CN110965978A - Horizontal well repeated fracturing tool and horizontal well repeated fracturing process method - Google Patents
Horizontal well repeated fracturing tool and horizontal well repeated fracturing process method Download PDFInfo
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- CN110965978A CN110965978A CN202010006130.1A CN202010006130A CN110965978A CN 110965978 A CN110965978 A CN 110965978A CN 202010006130 A CN202010006130 A CN 202010006130A CN 110965978 A CN110965978 A CN 110965978A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008569 process Effects 0.000 title claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 239000004576 sand Substances 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 210000002445 nipple Anatomy 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000000725 suspension Substances 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
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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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
- E21B43/11—Perforators; Permeators
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Abstract
The invention provides a horizontal well repeated fracturing tool and a horizontal well repeated fracturing process method. Wherein, horizontal well repeated fracturing instrument includes: the annular space is formed between the pipe body and the shaft, and the side surface of the pipe body is provided with an inlet for flowing in the fracturing fluid and an outlet for flowing out the fracturing fluid; a top packer; a middle packer; slip packer, top packer, middle part packer and slip packer are kept away from the direction of well head along the body and are established in the body outside at the interval cover in proper order, and top packer is located the well head and is closest to between the perforation of well head, forms between middle part packer and the slip packer to be used for holding the fracturing region of waiting to reform transform the perforation, and the entry is located between top packer and the well head, and the export is located the fracturing region. The invention solves the problem that the mechanical packing mode in the prior art cannot meet the requirement of repeated fracturing.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a horizontal well repeated fracturing tool and a horizontal well repeated fracturing process method.
Background
The continuous progress of the staged fracturing technology of the horizontal well helps exploration and development to switch from a conventional oil reservoir to a compact oil reservoir. Because the heterogeneity of oil deposit causes part horizontal well section transformation inadequately in the fracturing process, this just makes horizontal well section not fully utilized, influences the development benefit. The horizontal well repeated fracturing technology has also received attention from those skilled in the art as one of the ways to solve this problem. The existing technical ideas are mainly three, one is that repeated reconstruction is carried out in a chemical temporary plugging mode, and the second is that repeated reconstruction is carried out in a shaft reconstruction mode by adopting an expansion pipe; and the third method is to adopt a mechanical packing mode for modification.
The chemical temporary plugging repeated fracturing process is characterized in that a temporary plugging agent is pumped into a horizontal well section by using pad fluid, and the amount of the temporary plugging agent entering each perforation hole is different due to the difference of starting pressures of the horizontal well section used and unused well sections, so that the purpose of temporarily plugging the used well section to transform the unused well section is achieved. In the implementation process, the dosage of the temporary plugging agent cannot be controlled, so that the process fails; the position of repeated transformation cannot be determined in the fracturing process, and the position can be judged only by experience; the fixed-point fracturing can not be implemented, so that the use amount of the fracturing fluid and the propping agent is large in the repeated fracturing process, and the cost is high.
The expansion pipe secondary well completion technology is a technology for repairing a perforation well section by using an expansion pipe and then repeatedly transforming, the technology can restore the integrity of a shaft after the perforation well section is completely repaired, the difficulty of the re-fracturing technology is low, but the problem that the longer the horizontal well section is, the more difficulty is in implementing the repairing technology, the higher the cost is.
And repeatedly transforming in a mechanical packing mode, separating the well section to be transformed by adopting a packer, and performing secondary fracturing in an oil pipe injection mode. At present, the more applied process is a double-seal single-clamp dragging fracturing process. The process has the characteristic of strong improvement pertinence, but the oil pipe injection construction displacement is limited, so that the large-scale requirement of repeated improvement cannot be met. And the other method is to adopt a tail pipe suspension mode to reform layer by layer, so that the construction displacement and scale are large, but the deblocking difficulty is large.
Disclosure of Invention
The invention mainly aims to provide a horizontal well repeated fracturing tool and a horizontal well repeated fracturing process method, and aims to solve the problem that a mechanical packing mode in the prior art cannot meet repeated fracturing requirements.
In order to achieve the above object, according to one aspect of the present invention, there is provided a horizontal well re-fracturing tool comprising: the annular space is formed between the pipe body and the shaft, and the side surface of the pipe body is provided with an inlet for flowing in the fracturing fluid and an outlet for flowing out the fracturing fluid; a top packer; a middle packer; slip packer, top packer, middle part packer and slip packer are kept away from the direction of well head along the body and are established in the body outside at the interval cover in proper order, and top packer is located the well head and is closest to between the perforation of well head, forms between middle part packer and the slip packer to be used for holding the fracturing region of waiting to reform transform the perforation, and the entry is located between top packer and the well head, and the export is located the fracturing region.
Further, the horizontal well re-fracturing tool further comprises: the circulating valve is positioned at the inlet, controls the inlet to be opened when the pipe body is lifted upwards, and controls the inlet to be closed when the pipe body is released; the fracturing sand blaster is located at the outlet, the outlet is controlled to be opened and the pipe body is blocked when the pipe body is lifted upwards, and the outlet is controlled to be closed and the pipe body is opened when the pipe body is released.
Further, the body includes first section and the second section of connecting in order, and the circulating valve cover is established in the junction of first section and second section, and all can dismantle the connection between first section, circulating valve and the second section.
Further, the horizontal well repeated fracturing tool further comprises a coupling positioner, and the coupling positioner is positioned on one side, deviating from the middle packer, of the slip packer.
Further, horizontal well repeated fracturing instrument still includes the float shoe, and the float shoe is located the one end that the body stretched into the pit shaft to can open or close the body.
Further, horizontal well repeated fracturing tool still includes the operation valve, and the operation valve is located the one side that middle part packer deviates from the top packer to with body intercommunication, the operation valve can control opening and closing of the operation mouth on the body.
Further, the operation valve is a one-way conduction valve, and the one-way conduction valve only allows fluid to enter the pipe body from the outside of the pipe body through the operation port.
Further, a service valve is located within the fracturing zone and proximate to the middle packer.
Furthermore, the middle packer and the slip packer are tension packers, and the top packer is a tension packer or a self-sealing packer.
According to another aspect of the invention, a horizontal well repeated fracturing process method is provided, wherein the horizontal well repeated fracturing tool is adopted, and the process method comprises the following steps: lowering a horizontal well repeated fracturing tool into a shaft, and enabling the perforation to be modified to be located in a fracturing area; lifting a pipe body of the horizontal well repeated fracturing tool, setting a slip packer of the horizontal well repeated fracturing tool, then continuously applying tension, and setting a top packer of the horizontal well repeated fracturing tool and a middle packer of the horizontal well repeated fracturing tool; introducing fracturing fluid into an annulus formed between the pipe body and the shaft, wherein the fracturing fluid sequentially enters a fracturing area between the middle packer and the slip packer through the annulus, an inlet on the pipe body, the pipe body and an outlet on the pipe body and acts on a perforation to be modified in the fracturing area; and after the repeated fracturing is finished, releasing the pipe body, lifting the horizontal well repeated fracturing tool to the next perforation to be reformed, and performing repeated fracturing operation again until all the perforations to be reformed are subjected to repeated fracturing.
Further, when the top packer, the middle packer and the slip packer are set, the circulating valve of the horizontal well repeated fracturing tool opens the inlet of the pipe body, and the fracturing sand blaster of the horizontal well repeated fracturing tool opens the outlet of the pipe body and blocks the pipe body.
Furthermore, after the horizontal well repeated fracturing tool is lowered into the shaft, well washing liquid is firstly introduced into the pipe body, the well washing liquid enters the annular space through the pipe body and the float shoe at the end part of the pipe body to be discharged out of the shaft, and then the slip packer is set.
Further, after all perforation repeated fracturing operations to be reformed are completed, the pipe body is released firstly, the top packer, the middle packer and the slip packer are enabled to be unsealed, then the horizontal well repeated fracturing tool is lifted to the vertical section of the shaft, the first section of the pipe body is detached, the second section of the pipe body is hung on the shaft, and production operations are carried out by opening the operation valve.
By applying the technical scheme of the invention, a fracturing area is formed by the middle packer and the slip packer, so that a perforation to be reformed and other perforations which do not need to be reformed or are reformed are separated from each other, an inlet and an outlet are formed on the pipe body, an annular space is formed between the pipe body and the shaft, and the top packer separates the perforation, so that fracturing fluid can be injected into the shaft through the annular space, enters the fracturing area through the inlet, the central cavity of the pipe body and the outlet and acts on the perforation to be reformed, and thus repeated fracturing operation is carried out on the perforation to be reformed. Because the fracturing fluid is introduced into the fracturing area through the annular space, the injection pressure of a wellhead can be effectively reduced, the injection construction displacement is greatly increased, the requirement of repeated reconstruction on a large scale is met, operation is carried out on the perforation to be reconstructed in the fracturing area, the reconstruction pertinence is strong, the reconstruction scale is large, and the reconstruction cost is low. In addition, owing to adopt slips packer, the slips assembly cooperation that utilizes slips packer to lift and the operation mode of release can realize top packer, middle part packer and slips packer three's setting and deblocking for the deblocking degree of difficulty is less, and convenient operation is swift.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural diagram of the horizontal well re-fracturing process of the present invention during well flushing;
FIG. 2 is a schematic structural diagram of the process of horizontal well re-fracturing in FIG. 1 during a re-fracturing operation; and
fig. 3 shows a structural schematic diagram of the process of horizontal well repeated fracturing in fig. 1 in normal production.
Wherein the figures include the following reference numerals:
10. a pipe body; 11. an annulus; 12. an inlet; 13. an outlet; 14. a first stage; 15. a second stage; 20. a top packer; 30. a middle packer; 40. a slip packer; 50. a circulation valve; 60. a fracturing sand blower; 70. a collar locator; 80. floating shoes; 90. a service valve; 100. a wellbore; 110. and (5) perforation reconstruction.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The invention provides a horizontal well repeated fracturing tool and a horizontal well repeated fracturing process method, and aims to solve the problem that a mechanical packing mode in the prior art cannot meet repeated fracturing requirements.
1-3, the horizontal well repeated fracturing tool comprises a pipe body 10, a top packer 20, a middle packer 30 and a slip packer 40, wherein an annular space 11 is formed between the pipe body 10 and a wellbore 100, and the side surface of the pipe body 10 is provided with an inlet 12 for flowing fracturing fluid and an outlet 13 for flowing fracturing fluid; top packer 20, middle part packer 30 and slips packer 40 are established in the body 10 outside along the direction that body 10 kept away from the well head at the interval cover in proper order, and top packer 20 is located the well head and is closest to between the perforation of well head, forms between middle part packer 30 and the slips packer 40 to be used for holding the fracturing region of waiting to reform transform perforation 110, and entry 12 is located between top packer 20 and the well head, and export 13 is located the fracturing region.
The embodiment forms a fracturing area through the middle packer 30 and the slip packer 40, so that the perforation 110 to be reformed is separated from other perforations which do not need to be reformed or are reformed, an annular space 11 is formed between the tubular body 10 and the shaft 100 by arranging the inlet 12 and the outlet 13 on the tubular body 10, the top packer 20 separates the perforations, so that fracturing fluid can be injected into the shaft 100 through the annular space 11, enters the fracturing area through the inlet 12, the central cavity of the tubular body 10 and the outlet 13 and acts on the perforation 110 to be reformed, and then the repeated fracturing operation is carried out on the perforation 110 to be reformed. Because the annular space 11 is led into fracturing fluid in to the fracturing zone, therefore can effectively reduce well head injection pressure, greatly increase and pour into the construction discharge capacity, satisfy the large-scale demand of repeated transformation to carry out the operation to waiting to transform perforation 110 in the fracturing zone, the transformation pertinence is strong, the transformation scale is big, the transformation cost is low. In addition, because the slip packer 40 is adopted, the setting and the unsetting of the top packer 20, the middle packer 30 and the slip packer 40 can be realized by utilizing the slip assembly of the slip packer 40 to cooperate with the lifting and releasing operation mode, so that the unsetting difficulty is small, and the operation is convenient and fast.
In this embodiment, the horizontal well re-fracturing tool further comprises a circulating valve 50 and a fracturing sand blaster 60, wherein the circulating valve 50 is positioned at the inlet 12 and used for controlling the opening and closing of the inlet 12, the circulating valve 50 controls the inlet 12 to be opened when the pipe body 10 is lifted up, and controls the inlet 12 to be closed when the pipe body 10 is released; the fracturing sand blaster 60 is located at the outlet 13 and used for controlling the opening and closing of the outlet 13, the fracturing sand blaster 60 controls the outlet 13 to be opened and the pipe body 10 to be plugged when the pipe body 10 is lifted up by the fracturing sand blaster 60, and the fracturing sand blaster 60 controls the outlet 13 to be closed and the pipe body 10 to be opened when the pipe body 10 is released. Thus, when the horizontal well repeated fracturing tool is lowered into the shaft 100 and the well washing process is carried out in the early stage, the inlet 12 and the outlet 13 are both closed, the well washing effect is ensured, only when the pipe body 10 is lifted up, along with the setting of the top packer 20, the middle packer 30 and the slip packer 40, the inlet 12 and the outlet 13 are both opened, and the fracturing fluid introduced from the annular space 11 can enter a fracturing area through the inlet 12, the central cavity of the pipe body 10 and the outlet 13.
In this embodiment, the pipe body 10 includes a first section 14 and a second section 15 connected in sequence, the circulation valve 50 is sleeved at the connection position of the first section 14 and the second section 15, and the first section 14, the circulation valve 50 and the second section 15 are detachably connected. The lower raise and release operations are performed by the first section 14 while setting and releasing the top packer 20, the middle packer 30, and the slip packer 40. And the arrangement of the first section 14 and the second section 15 enables the horizontal well repeated fracturing tool to be used for normal production after repeated fracturing operation is completed, on one hand, the pressure in the shaft 100 does not need to be processed, and the horizontal well repeated fracturing tool can be used for operation under pressure, on the other hand, the flow process of normal production operation is simplified, the time for replacing equipment is reduced, and the production efficiency is improved.
Optionally, horizontal well repeated fracturing tool still includes coupling locator 70, and coupling locator 70 is located slips packer 40 and deviates from one side of middle part packer 30, also is located the fracturing area outside, and coupling locator 70 can be when putting horizontal well repeated fracturing tool into pit shaft 100, fixes a position to the position of body 10, guarantees to put the position accuracy, can also carry out axial positioning to body 10 with, controls the distance between body 10 and the 100 inner walls of pit shaft, avoids the two condition such as collide.
In this embodiment, the horizontal well re-fracturing tool further comprises a service valve 90, the service valve 90 is located on a side of the middle packer 30 facing away from the top packer 20 and is in communication with the tubular body 10, and the service valve 90 is capable of controlling the opening and closing of a service port on the tubular body 10. The operation valve 90 is preferably an operation valve 90 with pressure, which can operate with pressure, the operation valve 90 is mainly used for normal production operation of the horizontal well repeated fracturing tool, specifically, when repeated fracturing operation is performed, the operation valve 90 is closed, it is ensured that fracturing fluid can only enter a fracturing area through a fracturing injector, after the repeated fracturing operation is completed, the horizontal well repeated fracturing tool is integrally lifted to a vertical section of a shaft 100, then the operation valve 90 is opened, and oil gas in the shaft 100 can enter a central cavity of the pipe body 10 through an operation opening to be exploited.
Preferably, the operation valve 90 is a one-way conduction valve, and the one-way conduction valve only allows fluid to enter the pipe body 10 from the outside of the pipe body 10 through the operation opening, so that reverse sealing can be realized, and the requirement of pressing the pipe body 10 under pressure is met.
In this embodiment, the service valve 90 is located within the fracture zone and near the middle packer 30, and more specifically, the service valve 90 is disposed between the fracturing sand jet 60 and the middle packer 30.
Preferably, the middle packer 30 and the slip packer 40 are tension packers, and the top packer 20 is a tension packer or a self-sealing packer, so that the problem of insufficient setting load caused by friction resistance of the horizontal section of the pipe body 10 can be avoided, and the applicable well depth range of the process is effectively expanded. Of course, other packers may be used as desired.
The structure of circulation valve 50 and fracturing sand blaster 60 of this embodiment is roughly the same, all include parts such as external joint, the nipple, a spring constitute, wherein part cover of nipple is established on the external joint and has axial slip between the two, the through-hole has been seted up to the nipple side, the through-hole on the circulation valve 50 is as entry 12, the through-hole on the fracturing sand blaster 60 is as export 13, the axial motion of external joint can shelter from or dodge the through-hole, thereby open or close the valve, the spring is then the initial condition of control flap, because circulation valve 50 and fracturing sand blaster 60 all its normally closed valve, therefore spring and nipple and external joint butt, and for the external joint provides the restoring force who shelters from the through-hole. The installation of the circulation valve 50 and the fracturing sand blaster 60 to the tubular body 10 can be in a manner of sectioning the tubular body 10, taking the circulation valve 50 as an example, as mentioned above, the circulation valve 50 is located at the junction of the first section 14 and the second section 15, that is, the first section 14 is connected with an outer joint, the second section 15 is connected with an inner joint, and the installation of the fracturing sand blaster 60 is basically similar. Thus, after the slip packer 40 is set, the pipe body 10 is lifted upwards to open the circulating valve 50 and the fracturing sand blaster 60, and when the pipe body 10 is released, the circulating valve 50 and the fracturing sand blaster 60 are automatically closed under the action of the spring.
Preferably, the rubber sleeve, slips, etc. of the slip packer 40 may be made of soluble materials.
The embodiment also provides a horizontal well repeated fracturing process method, which adopts the horizontal well repeated fracturing tool to operate and comprises the following steps:
lowering the assembled horizontal well repeated fracturing tool into a shaft 100, positioning and determining the lowering position of the pipe body 10 through a coupling positioner 70, so that the innermost perforation 110 to be modified in the shaft 100 is positioned in a fracturing area, the circulating valve 50, the fracturing sand blower 60 and the operation valve 90 are all in a closed state, the fracturing sand blower opens a central cavity of the pipe body 10, and the float shoe 80 is in an open state;
before the repeated fracturing operation is carried out, in order to avoid the influence of dirt in the shaft 100 on the operation, the well washing is firstly carried out, specifically, as shown in fig. 1, a well washing liquid is firstly introduced into the pipe body 10, and because the whole pipe body 10 is unblocked at the moment, the well washing liquid does not flow out of the circulating valve 50, the fracturing sand blaster 60 and the operation valve 90, but passes through the whole pipe body 10 and enters the annular space 11 through the floating shoes 80 at the end part of the pipe body 10, and is discharged out of the shaft 100 from the wellhead through the annular space 11. The well-flushing process can be repeated as many times as required;
after the well is washed, the slip packer 40 of the horizontal well repeated fracturing tool is set through operations of lifting, rotating the pipe body 10 and the like, as shown in fig. 2, then tension is continuously applied, so that the top packer 20 and the middle packer 30 are also set, in the process, the circulating valve 50 of the horizontal well repeated fracturing tool opens the inlet 12 of the pipe body 10, and the fracturing sand blaster 60 of the horizontal well repeated fracturing tool opens the outlet 13 of the pipe body 10 and blocks the pipe body 10;
after setting is completed, repeated fracturing operation can be performed, specifically, fracturing fluid is introduced into an annular space 11 formed between the pipe body 10 and the shaft 100, enters a fracturing area between the middle packer 30 and the slip packer 40 through the annular space 11, an inlet 12 on the pipe body 10, a central cavity of the pipe body 10 and an outlet 13 on the pipe body 10 in sequence, and acts on a perforation 110 to be reformed in the fracturing area, so that fracturing reformation is performed on the perforation 110 to be reformed;
as there may be multiple groups of perforations 110 to be reformed and may be distributed at different positions of the horizontal section in the wellbore 100, after the repeated fracturing operation of one perforation 110 to be reformed is completed, the tubular body 10 is released, the top packer 20, the middle packer 30 and the slip packer 40 are unset, and then the horizontal well repeated fracturing tool is lifted to the next perforation 110 to be reformed to perform the repeated fracturing operation again, and the steps are repeated until all the perforations 110 to be reformed are completed;
when the repeated fracturing of all the perforations 110 to be reformed is completed, the pipe body 10 is released, the top packer 20, the middle packer 30 and the slip packer 40 are all unsealed, then the horizontal well repeated fracturing tool is lifted to the vertical section of the shaft 100, the floating shoe 80 seals the end of the pipe body 10 at the moment, the first section 14 of the pipe body 10 is lifted out of the shaft mouth and is detached, the second section 15 of the pipe body 10 is hung on the shaft 100 through the oil pipe hanger, the process can be operated under pressure, an operating valve opening tool is put into the shaft mouth after the completion, and normal production operation can be carried out by opening the operating valve 90, as shown in fig. 3.
It should be noted that, a plurality in the above embodiments means at least two.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the problem that a mechanical packing mode in the prior art cannot meet the requirement of repeated fracturing is solved;
2. the injection pressure of a wellhead is effectively reduced, the injection construction displacement is greatly increased, and the requirement of repeated transformation on a large scale is met;
3. the improvement pertinence is strong, the improvement scale is large, and the improvement cost is low;
4. the unsealing difficulty is small, and the operation is convenient and quick;
5. the horizontal well repeated fracturing tool can also perform operation under pressure after the repeated fracturing operation is completed, and can be used for normal production;
6. the coupling positioner axially positions the pipe body, so that safety and accurate lowering position are ensured;
7. the tension packer can avoid the problem of insufficient setting load caused by friction resistance of the horizontal section of the pipe body, and effectively enlarges the applicable well depth range of the process.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A horizontal well re-fracturing tool, comprising:
the fracturing fluid flow device comprises a pipe body (10), wherein an annular space (11) is formed between the pipe body (10) and a shaft (100), and an inlet (12) for flowing in fracturing fluid and an outlet (13) for flowing out the fracturing fluid are arranged on the side surface of the pipe body (10);
a top packer (20);
a middle packer (30);
slip packer (40), top packer (20), middle part packer (30) and slip packer (40) are followed body (10) is kept away from the direction of well head and is established at the body (10) outside at intervals in proper order, top packer (20) are located the well head with be closest to between the perforation of well head, middle part packer (30) with form between slip packer (40) and be used for holding the fracturing region of waiting to reform transform perforation (110), entry (12) are located top packer (20) with between the well head, export (13) are located in the fracturing region.
2. The horizontal well re-fracturing tool of claim 1, further comprising:
a circulation valve (50), said circulation valve (50) being located at said inlet (12) and controlling said inlet (12) to open when said tube (10) is lifted and controlling said inlet (12) to close when said tube (10) is released;
the fracturing sand blaster (60) is located at the outlet (13), the fracturing sand blaster (60) controls the outlet (13) to be opened and blocks the pipe body (10) when the pipe body (10) is lifted, and the fracturing sand blaster (60) controls the outlet (13) to be closed and opens the pipe body (10) when the pipe body (10) is released.
3. The horizontal well re-fracturing tool according to claim 2, wherein the pipe body (10) comprises a first section (14) and a second section (15) which are connected in sequence, the circulating valve (50) is sleeved at the joint of the first section (14) and the second section (15), and the first section (14), the circulating valve (50) and the second section (15) are detachably connected.
4. The horizontal well re-fracturing tool of claim 1, further comprising a collar locator (70), the collar locator (70) being located on a side of the slip packer (40) facing away from the middle packer (30).
5. The horizontal well re-fracturing tool of claim 1, further comprising a float shoe (80), wherein the float shoe (80) is located at one end of the pipe body (10) extending into the wellbore (100) and is capable of opening or closing the pipe body (10).
6. Horizontal well re-fracturing tool according to claim 1, further comprising a service valve (90), said service valve (90) being located on the side of the middle packer (30) facing away from the top packer (20) and communicating with the tubular body (10), said service valve (90) being capable of controlling the opening and closing of a service port on the tubular body (10).
7. Horizontal well re-fracturing tool according to claim 6, wherein the service valve (90) is a one-way conduction valve and the one-way conduction valve only allows fluid from outside the tubular body (10) to enter into the tubular body (10) through the service port.
8. The horizontal well re-fracturing tool of claim 6, wherein the service valve (90) is located within the fracturing zone and proximate to the middle packer (30).
9. The horizontal well re-fracturing tool of claim 1 wherein the middle packer (30) and the slip packer (40) are tension packers and the top packer (20) is a tension packer or a self-sealing packer.
10. A process method for horizontal well repeated fracturing, which is characterized in that the horizontal well repeated fracturing tool of any one of claims 1 to 9 is adopted, and the process method comprises the following steps:
lowering the horizontal well re-fracturing tool into the wellbore (100) and locating the perforations (110) to be modified within a fracturing zone;
lifting a pipe body (10) of the horizontal well repeated fracturing tool and setting a slip packer (40) of the horizontal well repeated fracturing tool, then continuously applying tension, and setting a top packer (20) of the horizontal well repeated fracturing tool and a middle packer (30) of the horizontal well repeated fracturing tool;
introducing a fracturing fluid into an annular space (11) formed between the pipe body (10) and the shaft (100), wherein the fracturing fluid sequentially enters a fracturing area between the middle packer (30) and the slip packer (40) through the annular space (11), an inlet (12) on the pipe body (10), the pipe body (10) and an outlet (13) on the pipe body (10) and acts on a perforation (110) to be reformed in the fracturing area;
and after the repeated fracturing is completed, releasing the pipe body (10), lifting the horizontal well repeated fracturing tool to the next perforation (110) to be reformed, and performing repeated fracturing operation again until all the perforations (110) to be reformed are subjected to repeated fracturing.
11. A process according to claim 10, wherein, with the top packer (20), the middle packer (30) and the slip packer (40) set, the circulation valve (50) of the horizontal well re-fracturing tool opens the inlet (12) of the tubular body (10) and the frac blaster (60) of the horizontal well re-fracturing tool opens the outlet (13) of the tubular body (10) and blocks the tubular body (10).
12. The process according to claim 10, wherein after lowering the horizontal well re-fracturing tool into the wellbore (100), a flushing fluid is first introduced into the tubular body (10), the flushing fluid passes through the tubular body (10) and enters the annulus (11) from a float shoe (80) at the end of the tubular body (10) to drain the wellbore (100), and then the slip packer (40) is set.
13. The process of claim 10, wherein when all of the perforations (110) to be reformed are fractured repeatedly, the tubular body (10) is released and all of the top packer (20), the middle packer (30) and the slip packer (40) are unset, the horizontal well fracturing tool is then lifted up to the vertical section of the wellbore (100) and the first section (14) of the tubular body (10) is removed, the second section (15) of the tubular body (10) is hung on the wellbore (100), and production is performed by opening the operation valve (90).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010006130.1A CN110965978A (en) | 2020-01-03 | 2020-01-03 | Horizontal well repeated fracturing tool and horizontal well repeated fracturing process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010006130.1A CN110965978A (en) | 2020-01-03 | 2020-01-03 | Horizontal well repeated fracturing tool and horizontal well repeated fracturing process method |
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| CN110965978A true CN110965978A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010006130.1A Pending CN110965978A (en) | 2020-01-03 | 2020-01-03 | Horizontal well repeated fracturing tool and horizontal well repeated fracturing process method |
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