of principal axis loading and unloading body 6 front end connection side's plate 2, housing 1 respectively connects one group little plate 4 by groove in inside, two sides in addition, housing 1 top connects square cover plate 9 by screw, below surrounding be provided with pillar stiffener 10.
Described X-axis direction loading and unloading body 5, Y-axis direction loading and unloading body 7, Z direction of principal axis loading and unloading body 6 provide pressure difference by six-way valve and hydro-pump, can dismantle simultaneously, 3 of X-axis, Y-axis, Z axle surely round 8 for simulating X, Y, Z-direction provide the mechanism of pressure difference to carry out simulated formation stress-difference.
Described housing 1 material is stainless steel, is of a size of 80mm × 80mm × 100mm.
Big plate 3, little plate 4 as described in Fig. 3,4 are respectively equipped with groove 8.
Described little plate 4 one groups is 2.
Rock sample is placed in the middle of described square plate 2 and square cover plate 9, the experiment test under different flow can be carried out, flow has been selected to be the low flow constant current constant voltage ram pump of 0～50ml/min, pressure range is 0～50MPa, constant current constant voltage ram pump plays provides steady liquid stream, and pressure reduction test acts on accurately.
It is provided with acoustic emission probe in described groove 8.
Principle of work of the present utility model is:
1) the target reservoir to be studied is carried out drilling and coring delivery, the rock sample of taking-up is processed into the rectangular parallelepiped of 80mm × 80mm × 100mm, a diameter 1.5mm is drilled through at the middle part on rock sample top, the hole of dark 75mm, the bottom 45mm space to be preserved in hole is bore hole section, and then epoxy resin by the wellbore hole simulator high strength of fluid injection is adhesive in above bore hole section, and when preventing fluid injection, liquid spills from well head and causes pressure release, in order to make pit shaft bond, carve screw thread at the outer wall of pit shaft;
2) by big plate and little plate insertion housing, and the groove that to be placed on each plate by 16 acoustic emission probes reserved, then the rock sample processed is placed in housing, the square cover plate on top is screwed, by the hydraulic efficiency piston in three directions to rock sample load required for stress, it is possible to simulation actual reservoir stress condition;
3) from pit shaft, fracturing liquid is injected to rock sample, different injection speeds can be regulated by injection pump, injection pressure is carried out monitoring record by whole experimentation, pressure history is studied after experiment, when injection pressure reaches the parting pressure of rock, rock interior starts to produce crack, the generation in crack and expansion process can produce sound event, these events can be positioned by acoustic emission monitoring system, result gathers the most at last, it is possible to obtain the process of progress of fracture and final aspect graph.
Following according to aforesaid method, carry out following experiment:
Rock core is processed as the size of 80mm × 80mm × 100mm to put into housing, first X-direction is carried out level pressurization by hydro-pump, after X-direction has been pressurizeed, close the valve of the corresponding X-direction of six-way valve; Then Y-direction is pressurizeed, after Y-direction has been pressurizeed, close the valve of the corresponding Y-direction of six-way valve; Z-direction is pressurizeed, Z-direction closes the valve of the corresponding Z-direction of six-way valve after having pressurizeed, connect pipeline, and whether detection has liquid to ooze out, if nothing, constant flow pump is set as required constant rate, carries out fracture simulation test, when rock interior starts to produce crack, the generation in crack and expansion process can produce sound event, can these events being positioned by acoustic emission monitoring system, result gathers the most at last, it is possible to obtain the process of progress of fracture and final aspect graph.
Claims (7)
1. a small volume hydraulic fracture three axle evaluation test pressurizing device, comprise housing (1), it is characterized in that, housing (1) two sides and connect X-axis direction loading and unloading body (5) respectively below by through hole, Y-axis direction loading and unloading body (7), Z direction of principal axis loading and unloading body (6), X-axis direction loading and unloading body (5), loading and unloading body (7) front end, Y-axis direction respectively connects a big plate (3), Z direction of principal axis loading and unloading body (6) front end connection side's plate (2), housing (1) respectively connects one group of little plate (4) by groove in inside, two sides in addition, housing (1) top connects square cover plate (9) by screw, surrounding is provided with pillar stiffener (10) below.
2. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 1, it is characterized in that, X-axis direction loading and unloading body (5), Y-axis direction loading and unloading body (7), Z direction of principal axis loading and unloading body (6) provide pressure difference by six-way valve and hydro-pump, can dismantle simultaneously, for simulating X, Y, Z-direction provide the mechanism of pressure difference to carry out simulated formation stress-difference.
3. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 1, it is characterised in that, described housing (1) material is stainless steel, is of a size of 80mm × 80mm × 100mm.
4. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 1, it is characterised in that, described big plate (3), little plate (4) are respectively equipped with groove (8).
5. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 1, it is characterised in that, described little plate (4) groups is 2.
6. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 1, it is characterized in that, rock sample is placed in the middle of described square plate (2) and square cover plate (9), the experiment test under different flow can be carried out, flow has been selected to be the low flow constant current constant voltage ram pump of 0～50ml/min, pressure range is 0～50MPa, and constant current constant voltage ram pump plays provides steady liquid stream, and pressure reduction test acts on accurately.
7. a kind of small volume hydraulic fracture three axle evaluation test pressurizing device according to claim 4, it is characterised in that, it is provided with acoustic emission probe in described groove (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520986416.5U CN205317587U (en) | 2015-12-03 | 2015-12-03 | Small -size hydraulic fracturing triaxial evaluation test pressure device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520986416.5U CN205317587U (en) | 2015-12-03 | 2015-12-03 | Small -size hydraulic fracturing triaxial evaluation test pressure device |
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| CN205317587U true CN205317587U (en) | 2016-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352811A (en) * | 2015-12-03 | 2016-02-24 | 西安石油大学 | Pressurizing device and method for small-sized hydrofracture three-axis assessment and test |
| CN106401551A (en) * | 2016-10-21 | 2017-02-15 | 中国石油大学(北京) | Simulation experiment system for staged fracturing or simultaneous fracturing of horizontal wells |
-
2015
- 2015-12-03 CN CN201520986416.5U patent/CN205317587U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352811A (en) * | 2015-12-03 | 2016-02-24 | 西安石油大学 | Pressurizing device and method for small-sized hydrofracture three-axis assessment and test |
| CN106401551A (en) * | 2016-10-21 | 2017-02-15 | 中国石油大学(北京) | Simulation experiment system for staged fracturing or simultaneous fracturing of horizontal wells |
| CN106401551B (en) * | 2016-10-21 | 2018-03-13 | 中国石油大学(北京) | A kind of staged fracturing of horizontal well or synchronous pressure break experimental system for simulating |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160615 Termination date: 20191203 |
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| CF01 | Termination of patent right due to non-payment of annual fee |