CN114427419B - Stage fracturing completion string for unlimited full-drift-diameter oil and gas well - Google Patents
Stage fracturing completion string for unlimited full-drift-diameter oil and gas well Download PDFInfo
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- CN114427419B CN114427419B CN202011019326.0A CN202011019326A CN114427419B CN 114427419 B CN114427419 B CN 114427419B CN 202011019326 A CN202011019326 A CN 202011019326A CN 114427419 B CN114427419 B CN 114427419B
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- 238000007789 sealing Methods 0.000 claims description 42
- 238000004080 punching Methods 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims 3
- 230000013011 mating Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 24
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000037237 body shape Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses an infinite stage full-diameter oil-gas well staged fracturing completion pipe string, which is characterized in that a stage cementing device, an expansion type open hole packer, a compression type open hole packer, a differential pressure sliding sleeve and a uniflow valve are connected in the completion pipe string from top to bottom through a sleeve, the staged fracturing sliding sleeve corresponding to a fracturing layer is connected between the expansion type open hole packer and the differential pressure sliding sleeve through the sleeve, and the fracturing layer is sealed and isolated through the compression type open hole packer. The invention utilizes the staged fracturing sliding sleeve to adjust the setting parameters of the password slot to finish the coding in each fracturing layer in the well completion string, thereby realizing the fracturing construction. The well completion pipe string has the advantages of simple structure, reliable operation and strong operability, the inner diameters of the sectional fracturing sliding sleeves are uniform, and the special switch tool after construction can be fished out uniformly at one time, so that the full drift diameter of the well completion pipe string is realized.
Description
Technical Field
The invention relates to the field of oil extraction engineering of oil and gas wells in the petroleum industry, in particular to an unlimited stage full-drift diameter oil and gas well staged fracturing completion pipe column.
Background
At present, most of domestic oil fields enter the later development stage, main force blocks are developed, and the left unexplored blocks are difficult to use. The low-permeability reservoir is a main direction of stable and guaranteed production of the current oil field due to high development difficulty and high reserve, wherein the larger the scale of fracturing is, the more the reservoir layers are pressed open, and the better the reservoir reconstruction effect is. The fracturing sliding sleeve in the well completion string is a core tool for multistage staged fracturing construction, and is a key point for influencing the staged number of fracturing of the oil and gas reservoirs.
The existing mature layering fracturing technology is generally divided into the following three types:
the first is mainly a mode of opening the sliding sleeve by throwing balls, such as a method for staged fracturing of a horizontal well open hole of patent number 201711166392.9, and a method for further improving the throwing ball efficiency of patent number 201810574098. X. At present, the technical principle of the common ball throwing sliding sleeve in China is classified ball throwing, so that no matter how the ball throwing sliding sleeve is improved, the ball throwing sliding sleeve is limited by the number of level difference layers, the number of achievable levels is limited, the number of segments is limited, and the technical requirement of infinite levels cannot be met. The number of areas where cracks do not pass is large, and waste in resource development exists; the technology of pumping bridge plug, oil connection dragging fracturing and the like adopted abroad can meet the stage number requirements of segmentation, but has the defects of discontinuous fracturing construction, long operation time, pipe column operation requirement and the like. Thus leading to the development of technology development to the direction of the unfractionated full-bore fracturing sliding sleeve.
The second is to put into the prefabricated sliding sleeve of service tool tubular column switch to break through the restriction of the number of stages, for example patent No. 201710653410. X @ a stepless drag fracturing process and fracturing tool string in the sleeve and @ open hole staged fracturing completion tubular column and hydraulic control switch tubular column of setting controllable valve @ of patent No. 201110291724.2 @, but because the fracturing sliding sleeve switch must be implemented by the service tubular column, the characteristics of complicated process, long construction period, large risk and the like cannot be avoided.
The third is the full-drift diameter infinite stage-division fracturing technology developed gradually in recent years, and the main advantage of the full-drift diameter infinite stage-division fracturing technology is that a sliding sleeve switch can realize infinite stage-division and stage-division fracturing without an internal service pipe column, and the full-drift diameter can meet the channel requirement required by large-displacement fracturing. For example, the patent number 201710023475.6 is a full-drift diameter multistage key switch-type fracturing sliding sleeve, but the later-stage process of the input key is complicated because the input key needs to be processed, the period is long, and other well completion accidents are easy to occur.
In summary, the full-diameter infinite-stage casing fracturing is more and more important because of the characteristics of the full-diameter infinite-stage casing fracturing, but the existing completion pipe string for realizing the full-diameter infinite-stage casing fracturing also has the problems of complex process, higher cost, longer construction time consumption and unfavorable popularization and application under low oil price, and the problems of the oil-gas well staged fracturing completion pipe string are urgently needed to be solved.
Disclosure of Invention
In order to solve the problems of complex construction process, long construction period and easy occurrence of faults of the existing staged fracturing string of the oil and gas well, the staged fracturing completion string of the oil and gas well with the unlimited stage and full drift diameter is provided, so that the staged fracturing connected therein has the advantages of simple structure, reliable work, convenient operation, shortened construction operation period and reduced production cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the staged fracturing well completion pipe string of the oil and gas well with the unlimited full-diameter is connected with a staged cementing device, an expansion type open hole packer, a compression type open hole packer, a differential pressure sliding sleeve and a single flow valve from top to bottom through a sleeve, the staged fracturing sliding sleeve corresponding to a fracturing layer is connected between the expansion type open hole packer and the differential pressure sliding sleeve through the sleeve, and the fracturing layers are sealed by the compression type open hole packer;
the staged fracturing sliding sleeve is provided with an outer cylinder and an inner cylinder, a fracturing hole is formed in the outer cylinder, a pawl is arranged on the upper body of the inner cylinder, a password groove is formed in the inner wall of the middle part of the inner cylinder, an inner cylinder lock ring limiting step is arranged on the outer wall of the lower part of the inner cylinder, a lower baffle ring is connected with the lower end of the inner cylinder, and an inner cylinder lock ring is arranged between the inner cylinder lock ring limiting step and the lower baffle ring;
the inner wall of the outer barrel is provided with an upper baffle ring limiting sealing step, a pawl locking groove, a fracturing Kong Guan closed groove and a fracturing hole punching groove, and a drainage hole is also arranged in the outer barrel between the upper baffle ring limiting sealing step and the pawl locking groove;
the upper joint of the outer cylinder is connected with the upper part of the outer cylinder, and the lower part of the inner cylinder is positioned between the outer cylinder and the lower joint after the lower joint is connected with the outer cylinder;
the inner cylinder is arranged in the outer cylinder, a pawl at the upper part of the inner cylinder is clamped in a pawl locking groove of the outer cylinder, and an inner cylinder locking ring is clamped between the inner cylinder and a fracturing hole closing groove; the upper baffle ring is connected with the upper lock cylinder and then arranged above an upper baffle ring limiting sealing step in the outer cylinder, and a reset spring is also arranged between the upper lock cylinder and the upper baffle ring limiting sealing step, and the pawl is clamped by the upper lock cylinder;
the minimum internal diameter of the staged fracturing sliding sleeve of the oil and gas well after being assembled is consistent with the internal diameter of the well completion string.
The fracturing hole is arranged in the outer barrel between the pawl locking groove and the fracturing hole closing groove.
The distance between the fracturing Kong Guan closed groove and the fracturing hole open groove in the outer barrel is consistent with the distance between the upper end of the pawl and the hole wall at the lower end of the fracturing hole.
The outer circle of the locking cylinder is a non-constant diameter outer circle, the outer circle of the middle part of the locking cylinder is provided with a reset spring limiting sealing step, a pawl locking cylinder is arranged below the reset spring limiting sealing step, and the outer diameter of the pawl locking cylinder is consistent with the inner diameter of a pawl.
An upper lock cylinder upper sealing groove and an upper lock cylinder lower sealing groove are respectively arranged in the upper outer circle of the upper lock cylinder and the reset spring limit sealing step, and sealing elements are respectively arranged in the upper lock cylinder sealing groove and the lower lock cylinder sealing groove; and the outer circle of the lower end of the pawl lock cylinder is provided with a chamfer.
The pawl at the upper part of the inner cylinder is provided with at least three pawls, the pawl hook at the upper end of the pawl faces outwards, and the external shape of the pawl hook is consistent with the internal shape of the pawl locking groove.
And an inner cylinder sealing groove is arranged in the outer wall of the inner cylinder below the pawl and corresponds to the positions above and below the fracturing holes in the outer cylinder, and a sealing piece is arranged in the inner cylinder sealing groove.
The inner cylinder lock ring is an unclosed annular cylinder body, and an obliquely arranged butt joint edge is arranged in the annular cylinder body.
The outer diameter of the upper part of the lower joint is consistent with the inner diameter of the lower part of the inner cylinder, the inner cylinder can axially slide in a ring space formed between the outer circle of the upper part of the lower joint and the outer cylinder, the outer circle of the middle part of the lower joint is provided with an outer cylinder buckling step, and the outer circle of the upper part of the outer cylinder buckling step is provided with a connecting thread connected with the outer cylinder; and a lower joint drainage hole is arranged in the body of the lower joint above the upper buckling step of the outer barrel.
The staged fracturing sliding sleeve can be connected in a well completion pipe column corresponding to a fracturing layer section through an upper connector and a lower connector, the number of the password slots or the shapes of the slots in each staged fracturing sliding sleeve connected in the well completion pipe column are different, and the setting parameters of the password slots can be adjusted according to actual well conditions.
Compared with the existing staged fracturing completion pipe string, the staged fracturing completion pipe string has the following remarkable use effects and advantages:
as a core tool for multistage staged fracturing construction, the staged fracturing sliding sleeve has simple structure,
the full-diameter, unlimited-stage and selective staged fracturing functions are realized in the completion string by connecting staged fracturing sliding sleeves with different groups of password slots or different sizes or different structures or password slots with different groups, sizes and structures in the completion string and corresponding to different fracturing layers. The staged fracturing slide of different fracturing layers in the well completion string is a special switching tool which is put into different but corresponding to the password slot of the staged fracturing slide through the running string or pumping down, and the staged fracturing slide corresponding to the fracturing layer is sequentially opened from bottom to top and is subjected to fracturing construction. The special switch tool after the sliding sleeve is opened can be left in the shaft, and is uniformly fished out after the fracturing construction of all layers is completed. The entering mode of the special switch tool can be flexibly adjusted, the aim of reducing cost and enhancing efficiency can be achieved, and the special switch tool has the specific advantages that:
(1) The invention utilizes the staged fracturing sliding sleeve to adjust the size, distance and quantity of the password grooves and the geometric shape of the cross section of the groove body to finish the encoding in each fracturing layer in the well completion pipe string, realizes the fracturing construction, and the password blocks in the special switching device are in one-to-one correspondence with the password grooves of the staged fracturing sliding sleeve, so that the staged fracturing sliding sleeves in other fracturing layers can not be staggered or wrongly opened.
(2) The well completion pipe string has the advantages of simple structure, reliable operation and strong operability, the inner diameters of the sectional fracturing sliding sleeves are uniform, and the special switch tool after construction can be fished out uniformly at one time, so that the full drift diameter of the well completion pipe string is realized.
(3) The segmented fracturing sliding sleeve has strong universality, and the special switching tool matched with the segmented fracturing sliding sleeve can be used for entering a well from a tubular column by adopting a mechanical device or can be used for entering the well by adopting a hydraulic device through pumping, so that the segmented fracturing sliding sleeve can be opened, the construction mode is flexibly selected, the construction period and the cost are conveniently controlled, and the segmented fracturing sliding sleeve has a remarkable use effect.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the staged fracturing sleeve of fig. 1.
Fig. 3 is a schematic structural view of the outer tub of fig. 2.
Fig. 4 is a schematic view of the structure of the locking cylinder of fig. 2.
FIG. 5 is a schematic view of the inner barrel of FIG. 2.
FIG. 6 is a schematic view of the lower lock ring of the inner barrel of FIG. 2.
Fig. 7 is a schematic view of the structure of the lower joint in fig. 2.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 7, an infinite stage full-diameter oil and gas well staged fracturing completion string is formed by connecting a staged cementing device 02, an expanded open hole packer 03, a compressed open hole packer 04, a differential pressure sliding sleeve 05 and a single flow valve 06 from top to bottom through a sleeve 01, wherein the staged fracturing sliding sleeve corresponding to a fracturing horizon is connected between the expanded open hole packer 03 and the differential pressure sliding sleeve 05 through the sleeve 01, and the fracturing horizons are sealed by the compressed open hole packer 04;
the staged fracturing sliding sleeve is provided with an outer cylinder 2 and an inner cylinder 5, a fracturing hole 204 is formed in the outer cylinder 2, a pawl 501 is arranged on the upper body of the inner cylinder 5, a coded slot 503 is formed in the inner wall of the middle part, an inner cylinder lock ring limiting step 504 is arranged on the outer wall of the lower part, a lower baffle ring 7 is connected with the lower end of the inner cylinder 5, and an inner cylinder lock ring 6 is arranged between the inner cylinder lock ring limiting step 504 and the lower baffle ring 7;
the inner wall of the outer cylinder 2 is provided with an upper baffle ring limit sealing step 201, a pawl locking groove 203, a fracturing hole closing groove 205 and a fracturing hole punching groove 206, a drain hole 202 is also arranged in the outer cylinder 2 between the upper baffle ring limit sealing step 201 and the pawl locking groove 203, and part of liquid can flow out of the operation pipe column from the drain hole 202 in the process of punching the hydraulic pressure on the ground to push up the locking cylinder 4;
the upper joint 1 of the outer cylinder is connected with the upper part of the outer cylinder 2, and after the lower joint 8 is connected with the outer cylinder 2, the lower part of the inner cylinder 5 is positioned between the outer cylinder 2 and the lower joint 8;
the inner cylinder 5 is arranged in the outer cylinder 2, a pawl 501 at the upper part of the inner cylinder 5 is clamped in a pawl locking groove 203 of the outer cylinder 2, and an inner cylinder locking ring 6 is clamped between the inner cylinder 5 and a fracturing hole closing groove 205; the upper baffle ring 3 is connected with the upper lock cylinder 4 and then is arranged above the upper baffle ring limiting sealing step 201 in the outer cylinder 2, and a reset spring 9 is also arranged between the upper lock cylinder 4 and the upper baffle ring limiting sealing step 201, and the pawl 501 is clamped by the upper lock cylinder 4;
the minimum internal diameter of the staged fracturing sliding sleeve of the oil and gas well after being assembled is consistent with the internal diameter of the well completion string.
On the basis of the first embodiment, the present invention also has the following embodiments:
the fracturing hole 204 is arranged in the outer cylinder 2 between the pawl lock groove 203 and the fracturing hole closing groove 205.
The distance between the fracturing hole closing groove 205 and the fracturing hole opening groove 206 in the outer barrel 2 is consistent with the distance between the upper end of the pawl 501 and the hole wall at the lower end of the fracturing hole 204, so that the fracturing hole 204 in the outer barrel 2 is fully opened and is not shielded by the inner barrel 5 after the inner barrel 5 is pushed down by a special switch tool for staged fracturing sliding sleeve.
The outer circle of the locking cylinder 4 is a non-constant diameter outer circle, the middle outer circle of the locking cylinder 4 is provided with a reset spring limit sealing step 402, a pawl locking cylinder 404 is arranged below the reset spring limit sealing step 402, and the outer diameter of the pawl locking cylinder 404 is consistent with the inner diameter of the pawl 501, so that the pawl locking cylinder 404 can be installed in the pawl 501.
An upper lock cylinder upper sealing groove 401 and an upper lock cylinder lower sealing groove 403 are respectively arranged in the upper outer circle of the upper lock cylinder 4 and the reset spring limit sealing step 402, and sealing elements are respectively arranged in the upper lock cylinder sealing groove 401 and the upper lock cylinder lower sealing groove 403; the lower outer circumference of the pawl lock cylinder 404 is provided with a chamfer. The chamfer can facilitate loading of pawl lock cylinder 404 into pawl 501. The upper seal groove 401 and the lower seal groove 403 of the upper lock cylinder can provide a seal for the drain hole 202, preventing well fluid outside the operation string from entering between the upper lock cylinder 4 and the outer cylinder 2.
At least three pawls 501 are provided on the upper portion of the inner cylinder 5, and the outer shape of the pawl is matched with the inner shape of the pawl lock groove 203.
An inner cylinder seal groove 502 is provided in the outer wall of the inner cylinder 5 below the pawl 501 and at positions corresponding to the upper and lower sides of the fracturing hole 204 in the outer cylinder 2, and a seal is provided in the inner cylinder seal groove 502. The inner barrel seal groove 502 is filled with a seal to prevent well fluid from entering between the outer barrel 2 and the inner barrel 5 from the fracturing port 204.
The inner cylinder lock ring 6 is an unclosed annular cylinder body, and an oblique butt joint edge is arranged in the annular cylinder body, so that the inner cylinder lock ring 6 has a certain Zhang Geneng force, and is more beneficial to smoothly entering the fracturing hole opening groove 206 in the outer cylinder 2 to lock the inner cylinder 5.
The outer diameter of the upper part of the lower joint 8 is in accordance with the inner diameter of the lower part of the inner cylinder 5, the inner cylinder 5 can axially slide in an annulus formed between the outer circle of the upper part of the lower joint 8 and the outer cylinder 2, an outer cylinder buckling step 803 is arranged on the outer circle of the middle part of the lower joint 8, and a connecting thread 802 connected with the outer cylinder 2 is arranged on the outer circle of the upper part of the outer cylinder buckling step 803; a lower joint drain hole 801 is arranged in the body of the lower joint 8 above the outer barrel upper buckling step 803, and the lower joint drain hole 801 can facilitate the descending of the inner barrel 5.
The staged fracturing sliding sleeve can be connected in a well completion pipe column corresponding to a fracturing layer section through an upper joint 1 and a lower joint 8, the number of the setting password grooves 503 or the groove body shape of each staged fracturing sliding sleeve connected in the well completion pipe column is different, and the setting parameters of the password grooves 503 can be adjusted according to actual well conditions, and the groove body shape refers to the groove height, the groove width, the groove depth or the groove wall structure. However, the number of the code blocks for opening the code slots 503 in the special switching tool of the staged fracturing sleeve which is put into the completion string and the block shape are in one-to-one correspondence with the code slots 503 of the staged fracturing sleeve in the invention, so that the staged fracturing sleeves in other fracturing intervals are not staggered or wrongly opened.
In use, the assembled staged fracturing sleeve is connected to a position in a predetermined completion string, and is in a use state after being lowered to a predetermined depth, and at this time the fracturing holes 204 in the staged fracturing sleeve are in a closed state.
During staged fracturing construction, the staged fracturing sliding sleeve connected in the well completion pipe column is opened from the bottommost layer through a special switching tool for the staged fracturing sliding sleeve, and after fracturing, the staged fracturing sliding sleeve corresponding to the upper layer in the well completion pipe column is opened, so that fracturing construction is implemented. And the construction of full-drift-diameter infinite-stage-division fracturing is completed from bottom to top in sequence.
The feeding of the special switch tool for the staged fracturing sliding sleeve can be realized by selecting a mechanical mode: the staged fracturing sliding sleeve special switch tool is connected to the lower end of the operation pipe column and is put into the well, and the staged fracturing sliding sleeve special switch tool is used for unlocking the staged fracturing sliding sleeve and pushing down the inner cylinder 5, so that the inner cylinder lock ring 6 is positioned in the fracturing hole opening groove 206 of the outer cylinder 2, and the fracturing hole 204 is opened by putting into the operation pipe column. And then releasing the operation pipe column, and after the operation pipe column on the special switch tool for the staged fracturing sliding sleeve is lifted out, carrying out fracturing construction of the layer. And after the fracturing of the layer, carrying out the next fracturing construction in sequence until the fracturing of all layers in the oil-gas well is completed. The special switch tool for the staged fracturing sliding sleeve of each layer is firstly reserved in a well after fracturing construction of each layer, and uniformly salvaged to the ground after the fracturing construction of all layers is completed.
The pumping mode can be selected by sending a special switch tool for the staged fracturing sliding sleeve: and (3) adjusting a special switching tool of the staged fracturing sliding sleeve corresponding to the staged fracturing sliding sleeve positioned at the lowest layer in the well completion string into an opening mode when the well head is down, and enabling the special switching tool of the staged fracturing sliding sleeve to reach the corresponding staged fracturing sliding sleeve through pumping down, wherein a password block in the special switching tool of the staged fracturing sliding sleeve is automatically popped into a password groove 503 of the staged fracturing sliding sleeve corresponding to the password block, so that the staged fracturing sliding sleeve of the layer is opened. After the fracturing construction is implemented, a special switch tool for the staged fracturing sliding sleeve is sequentially put into the staged fracturing sliding sleeve of other layers, and the staged fracturing is implemented from bottom to top.
The embodiments described above are only exemplary embodiments, but the present invention is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present invention should be included in the scope of the present invention. Therefore, the scope of protection is not limited to the description above.
Claims (10)
1. The staged fracturing well completion pipe column for the oil and gas well with the unlimited full-diameter is characterized in that a staged fracturing sliding sleeve corresponding to a fracturing layer is connected between the expanded open hole packer (03) and the differential pressure sliding sleeve (05) through the sleeve (01), and the fracturing layer is sealed by the compressed open hole packer (04);
the staged fracturing sliding sleeve is provided with an outer cylinder (2) and an inner cylinder (5), a fracturing hole (204) is formed in the outer cylinder (2), a pawl (501) is arranged on the upper body of the inner cylinder (5), a coded slot (503) is formed in the inner wall of the middle of the inner cylinder, an inner cylinder lock ring limiting step (504) is formed in the outer wall of the lower part of the inner cylinder, a lower baffle ring (7) is connected with the lower end of the inner cylinder (5), and an inner cylinder lock ring (6) is arranged between the inner cylinder lock ring limiting step (504) and the lower baffle ring (7);
an upper baffle ring limiting sealing step (201), a pawl locking groove (203), a fracturing Kong Guan closing groove (205) and a fracturing hole punching groove (206) are formed in the inner wall of the outer barrel (2), and a drainage hole (202) is further formed in the outer barrel (2) between the upper baffle ring limiting sealing step (201) and the pawl locking groove (203);
the upper joint (1) of the outer cylinder is connected with the upper part of the outer cylinder (2), and after the lower joint (8) is connected with the outer cylinder (2), the lower part of the inner cylinder (5) is positioned between the outer cylinder (2) and the lower joint (8);
the inner cylinder (5) is arranged in the outer cylinder (2), a pawl (501) at the upper part of the inner cylinder (5) is clamped in a pawl locking groove (203) of the outer cylinder (2), and an inner cylinder locking ring (6) is clamped between the inner cylinder (5) and a fracturing hole closing groove (205); the upper baffle ring (3) is connected with the upper lock cylinder (4) and then is arranged above the upper baffle ring limit sealing step (201) in the outer cylinder (2), and a reset spring (9) is also arranged between the upper lock cylinder (4) and the upper baffle ring limit sealing step (201), and the pawl (501) is clamped by the upper lock cylinder (4);
the minimum internal diameter of the staged fracturing sliding sleeve after the assembly is completed is consistent with the internal diameter of the well completion string.
2. An unconfined full-bore oil and gas well staged fracturing completion string according to claim 1, wherein the fracturing hole (204) is arranged in the outer barrel (2) between the pawl lock groove (203) and the fracturing hole closing groove (205).
3. An unconfined full-diameter oil and gas well staged fracturing completion string as claimed in claim 1, wherein the distance between the fracturing hole closing groove (205) and the fracturing hole opening groove (206) in the outer barrel (2) is consistent with the distance between the upper end of the pawl (501) and the hole wall at the lower end of the fracturing hole (204).
4. The staged fracturing completion string for the unlimited full-diameter oil and gas well, as claimed in claim 1, wherein the outer circle of the locking cylinder (4) is a non-equal-diameter outer circle, a reset spring limiting sealing step (402) is arranged on the outer circle of the middle part of the locking cylinder (4), a pawl locking cylinder (404) is arranged below the reset spring limiting sealing step (402), and the outer diameter of the pawl locking cylinder (404) is consistent with the inner diameter of the pawl (501).
5. The staged fracturing completion string for the oil and gas well with the unlimited full-diameter is characterized in that an upper outer circle of the upper lock cylinder (4) and a limit sealing step (402) of a reset spring are respectively provided with an upper lock cylinder sealing groove (401) and a lower lock cylinder sealing groove (403), and sealing elements are respectively arranged in the upper lock cylinder sealing groove (401) and the lower lock cylinder sealing groove (403); the lower end excircle of the pawl lock cylinder (404) is provided with a chamfer.
6. The staged fracturing completion string for the oil and gas well with the unlimited full-diameter as claimed in claim 1 or 4, wherein at least three pawls (501) are arranged at the upper part of the inner barrel (5), the claw hooks at the upper end of the pawl (501) are outwards, and the external shape of the claw hooks is consistent with the internal shape of the claw locking groove (203).
7. The staged fracturing completion string for an oil and gas well with unlimited full diameter as claimed in claim 6, wherein inner cylinder sealing grooves (502) are arranged in the outer wall of the inner cylinder (5) below the pawl (501) and correspond to positions above and below the fracturing holes (204) in the outer cylinder (2), and sealing elements are arranged in the inner cylinder sealing grooves (502).
8. An unconfined full-bore oil and gas well staged fracturing completion string as claimed in claim 1, wherein said inner barrel lock ring (6) is an unclosed annular cylinder in which a canted mating edge is provided.
9. The staged fracturing completion string for the oil and gas well with the unlimited full diameter according to claim 1, wherein the outer diameter of the upper part of the lower joint (8) is consistent with the inner diameter of the lower part of the inner barrel (5), the inner barrel (5) can axially slide in an annulus formed between the outer circle of the upper part of the lower joint (8) and the outer barrel (2), an outer barrel buckling step (803) is arranged on the outer circle of the middle part of the lower joint (8), and a connecting thread (802) connected with the outer barrel (2) is arranged on the outer circle of the upper part of the outer barrel buckling step (803); a lower joint drainage hole (801) is arranged in the body of the lower joint (8) above the upper buckling step (803) of the outer cylinder.
10. The staged fracturing completion string for the oil and gas wells with the unlimited full-diameter as claimed in claim 1, wherein the staged fracturing sliding sleeves can be connected in the completion string corresponding to the fracturing layer section through an upper connector (1) and a lower connector (8), the number or the shape of the setting of the password grooves (503) in each staged fracturing sliding sleeve connected in the completion string is different, and the setting parameters of the password grooves (503) can be adjusted according to actual well conditions.
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| CN202011019326.0A CN114427419B (en) | 2020-09-25 | 2020-09-25 | Stage fracturing completion string for unlimited full-drift-diameter oil and gas well |
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| CN202011019326.0A CN114427419B (en) | 2020-09-25 | 2020-09-25 | Stage fracturing completion string for unlimited full-drift-diameter oil and gas well |
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| CN114427419A CN114427419A (en) | 2022-05-03 |
| CN114427419B true CN114427419B (en) | 2023-12-01 |
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| CN114427420B (en) * | 2020-09-25 | 2024-03-22 | 中国石油化工股份有限公司 | Stage fracturing sliding sleeve of unlimited full-drift-diameter oil-gas well |
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| EP0427422A2 (en) * | 1989-11-08 | 1991-05-15 | Halliburton Company | Casing valve |
| CN102330546A (en) * | 2011-09-30 | 2012-01-25 | 中国石油化工股份有限公司 | Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string |
| WO2016033983A1 (en) * | 2014-09-04 | 2016-03-10 | 杰瑞能源服务有限公司 | Coiled tubing fracturing multistage tool string and utilization method |
| CN110454129A (en) * | 2019-08-08 | 2019-11-15 | 中国石油天然气股份有限公司 | Gas well separate-layer fracturing and water control integrated process pipe column |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016179685A1 (en) * | 2015-05-11 | 2016-11-17 | Ncs Multistage Inc. | Downhole flow control apparatus |
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2020
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|---|---|---|---|---|
| EP0427422A2 (en) * | 1989-11-08 | 1991-05-15 | Halliburton Company | Casing valve |
| CN102330546A (en) * | 2011-09-30 | 2012-01-25 | 中国石油化工股份有限公司 | Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string |
| WO2016033983A1 (en) * | 2014-09-04 | 2016-03-10 | 杰瑞能源服务有限公司 | Coiled tubing fracturing multistage tool string and utilization method |
| CN110454129A (en) * | 2019-08-08 | 2019-11-15 | 中国石油天然气股份有限公司 | Gas well separate-layer fracturing and water control integrated process pipe column |
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