CN105241750A - Pressing head system for indoor triaxial hydrofracture experiment - Google Patents

Pressing head system for indoor triaxial hydrofracture experiment Download PDF

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Publication number
CN105241750A
CN105241750A CN201510821393.7A CN201510821393A CN105241750A CN 105241750 A CN105241750 A CN 105241750A CN 201510821393 A CN201510821393 A CN 201510821393A CN 105241750 A CN105241750 A CN 105241750A
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China
Prior art keywords
indoor
pressing head
axle
top contact
experiment
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CN201510821393.7A
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CN105241750B (en
Inventor
王俊
谢凌志
谢和平
何柏
任利
罗毅
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China Shenhua Coal to Liquid Chemical Co Ltd
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Sichuan University
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Abstract

The invention relates to a pressing head system, in particular to a pressing head system for an indoor triaxial hydrofracture experiment to overcome the defects that in the prior art, a pressing head adopted in the triaxial hydrofracture experiment consumes time in sample preparation, complex in operation and complex in experiment aftertreatment. The pressing head system comprises a pressing head unit, rubber sealing rings and a nut, the pressing head unit is of an integral structure, and sequentially comprises a top connector, a body pressing head, a lower pipeline and a bottom tapered sealing connector which are connected in sequence. The top connector, the body pressing head, the lower pipeline and the bottom tapered sealing connector are all coaxially arranged, through holes are formed in the center axes in the axial direction, grooves are formed in the outer surface of the top connector, and the rubber sealing rings matched with the grooves are arranged in the grooves. An external thread is arranged on the outer surface of the bottom tapered sealing connector, and the nut is matched with the external thread. According to the pressing head system, the indoor triaxial hydrofracture experiment can be completed fast and efficiently, the sealing effect is good, pressed fluid can be effectively prevented from being leaked, and the pressing head system is suitable for the indoor uniaxial or triaxial hydrofracture experiment.

Description

For the pressurized head systems of indoor three axle waterfrac treatment tests
Technical field
The present invention relates to a kind of pilot system, especially relating to a kind of pressurized head systems for realizing the indoor three axle waterfrac treatment tests of hard brittle material.
Background technology
Along with the day of energy situation is becoming tight, the unconventional energy resource such as such as tight gas, coal-seam gas and shale gas cause worldwide extensive concern.Because unconventionaloil pool reservoir has the low yield feature of " low porosity and low permeability ", be that the fracturing technique of representative has become the Main Means realizing unconventionaloil pool exploitation with waterfrac treatment.Although a handful of countries have possessed the ability that unconventionaloil pool is commercially produced at present, waterfrac treatment mechanism is not clear and high cost remains a global problem.Fracturing particularly under on-the-spot complex stress, complex geological condition is difficult to control and prediction especially, and now indoor three axle waterfrac treatments become the key foundation exploring fracturing mechanism, and the efficient indoor fracturing unit of simplicity of design seems very necessary.
Current three axial compressions are split Pilot office and are limited to true triaxial crushing test, but, true triaxial test equipment high cost and correlation technique is immature, the method requires too high to rock sample, the large-scale cube rock sample of general employing 300mm × 300mm × 300mm, takes time and effort and the fracturing mechanism obtained is undistinct.Therefore, need false three axial compressions in a kind of indoor for small size pressure break test specimen (i.e. rock sample) to split pilot system, as the standard specimen of diameter × be highly 50mm × 100mm of adopting International Rock mechanics association (ISRM) to recommend.Compared to single shaft pressure break, be limited to test apparatus and high pressure sealing performance thereof, the false three axle waterfrac treatments in indoor of hard brittle material rarely have related data.Meanwhile, namely common test sealing means adopts seccotine to be tightly connected pressure break test specimen and pressure head, in case fluid is leaked, but the method causes that sample preparation is time-consuming, complicated operation and need high temperature or sharp instrument process pressure head viscose glue after test.As can be seen here, need a kind of simple to operate, good airproof performance badly and the pressure head of adaptable indoor three axle crushing tests, now the lateral seal used of mechanical field and taper sealing principle become breakthrough point.
Summary of the invention
Technical matters to be solved by this invention is the blank in order to fill up indoor false three axle crushing tests, and overcome that the sample preparation that in prior art, seccotine sealing means causes is time-consuming, complicated operation and the shortcoming of test aftertreatment complexity, there is provided a kind of pressurized head systems for the indoor three axle waterfrac treatment tests of hard brittle material, this pressure head structure is simple, convenient operation.
The technical solution adopted for the present invention to solve the technical problems is: for the pressurized head systems of indoor three axle waterfrac treatment tests, comprise presser unit, rubber seal and nut, described presser unit is integral type structure, comprise top contact, main body pressure head, lower pipeline and bottom taper sealing joint successively, top contact, main body pressure head, lower pipeline and bottom taper sealing joint are all coaxial setting and central axis is axially arranged with through hole along it, top contact outside surface is provided with groove, groove is provided with the rubber seal matched with it; Bottom taper sealing joint outside surface is provided with external thread, and described nut and external thread match.
Concrete, described top contact, main body pressure head, lower pipeline and bottom taper sealing joint are all cylindrical structure.
Concrete, described groove is several, is disposed on top contact outside surface.
Further, the external diametrical extent of described top contact is 5 ~ 10mm, and described main body pressure head external diameter is 50mm or 100mm.
Preferably, the material of described presser unit is 304 stainless steels.
Preferably, described groove is semi-circular recesses.
Concrete, the inside surface of described bottom taper sealing joint is provided with internal thread, and internal thread connects with inner conical surface.
The invention has the beneficial effects as follows: structure is simple, be easy to processing, indoor three axle waterfrac treatment tests can be completed fast, efficiently, good sealing effect, can effectively prevent compression fluid from leaking, greatly improve dress sample and the speed of unloading sample, reduce human and material resources and leeway.The present invention is applicable to indoor single shaft or the three axle crushing tests of different fluid pressure break and different hard brittle material.
Accompanying drawing explanation
Fig. 1 be the present invention and pressure break test specimen supporting time structural representation;
Fig. 2 is the structural representation of presser unit in the present invention;
Fig. 3 is that in the present invention, bottom taper sealing joint is connected structural representation when using with external pipe and nut;
Fig. 4 is the structural representation of rubber seal in the present invention;
Fig. 5 is the structural representation of hexagonal nut in the present invention;
Wherein, 1 is presser unit, and 2 is rubber seal, and 3 is nut, and 4 is top contact, 41 is semi-circular recesses, and 5 is main body pressure head, and 6 is lower pipeline, and 7 is bottom taper sealing joint, and 71 is inner conical surface, 72 is internal thread, and 73 is external thread, and 8 is through hole, and 9 is pressure break test specimen, and 10 is external pipe.
Embodiment
Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail.
As shown in Fig. 1 ~ 2, for the pressurized head systems of indoor three axle waterfrac treatment tests, comprise presser unit 1, rubber seal 2 and nut 3, described presser unit 1 is integral type structure, comprises the top contact 4, main body pressure head 5, lower pipeline 6 and the bottom taper sealing joint 7 that connect successively successively.Namely top contact 4, main body pressure head 5, lower pipeline 6 and bottom taper sealing joint 7 are the integrated design, and overall processing, ensures good sealing.Top contact 4, main body pressure head 5, lower pipeline 6 and bottom taper sealing joint 7 are all coaxial setting, and namely concentricity axle is arranged, and central axis is axially arranged with through hole along it, so that inject fluid from the bottom of presser unit 1.The center of presser unit is central shaft, and illustrate that through hole is arranged along the central shaft of top contact 4, main body pressure head 5, lower pipeline 6 and bottom taper sealing joint 7, these parts are all through by through hole.Because rock mechanics experiment pressure head is all generally all cylindrical, therefore above-mentioned top contact 4, main body pressure head 5, lower pipeline 6 and bottom taper sealing joint 7 are preferably all cylindrical structure, and namely central axis is with the right cylinder of through hole.
Top contact 4 is for being connected and fixed pressure break test specimen, and top contact 4 outside surface is provided with groove, groove is provided with the rubber seal 2 matched with it.In order to ensure sealing effectiveness, described groove is several, is disposed on top contact 4 outside surface and places rubber seal 2 composition lateral seal joint jointly, for being connected and fixed the pressure break test specimen in Fig. 1 by interval.Due to the limited height of top contact 4, groove number is preferably 2 or 3.Pressure break test specimen adopts pressure break test specimen of the prior art, and pressure break test specimen is all provided with centre-drilling hole, in concrete use procedure, pressure break test specimen is placed on the pressurized head systems top of the present invention's design, is directly socketed in presser unit top.Preferably, because the rubber sealing ring mated with it is circular, therefore described groove is semi-circular recesses 41.As shown in Figure 4, middle vacancy just in time can be nested on semi-circular recesses 41 structure of the rubber seal 2 matched with it, and both fully fit.Rubber seal 2 external diameter slightly larger than the diameter of the centre-drilling hole of pressure break test specimen, thus should fit tightly the object reaching lateral seal.The number of rubber seal 2 is determined according to the frac fluid pressure of test injection and sealing effectiveness.As adopted rubber seal 2 interval of two fluororubber materials to arrange, quantity is few, cost-saving and can enhanced leaktightness effect.
Lower pipeline 6 is for connecting main body pressure head 5 and bottom taper sealing joint 7, and bottom taper sealing joint 7 is connected with the external pipe 10 for injecting fluid in through hole 8 again, and described external pipe 10 is for being provided with the external pipe of taper sealing nut.
As shown in Figure 3, bottom taper sealing joint 7 uses existing taper sealing joint just can realize the function of these required parts of the present invention, its inside surface is provided with internal thread 72, internal thread 72 connects with inner conical surface 71, connect external pipe by taper sealing and inject fluid injection, bottom taper sealing joint 7 outside surface is provided with external thread, described nut and external thread match, in concrete test operation, by by mounting nuts 3, presser unit 1 can be fixed on testing machine table top, the size of nut 3 is determined by tester structure.
Top contact 4 external diameter is slightly less than the diameter of pressure break test specimen centre-drilling hole, so that pressure break test specimen can be installed smoothly in top; Surface semi-circular recesses 41 size depends on the size of rubber seal 2, and both should fully fit; Main body pressure head 5 external diameter is identical with pressure break test specimen external diameter, and the external diameter of lower pipeline 6 and length are determined for the clear size of opening laying pressure head by testing machine table top center; Bottom taper sealing joint 7 internal thread and inner conical surface 71 mate and connect external pipe taper joint, must ensure that the conical surface is abundant smooth complete, realize the taper sealing function in hyperbaric environment.The external diameter of top contact 4 and main body pressure head 5 should match with actual pressure break test specimen, the centre-drilling hole diameter making the external diameter of top contact and pressure break test specimen is needed to match during use, although the pressure break test specimen of code requirement standard is the specification that diameter × is highly 50mm × 100mm, but diameter × highly also can be adopted for 100mm × 200mm, and the diameter that the centre-drilling hole of pressure break test specimen is commonly used is 5mm, therefore, the external diametrical extent of described top contact 4 is 5 ~ 10mm, but multiplex external diameter is 5mm.And main body pressure head 5 external diameter is generally 50mm or 100mm, match with the size of the standard three axle test specimen of rock mechanics code requirement.
As shown in Figure 5, the internal thread of nut 3 mates with the external thread 73 of bottom taper sealing joint 7, for presser unit 1 is fixed on testing machine table top.Described nut 3 adopts hexagonal (hexagon)nut, and its external diameter should be determined by the hole size at testing machine table top center.
The material of presser unit 1 and nut 3 all can select high-strength corrosion-resistant to lose steel, and the materials such as 304 such as conventional stainless steels can use in three axle hyperbaric environments, and keep longer serviceable life.
In concrete indoor three axle waterfrac treatment test implementation process, utilize the detailed process of this pressurized head systems as follows:
A. according to the centre-drilling hole size of pressure break test specimen, the rubber seal matched by external diameter is placed in the groove of the top contact of presser unit, and the compactedness of laminating both checking;
B. according to the structure of new triaxial test equipment, the lower pipeline of pressurized head systems is laid through hole through the pressure head at testing machine table top center, ensure that main body pressure head fits tightly testing machine table top, then on afterbody taper sealing joint, set up nut and tighten, what utilize grip force between nut and main body pressure head is fixed on testing machine by pressurized head systems;
C. afterbody taper sealing joint is connected the external pipe being used for fluid and injecting, tighten joint and fully ensure that the conical surface is fully fitted, ensure the effective sealing of junction, so far pressurized head systems installment work all completes;
D. according to testing requirements, the pressure break test specimen putting three axilemmas is aimed at top sub, and slow circumvolve enters the centre-drilling hole of pressure break test specimen completely to top sub, should ensure integrality and the sealing of rubber seal during dress sample;
E. start to apply a dead axle power with fixing pressure break test specimen, fall testing machine triaxial chamber and apply confined pressure to predeterminated level by testing requirements, then applying hydraulic pressure, until complete crushing test by the slow water filling of external pipe;
F. take off pressure break test specimen after having tested, repeat step D and step e, complete three axle waterfrac treatment tests of this group pressure break test specimen.
Above method can make after first time, crushing test terminated, pressure break test specimen can be directly taken off from top, continue the pressure break test specimen set up with centre-drilling hole to test, effectively avoid the complicated poor efficiency repeatedly dismantling pressure head and high temperature or sharp instrument process viscose glue, the sealing injecting high-pressure fluid can be ensured simultaneously, greatly improve test operation efficiency.
When three axle confined pressures become 0, be exactly single shaft situation, namely single shaft is the special circumstances of three axles.Therefore the pressurized head systems of the technical program is also applicable to single shaft situation.Although engineering is taken as the leading factor with waterfrac treatment now, the technical program also goes for other pressure break media, as other liquid or gas.

Claims (7)

1. for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, comprise presser unit (1), rubber seal (2) and nut (3), described presser unit (1) is integral type structure, comprise top contact (4), main body pressure head (5), lower pipeline (6) and bottom taper sealing joint (7) successively, top contact (4), main body pressure head (5), lower pipeline (6) and bottom taper sealing joint (7) are all coaxial setting and central axis is axially arranged with through hole along it; Top contact (4) outside surface is provided with groove, groove is provided with the rubber seal (2) matched with it; Bottom taper sealing joint (7) outside surface is provided with external thread, and described nut and external thread match.
2. as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, described top contact (4), main body pressure head (5), lower pipeline (6) and bottom taper sealing joint (7) are all cylindrical structure.
3., as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, described groove is several, is disposed on top contact (4) outside surface.
4., as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, the external diametrical extent of described top contact is 5 ~ 10mm, and described main body pressure head (5) external diameter is 50mm or 100mm.
5., as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, the material of described presser unit is 304 stainless steels.
6., as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, described groove is semi-circular recesses (41).
7., as claimed in claim 1 for the pressurized head systems of indoor three axle waterfrac treatment tests, it is characterized in that, the inside surface of described bottom 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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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105628507A (en) * 2016-02-05 2016-06-01 四川大学 Hydraulic fracturing test apparatus based on conventional testing machine for rock mechanics, rock specimen and hydraulic fracturing testing method
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
CN112697671A (en) * 2020-12-07 2021-04-23 四川大学 Rock mass complex structural surface anisotropic seepage testing machine and testing method under deep-ground environment

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CN104807702A (en) * 2015-04-15 2015-07-29 陈琳 Experimental test method for hydraulic fracturing crack initiation behavior of coal and rock masses
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CN1063527A (en) * 1991-01-16 1992-08-12 玉门石油管理局石油沟油矿 High enegry gas fracturing process and control device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105628507A (en) * 2016-02-05 2016-06-01 四川大学 Hydraulic fracturing test apparatus based on conventional testing machine for rock mechanics, rock specimen and hydraulic fracturing testing method
CN105628507B (en) * 2016-02-05 2018-07-03 四川大学 The device of realization hydraulic fracturing experiments and rock sample and method in conventional rock mechanics experiment machine
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
CN112697671A (en) * 2020-12-07 2021-04-23 四川大学 Rock mass complex structural surface anisotropic seepage testing machine and testing method under deep-ground environment
CN112697671B (en) * 2020-12-07 2022-08-09 四川大学 Rock mass complex structural surface anisotropic seepage testing machine and testing method under deep-ground environment

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