CN116084904A - CO capable of multiple linkage protection 2 Auxiliary pressurizing device and method for fracturing - Google Patents
CO capable of multiple linkage protection 2 Auxiliary pressurizing device and method for fracturing Download PDFInfo
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- CN116084904A CN116084904A CN202310026018.8A CN202310026018A CN116084904A CN 116084904 A CN116084904 A CN 116084904A CN 202310026018 A CN202310026018 A CN 202310026018A CN 116084904 A CN116084904 A CN 116084904A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 55
- 239000002184 metal Substances 0.000 claims abstract description 55
- 238000010008 shearing Methods 0.000 claims description 39
- 230000005540 biological transmission Effects 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 238000009825 accumulation Methods 0.000 claims description 21
- 238000005086 pumping Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 7
- 239000002360 explosive Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000003129 oil well Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
-
- 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
- E21B43/14—Obtaining from a multiple-zone well
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- 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)
- Automatic Assembly (AREA)
Abstract
The invention discloses a CO capable of multiple linkage protection 2 The fracturing auxiliary pressurizing device comprises tubular column units which are sequentially connected from top to bottom and have the same structure; the pipe column unit includes: the upper joint, offer the jet hole on the sidewall; the lower joint is fixedly arranged at the lower end of the upper joint; the sliding sleeve is coaxially arranged in the upper joint; the ball seat assembly is fixedly arranged above the sliding sleeve; a metal ball seated within the ball seat assembly; the shear pin penetrates through the upper joint and extends into the sliding sleeve; the tee assembly includes: a ball seat body; diameter-variable ring mounted in the ball seat bodyThe method comprises the steps of carrying out a first treatment on the surface of the The reducing driving element is arranged in the ball seat body; the reducing ring comprises a plurality of ring units, and the ring units can be spliced into a complete ring; the inner side of the ball seat body is provided with a plurality of sliding grooves, the number of the sliding grooves is the same as that of the ring units, and the ring units are slidably arranged in the sliding grooves; the reducing driving element comprises a push rod, and the action end of the push rod is connected with the ring unit.
Description
Technical Field
The present application relates to CO 2 The technical field of oil extraction, in particular to a CO capable of multiple linkage protection 2 A fracturing auxiliary pressurizing device and a method.
Background
The fracturing is an extremely important process technology in the field of petroleum engineering, and is used for improving the flow condition of oil and gas resources in an oil and gas layer so as to facilitate the exploitation of oil and gas.
The ball injection type fracturing technology is characterized in that a horizontal well section is sealed into a plurality of sections by using an open hole packer and a sliding sleeve according to reservoir development requirements, and the sliding sleeve is opened by ball injection during fracturing, so that targeted construction is performed; and the method can also be used for carrying out layered oil extraction and layered water injection. The open hole packer separates every layer of packing, is equipped with a ball seat in every sliding sleeve, and the ball seat increases in proper order upwards, and the level difference is 1/8 or 3/16, sends into oil pipe with low density ball in proper order, pumps to the ball seat of corresponding destination layer in, opens the sliding sleeve, handles the producing layer, and toe end sliding sleeve adopts the differential pressure principle to open.
At present, the ball throwing type fracturing technology is characterized in that the size of a sleeve is fixed, and the sizes of a ball throwing seat and a ball seat are changed from bottom to top in a small to large sequence in a limited space, so that the number of fracturing layers of a single-pass tubular column is extremely limited, the requirement of multi-layer fracturing cannot be met, meanwhile, the construction operation procedure is harsh, the ball throwing sequence must be thrown in sequence from small to large, otherwise, the phenomenon of layer leakage occurs, the construction quality and the construction effect are seriously influenced, even fracturing accidents occur, and serious losses are caused.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
CO capable of multiple linkage protection 2 The fracturing auxiliary pressurizing device comprises tubular column units which are sequentially connected from top to bottom and have the same structure;
the pipe column unit includes:
the upper joint, offer the jet hole on the sidewall;
the lower joint is fixedly arranged at the lower end of the upper joint;
the sliding sleeve is coaxially arranged in the upper joint;
the ball seat assembly is fixedly arranged above the sliding sleeve;
a metal ball seated within the ball seat assembly;
the shear pin penetrates through the upper joint and extends into the sliding sleeve;
wherein, the tee assembly includes:
a ball seat body;
the reducing ring is arranged in the ball seat body;
the reducing driving element is arranged in the ball seat body;
the variable diameter ring comprises a plurality of ring units, and the ring units can be spliced into a complete ring;
the inner side of the ball seat body is provided with a plurality of sliding grooves, the number of the sliding grooves is the same as that of the ring units, and the ring units are slidably arranged in the sliding grooves;
the reducing driving element comprises a push rod, and the action end of the push rod is connected with the ring unit.
Further, the inner side wall of the ring unit is an inclined surface.
Further, a plurality of through holes are formed in the side wall of the upper joint, and the through holes are arranged in an annular array;
the outside of sliding sleeve is provided with annular shear force groove, and the shear force nail runs through the through-hole and stretches into in the annular shear force groove.
Further, a C-shaped shear ring is arranged between the sliding sleeve and the lower connector, and the C-shaped shear ring is positioned below the shear pin;
the inner periphery of the C-shaped shear ring is positioned in the sliding sleeve, and the outer periphery of the C-shaped shear ring is positioned in the lower joint;
the C-shaped shear ring is contracted by shearing force to close the opening of the C-shaped shear ring to form a ring shape, and the shearing force value corresponding to the deformation of the C-shaped shear ring corresponds to the lowest threshold value.
Further, the section of the inner periphery of the C-shaped shear ring is rectangular, an annular accommodating groove is further formed in the outer side of the sliding sleeve, the section of the annular accommodating groove is also rectangular, and the inner periphery of the annular accommodating groove is positioned in the annular accommodating groove;
the outer peripheral section of the C-shaped shear ring is arc-shaped or frustum-shaped, the inner side wall of the lower joint is also provided with an annular extrusion groove, and the shape and the size of the section of the annular extrusion groove are matched with those of the outer peripheral section.
Further, in the C-shaped state, the inner side surface of the inner periphery of the C-shaped shear ring is in clearance fit with the side surface of the annular accommodating groove, so that the C-shaped shear ring can completely enter the annular accommodating groove when being contracted into an annular shape.
Further, the upper end face of the inner periphery is in clearance fit with the top face of the annular accommodating groove, so that the C-shaped shear ring is not subjected to the pressure of the gathering energy of the fracturing medium before the shear nails are sheared and broken.
Further, the variable-diameter driving element further comprises a push rod connecting end and a ring unit connecting end, wherein the push rod connecting end is fixedly connected with the action end of the push rod, the ring unit connecting end is fixedly connected with the ring unit, and the push rod connecting end is abutted against the ring unit connecting end;
when the energy accumulation and pressurization of the fracturing medium do not reach the highest threshold value, the connecting end of the ejector rod and the connecting end of the ring unit are relatively fixed; when the fracturing medium energy gathering pressurization reaches or exceeds the highest threshold value, the ejector rod connecting end and the ring unit connecting end relatively move.
Further, the ejector rod connecting end comprises a connecting block, and the end part of the connecting block is fixedly connected with the action end of the ejector rod;
the connecting block is provided with a mounting cavity, a sliding plate is slidably arranged in the mounting cavity, and a plurality of transmission teeth are fixedly arranged on the upper end surface of the sliding plate;
an elastic element is arranged in the mounting cavity, the upper end of the elastic element is fixedly connected with the lower end surface of the sliding plate, and the lower end of the elastic element is fixedly connected with the bottom wall of the mounting cavity;
the ring unit connecting end comprises an action block and a transmission tooth groove, the transmission tooth groove is fixedly arranged on the lower end surface of the action block, one end of the transmission tooth, which is far away from the sliding plate, is a triangular tooth, and the shape of the transmission tooth groove is matched with that of the transmission tooth;
the transmission teeth are contacted with the transmission tooth grooves at the connecting end of the ring unit.
CO capable of multiple linkage protection 2 The control method of the auxiliary pressurizing device for fracturing, which uses the device, comprises the following steps:
s1, after well cementation perforation of an oil well, connecting CO by using an oil pipe 2 The auxiliary pressurizing device for fracturing is put into the well, and CO 2 The auxiliary pressurizing device for fracturing enters a well bottom target interval through a wellhead device and a shaft, and then CO is added 2 The bottom of the auxiliary pressurizing device for fracturing is anchored hydraulically;
s2, throwing a metal ball into the fracturing auxiliary pressurizing device to enable the metal ball to seal the ball seat assembly of the first pipe column unit at the lowest layer, opening the high-pressure pump, beginning to pump fracturing medium into the fracturing auxiliary pressurizing device to a certain pressure value through an oil pipe, guan Beng, and observing CO 2 The pressure value of the auxiliary pressurizing device for fracturing changes, and the requirement is met if the pressure loss in the pipe is not more than 5% within 5 minutes;
s3, at CO 2 Under the condition that the sealing effect of the auxiliary pressurizing device is good, the high-pressure pump is opened, and CO is continuously fed to the device 2 Pumping a fracturing medium into the fracturing auxiliary pressurizing device until the shearing strength of the shearing force nails is reached, at the moment, the shearing force nails can be sheared off, the sliding sleeve and the ball seat assembly slide downwards and open corresponding injection holes of the shearing force nails, the high-pressure energy-gathering fracturing medium enters the reservoir in an explosive state, and meanwhile, the fracturing medium is continuously injected until the design requirement is met, and energy-gathering fracturing of the reservoir at the lowest layer is completed;
s4, throwing a metal ball for the second time, and enabling the metal ball seat to seal a ball seat assembly of a second tubular column unit;
s5, turning on the high-pressure pump to CO 2 Pumping a fracturing medium into the fracturing auxiliary pressurizing device until the shearing strength of the shearing force nails is reached, at the moment, the shearing force nails can be sheared off, the sliding sleeve and the ball seat assembly slide downwards and open corresponding injection holes of the shearing force nails, the high-pressure energy-gathering fracturing medium enters the reservoir in an explosive state, and meanwhile, the fracturing medium is continuously injected until the design requirement is met, and energy-gathering fracturing of the second reservoir is completed;
s6, repeating the steps S4-5 until the energy-gathering fracturing of the uppermost reservoir is completed;
s7, utilizing fracturing medium to collect energy for multiple timesFracturing the stratum to form a seam net, and continuing to CO 2 Pumping sand-carrying fluid, displacing fluid and the like into the fracturing auxiliary pressurizing device, and pumping propping agent into the fracture to avoid the fracture from closing;
s8, determining the well-stewing time according to the production layer condition, and finally performing flowback operation to complete the whole fracturing process.
Further, S4 includes the following steps:
s41, a pipe column unit needing to work, wherein the ejector rod stretches to drive the ring unit to extend out of the chute, all the ring units are spliced into a complete circular ring, and the reducing ring is reduced so that a metal ball can be seated on a ball seat assembly of the pipe column unit;
s42, retracting the ejector rod to drive the ring unit to retract into the sliding groove so that the diameter-changing ring is increased to enable the metal ball to penetrate through the ball seat assembly of the pipe column unit;
s43, throwing a metal ball, and enabling the metal ball to seal a ball seat assembly of a pipe column unit needing to work.
Further, S5 includes the following steps:
s51, when the energy accumulation and pressurization of a fracturing medium do not reach the lowest threshold value, and the shear nails are broken, the sliding sleeve and the ball seat assembly cannot slide downwards to open the injection hole under the action of the C-shaped shear ring;
s52, continuously pressurizing the fracturing medium until the energy accumulation and pressurization of the fracturing medium reach the lowest threshold value, enabling the shear force value received by the C-shaped shear ring to reach a deformation state, enabling the C-shaped shear ring to shrink down and completely enter the sliding sleeve, enabling the sliding sleeve and the ball seat assembly to slide downwards and open the injection hole, and enabling the fracturing medium meeting the energy accumulation and pressurization condition to enter a reservoir;
s53, when the energy-gathering pressurization of the fracturing medium reaches or exceeds the highest threshold value and the shear pin is not broken, the ejector rod connecting end and the ring unit connecting end relatively move, and the ring unit moves inwards the chute;
and S54, immediately stopping the oil pipe from injecting the fracturing medium into the tubular column unit, and preventing the energy accumulation and pressurization of the fracturing medium from exceeding the upper limit bearable by the reservoir.
The beneficial effects are that:
the auxiliary pressurizing device for carbon dioxide fracturing does not need to prepare ball seat assemblies and metal balls in different sizes, so that the preparation cost is reduced, the ball throwing sequence is not required to be considered when the ball is thrown every time, and the program is simplified. Meanwhile, the number of fracturing layers which can be completed in a single well descending manner is not severely limited by the sizes of the fracturing metal ball and the ball seat, and super-multilayer fracturing is realized.
The outside annular shear force groove of sliding sleeve compares in prior art and sets up the blind hole in the outside of sliding sleeve, and this application need not to align the blind hole in the through-hole and the sliding sleeve outside of top connection lateral wall, the assembly of being convenient for.
When the energy accumulation and pressurization of the fracturing medium do not reach P low When the shear pin is broken, the sliding sleeve cannot slide downwards to open the injection hole under the action of the C-shaped shear ring, so that the fracturing medium with insufficient energy accumulation and pressurization is prevented from entering the reservoir. At this time, the fracturing medium is continuously pressurized until the fracturing medium is pressurized to P by energy accumulation low When the pressure is applied, the shearing force applied to the C-shaped shearing ring reaches a deformation state, the shrinkage of the C-shaped shearing ring is reduced, and the C-shaped shearing ring completely enters the sliding sleeve, so that the sliding sleeve can slide downwards and open the injection hole, and a fracturing medium meeting the energy-gathering pressurizing condition enters the reservoir.
When the pressure of the fracturing medium reaches or exceeds P high When the shear pin is not broken, the ring unit is displaced, and the injection of the fracturing medium is stopped immediately, so that the energy accumulation and pressurization of the fracturing medium are prevented from exceeding the upper limit which can be born by the reservoir.
The ball seat assembly not only can eliminate defects caused by the fact that the sizes of the ball seat and the metal ball are required to be sequentially different, but also can eliminate defects caused by the fact that the energy accumulation and pressurization of fracturing media exceed the upper limit of a reservoir.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a diagram of the overall structure of the device;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an exploded view of the tubular string unit;
FIG. 4 is a cross-sectional view of the tubular string unit;
FIG. 5 is a cross-sectional view of the tee assembly;
FIG. 6 is a top view of a spliced state of a reducing ring;
FIG. 7 is a top view of the diameter-variable ring in a dispersed state;
FIG. 8 is an enlarged view of a portion of FIG. 5 at B;
FIG. 9 is an enlarged view of a portion of FIG. 4 at C;
FIG. 10 is an enlarged view of a portion of FIG. 4 at D;
FIG. 11 is a C-shaped shear ring structure diagram;
fig. 12 is a cross-sectional view of the variable diameter drive element.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1-12, the present embodiment provides a CO capable of multiple linkage protection 2 The auxiliary fracturing pressurization device comprises tubular column units 100 which are sequentially connected from top to bottom, injection holes 101 and shear nails 102 are formed in the side wall of each tubular column unit 100, fracturing media are injected into the tubular column units 100 through oil pipes and continuously pressurized, after the fracturing media reach the opening pressure, the shear nails 102 are broken, the injection holes 101 are opened, and the fracturing media enter a reservoir corresponding to a target interval through the injection holes 101 to impact and fracture the reservoir.
It may be appreciated that, after the oil and gas well is perforated and completed, the carbon dioxide fracturing auxiliary pressurizing device of the embodiment is lowered into the target interval and fixed by using the oil pipe, the number of the pipe column units 100 is determined according to the number requirement of the fracturing target interval, and each pipe column unit 100 is arranged corresponding to the respective target interval.
In this embodiment, the pipe column units 100 include an upper joint 110 and a lower joint 120 fixedly disposed at the lower end of the upper joint 110, the upper joint 110 of each pipe column unit 100 is fixedly connected with the lower joint 120 of the pipe column unit 100 located above, and the lower joint 120 of each pipe column unit 100 is fixedly connected with the upper joint 110 of the pipe column unit 100 located below, so that a plurality of pipe column units 100 are sequentially connected from top to bottom to form a carbon dioxide fracturing auxiliary pressurizing device. The injection hole 101 is formed in a sidewall of the upper joint 110.
The sliding sleeve 130 and the ball seat assembly 140 fixedly arranged above the sliding sleeve 130 are coaxially arranged in the upper joint 110, and the sliding sleeve 130 and the ball seat assembly 140 can slide relative to the upper joint 110; the upper end surface of the sliding sleeve 130 is higher than the injection hole 101 to seal the injection hole 101, and the shear pin 102 penetrates through the upper joint 110 and stretches into the sliding sleeve 130 to fix the upper joint 110 and the sliding sleeve 130 relatively in the axial direction; a metal ball 150 is provided in the tee assembly 140 to block and close the space above and below the metal ball 150.
As a basic principle of the fracturing string, the metal ball 150 divides the inner space of the string unit 100 into two parts, fracturing medium is injected into the space above the metal ball 150 in the string unit 100 through the oil pipe and continuously pressurized and accumulated energy, when the pressure exceeds the load of the shear nails 102, the shear nails 102 are sheared and broken, the sliding sleeve 130 and the ball seat assembly 140 slide downwards and open the corresponding injection holes 101, the fracturing medium enters the reservoir corresponding to the target interval through the injection holes 101, and the accumulated energy fracturing medium impacts and fractures the reservoir.
Also, as in the prior art, the metal ball 150 is seated inside the ball seat assembly 140, and the diameter of the metal ball 150 needs to be greater than the inner diameter of the ball seat assembly 140.
It will be appreciated that in the initial state of the fracturing string, the metal balls 150 are not previously assembled (or only the lowermost string unit 100 is previously assembled with the metal balls 150), and that it is necessary to run a particular string unit 100 and then drop the metal balls 150 into the corresponding ball seat assemblies 140. Accordingly, the inner diameter of the ball seat assembly 140 is gradually increased from bottom to top, and the diameters of the metal balls 150 sequentially added are also sequentially increased to ensure that the metal balls 150 sequentially added from above can be seated in the corresponding ball seat assemblies 140.
However, this is cumbersome in that it is necessary to prepare ball seat assemblies 140 of different sizes and metal balls 150, and the order of the shots must also be considered each time a ball is thrown. A further problem is that the number of fracturing layers that can be completed in a single trip for a carbon dioxide fracturing auxiliary pressurizing device is severely limited by the size of the fracturing metal ball 150 and ball seat.
For this reason, in the present embodiment, the tee assembly 140 includes the tee body 141, and the diameter varying ring 142 and the diameter varying driving member 143 installed inside the tee body 141, when the metal ball 150 put in above needs to pass through the tee assembly 140 of the upper string unit 100 and enter the lower string unit 100 and be seated in the tee assembly 140 of the lower string unit 100, the diameter varying driving member 143 of the upper string unit 100 increases the diameter varying ring 142, and the diameter varying driving member 143 of the lower string unit 100 decreases the diameter varying ring 142.
That is, a pipe string unit 100 is required to operate, the reducing ring 142 of which is reduced so that the metal ball 150 can be seated on the ball seat assembly 140 of the pipe string unit 100; all of the string units 100 above the string unit 100 that are to be operated have their reducing rings 142 enlarged so that the metal balls 150 can pass through the ball seat assembly 140 of the string unit 100.
Therefore, the carbon dioxide fracturing auxiliary pressurizing device of the embodiment does not need to prepare ball seat assemblies 140 and metal balls 150 with different sizes, reduces the preparation cost, does not need to consider the ball throwing sequence every time the ball is thrown, and simplifies the procedure. Meanwhile, the number of fracturing layers which can be completed in a single well is not severely limited by the sizes of the fracturing metal ball 150 and the ball seat, and super-multilayer fracturing is realized.
Specifically, the reducing ring 142 includes a plurality of ring units 144, and the plurality of ring units 144 may be spliced into a complete ring; correspondingly, a plurality of sliding grooves 145 are formed in the inner side of the ball seat body 141, the number of the sliding grooves 145 is the same as that of the ring units 144, and the ring units 144 are slidably arranged in the sliding grooves 145; the variable diameter driving element 143 includes a jack 146, and an actuating end of the jack 146 is connected to the ring unit 144.
Thus, when it is desired that the metal ball 150 passes through the ball seat assembly 140, the ram 146 contracts to drive the ring unit 144 to retract into the chute 145; when the metal ball 150 is required to be seated on the ball seat assembly 140, the ejector rod 146 stretches to drive the ring units 144 to extend out of the sliding grooves 145, and all the ring units 144 are spliced into a complete ring. Preferably, the number of ring units 144 is four.
Further, the inner side wall of the ring unit 144 is formed with a slope 147 to ensure sealing property when the metal ball 150 is seated on the ball seat assembly 140.
In this embodiment, the side wall of the upper joint 110 is provided with a plurality of through holes 111, and the plurality of through holes 111 are arranged in an annular array, so that the shear pin 102 can penetrate through the side wall of the upper joint 110; correspondingly, the outside of the sliding sleeve 130 is provided with an annular shear groove 131 so that the shear pins 102 penetrating the side wall of the upper joint 110 extend into the sliding sleeve 130, thereby maintaining the upper joint 110 and the sliding sleeve 130 relatively fixed.
It should be noted that, compared with the prior art that the blind hole is formed on the outer side of the sliding sleeve 130, the embodiment does not need to align the through hole 111 on the side wall of the upper connector 110 and the blind hole on the outer side of the sliding sleeve 130, so as to facilitate assembly. Preferably, the number of through holes 111 is four, and correspondingly, the number of shear pins 102 is also four.
It will be appreciated that the shear pin 102 shear fracture strength needs to be tailored to the formation fracture pressure in order to produce a better focused energy impact effect. That is, the maximum shear force that shear pin 102 can withstand needs to match the pressurization of the injected fracturing medium in the space above metal ball 150.
However, the fracturing medium pressure corresponding to the formation fracture of the reservoir needs to be such that a certain interval, i.e. the fracturing medium in the space above the metal sphere 150 can be pressurized to a certain interval (for convenience of description, this interval is expressed as [ P ] low (lowest threshold), P high (highest threshold)]) The shear pin 102 can fracture. That is, the fracturing medium energy-gathering pressurization does not reach P low Value, shear nail102, or the fracturing medium is pressurized beyond P high The shear pin 102 has not yet broken, which is an undesirable result.
In order to solve the above-mentioned problem, in the present embodiment, a C-shaped shear ring 160 is further disposed between the sliding sleeve 130 and the upper connector 110 (or the lower connector 120), and the C-shaped shear ring 160 is located below the shear pin 102. Specifically, the drawings illustrate that the C-shaped shear ring 160 is disposed between the sliding sleeve 130 and the lower connector 120.
Wherein, the inner periphery 161 of the C-shaped shear ring 160 is positioned in the sliding sleeve 130, and the outer periphery 162 of the C-shaped shear ring 160 is positioned in the lower joint 120, so as to ensure that the sliding sleeve 130 and the lower joint 120 are relatively fixed in the axial direction; and, the C-shaped shear ring 160 is shear contractible to close the opening 163 of the C-shaped shear ring 160, thereby forming a ring shape.
Thus, when the shear force applied to the C-shaped shear ring 160 does not reach the deformed state, the inner periphery 161 of the C-shaped shear ring is positioned in the sliding sleeve 130, and the outer periphery 162 of the C-shaped shear ring is positioned in the lower connector 120, so that the sliding sleeve 130 and the lower connector 120 are kept relatively fixed. When the shearing force value received by the C-shaped shearing ring 160 reaches the deformation state, the C-shaped shearing ring 160 is contracted into a ring shape, the diameter is reduced, and the C-shaped shearing ring 160 completely enters the sliding sleeve 130, so that the sliding sleeve 130 and the ball seat assembly 140 can slide down and open the injection hole 101.
Through the arrangement, when the energy-gathering pressurization of the fracturing medium does not reach P low When the shear pins 102 break, the sliding sleeve 130 and the ball seat assembly 140 cannot slide down to open the injection holes 101 under the action of the C-shaped shear ring 160, so that insufficient pressure fracturing medium is prevented from entering the reservoir. At this time, the fracturing medium is continuously pressurized until the fracturing medium is pressurized to P by energy accumulation low When the pressure is applied, the shearing force applied to the C-shaped shearing ring 160 reaches a deformation state, and the shrinkage of the shearing force is reduced and the shearing force completely enters the sliding sleeve 130, so that the sliding sleeve 130 and the ball seat assembly 140 can slide downwards and open the injection hole 101, and the fracturing medium meeting the energy-gathering pressurizing condition enters the reservoir.
It will be appreciated that the C-shaped shear ring 160 deforms to a shear value corresponding to P low Corresponding to the above.
Specifically, the section of the inner periphery 161 of the C-shaped shear ring 160 is rectangular, the outer side of the sliding sleeve 130 is also provided with an annular accommodating groove 132, the section of the annular accommodating groove 132 is also rectangular, and the inner periphery 161 is positioned in the annular accommodating groove 132; the outer periphery 162 of the C-shaped shear ring 160 is arc-shaped or frustum-shaped in cross section, the inner side wall of the lower joint 120 is also provided with an annular extrusion groove 121, and the shape and the size of the cross section of the annular extrusion groove 121 are matched with those of the outer periphery 162.
More specifically, the C-shaped shear ring 160 is configured such that the inner side 164 of the inner periphery 161 thereof is in clearance fit with the side of the annular receiving groove 132 in the C-shaped configuration such that the C-shaped shear ring 160 is fully received within the annular receiving groove 132 when contracted into an annular configuration.
The upper end surface 165 of the inner periphery 161 is in clearance fit with the top surface of the annular accommodating groove 132, so that before the shear pin 102 is sheared and broken, the C-shaped shear ring 160 is not subjected to the energy gathering pressure of the fracturing medium, and the C-shaped shear ring 160 is prevented from sharing the shearing force borne by the shear pin 102, so that the maximum shearing force borne by the shear pin 102 is ensured to be matched with the pressurizing of the injected fracturing medium in the space above the metal ball 150.
On the other hand, in the present embodiment, the variable diameter driving element 143 further includes a jack connecting end 170 and a ring unit connecting end 180, the jack connecting end 170 is fixedly connected with the action end of the jack 146, the ring unit connecting end 180 is fixedly connected with the ring unit 144, and the jack connecting end 170 is in contact with the ring unit connecting end 180;
wherein the fracturing medium energy-gathering pressurization does not reach P high When the value is calculated, the ejector rod connecting end 170 and the ring unit connecting end 180 are relatively fixed; fracturing medium energy-gathering pressurization reaches or exceeds P high In this case, the jack connection 170 and the ring unit connection 180 are moved relatively.
Thus, the fracturing medium energy-gathering pressurization does not reach P high When the shear pin 102 is broken, that is, in a normal state, the ejector rod connecting end 170 and the ring unit connecting end 180 are kept relatively fixed all the time, and the ring unit 144 cannot be displaced under the action of the ejector rod 146. In contrast, in abnormal conditions, the fracturing medium can accumulate pressure to or above P high When the shear pin 102 is not broken, the ejector rod connecting end 170 and the ring unit connecting end 180 relatively move, and the ring unit 144 moves towardsAnd is displaced in the chute 145.
It will be appreciated that the variable diameter drive element 143 also includes a sensor for feeding back a signal to the control system and stopping the injection of fracturing medium into the tubular string unit 100 by the tubing when the ram connection 170 and the ring unit connection 180 are moved relative to each other.
Through the arrangement, when the energy-gathering pressurization of the fracturing medium reaches or exceeds P high When the shear pins 102 are not broken, the ring units 144 are displaced, and the injection of the fracturing medium is stopped immediately, so that the fracturing medium is prevented from being pressurized beyond the upper limit of the reservoir. At the same time, due to the displacement of the ring units 144, gaps are generated between adjacent ring units 144, a part of the fracturing medium can be discharged, the action end of the ejector rod 146 is extended, and when the fracturing medium is lower than P high After the adjustment, the ejector rod connecting end 170 can drive the ring unit connecting end 180 and the ring unit 144 to move out of the chute 145 until the diameter-variable ring 142 is restored to a complete ring.
Therefore, the ball seat assembly 140 of the present embodiment can eliminate not only the drawbacks caused by the sequential different sizes of the ball seat and the metal ball, but also the drawbacks caused by the pressure build-up of the fracturing medium exceeding the upper limit that the reservoir can withstand.
Specifically, the ejector rod connecting end 170 includes a connecting block 171, and an end of the connecting block 171 is fixedly connected with an action end of the ejector rod 146; the connecting block 171 is provided with a mounting cavity 172, a sliding plate 173 is slidably arranged in the mounting cavity 172, and a plurality of transmission teeth 174 are fixedly arranged on the upper end surface of the sliding plate 173; an elastic element 175 is arranged in the mounting cavity 172, the upper end of the elastic element 175 is fixedly connected with the lower end face of the sliding plate 173, and the lower end is fixedly connected with the bottom wall of the mounting cavity 172.
Wherein the driving teeth 174 are indirectly connected with the elastic element 175, the driving teeth 174 are in contact with the ring unit connecting end 180, i.e. the driving teeth 174 are parts of the connection between the ejector rod connecting end 170 and the ring unit connecting end 180. Specifically, the drive teeth 174 contact the drive splines 182 of the ring unit connection end 180.
The ring unit connecting end 180 comprises an action block 181 and a transmission tooth groove 182, the transmission tooth groove 182 is fixedly arranged on the lower end face of the action block 181, one end, far away from the sliding plate 173, of the transmission tooth 174 is a triangular tooth, and the shape of the transmission tooth groove 182 is matched with that of the transmission tooth 174.
Through the arrangement, when the energy-gathering pressurization of the fracturing medium does not reach P high When the device is used, the transmission teeth 174 extend out of the connecting block 171 under the action of the elastic element 175, the transmission teeth 174 are attached to the transmission tooth grooves 182, and the ejector rod connecting end 170 and the ring unit connecting end 180 are relatively fixed;
when the pressure of the fracturing medium reaches or exceeds P high When the force is applied, the transmission teeth 174 and the transmission tooth grooves 182 are mutually extruded, the vertical component force of the extrusion force of the transmission teeth 174 and the transmission tooth grooves 182 is larger than the elastic force of the elastic element 175, the sliding plate 173 extrudes the elastic element 175 to shrink and elastically deform, the transmission teeth 174 enter the adjacent transmission tooth grooves 182 from one transmission tooth groove 182, and the ejector rod connecting end 170 and the ring unit connecting end 180 relatively move.
Thereby realizing that the energy accumulation and pressurization of the fracturing medium do not reach P high When values are taken, the ring unit 144 remains relatively fixed; fracturing medium energy-gathering pressurization reaches or exceeds P high At this point, the ring unit 144 is displaced into the chute 145. Thus, the ball seat assembly 140 of the present embodiment not only has a reducing function, but also avoids drawbacks associated with the ability of the fracturing medium to accumulate pressure beyond the upper limit that the reservoir can withstand.
It will be appreciated that the resilient element 175 is preferably an actively controlled spring such that CO 2 Corresponding different P of the auxiliary pressurizing device facing different working conditions high The value can be adjusted, and the applicability of the device is improved. Preferably, the elastic element 175 is an electromagnetic spring or a magnetorheological elastomer.
The embodiment also provides a CO capable of multiple linkage protection 2 The control method of the auxiliary pressurizing device for fracturing comprises the following steps:
s1, after well cementation perforation of an oil well, connecting CO by using an oil pipe 2 The auxiliary pressurizing device for fracturing is put into the well, and CO 2 The auxiliary pressurizing device for fracturing enters a well bottom target interval (perforating interval) through a wellhead device and a shaft, and then CO is added 2 The bottom of the auxiliary pressurizing device for fracturing is anchored hydraulically;
s2, throwing in the metal ball 150, enabling the metal ball 150 to seat the ball seat assembly 140 of the lowest layer (the first from bottom to top) tubular column unit 100, turning on the high-pressure pump, and starting to flow into CO through the oil pipe 2 Pumping fracturing medium into the auxiliary pressurizing device for fracturing until a certain pressure value is reached, guan Beng, and observing CO 2 The pressure value of the fracturing auxiliary pressurizing device changes, if the pressure loss in the pipe does not exceed 5% within 5 minutes, the requirement is met, the plugging effect is good (the sealing effect of the whole system is good), and the next operation can be implemented;
s3, at CO 2 Under the condition that the sealing effect of the auxiliary pressurizing device is good, the high-pressure pump is opened, and CO is continuously fed to the device 2 Pumping a fracturing medium into the fracturing auxiliary pressurizing device until the shearing strength of the shear nails 102 is reached, at the moment, shearing the shear nails 102, sliding the sliding sleeve 130 and the ball seat assembly 140 downwards and opening the corresponding injection holes 101, enabling the high-pressure energy-gathering fracturing medium to enter the reservoir in an explosive state, and simultaneously continuously injecting the fracturing medium until the design requirement is met, and completing energy-gathering fracturing of the reservoir at the lowest layer;
s4, putting the metal ball 150 for the second time, and enabling the metal ball 150 to seat the ball seat assembly 140 of the second tubular column unit 100;
s5, turning on the high-pressure pump to CO 2 Pumping a fracturing medium into the fracturing auxiliary pressurizing device until the shearing strength of the shear nails 102 is reached, at the moment, shearing the shear nails 102, sliding the sliding sleeve 130 and the ball seat assembly 140 downwards and opening the corresponding injection holes 101, enabling the high-pressure energy-gathering fracturing medium to enter the reservoir in an explosive state, and simultaneously continuously injecting the fracturing medium until the design requirement is met, and completing energy-gathering fracturing of the second reservoir;
s6, repeating the steps S4-5 until the energy-gathering fracturing of the uppermost reservoir is completed;
s7, fracturing the stratum by utilizing the fracturing medium for multiple times and gathering energy, and continuing to carry out CO (carbon monoxide) fracturing after forming a stitch net 2 Pumping sand-carrying fluid, displacing fluid and the like into the fracturing auxiliary pressurizing device, and pumping propping agent into the fracture to avoid the fracture from closing;
s8, determining the well-stewing time according to the production layer condition, and finally performing flowback operation to complete the whole fracturing process.
Further, S4 includes the following steps:
s41, a pipe column unit 100 needing to be operated, wherein a push rod 146 stretches to drive a ring unit 144 to extend out of a sliding groove 145, all the ring units 144 are spliced into a complete ring, and a reducing ring 142 is reduced so that a metal ball 150 can be seated on a ball seat assembly 140 of the pipe column unit 100;
s42, retracting the ejector rod 146 to drive the ring unit 144 to retract into the sliding groove 145 for all the pipe column units 100 above the pipe column units 100 to be operated, and enlarging the reducing ring 142 so that the metal ball 150 can penetrate through the ball seat assembly 140 of the pipe column unit 100;
and S43, throwing the metal ball 150, and enabling the metal ball 150 to seat the ball seat assembly 140 of the pipe column unit 100 needing to work.
Further, S5 includes the following steps:
s51, when the energy accumulation and pressurization of the fracturing medium do not reach P low When the shear pin 102 breaks, the sliding sleeve 130 and the ball seat assembly 140 cannot slide down to open the injection hole 101 under the action of the C-shaped shear ring 160;
s52, continuously pressurizing the fracturing medium until the fracturing medium is pressurized to P by energy accumulation low When the pressure is applied, the shearing force applied to the C-shaped shearing ring 160 reaches a deformation state, and the shrinkage of the shearing force is reduced and the shearing force completely enters the sliding sleeve 130, so that the sliding sleeve 130 and the ball seat assembly 140 can slide downwards and open the injection hole 101, and a fracturing medium meeting the energy-gathering pressurizing condition enters a reservoir;
s53, fracturing medium energy-gathering pressurization reaches or exceeds P high When the shear force is applied, the shear force nail 102 is not broken yet, the ejector rod connecting end 170 and the ring unit connecting end 180 relatively move, and the ring unit 144 moves into the chute 145;
and S54, immediately stopping the injection of the fracturing medium into the tubular column unit 100 by the oil pipe, and preventing the energy accumulation and pressurization of the fracturing medium from exceeding the upper limit bearable by the reservoir.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. CO capable of multiple linkage protection 2 The fracturing auxiliary pressurizing device comprises tubular column units which are sequentially connected from top to bottom and have the same structure;
the pipe column unit includes:
the upper joint, offer the jet hole on the sidewall;
the lower joint is fixedly arranged at the lower end of the upper joint;
the sliding sleeve is coaxially arranged in the upper joint;
the ball seat assembly is fixedly arranged above the sliding sleeve;
a metal ball seated within the ball seat assembly;
the shear pin penetrates through the upper joint and extends into the sliding sleeve;
wherein, the ball seat subassembly includes:
a ball seat body;
the reducing ring is arranged in the ball seat body;
the reducing driving element is arranged in the ball seat body;
the variable diameter ring comprises a plurality of ring units, and the ring units can be spliced into a complete ring;
the inner side of the ball seat body is provided with a plurality of sliding grooves, the number of the sliding grooves is the same as that of the ring units, and the ring units are slidably arranged in the sliding grooves;
the reducing driving element comprises a push rod, and the action end of the push rod is connected with the ring unit.
2. The apparatus according to claim 1, wherein: the inner side wall of the ring unit is an inclined plane.
The side wall of the upper joint is provided with a plurality of through holes which are arranged in an annular array;
the outside of sliding sleeve is provided with annular shear force groove, and the shear force nail runs through the through-hole and stretches into in the annular shear force groove.
3. The apparatus according to claim 1, wherein: a C-shaped shear ring is further arranged between the sliding sleeve and the lower connector, and the C-shaped shear ring is positioned below the shear pin;
the inner periphery of the C-shaped shear ring is positioned in the sliding sleeve, and the outer periphery of the C-shaped shear ring is positioned in the lower joint;
the C-shaped shear ring is contracted by shearing force to close the opening of the C-shaped shear ring to form a ring shape, and the shearing force value corresponding to the deformation of the C-shaped shear ring corresponds to the lowest threshold value.
4. A device according to claim 3, characterized in that: the section of the inner periphery of the C-shaped shear ring is rectangular, an annular accommodating groove is also formed in the outer side of the sliding sleeve, the section of the annular accommodating groove is also rectangular, and the inner periphery of the annular accommodating groove is positioned in the annular accommodating groove;
the outer peripheral section of the C-shaped shear ring is arc-shaped or frustum-shaped, the inner side wall of the lower joint is also provided with an annular extrusion groove, and the shape and the size of the section of the annular extrusion groove are matched with those of the outer peripheral section;
the inner side surface of the inner periphery of the C-shaped shear ring is in clearance fit with the side surface of the annular accommodating groove in the C-shaped state, so that the C-shaped shear ring can completely enter the annular accommodating groove when being contracted into an annular shape.
5. The apparatus according to claim 4, wherein: the upper end face of the inner periphery is in clearance fit with the top face of the annular accommodating groove, so that the C-shaped shear ring is not subjected to the energy accumulation and pressure of the fracturing medium before the shear nails are sheared and broken.
6. The apparatus according to claim 1, wherein: the variable-diameter driving element further comprises a push rod connecting end and a ring unit connecting end, wherein the push rod connecting end is fixedly connected with the action end of the push rod;
when the energy accumulation and pressurization of the fracturing medium do not reach the highest threshold value, the connecting end of the ejector rod and the connecting end of the ring unit are relatively fixed; when the fracturing medium energy gathering pressurization reaches or exceeds the highest threshold value, the ejector rod connecting end and the ring unit connecting end relatively move.
7. The apparatus according to claim 6, wherein: the ejector rod connecting end comprises a connecting block, and the end part of the connecting block is fixedly connected with the action end of the ejector rod;
the connecting block is provided with a mounting cavity, a sliding plate is slidably arranged in the mounting cavity, and a plurality of transmission teeth are fixedly arranged on the upper end surface of the sliding plate;
an elastic element is arranged in the mounting cavity, the upper end of the elastic element is fixedly connected with the lower end surface of the sliding plate, and the lower end of the elastic element is fixedly connected with the bottom wall of the mounting cavity;
the ring unit connecting end comprises an action block and a transmission tooth groove, the transmission tooth groove is fixedly arranged on the lower end surface of the action block, one end of the transmission tooth, which is far away from the sliding plate, is a triangular tooth, and the shape of the transmission tooth groove is matched with that of the transmission tooth;
the transmission teeth are contacted with the transmission tooth grooves at the connecting end of the ring unit.
8. CO capable of multiple linkage protection 2 A method of controlling a frac-assisted supercharging device using a device according to any one of claims 1 to 7, comprising the steps of:
s1, after well cementation perforation of an oil well, connecting CO by using an oil pipe 2 The auxiliary pressurizing device for fracturing is put into the well, and CO 2 The auxiliary pressurizing device for fracturing enters a well bottom target interval through a wellhead device and a shaft, and then CO is added 2 The bottom of the auxiliary pressurizing device for fracturing is anchored hydraulically;
s2, throwing a metal ball into the fracturing auxiliary pressurizing device to enable the metal ball to seal the ball seat assembly of the first pipe column unit at the lowest layer, opening the high-pressure pump, beginning to pump fracturing medium into the fracturing auxiliary pressurizing device to a certain pressure value through an oil pipe, guan Beng, and observing CO 2 The pressure value of the auxiliary pressurizing device for fracturing changes, and the requirement is met if the pressure loss in the pipe is not more than 5% within 5 minutes;
s3, at CO 2 Under the condition that the sealing effect of the auxiliary pressurizing device is good, the high-pressure pump is opened, and CO is continuously fed to the device 2 Pumping fracturing medium into the fracturing auxiliary pressurizing device untilThe shearing strength of the shear nail is achieved, the shear nail is sheared at the moment, the sliding sleeve and the ball seat assembly slide downwards and open corresponding injection holes of the shear nail, the high-pressure energy-collecting fracturing medium enters the reservoir in an explosive state, and meanwhile, the fracturing medium is continuously injected until the design requirement is met, and energy-collecting fracturing of the reservoir at the lowest layer is completed;
s4, throwing a metal ball for the second time, and enabling the metal ball seat to seal a ball seat assembly of a second tubular column unit;
s5, turning on the high-pressure pump to CO 2 Pumping a fracturing medium into the fracturing auxiliary pressurizing device until the shearing strength of the shearing force nails is reached, at the moment, the shearing force nails can be sheared off, the sliding sleeve and the ball seat assembly slide downwards and open corresponding injection holes of the shearing force nails, the high-pressure energy-gathering fracturing medium enters the reservoir in an explosive state, and meanwhile, the fracturing medium is continuously injected until the design requirement is met, and energy-gathering fracturing of the second reservoir is completed;
s6, repeating the steps S4-5 until the energy-gathering fracturing of the uppermost reservoir is completed;
s7, fracturing the stratum by utilizing the fracturing medium for multiple times and gathering energy, and continuing to carry out CO (carbon monoxide) fracturing after forming a stitch net 2 Pumping sand-carrying fluid, displacing fluid and the like into the fracturing auxiliary pressurizing device, and pumping propping agent into the fracture to avoid the fracture from closing;
s8, determining the well-stewing time according to the production layer condition, and finally performing flowback operation to complete the whole fracturing process.
9. The method according to claim 8, wherein: s4 comprises the following steps:
s41, a pipe column unit needing to work, wherein the ejector rod stretches to drive the ring unit to extend out of the chute, all the ring units are spliced into a complete circular ring, and the reducing ring is reduced so that a metal ball can be seated on a ball seat assembly of the pipe column unit;
s42, retracting the ejector rod to drive the ring unit to retract into the sliding groove so that the diameter-changing ring is increased to enable the metal ball to penetrate through the ball seat assembly of the pipe column unit;
s43, throwing a metal ball, and enabling the metal ball to seal a ball seat assembly of a pipe column unit needing to work.
10. The method according to claim 9, wherein: s5 comprises the following steps:
s51, when the energy accumulation and pressurization of a fracturing medium do not reach the lowest threshold value, and the shear nails are broken, the sliding sleeve and the ball seat assembly cannot slide downwards to open the injection hole under the action of the C-shaped shear ring;
s52, continuously pressurizing the fracturing medium until the energy accumulation and pressurization of the fracturing medium reach the lowest threshold value, enabling the shear force value received by the C-shaped shear ring to reach a deformation state, enabling the C-shaped shear ring to shrink down and completely enter the sliding sleeve, enabling the sliding sleeve and the ball seat assembly to slide downwards and open the injection hole, and enabling the fracturing medium meeting the energy accumulation and pressurization condition to enter a reservoir;
s53, when the energy-gathering pressurization of the fracturing medium reaches or exceeds the highest threshold value and the shear pin is not broken, the ejector rod connecting end and the ring unit connecting end relatively move, and the ring unit moves inwards the chute;
and S54, immediately stopping the oil pipe from injecting the fracturing medium into the tubular column unit, and preventing the energy accumulation and pressurization of the fracturing medium from exceeding the upper limit bearable by the reservoir.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310026018.8A CN116084904B (en) | 2023-01-09 | 2023-01-09 | CO capable of multiple linkage protection2Auxiliary pressurizing device and method for fracturing |
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| CN202310026018.8A CN116084904B (en) | 2023-01-09 | 2023-01-09 | CO capable of multiple linkage protection2Auxiliary pressurizing device and method for fracturing |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203403872U (en) * | 2013-07-19 | 2014-01-22 | 中国石油集团长城钻探工程有限公司 | Multistage fracturing well completion sliding sleeve device |
| CN104234661A (en) * | 2014-09-12 | 2014-12-24 | 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 | One ball multiple-opening type sliding sleeve switch |
| CN104343430A (en) * | 2013-08-07 | 2015-02-11 | 胜利油田胜机石油装备有限公司 | Method for staged fracturing of well cementation casing string and tool for method |
| CN204186351U (en) * | 2014-10-21 | 2015-03-04 | 中国石油集团川庆钻探工程有限公司 | Reducing ball seat sectional control sliding sleeve for fracture acidizing of oil and gas well |
| WO2016112612A1 (en) * | 2015-01-15 | 2016-07-21 | 深圳市百勤石油技术有限公司 | Ball seat assembly and ball throwing sliding sleeve type fracturing device |
-
2023
- 2023-01-09 CN CN202310026018.8A patent/CN116084904B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203403872U (en) * | 2013-07-19 | 2014-01-22 | 中国石油集团长城钻探工程有限公司 | Multistage fracturing well completion sliding sleeve device |
| CN104343430A (en) * | 2013-08-07 | 2015-02-11 | 胜利油田胜机石油装备有限公司 | Method for staged fracturing of well cementation casing string and tool for method |
| CN104234661A (en) * | 2014-09-12 | 2014-12-24 | 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 | One ball multiple-opening type sliding sleeve switch |
| CN204186351U (en) * | 2014-10-21 | 2015-03-04 | 中国石油集团川庆钻探工程有限公司 | Reducing ball seat sectional control sliding sleeve for fracture acidizing of oil and gas well |
| WO2016112612A1 (en) * | 2015-01-15 | 2016-07-21 | 深圳市百勤石油技术有限公司 | Ball seat assembly and ball throwing sliding sleeve type fracturing device |
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