CN206410979U - A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test - Google Patents

A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test Download PDF

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Publication number
CN206410979U
CN206410979U CN201720097303.9U CN201720097303U CN206410979U CN 206410979 U CN206410979 U CN 206410979U CN 201720097303 U CN201720097303 U CN 201720097303U CN 206410979 U CN206410979 U CN 206410979U
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pressure
gum cover
axle
splenium
ram shaft
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Inventor
陆朝晖
贺培
潘林华
程礼军
张烨
董兵强
康远波
王丹
蒙春
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Chongqing Institute of Geology and Mineral Resources
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Chongqing Institute of Geology and Mineral Resources
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Abstract

The utility model is related to a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, it includes axle pressure cylinder body and rock sample packaging components, axle pressure cylinder body is provided with left ram shaft splenium part and right ram shaft splenium part, and loading passage is axially through left ram shaft splenium part and right ram shaft splenium part;Rock sample packaging components include forming confined pressure chamber between outer gum cover and interior gum cover, outer gum cover and axle pressure cylinder body;The internal face of interior gum cover has a plurality of rib;The left end of interior gum cover is provided with the left sealing gasket sticked on rock sample left side, and the left sealing gasket offers a centre bore;The right-hand member of interior gum cover is provided with the right sealing gasket sticked on rock sample right side, the left part of right ram shaft splenium part offers annular diversion trench, interior gum cover it is adjacent it is digonous between space and the annular diversion trench insertion, the annular diversion trench connected with loading passage by pod apertures.This programme solves same category of device can not complete hydraulic fracturing and the problem of permeability is tested under triaxial stress environment.

Description

A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test
Technical field
The utility model is related to core test equipment, specifically a kind of rock for being used to simulate hydraulic fracturing and permeability test Heart clamp holder.
Background technology
Developed for current oil and gas reservoir, particularly unconventional hypotonic oil and gas reservoir exploitation, hydraulic fracturing technology into For the technology of main raising recovery ratio.Research seems most important with Optimum Hydraulic pressure break parameters and Related Mechanism, Particularly in the every hydraulic fracturing technology of research, experiment initial condition and rock form can not be changed, before and after comparing pressure break Effect is particularly significant to studying, wherein, permeability is exactly to characterize one of important parameter of hydraulic fracturing before and after pressure break.
Currently, laboratory research fracturing effect, mainly goes to characterize from macrostate, lays particular emphasis on splitting in research fracturing process Slit state, crack are extended.Permeability test in before and after pressure break also rests on released state, it is difficult to reach in same experiment condition Under do not change basic experimental conditions measurement pressure break before and after permeability.The main cause for being difficult to realize this effect be currently without One kind can the environment such as simulated ground stress and temperature, while for simulate hydraulic fracturing and permeability test core holding unit. Existing rock core accommodates device and is primarily present following shortcoming:(1) part rock core blessing device is unable to simulated ground stress environment.(2) partly not Can be under simulated ground stress environment, the permeability before and after mini-frac can only test rock sample permeability under the conditions of without crustal stress. (3) part energy simulated ground stress environmental testing rock sample permeability, but do not reach the effect of simulation hydraulic fracturing.
The content of the invention
The purpose of this utility model is a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test of offer, It can solve the problem that the problem of same category of device can not complete hydraulic fracturing under triaxial stress environment and permeability is tested.
The technical solution of the utility model is as follows:
A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, including axle pressure cylinder body and it is arranged on institute The rock sample packaging components in axle pressure cylinder body are stated, the left end of the axle pressure cylinder body is provided with left ram shaft splenium part, axle pressure cylinder body Right part is provided with right ram shaft splenium part, and loading passage is axially through the left ram shaft splenium part and right ram shaft splenium Part;The rock sample packaging components include outer gum cover and interior gum cover, the two ends correspondence right ram shaft splenium part of the outer gum cover, Offered on left ram shaft splenium part connection and the formation confined pressure chamber between the axle pressure cylinder body, axle pressure cylinder body and the confined pressure chamber connects Logical confined pressure supply opening.The outside wall surface of the interior gum cover is cylinder and internal face phase when under confined pressure state with the outer gum cover Laminating, the internal face of interior gum cover is evenly distributed along the periphery the trapezoidal rib in a plurality of section, and these ribs are parallel with interior gum cover and court The top surface of inside gum cover central shaft is rock sample contact surface.The left side of interior gum cover and left ram shaft splenium part are in sealing contact, interior glue The left end of set is provided with the left sealing gasket sticked on rock sample left side, and the center of the left sealing gasket offers one and added with described Carry passage just to centre bore;The right side of interior gum cover and right ram shaft splenium part are in sealing contact, and the right-hand member of interior gum cover is provided with The right sealing gasket sticked on rock sample right side, the left part of right ram shaft splenium part offers the ring around the right sealing gasket Shape guiding gutter, interior gum cover it is adjacent it is digonous between space and the annular diversion trench insertion, the annular diversion trench and right ram shaft pressure The loading passage of part is connected by pod apertures.
Further, the axle pressure cylinder body has left end cover, and the left ram shaft splenium part includes left pressure head, left taper Set, left packing ring, adapter sleeve and axle pressure piston, the head of the left pressure head is towards the right side, and the axle pressure piston is set in the bar of left pressure head In portion, axle pressure piston and left pressure head left part run through axle pressure cylinder body left end cover, axle pressure piston left end side wall with It is tightly connected and is tightly connected between the right end sidewalls and axle pressure cylinder inboard wall of axle pressure piston between left end cover so that axle pressure is lived Formed to offer in an axle means of press seals chamber, left end cover between the right-hand member of plug and the left end cover and connect the axle means of press seals chamber Axial compressive force supply opening;Axle is pressed to be offseted between piston and the head of left pressure head by the left packing ring, and left packing ring is set in a left side In the bar portion of pressure head, the left coning sleeve is located in the axle pressure cylinder body and is set in the left part of left packing ring, left coning sleeve Right part is interference fitted with the outer gum cover, the external connection of the adapter sleeve on the outer surface of axle pressure cylinder body, adapter sleeve The internal left side with left coning sleeve offsets.
Further, the left sealing gasket has O-ring seal towards projection on the end face of the left pressure head.
Further, the right ram shaft splenium part includes right pressure head, right packing ring, small pressure cap, big pressure cap and right coning sleeve, The head of the right pressure head is towards a left side, and the small pressure cap is set in the bar portion of right pressure head, leads between small pressure cap and the head of right pressure head Cross the right packing ring to offset, right packing ring is set in the bar portion of right pressure head, the right coning sleeve be located at the axle pressure cylinder body in and The left part of right packing ring is set in, the left part of right coning sleeve is interference fitted with the outer gum cover, and the big pressure cap is set in the right side The left part of packing ring and it is connected between small pressure cap and axle pressure cylinder body.
Further, the right sealing gasket has O-ring seal towards projection on the end face of the right pressure head.
Further, a height of 2mm of the rib of the interior gum cover, a length of 4mm in bottom of rib, a length of 2mm in top of rib.
This programme designs gas-liquid seal structure in the end of rock sample packaging components, is led by left and right sealing gasket and annular The design of chute is sealed to axially and radially corner, can prevent gas or liquid from boundary leakage, makes gas or fluid from adding The left end for carrying passage enters after core holding unit, the central part full of rock sample, radial direction pressure break or infiltration, finally from interior gum cover inwall Space through annular diversion trench water conservancy diversion, from the right-hand member outflow of loading passage;Also it can avoid producing in boundary during simulation hydraulic fracturing Raw mechanics weak spot.
This core holding unit can either simulate the hydraulic fracturing under condition of triaxial stress, can not move again or change rock sample Permeability before and after experimental situation mini-frac, solve same category of device can not be completed under triaxial stress environment hydraulic fracturing and The problem of permeability test, can preferably evaluate the effect of hydraulic fracturing.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the schematic cross-section of rock sample packaging components of the present utility model;
Fig. 3 is interior gum cover expanded schematic diagram of the present utility model;
Fig. 4 is the top view of structure shown in Fig. 3;
The enlarged drawing that Fig. 5 is part A in Fig. 1;
Fig. 6 is sectional views of the B-B " on direction in Fig. 1.
Embodiment
The utility model will be further described with reference to the accompanying drawings and examples.
A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, a kind of concrete structure as shown in Figure 1, It includes axle pressure cylinder body 2 and the rock sample packaging components being arranged in the axle pressure cylinder body 2, and the left end of the axle pressure cylinder body 2 is set Left ram shaft splenium part is equipped with, the right part of axle pressure cylinder body 2 is provided with right ram shaft splenium part, and loading passage is axially through institute State left ram shaft splenium part and right ram shaft splenium part, left port 13 of the loading passage on left ram shaft splenium part for gas or The entrance of liquid loading, the outlet that right output port 17 of the loading passage on right ram shaft splenium part loads for gas or liquid.Institute Stating rock sample packaging components includes outer gum cover 8 and interior gum cover 9, the two ends correspondence right ram shaft splenium part of the outer gum cover 8, a left side Ram shaft splenium part connects and formed to offer on confined pressure chamber, axle pressure cylinder body 2 between the axle pressure cylinder body 2 to be connected with the confined pressure chamber Logical confined pressure supply opening 15.
Difference and prior art, as shown in Figures 2 to 4, the outside wall surface of the interior gum cover 9 is for cylinder and in confined pressure shape Internal face when under state with the outer gum cover 8 fits, and the internal face of interior gum cover 9 has been evenly distributed along the periphery a plurality of section in ladder The rib of shape, these ribs it is parallel with interior gum cover 9 and towards the interior central shaft of gum cover 9 top surface be rock sample contact surface.Axle pressure is applied with confined pressure Plus after, the top surface of rib is close to rock sample, supports confined pressure, the space between rib and rib provides flow channel for liquids and gases.Interior glue The left side of set 9 and left ram shaft splenium part are in sealing contact, and the left end of interior gum cover 9 is provided with the left side sticked on rock sample left side Sealing gasket 7, the center of the left sealing gasket 7 offer one with the loading passage just to centre bore;The right side of interior gum cover 9 In sealing contact with right ram shaft splenium part, the right-hand member of interior gum cover 9 is provided with the right sealing gasket 16 sticked on rock sample right side, right The left part of ram shaft splenium part offers the annular diversion trench 18 around the right sealing gasket 16, interior gum cover 9 it is adjacent it is digonous it Between space and the insertion of annular diversion trench 18, the loading passage of the annular diversion trench 18 and right ram shaft splenium part passes through water conservancy diversion Hole 19 is connected, as shown in Figure 5, Figure 6.
The loading of triaxial stress is pressurizeed by hydraulic oil, and pressure size provides device regulation by outer liquid force feed.Promote The forward axle pressure that provides of left and right ram shaft splenium part acts directly on rock sample end face, and confined pressure passes through the confined pressure in the middle part of core holding unit The hydraulic oil that supply opening 15 injects is provided, and is acted on outer gum cover 8, is transferred to interior gum cover 9 through outer gum cover 8 and realizes.It is supplied to rock The triaxial stress of sample is all internal force, it is not necessary to which external component is supported.Outer gum cover 8 is made using the slightly larger rubber of rigidity, interior glue Set 9 is made using hard rubber, and interior gum cover 9 can be changed at any time.By parts such as interior gum cover 9, left sealing gasket 7, right sealing gaskets 16 more Conventional permeability test component is changed to, the axial dispersion rate of rock sample when can test non-drill centers.
The diameter of rock sample centre drill one about Φ 3-5mm circular hole, core holding unit center provide a diameter of phi 2mm liquid with Gas-loaded passage.Rock sample axial dispersion rate experimental method is comprised the following steps that:
Step A1, prepares rock sample.By rock sample cutting machine, Φ 50mm, long 100mm sample are produced.
Step B1, changes experimental part.Interior gum cover 9, left part sealing gasket, right part sealing gasket in core holding unit are taken Go out, be replaced by the sealing gasket of conventional core permeability test.
Step C1, applies axle pressure and confined pressure.By external pressurized device, rock sample retainer shaft to radial through hydraulic pressure Oil applies pressure, and reaches experiment axle pressure and confined pressure predetermined value.
Step D1, tests permeability method testing rock core axial dispersion rate according to conventional core, axle is laid down after the completion of test Pressure and confined pressure, take out rock sample.
Radial direction permeability experimental method comprises the following steps that before and after rock sample pressure break:
Step A2, brill Φ 3-5mm circular hole in the middle of the rock sample for having tested axial dispersion rate and through rock sample, is superscribed interior Gum cover 9, and be put into rock sample clamper.
Step B2, applies axle pressure and confined pressure.By external pressurized device, rock sample retainer shaft to radial through hydraulic pressure Oil applies pressure, and reaches experiment axle pressure and confined pressure predetermined value.
Step C2, permeability before test rock sample hydraulic fracturing.The gas that two ends connect permeability test device is clamped in rock sample Fluid line, the parameter such as pressure value, flow in record experimentation the same with normal experiment test permeability method, further according to Radial Flow Through Porous Media formula calculates rock sample permeability value before pressure break.
Step D2, simulates hydraulic fracturing.Permeability test gas line is removed, hydraulic fracturing high-pressure fluid is directly connected to Pipeline, starts hydraulic fracturing experiments, completes after hydraulic fracturing experiments, lays down hydraulic pressure, removes hydraulic fracturing high pressure line.
Step E2, permeability after test rock sample hydraulic fracturing.Method is with step C2.
Rock sample is observed after step F2, hydraulic fracturing.Slowly lay down simultaneously after confined pressure and axle pressure, take out real from interior gum cover 9 is interior Rock sample is tested to observe and describe.
Specifically, the axle pressure cylinder body 2 has left end cover, the left ram shaft splenium part includes left pressure head 1, left taper Set 5, left packing ring 6, adapter sleeve 4 and axle pressure piston 3, the head of the left pressure head 1 is towards the right side, and the axle pressure piston 3 is set in left pressure In first 1 bar portion, the left end cover of axle pressure cylinder body 2 is run through in the left part of axle pressure piston 3 and left pressure head 1, axle pressure piston 3 It is tightly connected between left end side wall and left end cover and the company of sealing between the right end sidewalls and the inwall of axle pressure cylinder body 2 of axle pressure piston 3 Connect so that form the company of offering in an axle means of press seals chamber, left end cover between the right-hand member and the left end cover of axle pressure piston 3 Lead to the axial compressive force supply opening 14 of the axle means of press seals chamber;Axle is pressed passes through the left packing ring 6 between piston 3 and the head of left pressure head 1 Offset, left packing ring 6 is set in the bar portion of left pressure head 1, the left coning sleeve 5 is located in the axle pressure cylinder body 2 and is set in a left side The left part of packing ring 6, the right part of left coning sleeve 5 is interference fitted with the outer gum cover 8, and the external connection of the adapter sleeve 4 exists On the outer surface of axle pressure cylinder body 2, the inside of adapter sleeve 4 and the left side of left coning sleeve 5 offset.The left sealing gasket 7 is towards described Projection has O-ring seal to be used to seal on the end face of left pressure head 1.
The right ram shaft splenium part includes right pressure head 10, right packing ring 21, small pressure cap 12, big pressure cap 11 and right coning sleeve 20, the head of the right pressure head 10 is towards a left side, and the small pressure cap 12 is set in the bar portion of right pressure head 10, small pressure cap 12 and right pressure head 10 Head between offseted by the right packing ring 21, right packing ring 21 is set in the bar portion of right pressure head 10, the right coning sleeve 20 In the axle pressure cylinder body 2 and it is set in the left part of right packing ring 21, the left part of right coning sleeve 20 and the outer mistake of gum cover 8 It is full of cooperation, the big pressure cap 11 is set in the left part of right packing ring 21 and is connected between small pressure cap 12 and axle pressure cylinder body 2.Institute institute State right sealing gasket 16 has O-ring seal to be used to seal towards projection on the end face of the right pressure head 10.
A height of 2mm of the rib of the interior gum cover 9, a length of 4mm in bottom of rib, a length of 2mm in top of rib.Interior gum cover 9 can wrap up examination Part size is Φ 50mm × 100mm rock sample, can be by adjusting gum cover thickness moderately adjustment, diameter to adapt to different cavity sizes Effective adjusting range is 45-65mm, and the effective adjusting range of length is 45mm-105mm.

Claims (6)

1. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, including axle pressure cylinder body and it is arranged on described Rock sample packaging components in axle pressure cylinder body, the left end of the axle pressure cylinder body is provided with left ram shaft splenium part, the right side of axle pressure cylinder body End is provided with right ram shaft splenium part, and loading passage is axially through the left ram shaft splenium part and right ram shaft splenium Part;The rock sample packaging components include outer gum cover and interior gum cover, the two ends correspondence right ram shaft splenium part of the outer gum cover, Offered on left ram shaft splenium part connection and the formation confined pressure chamber between the axle pressure cylinder body, axle pressure cylinder body and the confined pressure chamber connects Logical confined pressure supply opening, it is characterised in that:The outside wall surface of the interior gum cover be cylinder and when under confined pressure state with the outer glue The internal face of set fits, and the internal face of interior gum cover is evenly distributed along the periphery the trapezoidal rib in a plurality of section, these ribs with it is interior Gum cover it is parallel and towards interior gum cover central shaft top surface be rock sample contact surface;
The left side of interior gum cover and left ram shaft splenium part are in sealing contact, and the left end of interior gum cover, which is provided with, sticks in rock sample left side On left sealing gasket, the center of the left sealing gasket offer one with the loading passage just to centre bore;The right side of interior gum cover End face and right ram shaft splenium part are in sealing contact, and the right-hand member of interior gum cover is provided with the right sealing gasket sticked on rock sample right side, The left part of right ram shaft splenium part offers the annular diversion trench around the right sealing gasket, interior gum cover it is adjacent it is digonous between Space and the annular diversion trench insertion, the annular diversion trench are connected with the loading passage of right ram shaft splenium part by pod apertures.
2. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 1, its feature It is:The axle pressure cylinder body has left end cover, and the left ram shaft splenium part includes left pressure head, left coning sleeve, left packing ring, company Female connector and axle pressure piston, the head of the left pressure head is towards the right side, and the axle pressure piston is set in the bar portion of left pressure head, axle pressure piston It is close between the left end side wall and left end cover of axle pressure piston and the left end cover of axle pressure cylinder body is run through in the left part of left pressure head Envelope connection and axle pressure piston right end sidewalls and axle pressure cylinder inboard wall between be tightly connected so that axle pressure piston right-hand member with it is described The axial compressive force feed flow for being offered in an axle means of press seals chamber, left end cover and connecting the axle means of press seals chamber is formed between left end cover Mouthful;Axle is pressed to be offseted between piston and the head of left pressure head by the left packing ring, and left packing ring is set in the bar portion of left pressure head, institute State the left part that left coning sleeve is located in the axle pressure cylinder body and is set in left packing ring, the right part of left coning sleeve and the outer glue Set interference fit, the external connection of the adapter sleeve is on the outer surface of axle pressure cylinder body, the inside of adapter sleeve and left coning sleeve Left side offsets.
3. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 2, its feature It is:The left sealing gasket has O-ring seal towards projection on the end face of the left pressure head.
4. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 1, its feature It is:The right ram shaft splenium part includes right pressure head, right packing ring, small pressure cap, big pressure cap and right coning sleeve, the right pressure head Head is towards a left side, and the small pressure cap is set in the bar portion of right pressure head, passes through the right packing ring between small pressure cap and the head of right pressure head Offset, right packing ring is set in the bar portion of right pressure head, the right coning sleeve is located in the axle pressure cylinder body and is set in right packing ring Left part, the left part of right coning sleeve is interference fitted with the outer gum cover, and the big pressure cap is set in the left part of right packing ring And be connected between small pressure cap and axle pressure cylinder body.
5. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 4, its feature It is:The right sealing gasket has O-ring seal towards projection on the end face of the right pressure head.
6. a kind of rock core folder for being used to simulate hydraulic fracturing and permeability test according to any one of claim 1 to 5 Holder, it is characterised in that:A height of 2mm of the rib of the interior gum cover, a length of 4mm in bottom of rib, a length of 2mm in top of rib.
CN201720097303.9U 2017-01-25 2017-01-25 A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test Active CN206410979U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107748241A (en) * 2017-10-25 2018-03-02 辽宁工程技术大学 A kind of hydraulic fracturing and gas outburst hazard simulation test device
CN108872043A (en) * 2018-07-06 2018-11-23 中国矿业大学(北京) The three axle clamp holders for three axis non-isothermal multiphase porous flow experimental system of deep soft rock
CN109959595A (en) * 2018-09-28 2019-07-02 中国石油天然气股份有限公司 The test method and device of permeability during compact reservoir waterpower sand fracturing
CN110018087A (en) * 2019-04-29 2019-07-16 中国石油大学(北京) A kind of device for simulating fracturing fluid two dimension leak-off
CN110529107A (en) * 2019-09-02 2019-12-03 重庆大学 Coal seam strain, seepage flow, displacement and jet stream integrated experiment device and method
CN110530771A (en) * 2019-09-02 2019-12-03 重庆大学 Pressure chamber is used in the test of coal petrography sample gas flow
CN110618072A (en) * 2019-09-06 2019-12-27 河南工程学院 Coal body crack monitoring-gas permeation experimental device
CN111220478A (en) * 2020-01-20 2020-06-02 中南大学 High-temperature high-pressure supercritical carbon dioxide rock core cracking test device
CN112665987A (en) * 2020-12-18 2021-04-16 西南石油大学 Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting
CN112986287A (en) * 2021-04-15 2021-06-18 中国科学院地质与地球物理研究所 Ultrahigh-pressure nonmetal core holder

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107748241A (en) * 2017-10-25 2018-03-02 辽宁工程技术大学 A kind of hydraulic fracturing and gas outburst hazard simulation test device
CN108872043A (en) * 2018-07-06 2018-11-23 中国矿业大学(北京) The three axle clamp holders for three axis non-isothermal multiphase porous flow experimental system of deep soft rock
CN109959595A (en) * 2018-09-28 2019-07-02 中国石油天然气股份有限公司 The test method and device of permeability during compact reservoir waterpower sand fracturing
CN110018087A (en) * 2019-04-29 2019-07-16 中国石油大学(北京) A kind of device for simulating fracturing fluid two dimension leak-off
CN110529107A (en) * 2019-09-02 2019-12-03 重庆大学 Coal seam strain, seepage flow, displacement and jet stream integrated experiment device and method
CN110530771A (en) * 2019-09-02 2019-12-03 重庆大学 Pressure chamber is used in the test of coal petrography sample gas flow
CN110618072A (en) * 2019-09-06 2019-12-27 河南工程学院 Coal body crack monitoring-gas permeation experimental device
CN111220478A (en) * 2020-01-20 2020-06-02 中南大学 High-temperature high-pressure supercritical carbon dioxide rock core cracking test device
CN111220478B (en) * 2020-01-20 2021-09-14 中南大学 High-temperature high-pressure supercritical carbon dioxide rock core cracking test device
CN112665987A (en) * 2020-12-18 2021-04-16 西南石油大学 Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting
CN112986287A (en) * 2021-04-15 2021-06-18 中国科学院地质与地球物理研究所 Ultrahigh-pressure nonmetal core holder

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