CN112160736A - Non-throttling sand blasting sliding sleeve - Google Patents
Non-throttling sand blasting sliding sleeve Download PDFInfo
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- CN112160736A CN112160736A CN202010961331.7A CN202010961331A CN112160736A CN 112160736 A CN112160736 A CN 112160736A CN 202010961331 A CN202010961331 A CN 202010961331A CN 112160736 A CN112160736 A CN 112160736A
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- 238000005488 sandblasting Methods 0.000 title claims abstract description 129
- 230000004323 axial length Effects 0.000 claims abstract description 17
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005270 abrasive blasting Methods 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000012530 fluid Substances 0.000 abstract description 7
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 38
- 230000000295 complement effect Effects 0.000 description 12
- 238000010276 construction Methods 0.000 description 12
- 239000004576 sand Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002904 solvent 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
- 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
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a non-throttling sand blasting sliding sleeve which comprises a non-throttling inner sliding sleeve, a sand blasting sliding sleeve main body and a soluble ball, wherein the non-throttling inner sliding sleeve comprises an outer cylinder and an inner cylinder, the axial length of the inner cylinder is smaller than that of the outer cylinder, the inner cylinder is sleeved and arranged on the inner side of the bottom end of the outer cylinder in a clearance mode, and the inner cylinder and the outer cylinder are connected into a whole through a connecting part; the sand blasting sliding sleeve main body is a cylinder body with a plurality of sand blasting holes formed on the side wall of the upper part, and the inner wall of the lower part of the sand blasting sliding sleeve main body is provided with a circle of limiting steps with the inner diameter slightly larger than the outer diameter of the inner cylinder; the soluble ball is used for plugging the inner barrel; the non-throttling inner sliding sleeve is fixed in the sand blasting sliding sleeve main body through a plurality of shearing pins and seals the sand blasting holes; the axial length from the top surface of the non-throttling inner sliding sleeve to the lower side hole wall of the sand blasting hole is less than or equal to the axial length from the bottom surface of the non-throttling inner sliding sleeve to the upper end surface of the limiting step; the throttling-free sand blasting sliding sleeve can realize the functions of no throttling of a sand blasting hole and use of multi-stage separate-layer fracturing, reduce the erosion damage of fracturing fluid to the sand blasting hole and a production casing pipe, and improve the safety of a fracturing pipe column and the production casing pipe.
Description
Technical Field
The invention relates to the technical field of fracturing operation of oil and gas fields, in particular to a non-throttling sand blasting sliding sleeve.
Background
In recent years, with the continuous deepening of the development of domestic oil and gas fields, the 'K344 packer + sand blasting sliding sleeve' layered fracturing technology becomes a main technology for improving the single-well yield of the oil and gas fields. According to the technology, interlayer isolation of a fracturing layer section is realized through a K344 packer, a communication channel between a fracturing string and a reservoir is established through a sand blasting sliding sleeve, and the purposes of completing multi-stage layered fracturing and solving production of a combined layer by running a string once can be realized. Among them, the sand-blasting sliding sleeve is an important tool for realizing the technology.
The structure design of the existing sand blasting sliding sleeve is a mode of opening a stepped ball seat and throttling a sand blasting hole by throwing balls, and the structure design not only can meet the requirement of multi-stage layered fracturing, but also can ensure the setting and sealing reliability of a K344 packer in fracturing construction; however, in a large number of field constructions, the structure has a plurality of defects, which restrict the further popularization and application of the structure, such as: (1) along with the increase of the number of stages of the separate-layer fracturing, the aperture of the sand blasting sliding sleeve ball seat is gradually reduced from top to bottom, the inner diameter of the fracturing pipe column is correspondingly gradually reduced, accumulated throttling is formed in the pipe column, the friction resistance of fracturing fluid in the fracturing pipe column is increased, and the pumping pressure of a wellhead is improved; (2) in order to ensure the setting of the K344 packer, throttling is generated by reducing a sand-blasting hole, so that the construction discharge capacity is limited, the sand conveying efficiency is reduced, the flow rate of fracturing fluid passing through the sand-blasting hole is increased, the abrasion of the sand-blasting hole is intensified, meanwhile, the back-splash generated by high-flow-rate fracturing fluid can generate serious erosion damage to the sand-blasting hole and a production casing, accidents such as fracturing pipe column fracture, production casing deformation and the like can be possibly caused, and great risk is brought to subsequent shaft operation; (3) the design of this structure leads to in the fracturing string and the cumulative throttling effect of sandblast hole department to increase along with the increase of layering progression, and fracturing fluid rubs and hinders also corresponding increase, has not only restricted construction discharge capacity, sand addition volume and construction scale, has increased the well head pump pressure moreover, has sacrificed operating efficiency, can not satisfy the problem that extensive fracturing construction needs.
Disclosure of Invention
The invention aims to provide a non-throttling sand blasting sliding sleeve which solves the problems that in a multi-stage separate-layer fracturing string, the accumulated throttling effect is formed in the fracturing string due to the fact that the aperture of a conventional sand blasting sliding sleeve ball seat is reduced along with the increase of the number of stages of separate-layer fracturing from top to bottom, the existing structure cannot meet the requirement of large-scale fracturing construction, and the like.
Therefore, the technical scheme of the invention is as follows:
a meterless sandblasting sleeve comprising:
the sand blasting sliding sleeve main body is of a cylinder structure, a plurality of sand blasting holes are uniformly distributed on the side wall of the upper part of the sand blasting sliding sleeve main body along the circumferential direction, and a circle of limiting step is formed on the inner wall of the lower part of the sand blasting sliding sleeve main body in a protruding manner;
the inner sleeve without throttling comprises an outer sleeve and an inner sleeve, wherein the axial length of the inner sleeve is smaller than that of the outer sleeve, the inner sleeve is sleeved and arranged on the inner side of the bottom end of the outer sleeve in a clearance mode, and the inner sleeve and the outer sleeve are connected into a whole through a connecting part;
the diameter of the soluble ball is matched with the inner diameter of the inner barrel so as to effectively plug the inner barrel;
the inner throttling sliding sleeve is sleeved on the inner side of the sand blasting sliding sleeve main body, is fixed on the inner wall of the sand blasting sliding sleeve main body through a plurality of shearing pins which are uniformly arranged along the circumferential direction, and seals each sand blasting hole formed in the sand blasting sliding sleeve main body; the axial length from the top surface of the non-throttling inner sliding sleeve to the lower side hole wall of the sand blasting hole is less than or equal to the axial length from the bottom surface of the non-throttling inner sliding sleeve to the upper end surface of the limiting step; the outer diameter of the inner cylinder is slightly smaller than the inner diameter of the position of the limit step.
Furthermore, the connecting part is a cylindrical body with a sector-shaped radial section, and the axial length of the connecting part is consistent with that of the inner cylinder.
Further, the radial cross-sectional area of the connecting portion is 1/4 of the radial cross-sectional area of the annular passage formed between the outer and inner cylinders.
Furthermore, the sand blasting holes are axial long holes, and the total flow area of all the sand blasting holes is 1.5 times of the flow area of the oil pipe.
Furthermore, at least two groups of O-shaped sealing rings are respectively arranged on the outer wall of the outer barrel of the non-throttling inner sliding sleeve and positioned on two sides of the sand blasting hole.
Furthermore, there is the top connection at sandblast sliding sleeve main part top threaded connection, and is equipped with on the top inner wall of top connection and connects the internal thread.
Furthermore, a connecting external thread is arranged on the outer wall of the bottom end of the sand blasting sliding sleeve main body.
Compared with the prior art, this no throttle sandblast sliding sleeve's beneficial effect lies in:
(1) the throttling-free sand blasting sliding sleeve keeps the function that the conventional sand blasting sliding sleeve can realize the use of multi-stage separate-layer fracturing, and structurally, a unique double-layer flow passage structure is designed, namely an inner-layer ball seat passage and an outer-layer flow complementary passage, and flow complementation is formed through the difference of flow areas of the two passages, so that the total flow areas are approximately the same and are larger than the flow area of an oil pipe, and the defect of accumulated throttling caused by the gradual reduction of the ball seat aperture from top to bottom along with the increase of the number of the separate-layer stages in a fracturing string is overcome;
(3) the total overflowing area of all sand-blasting holes of the throttling-free sand-blasting sliding sleeve is designed to be 1.5 times of the overflowing area of an oil pipe, so that the sand-blasting holes are not throttled, the erosion damage of fracturing fluid to the sand-blasting holes and a production casing is reduced, and the safety of a fracturing pipe column and the production casing is improved;
(4) when the non-throttling sand blasting sliding sleeve is used on a multi-stage separate-layer fracturing string, as the non-throttling inner sliding sleeve and the sand blasting hole are not throttled, the over-flow and the over-flow speed are almost close to the full diameter of an oil pipe, the flow limitation is avoided, the sand conveying efficiency and the safety of fracturing construction are improved, and the requirement of large-scale fracturing construction can be met;
(5) this no throttle sandblast sliding sleeve is in the back of the operating condition of bowling, and outer complementary passageway of flow forms hydraulic pressure conduction passageway with sandblast sliding sleeve main part, walks around the hydraulic pressure of upper strata soluble ball conduction to the lower floor and need hydraulic no throttle in the self-service deblocking packer, has guaranteed the normal work of fracturing string.
Drawings
Fig. 1(a) is a structural schematic diagram of an initial state of the non-throttle sand blasting sliding sleeve of the invention;
FIG. 1(b) is a cross-sectional view A-A of FIG. 1 (a);
fig. 2(a) is a schematic structural diagram of the non-throttle sand blasting sliding sleeve after ball throwing;
FIG. 2(B) is a cross-sectional view B-B of FIG. 2 (a);
fig. 3(a) is a structural schematic view of the non-throttle sand-blasting sliding sleeve in a working state after ball throwing;
FIG. 3(b) is a cross-sectional view C-C of FIG. 3 (a);
fig. 4 is a schematic structural view of a fracturing string formed by the non-throttling sand blasting sliding sleeve of the invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
As shown in fig. 1(a) and 1(b), the choke-free sandblaster slide sleeve comprises an upper joint 1, a choke-free inner slide sleeve 5, a sandblast slide sleeve body 6 and a soluble ball 7.
The inner sleeve 5 without throttling comprises an outer sleeve and an inner sleeve, the axial length of the inner sleeve is smaller than that of the outer sleeve, the inner sleeve is arranged on the inner side of the bottom end of the outer sleeve in a centered mode with a gap, and the inner sleeve and the outer sleeve are connected into a whole through a connecting part; the structure of the inner sliding sleeve 5 without throttling is characterized in that the lower part of the inner sliding sleeve is a double-layer flow passage structure, the inner sliding sleeve comprises an inner-layer ball seat passage formed on the basis of an inner cylinder and an outer-layer flow complementary passage formed on the basis of an annular space between an outer cylinder and the inner cylinder, and the two passages together form a flow passage.
The diameter of the soluble ball 7 is adapted to the inner diameter of the inner cylinder, so that the inner cylinder is effectively blocked by putting the soluble ball 7 into the sliding sleeve.
As another preferable technical solution of this embodiment, the top surface of the inner cylinder is processed into a tapered surface, so that it forms a ball seat structure, and further forms a surface seal in cooperation with the soluble ball 7.
As another preferable technical solution of this embodiment, the connecting portion is a cylindrical body having a sector-shaped radial cross section, and an axial length thereof is identical to an axial length of the inner cylinder; the radial cross-sectional area of the joint is 1/4 the radial cross-sectional area of the annular channel formed between the outer and inner barrels.
The sand blasting sliding sleeve main body 6 is of a cylinder structure, four sand blasting holes are uniformly distributed on the side wall of the upper part of the sand blasting sliding sleeve main body along the circumferential direction, and a circle of limiting step is formed on the inner wall of the lower part of the sand blasting sliding sleeve main body in a protruding manner; the four blasting holes are preferably axially long holes.
As a preferable technical scheme of this embodiment, the flow area of all the sand blasting holes is 1.5 times of the flow area of the oil pipe, so that the sand blasting holes do not have the throttling problem, and the erosion damage of the fracturing fluid to the sand blasting holes and the production casing is reduced.
The non-throttling inner sliding sleeve 5 is sleeved on the inner side of the sand blasting sliding sleeve main body 6 and is fixed on the inner wall of the sand blasting sliding sleeve main body 6 through a plurality of shearing pins 3 which are uniformly arranged along the circumferential direction and seal each sand blasting hole formed on the sand blasting sliding sleeve main body 6, so that the sand blasting hole is opened and closed through the non-throttling inner sliding sleeve 5; the number and the diameter of the shear pins 3 meet the design values of shearing pressure, so that the sand blasting holes are opened in a pressure controllable mode; meanwhile, in order to ensure that the sand blasting hole can be completely sealed by the non-throttling inner sliding sleeve 5 initially, two first O-shaped sealing rings 2 and two second O-shaped sealing rings 4 are respectively arranged on the outer wall of the outer barrel of the non-throttling inner sliding sleeve 5 and positioned at two sides of the sand blasting hole; the axial length from the top surface of the non-throttling inner sliding sleeve 5 to the lower side hole wall of the sand blasting hole is equal to the axial length from the bottom surface of the non-throttling inner sliding sleeve 5 to the upper end surface of the limiting step, so that after the shearing pin 3 is sheared, the non-throttling inner sliding sleeve 5 moves downwards to the limiting step and exposes all the sand blasting holes; as shown in fig. 3(a) and 3(b), in addition, the inner diameter of the position of the limiting step is slightly larger than the outer diameter of the inner barrel, so that after the non-throttling inner sliding sleeve 5 falls to the position of the limiting step, the overflowing channel is almost completely closed, but an annular overflowing channel is still left between the inner barrel and the sand blasting sliding sleeve body 6 and used for overflowing to the position of a lower packer to keep the packer in a setting state all the time.
The upper joint 1 is threaded at the top end of the sand blasting sliding sleeve main body 6, and a sealing ring is arranged at the threaded connection end; the inner wall of the top end of the upper joint 1 is provided with a connecting internal thread, and the outer wall of the bottom end of the sand blasting sliding sleeve main body 6 is provided with a connecting external thread.
Example 2
FIG. 4 shows a seven-stage laminated fractured string formed using the meterless grit-blasted slip sleeve of example 1 to meet the 7-stage fracture in a 5-1/2 "production casing; in particular, the amount of the solvent to be used,
the seven-stage laminated fracturing string comprises a bell mouth A, a non-throttling self-deblocking packer B, a first-stage non-throttling sand blasting sliding sleeve C, a non-throttling self-deblocking packer B, a second-stage non-throttling sand blasting sliding sleeve D, a non-throttling self-deblocking packer B, a third-stage non-throttling sand blasting sliding sleeve E, a non-throttling self-deblocking packer B, a fourth-stage non-throttling sand blasting sliding sleeve F, a non-throttling self-deblocking packer B, a fifth-stage non-throttling sand blasting sliding sleeve G, a non-throttling self-deblocking packer B, a sixth-stage non-throttling sand blasting sliding sleeve H, a non-throttling self-deblocking packer B, a sand-prevention hydraulic anchor I and a hydraulic safety joint J which are sequentially connected from bottom to top; the bell mouth A, the sand control hydraulic anchor I, the hydraulic safety joint J, the oil pipe K and the production casing L are commercially available well completion common accessories, and each non-throttling self-service unsetting packer B adopts a product disclosed in a patent CN 109538182A.
In the seven-stage laminated cracking tubular column, the inner diameter of the outer cylinder of the inner sliding sleeve without throttling in the inner sliding sleeve without throttling sand blasting at each stage is kept consistent with the wall thickness of the inner cylinder, the inner diameter of the inner cylinder is gradually increased from bottom to top, namely the flow area of a channel of the ball seat at the inner layer is gradually increased, correspondingly, the diameter of a soluble ball matched with the sliding sleeve without throttling sand blasting at each stage is also gradually increased from bottom to top along with the change of the inner diameter of the inner cylinder; the inner diameter of the outer cylinder is kept unchanged, so that the flow area of the outer-layer flow complementary channel is gradually reduced from bottom to top; furthermore, the flow area of the inner ball seat passage and the flow area of the outer flow complementary passage are balanced to form flow complementation, so that the total flow areas of the inner ball seat passage and the outer flow complementary passage are kept approximately the same, and the advantage that no throttling is generated in the fracturing string is realized.
During construction, the seven-stage laminated fracturing string is lowered into a production casing L, and the sand blasting holes of each stage of the non-throttling sand blasting sliding sleeve correspond to the positions of reservoir sections in an oil and gas well, namely a bell mouth is positioned above a first fracturing reservoir layer section, the sand blasting holes of the first stage of the non-throttling sand blasting sliding sleeve correspond to the positions of second fracturing reservoir layer sections, the sand blasting holes of the second stage of the non-throttling sand blasting sliding sleeve correspond to the positions of third fracturing reservoir layer sections, the sand blasting holes of the third stage of the non-throttling sand blasting sliding sleeve correspond to the positions of fourth fracturing reservoir layer sections, the sand blasting holes of the fourth stage of the non-throttling sand blasting sliding sleeve correspond to the positions of fifth fracturing reservoir layer sections, the sand blasting holes of the fifth stage of the non-throttling sand blasting sliding sleeve correspond to the positions of sixth fracturing reservoir layer sections, and the sand blasting holes of the sixth stage of the non-throttling sand blasting sliding sleeve correspond to the positions of the seventh fracturing reservoir; the integral pipe column is fixed in the production casing by setting seven non-throttling self-service deblocking packers B. When a certain stage of the throttling-free inner sliding sleeve is in a ball throwing working state, the inner ball seat channel is closed, the outer layer flow complementary channel is almost closed along with the falling of the throttling-free inner sliding sleeve, the sand blasting hole becomes a main hydraulic transmission channel, and meanwhile, the hydraulic pressure of the upper layer is transmitted to the lower layer of the throttling-free self-service deblocking packer needing hydraulic pressure by bypassing the soluble ball from an annular gap left between the inner cylinder and the limiting step, so that the packer is always kept in a setting state.
The operating principle of the sliding sleeve of the non-throttling sand blaster is as follows:
as shown in fig. 1(a) and 1(b), the throttle-free inner sliding sleeve of the throttle-free sand blower sliding sleeve is a double-layer flow passage structure and comprises an inner-layer ball seat passage and an outer-layer flow complementary passage; the inner ball seat channel is a conical ball injection hole; after a plurality of throttling-free sand blasters are assembled to form a multi-stage fracturing string, the inner diameter of an inner-layer ball seat channel is gradually reduced from top to bottom along with the increase of the stage number of the layered fracturing, and meanwhile, the flow area of an outer-layer flow complementary channel is gradually increased from top to bottom along with the increase of the stage number of the layered fracturing, namely, when the flow area of the inner-layer ball seat channel is reduced, the flow area of the outer-layer flow complementary channel is increased, and flow complementation is formed through the length of the flow areas of the two channels, so that the total flow areas are approximately the same;
as shown in fig. 2(a) and 2(b), when a non-throttling sand-blasting sliding sleeve with corresponding stages is needed, a soluble ball matched with the non-throttling sand-blasting sliding sleeve is thrown in, and a channel of an inner ball seat is blocked, at the moment, high-pressure liquid pumped from the ground can only flow into a lower space through an outer-layer flow complementary channel, as the total flow area channel after the ball is thrown is reduced, the liquid flowing downwards is subjected to larger resistance of the non-throttling inner sliding sleeve, and as the force action is mutual, the liquid flowing downwards also forms corresponding impact force on the non-throttling inner sliding sleeve;
as shown in fig. 3(a) and 3(b), when the impact force reaches the shear force value of the shear pin, the shear pin is sheared, the non-throttling inner sliding sleeve descends to expose the sand blasting hole, and fracturing of the corresponding interval is performed through the sand blasting hole; at the moment, the outer-layer flow complementary channel is almost closed, the lower-layer section is plugged, only small annular space is reserved for conducting hydraulic pressure to the lower-layer throttling-free self-service deblocking packer needing hydraulic pressure, the packer is kept in a setting state, and normal work of the fracturing string is guaranteed.
In this embodiment 2, in each of the stages of the seven-stage laminated fractured tubular column, the maximum flow diameter (outer cylinder inner diameter), the second flow diameter (inner cylinder outer diameter) and the minimum flow diameter (inner cylinder inner diameter) of the inner sleeve 5 are expressed by Dmax、Dnext、DminShowing, wherein, the inner diameter D of the outer cylindermaxIs 80mm, DminMatching the diameter of the soluble ball 7, Dnext＝Dmin+10. When the three sizes are positioned in the first stage of the non-throttling sand blasting sliding sleeve in the fracturing string, the three sizes are called as D1-max、D1-next、D1-min(ii) a When the second-stage non-throttling sand blasting sliding sleeve is positioned, the second-stage non-throttling sand blasting sliding sleeve is called D2-max、D2-next、D2-min(ii) a Similarly, when the sliding sleeve is positioned at the sixth stage and is not subjected to throttling sand blasting, the sliding sleeve is called D6-max、D6-next、D6-min。
Specifically, in the seven-stage laminated cracking tubular column, the diameters of the soluble balls 7 of each stage of the non-throttling sand-blasting sliding sleeve are 28.5mm, 31.5mm, 34.5mm, 37.5mm, 40.5mm and 43.5mm from bottom to top; the inner diameter of the corresponding inner cylinder is 26mm, 29mm, 32mm, 35mm, 38mm and 41 mm; the outer diameters of the corresponding inner cylinders are 36mm, 39mm, 42mm, 45mm, 48mm and 51 mm;
based on this, calculate the area of overflowing of every grade of no throttle sandblast sliding sleeve in proper order and be:
the total flow area of the first-stage non-throttling sand blasting sliding sleeve is as follows:
S1＝3.14*{3*(D1-max 2-D1-next 2)/4+D1-min 2)}/4≈3536mm2；
the total flow area of the second-stage non-throttling sand blasting sliding sleeve is as follows:
S2＝3.14*{3*(D2-max 2-D2-next 2)/4+D2-min 2)}/4≈3533mm2；
……
the total flow area of the sixth-stage non-throttling sand blasting sliding sleeve is as follows:
S6＝3.14*{3*(D6-max 2-D6-next 2)/4+D6-min 2)}/4≈3556mm2。
wherein, the internal drift diameter of the 2-7/8' oil pipe adopted by the fracturing string is 62mm, and the through-flow area is calculated to be 3017mm2. Based on the above calculation results, it can be determined that: the theoretical flow area of each stage of the throttling-free sand blasting sliding sleeve is larger than that of the fracturing string, and then the theoretical flow area can be deduced: the throttling-free sand blasting sliding sleeve does not generate throttling when being used in a fracturing string, so that the over-flow and the over-flow speed are almost close to the full drift diameter of a 2-7/8' oil pipe, the flow limitation is avoided, the sand conveying efficiency and the fracturing construction safety are obviously improved, and the requirement of large-scale fracturing construction can be met.
The non-throttling sand blasting sliding sleeve not only reserves the advantage that the conventional throttling sand blasting sliding sleeve can realize multi-stage separate-layer fracturing, but also structurally overcomes the defect of layer-by-layer throttling at the throttling and sand blasting holes in the fracturing string, so that high-pressure sand carrying liquid flows smoothly in the fracturing string, and meanwhile, as the overflowing amount in the fracturing string is unchanged, the overflowing area of the non-throttling sand blasting sliding sleeve is increased, the liquid flow speed is reduced, the liquid friction resistance is reduced, and the tool protection is facilitated.
It is to be noted and understood that various modifications and improvements can be made to the invention described in detail above without departing from the spirit and scope of the invention as claimed in the appended claims. Accordingly, the scope of the claimed subject matter is not limited by any of the specific exemplary teachings provided.
Claims (7)
1. The utility model provides a no throttle sandblast sliding sleeve which characterized in that includes:
the inner sliding sleeve (5) without throttling comprises an outer cylinder and an inner cylinder, the axial length of the inner cylinder is smaller than that of the outer cylinder, the inner cylinder is sleeved and arranged on the inner side of the bottom end of the outer cylinder in a clearance mode, and the inner cylinder and the outer cylinder are connected into a whole through a connecting part;
the sand blasting sliding sleeve main body (6) is of a cylinder structure, a plurality of sand blasting holes are uniformly distributed on the side wall of the upper part of the sand blasting sliding sleeve main body along the circumferential direction, and a circle of limiting steps are formed on the inner wall of the lower part of the sand blasting sliding sleeve main body in a protruding mode;
and a soluble ball (7) with a diameter adapted to the inner diameter of the inner barrel to effectively plug the inner barrel;
the inner throttling sliding sleeve (5) is sleeved and fixed on the inner side of the sand blasting sliding sleeve main body (6) through a plurality of shearing pins (3) which are uniformly arranged along the circumferential direction, and each sand blasting hole formed in the sand blasting sliding sleeve main body (6) is sealed; the axial length from the top surface of the non-throttling inner sliding sleeve (5) to the lower side hole wall of the sand blasting hole is less than or equal to the axial length from the bottom surface of the non-throttling inner sliding sleeve (5) to the upper end surface of the limiting step; the outer diameter of the inner cylinder is slightly smaller than the inner diameter of the position of the limit step.
2. The meterless sandblasting slip sleeve of claim 1 wherein the coupling portion is a cylindrical body having a sector-shaped radial cross-section and an axial length corresponding to an axial length of the inner barrel.
3. The meterless sandblasting slip sleeve of claim 2 wherein the radial cross-sectional area of the joint is 1/4 times the radial cross-sectional area of the annular channel formed between the outer barrel and the inner barrel.
4. The meterless abrasive blasting sliding sleeve of claim 1 wherein the abrasive blasting holes are axially elongated holes and the total flow area of all the abrasive blasting holes is 1.5 times the flow area of the oil pipe.
5. The non-throttling sand blasting sliding sleeve as claimed in claim 1, wherein at least two sets of O-shaped sealing rings are respectively arranged on the outer wall of the outer cylinder of the non-throttling inner sliding sleeve (5) and positioned at two sides of the sand blasting hole.
6. The throttling-free sand blasting sliding sleeve as claimed in claim 1, wherein the upper joint (1) is connected to the top end of the sand blasting sliding sleeve main body (6) in a threaded sealing manner, and the inner wall of the top end of the upper joint (1) is provided with a connecting internal thread.
7. The non-throttling sand blasting sliding sleeve as recited in claim 1, wherein a connecting external thread is arranged on the outer wall of the bottom end of the sand blasting sliding sleeve main body (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010961331.7A CN112160736A (en) | 2020-09-14 | 2020-09-14 | Non-throttling sand blasting sliding sleeve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010961331.7A CN112160736A (en) | 2020-09-14 | 2020-09-14 | Non-throttling sand blasting sliding sleeve |
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| CN112160736A true CN112160736A (en) | 2021-01-01 |
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| CN202010961331.7A Withdrawn CN112160736A (en) | 2020-09-14 | 2020-09-14 | Non-throttling sand blasting sliding sleeve |
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