CN103900751A - Two-circuit hydraulic fracturing geostress measurement device and method based on wire-line coring drill rod - Google Patents
Two-circuit hydraulic fracturing geostress measurement device and method based on wire-line coring drill rod Download PDFInfo
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- CN103900751A CN103900751A CN201310613396.2A CN201310613396A CN103900751A CN 103900751 A CN103900751 A CN 103900751A CN 201310613396 A CN201310613396 A CN 201310613396A CN 103900751 A CN103900751 A CN 103900751A
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Abstract
The invention discloses a two-circuit hydraulic fracturing geostress measurement device and method based on a wire-line coring drill rod. According to the two-circuit hydraulic fracturing geostress measurement device and method based on the wire-line coring drill rod, a packer is installed at the bottom end of the wire-line coring drill rod and located in a drill hole, the wire-line coring drill rod is fixed to a drill hole mouth through a drill rod clamping base, the bottom end of the wire-line coring drill rod is connected with a variable connector in a threaded mode, and an upper packer is connected to the variable connector; a high-pressure hose is connected into a high-pressure inlet outside the drill hole and penetrates into a pipe clamp and a clamping ring which are arranged inside a purpose-made drill rod connector, the high-pressure hose is supported in the wire-line coring drill rod in a suspended mode through the purpose-made drill rod connector and the clamping tools, and on the bottom, the drill rod is connected with the variable connector, and a thin high-pressure hose is connected to the packer and a thick high-pressure hose is communicated with a packer center rod and the hole wall of a fracture section after the high-pressure hose is connected with the variable connector; the upper end of the high-pressure hose is connected with a high-pressure pump on the ground, the high-pressure pump can pressurize the packer and a testing section inside the packer, a test is conducted, and test data are obtained.
Description
Technical field
The invention belongs to rock mechanics technical field, relate to hydraulic fracturing terrestrial stress measuring technology, carry out the technology of hydraulic fracturing terrestrial stress test by borehole wire-line coring drilling rod, specifically relate to a kind of borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress proving installation and method.
Background technology
Terrestrial stress is the basic acting force that causes that tunnel surrounding and Support Deformation destroy, carrying out before large moldeed depth Tunnel Engineering builds, in order to ensure engineering safety, the research of stress state is necessary over the ground, particularly in heavily stressed area, Tunnel during Construction rock excavation can cause a series of and terrestrial stress discharge relevant distortion with at breakoff phenomenon, terrestrial stress test is the important content that carries out tunnel rock burst and the forecast of other hazard predictions.
Hydraulic fracturing is the main method for measurement that the mensuration rock stress of ISRM's promulgation is recommended, hydraulic fracturing is the advanced method that can directly carry out preferably in the world deep hole stress measurement at present, and hydraulic fracturing is widely used in the every field of the industry rock engineerings such as water conservancy and hydropower, traffic, mine and geodynamics research.
Hydraulic fracturing terrestrial stress test philosophy is to utilize a pair of expandable rubber packer, at one section of boring rock mass of predetermined MTD packing, then pumping liquid is exerted pressure to this section of boring, until producing, rock breaks, according to the pressure characteristic value of fracturing process curve and pressure-break direction, stress level, direction and the Changing Pattern along the degree of depth thereof definitely.
Tradition hydraulic fracturing terrestrial stress measuring technology can be divided into single loop method and two-circuit method.Wherein, it is pressure channel that single loop method adopts drilling rod, only carries out pressure channel switching in bottom, and borehole wall rock is carried out to pressure break, requires drilling rod to bear elevated pressures.Two-circuit method adopts two pipelines, and one is high-pressure hose, to the pressurization of packing capsule and the monitoring in sealing drilling rock interval; It two is drilling rod, rock between bore area is carried out to pressure break, thereby obtain Characteristic pressures and determine rock mass stress vector, two-circuit method is fixed on high-pressure hose outside drilling rod, above two kinds of methods all need using drilling rod as high-pressure channel, need, by whole drilling rod joint screw thread sealings, form high-pressure channel, not be suitable for the drilling rod of thin-walled, otherwise, drilling rod easily produces pressure break, and terrestrial stress equipment and capstan, is subject to compression swelling distortion and slippage.Before test, need drill pipe sub to dismantle and sealing, and drill pipe sub dismounting difficulty, waste time and energy.Generally speaking, rig rod boring used, and test with this drilling rod, change drilling rod as need, need larger expense.
At present, the gun drilling that terrestrial stress MTD is greater than 500 meters, mostly adopt borehole wire-line coring drilling rod to carry out pore-creating, in view of borehole wire-line coring drilling rod thinner, test and all need using drilling rod as high-pressure channel with existing hydraulic fracturing terrestrial stress, under the high pressure that terrestrial stress test needs, borehole wire-line coring drilling rod is exerted pressure and easily produced pressure break, darker because holing, joint between every 3 meters of drilling rods is thread connection, the thread connection position of drilling rod, because dilatational strain is easy to slippage, easily cause drilling rod and terrestrial stress testing equipment to lose, this is the biggest problem that generally can not directly test terrestrial stress in gun drilling.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress proving installation is provided, by special drill pipe sub and jig, provide high-pressure hose in borehole wire-line coring drilling rod inner suspension support, and connect and become joint by borehole wire-line coring drilling rod bottom, make two high-pressure hoses in borehole wire-line coring drilling rod be connected respectively to test section between packer and packer, realize two-circuit method applied voltage test.
Another object of the present invention is to provide a kind of wire line coring boring two-circuit hydraulic fracturing terrestrial stress method of testing, borehole wire-line coring drilling rod bottom is provided with packer and is arranged in boring, be connected with ground high-pressure pump by two high-pressure hoses of inserting borehole wire-line coring drilling rod inside, high-pressure pump is test section pressurization between packer and packer up and down respectively, change and store and the break length and direction record the record that stitch by obtaining process of the test pressure, thereby obtaining test findings.
The present invention solves its technical matters by the following technical solutions: a kind of borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress proving installation, mainly in borehole wire-line coring drilling rod bottom, packer be installed and be arranged in boring, when test, by drilling rod deck, borehole wire-line coring drilling rod is fixed in boring, described borehole wire-line coring drilling rod bottom thread connection becomes joint, and upper packer is connected in and becomes on joint;
Between described borehole wire-line coring drilling rod, connect with special drill pipe sub, in special drill pipe sub, be provided with snap ring and pipe clamp;
High pressure entry outside boring accesses respectively thin high-pressure hose, thick high-pressure hose, and thin high-pressure hose, thick high-pressure hose are connected to respectively pressure transducer 3, and described thin high-pressure hose, thick high-pressure hose penetrate respectively the pipe clamp arranging in drilling rod, and be placed on snap ring;
Thin high-pressure hose in described drilling rod, thick high-pressure hose are by becoming joint, and thin high-pressure hose is by flexible pipe and be connected to packer, fracturing section between high-pressure hose UNICOM upper packer center-pole and packer.
And, described packer packer center-pole two ends respectively with upper packer and lower packet thread connection, upper packer and lower packet are respectively two expandable rubber packers, set on borehole wall.
And, described pressure transducer access data Acquisition Instrument, and access access computing machine.
On described thin high-pressure hose, thick high-pressure hose, be connected to respectively tensimeter.
Between described thin high-pressure hose, all adopt and be threaded between thick high-pressure hose.
A kind of borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress method of testing, its operation steps is as follows:
1) equipment is installed: in aperture, in pipe clamp and the special drill pipe sub of snap ring, pipe clamp is locked the thickness high-pressure hose mating with run of steel and is put into borehole wire-line coring drilling rod, special tool joint thread connects borehole wire-line coring drilling rod, to become joint connects with packer, borehole wire-line coring drilling rod bottom thread connection becomes joint, connect respectively thickness high-pressure hose, borehole wire-line coring drilling rod, the borehole wire-line coring drilling rod that is connected with thickness high-pressure hose is transferred in lifting, packer is put into selected hole depth, ground is connected to the thin high-pressure hose of hydraulic pump, thick high-pressure hose penetrates borehole wire-line coring drilling rod, the thin high-pressure hose in bottom, thick high-pressure hose accesses respectively change joint, thin high-pressure hose is connected to packer, fracturing section hole wall between thick high-pressure hose UNICOM's packer center-pole UNICOM's packer,
2) set pressurization: hydraulic pump makes it expand, set in hole wall from high pressure entry to thin high-pressure hose water filling pressurization, forms pressure-bearing section space, to thick high-pressure hose water filling pressurization, pressure-bearing section pressurized;
3) crag breaks: under enough large hydraulic action, hole wall occurs breaking along a line of least resistance, and this breaks and will on perpendicular to cross section, in least principal stress plane, extend, correspondingly, when pump pressure rises to threshold burst pressure value, rock mass parting pressure value sharply declines;
4) close pump release: closing presure pump, fracturing liquid penetrates into rock stratum, thick high-pressure hose channel inner pressure slow decreasing, when pressure drops to the pressure while making crack in critical closure state, the pressure while reaching balance perpendicular to the least principal stress of fracture plane and hydraulic circuit, open pressure valve release, make crack completely closed, this process is by pressure transducer, Acquisition Instrument and computer-automatic collection data storage.
Operation steps also comprises;
1) deblocking of re-opening: by claimed in claim 6 1)～3) step carries out repeatedly pressurized circulation continuously, obtain repeatedly fracturing parameter, judge the process of rock burst and fracture propagation, after pressure break, remove thick high-pressure hose pressure, make liquid in packer reflux by thin high-pressure hose and reduce pressure, removing seal for packer:
2) the seam record that breaks: after said process completes, by connecting die device, drilling rod and single high-pressure hose and putting to selected depth in hole, by the break form of seam of die device and orienting device record thereof, can obtain stress direction.
The present invention compared with prior art also has following major advantage:
1, the present invention adopts borehole wire-line coring drilling rod bottom to be connected with packer and is arranged in boring, borehole wire-line coring drilling rod bottom thread connection becomes joint, packer is connected in and becomes on joint, borehole wire-line coring drilling rod only play fixed supporting role to terrestrial stress packer and high-pressure hose pipeline, borehole wire-line coring drilling rod does not bear high pressure, avoid the thinner pressurized pressure break of borehole wire-line coring drilling rod wall slippage risk, ensured drilling tool and the testing equipment safety in high-potting.
2, the present invention is by the built-in two-circuit of borehole wire-line coring drilling rod hydraulic fracturing terrestrial stress proving installation, be applicable to the large boring that fathoms, between two borehole wire-line coring drilling rods, there is special drill pipe sub to connect, two high-pressure hoses are locked by the snap ring pipe clamp in drilling rod special fit respectively, by special drill pipe sub and jig, the suspension of high-pressure hose in borehole wire-line coring drilling rod inside is provided, borehole wire-line coring drilling rod is owing to not being stressed, borehole wire-line coring drilling rod wall compared with thin pressurized dilatational strain and slippage, avoids causing drilling rod and terrestrial stress testing equipment to lose.
3, the present invention adopts and utilizes the protection of borehole wire-line coring drilling rod to hole wall, can realize the terrestrial stress test of passing through understable soft stratum boring, has expanded the scope of application of hydraulic fracturing terrestrial stress test.
4, two-circuit of the present invention hydraulic fracturing terrestrial stress proving installation adopts borehole wire-line coring drilling rod bottom thread connection to become joint, packer thread is connected in and becomes on joint, high-pressure hose connects employing and is threaded or rapid-acting coupling, high-pressure hose and change joint sealing thread connection, drill pipe sub dismounting and sealing time are saved, simple to operate, test period is short, can shorten man-hour and test nearly 20-40% of duration.
5, the present invention adopts borehole wire-line coring drilling rod bottom to connect terrestrial stress equipment, be that borehole wire-line coring drilling rod bottom is provided with packer and is arranged in boring, two high-pressure hose lower ends in drilling rod connect with change joint screw thread, and be connected to respectively fracturing section between packer capsule and packer, article two, high-pressure hose upper end is connected with ground high-pressure pump, high-pressure pump can pressurize to test section between packer and packer respectively, thereby packer inflation is set after hole wall, realizes two-circuit method applied voltage test.
6, the present invention is owing to adopting borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress method of testing, a measuring point carries out repeatedly pressurized circulation continuously, in process, by pressure transducer, high-pressure hose pressure signal feedback computer system is also processed, calculated terrestrial stress value thereby can obtain fracturing parameter.Remove aperture place high-pressure hose pressure, removing seal for packer, continuation connection drilling rod and high-pressure hose can be proceeded the terrestrial stress value test of next selected hole depth.By connecting die device, drilling rod and single high-pressure hose and putting to selected depth in hole, by the break form of seam of die device and orienting device record thereof, can obtain stress direction.
Brief description of the drawings
Fig. 1 borehole wire-line coring drilling rod of the present invention two-circuit hydraulic fracturing terrestrial stress proving installation structural representation.
Fig. 2 borehole wire-line coring drilling rod of the present invention two-circuit hydraulic fracturing terrestrial stress proving installation flexible pipe, change joint, packer connect schematic diagram.
Fig. 3 borehole wire-line coring drilling rod of the present invention two-circuit hydraulic fracturing terrestrial stress proving installation pipe clamp structure schematic diagram.
Fig. 4 borehole wire-line coring drilling rod of the present invention two-circuit hydraulic fracturing terrestrial stress proving installation pipe clamp structure schematic diagram.
Computing machine 1, Acquisition Instrument 2, pressure transducer 3, tensimeter 4, pipe clamp 5, snap ring 6, borehole wire-line coring drilling rod 7, thin high-pressure hose 8, thick high-pressure hose 9, change joint 10, connecting hose 11, upper packer 12, fracturing section connecting hose 13, lower packet 14, terrestrial stress boring 15, hanging basket 16, rig and elevator 17, mushroom head 18, drilling rod deck 19, special drill pipe sub 20, upper packer center-pole 21, high pressure entry 22, packer 23.
embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
See Fig. 1,2,3,4, borehole wire-line coring drilling rod of the present invention two-circuit hydraulic fracturing terrestrial stress proving installation, borehole wire-line coring drilling rod 7 bottom thread connection become joint 10, upper packer 12 thread connection are becoming on joint 10, borehole wire-line coring drilling rod 7 connects with special drill pipe sub 20, in special drill pipe sub 20, be provided with snap ring 6 and pipe clamp 5, borehole wire-line coring drilling rod 7 bottoms are provided with packer B and are placed in boring 15, by drilling rod deck 19 and mushroom head 18, borehole wire-line coring drilling rod 7 are fixed on to 15 mouthfuls of borings.
Hydraulic pump outside boring 15 accesses thin high-pressure hose 8, thick high-pressure hose 9 from high pressure entry 22, and thin high-pressure hose 8, thick high-pressure hose 9 are connected to respectively pressure transducer 3, pressure transducer 3 access data Acquisition Instruments 2, and access access computing machine 1.
Special drill pipe sub 20 is connected on drilling rod, thin high-pressure hose 8, thick high-pressure hose 9 penetrates respectively the pipe clamp 5 of special drill pipe sub 20 interior settings, and be fixed on snap ring 6, thin high-pressure hose 8, thick high-pressure hose 9 self connects and all adopts screw thread or rapid-acting coupling to connect, thin high-pressure hose 8 in drilling rod 7, thick high-pressure hose 9 is by becoming joint 10, and then thin high-pressure hose 8 is connected to packer 23 by flexible pipe 11 and 13, fracturing section between thick high-pressure hose 9 UNICOM's upper packer center-poles 21 and packer 23, packer be upper packer center-pole 22 two ends respectively with upper packer 12 and lower packet 14 thread connection, upper packer 12 and lower packet 14 are respectively two expandable rubber packers, set on boring 15 hole walls.
Borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress testing procedure.Drilling rod is put into before boring, special drill pipe sub is locked to the thickness flexible pipe mating with run of steel together with pipe clamp and snap ring and put into drilling rod.
When equipment is put into hole, first by change joint and packer connects and first put into aperture, borehole wire-line coring drilling rod bottom thread connection becomes joint, lift by crane the ready drilling rod of next root, connect high-pressure hose and drilling rod in aperture, the borehole wire-line coring drilling rod and the flexible pipe that connect are transferred in lifting, by above-mentioned steps, packer are put into selected hole depth.Forming upper packer center-pole is connected on change joint, ground is connected to the thin high-pressure hose of hydraulic pump, thick high-pressure hose penetrates borehole wire-line coring drilling rod, in special drill pipe sub, be provided with snap ring and pipe clamp is locked, in bottom, thin high-pressure hose, thick high-pressure hose access respectively change joint, last thin high-pressure hose is connected to packer, fracturing section hole wall between thick high-pressure hose UNICOM's upper packer center-pole final UNICOM packer.
Hydraulic pump makes it expand, set in hole wall from high pressure entry to thin high-pressure hose water filling pressurization, forms pressure-bearing section space, to thick high-pressure hose water filling pressurization, pressure-bearing section pressurized; Under enough large hydraulic action, hole wall occurs breaking along a line of least resistance, and this breaks and will on perpendicular to cross section, in least principal stress plane, extend, and correspondingly, when pump pressure rises to threshold burst pressure value, rock mass parting pressure value sharply declines.Closing presure pump, fracturing liquid penetrates into rock stratum, thick high-pressure hose channel inner pressure slow decreasing, when pressure drops to the pressure while making crack in critical closure state, the pressure while reaching balance perpendicular to the least principal stress of fracture plane and hydraulic circuit, open pressure valve release, make crack completely closed.This process is by pressure transducer, Acquisition Instrument and computer-automatic collection data storage.Carry out continuously repeatedly pressurized circulation by above-mentioned steps, obtain repeatedly fracturing parameter, judge the process of rock burst and fracture propagation, after pressure break, remove thin and tall pressure hose pressure, make liquid in packer reflux by thin high-pressure hose and reduce pressure, removing seal for packer.
Continue connection drilling rod and high-pressure hose and can proceed the terrestrial stress value test of next selected hole depth.By connecting die device, drilling rod and single high-pressure hose and putting to selected depth in hole, by the break form of seam of die device and orienting device record thereof, can obtain stress direction.
Claims (7)
1. a borehole wire-line coring drilling rod two-circuit hydraulic fracturing terrestrial stress proving installation, it is characterized in that: borehole wire-line coring drilling rod 7 bottoms are provided with packer 23 and are arranged in boring 15, when test, by drilling rod deck 19, borehole wire-line coring drilling rod 7 is fixed in boring 15, described borehole wire-line coring drilling rod 7 bottom thread connection become joint 10, and upper packer 12 is connected in and becomes on joint 10;
Between described borehole wire-line coring drilling rod 7, connect with special drill pipe sub 20, in special drill pipe sub 20, be provided with snap ring 6 and pipe clamp 5;
High pressure entry 22 outside boring 15 accesses respectively thin high-pressure hose 8, thick high-pressure hose 9, thin high-pressure hose 8, thick high-pressure hose 9 are connected to respectively pressure transducer 3, described thin high-pressure hose 8, thick high-pressure hose 9 penetrate respectively the pipe clamp 5 of drilling rod 7 interior settings, and are placed on snap ring 6;
Thin high-pressure hose 8 in described drilling rod 7, thick high-pressure hose 9 are by becoming joint 10, and thin high-pressure hose 8 is connected to packer 23 by flexible pipe 11 and 13, fracturing section between high-pressure hose 9 UNICOM's upper packer center-poles 21 and packer 23.
2. a kind of borehole wire-line coring drilling rod according to claim 1 two-circuit hydraulic fracturing terrestrial stress proving installation, it is characterized in that: described packer 23 for packer center-pole 22 two ends respectively with upper packer 12 and lower packet 14 thread connection, upper packer 12 and lower packet 14 are respectively two expandable rubber packers, set on boring 15 hole walls.
3. a kind of borehole wire-line coring drilling rod according to claim 1 two-circuit hydraulic fracturing terrestrial stress proving installation, is characterized in that: described pressure transducer 3 access data Acquisition Instruments 2, and access access computing machine 1.
4. a kind of borehole wire-line coring drilling rod according to claim 1 two-circuit hydraulic fracturing terrestrial stress proving installation, is characterized in that: on described thin high-pressure hose 8, thick high-pressure hose 9, be connected to respectively tensimeter 4.
5. a kind of borehole wire-line coring drilling rod according to claim 1 two-circuit hydraulic fracturing terrestrial stress proving installation, is characterized in that: between described thin high-pressure hose 8, all adopt thread connection between thick high-pressure hose 9.
6. a kind of borehole wire-line coring drilling rod according to claim 1 two-circuit hydraulic fracturing terrestrial stress method of testing, is characterized in that: its operation steps is as follows:
1) equipment is installed: in aperture, in pipe clamp and the special drill pipe sub of snap ring, pipe clamp is locked the thickness high-pressure hose mating with run of steel and is put into borehole wire-line coring drilling rod, special tool joint thread connects borehole wire-line coring drilling rod, to become joint connects with packer, borehole wire-line coring drilling rod bottom thread connection becomes joint, connect respectively thickness high-pressure hose, borehole wire-line coring drilling rod, the borehole wire-line coring drilling rod that is connected with thickness high-pressure hose is transferred in lifting, packer is put into selected hole depth, ground is connected to the thin high-pressure hose of hydraulic pump, thick high-pressure hose penetrates borehole wire-line coring drilling rod, the thin high-pressure hose in bottom, thick high-pressure hose accesses respectively change joint, thin high-pressure hose is connected to packer, fracturing section hole wall between thick high-pressure hose UNICOM's packer center-pole UNICOM's packer:
2) set pressurization: hydraulic pump makes it expand, set in hole wall from high pressure entry to thin high-pressure hose water filling pressurization, forms pressure-bearing section space, to thick high-pressure hose water filling pressurization, pressure-bearing section pressurized;
3) crag breaks: under enough large hydraulic action, hole wall occurs breaking along a line of least resistance, and this breaks and will on perpendicular to cross section, in least principal stress plane, extend, correspondingly, when pump pressure rises to threshold burst pressure value, rock mass parting pressure value sharply declines;
4) close pump release: closing presure pump, fracturing liquid penetrates into rock stratum, thick high-pressure hose channel inner pressure slow decreasing, when pressure drops to the pressure while making crack in critical closure state, the pressure while reaching balance perpendicular to the least principal stress of fracture plane and hydraulic circuit, open pressure valve release, make crack completely closed, this process is by pressure transducer, Acquisition Instrument and computer-automatic collection data storage.
7. a kind of borehole wire-line coring drilling rod according to claim 6 two-circuit hydraulic fracturing terrestrial stress method of testing, is characterized in that: its operation steps also comprises:
1) deblocking of re-opening: by claimed in claim 6 1)～3) step carries out repeatedly pressurized circulation continuously, obtain repeatedly fracturing parameter, judge the process of rock burst and fracture propagation, after pressure break, remove thick high-pressure hose pressure, make liquid in packer reflux by thin high-pressure hose and reduce pressure, removing seal for packer;
2) the seam record that breaks: after said process completes, by connecting die device, drilling rod and single high-pressure hose and putting to selected depth in hole, by the break form of seam of die device and orienting device record thereof, can obtain stress direction.
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