AU2019201471B2 - High-pressure self-locking packer and setting method thereof - Google Patents
High-pressure self-locking packer and setting method thereof Download PDFInfo
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- AU2019201471B2 AU2019201471B2 AU2019201471A AU2019201471A AU2019201471B2 AU 2019201471 B2 AU2019201471 B2 AU 2019201471B2 AU 2019201471 A AU2019201471 A AU 2019201471A AU 2019201471 A AU2019201471 A AU 2019201471A AU 2019201471 B2 AU2019201471 B2 AU 2019201471B2
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- 238000000034 method Methods 0.000 title claims description 13
- 238000003825 pressing Methods 0.000 claims abstract description 53
- 239000012530 fluid Substances 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000011435 rock Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 18
- 238000011065 in-situ storage Methods 0.000 abstract description 11
- 239000007789 gas Substances 0.000 description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 9
- 239000011707 mineral Substances 0.000 description 9
- 238000011161 development Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
of Description
The invention discloses a high-pressure self-locking packer. The high-pressure self-locking
packer comprises a packer plug, a first central pipe, a packer body, a second central pipe and an
upper pressing cap which are connected sequentially, wherein a plurality of one-way valve blocks
5 which communicate the inner cavity of the packer body with the outer part of the packer body are
arranged on the packer body; a first rubber barrel group, a first pressing block and a first piston
sleeve the outer wall of the first central pipe; and a second rubber barrel group, a second pressing
block and a second piston sleeve the outer wall of the second central pipe. According to the
high-pressure self-locking packer, high-pressure sealing parts can be generated by high-pressure
0 fluid without setting at wellhead and sealing of the high-pressure fluid can be realized by the
high-pressure sealing parts, wherein the maximum sealing pressure can reach 150MPa; in-situ
2eostress test and in-situ fracturing test can be performed in boreholes of any angles; reusing for
many times can be realized without other consumables; unlocking and pulling out can be easy to
perform without the hazard of clamping the hole to damage the packer; and the high-pressure
5 self-locking packer can maintain a balanced state in the borehole without other measures so as to
realize the self-locking function.
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Description
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High-pressure Self-locking Packer and Setting Method Thereof
Technical Field The invention belongs to the fields of rock engineering and mining engineering of natural gas,
petroleum and mineral products, and particularly relates to a high-pressure self-locking packer and a
setting method thereof.
Background Art Any discussion of the prior art throughout the specification should in no way be considered as
an admission that such prior art is widely known or forms part of common general knowledge in the
field.
Along with the increasing consumption of conventional oil and gas reservoir and mineral
resources, exploitation and development of unconventional oil and gas reservoir and deep mineral
resources, such as deep-buried oil and gas reservoir, coalbed methane, and shale gas, become
increasingly important and urgent. The large burial depth of deep oil and gas reservoir stratums
results in the characteristics of compactness and low permeability of the reservoir stratums,
commercialized output by exploitation depending on reservoir stratum pressure is difficult to
realize, and measures of fracturing stimulation need to be taken. Deep oil and gas reservoirs have
mostly experienced fierce geology movements, and the reservoir stratums bear higher geostress,
resulting in the corresponding increase in the bursting pressure for fracturing. Conventional packers
which can usually withstand the pressure of 70MPa are difficult to bear the bursting pressure of the
rocks in deep buried reservoir stratums, and therefore ultrahigh-pressure packers need to be
developed for exploitation of unconventional oil and gas reservoirs. At present, the commonly-used
fracturing method is hydraulic fracturing production increment, hydraulic fracturing consumes high
cost and pollutes water resources, besides, most of China's unconventional oil and gas reservoirs are
located in mountainous areas and arid and water-deficient areas, and therefore providing water
resources required by hydraulic fracturing is difficult to realize. The hydraulic fracturing has low
efficiency, and repeated fracturing for several times need to be performed to achieve the effect of
production increment. Gas fracturing is an emerging and efficient manner of green fracturing, and
the application of gas fracturing in deep-buried unconventional energy sources requires better
sealing performance of the packer, and also requires higher pressure resistance of the packer.
Because human rock engineering, such as mineral development, water conservancy and hydropower and underground powerhouses, are continuously performed towards deep stratums, the deep rock engineering faces increasingly serious safety challenges. Along with the increment of development depth of mineral resources, high stress is increasingly-harmful to development of mineral resources. In order to ensure the safety of rock engineering, pressure relief of rock masses needs to be performed. Pressure relief by drilling is a common pressure relief method, but pressure relief by drilling has a poor pressure relief effect due to small influence range caused by smaller diameter of the borehole. Elastic energy in surrounding rocks can be effectively released by packing the borehole by using a packer in the borehole and fracturing complex cracks by high-pressure fluid, so that the effect of pressure relief is increased, and safe exploitation of mineral resources is guaranteed. Deep buried mineral resources usually bear higher stress of primary rocks and induced stress, which leads to the corresponding increment in the fracture pressure of pressure relief by drilling. Therefore, the packer required for pressure relief by drilling for deep buried mine resources also requires high-pressure resistance degree. The high geostress of deep buried stratum is one of the key factors affecting the safety of deep rock engineering. How to test and obtain the high geostress of deep stratum restricts the reasonable design of a construction scheme for rock engineering. Hydraulic fracturing is one of the most economical and practical methods for testing geostress. Hydraulic fracturing needs to pack the stratum of which the geostress needs to be tested using a packer, and then water is injected into the stratum and gradually pressurized to a high-pressure state to enable the stratum to be fractured, so
that geostress parameters of the stratum can be obtained by calculation. A conventional packer has
low-pressure resistance which is normally 70MPa, most of the fracture pressure of hard rocks is
greater than 1OOMPa under the action of the high geostress of deep buried stratums, and the packer
firstly fractures before the rock is fractured, so that the true geostress of the deep stratums is
difficult to test.
Development of deep buried unconventional oil and gas reservoirs, especially the development
of shale gas, is still at the exploration stage and does not enter the stage of substantial commercial
development. The basic research on the fracturing technology is an important guarantee for
promoting the development of unconventional oil and gas. The basic research on the fracturing
technology mainly comprises two methods of theoretical research and experimental research. At present, the experimental studies on fracturing are mostly performed under indoor test conditions, rock samples for indoor tests are smaller in size and mostly in cm level, the actual stress state on site is difficult to restore, and the heterogeneity and anisotropy of the actual reservoir are difficult to reflect. The in-situ fracturing test based on deep buried underground rock mechanical laboratories can well reflect actual stress and geological conditions of the reservoir stratums, which is more favorable to research and promotion of fracturing technology, but few in-situ fracturing tests exist due to the restriction of technical conditions. In-situ fracturing needs to be performed by using a packer, the conventional packer mostly requires mechanical force of the wellhead to set the packer, if the in-situ fracturing tests in deep buried underground rock mechanical laboratories need to design the fracturing borehole according to the direction of geostress, and if the fracturing boreholes are horizontal holes, setting with the wellhead is difficult to realize; in addition, in the in-situ fracturing test, the test rock masses bear greater ground stress and higher fracture pressure when being located in the stress field of primary rocks; and in summary, the in-situ fracturing test requires the packer to withstand higher pressure and have the self-sealing capability at the same time. The requirements of the in-situ fracturing test are difficult to meet by conventional packers.
Summary of the Invention It is an object of the present invention to overcome or ameliorate at least one of the
disadvantages of the prior art, or to provide a useful alternative.
In one embodiment, the invention provides a high-pressure self-locking packer and a setting
method thereof.
According to the invention, there is a high-pressure self-locking packer comprising
a packer plug, a first central pipe, a packer body, a second central pipe and an upper pressing
cap which are connected sequentially,
wherein the packer plug is provided with a packer plug connecting part which fixedly sleeves
the outer wall of the first central pipe;
the first central pipe is provided with an inner cavity of the first central pipe;
the packer body is provided with an inner cavity of the packer body, a plurality of one-way
valve blocks enabling the inner cavity of the packer body and the outer part of the packer body to be
in communication are arranged on the packer body, and two ends of the inner cavity of the packer
body are fixedly connected to the outer wall of the first central pipe and the outer wall of the second central pipe in a sleeving manner; the second central pipe is provided with an inner cavity of the second central pipe; the Tupper pressing cap is provided with an upper pressing cap connecting part which fixedly sleeves the outer wall of the second central pipe, and a high-pressure connector is arranged on the upper pressing cap; the high-pressure connector, the inner cavity of the second central pipe, the inner cavity of the packer body and the inner cavity of the first central pipe communicate sequentially; a first rubber barrel group, a first pressing block and a first piston sequentially sleeve the outer wall of the first central pipe, a first hydraulic cavity is formed between the end surface of the first piston and the end surface of the packer body, a first sealing sleeve for sealing the first hydraulic cavity is arranged outside the first hydraulic cavity, and the first central pipe is provided with liquid outlets which communicate the inner cavity of the first central pipe with the first hydraulic cavity; a second rubber barrel group, a second pressing block and a second piston sequentially sleeve the outer wall of the second central pipe, a second hydraulic cavity is formed between the end surface of the second piston and the end surface of the packer body, a second sealing sleeve for sealing the first hydraulic cavity is arranged outside the second hydraulic cavity, and the second central pipe is provided with liquid outlets which communicate the inner cavity of the second central pipe with the second hydraulic cavity; a thread is formed in the outer wall of the upper pressing cap; and the one-way valve block is arranged along the axis of the packer body, the one-way valve block comprises two one-way valves which are in axisymmetric distribution based on the axis of the packer body, the flow direction of one one-way valve is from the inside of the high-pressure self-locking packer to the borehole, and the flow direction of the other one-way valve is from the borehole to the inside of the high-pressure self-locking packer.
According to a further aspect of the invention, there is provided a high-pressure self-locking
packer wherein a round hole is formed in the packer plug; when rubber barrels are demounted and
mounted, and a steel column or iron column can penetrate into the round hole to provide reactive
force for demounting and mounting the high-pressure self-locking packer, so that the high-pressure
self-locking packer can be convenient to assembly and components can be convenient to replace;
the outer wall of the first central pipe is provided with a first big shaft segment and a first small shaft segment, the first rubber barrel group sleeves the first big shaft segment, partial inner wall of the first pressing block sleeves the first big shaft segment, and the first piston sleeves the first small shaft segment; the outer wall of the second central pipe is provided with a second big shaft segment and a second small shaft segment, the second rubber barrel group sleeves the second big shaft segment, partial inner wall of the second pressing block sleeves the second big shaft segment, and the second piston sleeves the second small shaft segment; because both the outer wall of the first central pipe and the outer wall of the second central pipe are respectively provided with a shaft shoulder to prevent the first piston and the second piston from excessively extruding the first rubber barrel group and the second rubber barrel group; at least two high-pressure self-locking packers for disassembling the packer plug and the upper pressing cap are arranged between the packer plug and the upper pressing cap; and the first rubber barrel group and the second rubber barrel group respective comprise a plurality of rubber barrels and a distance ring is arranged between every two rubber barrels. The invention further discloses a setting method of the high-pressure self-locking packer. The setting method especially comprises the following steps that Si, the high-pressure connector is connected with a fluid pressurization system through a high-pressure pipeline, the high-pressure self-locking packer is connected with a high-pressure drill rod through the thread in the outer wall of the upper pressing cap together, and drilling is gradually pushed to the deep part to be sealed; S2, the high-pressure fluid pressurized by the fluid pressurization system enters into the high-pressure self-locking packer through the high-pressure connector, the high-pressure fluid enters the inner cavity of the second central pipe, the inner cavity of the packer body and the inner cavity of the first central pipe, then enters the second hydraulic cavity and the first hydraulic cavity through the liquid outlets;
S3, the high-pressure fluid entering the second hydraulic cavity pushes the second piston to transmit hydraulic pressure to the second pressing block, the second pressing block pushes the second rubber barrel group, and the second rubber barrel group begins to expand radially due to the extrusion under pressure; along with the increase of hydraulic pressure, the second rubber barrel group gradually and fully seals the gap between the borehole and the second rubber barrel group to form high-pressure sealing parts; besides, the high-pressure fluid entering the first hydraulic cavity pushes the first piston to transmit hydraulic pressure to the first pressing block, the first pressing block pushes the first rubber barrel group, and the first rubber barrel group begins to expand radially due to the extrusion under pressure; along with the increase of hydraulic pressure, the first rubber barrel group gradually and fully seals the gap between the borehole and the first rubber barrel group to form high-pressure sealing parts; S4, when the pressure of the high-pressure fluid entering the high-pressure self-locking packer reaches a certain degree, the high-pressure fluid opens the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole, and the high-pressure fluid enters the space between the high-pressure self-locking packer and the borehole through the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole; along with the continuous injection of the high-pressure fluid, the pressure of the high-pressure fluid increases rapidly, and the rock masses can be fractured after reaching enough pressure to achieve the purposes of geostress measurement and fracturing; the one-way valves have a certain pressure threshold, and only when the fluid reaches the threshold, the one-way valves can be opened; and before it reaches the threshold, the one-way valves are all closed, and the fluid is blocked inside the high-pressure self-locking packer to expand the rubber barrels; S5, after completion of the purposes of geostress measurement and fracturing, a pressure relief port of the fluid pressurization system is opened directly, the high-pressure fluid enters into the high-pressure self-locking packer through the one-way valves of which the flow direction is from the borehole to the inside of the high-pressure self-locking packer and then flows out of the high-pressure self-locking packer through the high-pressure connector, the first piston relieves the pressure of the first rubber barrel group, and the second piston relieves the pressure of the second rubber barrel group; after the first rubber barrel group and the second rubber barrel group retract, the high-pressure self-locking packer is separated from the borehole, and the high-pressure self-locking packer can be pulled out of the borehole through the high-pressure drill rod connected with the upper pressing cap so as to complete unsealing of the high-pressure self-locking packer. In the test process, the high-pressure fluid in the inner cavity of the first central pipe and the inner cavity of the second central pipe is stored between the first central pipe and the second central pipe of the high-pressure self-locking packer, thrust of the high-pressure fluid against the high-pressure self-locking packer plug through the third rubber barrel, the second rubber barrel and the first rubber barrel is counteracted by reactive force of the high-pressure fluid against the upper pressing cap of the high-pressure self-locking packer through the fourth rubber barrel, the fifth rubber barrel and the sixth rubber barrel; at the same time, the thrust of the high-pressure fluid between the high-pressure self-locking packer and the borehole against the first rubber barrel group is counteracted by the thrust of the high-pressure fluid against the second rubber barrel group, so that the high-pressure self-locking packer can keep balance in the borehole, the high-pressure self-locking packer cannot be ejected from the borehole, and safe self-locking of the high-pressure self-locking packer can be realized. The high-pressure self-locking packer has the following advantages and positive effects that (1) high-pressure sealing parts can be generated by the high-pressure fluid without setting at the wellhead, sealing of high-pressure fluid can be realized by the high-pressure sealing parts, and the maximum sealing pressure of the high-pressure self-locking packer can reach 150MPa.
(2) The in-situ geostress test and the in-situ fracturing test can be performed in the boreholes of
any angle.
(3) The high-pressure self-locking packer can be reused for many times without other
consumables.
(4) The high-pressure self-locking packer is easy to unlock and remove without the hazard of
clamping the hole to damage the packer.
(5) The high-pressure self-locking packer can keep balance in the borehole to realize the
self-locking function without other measures.
Based on the above reasons, the invention can be widely popularized in the fields of rock
engineering, the mining engineering of natural gas, petroleum and mineral products, and the like.
Brief Description of the Drawings
In order to clearly explain the embodiments of the invention or the technical schemes in the
prior art, the drawings to be used in describing the embodiments and the prior art will be briefly
introduced below. It is obvious that the drawings in the descriptions below are some embodiments
of the invention, and for the common technicians in this field, other drawings can also be obtained based on these drawings under the premise without creative labor. FIG.1 is the structural diagram of the high-pressure self-locking packer in an embodiment of the invention. FIG.2 is the pressure resistance curve of the high-pressure self-locking packer in an embodiment of the invention.
Detailed Description
In order to make the purpose, technical schemes and advantages of the embodiments of the
invention clearer, the technical schemes in the embodiments of the invention will be described
clearly and completely below by combining with the drawings in the embodiments of the invention.
Obviously, the described embodiments are only one part of embodiments without all embodiments
of the invention. Based on the embodiments in the invention, all the other embodiments obtained by
the common people skilled in the field under the premise without creative labor will belong to the
protective scope of the invention.
Embodiment 1
As shown in FIG.1, a high-pressure self-locking packer comprises a packer plug 1, a first
central pipe 2, a packer body 3, a second central pipe 4 and an upper pressing cap 5 which are
connected sequentially, wherein
the packer plug 1 is provided with a packer plug connecting part which fixedly sleeves the
outer wall of the first central pipe 2;
the first central pipe 2 is provided with an inner cavity 6 of the first central pipe;
the packer body 3 is provided with an inner cavity 7 of the packer body, a first one-way valve
block and a second one-way valve block communicating the inner cavity 7 of the packer body with
the outer part of the packer body 3 are arranged on the packer body 3, the first one-way valve block
and the second one-way valve block are arranged along the axis of the packer body 3, the first
one-way valve block comprises a first one-way valve 8 and a second one-way valve 9 which are in
axisymmetric distribution based on the axis of the packer body 3, the flow direction of the first
one-way valve 8 is from the inside of the high-pressure self-locking packer to the borehole, the flow
direction of the second one-way valve 9 is from the borehole to the inside of the high-pressure
self-locking packer, the second one-way valve block comprises a third one-way valve 10 and a fourth one-way valve 11 which are in axisymmetric distribution based on the axis of the packer body 3, the flow direction of the third one-way valve 10 is from the inside of the high-pressure self-locking packer to the borehole, the flow direction of the fourth one-way valve 11 is from the borehole to the inside of the high-pressure self-locking packer, and two ends of the inner cavity 7 of the packer body fixedly sleeve the outer wall of the first central pipe 2 and the outer wall of the second central pipe 4, respectively; the second central pipe 4 is provided with an inner cavity 12 of the second central pipe; the upper pressing cap 5 is provided with an upper pressing cap connecting part which fixedly sleeves the outer wall of the second central pipe 4, and a high-pressure connector 13 is arranged on the upper pressing cap 5; the high-pressure connector 13, the inner cavity 12 of the second central pipe, the inner cavity 7 of the packer body and the inner cavity 6 of the first central pipe communicate sequentially; a first rubber barrel group, a first pressing block 14 and a first piston 15 sequentially sleeve the outer wall of the first central pipe 2, a first hydraulic cavity 16 is formed between the end surface of the first piston 15 and the end surface of the packer body 3, a first sealing sleeve 17 for sealing the first hydraulic cavity 16 is arranged outside the first hydraulic cavity 16, and the first central pipe 2 is provided with a first liquid outlet 18 and a second liquid outlet 19 which communicate the inner cavity 6 of the first central pipe with the first hydraulic cavity 16; the first rubber barrel group comprises a first rubber barrel 20, a second rubber barrel 21 and a third rubber barrel 22, a first distance ring 23 is arranged between the first rubber barrel 20 and the second rubber barrel 21, and a second distance ring 24 is arranged between the second rubber barrel 21 and the third rubber barrel 22; a second rubber barrel group, a second pressing block 25 and a second piston 26 sequentially sleeve the outer wall of the second central pipe 4, a second hydraulic cavity 27 is formed between the end surface of the second piston 26 and the end surface of the packer body 3, a second sealing sleeve 28 for sealing the second hydraulic cavity 27 is arranged outside the second hydraulic cavity 27, and the second central pipe 4 is provided with a third liquid outlet 29 and a fourth liquid outlet 30 which communicate the inner cavity 12 of the second central pipe with the second hydraulic cavity 27; the second rubber barrel group comprises a fourth rubber barrel 31, a fifth rubber barrel 32 and a sixth rubber barrel 33, a third distance ring 34 is arranged between the fourth rubber barrel 31 and the fifth rubber barrel 32, and a fourth distance ring 35 is arranged between the fifth rubber barrel 32 and the sixth rubber barrel 33; a thread is formed in the outer wall of the upper pressing cap 5; a round hole 36 is formed in the packer plug 1; the outer wall of the first central pipe 2 is provided with a first big shaft segment and a first small shaft segment, the first rubber barrel group sleeves the first big shaft segment, partial inner wall of the first pressing block 14 sleeves the first big shaft segment, and the first piston 15 sleeves the first small shaft segment; the outer wall of the second central pipe 4 is provided with a second big shaft segment and a second small shaft segment, the second rubber barrel group sleeves the second big shaft segment, partial inner wall of the second pressing block 25 sleeves the second big shaft segment, and the second piston 26 sleeves the second small shaft segment; Embodiment 2
A setting method of the high-pressure self-locking packer of embodiment 1 especially
comprises the following steps that
Si, the high-pressure connector 13 is connected with a fluid pressurization system through a
high-pressure pipeline, the high-pressure self-locking packer is connected with a high-pressure drill
rod through the thread in the outer wall of the upper pressing cap 5 together, and drilling is
gradually pushed to the deep part to be sealed;
S2, the high-pressure fluid pressurized by the fluid pressurization system enters into the
high-pressure self-locking packer through the high-pressure connector 13, the high-pressure fluid
enters the inner cavity 12 of the second central pipe, the inner cavity 7 of the packer body and the
inner cavity 6 of the first central pipe, then enters the second hydraulic cavity 27 through the third
liquid outlet 29 and the fourth liquid outlet 30 and enters the first hydraulic cavity 16 through the
first liquid outlet 18 and the second liquid outlet 19;
S3, the high-pressure fluid entering the second hydraulic cavity 27 pushes the second piston 26
to transmit the hydraulic pressure to the second pressing block 25, the second pressing block 25
pushes the second rubber barrel group, and the second rubber barrel group begins to expand radially
(namely, the fourth rubber barrel 31, the fifth rubber barrel 32 and the sixth rubber barrel 33 expand radially) due to the extrusion under pressure; along with the increase of hydraulic pressure, the second rubber barrel group gradually and fully seals the gap between the borehole and the second rubber barrel group to form three high-pressure sealing parts; besides, the high-pressure fluid entering the first hydraulic cavity 16 pushes the first piston 15 to transmit the hydraulic pressure to the first pressing block 14, the first pressing block 14 pushes the first rubber barrel group, and first rubber barrel group begins to expand radially (namely, the first rubber barrel 20, the second rubber barrel 21 and the third rubber barrel 22 expand radially) due to the extrusion under pressure; along with the increase of hydraulic pressure, the first rubber barrel group gradually and fully seals the gap between the borehole and the first rubber barrel group to form three high-pressure sealing parts; S4, when the pressure of the high-pressure fluid entering the high-pressure self-locking packer reaches a certain degree, the high-pressure fluid opens the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole, and the high-pressure fluid enters the space between the high-pressure self-locking packer and the borehole through the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole; along with the continuous injection of the high-pressure fluid, the pressure of the high-pressure fluid increases rapidly, and the rock masses can be fractured after reaching enough pressure to achieve the purposes of geostress measurement and fracturing; S5, after completion of the purposes of geostress measurement and fracturing, a pressure relief port of the fluid pressurization system is opened directly, the high-pressure fluid enters into the high-pressure self-locking packer through the one-way valves of which the flow direction is from the borehole to the inside of the high-pressure self-locking packer and then flows out of the high-pressure self-locking packer through the high-pressure connector, the first piston relieves the pressure of the first rubber barrel group, and the second piston relieves the pressure of the second rubber barrel group; after the first rubber barrel group and the second rubber barrel group retract, the high-pressure self-locking packer is separated from the borehole, and the high-pressure self-locking packer can be pulled out of the borehole through the high-pressure drill rod connected with the upper pressing cap so as to complete unsealing of the high-pressure self-locking packer. The tests of pressure resistance and sealing performance are performed under 125MPa for the high-pressure self-locking packer. When 125MPa is reached, the connection between the high-pressure self-locking packer and the external pressurization system is closed. As seen from FIG.2, the pressure of the fluid hardly changes in the high-pressure self-locking packer after 20 hours, which indicates that the high-pressure self-locking packer has good sealing performance. Finally, it should be noted that the above embodiments are only used for depicting the technical scheme of the invention rather than limiting the invention. Although the invention is described in detail with reference to the previous embodiments, those of ordinary skilled in the art should understand that: they can still modify the technical scheme recorded in the previous embodiment or make equivalent substitutions of part or all technical features therein; and these modifications or substitutions do not make the nature of the corresponding technical scheme deviate from the scope limited by the technical scheme of the embodiments of the invention. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".
Claims (7)
1. A high-pressure self-locking packer, comprising a packer plug, a first central pipe, a packer body, a second central pipe and an upper pressing cap which are connected sequentially, wherein the packer plug is provided with a packer plug connecting part which fixedly sleeves the outer wall of the first central pipe; the first central pipe is provided with an inner cavity of the first central pipe; the packer body is provided with an inner cavity of the packer body, a plurality of one-way valve blocks enabling the inner cavity of the packer body and the outer part of the packer body to be in communication are arranged on the packer body, and two ends of the inner cavity of the packer body are fixedly connected to the outer wall of the first central pipe and the outer wall of the second central pipe in a sleeving manner; the second central pipe is provided with an inner cavity of the second central pipe; the Tupper pressing cap is provided with an upper pressing cap connecting part which fixedly sleeves the outer wall of the second central pipe, and a high-pressure connector is arranged on the upper pressing cap; the high-pressure connector, the inner cavity of the second central pipe, the inner cavity of the packer body and the inner cavity of the first central pipe communicate sequentially; a first rubber barrel group, a first pressing block and a first piston sequentially sleeve the outer wall of the first central pipe, a first hydraulic cavity is formed between the end surface of the first piston and the end surface of the packer body, a first sealing sleeve for sealing the first hydraulic
cavity is arranged outside the first hydraulic cavity, and the first central pipe is provided with liquid
outlets which communicate the inner cavity of the first central pipe with the first hydraulic cavity;
a second rubber barrel group, a second pressing block and a second piston sequentially sleeve
the outer wall of the second central pipe, a second hydraulic cavity is formed between the end
surface of the second piston and the end surface of the packer body, a second sealing sleeve for
sealing the first hydraulic cavity is arranged outside the second hydraulic cavity, and the second
central pipe is provided with liquid outlets which communicate the inner cavity of the second
central pipe with the second hydraulic cavity;
a thread is formed in the outer wall of the upper pressing cap; and the one-way valve block is arranged along the axis of the packer body, the one-way valve block comprises two one-way valves which are in axisymmetric distribution based on the axis of the packer body, the flow direction of one one-way valve is from the inside of the high-pressure self-locking packer to the borehole, and the flow direction of the other one-way valve is from the borehole to the inside of the high-pressure self-locking packer.
2. The high-pressure self-locking packer according to claim 1, wherein a round hole is formed in the packer plug.
3. The high-pressure self-locking packer according to claim 1, wherein the outer wall of the first central pipe is provided with a first big shaft segment and a first small shaft segment, the first rubber barrel group sleeves the first big shaft segment, partial inner wall of the first pressing block sleeves the first big shaft segment, and the first piston sleeves the first small shaft segment.
4. The high-pressure self-locking packer according to claim 1, wherein the outer wall of the second central pipe is provided with a second big shaft segment and a second small shaft segment, the second rubber barrel group sleeves the second big shaft segment, partial inner wall of the second pressing block sleeves the second big shaft segment, and the second piston sleeves the second small shaft segment.
5. The high-pressure self-locking packer according to claim 1, wherein at least two high-pressure self-locking packers for disassembling the packer plug and the upper pressing cap are arranged between the packer plug and the upper pressing cap;
6. The high-pressure self-locking packer according to claim 1, wherein the first rubber barrel group and the second rubber barrel group respectively comprise a plurality of rubber barrels and a distance ring is arranged between every two rubber barrels.
7. A setting method using the high-pressure self-locking packer according to any one of claims 1-6, comprising the following steps that Si, the high-pressure connector is connected with a fluid pressurization system through a
high-pressure pipeline, the high-pressure self-locking packer is connected with a high-pressure drill rod through the thread in the outer wall of the upper pressing cap together, and drilling is gradually pushed to the deep part to be sealed; S2, the high-pressure fluid pressurized by the fluid pressurization system enters into the high-pressure self-locking packer through the high-pressure connector, the high-pressure fluid enters the inner cavity of the second central pipe, the inner cavity of the packer body and the inner cavity of the first central pipe, then enters the second hydraulic cavity and the first hydraulic cavity through the liquid outlets; S3, the high-pressure fluid entering the second hydraulic cavity pushes the second piston to transmit hydraulic pressure to the second pressing block, the second pressing block pushes the second rubber barrel group, and the second rubber barrel group begins to expand radially due to the extrusion under pressure; along with the increase of hydraulic pressure, the second rubber barrel group gradually and fully seals the gap between the borehole and the second rubber barrel group to form high-pressure sealing parts; besides, the high-pressure fluid entering the first hydraulic cavity pushes the first piston to transmit hydraulic pressure to the first pressing block, the first pressing block pushes the first rubber barrel group, and the first rubber barrel group begins to expand radially due to the extrusion under pressure; along with the increase of hydraulic pressure, the first rubber barrel group gradually and fully seals the gap between the borehole and the first rubber barrel group to form high-pressure sealing parts; S4, when the pressure of the high-pressure fluid entering the high-pressure self-locking packer reaches a certain degree, the high-pressure fluid opens the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole, and the high-pressure fluid enters the space between the high-pressure self-locking packer and the borehole through the one-way valves of which the flow direction is from the inside of the high-pressure self-locking packer to the borehole; along with the continuous injection of the high-pressure fluid, the pressure of the high-pressure fluid increases rapidly, and the rock masses can be fractured after reaching enough pressure to achieve the purposes of geostress measurement and fracturing;
S5, after completion of the purposes of geostress measurement and fracturing, a pressure relief
port of the fluid pressurization system is opened directly, the high-pressure fluid enters into the
high-pressure self-locking packer through the one-way valves of which the flow direction is from
the borehole to the inside of the high-pressure self-locking packer and then flows out of the high-pressure self-locking packer through the high-pressure connector, the first piston relieves the pressure of the first rubber barrel group, and the second piston relieves the pressure of the second rubber barrel group; after the first rubber barrel group and the second rubber barrel group retract, the high-pressure self-locking packer is separated from the borehole, and the high-pressure self-locking packer can be pulled out of the borehole through the high-pressure drill rod connected with the upper pressing cap so as to complete unsealing of the high-pressure self-locking packer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710418487.9A CN107060682B (en) | 2017-06-06 | 2017-06-06 | A kind of high pressure self-locking packer and its set method |
| CN2017104184879 | 2017-06-06 |
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| AU2019201471A1 AU2019201471A1 (en) | 2019-03-28 |
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| CN112012703B (en) * | 2019-05-29 | 2022-08-30 | 中国海洋石油集团有限公司 | Layer-by-layer fixed-point fluid injection device and injection method |
| CN110905438B (en) * | 2020-01-14 | 2024-08-06 | 铁岭曲氏石油技术开发服务有限公司 | Forced unpacking packer and control method thereof |
| CN111502589B (en) * | 2020-04-23 | 2020-11-13 | 中国地质科学院地质力学研究所 | Hydrofracturing method ground stress seals and separates measuring device |
| CN113586003B (en) * | 2021-08-31 | 2023-07-04 | 张卫东 | Linkage setting and diverting leakage finding tool |
| CN114934756B (en) * | 2022-06-28 | 2024-01-05 | 中核通辽铀业有限责任公司 | Well plugging structure, layered liquid extraction amount measuring device and measuring method thereof |
| CN115875456B (en) * | 2023-02-23 | 2023-05-05 | 南通市飞宇石油科技开发有限公司 | Self-expansion anti-seepage high-pressure sealing element for petroleum exploitation pipe |
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| US20090065192A1 (en) * | 2007-09-10 | 2009-03-12 | Schlumberger Technology Corporation | Packer |
| WO2019182805A1 (en) * | 2018-03-23 | 2019-09-26 | Dril-Quip, Inc. | Self-locking packer carrier |
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| US6202742B1 (en) * | 1998-11-03 | 2001-03-20 | Halliburton Energy Services, Inc. | Pack-off device for use in a wellbore having a packer assembly located therein |
| CN202064884U (en) * | 2011-05-10 | 2011-12-07 | 中国石油天然气股份有限公司 | Compensation self-locking packer |
| CN102650202B (en) * | 2012-05-04 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Expansion compression type packer |
| CN104033126B (en) * | 2014-05-14 | 2016-08-17 | 天津市滨海新区龙新石油机械制造有限公司 | Hydraulic expansion self-locking sealing type well flushing able packer |
| CN204113201U (en) * | 2014-08-20 | 2015-01-21 | 濮阳博瑞特石油工程技术有限公司 | Brace type self-locking packer |
| CN105464614B (en) * | 2015-12-16 | 2018-08-10 | 天津市龙新石油机械制造股份有限公司 | Step-by-step releasable flushing packer |
| CN105804688B (en) * | 2016-03-11 | 2018-09-28 | 新疆华隆油田科技股份有限公司 | Compression bidirectional bearing can not flushing packer |
| CN106223898B (en) * | 2016-09-27 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司 | Two horizontal well cementing and completion integrated pipe column devices that open |
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|---|---|---|---|---|
| US20090065192A1 (en) * | 2007-09-10 | 2009-03-12 | Schlumberger Technology Corporation | Packer |
| WO2019182805A1 (en) * | 2018-03-23 | 2019-09-26 | Dril-Quip, Inc. | Self-locking packer carrier |
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| Publication number | Publication date |
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| CN107060682B (en) | 2019-04-12 |
| AU2019201471A1 (en) | 2019-03-28 |
| CN107060682A (en) | 2017-08-18 |
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