CN105715225A - Step-by-step pressure-guide packer, step-by-step pressure-guide layering fracturing device and fracturing method - Google Patents

Step-by-step pressure-guide packer, step-by-step pressure-guide layering fracturing device and fracturing method Download PDF

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Publication number
CN105715225A
CN105715225A CN201410725335.XA CN201410725335A CN105715225A CN 105715225 A CN105715225 A CN 105715225A CN 201410725335 A CN201410725335 A CN 201410725335A CN 105715225 A CN105715225 A CN 105715225A
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packer
grades
packers
fracturing fluid
sliding sleeve
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赵华
凌毅立
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Ids New Tech Co Ltd
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Ids New Tech Co Ltd
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Abstract

The invention discloses a step-by-step pressure-guide packer, a step-by-step pressure-guide layering fracturing device and a fracturing method, relates to the technical field of oil exploitation, and solves the technical problem that in the prior art, the state of a packer in the fracturing process cannot be observed from the ground. The step-by-step pressure-guide packer comprises a packer main body, a seat seal sliding sleeve, a sand blasting sliding sleeve and an elastic member, wherein a seat seal pressure-guide hole and a sand blasting hole are formed in the packer main body; the seat seal sliding sleeve is connected with the packer main body through a shear pin; after the shear pin is cut off, the seat seal sliding sleeve can slide to a position where the seat seal pressure-guide hole is opened; the sand blasting sliding sleeve is connected with the packer main body through another shear pin; after the latter shear pin is cut off, the sand blasting sliding sleeve can slide to a position where the sand blasting hole is opened. The step-by-step pressure-guide layering fracturing device comprises a tube column, a sleeve and a throttle nozzle, wherein the tube column is at least provided with two stages of the packer disclosed by the invention. By adopting the step-by-step pressure-guide packer, the step-by-step pressure-guide layering fracturing operation efficiency and reliability can be improved.

Description

Pilot packer, step by step pilot multiple fracturing device and fracturing process step by step
Technical field
The present invention relates to technical field of petroleum extraction, particularly relate to a kind of packer of pilot step by step, the separate stratum fracfturing method of pilot step by step of this is set multiple fracturing device of pilot step by step of pilot packer and application thereof step by step.
Background technology
It is the yield-increasing technique method commonly used in oilfield development process that Oil/gas Well is once implemented multi-layer fracturing, it is the economic means that by applying fracturing string, multilamellar is implemented pressure break in oil field development produces, becomes one of main process technology in oilfield development process for a long time.The methods such as the main current limiting pressure break of separate stratum fracfturing of usual employing, abrasive perforating separate stratum fracfturing, pitching separate stratum fracfturing.These methods are when carrying out separate stratum fracfturing construction, by fluid control hierarchy or adopt packer that the layering of each fractured interval carried out pressure break, and the main process method that to adopt packer to carry out being layered be current applied range, layering efficiency is high.When adopting packer to carry out separate stratum fracfturing construction, the main method of layering is after packer setting, by putting into the control ball of different-diameter from ground, open sanding machine sliding sleeve in the middle of packer respectively and monolayer is implemented pressure break, after completing one layer of fracture acidizing, put into the control ball of different-diameter again, open another group sanding machine sliding sleeve and monolayer is implemented fracture acidizing, complete the pressure break to each interval according to this.Owing to adopting disposable set packer separate stratum fracfturing process, oil pipe is closed by multiple-string packer with casing annulus, the packing state of most upper level packer can only be observed from oil jacket annular space, the packing state of the following multiple-string packer of upper packer cannot be verified, cannot to the packer in the middle part of tubing string and fractured interval injection balance pressure during pressure break, in fracturing process, processing from the observation in time of oil jacket annular space when interlayer pressure is altered occurs in fracture extension, and also exists and is unfavorable for diagnosis and analyzes the deficiency of pressure break state.In order to solve above deficiency, develop employing K344 expanded type packer stepped setting successively fracturing technology method in recent years, install additional at K344 packer setting inlet and set sliding sleeve, control packer setting inlet at different levels and pressure break sand jet outlet, by opening packer setting mouth sliding sleeve from ground input control ball, sliding sleeve falls to pressure break sand jet outlet sliding sleeve and opens sand jet outlet sliding sleeve, it is achieved stepped setting is separate stratum fracfturing successively.
Applicants have discovered that: prior art at least exists techniques below problem:
Owing to stepped setting successively fracturing technology method adopts K344 expanded type packer to realize its function, pressure is set in order to provide to packer, must setting up inside and outside tubing string in pressing crack construction process and set pressure reduction accordingly and could realize packer setting, this pressure is that the throttling exported by sanding machine is formed.The method that this employing sand jet outlet nozzle carries out throttling, pressure break is taken sand flow body and is sprayed from sanding machine nozzle at high speeds, the crushing having not only resulted in tubing string self increases, the high speed at sand jet outlet place takes the internal surface of casing that the jet of sand flow body is emitted directly toward in well, cause great infringement to Oil/gas Well sleeve pipe, be particularly easily caused casing pipe hole opening during the construction of big liquid measure and destroy.This directly infringement to the Oil/gas Well life-span, makes the application of stepped setting successively fracturing technology method be restricted.And develop the K344 pilot separate stratum fracfturing technique of application in recent years, the method managing interior throat bushing is taked to realize the process that pipe internal segment conductance pressure sets and opens sand jet outlet successively pressure break step by step, on the one hand being subject in tubing string the restriction of latus rectum and throat bushing, the pressure break controlled to change bulb diameter is layered the number of plies and is restricted；When pressure break, pilot packer is disposable on the other hand all sets, it is impossible to realize stepped setting separate stratum fracfturing, it is impossible to pressure break state is carried out observation analysis.
Summary of the invention
One of them purpose of the present invention is the separate stratum fracfturing method of pilot step by step proposing a kind of packer of pilot step by step, step by step pilot multiple fracturing device and application thereof, and solving that prior art exists cannot the technical problem of packing state from ground observation fracturing process.Many technique effects that optimal technical scheme in many technical schemes provided by the invention can be generated by (can from annular space to upper packer and fractured layer injection balance pressure, without sand jet outlet pressure drop and the fracturing fluid that flows out from sand jet outlet, sleeve pipe is harmless, stepped setting successively pressure break can be realized and there is high anti-sticking performance) elaboration as detailed below.
For achieving the above object, the invention provides techniques below scheme:
The pilot packer step by step that the embodiment of the present invention provides, including packer body, sets sliding sleeve, sand blast sliding sleeve and elasticity part, wherein:
Described packer body is circle body shape, and is provided with and sets pilot port and sand jet outlet；
Described set sliding sleeve block described in set pilot port, described in set sliding sleeve be connected with described packer body and this be connected release after described in set sliding sleeve can slide into open described in set the position of pilot port；Described elasticity part is fixedly installed on described packer body, and described in set and set, by described, the liquid outer wall that described elasticity part can be driven to expand and protrude described packer body that pilot port enters after pilot port is opened；
Described sand blast sliding sleeve sandblasts mouth described in blocking, described sand blast sliding sleeve be connected with described packer body and this be connected release after described sand blast sliding sleeve can slide into open described in sandblast the position of mouth.
The pilot multiple fracturing device step by step that the embodiment of the present invention provides, including tubing string, sleeve pipe and flow nipple, described tubing string is positioned at described sleeve pipe and there is gap between the two, and described sleeve pipe is from the bottom up at least provided with one layer of fracturing fluid outlet and two layers of fracturing fluid outlet, wherein:
Described tubing string is provided with packer, and the sand jet outlet of described one-level packer exports towards described two layers of fracturing fluid；Described packer includes one-level packer and two grades of packers, the pilot packer step by step that described two grades of packers provide for any technology scheme of the present invention；One-level packer can be set sliding sleeve opening or be not provided with set sliding sleeve pilot packer step by step.
Described flow nipple includes first segment stem bar, and the control rod of described first segment stem bar is plugged on the throat bushing of described first segment stem bar；
After putting into described first segment stem bar in described tubing string and passing into fracturing fluid, described first segment stem bar can drive the sliding sleeve that sets of described two grades of packers to move to expose the pilot port that sets of described two grades of packers and make to be driven the elasticity part of described two grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described two grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described first segment stem bar can also come downwards under described of the fracturing fluid driving the throat bushing that makes described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the throat bushing that the control rod of described first segment stem bar departs from described first segment stem bar be opened by the sand blast sliding sleeve of described one-level packer under of the fracturing fluid driving by the control rod of described first segment stem bar, expose the sand jet outlet of described one-level packer so that flowing into described two layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
In preferably or alternatively embodiment, the bottom of described tubing string is additionally provided with end sanding machine, the restriction of described end sanding machine close to or towards described one layer of fracturing fluid outlet；
After passing into fracturing fluid in described tubing string, the fracturing fluid flowed out by the restriction of described end sanding machine can flow out from described one layer of fracturing fluid outlet, and the elasticity part of described one-level packer can be driven to expand and abut by the fracturing fluid setting pilot port entrance of described one-level packer, set on the inwall of described sleeve pipe；
The control rod of described first segment stem bar can also block the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine when being opened by the sand blast sliding sleeve of described one-level packer under of the fracturing fluid driving.
In preferably or alternatively embodiment, described sleeve pipe is additionally provided with the outlet of three layers fracturing fluid, and the position height of described three layers fracturing fluid outlet is higher than described two layers of fracturing fluid outlet；
Described packer also includes three grades of packers, and the position height of described three grades of packers is higher than described two grades of packers；The pilot packer step by step that described three grades of packers provide for any technology scheme of the present invention；
Described flow nipple also includes second section stem bar, and the control rod of described second section stem bar is plugged on the throat bushing of described second section stem bar；
After putting into described second section stem bar in described tubing string and passing into fracturing fluid, described second section stem bar can drive the sliding sleeve that sets of described three grades of packers to move to expose the pilot port that sets of described three grades of packers and make to be driven the elasticity part of described three grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described three grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described second section stem bar can also come downwards under described of the fracturing fluid driving the throat bushing that makes described second section stem bar on the flow nipple seat on described two grades of packers close to or towards the sand jet outlet of described two grades of packers and make the control rod of described second section stem bar depart from the throat bushing of described second section stem bar to be blocked the fracturing fluid passage between described two grades of packers and the throat bushing of described first segment stem bar under of the fracturing fluid driving by the control rod of described second section stem bar and opened by the sand blast sliding sleeve of described two grades of packers, expose the sand jet outlet of described two grades of packers so that flowing into the outlet of described three layers fracturing fluid through the fracturing fluid of the throat bushing of described second section stem bar from the sand jet outlet of described two grades of packers.
In preferably or alternatively embodiment, described sleeve pipe is additionally provided with four layers of fracturing fluids outlet, and the position height of described four layers of fracturing fluid outlet is higher than the outlet of described three layers fracturing fluid；
Described packer also includes level Four packer, and the position height of described level Four packer is higher than described three grades of packers；Described level Four packer can adopt the pilot packer step by step without sand jet outlet.
Described flow nipple also includes the 3rd flow nipple, and the control rod of described 3rd flow nipple is plugged on the throat bushing of described 3rd flow nipple；
After putting into described 3rd flow nipple in described tubing string and passing into fracturing fluid, described 3rd flow nipple can drive the sliding sleeve that sets of described level Four packer to move to expose the pilot port that sets of described level Four packer and make to be driven the elasticity part of described level Four packer expand and abut by the fracturing fluid that pilot port enters that sets of described level Four packer under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described 3rd flow nipple can also come downwards under described of the fracturing fluid driving the throat bushing that makes described 3rd flow nipple on the flow nipple seat on described three grades of packers close to or towards the sand jet outlet of described three grades of packers and make the control rod of described 3rd flow nipple depart from the throat bushing of described 3rd flow nipple to be blocked the fracturing fluid passage between described three grades of packers and the throat bushing of described second section stem bar under of the fracturing fluid driving by the control rod of described 3rd flow nipple and opened by the sand blast sliding sleeve of described three grades of packers, expose the sand jet outlet of described three grades of packers so that flowing into described four layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described 3rd flow nipple from the sand jet outlet of described three grades of packers.
In preferably or alternatively embodiment, described flow nipple also includes the 4th flow nipple, after putting into described 4th flow nipple in described tubing string and passing into fracturing fluid, what described 4th flow nipple can shelter from described level Four packer under described of the fracturing fluid driving sets pilot port.
In preferably or alternatively embodiment, described elasticity part is sebific duct.
In preferably or alternatively embodiment, described two grades of packers, described three grades of packers and described level Four packer each all include packer body and set sliding sleeve, described two grades of packers, described three grades of packers and the respective pilot port that sets of described level Four packer are arranged on described two grades of packers, on described three grades of packers and the described respective packer body of level Four packer, and described two grades of packers, described three grades of packers and respective sliding sleeve and the described two grades of packers of setting of described level Four packer, pass through to cut off between described three grades of packers and the described respective packer body of level Four packer to be connected, wherein:
Described first segment stem bar can be cut off to cut off described between the packer body setting sliding sleeve and described two grades of packers of described two grades of packers under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described two grades of packers set pilot port with what open described two grades of packers；
Described second section stem bar can be cut off to cut off described between the packer body setting sliding sleeve and described three grades of packers of described three grades of packers under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described three grades of packers set pilot port with what open described three grades of packers；
Described 3rd flow nipple can be cut off to cut off described between the packer body setting sliding sleeve and described level Four packer of described level Four packer under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described level Four packer set pilot port with what open described level Four packer.
In preferably or alternatively embodiment, described one-level packer, described two grades of packers and described three grades of packers each all include packer body and sand blast sliding sleeve, described one-level packer, described two grades of packers and described three grades of respective sand jet outlets of packer are arranged on described one-level packer, on described two grades of packers and described three grades of respective packer bodies of packer, and described one-level packer, described two grades of packers and described three grades of respective sand blast sliding sleeves of packer and described one-level packer, pass through to cut off between described two grades of packers and described three grades of respective packer bodies of packer to be connected, wherein:
The control rod of described first segment stem bar can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described one-level packer described between the sand blast sliding sleeve of described one-level packer and the packer body of described one-level packer to open described one-level packer under described of the fracturing fluid driving；
The control rod of described second section stem bar can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described two grades of packers described between the sand blast sliding sleeve of described two grades of packers and the packer body of described two grades of packers to open described two grades of packers under described of the fracturing fluid driving；
The control rod of described 3rd flow nipple can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described three grades of packers described between the sand blast sliding sleeve of described three grades of packers and the packer body of described three grades of packers to open described three grades of packers under described of the fracturing fluid driving.
In preferably or alternatively embodiment, described first segment stem bar, described second section stem bar and the described 3rd respective throat bushing of flow nipple all include throat bushing and the lower throat bushing abutted against with described upper throat bushing；
In same flow nipple, described control rod is plugged in described upper throat bushing and described lower throat bushing, and after described control rod departs from described upper throat bushing and described lower throat bushing, the lower port of described lower throat bushing forms the liquid outlet of flow nipple；
The upper throat bushing of described first segment stem bar can come downwards under described of the fracturing fluid driving the lower port of the lower throat bushing making described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the control rod of described first segment stem bar depart from the lower port of the upper throat bushing of described first segment stem bar and the lower throat bushing of described first segment stem bar to be blocked the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine by the control rod of described first segment stem bar under of the fracturing fluid driving and the sand blast sliding sleeve of described one-level packer opened, exposed the sand jet outlet of described one-level packer so that flowing into described two layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
In preferably or alternatively embodiment, in same described packer, the internal diameter of sand blast sliding sleeve is less than the internal diameter of flow nipple seat；
In two adjacent described packers, the internal diameter of the sand blast sliding sleeve of the described packer that the internal diameter of the sand blast sliding sleeve of the described packer that position height is relatively low is higher more than or less than position height, the internal diameter setting sliding sleeve of different described packers is identical；
The external diameter of the throat bushing of each described flow nipple is more than the external diameter of the control rod of this flow nipple, and the external diameter of throat bushing of each described flow nipple and the external diameter of control rod are all higher than the internal diameter of described sand blast sliding sleeve of the described packer at flow nipple seat place coordinated with this flow nipple.
In preferably or alternatively embodiment, the top of described tubing string is additionally provided with hydraulic anchor, the anchor fluke of described hydraulic anchor can in described tubing string the inwall of sleeve pipe described in clamping under of the fracturing fluid driving；
Be additionally provided with hydraulic tubing anchor outside the sanding machine of described end, described hydraulic tubing anchor can under the driving of hydraulic oil tubing string described in grappling.
The separate stratum fracfturing method of pilot step by step of the multiple fracturing device of the pilot step by step application that the embodiment of the present invention provides, comprises the following steps:
S1, to ground floor implement pressure break:
After passing into fracturing fluid in tubing string, the fracturing fluid flowed out by the restriction of end sanding machine flows out from one layer of fracturing fluid outlet, and is expanded and abut by the elasticity part setting the fracturing fluid described one-level packer of driving that pilot port enters of one-level packer, being set on the inwall of sleeve pipe；
S2, to the second layer implement pressure break:
After putting into first segment stem bar in described tubing string and passing into fracturing fluid, described first segment stem bar drives the sliding sleeve that sets of two grades of packers to move to expose the pilot port that sets of described two grades of packers and make to be driven the elasticity part of described two grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described two grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described first segment stem bar also come downwards under described of the fracturing fluid driving the throat bushing that makes described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the control rod of described first segment stem bar depart from the throat bushing of described first segment stem bar to be blocked the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine by the control rod of described first segment stem bar under of the fracturing fluid driving and opened by the sand blast sliding sleeve of described one-level packer, expose the sand jet outlet of described one-level packer so that flowing into two layers of fracturing fluids outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
In preferably or alternatively embodiment, the described separate stratum fracfturing method of pilot step by step is further comprising the steps of:
S3, to third layer implement pressure break:
After putting into second section stem bar in described tubing string and passing into fracturing fluid, described second section stem bar drives the sliding sleeve that sets of three grades of packers to move to expose the pilot port that sets of described three grades of packers and make to be driven the elasticity part of described three grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described three grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described second section stem bar also come downwards under described of the fracturing fluid driving the throat bushing that makes described second section stem bar on the flow nipple seat on described two grades of packers close to or towards the sand jet outlet of described two grades of packers and make the control rod of described second section stem bar depart from the throat bushing of described second section stem bar to be blocked the fracturing fluid passage between described two grades of packers and the throat bushing of described first segment stem bar under of the fracturing fluid driving by the control rod of described second section stem bar and opened by the sand blast sliding sleeve of described two grades of packers, expose the sand jet outlet of described two grades of packers so that flowing into the outlet of described three layers fracturing fluid through the fracturing fluid of the throat bushing of described second section stem bar from the sand jet outlet of described two grades of packers.
In preferably or alternatively embodiment, the described separate stratum fracfturing method of pilot step by step is further comprising the steps of:
S4, to the 4th layer implement pressure break:
After putting into the 3rd flow nipple in described tubing string and passing into fracturing fluid, described 3rd flow nipple drives the sliding sleeve that sets of level Four packer to move to expose the pilot port that sets of described level Four packer and make to be driven the elasticity part of described level Four packer expand and abut by the fracturing fluid that pilot port enters that sets of described level Four packer under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described 3rd flow nipple also come downwards under described of the fracturing fluid driving the throat bushing that makes described 3rd flow nipple on the flow nipple seat on described three grades of packers close to or towards the sand jet outlet of described three grades of packers and make the control rod of described 3rd flow nipple depart from the throat bushing of described 3rd flow nipple to be blocked the fracturing fluid passage between described three grades of packers and the throat bushing of described second section stem bar under of the fracturing fluid driving by the control rod of described 3rd flow nipple and opened by the sand blast sliding sleeve of described three grades of packers, expose the sand jet outlet of described three grades of packers so that flowing into four layers of fracturing fluids outlet through the fracturing fluid of the throat bushing of described 3rd flow nipple from the sand jet outlet of described three grades of packers.
Based on technique scheme, the embodiment of the present invention at least can produce following technique effect:
The change of the packing state the situation Real Time Observation fracturing process that the present invention can expand from the elasticity part (be preferably packing element) in gap between ground observation tubing string and sleeve pipe, set, cannot the technical problem of packing state from ground observation fracturing process so solving that prior art exists, and then can take measures to overcome the fault of appearance in time, thus can ensure that fracturing work is smooth, high efficiency to carry out, many technique effects elaboration as detailed below that the optimal technical scheme in many technical schemes provided by the invention can be generated by.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
The schematic diagram of the key component of the multiple fracturing device of pilot step by step that Fig. 1 provides for the embodiment of the present invention；
The tubing string that Fig. 2 provides for the embodiment of the present invention arranges the schematic diagram of the part of two grades of packers or three grades of packers；
Accompanying drawing labelling: 1, top connection；2, filter screen；3, throttling muzzle；4, packing；5, packing；6, flow nipple seat；7, flow nipple；8, anti-rotation pin；9, packing；10, ball seat；11, sliding sleeve；12, packing；13, shear pin；14, main body；15, packing；16, packing；17, upper steel bowl；18, packing element；19, central canal；20, lower contact；21, lower steel bowl；22, anticollision ring；31, tubing string；32, safety joint；33, hydraulic anchor；34, the 4th flow nipple；35, level Four packer；36, connected pipes；37, safety joint；38, the 3rd flow nipple；39, three grades of packers；310, connected pipes；311, safety joint；312, second section stem bar；313, two grades of packers；314, connected pipes；315, safety joint；316, first segment stem bar；317, one-level packer；318, hydraulic tubing anchor；319, end sanding machine；320, sleeve pipe；321, one layer of fracturing fluid outlet；322, two layers of fracturing fluid outlet；323, three layers fracturing fluid outlet；324, four layers of fracturing fluid outlet.
Detailed description of the invention
It is referred to accompanying drawing Fig. 1～Fig. 2 below and word content understands the distinctive points between present disclosure and the present invention and prior art.Hereafter by the mode of accompanying drawing and some alternative embodiments enumerating the present invention, technical scheme (including optimal technical scheme) is described in further detail.It should be understood that any technical characteristic in the present embodiment, any technical scheme is all one or more in the technical characteristic of plurality of optional or optional technical scheme, cannot all alternative technical characteristic of the exhaustive present invention and alternative technical scheme in order to describe succinct need in presents, also the embodiment being not easy to each technical characteristic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: any technology means provided by the invention can be replaced or any two provided by the invention or more technological means or technical characteristic are combined mutually and obtain new technical scheme.Any technical characteristic and any technical scheme in the present embodiment are all not intended to protection scope of the present invention, protection scope of the present invention should include those skilled in the art do not pay creative work thinkable any alternate embodiments and those skilled in the art new technical scheme that any two provided by the invention or more technological means or technical characteristic are combined mutually and obtain.
Embodiments provide one have pressure break whole process can from ground observation insulate state, can from annular space to upper packer and fractured layer injection balance pressure, without sand jet outlet pressure drop and the fracturing fluid that flows out from sand jet outlet, sleeve pipe is harmless, stepped setting successively pressure break can be realized and there is the packer of pilot step by step of high anti-sticking performance, the separate stratum fracfturing method of pilot step by step of this multiple fracturing device of pilot step by step of pilot packer and application thereof step by step is set.
Below in conjunction with Fig. 1～Fig. 2, technical scheme provided by the invention is carried out elaboration specifically.
As shown in Fig. 1～Fig. 2, the pilot packer step by step that the embodiment of the present invention provides, including packer body, set sliding sleeve, sand blast sliding sleeve and elasticity part (being preferably packing element), wherein: packer body is circle body shape, and be provided with and set pilot port and sand jet outlet；Set sliding sleeve to block and set pilot port, set sliding sleeve be connected with packer body (preferably by cutting off) and this be connected releasing after set sliding sleeve and can slide into and open the position setting pilot port；Elasticity part is fixedly installed on packer body, and set after pilot port is opened by set pilot port enter liquid elasticity part can be driven to expand and protrude the outer wall of packer body；
Sand blast sliding sleeve blocks the mouth that sandblasts, sand blast sliding sleeve be connected with packer body (preferably by cutting off) and this be connected releasing after sand blast sliding sleeve can slide into the position opening the mouth that sandblasts.
Set pilot port and be preferably located at the top of sand jet outlet.
The multiple fracturing device of pilot step by step that the embodiment of the present invention provides includes tubing string 31, sleeve pipe 320 and flow nipple, tubing string 31 is positioned at sleeve pipe 320 and there is gap between the two, sleeve pipe 320 exports 321 and two layers of (second layer) fracturing fluid outlet 322 from the bottom up at least provided with one layer of (ground floor) fracturing fluid, wherein:
Tubing string 31 is at least provided with packer, and tubing string 31 bottom is preferably and is additionally provided with end sanding machine 319.The restriction of end sanding machine 319 is close or exports 321 towards one layer of fracturing fluid.
Packer at least includes one-level packer 317 and two grades of packers 313, and two grades of packers 313 are pilot packer step by step, it is preferred to K344 is pilot packer step by step.The sand jet outlet of one-level packer 317 exports 322 towards two layers of fracturing fluid.One-level packer can be set sliding sleeve opening or be not provided with set sliding sleeve pilot packer step by step.
After passing into fracturing fluid in tubing string 31, the fracturing fluid flowed out by the restriction of end sanding machine 319 can export 321 outflows from one layer of fracturing fluid, and the elasticity part of two grades of packers 313 can be driven to expand and abut by the fracturing fluid setting pilot port entrance of one-level packer 317, set on the inwall of sleeve pipe 320.Said structure can realize ground floor is implemented pressure break.
Flow nipple also includes first segment stem bar 316, and the control rod of first segment stem bar 316 is plugged on the throat bushing of first segment stem bar 316.
After putting into first segment stem bar 316 in tubing string 31 and passing into fracturing fluid, first segment stem bar 316 can drive the sliding sleeve that sets of two grades of packers 313 to move to expose the pilot port that sets of (expose can be understood as and open) two grades of packers 313 and make to be driven the elasticity part of two grades of packers 313 expand and abut by the fracturing fluid that pilot port enters that sets of two grades of packers 313 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then first segment stem bar 316 can also come downwards under of the fracturing fluid driving the throat bushing that makes first segment stem bar 316 on the flow nipple seat on one-level packer 317 close to or towards the sand jet outlet of one-level packer 317 and make the control rod of first segment stem bar 316 depart from the throat bushing of first segment stem bar 316 to be blocked the fracturing fluid passage between one-level packer 317 (be specially one-level packer 317 and set the part below pilot port and sand jet outlet) and the restriction of end sanding machine 319 under of the fracturing fluid driving by the control rod of first segment stem bar 316 and opened by the sand blast sliding sleeve of one-level packer 317, expose the sand jet outlet of one-level packer 317 so that flowing into two layers of fracturing fluids outlet 322 through the fracturing fluid of the throat bushing of first segment stem bar 316 from the sand jet outlet of one-level packer 317.
Said structure can realize the second layer is implemented pressure break.
The change of the packing state the situation Real Time Observation fracturing process that the present invention can expand from elasticity part in gap between ground observation tubing string 31 and sleeve pipe 320 (be preferably packing element), set, and then take measures to overcome the fault of appearance in time, thus can ensure that fracturing work is smooth, high efficiency and carry out.
As preferably or alternatively embodiment, sleeve pipe 320 is additionally provided with three layers fracturing fluid outlet 323, and the position height of three layers fracturing fluid outlet 323 is higher than two layers of fracturing fluids outlet 322.
Packer also includes three grades of packers 39, and the position height of three grades of packers 39 is higher than two grades of packers 313.Three grades of packers 39 are pilot packer step by step, it is preferred to K344 is pilot packer step by step.
Flow nipple also includes second section stem bar 312, and the control rod of second section stem bar 312 is plugged on the throat bushing of second section stem bar 312.
After putting into second section stem bar 312 in tubing string 31 and passing into fracturing fluid, second section stem bar 312 can drive the sliding sleeve that sets of three grades of packers 39 to move to expose the pilot port that sets of three grades of packers 39 and make to be driven the elasticity part of three grades of packers 39 expand and abut by the fracturing fluid that pilot port enters that sets of three grades of packers 39 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then second section stem bar 312 can also come downwards under of the fracturing fluid driving the throat bushing that makes second section stem bar 312 on the flow nipple seat on two grades of packers 313 close to or towards the sand jet outlet of two grades of packers 313 and make the control rod of second section stem bar 312 depart from the throat bushing of second section stem bar 312 to be blocked the fracturing fluid passage between two grades of packers 313 (be specially two grades of packers 313 and set the part below pilot port and sand jet outlet) and the throat bushing of first segment stem bar 316 under of the fracturing fluid driving by the control rod of second section stem bar 312 and opened by the sand blast sliding sleeve of two grades of packers 313, expose the sand jet outlet of two grades of packers 313 so that flowing into three layers fracturing fluid outlet 323 through the fracturing fluid of the throat bushing of second section stem bar 312 from the sand jet outlet of two grades of packers 313.
Said structure can realize third layer is implemented pressure break.
As preferably or alternatively embodiment, sleeve pipe 320 is additionally provided with four layers of fracturing fluids outlet 324, and the position height of four layers of fracturing fluids outlet 324 is higher than three layers fracturing fluid outlet 323.
Packer also includes level Four packer 35, and the position height of level Four packer 35 is higher than three grades of packers 39.Level Four packer adopts the pilot packer step by step without sand jet outlet.
In use procedure, layered fracturing pipe string is formed by K344 provided by the invention pilot packer step by step, the packer of its topmost and level Four packer adopt the K344 stepped setting packer without sand jet outlet, middle and the packer that is three grade packer of bottom, two grades of packers adopt K344 pilot packer step by step step by step, wherein the packer of foot and one-level packer adopt 344 step by step pilot packer but do not assemble reducing and set sliding sleeve, pilot port is in opening, and sand blast sliding sleeve is closed.End throttling sanding machine is assembled, for the fractured layer of pressure break bottommost bottom the tubing string formed.
Flow nipple also includes the 3rd flow nipple 38, and the control rod of the 3rd flow nipple 38 is plugged on the throat bushing of the 3rd flow nipple 38.
After putting into the 3rd flow nipple 38 in tubing string 31 and passing into fracturing fluid, 3rd flow nipple 38 can drive the sliding sleeve that sets of level Four packer 35 to move to expose the pilot port that sets of level Four packer 35 and make to be driven the elasticity part of level Four packer 35 expand and abut by the fracturing fluid that pilot port enters that sets of level Four packer 35 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then the 3rd flow nipple 38 can also come downwards under of the fracturing fluid driving the throat bushing that makes the 3rd flow nipple 38 on the flow nipple seat on three grades of packers 39 close to or towards the sand jet outlet of three grades of packers 39 and make the control rod of the 3rd flow nipple 38 depart from the throat bushing of the 3rd flow nipple 38 to be blocked the fracturing fluid passage between three grades of packers 39 (be specially three grades of packers 39 and set the part below pilot port and sand jet outlet) and the throat bushing of second section stem bar 312 by the control rod of the 3rd flow nipple 38 under of the fracturing fluid driving and opened by the sand blast sliding sleeve of three grades of packers 39, expose the sand jet outlet of three grades of packers 39 so that flowing into four layers of fracturing fluids outlet 324 through the fracturing fluid of the throat bushing of the 3rd flow nipple 38 from the sand jet outlet of three grades of packers 39.
Said structure can realize implementing pressure break to the 4th layer.It is, of course, also possible to increase the number of said structure as required to realize layer 5 or even more multi-layered enforcement pressure break.
As preferably or alternatively embodiment, flow nipple also includes the 4th flow nipple 34, and after putting into the 4th flow nipple 34 in tubing string 31 and passing into fracturing fluid, the 4th flow nipple 34 can shelter from level Four under of the fracturing fluid driving and set pilot port.4th flow nipple 34 can maintain the elasticity part of level Four packer 35 and be in the state of setting.
As preferably or alternatively embodiment, elasticity part is sebific duct.Sebific duct has good springiness, sets reliable, it is simple to the advantage of installation.
As preferably or alternatively embodiment, 313, three grades of packers 39 of two grades of packers and level Four packer 35 each all include packer body and set sliding sleeve, set pilot port to be arranged on packer body, and set and be connected by cutting off between sliding sleeve with packer body, wherein:
First segment stem bar 316 can cut off cutting off between the packer body setting sliding sleeve and two grades of packers 313 of two grades of packers 313 under of the fracturing fluid driving makes the sliding sleeve slides downwards that sets of two grades of packers 313 set pilot port with what open two grades of packers 313.
Second section stem bar 312 can cut off cutting off between the packer body setting sliding sleeve and three grades of packers 39 of three grades of packers 39 under of the fracturing fluid driving makes the sliding sleeve slides downwards that sets of three grades of packers 39 set pilot port with what open three grades of packers 39.
3rd flow nipple 38 can cut off cutting off between the packer body setting sliding sleeve and level Four packer 35 of level Four packer 35 under of the fracturing fluid driving makes the sliding sleeve slides downwards that sets of level Four packer 35 set pilot port with what open level Four packer 35.
Said structure packer body and set between sliding sleeve adopt cut off connection, have be easily installed, compact conformation, it is easy to the advantage control, cut off.
As preferably or alternatively embodiment, 317, two grades of packers 313 of one-level packer and three grades of packers 39 each all include packer body and sand blast sliding sleeve, sand jet outlet is arranged on packer body, and passes through to cut off between sand blast sliding sleeve with packer body to be connected, wherein:
The control rod of first segment stem bar 316 can be cut off cutting off between the sand blast sliding sleeve of one-level packer 317 and the packer body of one-level packer 317 under of the fracturing fluid driving and make the sand blast sliding sleeve downslide of one-level packer 317 sand jet outlet to open one-level packer 317.
The control rod of second section stem bar 312 can be cut off cutting off between the sand blast sliding sleeve of two grades of packers 313 and the packer body of two grades of packers 313 under of the fracturing fluid driving and make the sand blast sliding sleeve downslide of two grades of packers 313 sand jet outlet to open two grades of packers 313.
The control rod of the 3rd flow nipple 38 can be cut off cutting off between the sand blast sliding sleeve of three grades of packers 39 and the packer body of three grades of packers 39 under of the fracturing fluid driving and make the sand blast sliding sleeve downslide of three grades of packers 39 sand jet outlet to open three grades of packers 39.
Between said structure packer body and sand blast sliding sleeve adopt cut off connection, have be easily installed, compact conformation, it is easy to the advantage control, cut off.
As preferably or alternatively embodiment, first segment stem bar 316, second section stem bar 312 and the 3rd respective throat bushing of flow nipple 38 all include throat bushing and the lower throat bushing abutted against with upper throat bushing；
In same flow nipple, control rod is plugged in throat bushing and lower throat bushing, and after control rod departs from upper throat bushing and lower throat bushing, the lower port of lower throat bushing forms the liquid outlet of flow nipple；Specifically, the throat bushing of first segment stem bar 316 include throat bushing on first and with first on first time throat bushing abutting against of throat bushing, the control rod of first segment stem bar 316 is plugged on first throat bushing and in first time throat bushing, and the lower port of first time throat bushing forms the liquid outlet of first segment stem bar 316.
On first throat bushing can come downwards under of the fracturing fluid driving the lower port that makes first time throat bushing on the flow nipple seat on one-level packer 317 close to or towards the sand jet outlet of one-level packer 317 and make the control rod of first segment stem bar 316 depart from the lower port of throat bushing and first time throat bushing on first to be blocked the fracturing fluid passage between one-level packer 317 (be specially one-level packer 317 and set the part below pilot port and sand jet outlet) and the restriction of end sanding machine 319 under of the fracturing fluid driving by the control rod of first segment stem bar 316 and the sand blast sliding sleeve of one-level packer 317 is opened, exposed the sand jet outlet of one-level packer 317 export 322 so that flowing into two layers of fracturing fluid through the fracturing fluid of the throat bushing of first segment stem bar 316 from the sand jet outlet of one-level packer 317.
Said structure can adopt the multiple control operation of enforcement step by step of a throat bushing.The structure of the throat bushing of second section stem bar 312 and the throat bushing of the 3rd flow nipple 38 is similar to the throat bushing of first segment stem bar 316, and only size is distinct, repeats no more herein.
As preferably or alternatively embodiment, in same packer, the internal diameter of sand blast sliding sleeve is less than the internal diameter of flow nipple seat.
In two adjacent packers, the internal diameter of the sand blast sliding sleeve of the packer of the internal diameter higher more than position height (upper level in two-stage packer) of the sand blast sliding sleeve of the packer of position height relatively low (next stage in two-stage packer), the internal diameter setting sliding sleeve of different packers is identical.
The external diameter of the throat bushing of each flow nipple is more than the external diameter of the control rod of this flow nipple, and the external diameter of the external diameter of the throat bushing of each flow nipple and control rod is all higher than the internal diameter of sand blast sliding sleeve of the packer at flow nipple seat place coordinated with this flow nipple.
Said structure may insure that each step of pilot separate stratum fracfturing step by step is smoothly, implement reliably.
K344 provided by the invention pilot packer step by step when being applied to separate stratum fracfturing, reducing set sliding sleeve, throttle seat, sand blast sliding sleeve internal diameter compound mode carry out according to below scheme.During internal diameter combination, sand blast sliding sleeve internal diameter at the corresponding levels is less than throttle seat 3mm, the sand blast sliding sleeve 6mm bigger than the sand sliding sleeve internal diameter of upper level of next stage, and upper level reducing sets sliding sleeve internal diameter equal to next stage sand blast sliding sleeve internal diameter.Being applied to control the composite throttling set of this combination, throat bushing external diameter is more than sand blast sliding sleeve 5mm, and internal controller external diameter is more than the internal diameter 2mm of sand blast sliding sleeve.By changing the internal diameter of throat bushing in the composite throttling set put into, reach to regulate choke pressure requirement.
As preferably or alternatively embodiment, the top of tubing string 31 is additionally provided with hydraulic anchor 33, the anchor fluke of hydraulic anchor 33 can in tubing string 31 inwall of clamping sleeve pipe 320 under of the fracturing fluid driving.
Be additionally provided with hydraulic tubing anchor 318 outside end sanding machine 319, hydraulic tubing anchor 318 can under the driving of hydraulic oil anchoring string 31.
Tubing string 31 can be securely fixed to guarantee the smooth enforcement of fracturing work by hydraulic anchor 33 and hydraulic tubing anchor 318.
The separate stratum fracfturing method of pilot step by step of the multiple fracturing device of the pilot step by step application that the embodiment of the present invention provides, comprises the following steps:
S1, to ground floor implement pressure break:
After passing into fracturing fluid in tubing string 31, the fracturing fluid flowed out by the restriction of end sanding machine 319 exports 321 outflows from one layer of fracturing fluid, and is expanded and abut by the elasticity part setting the fracturing fluid driving one-level packer 317 that pilot port enters of one-level packer 317, being set on the inwall of sleeve pipe 320.
S2, to the second layer implement pressure break:
After putting into first segment stem bar 316 in tubing string 31 and passing into fracturing fluid, first segment stem bar 316 drives the sliding sleeve that sets of two grades of packers 313 to move to expose the pilot port that sets of two grades of packers 313 and make to be driven the elasticity part of two grades of packers 313 expand and abut by the fracturing fluid that pilot port enters that sets of two grades of packers 313 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then first segment stem bar 316 also come downwards under of the fracturing fluid driving the throat bushing that makes first segment stem bar 316 on the flow nipple seat on one-level packer 317 close to or towards the sand jet outlet of one-level packer 317 and make the control rod of first segment stem bar 316 depart from the throat bushing of first segment stem bar 316 to be blocked the fracturing fluid passage between one-level packer 317 (be specially one-level packer 317 and set the part below pilot port and sand jet outlet) and the restriction of end sanding machine 319 under of the fracturing fluid driving by the control rod of first segment stem bar 316 and opened by the sand blast sliding sleeve of one-level packer 317, expose the sand jet outlet of one-level packer 317 so that flowing into two layers of fracturing fluids outlet 322 through the fracturing fluid of the throat bushing of first segment stem bar 316 from the sand jet outlet of one-level packer 317.
As preferably or alternatively embodiment, pilot separate stratum fracfturing method is further comprising the steps of step by step:
S3, to third layer implement pressure break:
After putting into second section stem bar 312 in tubing string 31 and passing into fracturing fluid, second section stem bar 312 drives the sliding sleeve that sets of three grades of packers 39 to move to expose the pilot port that sets of three grades of packers 39 and make to be driven the elasticity part of three grades of packers 39 expand and abut by the fracturing fluid that pilot port enters that sets of three grades of packers 39 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then second section stem bar 312 also come downwards under of the fracturing fluid driving the throat bushing that makes second section stem bar 312 on the flow nipple seat on two grades of packers 313 close to or towards the sand jet outlet of two grades of packers 313 and make the control rod of second section stem bar 312 depart from the throat bushing of second section stem bar 312 to be blocked the fracturing fluid passage between two grades of packers 313 (be specially two grades of packers 313 and set the part below pilot port and sand jet outlet) and the throat bushing of first segment stem bar 316 under of the fracturing fluid driving by the control rod of second section stem bar 312 and opened by the sand blast sliding sleeve of two grades of packers 313, expose the sand jet outlet of two grades of packers 313 so that flowing into three layers fracturing fluid outlet 323 through the fracturing fluid of the throat bushing of second section stem bar 312 from the sand jet outlet of two grades of packers 313.
As preferably or alternatively embodiment, pilot separate stratum fracfturing method is further comprising the steps of step by step:
S4, to the 4th layer implement pressure break:
After putting into the 3rd flow nipple 38 in tubing string 31 and passing into fracturing fluid, 3rd flow nipple 38 drives the sliding sleeve that sets of level Four packer 35 to move to expose the pilot port that sets of level Four packer 35 and make to be driven the elasticity part of level Four packer 35 expand and abut by the fracturing fluid that pilot port enters that sets of level Four packer 35 under of the fracturing fluid driving, set on the inwall of sleeve pipe 320, then the 3rd flow nipple 38 also come downwards under of the fracturing fluid driving the throat bushing that makes the 3rd flow nipple 38 on the flow nipple seat on three grades of packers 39 close to or towards the sand jet outlet of three grades of packers 39 and make the control rod of the 3rd flow nipple 38 depart from the throat bushing of the 3rd flow nipple 38 to be blocked the fracturing fluid passage between three grades of packers 39 (be specially three grades of packers 39 and set the part below pilot port and sand jet outlet) and the throat bushing of second section stem bar 312 by the control rod of the 3rd flow nipple 38 under of the fracturing fluid driving and opened by the sand blast sliding sleeve of three grades of packers 39, expose the sand jet outlet of three grades of packers 39 so that flowing into four layers of fracturing fluids outlet 324 through the fracturing fluid of the throat bushing of the 3rd flow nipple 38 from the sand jet outlet of three grades of packers 39.
Below in conjunction with accompanying drawing 2, optimal technical scheme provided by the invention is described in more detail:
In the present invention, tubing string can increase middle tubing string progression structure tool according to the number of plies: regulates oil pipe, safety joint, composite throttling nozzle, K344 pilot packer step by step.
Separate stratum fracfturing time conductance is pressed method and is set order:
During pressure break ground floor, end sanding machine 319 throttles, and one-level packer 317 (being preferably K344 pilot packer step by step) sets；
During the pressure break second layer, first segment stem bar 316 (being preferably fixed restriction nozzle) throttling, one-level packer 317 (being preferably K344 pilot packer step by step) and two grades of packers 313 (being preferably K344 pilot packer step by step) set；
During pressure break third layer, second section stem bar 312 (being preferably composite throttling nozzle) throttling, two grades of packers 313 (being preferably K344 pilot packer step by step) and three grades of packers 39 set；
During pressure break napex layer (the 4th layer), the 3rd flow nipple 38 throttles, and three grades of packers 39 (being preferably K344 pilot packer step by step) and level Four packer 35 (being preferably K344 stepped setting packer) set；
Control bastinade during separate stratum fracfturing in compound throttle nozzle and open sand blast sliding sleeve order:
During pressure break ground floor, end sanding machine 319 go out liquid；
During the pressure break second layer, in first segment stem bar 316, control rod falls open one-level packer 317 (being preferably K344 pilot packer step by step) sand blast sliding sleeve；
During pressure break third layer, second section stem bar 312 (being preferably composite throttling nozzle) interior control rod falls open two grades of packers 313 (being preferably K344 pilot packer step by step) sand blast sliding sleeve；
During pressure break the 4th layer, the 3rd flow nipple 38 (being preferably composite throttling nozzle) interior control rod falls open three grades of packers 39 (being preferably K344 pilot packer step by step) sand blast sliding sleeve；
K344 of the present invention pilot separate stratum fracfturing process step by step is when carrying out separate stratum fracfturing construction operation, and the specific implementation method of on-site layering pressure break is:
During pressure break ground floor, overpressure starts hydraulic anchor 33, throttled by end sanding machine 319 formed set pressure, start through the pilot port of one-level packer 317 (being preferably K344 pilot packer step by step) and set, overpressure promotes hydraulic tubing anchor 318 anchoring string, and fracturing fluid flows out through end sanding machine 319 and carries out pressure break.
During the pressure break second layer, putting into second section stem bar 312 in oil pipe, second section stem bar 312 closes the sliding sleeve that sets of two grades of packers 313, and promotion sets the descending pilot passage opening packer of sliding sleeve and sets two grades of packers 312；Second section stem bar 312 disengages descending, run to one-level packer 317 (being preferably K344 pilot packer step by step) and be located on throttle nozzle seat, control rod disengages with throttle nozzle and sets up choke pressure, the descending sand blast sliding sleeve of opening of control rod, fracturing fluid flows out from the sand jet outlet of one-level packer 317 implements pressure break.
During pressure break third layer, the 3rd flow nipple 38 (being preferably composite throttling nozzle) is put in tubing string, the sliding sleeve that sets of three grades of packers 39 (being preferably K344 pilot packer step by step) closed by 3rd flow nipple 38, and the promotion descending pilot passage opening three grades of packers 39 of sliding sleeve sets three grades of packers 39；3rd flow nipple 38 inner downlink, runs to second section stem bar 312 and is located on throttle nozzle seat, and control rod disengages with second section stem bar 312 and sets up choke pressure, the descending sand blast sliding sleeve of opening of control rod, and fracturing fluid flows out from two grades of packer 313 sand jet outlets implements pressure break.
During pressure break the 4th layer, the 3rd flow nipple 38 (being preferably composite throttling nozzle) is put in tubing string, the sliding sleeve that sets of level Four packer 35 (being preferably K344 stepped setting packer) closed by 3rd flow nipple 38, and the promotion descending pilot passage opening level Four packer 35 of sliding sleeve sets level Four packer 35；The control rod of the 3rd flow nipple 38 disengages descending, run to three grades of packers 39 and be located on throttle nozzle seat, control rod disengages with throttle nozzle and sets up choke pressure, the descending sand blast sliding sleeve of opening of control rod, and fracturing fluid flows out from the sand jet outlet of three grades of packers 39 implements pressure break.
Hereafter concentrate and set forth optimal technical scheme provided by the invention and acquired technique effect thereof: K344 packer provided by the invention pilot separate stratum fracfturing process step by step is to overcome the deficiency that in prior art, stepped setting separate stratum fracfturing process and pilot separate stratum fracfturing process exist, K344 packer provided by the invention pilot separate stratum fracfturing process step by step, it is a kind of in K344 packer does not adopt the separate stratum fracfturing of existing sanding machine outlet throttling state to construct, the mode of pilot of throttling step by step in application pipe realizes K344 packer and extends step by step and set, thus the two-stage packer that when reaching monolayer pressure break, a setting fracture interval is upper and lower, and other packer in layered fracturing pipe string keeps not setting state, and complete to turn after lamination splits in monolayer pressure break, the automatic deblocking of the packer of fracturing section, realize the process of K344 packer pressure guiding stepped setting successively pressure break.Invention is combined into one K344 packer and frac-sand jet, sand jet outlet top composite throttling mouth throttling foundation at sanding machine sets pressure, setting pressure has the entrance sanding machine sidepiece pilot passage importing lower packer of control to realize packer setting through sliding sleeve switch valve, and the control rod of composite throttling mouth discharges the descending separate stratum fracfturing process opening sand blast sliding sleeve.Achieve timely observation analysis pressure break state in fracturing process, overcome the K344 packer layered tubing string wretched insufficiency to casing damage, make the range of application of K344 stepped setting process be expanded.
The core of K344 packer provided by the invention pilot separate stratum fracfturing process step by step is pilot method and step by step pilot control method step by step, the principle of pilot step by step of K344 packer of the present invention pilot separate stratum fracfturing process step by step is that K344 packer and frac-sand jet structurally group are united two into one, sand jet outlet top throw-in type composite throttling nozzle throttling foundation at sanding machine sets pressure, set pressure has the entrance sanding machine sidepiece pilot passage of control to enter lower packer by setting sliding sleeve switch valve, it is achieved packer stepped setting.In the separate stratum fracfturing control method applying pilot step by step, be in order to reach single controller control simultaneously fractured layer upper packer set sliding sleeve open and layer lower packer sanding machine sliding sleeve open function, input composite throttling nozzle mode is adopted to control packer pilot port and sanding machine sand blast sliding sleeve, composite throttling nozzle promotes after putting into after setting the pilot port that sliding sleeve opens layer upper packer, what composite throttling nozzle continued the descending sand blast sliding sleeve endoporus through packer at the corresponding levels and lower packer sets sliding sleeve, after being seated nozzle carrier, release control rod becomes throttling runner, control rod promotes the sand blast sliding sleeve of packer to open, thus reaching, lower two-stage packer setting confining bed top and the bottom passage, the interval needing pressure break is implemented separate stratum fracfturing.
K344 provided by the invention pilot separate stratum fracfturing process step by step have pressure break omnidistance insulate state from ground observation, the high anti-sticking feature of deblocking in time after sleeve pipe is harmless, stepped setting successively pressure break of noting balance pressure, sand jet outlet from annular space upwards layer separating packer and fractured layer and pressure.
The pilot step by step that K344 packer provided by the invention its core of pilot separate stratum fracfturing process step by step is application K344 pilot packer step by step sets function and is achieved.The structural principle of K344 pilot packer step by step is (shown in Fig. 1):
Structurally packer and sanding machine are designed as integral structure, from top to down by top connection, set sliding sleeve, throw-in type composite throttling nozzle, control rod, pressure guide hole, sand blast sliding sleeve, sandblasting pipe nipple, packing element, lower contact etc. and form.Operation principle is to take to set sliding sleeve and sand blast sliding sleeve two-stage sliding sleeve controls to set pilot port and sand jet outlet respectively, set pressure to rely on the throttle nozzle throttling foundation that sand jet outlet top puts into and set pressure, set pressure and import bottom packing element from the pilot passage of sand jet outlet sidepiece and make packing element expand to set.Throw-in type composite throttling nozzle, combined by nozzle and control rod, control rod is designed in nozzle bore, dependence composite throttling nozzle is located to set to open on sliding sleeve and sets sliding sleeve, after setting sliding sleeve unlatching, elasticity sets sliding sleeve and launches, and composite throttling nozzle is descending is located in the throttle nozzle seat into next stage packer, control rod is obstructed and throttle nozzle disengages, and opens sand blast sliding sleeve after coming downwards to sand blast sliding sleeve.Thus reaching the control purpose of pilot separate stratum fracfturing step by step.
K344 provided by the invention pilot separate stratum fracfturing process step by step is by being achieved by the layered fracturing pipe string of pilot step by step that K344 stepped setting packer and K344 pilot packer step by step combine, the topmost packer being mainly characterized by layered fracturing pipe string of tubing string adopts K344 stepped setting packer, bottom application K344 pilot packer step by step composition.The control mechanism of K344 pilot layered fracturing pipe string step by step is that to take to set sliding sleeve opening structure, middle K344 at different levels pilot packer step by step and top K344 stepped setting packer setting sliding sleeve be closing structure (such as Fig. 2) to the pilot packer step by step of the K344 bottom tubing string.First bottom interval carries out during pressure break pressure break, and bottom packer sets sliding sleeve owing to being fitted without, and under the choke pressure of lower end sanding machine, packer setting implements monolayer pressure break；After completing ground floor pressure break, first order composite throttling nozzle is put into from ground, through top, packers at different levels fall into second layer upper packer and set sliding sleeve top composite throttling nozzle, composite throttling nozzle is obstructed and closed fluid passages, the descending unlatching of sliding sleeve that sets of packer is promoted to set pilot port under hydraulic action, set sliding sleeve run put in place after, elasticity sets sliding sleeve and launches, pressure promotes composite throttling nozzle to come downwards in next stage packer nozzle carrier, nozzle is obstructed closed channel, control rod is deviate under pressure in composite throttling nozzle, under be about to the sand blast sliding sleeve of packer and open the second layer is carried out pressure break, after second layer pressure break completes, from the input second level, ground composite throttling nozzle, through top, packers at different levels fall into third layer upper packer and set sliding sleeve top composite throttling nozzle, composite throttling nozzle is obstructed and can not pass through and closed fluid passages, the descending unlatching of sliding sleeve that sets of packer is promoted to set pilot port under hydraulic action, set sliding sleeve run put in place after, elasticity sets sliding sleeve and launches, pressure promotes composite throttling nozzle to come downwards in next stage packer nozzle carrier, nozzle is obstructed closed channel, control rod is deviate under pressure in composite throttling nozzle, under be about to the sand blast sliding sleeve of packer and open the second layer is carried out pressure break, the rest may be inferred, when being depressed into last layer, put into afterbody composite throttling nozzle, composite throttling nozzle falls into top packer and sets on sliding sleeve, composite throttling nozzle is obstructed and can not pass through and closed fluid passages, the descending unlatching of sliding sleeve that sets of packer is promoted to set pilot port under hydraulic action, set sliding sleeve run put in place after, elasticity sets sliding sleeve and launches, pressure promotes composite throttling nozzle to come downwards in next stage packer nozzle carrier, nozzle is obstructed closed channel, control rod is deviate under pressure in composite throttling nozzle, under be about to the sand blast sliding sleeve of packer and open the second layer is carried out pressure break, complete the pressing crack construction of whole interval.
In sum, the invention provides a kind of in oil field layered fracturing work process, the method of pilot of taking to throttle step by step in pipe realizes K344 packer and extends step by step and set, thus reaching to carry out in separate stratum fracfturing construction in oil field, the two-stage packer that during monolayer pressure break, a setting fracture interval is upper and lower, and other packer in layered fracturing pipe string keeps not setting state, and complete to turn after lamination splits in monolayer pressure break, the automatic deblocking of the packer of fracturing section.
The core of the present invention is to set up packer setting pressure by throttling step by step in tubing string, and choke pressure utilizes the method for side opening pilot import to the packer of bottom from sanding machine top, make packer stepped setting successively pressure break when not adopting the throttling foundation of existing sand jet outlet to set pressure.K344 packer of the present invention pilot separate stratum fracfturing process step by step, mainly K344 packer and frac-sand jet are combined into one, composite throttling nozzle is put on the sand jet outlet top of sanding machine, open and set sliding sleeve switch valve, and the foundation that throttles sets pressure, set pressure and realize packer stepped setting by sanding machine sidepiece pilot passage importing lower packer.Control fractured layer upper packer simultaneously and set sliding sleeve in order to reach input control device and open and fractured layer lower packer sanding machine sliding sleeve is opened, invent composite throttling nozzle controller, for controlling the setting sliding sleeve in packer setting pilot port and sanding machine sand blast sliding sleeve, composite throttling nozzle promotes after setting the pilot port that sliding sleeve opens layer upper packer, composite throttling nozzle release control rod, control rod sets sliding sleeve through the sand blast sliding sleeve endoporus of packer at the corresponding levels and lower packer, bypass the immediate leadership and promote the sand blast sliding sleeve of lower packer to open, thus reaching, lower two-stage packer setting confining bed top and the bottom passage, the interval needing pressure break is implemented separate stratum fracfturing.This method have pressure break omnidistance insulate state from ground observation, the feature of note balance pressure, sand jet outlet from annular space to upper packer and fractured layer sleeve pipe is harmless, stepped setting successively pressure break and high anti-sticking performance.
Any technology scheme disclosed in the invention described above is unless otherwise stated, if it discloses numerical range, so disclosed numerical range is preferred numerical range, any it should be appreciated by those skilled in the art: preferred numerical range is only the numerical value that in many enforceable numerical value, technique effect is obvious or representative.Owing to numerical value is more, it is impossible to exhaustive, so the present invention just discloses component values to illustrate technical scheme, and, the above-mentioned numerical value enumerated should not constitute the restriction to the invention protection domain.
If being used herein the word such as " first ", " second " to limit parts, those skilled in the art should know: the use of " first ", " second " is intended merely to facilitate in description and parts carries out difference as not having outside Stated otherwise, and above-mentioned word does not have special implication.
Simultaneously, if the invention described above discloses or relate to parts or the structural member of connection fastened to each other, so, unless otherwise stated, fixing connection is it is to be understood that connection (such as using bolt or screw to connect) can releasably be fixed, it can be appreciated that: non-removable fixing connection (such as riveted joint, welding), certainly, connection fastened to each other can also be integral type structure (such as use casting technique is integrally formed create) replaced (substantially cannot adopt except integrally formed technique).
It addition, term its implication unless otherwise stated for representing position relationship or shape applied in any technology scheme disclosed in the invention described above includes approximate with it, similar or close state or shape.Either component provided by the invention both can be assembled by multiple independent ingredients, it is also possible to the produced separate part of the technique that is one of the forming.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；Although the present invention being described in detail with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or portion of techniques feature carries out equivalent replacement；Without deviating from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention is claimed.

Claims (15)

1. a pilot packer step by step, it is characterised in that include packer body, set sliding sleeve, sand blast sliding sleeve and elasticity part, wherein:
Described packer body is circle body shape, and is provided with and sets pilot port and sand jet outlet；
Described set sliding sleeve block described in set pilot port, described in set sliding sleeve be connected with described packer body and this be connected release after described in set sliding sleeve can slide into open described in set the position of pilot port；Described elasticity part is fixedly installed on described packer body, and described in set and set, by described, the liquid outer wall that described elasticity part can be driven to expand and protrude described packer body that pilot port enters after pilot port is opened；
Described sand blast sliding sleeve sandblasts mouth described in blocking, described sand blast sliding sleeve be connected with described packer body and this be connected release after described sand blast sliding sleeve can slide into open described in sandblast the position of mouth.
2. a pilot multiple fracturing device step by step, it is characterized in that, including tubing string, sleeve pipe and flow nipple, described tubing string is positioned at described sleeve pipe and there is gap between the two, described sleeve pipe is from the bottom up at least provided with one layer of fracturing fluid outlet and two layers of fracturing fluid outlet, wherein:
Described tubing string is provided with packer, and the sand jet outlet of described one-level packer exports towards described two layers of fracturing fluid；Described packer includes one-level packer and two grades of packers, and described two grades of packers are pilot packer step by step described in claim 1；
Described flow nipple includes first segment stem bar, and the control rod of described first segment stem bar is plugged on the throat bushing of described first segment stem bar；
After putting into described first segment stem bar in described tubing string and passing into fracturing fluid, described first segment stem bar can drive the sliding sleeve that sets of described two grades of packers to move to expose the pilot port that sets of described two grades of packers and make to be driven the elasticity part of described two grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described two grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described first segment stem bar can also come downwards under described of the fracturing fluid driving the throat bushing that makes described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the throat bushing that the control rod of described first segment stem bar departs from described first segment stem bar be opened by the sand blast sliding sleeve of described one-level packer under of the fracturing fluid driving by the control rod of described first segment stem bar, expose the sand jet outlet of described one-level packer so that flowing into described two layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
3. pilot multiple fracturing device step by step according to claim 2, it is characterised in that
The bottom of described tubing string is additionally provided with end sanding machine, and the restriction of described end sanding machine is close or exports towards described one layer of fracturing fluid；After passing into fracturing fluid in described tubing string, the fracturing fluid flowed out by the restriction of described end sanding machine can flow out from described one layer of fracturing fluid outlet, and the elasticity part of described one-level packer can be driven to expand and abut by the fracturing fluid setting pilot port entrance of described one-level packer, set on the inwall of described sleeve pipe；
The control rod of described first segment stem bar can also block the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine when being opened by the sand blast sliding sleeve of described one-level packer under of the fracturing fluid driving.
4. pilot multiple fracturing device step by step according to claim 3, it is characterised in that
Described sleeve pipe is additionally provided with the outlet of three layers fracturing fluid, and the position height of described three layers fracturing fluid outlet is higher than described two layers of fracturing fluid outlet；
Described packer also includes three grades of packers, and the position height of described three grades of packers is higher than described two grades of packers；Described three grades of packers are pilot packer step by step described in claim 1；
Described flow nipple also includes second section stem bar, and the control rod of described second section stem bar is plugged on the throat bushing of described second section stem bar；
After putting into described second section stem bar in described tubing string and passing into fracturing fluid, described second section stem bar can drive the sliding sleeve that sets of described three grades of packers to move to expose the pilot port that sets of described three grades of packers and make to be driven the elasticity part of described three grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described three grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described second section stem bar can also come downwards under described of the fracturing fluid driving the throat bushing that makes described second section stem bar on the flow nipple seat on described two grades of packers close to or towards the sand jet outlet of described two grades of packers and make the control rod of described second section stem bar depart from the throat bushing of described second section stem bar to be blocked the fracturing fluid passage between described two grades of packers and the throat bushing of described first segment stem bar under of the fracturing fluid driving by the control rod of described second section stem bar and opened by the sand blast sliding sleeve of described two grades of packers, expose the sand jet outlet of described two grades of packers so that flowing into the outlet of described three layers fracturing fluid through the fracturing fluid of the throat bushing of described second section stem bar from the sand jet outlet of described two grades of packers.
5. pilot multiple fracturing device step by step according to claim 4, it is characterised in that described sleeve pipe is additionally provided with four layers of fracturing fluid outlet, and the position height of described four layers of fracturing fluid outlet is higher than the outlet of described three layers fracturing fluid；
Described packer also includes level Four packer, and the position height of described level Four packer is higher than described three grades of packers；
Described flow nipple also includes the 3rd flow nipple, and the control rod of described 3rd flow nipple is plugged on the throat bushing of described 3rd flow nipple；
After putting into described 3rd flow nipple in described tubing string and passing into fracturing fluid, described 3rd flow nipple can drive the sliding sleeve that sets of described level Four packer to move to expose the pilot port that sets of described level Four packer and make to be driven the elasticity part of described level Four packer expand and abut by the fracturing fluid that pilot port enters that sets of described level Four packer under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described 3rd flow nipple can also come downwards under described of the fracturing fluid driving the throat bushing that makes described 3rd flow nipple on the flow nipple seat on described three grades of packers close to or towards the sand jet outlet of described three grades of packers and make the control rod of described 3rd flow nipple depart from the throat bushing of described 3rd flow nipple to be blocked the fracturing fluid passage between described three grades of packers and the throat bushing of described second section stem bar under of the fracturing fluid driving by the control rod of described 3rd flow nipple and opened by the sand blast sliding sleeve of described three grades of packers, expose the sand jet outlet of described three grades of packers so that flowing into described four layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described 3rd flow nipple from the sand jet outlet of described three grades of packers.
6. pilot multiple fracturing device step by step according to claim 5, it is characterized in that, described flow nipple also includes the 4th flow nipple, after putting into described 4th flow nipple in described tubing string and passing into fracturing fluid, what described 4th flow nipple can shelter from described level Four packer under described of the fracturing fluid driving sets pilot port.
7. pilot multiple fracturing device step by step according to claim 5, it is characterised in that described elasticity part is sebific duct.
8. pilot multiple fracturing device step by step according to claim 5, it is characterized in that, described two grades of packers, described three grades of packers and described level Four packer each all include packer body and set sliding sleeve, described two grades of packers, described three grades of packers and the respective pilot port that sets of described level Four packer are arranged on described one-level packer, on described two grades of packers and described three grades of respective packer bodies of packer, and described two grades of packers, described three grades of packers and respective sliding sleeve and the described two grades of packers of setting of described level Four packer, pass through to cut off between described three grades of packers and the described respective packer body of level Four packer to be connected, wherein:
Described first segment stem bar can be cut off to cut off described between the packer body setting sliding sleeve and described two grades of packers of described two grades of packers under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described two grades of packers set pilot port with what open described two grades of packers；
Described second section stem bar can be cut off to cut off described between the packer body setting sliding sleeve and described three grades of packers of described three grades of packers under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described three grades of packers set pilot port with what open described three grades of packers；
Described 3rd flow nipple can be cut off to cut off described between the packer body setting sliding sleeve and described level Four packer of described level Four packer under described of the fracturing fluid driving and make the sliding sleeve slides downwards that sets of described level Four packer set pilot port with what open described level Four packer.
9. pilot multiple fracturing device step by step according to claim 5, it is characterised in that
Described one-level packer, described two grades of packers and described three grades of packers each all include packer body and sand blast sliding sleeve, described one-level packer, described two grades of packers and described three grades of respective sand jet outlets of packer are arranged on described one-level packer, on described two grades of packers and described three grades of respective packer bodies of packer, and described one-level packer, described two grades of packers and described three grades of respective sand blast sliding sleeves of packer and described one-level packer, pass through to cut off between described two grades of packers and described three grades of respective packer bodies of packer to be connected, wherein:
The control rod of described first segment stem bar can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described one-level packer described between the sand blast sliding sleeve of described one-level packer and the packer body of described one-level packer to open described one-level packer under described of the fracturing fluid driving；
The control rod of described second section stem bar can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described two grades of packers described between the sand blast sliding sleeve of described two grades of packers and the packer body of described two grades of packers to open described two grades of packers under described of the fracturing fluid driving；
The control rod of described 3rd flow nipple can cut off the sand jet outlet cutting off the sand blast sliding sleeve downslide making described three grades of packers described between the sand blast sliding sleeve of described three grades of packers and the packer body of described three grades of packers to open described three grades of packers under described of the fracturing fluid driving.
10. according to the arbitrary described pilot multiple fracturing device step by step of claim 5-9, it is characterized in that, described first segment stem bar, described second section stem bar and the described 3rd respective throat bushing of flow nipple all include throat bushing and the lower throat bushing abutted against with described upper throat bushing；
In same flow nipple, described control rod is plugged in described upper throat bushing and described lower throat bushing, and after described control rod departs from described upper throat bushing and described lower throat bushing, the lower port of described lower throat bushing forms the liquid outlet of flow nipple；
The upper throat bushing of described first segment stem bar can come downwards under described of the fracturing fluid driving the lower port of the lower throat bushing making described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the control rod of described first segment stem bar depart from the lower port of the upper throat bushing of described first segment stem bar and the lower throat bushing of described first segment stem bar to be blocked the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine by the control rod of described first segment stem bar under of the fracturing fluid driving and the sand blast sliding sleeve of described one-level packer opened, exposed the sand jet outlet of described one-level packer so that flowing into described two layers of fracturing fluid outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
11. according to the arbitrary described pilot multiple fracturing device step by step of claim 5-9, it is characterised in that
In same described packer, the internal diameter of sand blast sliding sleeve is less than the internal diameter of flow nipple seat；
In two adjacent described packers, the internal diameter of the sand blast sliding sleeve of the described packer that the internal diameter of the sand blast sliding sleeve of the described packer that position height is relatively low is higher more than or less than position height, the internal diameter setting sliding sleeve of different described packers is identical；
The external diameter of the throat bushing of each described flow nipple is more than the external diameter of the control rod of this flow nipple, and the external diameter of throat bushing of each described flow nipple and the external diameter of control rod are all higher than the internal diameter of described sand blast sliding sleeve of the described packer at flow nipple seat place coordinated with this flow nipple.
12. according to the arbitrary described pilot multiple fracturing device step by step of claim 3-9, it is characterised in that the top of described tubing string is additionally provided with hydraulic anchor, the anchor fluke of described hydraulic anchor can in described tubing string the inwall of sleeve pipe described in clamping under of the fracturing fluid driving；
Be additionally provided with hydraulic tubing anchor outside the sanding machine of described end, described hydraulic tubing anchor can under the driving of hydraulic oil tubing string described in grappling.
13. the separate stratum fracfturing method of pilot step by step of pilot multiple fracturing device application step by step described in a claim 3-12 is arbitrary, it is characterised in that comprise the following steps:
S1, to ground floor implement pressure break:
After passing into fracturing fluid in tubing string, the fracturing fluid flowed out by the restriction of end sanding machine flows out from one layer of fracturing fluid outlet, and is expanded and abut by the elasticity part setting the fracturing fluid described one-level packer of driving that pilot port enters of one-level packer, being set on the inwall of sleeve pipe；
S2, to the second layer implement pressure break:
After putting into first segment stem bar in described tubing string and passing into fracturing fluid, described first segment stem bar drives the sliding sleeve that sets of two grades of packers to move to expose the pilot port that sets of described two grades of packers and make to be driven the elasticity part of described two grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described two grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described first segment stem bar also come downwards under described of the fracturing fluid driving the throat bushing that makes described first segment stem bar on the flow nipple seat on described one-level packer close to or towards the sand jet outlet of described one-level packer and make the control rod of described first segment stem bar depart from the throat bushing of described first segment stem bar to be blocked the fracturing fluid passage between the restriction of described one-level packer and described end sanding machine by the control rod of described first segment stem bar under of the fracturing fluid driving and opened by the sand blast sliding sleeve of described one-level packer, expose the sand jet outlet of described one-level packer so that flowing into two layers of fracturing fluids outlet through the fracturing fluid of the throat bushing of described first segment stem bar from the sand jet outlet of described one-level packer.
14. the separate stratum fracfturing method of pilot step by step according to claim 13, it is characterised in that the described separate stratum fracfturing method of pilot step by step is further comprising the steps of:
S3, to third layer implement pressure break:
After putting into second section stem bar in described tubing string and passing into fracturing fluid, described second section stem bar drives the sliding sleeve that sets of three grades of packers to move to expose the pilot port that sets of described three grades of packers and make to be driven the elasticity part of described three grades of packers expand and abut by the fracturing fluid that pilot port enters that sets of described three grades of packers under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described second section stem bar also come downwards under described of the fracturing fluid driving the throat bushing that makes described second section stem bar on the flow nipple seat on described two grades of packers close to or towards the sand jet outlet of described two grades of packers and make the control rod of described second section stem bar depart from the throat bushing of described second section stem bar to be blocked the fracturing fluid passage between described two grades of packers and the throat bushing of described first segment stem bar under of the fracturing fluid driving by the control rod of described second section stem bar and opened by the sand blast sliding sleeve of described two grades of packers, expose the sand jet outlet of described two grades of packers so that flowing into the outlet of described three layers fracturing fluid through the fracturing fluid of the throat bushing of described second section stem bar from the sand jet outlet of described two grades of packers.
15. the separate stratum fracfturing method of pilot step by step according to claim 14, it is characterised in that the described separate stratum fracfturing method of pilot step by step is further comprising the steps of:
S4, to the 4th layer implement pressure break:
After putting into the 3rd flow nipple in described tubing string and passing into fracturing fluid, described 3rd flow nipple drives the sliding sleeve that sets of level Four packer to move to expose the pilot port that sets of described level Four packer and make to be driven the elasticity part of described level Four packer expand and abut by the fracturing fluid that pilot port enters that sets of described level Four packer under described of the fracturing fluid driving, set on the inwall of described sleeve pipe, then described 3rd flow nipple also come downwards under described of the fracturing fluid driving the throat bushing that makes described 3rd flow nipple on the flow nipple seat on described three grades of packers close to or towards the sand jet outlet of described three grades of packers and make the control rod of described 3rd flow nipple depart from the throat bushing of described 3rd flow nipple to be blocked the fracturing fluid passage between described three grades of packers and the throat bushing of described second section stem bar under of the fracturing fluid driving by the control rod of described 3rd flow nipple and opened by the sand blast sliding sleeve of described three grades of packers, expose the sand jet outlet of described three grades of packers so that flowing into four layers of fracturing fluids outlet through the fracturing fluid of the throat bushing of described 3rd flow nipple from the sand jet outlet of described three grades of packers.
CN201410725335.XA 2014-12-03 2014-12-03 Step-by-step pressure-guide packer, step-by-step pressure-guide layering fracturing device and fracturing method Pending CN105715225A (en)

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