CN111520112A - Step-by-step directional hydraulic jet separate layer fracturing string - Google Patents
Step-by-step directional hydraulic jet separate layer fracturing string Download PDFInfo
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- CN111520112A CN111520112A CN202010464158.XA CN202010464158A CN111520112A CN 111520112 A CN111520112 A CN 111520112A CN 202010464158 A CN202010464158 A CN 202010464158A CN 111520112 A CN111520112 A CN 111520112A
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- jet
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- 238000007789 sealing Methods 0.000 claims abstract description 65
- 238000002347 injection Methods 0.000 claims abstract description 50
- 239000007924 injection Substances 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims description 58
- 238000007667 floating Methods 0.000 claims description 47
- 238000003825 pressing Methods 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 21
- 210000000078 claw Anatomy 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Classifications
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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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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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
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- 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
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
-
- 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
-
- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Abstract
The invention relates to the technical field of underground fracturing devices, in particular to a step-by-step oriented hydraulic jet layered fracturing string which comprises a hydraulic anchor, a well completion sliding sleeve, a step-by-step fracturing assembly, a check valve, a sieve tube and a guide head which are connected with a continuous oil tube in series from top to bottom, wherein the step-by-step fracturing assembly comprises at least two fracturing components which are connected with each other in series from top to bottom. The ball injection device is reasonable and compact in structure and convenient to use, and the ball injection device is convenient for ball injection to start seat sealing step by arranging the first sliding sleeve and the first shear pin; the lower part of the descending first sliding sleeve is radially expanded outwards by arranging the diameter expansion ring groove, so that the pressure build-up ball continuously falls; the novel crack can be opened in different directions of the original crack net by arranging the asymmetrically distributed injection holes on the injector body; through setting up second sliding sleeve and second shear pin, the jet orifice on the sprayer body is opened step by step to the bowling realization of being convenient for, has stably, easily forms new seam and the characteristics of being convenient for control.
Description
Technical Field
The invention relates to the technical field of underground fracturing devices, in particular to a step-by-step directional hydraulic jet separate-layer fracturing string.
Background
Hydraulic jet fracturing is an important oil and gas well development mode at present, integrates sand-collecting and jetting perforation, fracturing and isolation, and is suitable for oil and gas wells of various well types. In the perforation fracturing process, a packer is needed to be used for packing a plurality of oil-gas layers, mutual interference and influence between construction layers are eliminated, the trend of fracturing sand fluid is ensured to enter a construction target layer, and the fracturing construction effect is improved. At present, when separate-layer fracturing operation is carried out, different oil and gas layers need to be set in the step-by-step fracturing process from bottom to top, and step-by-step setting cannot be realized through the conventional packer; in addition, the hydraulic ejector provided with nozzles in a circumferentially and uniformly distributed manner has quick attenuation of the jetting energy of fracturing sand liquid, can only enter and extend along the conventional fracturing crack direction, cannot generate a new crack net, and a sand blaster needs to be replaced when 2-3 layers of the sand blaster are constructed generally.
Disclosure of Invention
The invention provides a step-by-step directional hydraulic jet separate-layer fracturing string, overcomes the defects of the prior art, can effectively solve the problem that the conventional packer cannot realize step-by-step setting, and further solves the problem that the conventional hydraulic jet cannot generate a new seam net.
The technical scheme of the invention is realized by the following measures: a step-by-step directional hydraulic jet layered fracturing string comprises a hydraulic anchor, a well completion sliding sleeve, a step-by-step fracturing assembly, a check valve, a sieve tube and a guide head which are serially connected with a continuous oil tube from top to bottom, wherein the step-by-step fracturing assembly comprises at least two fracturing components serially connected from top to bottom, each fracturing component comprises a packer, a cross oil separating tube, a centralizer and an ejector which are serially connected from top to bottom, each packer comprises an upper joint, a central tube, a lower joint, a rubber cylinder device and a first sliding sleeve, an upper joint is fixedly installed on the outer side of the upper portion of the central tube, a lower joint is fixedly installed on the outer side of the lower portion of the central tube, a rubber cylinder assembly with expandable liquid inlet is installed on the outer side of the middle portion of the central tube, an expansion gap is formed between the rubber cylinder assembly and the central tube, a liquid inlet through which an inner tube and an outer tube pass is formed in, the upper end of the first sliding sleeve is positioned above the liquid inlet hole, the lower end of the first sliding sleeve is positioned below the liquid inlet hole, and an expanding ring groove is formed in the inner side of the middle of the lower connector corresponding to the position below the first sliding sleeve; the sprayer includes sprayer body, nozzle and second sliding sleeve, and this internal overflow channel that link up from top to bottom that is equipped with of sprayer, the sprayer body outside along circumferencial direction interval distribution about have at least two can with overflow the jet orifice of passageway intercommunication, equal fixed mounting has the nozzle in the jet orifice, through second shear pin fixed mounting have the second sliding sleeve in the overflow channel, the second sliding sleeve upper end is located the jet orifice top of the position of the top, the second sliding sleeve lower extreme is located the jet orifice below of the position of the bottom.
The following is further optimization or/and improvement of the technical scheme of the invention:
the rubber sleeve assembly comprises an outer rubber sleeve, an inner rubber sleeve and support bars, the outer side of the middle part of the central tube is sleeved with the inner rubber sleeve, the outer side of the inner rubber sleeve is uniformly provided with at least two support bars along the circumference, the upper ends of the support bars are fixedly arranged with the corresponding positions of the outer side of the upper end of the inner rubber sleeve, the lower ends of the support bars are fixedly arranged with the corresponding positions of the outer side of the lower end of the inner rubber sleeve, the outer rubber sleeve is sleeved on the outer side of the middle part of the inner rubber sleeve, and the inner side of the middle part of the outer rubber sleeve is fixedly arranged with the outer side of the middle part of; the upper end of the inner rubber cylinder is fixedly arranged together with the upper joint through an upper fixing assembly, the lower end of the inner rubber cylinder is fixedly provided with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint, and the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly is fixedly provided with a limiting assembly.
The upper fixing device can comprise an upper rubber cylinder seat, the outer side of the lower end of the upper joint is fixedly provided with the upper rubber cylinder seat, and the inner side of the lower end of the upper rubber cylinder seat is fixedly arranged with the inner rubber cylinder; the lower floating assembly comprises a lower rubber cylinder seat, a floating sleeve and a first sealing ring, the outer side of the middle part of the lower joint is provided with the floating sleeve, the upper part of the floating sleeve is positioned above the lower rubber cylinder seat, the floating sleeve comprises a connecting part and a floating part, the outer side of the upper end of the connecting part is fixedly installed with the inner side of the upper end of the floating part, the lower rubber cylinder seat sleeved on the outer side of the lower part of the central pipe is fixedly installed at the lower end of the inner rubber cylinder, the inner side of the lower end of, a sealing ring table is arranged on the outer side of the upper part of the lower joint corresponding to the position below the liquid inlet hole, a sliding vertical groove is arranged on the inner side of the upper end of the floating part corresponding to the position above the sealing ring table, a sliding block is fixedly installed on the outer side of the upper end of the lower joint, the outer end of the sliding block is positioned in the sliding vertical groove, at least one first sealing ring is arranged between the lower rubber cylinder seat and the connecting part at an upper-lower interval, at least one first sealing ring is arranged between the lower joint and the central pipe at an upper-lower interval, and at least one first sealing ring is arranged between the; the limiting assembly comprises a limiting stop ring and a limiting screw, the limiting stop ring is arranged on the outer side of the middle part of the lower connector corresponding to the lower position of the floating assembly, and the limiting stop ring is fixedly installed together with the lower connector through the limiting screw.
Preferably, the right side of the upper part of the injector body can be provided with an injection hole, and the front side of the lower part of the injector is provided with an injection hole; the axis of the injection hole at the right side is a first axis, the projection of the first axis on the horizontal plane is a first projection, the axis of the injection hole at the front side is a second axis, the projection of the second axis on the horizontal plane is a second projection, the included angle between the first projection and the second projection is a first included angle, and the first included angle is 75-150 degrees.
The ejector comprises an ejector body and is characterized by further comprising a first centering block and a second centering block, wherein the first centering block and the second centering block are arranged on the left rear side of the ejector body at intervals and correspond to positions between the injection holes, an angular bisector of the first included angle is a symmetry line, the projection of the first centering block on the horizontal plane is a third projection, the projection of the second centering block on the horizontal plane is a fourth projection, and the third projection and the fourth projection are symmetrical along the symmetry line.
The first angle may be 90 °.
Preferably, the right side of the upper part of the injector body can be provided with an injection hole, the front side of the middle part of the injector is provided with an injection hole, and the left rear side of the lower part of the injector body is provided with an injection hole; the axis of the injection hole positioned at the right side is a third axis, the projection of the third axis on the horizontal plane is a sixth projection, the axis of the injection hole positioned at the front side is a fourth axis, the projection of the fourth axis on the horizontal plane is a seventh projection, the axis of the injection hole positioned at the left rear side is a fifth axis, and the projection of the fifth axis on the horizontal plane is an eighth projection; an included angle between the sixth projection and the seventh projection is a second included angle, the second included angle is between 75 degrees and 150 degrees, an included angle between the seventh projection and the eighth projection is a third included angle, the third included angle is between 75 degrees and 150 degrees, an included angle between the eighth projection and the sixth projection is a fourth included angle, and the fourth included angle is between 75 degrees and 150 degrees.
The ejector comprises an ejector body, a front ejector body and a rear ejector body, and is characterized by further comprising a third centering block, a fourth centering block and a fifth centering block, wherein the third centering block is arranged on the left side of the ejector body corresponding to the position of the right-side injection hole, the fourth centering block is arranged on the rear side of the ejector body corresponding to the position of the front-side injection hole, and the fifth centering block is arranged on the right front side of the ejector body corresponding to the position of the left-rear injection hole.
The second included angle may be 90 °, the third included angle 135 °, and the fourth included angle 135 °.
The first sliding sleeve can comprise a blocking sleeve, elastic claws and second sealing rings, the upper end of the blocking sleeve is positioned above the liquid inlet hole, the lower end of the blocking sleeve is positioned below the liquid inlet hole, the elastic claws are fixedly installed at the lower end of the blocking sleeve at intervals along the circumferential direction, a limiting boss is arranged on the outer side of the lower end of each elastic claw, the second sealing rings are arranged between the first sliding sleeve corresponding to the position above the liquid inlet hole and the lower connector, and the second sealing rings are arranged between the first sliding sleeve corresponding to the position below the liquid inlet hole and the lower connector.
The above-mentioned still can include the third sealing washer, is equipped with the third sealing washer between the second sliding sleeve that corresponds the jet orifice upper position of the top position and the sprayer body, is equipped with the third sealing washer between the second sliding sleeve that corresponds the jet orifice lower position of the bottommost position and the sprayer body.
The sprayer body outer side corresponding to each spray hole position is provided with an arc mounting groove, the arc mounting groove is internally and fixedly provided with an anti-splashing lining block matched with the arc mounting groove, the anti-splashing lining block corresponding to the spray hole position is provided with a mounting hole communicated with the inside and the outside, the inner side of the outer end of the mounting hole is provided with a mounting ring groove, the spray hole is internally and fixedly provided with a spray nozzle pressing cap, the outer end of the spray nozzle pressing cap is provided with an outer ring platform positioned in the mounting ring groove, the inner side of the outer end of the spray nozzle pressing cap is provided with an inner ring platform, a spray nozzle is fixedly arranged in the spray nozzle pressing cap corresponding to the inner end position of the inner ring platform, and a fourth sealing ring is arranged between the spray nozzle pressing cap corresponding to the inner end.
The ball injection device is reasonable and compact in structure and convenient to use, and the ball injection device is convenient for ball injection to start seat sealing step by arranging the first sliding sleeve and the first shear pin; the lower part of the descending first sliding sleeve is radially expanded outwards by arranging the diameter expansion ring groove, so that the pressure build-up ball continuously falls; the novel crack can be opened in different directions of the original crack net by arranging the asymmetrically distributed injection holes on the injector body; through the arrangement of the second sliding sleeve and the second shear pins, the injection holes in the injector body can be opened step by conveniently throwing the balls; by arranging the centering block, the centering thrust is ensured to be provided in the direction opposite to the spraying direction of the nozzle, and the centering device has the characteristics of stability, easiness in forming a new seam and convenience in control.
Drawings
Fig. 1 is a schematic front view structure diagram of the first embodiment.
FIG. 2 is a front, semi-sectional, schematic view of the packer of FIG. 1.
FIG. 3 is a schematic front view semi-sectional structure of an ejector according to a fourth embodiment.
FIG. 4 is a schematic sectional view of the ejector according to the second embodiment.
FIG. 5 is a schematic sectional view of the ejector according to the third embodiment in a top view.
The codes in the figures are respectively: 1 is an ejector body, 2 is a nozzle, 3 is a nozzle pressing cap, 4 is an anti-splashing lining block, 5 is a mounting ring groove, 6 is an outer ring table, 7 is an inner ring table, 8 is an overflowing channel, 9 is an injection hole, 10 is a second sliding sleeve, 11 is a second shear pin, 12 is a third sealing ring, 13 is a fourth sealing ring, 14 is a first centering block, 15 is a second centering block, 16 is a third centering block, 17 is a fourth centering block, 18 is a fifth centering block, 19 is an upper joint, 20 is a central pipe, 21 is a lower joint, 22 is a liquid inlet hole, 23 is an expanding ring groove, 24 is a sealing sleeve, 25 is an elastic claw, 26 is an outer rubber cylinder, 27 is an inner rubber cylinder, 28 is a supporting bar, 29 is an upper rubber cylinder seat, 30 is a lower rubber cylinder seat, 31 is a connecting part, 32 is a floating part, 33 is a sliding block, 34 is a limiting retaining ring, 35 is a limiting screw, 36 is a first shear pin, 37 is a sealing ring table, and 38 is a first sealing ring, 39 is a second sealing ring, 40 is a continuous oil pipe, 41 is a hydraulic anchor, 42 is a well completion sliding sleeve, 43 is a check valve, 44 is a screen pipe, 45 is a guide head, 46 is a sleeve, 47 is a straddle nipple, and 48 is a centralizer.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention is further described with reference to the following examples and figures:
the first embodiment is as follows: as shown in attached figures 1, 2, 3, 4 and 5, the step-by-step directional hydraulic jet layered fracturing string comprises a hydraulic anchor 41, a well completion sliding sleeve 42, a step-by-step fracturing assembly, a check valve 43, a sieve tube 44 and a guide head 45 which are connected in series from top to bottom on a continuous oil pipe 40, wherein the step-by-step fracturing assembly comprises at least two fracturing components which are connected in series from top to bottom, each fracturing component comprises a packer, a cross-over oil pipe, a centralizer 48 and an ejector which are connected in series from top to bottom, each packer comprises an upper joint 19, a central pipe 20, a lower joint 21, a rubber tube device and a first sliding sleeve, the outer side of the upper part of the central pipe 20 is fixedly provided with the upper joint 19, the outer side of the lower part of the central pipe 20 is fixedly provided with the lower joint 21, the outer side of the middle part of the central pipe 20 is provided with the rubber tube assembly capable of, a first sliding sleeve with the lower part radially and inwardly contracted is fixedly arranged on the inner side of the lower joint 21 corresponding to the position of the liquid inlet hole 22 through a first shear pin 36, the upper end of the first sliding sleeve is positioned above the liquid inlet hole 22, the lower end of the first sliding sleeve is positioned below the liquid inlet hole 22, and an expanding ring groove 23 is arranged on the inner side of the middle part of the lower joint 21 corresponding to the position below the first sliding sleeve; the sprayer includes sprayer body 1, nozzle 2 and second sliding sleeve 10, the passageway 8 that overflows that link up from top to bottom is equipped with in the sprayer body 1, the interval distribution has two at least injection holes 9 that can communicate with the passageway 8 that overflows about the circumferencial direction in the 1 outside of sprayer body, equal fixed mounting has nozzle 2 in the injection hole 9, through 11 fixed mounting of second shear pin there is second sliding sleeve 10 in the passageway 8 that overflows, the 10 upper ends of second sliding sleeve are located the injection hole 9 top of the position of the top, 10 lower extremes of second sliding sleeve are located the injection hole 9 below of the position of the bottom.
According to the requirement, the distance from the lower end of the first sliding sleeve to the upper end of the diameter-expanding ring groove 23 is a first distance, the distance from the upper end of the first sliding sleeve to the liquid inlet hole 22 is a second distance, the first distance is larger than the second distance, and the arrangement that the first distance is larger than the second distance prevents the lower end of the first sliding sleeve from contacting with the lower end face of the diameter-expanding ring groove 23 when the first sliding sleeve moves downwards, and the liquid inlet hole 22 is still blocked by the first sliding sleeve; 2-3 injection holes 9 are formed in the injector body 1, a nozzle 2 with a large aperture is installed in the injection hole 9, the nozzle 2 is designed in a 75-150-degree asymmetric angle working face distribution mode, the diameter of the nozzle 2 is 14-16 mm, the nozzle 2 is made of existing known materials and can be made of high-strength hard alloy, the bending resistance exceeds 2300N/mm, the hardness exceeds HRA90 degrees, the nozzle 2 is subjected to precision grinding and surface treatment, the hole roughness is Ra0.1, the roughness at two ends R is Ra0.025, the inner hole of the nozzle 2 is designed in a streamline mode, the sand liquid flow of the single nozzle 2 is not less than 2.5 m/min, the injection speed is not less than 200m/s, and the performance requirement that the accumulated sand amount is not less than 200m can be met; additionally, the packer setting principle of the present invention is well known in the art and may be the same as the packer setting of the K344 type expandable packer.
In the using process, the step-by-step fracturing assembly comprises a plurality of fracturing assemblies which are connected in series from top to bottom, the inner diameters of the first sliding sleeves at the lower positions are smaller than those of the first sliding sleeves adjacent to the first sliding sleeves at the upper positions, the inner diameters of the second sliding sleeves 10 at the lower positions are smaller than those of the second sliding sleeves 10 adjacent to the second sliding sleeves at the upper positions, in the same fracturing assembly, the inner diameters of the second sliding sleeves 10 are smaller than those of the first sliding sleeves, and the fracturing balls used by the fracturing assemblies can pass through the first sliding sleeves and cannot pass through the second sliding sleeves 10; in addition, the first and second slips 10 may not be provided in the fracturing assembly at the lowermost position; the liquid inlet hole 22 is sealed by the first sliding sleeve, the liquid inlet hole 22 is opened by the first sliding sleeve after the first shear pin 36 is sheared by pitching, and the liquid in the embodiment flows out of the liquid inlet hole 22 to seal the rubber barrel assembly; through multiple ball throwing, the ball diameter of the successively thrown pressure-holding ball is matched with the inner diameter of the first sliding sleeve from bottom to top, the thrown pressure-holding ball cuts the first shear pin 36 on the first sliding sleeve at the corresponding position and then opens the liquid inlet hole 22, so that the embodiment at the position completes seat sealing on the production layer where the pressure-holding ball is positioned, and therefore through multiple ball throwing, the step-by-step perforation fracturing of the production layer is controlled; in addition, the pressure-building ball which is firstly put into the embodiment can directly pass through the first sliding sleeve which is arranged above the pressure-building ball due to small ball diameter, and the first shear pin 36 at the position can not be cut off, so that only the first shear pin 36 of the first sliding sleeve which is matched with the lower part of the pipe column can be cut off, and the step-by-step setting can be realized; in a similar way, sand blasting perforation step by step is realized through the cooperation of the pressure building ball, the second sliding sleeve 10 and the second shear pin 11.
In this embodiment, two fracturing assemblies are taken as an example, and the specific implementation process is as follows:
firstly, drifting the well to a fracturing layer position, fixedly connecting a continuous oil pipe 40, a hydraulic anchor 41, a well completion sliding sleeve 42, an upper fracturing assembly, a lower fracturing assembly, a check valve 43, a sieve pipe 44 and a guide head 45 together from top to bottom to form the embodiment, lowering the embodiment to a designed depth in the well, determining the lowering depth through a depth correction short section on the continuous oil pipe 40, and positioning an ejector of the upper fracturing assembly and an ejector of the lower fracturing assembly to a formation perforation position;
secondly, a first pressure-building ball matched with the lower fracturing component is thrown in from the continuous oil pipe 40 and injects well liquid, when the first pressure-building ball descends to a first sliding sleeve of the lower fracturing component, the first pressure-building ball cannot penetrate through the first sliding sleeve due to the fact that the lower portion of the first sliding sleeve contracts inwards in the radial direction, pressurization is continued, the first pressure-building ball cuts the first shear pin 36 and pushes the first sliding sleeve to descend, when the lower portion of the first sliding sleeve enters the diameter-expanding annular groove 23, the lower portion of the first sliding sleeve expands outwards in the radial direction, the liquid inlet hole 22 of the central pipe 20 is exposed at the moment, a packer of the lower fracturing component is sealed, and the first pressure-building ball continues to descend to be seated at the upper end of a second sliding sleeve 10 of the lower fracturing component;
thirdly, continuously pressurizing, wherein a pressure-holding ball cuts off a second shear pin 11 and pushes a second sliding sleeve 10 to stop downwards and seal the coiled tubing 40 below an injector of the lower fracturing assembly, so that a jet hole 9 is exposed, a packer of the lower fracturing assembly seals an oil sleeve annulus above a perforation position, the pressure-holding ball seals the coiled tubing 40 below the injector of the lower fracturing assembly, well fluid is replaced by sand-carrying fluid, sand-blasting perforation and fracturing operation of the formation perforation position of the lower fracturing assembly are carried out, after sand-blasting perforation and fracturing operation of the formation perforation position of the lower fracturing assembly, the sand-carrying fluid is stopped being injected into the coiled tubing 40, and the packer of the lower fracturing assembly is unsealed;
fourthly, feeding a second pressure-building ball matched with the upper fracturing assembly from the continuous oil pipe 40 and injecting well fluid, when the second pressure-building ball descends to the first sliding sleeve of the upper fracturing assembly, because the lower part of the first sliding sleeve contracts inwards in the radial direction, the second pressure-building ball cannot penetrate through the first sliding sleeve and continues to pressurize, the second pressure-building ball cuts the first shear pin 36 and pushes the first sliding sleeve to descend, when the lower part of the first sliding sleeve enters the diameter-expanding annular groove 23, the lower part of the first sliding sleeve expands outwards in the radial direction, at the moment, the liquid inlet hole 22 of the central pipe 20 is exposed, the packer of the upper fracturing assembly realizes seat sealing, and the second pressure-building ball continues to descend to be seated at the upper end of the second sliding sleeve 10 of the upper fracturing assembly;
and fifthly, continuously pressurizing, wherein a second pressure-holding ball shears the second shear pin 11 and pushes the second sliding sleeve 10 to stop downwards and seal the coiled tubing 40 below the injector of the upper fracturing assembly, so that the injection hole 9 is exposed, the packer of the upper fracturing assembly seals the annular space of the oil sleeve above the perforation position, the second pressure-holding ball seals the coiled tubing 40 below the injector of the upper fracturing assembly, well fluid is replaced by sand-carrying fluid, sand-blasting perforation and fracturing operation of the formation perforation position of the upper fracturing assembly are carried out, after the sand-blasting perforation and fracturing operation of the formation perforation position of the upper fracturing assembly, the sand-carrying fluid is stopped being injected into the coiled tubing 40, and the packer of the upper fracturing assembly is unsealed.
The step-by-step directional hydraulic jet separate-layer fracturing string can be further optimized or/and improved according to actual needs:
as shown in fig. 1, 2, 3, 4, and 5, the device can further include an upper fixing assembly, a lower floating assembly, and a limiting assembly, wherein the rubber cylinder assembly includes an outer rubber cylinder 26, an inner rubber cylinder 27, and support bars 28, the outer side of the middle portion of the central tube 20 is sleeved with the inner rubber cylinder 27, the outer side of the inner rubber cylinder 27 is uniformly provided with at least two support bars 28 along the circumference, the upper end of each support bar 28 is fixedly installed together with the corresponding position of the outer side of the upper end of the inner rubber cylinder 27, the lower end of each support bar 28 is fixedly installed together with the corresponding position of the outer side of the lower end of the inner rubber cylinder 27, the outer rubber cylinder 26 is sleeved on the outer side of the middle portion of the inner rubber; the upper end of the inner rubber tube 27 is fixedly installed together with the upper joint 19 through an upper fixing assembly, the lower end of the inner rubber tube 27 is fixedly installed with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint 21, and the outer side of the middle part of the lower joint 21 corresponding to the lower position of the lower floating assembly is fixedly installed with a limiting component. In the use process, the lower floating assembly can move up and down axially relative to the lower joint 21 through the arrangement, so that the lower floating assembly is pushed to move upwards under the action of liquid, and under the condition that the upper end of the rubber cylinder assembly is fixed, the liquid flowing into the upper part of the lower floating assembly and the expansion gap can enable the middle part of the supporting strip 28 to bulge outwards, so that the seat sealing of the embodiment is realized.
As shown in fig. 1, 2, 3, 4 and 5, the upper fixing device may include an upper rubber cylinder seat 29, the outer side of the lower end of the upper joint 19 is fixedly provided with the upper rubber cylinder seat 29, and the inner side of the lower end of the upper rubber cylinder seat 29 is fixedly installed with the inner rubber cylinder 27; the lower floating assembly comprises a lower rubber cylinder seat 30, a floating sleeve and a first sealing ring 38, the floating sleeve with the upper part positioned above the lower joint 21 is arranged on the outer side of the middle part of the lower joint 21, the floating sleeve comprises a connecting part 31 and a floating part 32, the outer side of the upper end of the connecting part 31 is fixedly installed with the inner side of the upper end of the floating part 32, the lower end of the inner rubber cylinder 27 is fixedly installed with the lower rubber cylinder seat 30 sleeved on the outer side of the lower part of the central tube 20, the inner side of the lower end of the lower rubber cylinder seat 30 is fixedly installed with the outer side of the connecting part 31, the outer side of the upper part of the lower joint 21 corresponding to the lower part of the liquid inlet hole 22 is provided with a sealing ring table 37, the inner side of the upper end of the floating part 32 corresponding to the upper part of the sealing ring table 37 is provided with a sliding vertical groove, the outer side of the upper end of the sliding block 21 is fixedly installed with a sliding block 33, at least one first sealing ring 38 is arranged between the sealing ring table 37 and the floating sleeve at intervals up and down; the limiting assembly comprises a limiting stop ring 34 and a limiting screw 35, the limiting stop ring 34 is arranged on the outer side of the middle part of the lower joint 21 corresponding to the lower position of the lower floating assembly, and the limiting stop ring 34 is fixedly installed together with the lower joint 21 through the limiting screw 35. In the using process, the upper end of the rubber cylinder assembly is convenient to fix by arranging the upper rubber cylinder seat 29; the floating sleeve can axially move up and down relative to the lower joint 21 by arranging the lower floating assembly, so that the floating sleeve is pushed to move upwards under the action of liquid, and the middle parts of the supporting bars 28 can be protruded outwards by the liquid flowing into the upward moving and expansion gaps of the floating sleeve under the condition that the upper end of the rubber cylinder assembly is fixed, so that the seat seal of the embodiment is realized; in addition, due to the arrangement of the sealing ring platform 37 and the first sealing ring 38, the liquid flowing into the space between the floating sleeve and the lower joint 21 from the liquid inlet hole 22 cannot flow downwards but only flows upwards, so that the liquid pressure acts on the lower end surface of the connecting part 31 to realize the upward movement of the floating sleeve, and the liquid flowing out of the liquid inlet hole 22 can better push the floating sleeve to move upwards and flow into the expansion gap to expand the inner rubber sleeve 27, thereby completing the seat seal of the embodiment; by providing the limit stop ring 34, the floating sleeve is prevented from slipping off the lower end of the lower joint 21.
Example two: as shown in fig. 1, 2, 3 and 4, the right side of the upper part of the injector body 1 is provided with a jet hole 9, and the front side of the lower part of the injector is provided with a jet hole 9; the axis of the injection hole 9 at the right side is a first axis, the projection of the first axis on the horizontal plane is a first projection, the axis of the injection hole 9 at the front side is a second axis, the projection of the second axis on the horizontal plane is a second projection, the included angle between the first projection and the second projection is a first included angle, and the first included angle is between 75 degrees and 150 degrees. In the use, through such setting, avoid two nozzles 2 that set up on this embodiment sprayer body 1 along the circumference equipartition, form new seam after asymmetric nozzle 2 sprays when being convenient for fracturing from this.
As shown in fig. 1, 2, 3, and 4, the injector further includes a first centering block 14 and a second centering block 15, the first centering block 14 and the second centering block 15 are disposed at intervals on the left rear side of the injector body 1 corresponding to the position between the injection holes 9, the angular bisector of the first included angle is a symmetry line, the projection of the first centering block 14 on the horizontal plane is a third projection, the projection of the second centering block 15 on the horizontal plane is a fourth projection, and the third projection and the fourth projection are symmetrical along the symmetry line. In use, by providing the first and second centralizing blocks 14, 15, it is ensured that a centralizing thrust is provided in the opposite direction to the jetting direction of the nozzle 2.
As shown in fig. 1, 2, 3 and 4, the first included angle is 90 °. In the use process, through such setting, avoid two nozzles 2 that set up on this embodiment sprayer body 1 along the circumference equipartition, form new seam when being convenient for fracture from this.
Example three: as shown in fig. 1, 2, 3 and 5, the right side of the upper part of the injector body 1 is provided with a jet hole 9, the front side of the middle part of the injector is provided with the jet hole 9, and the left rear side of the lower part of the injector body 1 is provided with the jet hole 9; the axis of the injection hole 9 positioned at the right side is a third axis, the projection of the third axis on the horizontal plane is a sixth projection, the axis of the injection hole 9 positioned at the front side is a fourth axis, the projection of the fourth axis on the horizontal plane is a seventh projection, the axis of the injection hole 9 positioned at the left rear side is a fifth axis, and the projection of the fifth axis on the horizontal plane is an eighth projection; an included angle between the sixth projection and the seventh projection is a second included angle, the second included angle is between 75 degrees and 150 degrees, an included angle between the seventh projection and the eighth projection is a third included angle, the third included angle is between 75 degrees and 150 degrees, an included angle between the eighth projection and the sixth projection is a fourth included angle, and the fourth included angle is between 75 degrees and 150 degrees. In the use, through such setting, avoid the three nozzle 2 that sets up on this embodiment sprayer body 1 along the circumference equipartition, form new seam after asymmetric nozzle 2 sprays when being convenient for fracturing from this.
As shown in fig. 1, 2, 3 and 5, the injector further comprises a third centering block 16, a fourth centering block 17 and a fifth centering block 18, the third centering block 16 is arranged on the left side of the injector body 1 corresponding to the injection hole 9 at the right side position, the fourth centering block 17 is arranged on the rear side of the injector body 1 corresponding to the injection hole 9 at the front side position, and the fifth centering block 18 is arranged on the right front side of the injector body 1 corresponding to the injection hole 9 at the left rear side position. In use, by providing the third 16, fourth 17 and fifth 18 centralizing blocks, it is ensured that a centralizing thrust is provided in the opposite direction to the injection direction of the nozzle 2.
As shown in the attached drawings 1, 2, 3 and 5, the second included angle is 90 degrees, the third included angle is 135 degrees, the fourth included angle is 135 degrees in the using process, and through the arrangement, the three nozzles 2 arranged on the ejector body 1 of the embodiment are prevented from being uniformly distributed along the circumference, so that a new seam is formed during fracturing.
Example four: as shown in fig. 1, 2, 3, 4 and 5, the first sliding sleeve includes a plugging sleeve 24, elastic claws 25 and a second sealing ring 39, the upper end of the plugging sleeve 24 is located above the liquid inlet hole 22, the lower end of the plugging sleeve 24 is located below the liquid inlet hole 22, the elastic claws 25 are fixedly installed at the lower end of the plugging sleeve 24 at intervals along the circumferential direction, a limiting boss is arranged on the outer side of the lower end of each elastic claw 25, the second sealing ring 39 is arranged between the first sliding sleeve corresponding to the position above the liquid inlet hole 22 and the lower joint 21, and the second sealing ring 39 is arranged between the first sliding sleeve corresponding to the position below the liquid inlet hole 22 and the lower joint 21. In the using process, before the first shear pin 36 is sheared, the outer side of the limiting boss is in contact with the inner side of the lower connector 21, so that the elastic claw 25 cannot expand radially outwards, namely the lower part of the first sliding sleeve is in a circular truncated cone shape with a large upper part and a small lower part, after the first shear pin 36 is sheared, the first sliding sleeve moves downwards along with the pressure-building ball, when the limiting boss enters the diameter-expanding annular groove 23, the elastic claw 25 expands radially outwards, the pressure-building ball slips from the lower end of the elastic claw 25 and enters the lower pipe string, and under the action of the diameter-expanding annular groove 23, the lower side of the diameter-expanding annular groove 23 is in contact with the lower end of the limiting boss, so that the first sliding sleeve enters the lower pipe string along with the pressure-building ball and.
As shown in fig. 1, 2, 3, 4 and 5, the injector further comprises a third sealing ring 12, the third sealing ring 12 is arranged between the second sliding sleeve 10 corresponding to the position above the injection hole 9 at the uppermost position and the injector body 1, and the third sealing ring 12 is arranged between the second sliding sleeve 10 corresponding to the position below the injection hole 9 at the lowermost position and the injector body 1. In the use process, the second sliding sleeve 10 is prevented from moving downwards, and the sand carrying liquid flows out of the nozzle 2 due to poor sealing effect.
As shown in fig. 1, 2, 3, 4 and 5, further comprises a nozzle pressure cap 3, an anti-splash lining block 4 and a fourth sealing ring 13, the outer side of the ejector body 1 corresponding to each spray hole 9 is provided with an arc-shaped mounting groove, an anti-splashing lining block 4 matched with the arc-shaped mounting groove is fixedly arranged in the arc-shaped mounting groove, the anti-splashing lining block 4 corresponding to the position of the jet hole 9 is provided with a mounting hole which is communicated with the inside and the outside, the inner side of the outer end of the mounting hole is provided with a mounting ring groove 5, the jet hole 9 is internally and fixedly provided with a jet nozzle pressing cap 3 the outer end of which is positioned in the mounting hole, the outer end of the jet nozzle pressing cap 3 is provided with an outer ring platform 6 positioned in the mounting ring groove 5, the inner side of the outer end of the jet nozzle pressing cap 3 is, the nozzle 2 is fixedly arranged in the nozzle pressing cap 3 corresponding to the inner end position of the inner annular platform 7, and a fourth sealing ring 13 is arranged between the nozzle pressing cap 3 corresponding to the inner end position of the outer annular platform 6 and the anti-splashing lining block 4. In the use process, the anti-splash lining blocks 4 are arranged, so that the damage to tools caused by high-speed sand liquid rotational flow and anti-splash at the outlet of the nozzle 2 is reduced, and the service life of the directional hydraulic ejector is prolonged; by providing the fourth seal ring 13, the flow rate and the injection speed of the nozzle 2 are prevented from being affected by poor sealing performance. The anti-splash pad 4 is made of a material known in the art, such as cemented carbide, as required.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. A step-by-step directional hydraulic jet layered fracturing string is characterized by comprising a hydraulic anchor, a well completion sliding sleeve, a step-by-step fracturing assembly, a check valve, a sieve tube and a guide head which are connected in series on a continuous oil tube from top to bottom, wherein the step-by-step fracturing assembly comprises at least two fracturing components which are connected in series from top to bottom, each fracturing component comprises a packer, a cross-over oil tube, a centralizer and an ejector which are connected in series from top to bottom, each packer comprises an upper joint, a central tube, a lower joint, a rubber sleeve device and a first sliding sleeve, an upper joint is fixedly arranged on the outer side of the upper part of the central tube, a lower joint is fixedly arranged on the outer side of the lower part of the central tube, a rubber sleeve assembly with expandable liquid inlet is arranged on the outer side of the middle part of the central tube, an expansion gap is arranged between the rubber sleeve assembly and the central tube, a liquid inlet through which the inner tube and the outer tube, the upper end of the first sliding sleeve is positioned above the liquid inlet hole, the lower end of the first sliding sleeve is positioned below the liquid inlet hole, and an expanding ring groove is formed in the inner side of the middle of the lower connector corresponding to the position below the first sliding sleeve; the sprayer includes sprayer body, nozzle and second sliding sleeve, and this internal overflow channel that link up from top to bottom that is equipped with of sprayer, the sprayer body outside along circumferencial direction interval distribution about have at least two can with overflow the jet orifice of passageway intercommunication, equal fixed mounting has the nozzle in the jet orifice, through second shear pin fixed mounting have the second sliding sleeve in the overflow channel, the second sliding sleeve upper end is located the jet orifice top of the position of the top, the second sliding sleeve lower extreme is located the jet orifice below of the position of the bottom.
2. The staged directional hydraulic jet layered fracturing string as recited in claim 1, further comprising an upper fixing assembly, a lower floating assembly and a limiting assembly, wherein the rubber sleeve assembly comprises an outer rubber sleeve, an inner rubber sleeve and supporting bars, the outer side of the middle part of the central tube is sleeved with the inner rubber sleeve, at least two supporting bars are uniformly distributed on the outer side of the inner rubber sleeve along the circumference, the upper ends of the supporting bars are fixedly installed together with the outer side of the upper end of the inner rubber sleeve at corresponding positions, the lower ends of the supporting bars are fixedly installed together with the outer side of the lower end of the inner rubber sleeve at corresponding positions, the outer rubber sleeve is sleeved on the outer side of the middle part of the inner rubber sleeve, and the inner side of the middle part of the outer; the upper end of the inner rubber cylinder is fixedly arranged together with the upper joint through an upper fixing assembly, the lower end of the inner rubber cylinder is fixedly provided with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint, and the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly is fixedly provided with a limiting assembly.
3. The staged-oriented hydraulic jet layered fracturing string as recited in claim 2, wherein the upper fixing device comprises an upper rubber cylinder base, the outer side of the lower end of the upper joint is fixedly provided with the upper rubber cylinder base, and the inner side of the lower end of the upper rubber cylinder base is fixedly arranged with the inner rubber cylinder; the lower floating assembly comprises a lower rubber cylinder seat, a floating sleeve and a first sealing ring, the outer side of the middle part of the lower joint is provided with the floating sleeve, the upper part of the floating sleeve is positioned above the lower rubber cylinder seat, the floating sleeve comprises a connecting part and a floating part, the outer side of the upper end of the connecting part is fixedly installed with the inner side of the upper end of the floating part, the lower rubber cylinder seat sleeved on the outer side of the lower part of the central pipe is fixedly installed at the lower end of the inner rubber cylinder, the inner side of the lower end of, a sealing ring table is arranged on the outer side of the upper part of the lower joint corresponding to the position below the liquid inlet hole, a sliding vertical groove is arranged on the inner side of the upper end of the floating part corresponding to the position above the sealing ring table, a sliding block is fixedly installed on the outer side of the upper end of the lower joint, the outer end of the sliding block is positioned in the sliding vertical groove, at least one first sealing ring is arranged between the lower rubber cylinder seat and the connecting part at an upper-lower interval, at least one first sealing ring is arranged between the lower joint and the central pipe at an upper-lower interval, and at least one first sealing ring is arranged between the; the limiting assembly comprises a limiting stop ring and a limiting screw, the limiting stop ring is arranged on the outer side of the middle part of the lower connector corresponding to the lower position of the floating assembly, and the limiting stop ring is fixedly installed together with the lower connector through the limiting screw.
4. The staged directional hydraulic jet layered fracturing string as claimed in claim 1, 2 or 3, wherein the right side of the upper part of the injector body is provided with jet holes, and the front side of the lower part of the injector is provided with jet holes; the axis of the injection hole at the right side is a first axis, the projection of the first axis on the horizontal plane is a first projection, the axis of the injection hole at the front side is a second axis, the projection of the second axis on the horizontal plane is a second projection, the included angle between the first projection and the second projection is a first included angle, and the first included angle is 75-150 degrees.
5. The staged directional hydraulic jet layered fracturing string as recited in claim 4, further comprising a first centering block and a second centering block, wherein the first centering block and the second centering block are arranged at intervals on the left rear side of the injector body corresponding to the positions between the jet holes, the angular bisector of the first included angle is a symmetry line, the projection of the first centering block on the horizontal plane is a third projection, the projection of the second centering block on the horizontal plane is a fourth projection, and the third projection and the fourth projection are symmetrical along the symmetry line; or/and the first included angle is 90 degrees.
6. The staged directional hydraulic jet layered fracturing string as claimed in claim 1, 2 or 3, wherein the right side of the upper part of the injector body is provided with jet holes, the front side of the middle part of the injector is provided with jet holes, and the left rear side of the lower part of the injector body is provided with jet holes; the axis of the injection hole positioned at the right side is a third axis, the projection of the third axis on the horizontal plane is a sixth projection, the axis of the injection hole positioned at the front side is a fourth axis, the projection of the fourth axis on the horizontal plane is a seventh projection, the axis of the injection hole positioned at the left rear side is a fifth axis, and the projection of the fifth axis on the horizontal plane is an eighth projection; an included angle between the sixth projection and the seventh projection is a second included angle, the second included angle is between 75 degrees and 150 degrees, an included angle between the seventh projection and the eighth projection is a third included angle, the third included angle is between 75 degrees and 150 degrees, an included angle between the eighth projection and the sixth projection is a fourth included angle, and the fourth included angle is between 75 degrees and 150 degrees.
7. The staged directional hydrajetting staged fracturing string according to claim 6, further comprising a third centering block, a fourth centering block and a fifth centering block, wherein the third centering block is disposed on the left side of the injector body corresponding to the position of the right side jet hole, the fourth centering block is disposed on the rear side of the injector body corresponding to the position of the front side jet hole, and the fifth centering block is disposed on the right front side of the injector body corresponding to the position of the left rear jet hole; or/and the second included angle is 90 degrees, the third included angle is 135 degrees, and the fourth included angle is 135 degrees.
8. The staged directional hydraulic jet layered fracturing string as claimed in claim 1, 2, 3, 5 or 7, wherein the first sliding sleeve comprises a plugging sleeve, elastic claws and second sealing rings, the upper end of the plugging sleeve is located above the liquid inlet hole, the lower end of the plugging sleeve is located below the liquid inlet hole, the elastic claws are fixedly installed at the lower end of the plugging sleeve at intervals along the circumferential direction, a limiting boss is arranged on the outer side of the lower end of each elastic claw, the second sealing ring is arranged between the first sliding sleeve corresponding to the position above the liquid inlet hole and the lower joint, and the second sealing ring is arranged between the first sliding sleeve corresponding to the position below the liquid inlet hole and the lower joint; the third sealing ring is arranged between the second sliding sleeve corresponding to the position above the jet hole at the uppermost position and the injector body, and the third sealing ring is arranged between the second sliding sleeve corresponding to the position below the jet hole at the lowermost position and the injector body; and/or the sprayer further comprises a nozzle pressing cap, an anti-reverse-splashing lining block and a fourth sealing ring, wherein an arc-shaped mounting groove is formed in the outer side of the sprayer body corresponding to each spray hole, the arc-shaped mounting groove is internally and fixedly provided with the anti-reverse-splashing lining block matched with the arc-shaped mounting groove, the anti-reverse-splashing lining block corresponding to the spray hole is provided with a mounting hole which is communicated with the inside and the outside, a mounting ring groove is formed in the inner side of the outer end of the mounting hole, the nozzle pressing cap with the outer end located in the mounting hole is fixedly mounted in the spray hole, an outer ring platform located in the mounting ring groove is arranged at the outer end of the nozzle pressing cap, an inner ring platform is arranged on the inner side of the outer end of the nozzle pressing cap, a nozzle.
9. The staged fracturing string as recited in claim 4, wherein the first sliding sleeve comprises a plugging sleeve, elastic claws and second sealing rings, the upper end of the plugging sleeve is located above the liquid inlet hole, the lower end of the plugging sleeve is located below the liquid inlet hole, the elastic claws are fixedly installed at the lower end of the plugging sleeve along the circumferential direction at intervals, a limiting boss is arranged on the outer side of the lower end of each elastic claw, the second sealing ring is arranged between the first sliding sleeve corresponding to the position above the liquid inlet hole and the lower joint, and the second sealing ring is arranged between the first sliding sleeve corresponding to the position below the liquid inlet hole and the lower joint; the third sealing ring is arranged between the second sliding sleeve corresponding to the position above the jet hole at the uppermost position and the injector body, and the third sealing ring is arranged between the second sliding sleeve corresponding to the position below the jet hole at the lowermost position and the injector body; and/or the sprayer further comprises a nozzle pressing cap, an anti-reverse-splashing lining block and a fourth sealing ring, wherein an arc-shaped mounting groove is formed in the outer side of the sprayer body corresponding to each spray hole, the arc-shaped mounting groove is internally and fixedly provided with the anti-reverse-splashing lining block matched with the arc-shaped mounting groove, the anti-reverse-splashing lining block corresponding to the spray hole is provided with a mounting hole which is communicated with the inside and the outside, a mounting ring groove is formed in the inner side of the outer end of the mounting hole, the nozzle pressing cap with the outer end located in the mounting hole is fixedly mounted in the spray hole, an outer ring platform located in the mounting ring groove is arranged at the outer end of the nozzle pressing cap, an inner ring platform is arranged on the inner side of the outer end of the nozzle pressing cap, a nozzle.
10. The staged fracturing string as recited in claim 6, wherein the first sliding sleeve comprises a plugging sleeve, elastic claws and second sealing rings, the upper end of the plugging sleeve is located above the liquid inlet hole, the lower end of the plugging sleeve is located below the liquid inlet hole, the elastic claws are fixedly installed at the lower end of the plugging sleeve along the circumferential direction at intervals, a limiting boss is arranged on the outer side of the lower end of each elastic claw, the second sealing ring is arranged between the first sliding sleeve corresponding to the position above the liquid inlet hole and the lower joint, and the second sealing ring is arranged between the first sliding sleeve corresponding to the position below the liquid inlet hole and the lower joint; the third sealing ring is arranged between the second sliding sleeve corresponding to the position above the jet hole at the uppermost position and the injector body, and the third sealing ring is arranged between the second sliding sleeve corresponding to the position below the jet hole at the lowermost position and the injector body; and/or the sprayer further comprises a nozzle pressing cap, an anti-reverse-splashing lining block and a fourth sealing ring, wherein an arc-shaped mounting groove is formed in the outer side of the sprayer body corresponding to each spray hole, the arc-shaped mounting groove is internally and fixedly provided with the anti-reverse-splashing lining block matched with the arc-shaped mounting groove, the anti-reverse-splashing lining block corresponding to the spray hole is provided with a mounting hole which is communicated with the inside and the outside, a mounting ring groove is formed in the inner side of the outer end of the mounting hole, the nozzle pressing cap with the outer end located in the mounting hole is fixedly mounted in the spray hole, an outer ring platform located in the mounting ring groove is arranged at the outer end of the nozzle pressing cap, an inner ring platform is arranged on the inner side of the outer end of the nozzle pressing cap, a nozzle.
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| CN114876370A (en) * | 2022-06-01 | 2022-08-09 | 中国石油大学(北京) | Multi-point directional jet drilling tool and method of use |
| CN115704294A (en) * | 2021-08-17 | 2023-02-17 | 中国石油天然气集团有限公司 | Water injection fracturing integrated detachable packer |
| RU2796373C1 (en) * | 2022-07-27 | 2023-05-22 | Алексей Юрьевич Михайлов | Water sand blast perforator with hydraulic action packer |
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| CN113417636A (en) * | 2021-05-31 | 2021-09-21 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing process for comb-shaped layer-through directional long-drilling branch hole coal seam section |
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| CN114876370B (en) * | 2022-06-01 | 2023-03-28 | 中国石油大学(北京) | Multi-point directional jet drilling tool and method of use thereof |
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Application publication date: 20200811 |