CN114427423A - Multi-cluster balanced extension device and use method thereof - Google Patents
Multi-cluster balanced extension device and use method thereof Download PDFInfo
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
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- 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
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention provides a multi-cluster balanced extension device and a using method thereof, belonging to the technical field of oil-gas well development and comprising the following steps: the device comprises a cylindrical body, wherein the upper end and the lower end of the body are connected with a casing string; the convex edges are axially arranged on the outer wall of the body, and a plurality of fracturing holes are formed in the convex edges; wherein the fracturing holes are holes subjected to strengthening treatment. The invention realizes the uniform extension of each cluster of cracks in the staged fracturing section of the horizontal well, forms a complex crack network, improves the volume of fracturing modification, reduces the occurrence of casing deformation, reduces the development cost and improves the staged fracturing development effect of the horizontal well.
Description
Technical Field
The invention relates to a multi-cluster balanced extension device, which is suitable for staged fracturing operation of a horizontal well and belongs to the technical field of oil-gas well development. The invention also relates to a using method of the multi-cluster balanced extension device
Background
At present, the horizontal well staged multi-cluster fracturing technology is popularized and applied in a large scale, and plays an important role in increasing, storing and increasing production in exploration and development of oil and gas reservoirs with different lithologies. The mechanism of action is based on segmentation, and each segment of cracks forms a complex seam network. Whether complex seam networks can be formed or not depends mainly on the fact that the difference value of the induced stress interference effect among all the clusters of cracks in the section exceeds the original horizontal stress difference value. The premise is that the length extension degree of the cracks of each cluster is basically equivalent, and if the length difference of the cracks of each cluster is large, the induced stress interference effect among the cracks is greatly reduced, so that the complexity of the cracks in the section and the modification volume are greatly reduced. In addition, after a large amount of fracturing fluid and proppant enters only a small amount of fractures, the induced stress of the fractures is too large and may be transmitted to the fractures of the lower section further, which may result in the fracture extension of the lower section near the toe being suppressed. Therefore, the interval between sections is increased to make the lower section crack farther away, which reduces the utilization rate of the horizontal well section, especially reduces the yield greatly after the gas-containing place is abandoned. Furthermore, a small number of fractures absorb most of the fracturing fluid and proppant resulting in a greater local stress concentration effect that causes plastic deformation of the casing in the vicinity of the fracture. Therefore, the uneven extension of the multi-cluster cracks in the section has a great disadvantage. Moreover, the phenomenon of unbalanced extension of multiple clusters of cracks in a section is very common, and a large amount of overseas monitoring data proves that the maximum crack length of 6 clusters of perforation cracks is more than 6 times of the minimum crack length. The domestic physical simulation result of the initiation and propagation of the double-cluster cracks also proves that 50% of the cases are the initiation of the single-cluster cracks, and the balanced extension of the double-cluster initiated cracks only accounts for 14%.
The previous measures for promoting the balanced extension of the multiple-cluster cracks mainly comprise variable-parameter perforation, temporary plugging ball use and the like. But the variable parameter perforation has great uncertainty, and the extension degree of each cluster of cracks is not clear; the temporary plugging ball is adopted to plug the shot hole, and the migration track of the temporary plugging ball is asynchronous with the fracturing fluid because the density of the temporary plugging ball is much higher than that of the fracturing fluid (more than 1.3-1.7g/cm3, and the fracturing fluid is generally 1.01-1.03g/cm3) at present. For example, if a certain cluster of cracks near the root needs to be plugged to a large extent, but the flow inertia is large due to the high density of the temporary plugging balls, it migrates more toward the crack near the toe. Resulting in the desired plugging of the heel cleft without plugging. Particularly, because the density of the temporary plugging balls is high, the holes at the top of the horizontal shaft can not be plugged in a certain cluster of cracks to be plugged, and the holes can be quickly separated from the holes at the top even if the holes are plugged. This results in a partial increase in wellbore pressure due to the temporary plugging, which promotes the migration and distribution of more fracturing fluid and proppant into the previously more extensive fractures, and instead exacerbates the imbalance in the propagation of the multiple clusters of fractures.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a multi-cluster balanced extension device and a use method thereof, which can be used for realizing the uniform extension of all clusters of cracks in a staged fracturing section of a horizontal well, forming a complex fracture network, improving the volume of fracturing modification, reducing the occurrence of casing deformation, reducing the development cost and improving the staged fracturing development effect of the horizontal well.
In one aspect of the present invention, a multi-cluster balanced extension apparatus is provided, including:
the device comprises a cylindrical body, wherein the upper end and the lower end of the body are connected with a casing string; and
the plurality of ribs are axially arranged on the outer wall of the body, and a plurality of fracturing holes are formed in the ribs;
wherein the fracturing holes are holes subjected to strengthening treatment.
A further development of the invention is that the fracturing holes are arranged radially on the body and are arranged in rows uniformly along the ridge.
A further improvement of the invention is that the fracturing perforations comprise right angle perforations or inverted circular arc perforations.
A further improvement of the invention is that the fracturing perforations are provided in the upper part of the body; the body is internally provided with a sliding sleeve, and the sliding sleeve is positioned at the upper part of the body and blocks the fracturing hole in an initial state; after the preset position is reached, the sliding sleeve moves to the lower part of the body under the action of an opening tool, and the fracturing hole is opened.
The invention has the further improvement that the sliding sleeves in the body are one group or a plurality of groups, and one group of sliding sleeves is a plurality of ball passing sliding sleeves and a bottom ball stopping sliding sleeve; the multiunit the sliding sleeve includes that a plurality of groups cross the ball sliding sleeve and set up the ball sliding sleeve that ends at every group bottommost.
The invention is further improved in that the sliding sleeve is a ball passing sliding sleeve, a ball passing seat is arranged at the lower end of the ball passing sliding sleeve, and the ball passing seat comprises a plurality of claw sheets matched with the opening tool.
The invention is further improved in that the sliding sleeve is a ball stopping sliding sleeve, a ball stopping seat is arranged at the lower end of the ball stopping sliding sleeve, and a step matched with the opening tool is arranged on the ball stopping seat.
The invention is further improved in that a plurality of sealing rings are arranged on the outer wall of the sliding sleeve, and in an initial state, the sealing rings seal gaps between the sliding sleeve and the body, which are positioned above and below the fracturing hole.
In another aspect of the present invention, a method for using a multi-cluster balanced extension apparatus is also provided, including:
firstly, evaluating reservoir parameters of a horizontal well and determining a partial pressure interval, so that the opening pressure and the extension pressure of each cluster are consistent with the fracturing gradient data of a shaft, and obtaining the fracturing hole parameter requirements of each cluster;
determining the number and size of fracturing holes, the size of a hole transition arc and the arrangement mode of the holes of the multi-cluster balanced extension device of each layer section;
and processing and assembling the cluster balanced extension device, and performing fracturing operation.
The invention is further improved in that the construction pressure of each cluster is calculated according to the extension pressure and the pipe column depth of each cluster, and the flow rate of the fracturing holes is calculated according to the construction pressure.
Compared with the prior art, the invention has the advantages that:
the invention discloses a multi-cluster balanced extension device and a using method thereof. The uniform cracking and the balanced extension of each cluster of perforation in the section can be realized, the volume of staged fracturing transformation is greatly improved, and the deformation after the casing fracturing is avoided. The multi-cluster balanced extension device is different according to the number of holes, the size of the holes, the shape of the holes and the arrangement scheme required by fracturing design of each cluster in a section, and differential design of the balanced extension devices of each cluster is realized. The multi-cluster balanced extension device provided by the invention has the advantages that the holes are all subjected to strengthening treatment, the sand adding requirement is met, and the formation and balanced extension of each cluster of cracks in the section are facilitated. The method has clear principle, completely meets the fracturing optimization design requirement, and can improve the fracturing development effect of the horizontal well.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic top view of a multi-cluster equalizer extension apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1 showing the configuration of five sets of fins;
FIG. 3 is a schematic cross-sectional view of FIG. 1 showing the configuration of six sets of fins;
FIG. 4 is a schematic top view of a multiple cluster equalizer extension apparatus according to one embodiment of the present invention, showing the fracturing tree in a closed position with a ball-in-place sleeve configuration;
FIG. 5 is a schematic top view of a multiple cluster equalizer extension apparatus according to one embodiment of the present invention, showing the fracturing ports in an open position with a ball-passing sleeve configuration;
FIG. 6 is a schematic cross-sectional view of FIG. 4;
FIG. 7 is a schematic top view of a multiple cluster equalizer extension apparatus according to one embodiment of the present invention, showing the fracturing tree in a closed position with a ball stop sleeve configuration;
FIG. 8 is a schematic top view of a multiple cluster equalizer extension apparatus according to one embodiment of the present invention, showing the fracturing ports in an open position with a ball stop sleeve configuration;
FIG. 9 is a schematic cross-sectional view of FIG. 7;
FIG. 10 is a graphical illustration of size calculation parameters for a fracturing aperture in an embodiment of the present invention;
FIG. 11 illustrates an embodiment of the present invention showing the automatic annular seal device with an average slot width after use;
FIG. 12 illustrates SRV data after use of an automatic annulus seal apparatus according to an embodiment of the present invention;
in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
The meaning of the reference symbols in the drawings is as follows: 1. the body, 2, bead, 3, fracturing hole, 4, cross the ball sliding sleeve, 5, end ball sliding sleeve, 6, top connection, 7, lower clutch. 8. Right angle eyelet, 9, inverted arc eyelet, 10 and sealing ring.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically shows a multi-cluster balanced extension device according to one embodiment of the invention, comprising a cylindrical body 1, an upper joint 6 is arranged at the upper end of the body 1, a lower joint 7 is arranged at the lower end, and the upper joint 6 and the lower joint 7 are both provided with casing buckles for connecting casing strings. The outer wall of the body 1 is provided with a plurality of rows of convex edges 2, and the convex edges 2 are provided with a plurality of fracturing holes 3.
The convex edge 2 is arranged on the body 1, so that the thickness of the body 1 is far greater than the wall thickness of a casing, and the strength of the body 1 is far greater than the extrusion resistance strength of a common casing after perforation, so that the plastic deformation of the casing caused by re-fracturing of the common casing can be avoided, and the inner drift diameter of the casing after fracturing can be maintained.
In the present embodiment, the fracture hole 3 is a reinforced hole. The strengthening treatment mode comprises the following two modes: firstly, the direct strengthening process is to process the holes on the body 1 according to the hole distribution scheme, and then adopt the strengthening treatment scheme on the inner walls of the holes to strengthen the wear resistance of the holes so as to meet the design requirements. Preferably, laser strengthening can be used to change the surface strength, or a wear-resistant coating can be applied on the surface. Secondly, the body 1 processes out female hole according to the cloth hole scheme, and the wear-resisting cover that makes wear-resisting material is embedded into female hole again, and wear resistance of wear-resisting cover satisfies the designing requirement.
In the conventional perforation technology at present, the perforation wall is a conventional casing steel pipe, and the perforation aperture is gradually increased along with the continuous increase of sand addition in the fracturing sand addition process. And the fracture with large extension degree has more entering propping agents, so the effect on hole polishing and hole expanding is more obvious, the fracture entering resistance is smaller and smaller, and further more entering fracturing fluid and propping agents are obtained. Therefore, the uneven extension degree of each cluster of cracks caused by the increasing pore diameter of the overflowing holes in the fracturing process is prevented. The fracturing holes 3 in the embodiment are strengthened, so that the hole diameter of the fracturing holes is basically not changed due to the fact that the fracturing holes enter the propping agent in the fracturing process, and therefore the balanced extension among multiple clusters of fractures is promoted to a great extent.
In one embodiment, the fracturing orifices 3 are radially disposed on the body 1 and arranged in a row along the rib 2. In this embodiment, the number of ribs 2 may be five (as shown in fig. 2), six (as shown in fig. 3), or other numbers.
In one embodiment, as shown in fig. 2, the fracturing perforation 3 comprises a right-angle perforation 8 or a round-arc perforation 9, the inner side edge of the inner wall of the right-angle perforation 8 is a right-angle side, and the inner side edge of the inner wall of the round-arc perforation is a round-angle. Furthermore, the fracturing holes 3 may also be tapered holes. When the diameter of the hole is small, the body 1 is directly processed into a right-angle hole 8; when the diameter of the hole is larger, the hole is an embedding hole and is an inverted arc hole 9.
In one embodiment, the fracturing perforations 3 are provided in the upper part of the ridge 2. The inside of body 1 is provided with the sliding sleeve, and the sliding sleeve is located at initial state the upper portion of body 1, at this moment, the sliding sleeve is in the closed position to can block fracturing hole 3. When the multi-cluster balanced extension device is lowered to a preset position along with the casing, the sliding sleeve slides to the lower part of the body 1, so that the fracturing hole 3 in the upper part of the body 1 is exposed and is located at an open position, and then fracturing operation can be carried out.
In one embodiment, the sliding sleeves in the body 1 are one or more groups, one group of sliding sleeves includes a plurality of ball passing sliding sleeves 4 and a ball stopping sliding sleeve 5 arranged at the bottom, and each group of sliding sleeves includes a plurality of ball passing sliding sleeves 4 and a ball stopping sliding sleeve 5 arranged at the bottom. A set of sliding sleeve is constituteed with ending the ball seat sliding sleeve to several ball seat sliding sleeves and is used, several fracturing of clustering promptly, like one section 4 clusters, this moment, uses 3 ball sliding sleeves 4 and one end ball sliding sleeve 5 of crossing. The first section of a string is opened with a delay without a ball-throwing sliding sleeve.
In one embodiment, as shown in fig. 4, 5 and 6, the sliding sleeve is a ball passing sliding sleeve 4, and the lower end of the ball passing sliding sleeve 4 is provided with a ball passing seat. The tee can receive an opening tool. The opening tool is preferably a sealing ball in this embodiment. In this embodiment, the tee seat includes a plurality of claws, as shown in fig. 4, after the sealing ball falls into the tee seat, the sealing ball is clamped on the tee seat, and the pressure above the tee seat is increased, so as to push the sliding sleeve to move downwards. When the sliding sleeve is moved to the bottom end of the body 1, as shown in fig. 5, the fracturing holes 3 in the upper portion of the body 1 are opened, thereby performing fracturing. When the pressure is increased to a certain value, the claw piece of the ball passing seat is opened, and the sealing ball slides out of the ball passing seat, so that the full drift diameter is realized.
In another embodiment, as shown in fig. 7, 8 and 9, the sliding sleeve is a ball stopping sliding sleeve 5, the lower end of the ball stopping sliding sleeve 5 is provided with a ball stopping seat, and the ball stopping seat is provided with a step for receiving an opening tool. The opening tool is preferably a sealing ball in this embodiment. The sealing ball is clamped on the ball stopping seat after falling into the position of the ball stopping seat, the pressure above the ball stopping seat is increased, and the sliding sleeve is pushed to move downwards as shown in figure 7. When the sliding sleeve is moved to the bottom end of the body 1, as shown in fig. 8, the fracturing holes 3 in the upper portion of the body 1 are opened, thereby performing fracturing.
In one embodiment, a plurality of sealing rings 10 are arranged on the outer side of the sliding sleeve. In the initial state, the sliding sleeve is in the closed position, and the sealing ring 10 seals the gap between the sliding sleeve and the body 1 and seals the upper side and the lower side of the fracturing hole 3.
The diameters of perforation holes are difficult to keep consistent after conventional casing well cementation, the shapes of the perforation holes are difficult to form standard geometric shapes, and the sizes and the shapes of the perforation holes can be greatly changed by grinding a propping agent in the fracturing process, so that the balanced extension among multiple clusters of fractures is influenced. In the horizontal well multi-cluster balanced extension device according to the embodiment, the fracturing holes 3 are consistent in geometric dimension and standard in geometric shape, and the hole walls are subjected to wear-resistant processing. The prior art can lead the sand passing amount of each hole to reach 10m3-15m3The sand is not expanded basically, which meets the current single cluster (10 meshes) sand adding scale (100 m)3-150m3) The requirements of (1). Therefore, the wear resistance of the wall of the hole can meet the design requirement by the wear resistance treatment.
During manufacturing, a sliding sleeve structure is arranged inside the multi-cluster balanced extension device, paraffin or lubricating grease is filled into each hole after the sliding sleeve is installed and a test is completed, and the paraffin or the lubricating grease is packed after the paraffin or the lubricating grease is wrapped outside the holes. The multi-cluster balanced extension device finished product of the embodiment is connected into a casing string according to the sectional fracturing design requirement of a horizontal well, and enters the well together to perform normal well cementation operation. In order to realize synchronous initiation and synchronous extension of multiple clusters of cracks in each section, multiple clusters of balanced extension devices are installed in each section, the diameter, the number and the arrangement form of holes of each device are subjected to detailed simulation design according to geological data, then a specific scheme is given, and customized processing, assembly, testing and coding are carried out in a factory according to the requirements of the design scheme, and then packaging and transportation are carried out to the site.
According to another aspect of the present embodiment, a fracturing method is further provided, where the method is implemented by the horizontal well multi-cluster balanced extension device according to the above embodiments, and includes the following steps:
firstly, evaluating reservoir parameters of a horizontal well and determining a partial pressure interval, so that the opening pressure and the extension pressure of each cluster are consistent with the fracturing gradient data of a shaft, and obtaining the fracturing hole parameter requirements of each cluster;
determining the number and size of the fracturing holes 3 of the multi-cluster balanced extension device of each layer section, the size of a hole transition arc and the arrangement mode of the holes;
and processing and assembling the cluster balanced extension device, and performing fracturing operation.
In a particular embodiment, the method comprises the following steps:
step one, evaluating reservoir parameters of a horizontal well.
The horizontal well reservoir parameters comprise longitudinal and transverse distribution characteristics, lithology, whole rock mineral components, physical properties, rock mechanics parameters, three-dimensional ground stress characteristics, natural fracture state, spatial distribution, temperature, pressure and the like of the horizontal well reservoir. The method can be comprehensively applied to determination of earthquake, well logging, indoor core testing and the like.
And step two, determining the partial pressure layer section.
For the development of a horizontal well, the horizontal well section is longer, and the construction is generally carried out in a sectional multi-cluster fracturing combined mode. Under the condition, the pressure distribution along the horizontal well section presents gradient distribution along the track of the well bore, the pressure at the perforating holes of each cluster from the target point a to the target point b changes from large to small, the stratum opening pressure of each hole cluster is simulated according to the calculation result, and the opening pressure and the extension pressure of each cluster are consistent with the fracturing gradient data of the well bore by calculating the stratum stress and optimizing the perforating parameters, so that the fracturing hole parameter requirement of each cluster is obtained.
And step three, optimizing design of the cluster equilibrium extension device.
And on the basis of the second step, common eyelet friction resistance parameter optimization simulation software is applied to establish a fine eyelet model, and particularly the number and the size of eyelets, the sizes of eyelet transition arcs and the eyelet arrangement mode are clearly described. And performing matching fitting of the perforation and stratum fracture initiation, fracture extension and the like, thereby determining key parameter information such as the number and the size of the fracturing perforations 3 of each cluster of balanced extension devices of each layer section, the size of a transition arc of the perforation, the arrangement and the arrangement mode of the perforation and the like. Each section corresponds to a specific design scheme.
And calculating the construction pressure of each cluster according to the extension pressure and the pipe column depth of each cluster, calculating the flow of the fracturing holes 3 according to the construction pressure, and calculating the size of fracture tightness.
For example, as shown in FIG. 10, four clusters are formed, and the extension pressure P of each cluster is calculatedc1、Pc2、Pc3、Pc4(ii) a Calculating the construction pressure P in each cluster of point pipes according to the parameters of the depth, the construction displacement and the like of the pipe columnf1、Pf2、Pf3、Pf4. Calculated according to the following equation: pf1＝Pk1+Pc1；Pf2＝Pk2+Pc2；Pf3＝Pk3+Pc3；Pf4＝Pk4+Pc4；Pf1＝△P1+Pf2；Pf1＝△P2+Pf3；Pf1＝△P3+Pf4。
According to the flow and the P of each holek1、Pk2、Pk3、Pk4The size of each cluster of holes is matched.
And step four, processing and assembling the cluster balanced extension device.
And (4) processing and manufacturing the balanced extension device of each section of the horizontal well according to the parameters determined in the third step, assembling and coding numbers, wherein the numbers are consistent with the clusters of each section in the fracturing design. And (4) transporting the manufactured balanced extension devices of all the sections to a construction site after error detection, and sequentially entering a well and performing well cementation and fracturing operation according to a construction sequence.
And processing and assembling the multi-cluster balanced extension device in a factory workshop according to the specific fracturing design of a specific well according to the design requirement. And machining and installing the fracturing holes of each multi-cluster balanced extension device, and assembling the fracturing holes which are matched with different numbers and different sizes and have different structures according to different requirements of each cluster of each section. In order to ensure the construction quality, each set of multi-cluster balanced extension device is verified and numbered in a factory, and the well is assembled and put into the well according to the design requirements on the site. Therefore, the fracturing holes can be guaranteed to meet the fracturing design requirements to the maximum extent, uniform complex fracturing cracks can be generated, the fracturing volume is increased, and the fracturing effect is improved.
The invention is applied to a shale gas well in the Sichuan basin. According to reservoir parameters, firstly, designing segmentation and fracturing hole parameters according to the implementation step two; according to a segmentation scheme, a software optimization is adopted to determine that the number of fracturing perforations 3 of a fracturing section is 48 and 56, the perforation aperture is 9.5-13.9mm, the perforation mode adopts spiral perforation and plane perforation, specific parameters are determined through related calculation according to the reservoir condition of each fracturing section, and the optimization premise is that the opening pressure and the extension pressure of each cluster are consistent with the wellbore fracturing gradient data.
The analysis after the fracturing shows that the advantageous seam width of each fracturing section is reduced (figure 11), namely the phenomenon of non-uniform expansion of each cluster of cracks is obviously weakened, the SRV is obviously increased (figure 12) after the device is adopted, and the device plays a role in promoting multi-cluster balanced extension.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A multi-cluster equal extension device, comprising:
the device comprises a cylindrical body, wherein the upper end and the lower end of the body are connected with a casing string; and
the plurality of ribs are axially arranged on the outer wall of the body, and a plurality of fracturing holes are formed in the ribs;
wherein the fracturing holes are holes subjected to strengthening treatment.
2. The multi-cluster equal extension device of claim 1, wherein the fracturing apertures are radially disposed on the body and are uniformly arranged in rows along the ribs.
3. The multi-cluster equi-elongation device of claim 2, wherein the fracturing perforations comprise right angle perforations or inverted circular arc perforations.
4. A multi-cluster isostatic extension device according to any one of claims 1-3, wherein said fracturing perforations are provided in an upper portion of said body; the body is internally provided with a sliding sleeve, and the sliding sleeve is positioned at the upper part of the body and blocks the fracturing hole in an initial state; after the preset position is reached, the sliding sleeve moves to the lower part of the body under the action of an opening tool, and the fracturing hole is opened.
5. The multi-cluster balanced extension device of claim 4, wherein the sliding sleeves in the body are one or more sets, and one set of sliding sleeves is a plurality of ball-passing sliding sleeves plus one bottom ball-stopping sliding sleeve; the multiunit the sliding sleeve includes that a plurality of groups cross the ball sliding sleeve and set up the ball sliding sleeve that ends at every group bottommost.
6. The multi-cluster balanced extension device according to claim 4 or 5, characterized in that the sliding sleeve is a ball-passing sliding sleeve, the lower end of the ball-passing sliding sleeve is provided with a ball-passing seat, and the ball-passing seat comprises a plurality of claws which are matched with the opening tool.
7. The multi-cluster balanced extension device according to claim 4 or 5, wherein the sliding sleeve is a ball stopping sliding sleeve, the lower end of the ball stopping sliding sleeve is provided with a ball stopping seat, and the ball stopping seat is provided with a step matched with the opening tool.
8. The multi-cluster balanced extension device according to any one of claims 4 to 7, wherein the sliding sleeve is provided with sealing rings on its outer wall, which in an initial state seal the gap between the sliding sleeve and the body above and below the fracturing hole.
9. A method of using a multi-cluster equal extension device according to any one of claims 1 to 8, comprising:
firstly, evaluating reservoir parameters of a horizontal well and determining a partial pressure interval, so that the opening pressure and the extension pressure of each cluster are consistent with the fracturing gradient data of a shaft, and obtaining the fracturing hole parameter requirements of each cluster;
determining the number and size of fracturing holes, the size of a hole transition arc and the arrangement mode of the holes of the multi-cluster balanced extension device of each layer section;
and processing and assembling the cluster balanced extension device, and performing fracturing operation.
10. The use method according to claim 9, wherein the construction pressure of each cluster is calculated from the extension pressure and the pipe column depth of each cluster, and the flow rate of the fracturing hole is calculated from the construction pressure.
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