CN111963133A - Throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and fracturing method thereof - Google Patents
Throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and fracturing method thereof Download PDFInfo
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- CN111963133A CN111963133A CN202010961241.8A CN202010961241A CN111963133A CN 111963133 A CN111963133 A CN 111963133A CN 202010961241 A CN202010961241 A CN 202010961241A CN 111963133 A CN111963133 A CN 111963133A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and a fracturing method thereof, wherein the string comprises a flow guide ball seat, a first throttling-free self-service deblocking packer, a throttling-free sand blasting sliding sleeve, a second throttling-free self-service deblocking packer, a sand prevention hydraulic anchor and a hydraulic safety joint which are sequentially connected from bottom to top through an oil pipe; the flow guide ball seat comprises a first cylindrical body, and a valve ball and a baffle ring which are arranged in the first cylindrical body from bottom to top; the packer comprises a pipe body structure, a sealing mechanism and a power mechanism, wherein the sealing mechanism and the power mechanism are sleeved on the outer side of the pipe body from bottom to top; the non-throttling sand blasting sliding sleeve comprises a second cylindrical body, and a plurality of sand blasting holes are uniformly distributed in the side wall of the second cylindrical body along the circumferential direction; the fracturing string and the construction method have the advantages of convenient operation of the running-in and running-out processes of the string, high fracturing operation efficiency, low cost and small risk, and can be popularized and used in vertical wells and horizontal wells.
Description
Technical Field
The invention relates to the technical field of fracturing operation of oil and gas fields, in particular to a throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and a fracturing method thereof.
Background
At present, a double-sealing single-clamping staged fracturing string applied in the selective repeated fracturing modification operation process of a horizontal well mainly has the following two structural forms, namely a double-sealing single-clamping staged fracturing string adopting a K344 packer and a double-sealing single-clamping staged fracturing string adopting a Y211 packer and a Y111 packer.
However, in a large number of field operations, these two fracturing strings also have a number of disadvantages:
(1) if a double-sealing single-clamping staged fracturing string with a K344 packer is adopted, the packer is set by throttling generated by the fracturing string, so that the construction scale is limited, the pumping pressure of a wellhead is increased, the construction efficiency is sacrificed, and the requirement of large-scale fracturing construction cannot be met; due to throttling of the sand spraying hole of the throttling sand spraying sliding sleeve, the sand conveying efficiency is reduced, the flow velocity of the fracturing fluid passing through the sand spraying hole is increased, abrasion of the sand spraying hole is intensified, back-splashing generated by the high-flow-velocity fracturing fluid can also generate serious erosion damage to the sand spraying hole and a production casing, accidents such as fracturing pipe column fracture and production casing deformation can be caused, and great risk is brought to subsequent shaft operation; in the process of lifting and lowering the fracturing string, because the original reservoir section is mined out to form negative pressure, relative pressure difference is easily formed between the upper part and the lower part of the packer, the packer is set in advance, and the accidents that a rubber sleeve is damaged by friction and fails or the rubber sleeve cannot recover stuck drill are caused;
(2) if the double-seal single-clamp staged fracturing string of the Y211 packer and the Y111 packer is adopted, the setting and unsetting operation of the packer is realized by lifting and lowering the fracturing string, so that the requirement on the operation level of field technicians is high, a rail changing channel of the packer is easily blocked by settled sand in the fracturing string, the fracturing string is difficult to lift or the fracturing string cannot be lifted out, and the problem of underground construction is more complex.
Disclosure of Invention
The invention aims to provide a throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string, which can adjust the pre-tightening force of a spring of a packer according to the vertical depth of an oil-gas well before the fracturing string is put into the fracturing string, so as to balance the influence of the pressure of a hydrostatic string in the well, avoid the packer from generating unnecessary advanced setting, improve the safety of putting the fracturing string into the fracturing string and ensure that the fracturing string can be lifted up and out smoothly.
The invention also aims to provide a fracturing method implemented by adopting the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string.
Therefore, the technical scheme of the invention is as follows:
a non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string comprises a flow guide ball seat, a first non-throttling self-service deblocking packer, a non-throttling sand blasting sliding sleeve, a second non-throttling self-service deblocking packer, a sand prevention hydraulic anchor and a hydraulic safety joint which are sequentially connected from bottom to top through an oil pipe; wherein the content of the first and second substances,
the flow guide ball seat comprises a first cylindrical body, and a valve ball and a baffle ring which are arranged in the first cylindrical body from bottom to top; the inner diameter of the upper part of the first cylindrical body is larger than that of the lower part of the first cylindrical body, and the diameter-variable part is a conical surface with the inner diameter gradually reduced from top to bottom; the baffle ring is arranged on a first limiting step positioned above the conical surface, is of a disc structure, and is provided with four right-angle fan-shaped through holes at the disc surface; the diameter of the valve ball is matched with the size of the conical surface, so that the valve ball can be seated on the conical surface of the first cylindrical body; two oblique overflowing holes communicated with the inner cavity of the first cylindrical body are symmetrically formed in the side wall of the lower part of the first cylindrical body;
the non-throttling self-service deblocking packer comprises an upper joint, an upper central pipe, a sealing mechanism, a spring central pipe, a power mechanism, a lower central pipe and a lower joint; the upper joint, the upper central pipe, the spring central pipe, the lower central pipe and the lower joint are sequentially in threaded connection from top to bottom; the sealing mechanism is arranged on the outer side of the upper central tube, the power mechanism is arranged on the outer side of the spring central tube and comprises a power piston and a spring, the power piston is sleeved on the outer sides of the spring central tube and the lower central tube, and a spring groove is formed between the power piston and the spring central tube, so that the spring is sleeved on the outer side of the spring central tube and is arranged in the spring groove in a compressed state; the top ends of the spring central tube and the power piston are jointly abutted against the lower end face of the sealing mechanism, and the bottom end of the power piston is press-fitted on the upper end face of the annular step on the outer wall of the lower joint; a plurality of strip-shaped pressure transmission slots are uniformly distributed on the side wall of the lower central tube, and each pressure transmission slot is communicated with an annular power cavity formed by the power piston, the lower central tube and the lower joint; an annular air cavity formed by the power piston and the lower central tube is arranged above the pressure transfer slot, and an annular boss for limiting the upward stroke of the power piston is arranged in the middle part of the outer wall of the lower central tube in the annular air cavity;
the non-throttling sand blasting sliding sleeve comprises a second cylindrical body, and a plurality of sand blasting holes are formed in the side wall of the second cylindrical body along the circumferential direction; the sand blasting holes are axial long holes, and the total area of the sand blasting holes is one time of the cross section area of the inner drift diameter of the oil pipe.
Further, the oblique overflowing hole is a communicating hole formed in the outer wall of the first cylindrical body in an oblique downward mode, and an included angle formed between a central axis of the oblique overflowing hole and a central axis of the first cylindrical body is 60 degrees.
Furthermore, the inner wall of the upper part of the first cylindrical body is provided with a connecting internal thread matched with the oil pipe; the bottom end face of the first cylindrical body is processed into a spherical surface.
Further, a first sealing ring is arranged on a contact wall surface between the power piston and the lower central pipe and above the second limiting step; a second sealing ring is arranged on the contact wall surface between the power piston and the lower central pipe and below the pressure transfer slot; and a third sealing ring is arranged on the contact wall surface between the power piston and the lower joint.
Furthermore, the sealing mechanism comprises a rubber cylinder and a spacer ring which are sequentially sleeved outside the upper central pipe from top to bottom, so that the top end and the bottom end of the rubber cylinder are respectively abutted to the lower end face of the upper joint and the upper end face of the spacer ring.
A fracturing method implemented by the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string comprises the following steps:
s1, putting the fracturing string into the production casing of the oil and gas well, and enabling the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the first reservoir section;
s2, pressurizing from the inside of the oil pipe, positively closing the flow guide ball seat, sealing an annular space between the oil pipe and the production casing when the set pressure is reached, completing primary sealing by the non-throttling self-service deblocking packer, continuously improving the pressure of the oil pipe until the packer rubber barrel reaches the optimal compression effect, and completing setting by the non-throttling self-service deblocking packer; then, performing fracturing construction on the first section through the non-throttling sand blasting sliding sleeve;
s3, after the construction is finished, stopping the pump, and releasing the pressure through the oil pipe to enable the choke-free self-service deblocking packer to deblock; then lifting the fracturing string to enable the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the second reservoir section;
and S4, repeating the steps S2-S3, and completing the fracturing construction of the subsequent storage interval in sequence.
Compared with the prior art, the throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string can adjust the spring pretightening force of the packer according to the vertical depth of an oil-gas well before the fracturing string is put into the fracturing string, so that the influence of the hydrostatic string pressure in the well is balanced, the packer is prevented from generating unnecessary advanced setting, and the safety of the fracturing string in the putting-in process is improved; in the setting process of the packer, the throttling of the fracturing string is not needed, the throttling is only related to the pressure in the fracturing string and is unrelated to the internal and external pressure difference of the fracturing string, the setting process is convenient to control, and the sealing is stable and reliable; in the fracturing construction process, the requirement of large-scale fracturing construction is met because the throttling is not required to be generated through the sand blasting holes of the sand blasting sliding sleeve; in addition, after each section of fracturing construction is finished, the rubber sleeve is rapidly deblocked under the double actions of the self resilience force and the self-help deblocking force of the spring, so that the fracturing string is smoothly lifted and lifted; the fracturing construction method based on the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string has the advantages of convenience in field operation, high operation efficiency, low cost and small risk, and can be popularized and used in vertical wells and horizontal wells.
Drawings
FIG. 1 is a schematic structural diagram of a non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string according to the present invention;
FIG. 2 is a schematic structural diagram of a diversion ball seat of the choke-free self-service deblocking type double-seal single-clamp staged fracturing string;
FIG. 3 is a schematic cross-sectional structural view of a flow guiding ball seat of the choke-free self-service deblocking type double-seal single-clamp staged fracturing string of the invention;
FIG. 4 is a schematic structural diagram of an initial state of a non-throttling self-deblocking packer of the non-throttling self-deblocking type double-sealing single-clamp staged fracturing string according to the present invention;
FIG. 5 is a schematic structural diagram of a setting state of a non-throttling self-service deblocking packer of the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string according to the present invention;
fig. 6 is a schematic structural diagram of the no-throttle sand blasting sliding sleeve of the no-throttle self-service deblocking type double-seal single-clamp staged fracturing string.
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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.
In the description of the invention, the term "initial state" refers to the non-operating state of the unthrottled self-service unsetting packer. Wherein, the sand control hydraulic anchor, the hydraulic safety joint, the oil pipe and the production casing are all commercially available products.
Example 1
As shown in fig. 1, the non-throttling self-service unsetting double-sealing single-clamping staged fracturing string comprises a diversion ball seat a, a first non-throttling self-service unsetting packer B, a non-throttling sand blasting sliding sleeve C, a second non-throttling self-service unsetting packer B, a sand-prevention hydraulic anchor D and a hydraulic safety joint E which are sequentially connected from bottom to top; the tools are connected through a 2-7/8 ' oil pipe F or a 2-7/8 ' oil pipe short section and are arranged in the production casing G, and the top end of the hydraulic safety joint E is also connected with the 2-7/8 ' oil pipe F, an oil pipe hanger and an oil compensation distance from bottom to top.
As shown in fig. 2 and 3, the guide ball seat includes a first cylindrical body 3, and a valve ball 2 and a retainer ring 1 disposed in the first cylindrical body 3 from bottom to top; the inner diameter of the upper part of the first cylindrical body 3 is larger than that of the lower part, and the diameter-changing part is a conical surface with the inner diameter gradually reduced from top to bottom; the baffle ring 1 is arranged on a first limiting step positioned above the conical surface, is of a disc structure, and is provided with four right-angled fan-shaped through holes at the disc surface; the diameter of the valve ball 2 is adapted to the size of the conical surface, so that the valve ball can be seated on the conical surface of the first cylindrical body 3; two oblique overflowing holes communicated with the inner cavity of the first cylindrical body 3 are symmetrically formed in the side wall of the lower portion of the first cylindrical body 3.
As a preferable technical solution of this embodiment, the oblique overflowing hole is a communicating hole formed obliquely downward from the outer wall of the first cylindrical body 3, and specifically, an included angle formed between a central axis of the oblique overflowing hole and a central axis of the first cylindrical body 3 is 60 °.
The inner wall of the upper part of the first cylindrical body 3 is provided with a connecting internal thread matched with an oil pipe; the bottom end face of the first cylindrical body 3 is processed into a spherical surface.
The guide ball seat has the function of guide shoes, and the fracturing string can be ensured to be smoothly put into the specified position of the production casing through the lower hemispherical structural design; simultaneously, this water conservancy diversion ball seat still has the function of check valve, can realize that forward is closed, and reverse opening, through the design of this structure, not only avoided the well head when taking off the fracturing string to emit and spout, reached the requirement of safety ring protects production, can guarantee moreover that the fracturing string accomplishes double-seal single calorie of fixed point fracturing construction and reverse circulation well-flushing operation.
As shown in fig. 4 and 5, the choke-free self-service unsetting packer comprises an upper joint 4, an upper central tube 5, a sealing mechanism, a spring central tube 8, a power mechanism, a lower central tube 11 and a lower joint 15; the upper joint 4, the upper central tube 5, the spring central tube 8, the lower central tube 11 and the lower joint 15 are sequentially in threaded connection from top to bottom; wherein the content of the first and second substances,
the sealing mechanism is arranged on the outer side of the upper central tube 5 and comprises a rubber cylinder 6 and a spacing ring 7 which are sequentially sleeved on the outer side of the upper central tube from top to bottom, so that the top end and the bottom end of the rubber cylinder 6 are respectively abutted against the lower end face of the upper joint 4 and the upper end face of the spacing ring 7;
the power mechanism is arranged on the outer side of the spring central tube 8 and comprises a power piston 9 and a spring 10, the power piston 9 is sleeved on the outer sides of the spring central tube 8 and the lower central tube 11, a spring groove is formed between the power piston 9 and the spring central tube 8, and the spring 10 is sleeved on the outer side of the spring central tube 8 and is arranged in the spring groove in a compressed state; the top ends of the spring central tube 8 and the power piston 9 are abutted against the lower end face of the sealing mechanism together, and the bottom end of the power piston 9 is press-fitted on the upper end face of an annular step on the outer wall of the lower joint 15; four pressure transmission slots which are used for transmitting hydraulic pressure and are in a long and thin strip shape are uniformly distributed on the side wall of the lower central tube 11, and each pressure transmission slot is communicated with an annular power cavity which is formed by surrounding of the power piston 9, the lower central tube 11 and the lower connector 15; an annular air cavity formed by the power piston 9 and the lower central tube 11 is arranged above the pressure transfer slot, and an annular boss for limiting the upward stroke of the power piston 9 is arranged in the middle part of the outer wall of the lower central tube 11 in the annular air cavity;
in order to ensure the whole sealing performance of the device, a first sealing ring 12 is arranged on the contact wall surface between the power piston 9 and the lower central tube 11 and above the second limiting step; a second sealing ring 13 is arranged on the contact wall surface between the power piston 9 and the lower central tube 11 and below the pressure transfer slot; a third seal ring 14 is provided on the contact wall surface between the power piston 9 and the lower joint 15.
The non-throttling self-service unsetting packer adopts simple and convenient hydraulic setting on the structural design, does not need to be provided with a shearing pin, does not need throttling setting, is only related to the pressure in the pipe column and is unrelated to the pressure difference between the inside and the outside of the pipe column, and can be used for pressing, namely setting, and not pressing, unsetting and the setting process is convenient to control; the middle part of the lower central tube is provided with a limiting step, so that the excessive movement of the power piston caused by the excessive pressure in the tube column is avoided, and the fatigue fracture of the rubber cylinder caused by the excessive compression of the rubber cylinder is prevented from influencing the sealing effect; in addition, the sealing mechanism adopts a compression rubber cylinder, and compared with an expansion rubber cylinder, the rubber cylinder has large pressure difference bearing capacity and good and stable setting effect; simultaneously this packer passes through the spring and realizes the deblocking by oneself, be promptly before fracturing string down, can adjust the spring pretightning force that corresponds according to the vertical depth of oil gas well, with the influence of hydrostatic column pressure in the balanced well, avoid transferring the tubular column in-process and produce unnecessary and sit in advance and seal, cause the packing element to damage, and after each section fracturing construction, make the packing element obtain quick deblocking under the dual function of the resilience force of self and the self-service deblocking power of spring through the tubular column pressure release, lift smoothly and play out for the fracturing tubular column and provide the assurance.
As shown in fig. 6, the non-throttling sand blasting sliding sleeve comprises a second cylindrical body, wherein four sand blasting holes are formed in the side wall of the second cylindrical body along the circumferential direction; the sand blasting holes are axial long holes, and the total area of the four sand blasting holes is 1.5 times of the cross section area of the inner drift diameter of the oil pipe.
The equivalent sectional area of the sand blasting hole of the non-throttling sand blasting sliding sleeve is 1.5 times of the inner drift diameter sectional area of the oil pipe, and the sand blasting hole is not throttled, so that the sand conveying efficiency is improved, the erosion damage of a fracturing fluid to the sand blasting hole and a production casing is reduced, and the safety of a fracturing string and the production casing is improved. And then, based on no throttling of the sand blasting holes, the fracturing string does not have the throttling problem, so that the over-flow rate and the over-flow speed are equal to the full drift diameter of the oil pipe of 2-7/8 ″, the phenomenon of 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.
Example 2
A fracturing method implemented by the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string comprises the following steps:
s1, putting the fracturing string into the production casing of the oil and gas well, and enabling the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the first reservoir section;
s2, pressurizing from the inside of the oil pipe to enable the diversion ball seat to be closed in the forward direction, enabling pressure to act on the power piston 9 through a slot on the lower central pipe 11 in the non-throttling self-service deblocking packer B to push the power piston 9 to go upward to compress the spring 10, meanwhile pushing the spacer ring 7 to go upward to compress the rubber cylinder 6, when the pressure reaches a preset value, sealing an annular space between the oil pipe F and the production casing G, at the moment, completing primary sealing of the non-throttling self-service deblocking packer B, continuously improving the pressure of the oil pipe F, when the power piston 9 goes upward to a limiting step on the lower central pipe 11, enabling the rubber cylinder 6 to achieve the best compression effect, and at the moment, completing setting of the non-throttling self-service deblocking packer B; then, performing fracturing construction on the first section through the non-throttling sand blasting sliding sleeve;
s3, after construction is finished, stopping a pump, releasing pressure through an oil pipe F, enabling a spring 10 in the non-throttling self-help deblocking packer B to automatically descend by the resilience force of the spring, pushing a power piston 9 to descend, and reserving a free space for a rubber cylinder 6, wherein the rubber cylinder 6 descends by the resilience force of the rubber cylinder 6 due to the fact that the rubber cylinder 6 is not restrained by descending pressure, and the non-throttling self-help deblocking packer B completes deblocking; then lifting the fracturing string to enable the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the second reservoir section;
and S4, repeating the steps S2-S3, and completing the fracturing construction of the subsequent storage interval in sequence.
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.
The applicants hereby give notice that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string is characterized by comprising a flow guide ball seat, a first non-throttling self-service deblocking packer, a non-throttling sand blasting sliding sleeve, a second non-throttling self-service deblocking packer, a sand-prevention hydraulic anchor and a hydraulic safety joint which are sequentially connected from bottom to top through an oil pipe; wherein the content of the first and second substances,
the flow guide ball seat comprises a first cylindrical body (3), and a valve ball (2) and a baffle ring (1) which are arranged in the first cylindrical body (3) from bottom to top; the inner diameter of the upper part of the first cylindrical body (3) is larger than that of the lower part, and the diameter-variable part is a conical surface with the inner diameter gradually reduced from top to bottom; the baffle ring (1) is arranged on a first limiting step positioned above the conical surface, the baffle ring (1) is of a disc structure, and four right-angled fan-shaped through holes are formed in the disc surface of the baffle ring; the diameter of the valve ball (2) is adapted to the size of the conical surface, so that the valve ball can be seated on the conical surface of the first cylindrical body (3); two oblique overflowing holes communicated with the inner cavity of the first cylindrical body (3) are symmetrically formed in the side wall of the lower part of the first cylindrical body (3);
the non-throttling self-service deblocking packer comprises an upper joint (4), an upper central pipe (5), a sealing mechanism, a spring central pipe (8), a power mechanism, a lower central pipe (11) and a lower joint (15); the upper joint (4), the upper central pipe (5), the spring central pipe (8), the lower central pipe (11) and the lower joint (15) are sequentially in threaded connection from top to bottom; the sealing mechanism is arranged on the outer side of the upper central tube (5), the power mechanism is arranged on the outer side of the spring central tube (8) and comprises a power piston (9) and a spring (10), the power piston (9) is sleeved on the outer side of a tube body formed by the spring central tube (8) and the lower central tube (11), a spring groove is formed between the power piston (9) and the spring central tube (8), and the spring (10) is sleeved on the outer side of the spring central tube (8) and is arranged in the spring groove in a compressed state; the top ends of the spring central tube (8) and the power piston (9) are abutted against the lower end face of the sealing mechanism together, and the bottom end of the power piston (9) is press-fitted on the upper end face of an annular step on the outer wall of the lower joint (15); a plurality of pressure transmission slots are uniformly distributed on the side wall of the lower central tube (11), and each pressure transmission slot is communicated with an annular power cavity surrounded by the power piston (9), the lower central tube (11) and the lower connector (15); an annular air cavity formed by the power piston (9) and the lower central tube (11) is arranged above the slot, and an annular boss for limiting the upward stroke of the power piston (9) is arranged in the middle part of the outer wall of the lower central tube (11) in the annular air cavity;
the non-throttling sand blasting sliding sleeve comprises a second cylindrical body (16), and a plurality of sand blasting holes are formed in the side wall of the second cylindrical body along the circumferential direction; the sand blasting holes are axial long holes, and the total area of the sand blasting holes is 1.5 times of the cross section area of the inner drift diameter of the oil pipe.
2. The choke-free self-service deblocking type double-seal single-clamp staged fracturing string as claimed in claim 1, wherein the oblique overflowing holes are communication holes formed obliquely downward from the outer wall of the first cylindrical body (3), and an included angle formed between the central axis of the oblique overflowing holes and the central axis of the first cylindrical body (3) is 60 °.
3. The non-throttling self-service deblocking type double-seal single-clamp staged fracturing string as claimed in claim 1, wherein the inner wall of the upper part of the first cylindrical body (3) is provided with a connecting internal thread matched with an oil pipe; the end surface of the bottom end of the first cylindrical body (3) is processed into a spherical surface.
4. The choke-free self-service deblocking type double-seal single-clamp staged fracturing string as claimed in claim 1, wherein a first seal ring (12) is arranged on a contact wall surface between the power piston (9) and the lower central pipe (11) and above the second limit step; a second sealing ring (13) is arranged on the contact wall surface between the power piston (9) and the lower central pipe (11) and below the pressure transfer slot; a third sealing ring (14) is arranged on the contact wall surface between the power piston (9) and the lower joint (15).
5. The non-throttling self-service-deblocking type double-seal single-clamp staged fracturing string as claimed in claim 1, wherein the sealing mechanism comprises a rubber cylinder (6) and a spacer ring (7) which are sequentially sleeved outside the upper central pipe from top to bottom, so that the top end and the bottom end of the rubber cylinder (6) respectively abut against the lower end face of the upper joint (4) and the upper end face of the spacer ring (7).
6. A fracturing method implemented by adopting the non-throttling self-service deblocking type double-sealing single-clamp staged fracturing string as claimed in any one of claims 1 to 5, is characterized by comprising the following steps:
s1, putting the fracturing string into the production casing of the oil and gas well, and enabling the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the first reservoir section;
s2, pressurizing from the inside of the oil pipe, positively closing the flow guide ball seat, sealing an annular space between the oil pipe and the production casing when the set pressure is reached, completing primary sealing by the non-throttling self-service deblocking packer, continuously improving the pressure of the oil pipe until the packer rubber barrel reaches the optimal compression effect, and completing setting by the non-throttling self-service deblocking packer; then, performing fracturing construction on the first section through the non-throttling sand blasting sliding sleeve;
s3, after the construction is finished, stopping the pump, and releasing the pressure through the oil pipe to enable the choke-free self-service deblocking packer to deblock; then lifting the fracturing string to enable the sand blasting holes of the non-throttling sand blasting sliding sleeve to correspond to the second reservoir section;
and S4, repeating the steps S2-S3, and completing the fracturing construction of the subsequent storage interval in sequence.
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|---|---|---|---|
| CN202010961241.8A CN111963133A (en) | 2020-09-14 | 2020-09-14 | Throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and fracturing method thereof |
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| CN202010961241.8A CN111963133A (en) | 2020-09-14 | 2020-09-14 | Throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and fracturing method thereof |
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| CN111963133A true CN111963133A (en) | 2020-11-20 |
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| CN202010961241.8A Withdrawn CN111963133A (en) | 2020-09-14 | 2020-09-14 | Throttling-free self-service deblocking type double-sealing single-clamp staged fracturing string and fracturing method thereof |
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| CN116066011A (en) * | 2023-03-20 | 2023-05-05 | 四川圣诺油气工程技术服务有限公司 | Oil pipe plug and use method thereof |
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