CN108999586A - Minor diameter rock mass hydrofracturing tests straddle packer - Google Patents

Minor diameter rock mass hydrofracturing tests straddle packer Download PDF

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Publication number
CN108999586A
CN108999586A CN201810905691.8A CN201810905691A CN108999586A CN 108999586 A CN108999586 A CN 108999586A CN 201810905691 A CN201810905691 A CN 201810905691A CN 108999586 A CN108999586 A CN 108999586A
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CN
China
Prior art keywords
packer
connector
mounting rod
hydrofracturing
double loop
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Pending
Application number
CN201810905691.8A
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Chinese (zh)
Inventor
王成虎
刘民
刘一民
高桂云
黄禄渊
王显军
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Institute of Crustal Dynamics of China Earthquake Administration
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Institute of Crustal Dynamics of China Earthquake Administration
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Application filed by Institute of Crustal Dynamics of China Earthquake Administration filed Critical Institute of Crustal Dynamics of China Earthquake Administration
Priority to CN201810905691.8A priority Critical patent/CN108999586A/en
Publication of CN108999586A publication Critical patent/CN108999586A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/122Multiple string packers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

The invention discloses a kind of minor diameter rock mass hydrofracturings to test straddle packer, including double loop mounting rod connector, a upper packer, a connector with hole for water spraying, a lower packet and a lower end cap;Double loop mounting rod connector, upper packer, the connector with hole for water spraying, lower packet and lower end cap are successively closely coupled.The beneficial effects of the present invention are: realizing the hydrofracturing In-situ stress measurements scheme in slim hole, this straddle packer has two kinds of specifications of Φ 30mm and Φ 39mm, structure is simple, it is convenient to assemble, and the test section sealing and the injection of highly pressurised liquid of hydrofracturing In-situ stress measurements in slim hole are realized by double loop mounting rod connector, upper packer, the connector with hole for water spraying, lower packet and lower end cap this five components.

Description

Minor diameter rock mass hydrofracturing tests straddle packer
Technical field
The present invention relates to a kind of minor diameter rock mass testing tools, specifically, being related to a kind of minor diameter rock mass hydrofracturing Test straddle packer.
Background technique
Hubbert and Willis proposes that crack caused by well bore fluid pressure break is answered with institute preservation in rock mass in nineteen fifty-seven Power state is closely related, and points out that rock mass pressure is not at hydrostatic pressure state.Kehle(1964) packer is isolated for the first time The stress distribution on wellhole periphery of experimental section carried out simple analysis, and point out that the influence of packer forms hole wall periphery and cuts Stressed zone.Fairhurst(1964 it is) first scientist for proposing to measure Original strata stress using hydrofracturing technology, and refers to The plurality of advantages of hydrofracturing technology is gone out.Haimson and Fairhurst(1967) point out the crack generated on the borehole wall with it is following Three factors are related, 1. crustal stress, 2. the poor stress between the fluid pressure and pore water pressure of hydrofracturing;3. rock mass seeps Saturating radial flow, these theory analysis have established the theoretical basis of classical hydrofracturing measuring technology.Haimson(1968) exist In its doctoral thesis to hydrofracturing Original strata stress measuring technology from experiment and theoretical two aspects carried out comprehensive analysis with it is complete It is kind.The above important process is that hydrofracturing Original strata stress measuring technology has established theory applied to engineering practice and tested base Plinth.The stress measurement engineering practice of real meaning is by Von Schonfeldt and Fairhurst(1970) study group of leader It is unfolded in a Minnesotan underground granitic mass;Then, similar stress has also been carried out in the oil field Rangely Measurement and research work (Haimson, 1973;Raleigh etc., 1976).From this, Hydraulic Fracturing Stress Measurements formally enter engineering Practice field.1987 and 2003, International Society of Rock Mechanics was all using hydrofracturing In-situ stress measurements method as one kind Main stress evaluation method is recommended, and has also established weight of the hydrofracturing In-situ stress measurements technology as stress test method Want status.
The geostress survey work of China is slightly later than foreign countries, and the fifties end, LI Si guang and professor Chen Zongji instruct respectively Geomechanics and Three Gorges batholith workshop start.In October, 1980, the study group led by professor Li Fangquan is in river Northern Yi County has successfully carried out hydraulic fracturing geostress survey (Li Fangquan, 1980) for the first time, and subsequent China Seismology Bureau's earth's crust is answered Power Research Institute success lightweight hydrofracturing measuring device (Li Fangquan, 1981;Ding Jianmin, 1990;An Qimei, 1996;Guo Qi Liang, 1999).Hydrofracturing measuring technology starts to be widely used popularization in all trades and professions of China.Up to the present, The main hydrofracturing test method that China uses abides by the method that International Society of Rock Mechanics is recommended.
Equipment about hydrofracturing In-situ stress measurements is broadly divided into five major class at present: (1) heavy duty cables formula hydraulic pressure causes In-situ stress measurements equipment is split, using Switzerland's MESY-SOLEXPERTS equipment as representative;(2) light cable type hydrofracturing original place Stress measurement equipment, mainly using the shallow bore hole test equipment of CSIR O of Japanese OYO company and Australia tissue manufacture as representative; (3 are tested hydrofracturing and other physical prospecting mud logging equipments with what French Cornet professor and U.S. professor Thiercelin made The novel hydrofracturing test equipment combined is representative;(4) it is surveyed with the BABHY of northeastern Japan university professor Ito manufacture Examination equipment is representative;(5) the widely used drilling rod formula hydrofracturing In-situ stress measurements equipment in Chinese range.All this In a little equipment, the smallest device diameters are the lightweight hydrofracturing In-situ stress measurements equipment of CSIR O tissue manufacture, and equipment is straight Diameter is Ф 36mm, is secondly the BABHY test equipment of professor's Ito manufacture, testing bore holes diameter is Ф 48mm.
Widely used measuring system is made of six parts at home, pressure fluid control system, high-pressure hydraulic pump, power System, digital data recording system, straddle packer and high-pressure fluid transportation system.This measuring system is divided into two classes again, a kind of It is the shallow bore hole for 100m, drilling rod and high pressure resistant hose can be used and realize pressure break to packer and fracturing section water supply respectively.Separately A kind of outer equipment is the longhole survey for 100m or more, and pressure fluid is supplied respectively to fracturing section and envelope using a switching valve Every device, measurement system diagram is as illustrated in fig. 1 and 2.Wherein: 40,30: drilling cramp, 41: high-pressure hose, 42,32: drilling rod is connected to test section, 43,33: adapter, 44,34: test section, 45,35: packer, 46,36: pressure sensor.
By the analysis of front it is found that there are no the hydrofracturing detecting earth stress systems that diameter is less than 36mm in the world at present System.But the hydrofracturing Original strata stress test macro of minor diameter has equipment light, requires low spy to test pressurized equipment The high-pressure oil pump pressurization of the annual compression system or two-phase electricity of high output pressure and low discharge can be used in point.At the same time, Requirement of the minor diameter test equipment to rockmass is low, for bigbore drilling, surveys according to International Society of Rock Mechanics Examination segment length should be 6 ~ 7 times of bore diameter, then adding for domestic conventional 76mm 94mm geological prospecting borehole Upper packer length 1.0m or so, then 245.6cm ~ 256.4cm is at least to the length of drilling rockmass, but for one For a diameter is the drilling of 32mm, it is only necessary to the rockmass length of about 99.2cm long, it is only original less than 40%, Under identical working condition, so that it may so that amount of test data has more more than one times.At the same time, the brill that drills makes expense can be with brill Hole aperture becomes smaller and reduces, this is greatly lowered the testing expense of Original strata stress, and the testing time of slim hole also can Shorten therewith, so that testing expense substantially reduces.Therefore, the research and development of minor diameter Original strata stress test equipment, for pushing Hydrofracturing In-situ stress measurements and promotion original technology upgrading innovation have important social effect and economic significance.
For minor diameter hydrofracturing test macro, the drilling rod used in conventional hydrofracturing Original strata stress is tested, The fixture diameters such as high-pressure rubber pipe are excessive, can not be installed into highly pressurised liquid and test equipment using original technological approaches predetermined Position.The present invention uses existing technology path, using double back line structure, by two circuits in packer give respectively fracturing section and Packer sealing section provides highly pressurised liquid, designs and manufacture the straddle packer of minor diameter hydrofracturing test device.
Summary of the invention
The present invention is precisely in order to a kind of minor diameter rock mass hydrofracturing test bridging for solving above-mentioned technical problem and designing Formula packer.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of minor diameter rock mass hydrofracturing test straddle packer, including double loop mounting rod connector, a upper packing Device, a connector with hole for water spraying, a lower packet and a lower end cap;Double loop mounting rod connector, upper packer, Connector, lower packet and lower end cap with hole for water spraying are successively closely coupled.
The minor diameter rock mass hydrofracturing tests straddle packer, and the material of double loop mounting rod connector is 304 There is screw thread at stainless steel, both ends, are separately connected double loop mounting rod and upper packer, the packer of double loop mounting rod connector Inlet opening is connected to packer rubber tube channel, and the fracturing section inlet opening connection packer fracturing section of double loop mounting rod connector is logical Road;Respectively there is a circle groove at double loop mounting rod connector both ends, at the mounting rod connector connecting groove of double loop and with packing O-shaped rubber seal is worn at device connecting groove respectively, realizes and is threadedly coupled end face sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, the packer water inlet of double loop mounting rod connector Hole and fracturing section inlet opening, diameter are Φ 6mm.
The minor diameter rock mass hydrofracturing tests straddle packer, and upper packer and lower packet are same model, Its internal structure is identical, is Inflatable type packer rubber sleeve, and Inflatable type packer rubber sleeve has two kinds of models of Φ 31mm and Φ 39mm; Two kinds of packer pressure resistances reach 40MPa, and heatproof reaches 130 DEG C.
The minor diameter rock mass hydrofracturing tests straddle packer, and upper and lower packer includes upper linkage section, expansion Seal section and lower linkage section;Upper and lower packer both ends have connection screw thread, and having inside intermediate expansion seal section enhances its intensity Steel disc.
The minor diameter rock mass hydrofracturing tests straddle packer, and the connector material with hole for water spraying is 304 stainless There is screw thread at steel, connector both ends, and upper and lower two packers are connected;There are two channels in connector, are packer respectively Channel and fracturing section channel;Wherein pass through a Φ 6mm among fracturing section channel, the stainless steel tube of wall thickness 1.5mm, the steel pipe with Lower end cap bottom firmly welds together;There are three the hole for water spraying for being connected to fracturing section channel, packer channels on the connectors The rubber tube of upper packer and lower packet is connected, connector wears O-shaped rubber seal at upper and lower packer connecting groove, It realizes and is threadedly coupled end face sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, and lower end cap material is 304 stainless steels, and front end has Screw thread is connect with lower packet, and rear end increases its frictional force in surface rolling cruciate flower, welds a Φ 6mm, wall in the middle part of lower end cap 304 stainless steel tubes of thick 1.5mm, the stainless steel tube be pressure break channel, stainless steel tube length be 1.18m, the bottom of lower end cap with Stainless steel tube firmly welds together, high pressure resistant and air tight;And O-shaped rubber seal is worn in groove, realizes that screw thread connects Contact surface sealing.
Present invention is mainly used for the slim hole hydrofracturing of rock mass test in, function be in drill one section completely The palisades of rock mass seal, sealing space is formed, to provide the function of high-pressure-resistant sealed in subsequent development hydrofracturing operation Energy.By inventing the straddle packer, a diameter of 30 ± 1mm of Ф, 39 ± 1mm of Φ, and pressure resistance reaches 40MPa, Ke Yishi The live hydrofracturing test of existing rock mass medium-small diameter drilling.
Minor diameter straddle packer carries out minor diameter hydrofracturing Original strata stress test job through the invention, meets The requirement of two kinds of 30 ± 1mm of packer outer dimension Φ, 39 ± 1mm of Φ and pressure resistance 40MPa, while seal approach also meets pressure resistance The requirement of 40MPa.Packer and fracturing section is given to supply water respectively using two inlet openings of double loop mounting rod connector, by upper The hole for water spraying of connector is sealed the hydrofracturing test of section between lower two packers, and at the same time monitoring fracturing section and envelope Every the pressure value of device, be conducive to the stress database for obtaining high quality, realization is surveyed in Φ 38mm and Φ 44mm minor diameter geology Hydrofracturing In-situ stress measurements in prospecting bit hole.
The beneficial effects of the present invention are: the hydrofracturing In-situ stress measurements scheme in slim hole is realized, this Straddle packer has two kinds of specifications of Φ 30mm and Φ 39mm, and structure is simple, and it is convenient to assemble, and is connected by double loop mounting rod This five components of head, upper packer, the connector with hole for water spraying, lower packet and lower end cap realize hydraulic pressure in slim hole The test section of fracturing In-situ stress measurements seals and the injection of highly pressurised liquid.
Detailed description of the invention
Fig. 1 is existing double back path test system hydrofracturing In-situ stress measurements device straddle packer schematic diagram.
Fig. 2 is existing single loop test macro hydrofracturing In-situ stress measurements device straddle packer schematic diagram.
Fig. 3 is straddle packer whole interior structural schematic diagram of the present invention.
Fig. 4 is mounting rod connector mechanical construction drawing in double loop of the present invention.
Fig. 5 is packer mechanical construction drawing of the present invention.
Fig. 6 is the connector mechanical construction drawing of the invention with hole for water spraying.
Fig. 7 is lower end cap mechanical construction drawing of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in fig. 3 to 7, a kind of minor diameter rock mass hydrofracturing of the present invention tests straddle packer, including double loop peace Fill the 4, lower packets 7 of connector of the upper packer 2, one of bar connector 1, one with hole for water spraying 3 and one 8 groups of lower end cap At;Double loop mounting rod connector 1, upper packer 2, the connector 4 with hole for water spraying 3, lower packet 7 and lower end cap 8 are successively tight It is close to be connected.
The minor diameter rock mass hydrofracturing tests straddle packer, and the material of double loop mounting rod connector 1 is 304 There is screw thread at stainless steel, both ends, are separately connected double loop mounting rod and upper packer, the packing of double loop mounting rod connector 1 Device inlet opening 5 is connected to packer rubber tube channel 12, and the fracturing section inlet opening 6 of double loop mounting rod connector 1 is connected to packer Fracturing section channel 13;Respectively there is a circle groove 11 at mounting rod connector 1 both ends in double loop, and in double loop, the connection of mounting rod connector is recessed At slot 11 and with wear O-shaped rubber seal at packer connecting groove 11 respectively, realize and be threadedly coupled end face sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, the packer of double loop mounting rod connector 1 into Water hole 5 and fracturing section inlet opening 6, diameter are Φ 6mm.
The minor diameter rock mass hydrofracturing tests straddle packer, and upper packer 2 and lower packet 7 are same type Number, it is Inflatable type packer rubber sleeve that internal structure is identical, and Inflatable type packer rubber sleeve has two kinds of types of Φ 31mm and Φ 39mm Number;Two kinds of packer pressure resistances reach 40MPa, and heatproof reaches 130 DEG C.
In the measurement process of hydrofracturing Original strata stress, as shown in figure 4, highly pressurised liquid is respectively out of double loop mounting rod Two channels in portion enter fracturing section inlet opening and packer inlet opening, and wherein highly pressurised liquid passes through fracturing section inlet opening and connection The internal pipeline of head enters the fracturing section channel between packer, and another way highly pressurised liquid passes through packer inlet opening and connector Internal pipeline enter the channel inside packer rubber tube, expand the rubber tube in the middle part of packer, reach to hole wall seal Effect.And it is close at the mounting rod connector connecting groove of double loop and with O-shaped rubber is worn respectively at packer connecting groove Seal has the function that be threadedly coupled end face sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, and upper and lower packer 2,7 includes upper linkage section 14, Expansion sealing section 15 and lower linkage section 16;Upper and lower packer 2,7 both ends have connection screw thread 17, intermediate expansion seal section There is the steel disc 18 for enhancing its intensity inside 15.As shown in figure 5, highly pressurised liquid is logical during hydrofracturing In-situ stress measurements It crosses internal pipeline and enters Expansion sealing section and expanded, and be allowed to be bonded with hole wall, test is reached by upper and lower two packers The requirement of section sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, and 4 material of connector with hole for water spraying 3 is not 304 not Become rusty steel, and there is screw thread at connector both ends, upper and lower two packers is connected, as shown in Figure 6;There are two logical in connector 4 Road is packer channel 21 and fracturing section channel 22 respectively;Wherein intermediate fracturing section channel 22 passes through a Φ 6mm, wall thickness The stainless steel tube of 1.5mm, the steel pipe firmly weld together with 8 bottom of lower end cap;There are three be connected to pressure break on connector 4 The hole for water spraying 3 of Duan Tongdao 22, the outside injection for highly pressurised liquid during hydrofracturing.It is sealed in the connection of packer channel 21 Drilling hole is realized for expansion of the highly pressurised liquid to rubber tube during hydrofracturing every the rubber tube of device and lower packet The sealing of wall fracturing section.Connector 4 wears O-shaped rubber seal at upper and lower packer connecting groove 20, realizes threaded ends Face sealing.
The minor diameter rock mass hydrofracturing tests straddle packer, and 8 material of lower end cap is 304 stainless steels, front end There is screw thread to connect with lower packet, rear end increases its frictional force in surface rolling cruciate flower, a Φ 6mm is welded in the middle part of lower end cap 8, 304 stainless steel tubes of wall thickness 1.5mm, the stainless steel tube are pressure break channel 24, and stainless steel tube length is 1.18m, the bottom of lower end cap Portion firmly welds together with stainless steel tube, high pressure resistant and air tight;And O-shaped rubber seal is worn in groove 23, is realized It is threadedly coupled end face sealing.
The in vitro Original strata stress test simulation environment of this set equipment is tested, and application effect is good, experiment Process is described in detail as follows:
(1) be Ф 34mm using internal diameter, the steel pipe of Ф 44mm simulates live slim hole, by high-pressure oil pump, high-pressure fluid control System processed, double loop mounting rod, minor diameter straddle packer connect.
(2) oil pump outlet valve is opened, fracturing section ball valve and pressure relief ball valve are closed, pressurizes to packer, examines setting function, Packer monitors pressure gauge and shows packer pressure resistance 40MPa, and setting ability is good.
(3) oil pump outlet valve is opened, packer needle-valve and pressure relief ball valve are closed, is pressurizeed to fracturing section, pressure break function is examined, Fracturing section monitors pressure gauge and shows fracturing section pressure resistance 40MPa, packer pressure 50MPa, and high-pressure fluid pressure break fan-out capability is good.
(4) in test process, each connector leakproofness is good, does not have evaporating, emitting, dripping or leaking of liquid or gas phenomenon, and pressure maintains stability good It is good.
(5) oil pump oil return valve is opened, delivery valve is closed, opens packer needle-valve, fracturing section ball valve, pressure relief ball valve, is completed Blowout job.
The present invention is not limited to above-mentioned preferred forms, anyone obtain under the inspiration of the present invention other it is any with The identical or similar product of the present invention, is within the scope of the present invention.

Claims (7)

1. a kind of minor diameter rock mass hydrofracturing tests straddle packer, including double loop mounting rod connector (1), on one Packer (2), a connector (4) with hole for water spraying (3), a lower packet (7) and a lower end cap (8);Its feature exists In: double loop mounting rod connector (1), upper packer (2), the connector (4) with hole for water spraying (3), lower packet (7) and lower stifled Head (8) is successively closely coupled.
2. minor diameter rock mass hydrofracturing according to claim 1 tests straddle packer, it is characterised in that: double loop The material of mounting rod connector (1) is 304 stainless steels, and there is screw thread at both ends, is separately connected double loop mounting rod and upper packer, The packer inlet opening (5) of double loop mounting rod connector (1) is connected to packer rubber tube channel (12), and double loop mounting rod connects The fracturing section inlet opening (6) of connector (1) is connected to packer fracturing section channel (13);Double loop mounting rod connector (1) both ends are each There is a circle groove (11), distinguishes at double loop mounting rod connector connecting groove (11) and at packer connecting groove (11) O-shaped rubber seal is worn, realizes and is threadedly coupled end face sealing.
3. minor diameter rock mass hydrofracturing according to claim 2 tests straddle packer, it is characterised in that: double loop The packer inlet opening (5) and fracturing section inlet opening (6) of mounting rod connector (1), diameter is Φ 6mm.
4. minor diameter rock mass hydrofracturing according to claim 1 tests straddle packer, it is characterised in that: upper packing Device (2) and lower packet (7) are same model, and identical internal structure is Inflatable type packer rubber sleeve, inflatable packer Packing element has two kinds of models of Φ 31mm and Φ 39mm;Two kinds of packer pressure resistances reach 40MPa, and heatproof reaches 130 DEG C.
5. testing straddle packer with minor diameter rock mass hydrofracturing described in 4 according to claim 1, it is characterised in that: upper, Lower packet (2,7) includes upper linkage section (14), Expansion sealing section (15) and lower linkage section (16);Upper and lower packer (2,7) Both ends have connection screw thread (17), there is the steel disc (18) for enhancing its intensity inside intermediate expansion seal section (15).
6. minor diameter rock mass hydrofracturing according to claim 1 tests straddle packer, it is characterised in that: band water spray Connector (4) material in hole (3) is 304 stainless steels, and there is screw thread at connector both ends, upper and lower two packers are connected;Even Channel there are two connecing in device (4), is packer channel (21) and fracturing section channel (22) respectively;Wherein intermediate fracturing section channel (22) a Φ 6mm, the stainless steel tube of wall thickness 1.5mm are passed through, which firmly welds together with lower end cap (8) bottom;? There are three being connected to the hole for water sprayings (3) of fracturing section channel (22) on connector (4), packer channel (21) connect upper packer and The rubber tube of lower packet, connector (4) wear O-shaped rubber seal at upper and lower packer connecting groove (20), realize screw thread Connecting end surface sealing.
7. testing straddle packer with minor diameter rock mass hydrofracturing described in 6 according to claim 1, it is characterised in that: under Plug (8) material is 304 stainless steels, and front end has screw thread to connect with lower packet, and rear end increases it in surface rolling cruciate flower and rubs Power is wiped, a Φ 6mm, 304 stainless steel tubes of wall thickness 1.5mm are welded in the middle part of lower end cap (8), which is pressure break channel (24), stainless steel tube length is 1.18m, and the bottom of lower end cap firmly welds together with stainless steel tube, high pressure resistant and air tight; And O-shaped rubber seal is worn in groove (23), realizes and is threadedly coupled end face sealing.
CN201810905691.8A 2018-08-10 2018-08-10 Minor diameter rock mass hydrofracturing tests straddle packer Pending CN108999586A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110017132A (en) * 2019-05-24 2019-07-16 中国地质科学院地质力学研究所 A kind of hydraulic fracturing packer and fracturing section pressure monitoring device
CN111502589A (en) * 2020-04-23 2020-08-07 中国地质科学院地质力学研究所 Packer for measuring ground stress by hydraulic fracturing method
CN111677497A (en) * 2020-06-28 2020-09-18 中国地质科学院地质力学研究所 Hydrofracturing stress detection device and detecting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110017132A (en) * 2019-05-24 2019-07-16 中国地质科学院地质力学研究所 A kind of hydraulic fracturing packer and fracturing section pressure monitoring device
CN111502589A (en) * 2020-04-23 2020-08-07 中国地质科学院地质力学研究所 Packer for measuring ground stress by hydraulic fracturing method
CN111677497A (en) * 2020-06-28 2020-09-18 中国地质科学院地质力学研究所 Hydrofracturing stress detection device and detecting system

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