CN105241750B - Pressurized head systems for indoor three axle hydraulic fracturings experiment - Google Patents

Pressurized head systems for indoor three axle hydraulic fracturings experiment Download PDF

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Publication number
CN105241750B
CN105241750B CN201510821393.7A CN201510821393A CN105241750B CN 105241750 B CN105241750 B CN 105241750B CN 201510821393 A CN201510821393 A CN 201510821393A CN 105241750 B CN105241750 B CN 105241750B
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China
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experiment
indoor
pressure head
top contact
sealing joint
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Expired - Fee Related
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CN201510821393.7A
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Chinese (zh)
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CN105241750A (en
Inventor
王俊
谢凌志
谢和平
卢卫民
何柏
任利
罗毅
文尧顺
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China Shenhua Coal to Liquid Chemical Co Ltd
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Sichuan University
China Shenhua Coal to Liquid Chemical Co Ltd
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Abstract

For the pressurized head systems of indoor three axle hydraulic fracturings experiment, it is related to a kind of pressurized head systems, to overcome the shortcomings that pressure head sample preparation that three axle crushing tests use in the prior art is time-consuming, complex operation and experiment post processing are complicated.Including presser unit, rubber seal and nut, the presser unit is integral type structure, include top contact, main body pressure head, lower pipeline and the bottom taper sealing joint being sequentially connected successively, top contact, main body pressure head, lower pipeline and bottom taper sealing joint are all to be coaxially disposed and central axis is axially arranged with through hole along it, top contact outer surface is provided with groove, and the rubber seal to match with it is provided with groove;Bottom taper sealing joint outer surface is provided with external screw thread, and the nut matches with external screw thread.The present invention can quickly and efficiently complete indoor three axle hydraulic fracturings experiment, good sealing effect, effectively can prevent compression fluid from leaking, suitable for indoor single shaft or three axle crushing tests.

Description

Pressurized head systems for indoor three axle hydraulic fracturings experiment
Technical field
The present invention relates to a kind of pilot system, is used to realize three axle hydraulic fracturing in fragile material room more particularly, to one kind The pressurized head systems of experiment.
Background technology
Day with energy situation is becoming tight, and the unconventional energy resource such as tight gas, coal bed gas and shale gas causes the world In the range of extensive concern.Because unconventionaloil pool reservoir has the low yield feature of " low porosity and low permeability ", using hydraulic fracturing as representative Fracturing technique turn into realize unconventionaloil pool exploitation Main Means.Although current a handful of countries have been provided with unconventional The ability that oil gas is commercially produced, but hydraulic fracturing mechanism is not clear and cost it is too high be still a global problem.Especially It is that fracturing under live complex stress, complex geological condition is even more to be difficult to prediction and control, now indoor three axle waterpower pressures It is cleaved into explore the key foundation of fracturing mechanism, designs simple efficient indoor fracturing unit and seem very necessary.
Current three axles crushing test is confined to true triaxial crushing test, however, true triaxial test equipment cost is too high and phase Pass technology is immature, and this method requires too high to rock sample, typically using 300mm × 300mm × 300mm large-scale cube rock Sample, the fracturing mechanism for taking time and effort and obtaining be not apparent.Therefore, it is necessary to which one kind is for small size pressure break test specimen (i.e. rock sample) Three axle crushing test systems of indoor vacation, such as use the diameter of International Rock mechanics association (ISRM) recommendation × highly for 50mm × 100mm standard specimen.Compared to single shaft pressure break, test apparatus and its high pressure sealing performance, the interior of fragile material are limited to False three axle hydraulic fracturings rarely have related data.At the same time, common experiment sealing means are tightly connected pressure using seccotine Split test specimen and pressure head, to prevent fluid from leaking, but this method cause time-consuming sample preparation, complex operation and test after need high temperature or sharp Device handles pressure head viscose glue.As can be seen here, a kind of simple to operate, good airproof performance and adaptable indoor three axles crushing test are needed badly Pressure head, now mechanical field use lateral seal and taper sealing principle turn into break-through point.
The content of the invention
The technical problems to be solved by the invention are to fill up the blank of indoor false three axle crushing tests, and are overcome existing The shortcomings that sample preparation caused by seccotine sealing means is time-consuming in technology, complex operation and experiment post processing are complicated, there is provided Yi Zhongyong It is simple, easy to operation in the pressurized head systems that three axle hydraulic fracturings in fragile material room are tested, the pressure head structure.
The technical solution adopted for the present invention to solve the technical problems is:Pressure head for indoor three axle hydraulic fracturings experiment System, including presser unit, rubber seal and nut, the presser unit are integral type structure, successively including top contact, Main body pressure head, lower pipeline and bottom taper sealing joint, top contact, main body pressure head, lower pipeline and bottom taper sealing Joint is all to be coaxially disposed and central axis is axially arranged with through hole along it, and top contact outer surface is provided with groove, set on groove It is equipped with the rubber seal to match with it;Bottom taper sealing joint outer surface is provided with external screw thread, the nut and external screw thread Match.
Specifically, the top contact, main body pressure head, lower pipeline and bottom taper sealing joint are all cylinder knot Structure.
Specifically, the groove is several, top contact outer surface is disposed on.
Further, the external diametrical extent of the top contact is 5~10mm, the main body pressure head external diameter be 50mm or 100mm。
Preferably, the material of the presser unit is 304 stainless steels.
Preferably, the groove is semi-circular recesses.
Specifically, the inner surface of the bottom taper sealing joint is provided with internal thread, internal thread connects with inner conical surface.
The beneficial effects of the invention are as follows:It is simple in construction, it is easy to process, it can quickly and efficiently complete indoor three axle waterpower It crushing test, good sealing effect, effectively can prevent compression fluid from leaking, greatly improve dress sample and unload the speed of sample, reduce people Power, material resources and leeway.The present invention is applied to the indoor single shaft or three axle pressures of different fluid pressure break and different fragile materials Split experiment.
Brief description of the drawings
Fig. 1 is structural representation of the present invention with pressure break test specimen when supporting;
Fig. 2 is the structural representation of presser unit in the present invention;
Fig. 3 is that taper sealing joint in bottom is connected structural representation when using with external pipe and nut in the present invention;
Fig. 4 is the structural representation of rubber seal in the present invention;
Fig. 5 is the structural representation of hex nut in the present invention;
Wherein, 1 is presser unit, and 2 be rubber seal, and 3 be nut, and 4 be top contact, and 41 be semi-circular recesses, and 5 are Main body pressure head, 6 be lower pipeline, and 7 be bottom taper sealing joint, and 71 be inner conical surface, and 72 be internal thread, and 73 be external screw thread, and 8 are Through hole, 9 be pressure break test specimen, and 10 be external pipe.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is described in detail.
It is close for the pressurized head systems of indoor three axle hydraulic fracturings experiment, including presser unit 1, rubber as shown in Fig. 1~2 Seal 2 and nut 3, the presser unit 1 are integral type structure, successively include be sequentially connected top contact 4, main body pressure head 5, Lower pipeline 6 and bottom taper sealing joint 7.I.e. top contact 4, main body pressure head 5, lower pipeline 6 and bottom taper sealing connect First 7 are the integrated design, overall processing, and guarantee has good sealing.Top contact 4, main body pressure head 5, lower pipeline 6 and bottom Portion's taper sealing joint 7 is all to be coaxially disposed, i.e., is set with central shaft, and central axis is axially arranged with through hole along it, so as to In from the bottom of presser unit 1 inject fluid.The center of presser unit is central shaft, illustrates through hole along top contact 4, master The central shaft of body pressure head 5, lower pipeline 6 and bottom taper sealing joint 7 is set, and these parts are all penetrated by through hole.By In rock mechanics experiment pressure head be all typically all cylinder, therefore above-mentioned top contact 4, main body pressure head 5, lower pipeline 6 and Bottom taper sealing joint 7 is preferably all cylindrical structure, i.e., central axis carries the cylinder of through hole.
Top contact 4 is used to be connected pressure break test specimen, and the outer surface of top contact 4 is provided with groove, be provided with groove and Its rubber seal 2 to match.In order to ensure sealing effectiveness, the groove is several, is disposed on outside top contact 4 Surface collectively constitutes lateral seal joint by being spaced apart rubber seal 2, for the pressure break test specimen being connected in Fig. 1. Due to the limited height of top contact 4, groove number is preferably 2 or 3.Pressure break test specimen uses pressure break of the prior art Test specimen, centre-drilling hole is designed with pressure break test specimen, during specifically used, pressure break test specimen is placed on what the present invention designed Pressurized head systems top, directly it is socketed at the top of presser unit.Preferably, because matched rubber sealing ring is annulus Shape, therefore the groove is semi-circular recesses 41.The structure of the rubber seal 2 to match with it as shown in figure 4, middle vacancy just It can be nested on semi-circular recesses 41 well, both are fully bonded.The external diameter of rubber seal 2 should be slightly larger than the center of pressure break test specimen The diameter of drilling, so as to be brought into close contact the purpose for reaching lateral seal.The pressure break that the number of rubber seal 2 is injected according to experiment Fluid pressure and sealing effectiveness determine.Such as it is arranged at intervals using the rubber seal 2 of two fluorubber materials, quantity is few, saves Cost and sealing effectiveness can be strengthened.
Lower pipeline 6 is used to connect main body pressure head 5 and bottom taper sealing joint 7, bottom taper sealing joint 7 and with Connected in the external pipe 10 that fluid is injected into through hole 8, the external pipe 10 is the outside provided with taper sealing nut Pipeline.
As shown in figure 3, bottom taper sealing joint 7 realizes the institute of the present invention using existing taper sealing joint can The function of the part needed, its inner surface are provided with internal thread 72, and internal thread 72 connects with inner conical surface 71, connected by taper sealing External pipe injection fluid injection, the outer surface of bottom taper sealing joint 7 is provided with external screw thread, the nut and external screw thread phase Match somebody with somebody, in specific test operation, presser unit 1 can will be fixed on experiment machine table top, the size of nut 3 by installing nut 3 Determined by tester structure.
The external diameter of top contact 4 is slightly less than the diameter of pressure break test specimen centre-drilling hole, so that top can smoothly install pressure break test specimen; The size of surface semi-circular recesses 41 depends on the size of rubber seal 2, and both should fully be bonded;The external diameter of main body pressure head 5 with Pressure break test specimen external diameter is identical, and the external diameter and length of lower pipeline 6 are used for the clear size of opening for laying pressure head by experiment machine table top center Determine;The internal thread of bottom taper sealing joint 7 and the matching connection external pipe taper joint of inner conical surface 71, it is necessary to assure the conical surface fills Light splitting is sliding complete, realizes the taper sealing function in hyperbaric environment.The external diameter of top contact 4 and main body pressure head 5 should be with actual pressure Test specimen is split to match, it is required that the external diameter of top contact matches with the centre-drilling hole diameter of pressure break test specimen during use, although The pressure break test specimen of code requirement standard is diameter × be highly 50mm × 100mm specification, but can also use diameter × height For 100mm × 200mm, and the conventional diameter of the centre-drilling hole of pressure break test specimen is 5mm, therefore, the external diameter model of the top contact 4 Enclose for 5~10mm, but multi-purpose external diameter is 5mm., will with rock mechanics specification and the external diameter of main body pressure head 5 is generally 50mm or 100mm The size for the axle test specimen of standard three asked matches.
As shown in figure 5, the internal thread of nut 3 matches with the external screw thread 73 of bottom taper sealing joint 7, for by pressure head list Member 1 is fixed on experiment machine table top.The nut 3 uses hexagonal (hexagon)nut, and its external diameter should be big by the through hole at experiment machine table top center Small decision.
High-strength corrosion-resistant erosion steel, such as the material such as 304 conventional stainless steels can be selected in the material of presser unit 1 and nut 3 Matter, so as to be used in three axle hyperbaric environments, and keep longer service life.
It is as follows using the detailed process of this pressurized head systems in specific indoor three axle hydraulic fracturings experiment implementation process:
A. according to the centre-drilling hole size of pressure break test specimen, the rubber seal that external diameter is matched is placed in presser unit In the groove of top contact, and check the compactness of both fittings;
B. according to the construction of new triaxial test equipment, the pressure by the lower pipeline of pressurized head systems through experiment machine table top center Head lays through hole, ensures that main body pressure head is brought into close contact experiment machine table top, then sets up nut simultaneously on afterbody taper sealing joint Tighten, pressurized head systems are fixed on testing machine using grip force between nut and main body pressure head;
C., afterbody taper sealing joint is connected to the external pipe of fluid injection, joint is tightened and fully ensures that the conical surface fills Divide fitting, ensure effective sealing of junction, so far pressurized head systems installment work is fully completed;
D. according to test requirements document, the pressure break test specimen for putting three axilemmas is directed at upper connection, slowly rotation to upper connection Completely into the centre-drilling hole of pressure break test specimen, the integrality and sealing of rubber seal are should be guaranteed that when filling sample;
E. start to apply certain axle power to fix pressure break test specimen, fall testing machine triaxial chamber and apply confined pressure by test requirements document To predeterminated level, then by the slow water filling of external pipe and apply hydraulic pressure, until completing crushing test;
F. pressure break test specimen, repeat step D and step E are removed after the completion of testing, completes three axle waterpower of this group of pressure break test specimen Crushing test.
Above method enables to that after crushing test terminates in first time, pressure break test specimen can be directly removed from top, after It is continuous to set up the pressure break test specimen with centre-drilling hole and tested, effectively avoid dismantling pressure head and high temperature or sharp instrument processing viscose glue repeatedly It is complicated poorly efficient, while can guarantee that injection high-pressure fluid sealing, greatly improve test operation efficiency.
It is exactly single shaft situation, i.e., single shaft is the special circumstances of three axles when three axle confined pressures become 0.Therefore the technical program Pressurized head systems be also applied for single shaft situation.Although present engineering is leading using hydraulic fracturing, the technical program can also fit For other pressure break media, such as other liquid or gas.

Claims (5)

1. the pressurized head systems for indoor three axle hydraulic fracturings experiment, it is characterised in that including presser unit (1), rubber seal It is integral type structure to enclose (2) and nut (3), the presser unit (1), successively including top contact (4), main body pressure head (5), under Portion's pipeline (6) and bottom taper sealing joint (7), top contact (4), main body pressure head (5), lower pipeline (6) and bottom taper Seal nipple (7) is all to be coaxially disposed and central axis is axially arranged with through hole along it;Top contact (4) outer surface is provided with recessed Groove, the groove are several, are disposed on top contact (4) outer surface, the rubber to match with it is provided with groove Sealing ring (2);Bottom taper sealing joint (7) outer surface is provided with external screw thread, and the nut matches with external screw thread, the top Joint (4), main body pressure head (5), lower pipeline (6) and bottom taper sealing joint (7) are all cylindrical structure.
2. the pressurized head systems as claimed in claim 1 for being used for indoor three axle hydraulic fracturings experiment, it is characterised in that the top The external diametrical extent of joint is 5~10mm, and main body pressure head (5) external diameter is 50mm or 100mm.
3. the pressurized head systems as claimed in claim 1 for being used for indoor three axle hydraulic fracturings experiment, it is characterised in that the pressure head The material of unit is 304 stainless steels.
4. the pressurized head systems as claimed in claim 1 for being used for indoor three axle hydraulic fracturings experiment, it is characterised in that the groove For semi-circular recesses (41).
5. the pressurized head systems as claimed in claim 1 for being used for indoor three axle hydraulic fracturings experiment, it is characterised in that the bottom The inner surface of taper sealing joint (7) is provided with internal thread, and internal thread connects with inner conical surface.
CN201510821393.7A 2015-11-24 2015-11-24 Pressurized head systems for indoor three axle hydraulic fracturings experiment Expired - Fee Related CN105241750B (en)

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CN107796694A (en) * 2017-09-27 2018-03-13 中南大学 A kind of high temperature triaxial core hydraulic fracture clamper and its application method
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Inventor after: Wang Jun

Inventor after: Xie Lingzhi

Inventor after: Xie Heping

Inventor after: Lu Weimin

Inventor after: He Bai

Inventor after: Ren Li

Inventor after: Luo Yi

Inventor after: Wen Yaoshun

Inventor before: Wang Jun

Inventor before: Xie Lingzhi

Inventor before: Xie Heping

Inventor before: He Bai

Inventor before: Ren Li

Inventor before: Luo Yi

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Effective date of registration: 20171215

Address after: 610044 South No. 24, Wuhou District first ring road, Chengdu, Sichuan

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Applicant after: China Shenhua Coal to Liquid and Chemical Co., Ltd.

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