CN104453778A - Fracture sliding sleeve with dissoluble ball seat and fracturing method - Google Patents
Fracture sliding sleeve with dissoluble ball seat and fracturing method Download PDFInfo
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- CN104453778A CN104453778A CN201410638145.4A CN201410638145A CN104453778A CN 104453778 A CN104453778 A CN 104453778A CN 201410638145 A CN201410638145 A CN 201410638145A CN 104453778 A CN104453778 A CN 104453778A
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- ball seat
- inner core
- ring
- fracturing
- sliding bush
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000008398 formation water Substances 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 18
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000004090 dissolution Methods 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 229910001051 Magnalium Inorganic materials 0.000 abstract 2
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 235000020681 well water Nutrition 0.000 description 3
- 239000002349 well water Substances 0.000 description 3
- 241000370738 Chlorion Species 0.000 description 2
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910001414 potassium ion Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 therefore Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention provides a fracture sliding sleeve with a dissoluble ball seat and a fracturing method. The fracture sliding sleeve comprises an upper connector, an outer barrel connected to the lower end of the upper connector, an inner barrel sleeved with the inner side of the outer side in an axial moving mode and the ball seat sleeved with the inner side of the inner barrel, a liquid passing hole is formed in the side wall of the outer barrel in a penetrating mode, and the lower end of the outer barrel is connected with a lower connector. The inner barrel axially moves to open or close the liquid passing hole. An annular boss is arranged on the outer wall of the ball seat in the circumferential direction, and the ball seat is made of magnalium, and can be dissolved in mineral water. According to the fracturing method, a fracturing ball is thrown into a well and pressed, the annular boss of the ball seat is shorn off, a ceramic anticorrosion layer is damaged, the ball seat drives the inner barrel to move downwards, the sliding sleeve is opened, fracturing is executed, and the magnalium of the annular boss of the ball seat and formation water are in contact to generate a dissolution reaction. After the fracturing construction is completed for a period of time, the ball seat is dissolved completely, the inner diameter of the sliding sleeve is identical to that of a sleeve pipe, the full diameter of a completion pipe string is fractured, and downhole tools can be tripped into the well bottom without obstacles.
Description
Technical field
The present invention relates to a kind of downhole tool in oil recovery field, especially a kind of fracturing sliding bush and fracturing process with solubilized ball seat.
Background technology
Fracturing reform is the important means that effective exploitation employs low permeability oil and gas field, compactness oil gas field, shale gas, and wherein open hole packer pitching sliding sleeve multistage fracturing technique is the multistage fracture technology of the horizontal well applied widely.
Current open hole packer pitching sliding sleeve multistage fracturing technique, after fracturing reform completes, ball seat in pit shaft can bring following problem: pressure break segments is more, correspondingly enter more in completion tubular column under pitching sliding sleeve, along with constantly diminishing of ball seat internal diameter, the testing tool of production logging can be caused at all cannot to log well to each payzone down to shaft bottom, bottom construction size and tool sizes are restricted.In addition, if meet water-yielding stratum, conventional pitching sliding sleeve cannot close this layer especially, causes Oil/gas Well water logging, Oil/gas Well even can be caused time serious to stop production, and impact is normally exploited.
Summary of the invention
The object of this invention is to provide a kind of fracturing sliding bush and the fracturing process with solubilized ball seat, the problem entered under ball seat affects downhole tool after the pressure break existed to solve prior art completes.
For achieving the above object, the present invention proposes a kind of fracturing sliding bush with solubilized ball seat, described in there is solubilized ball seat fracturing sliding bush comprise: top connection; Urceolus, is connected to described top connection lower end, and the sidewall of described urceolus runs through liquid pass hole, and described urceolus lower end is connected with lower contact; Inner core, can axially movably be socketed in inside described urceolus, and opens or closes described liquid pass hole by moving axially; Ball seat, be socketed on inside described inner core, described ball seat comprises ring body and convexedly stretches in the ring-shaped lug of described ring body periphery wall, described ring-shaped lug is held on inside described inner core, described ball seat adopts the magnesium-aluminium alloy material that can dissolve under the corrosiveness of formation water to make, the external surface of described ball seat is provided with ceramic anticorrosive coat, by building the pressure above described ball seat, described ring body is separated with described ring-shaped lug, to destroy described ceramic anticorrosive coat.
Have the fracturing sliding bush of solubilized ball seat as above, wherein, described inner core lower end is connected with locknut, and described locknut is annular, and described ring-shaped lug is clamped between the lower end inside face of described inner core and the top end face of described locknut.
There is the fracturing sliding bush of solubilized ball seat as above, wherein, the lower end inner wall of described inner core is provided with concave station in first, the upper end inwall of described locknut is provided with concave station in second, in described first, concave station coordinates formation annular groove with concave station in described second, described ball seat is arranged in described annular groove, and has spacing between concave station in described ball seat and described second.
Have the fracturing sliding bush of solubilized ball seat as above, wherein, the upper end inwall of described inner core is provided with the ring-shaped groove for inner core described in push-and-pull, and described ring-shaped groove is 3, and arranges along the axially spaced-apart of described inner core.
There is the fracturing sliding bush of solubilized ball seat as above, wherein, the outer wall of described inner core is provided with the first groove and the second groove, described second groove is positioned at below described first groove, the spacing ring protruding from described outer tube inner wall is fixed with inside described urceolus, when described inner core moves vertically, described spacing ring can embed in described first groove or described second groove and lock described inner core.
Have the fracturing sliding bush of solubilized ball seat as above, wherein, the lower end inner wall of described urceolus is provided with shoulder, and described spacing ring is fixed between the top of described shoulder and described lower contact.
Have the fracturing sliding bush of solubilized ball seat as above, wherein, described inner core is connected to inside described urceolus by shear pin.
There is the fracturing sliding bush of solubilized ball seat as above, wherein, the lower end outer wall of described top connection coordinates with the upper end inwall of described urceolus and forms embedded groove, and a retainer ring is embedded in described embedded groove, and described inner core and described retainer ring link together by described shear pin.
The present invention also proposes a kind of fracturing process, and described fracturing process comprises:
S1: drop into pressure break ball in the fracturing sliding bush as above with solubilized ball seat, described pressure break ball is seated on ball seat and is sealed by the internal channel of described fracturing sliding bush;
S2: then build the pressure above described pressure break ball, ball seat ring-shaped lug is cut off, the ring body of ball seat is separated with ring-shaped lug, destroy ceramic anticorrosive coat, continue to build the pressure, shear pin is cut off, described pressure break spherical zone moves inner core and is axially moved downward to below liquid pass hole, described fracturing sliding bush is opened, and fracturing fluid enters stratum by described liquid pass hole and implements pressure break;
S3: after pressing crack construction, formation water enters in the inner core of described fracturing sliding bush by described liquid pass hole, and the described ball seat be made up of magnesium-aluminium alloy material destroys in described ceramic anticorrosive coat the corrosiveness being in described formation water and dissolves.
Fracturing process as above, wherein, the operating temperature range of described ball seat is 25 DEG C ~ 120 DEG C.
The present invention has the fracturing sliding bush of solubilized ball seat and the feature of fracturing process and advantage:
1, the fracturing sliding bush with solubilized ball seat of the present invention, its ball seat adopts magnesium-aluminium alloy material to make, after pressure break completes, sliding sleeve inside and combination of zones, formation water enters in sliding sleeve, owing to containing chlorion in formation water, potassium ion, sodium ion plasma panel, and salinity is higher, galvanic interaction is formed with magnadure, ball seat under the corrosiveness of formation water through dissolving voluntarily after a while, after ball seat dissolves, sliding sleeve internal diameter is identical with casing inner diameter, realize the full-bore of pressure break completion tubular column, downhole tool can at the bottom of accessible lower going-into-well, solve ball seat that prior art exists affect downhole tool under the defect that enters.
2, the fracturing sliding bush with solubilized ball seat of the present invention, its ball seat outer wall is provided with ring-shaped lug, and the external surface of ball seat is provided with ceramic anticorrosive coat, to prevent magnesium-aluminium alloy material to be corroded, by dropping into pressure break ball and suppressing, ring body is driven to be separated with ring-shaped lug, namely ring-shaped lug is cut off, the magnesium-aluminium alloy material at ring-shaped lug place is exposed to be corroded in formation water, until whole ball seat dissolves, realizes the full-bore of pressure break completion tubular column.
3, the fracturing sliding bush with solubilized ball seat of the present invention, also having can the function of switch, its inner core inwall arranges ring-shaped groove, can enter in sliding sleeve to block ring-shaped groove by under sliding sleeve switch instrument, by pull-up or under push away inner core moved up and down, close or open liquid pass hole, thus the closedown realized sliding sleeve or unlatching, especially when recording certain layer and being water yield formation, this water yield formation can be closed by closing sliding sleeve, avoid Oil/gas Well water logging, compared with the pitching sliding sleeve of routine, high without additional process, production operation efficiency.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the schematic diagram with the fracturing sliding bush of solubilized ball seat of the present invention;
Fig. 2 is the schematic diagram of ball seat in the present invention.
Critical element label declaration:
1 top connection
2 urceolus 21 retainer ring 22 liquid pass holes
23 shoulder 24 spacing rings
3 inner core 31 shear pin 32 ring-shaped grooves
Concave station in 33 first groove 34 second grooves 35 first
4 ball seat 41 ring body 42 ring-shaped lugs
5 locknuts
Concave station in 51 second
6 lower contact 61 steps
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
As shown in Figure 1 and Figure 2, the invention provides a kind of fracturing sliding bush with solubilized ball seat, comprise top connection 1, urceolus 2, inner core 3, ball seat 4 and lower contact 6.Wherein, urceolus 2 is connected to top connection 1 lower end, and the sidewall of urceolus 2 runs through liquid pass hole 22, and urceolus 2 lower end is connected with lower contact 6; Inner core 3 can axially movably be socketed in inside urceolus 2, and opens or closes liquid pass hole 22 by moving axially; Ball seat 4 is socketed on inside inner core 3, for being located pressure break ball, ball seat 4 comprises ring body 41 and convexedly stretches in the ring-shaped lug 42 of ring body 41 periphery wall, ring-shaped lug 42 is held on inside inner core 3, ball seat 4 adopts the magnesium-aluminium alloy material that can dissolve under the corrosiveness of formation water to make, this magnadure can dissolve voluntarily in containing the water of mineral matter, and the external surface of ball seat 4 is provided with ceramic anticorrosive coat, in order to protect magnesium-aluminium alloy material; Wherein ring-shaped lug 42 is the weak structure of ball seat, by dropping into pressure break ball and build the pressure above ball seat 4 (suppress to pressure reach certain value) makes ring body 41 be separated with ring-shaped lug 42, be separated with ring-shaped lug 42 by the pressure-driven ring body 41 controlled above ball seat 4 in other words, ring-shaped lug is cut off, to destroy the integrality of ceramic anticorrosive coat, make magnesium-aluminium alloy material exposed in formation water, dissolved by formation water.
Specifically, the threaded upper ends of urceolus 2 is connected to the lower end outside of top connection 1, the lower end of urceolus 2 is threaded in outside the upper end of lower contact 6, thus top connection 1, urceolus 2, lower contact 6 are combined into a body substantially in cylindrical tube shape, this body has can for liquid and the centre bore that passes through of pressure break ball.Be equipped with cover pipe thread at top connection 1 inwall and lower contact 6 outer wall, can be connected with sleeve pipe respectively.
In a specific embodiment, inner core 3 lower end is connected with locknut 5, and locknut 5 is annular, and ring-shaped lug 42 is clamped between the lower end inside face of inner core 3 and the top end face of locknut 5, and namely ball seat is locked by locknut.The ceramic anticorrosive coat of ball seat 4 external surface, be such as by being formed in the spraying of ball seat external surface, in order to prevent magnesium-aluminium alloy material to be corroded, after ceramic anticorrosive coat is damaged, magnadure just dissolves under the corrosiveness of formation water.
In a preferred embodiment, the lower end inside face of inner core 3 is provided with concave station 35 in first, the upper end inwall of locknut 5 is provided with concave station 51 in second, in first, concave station 35 coordinates formation annular groove with concave station in second 51, ball seat 4 is arranged in this annular groove, the ring body 41 of ball seat is arranged in this annular groove in other words, and has spacing between concave station 51 in the bottom face of ball seat 4 and second, moves down to cut off ring-shaped lug for ball seat when building the pressure.Specifically, locknut 5 and inner core 3 are together by a threaded connection, the lower end inner wall indent of inner core 3 forms concave station in first, and the upper end inwall indent of locknut 5 forms concave station in second, inner core 3 first in concave station 35 and second of locknut 5 concave station 51 dock and be combined together formation annular groove.
Wherein, sliding sleeve internal channel can be closed after pressure break ball is seated ball seat 4, by suppressing above pressure break ball and building the pressure, first the ring-shaped lug on ball seat cylindrical is sheared, destroy ceramic anticorrosive coat, ball seat move down described spacing distance and be resisted against locknut second on concave station, continue to build the pressure, pressure break spherical zone moves ball seat 4, inner core 3 moves down, opened fluid apertures 22, fracturing fluid enters stratum by liquid pass hole 22 and implements pressure break, after pressure break terminates, stratum and sliding sleeve intracavity inter-connection, after formation water enters inner core 3 inner chamber, ball seat 4 destroys in ceramic anticorrosive coat the corrosiveness being in formation water to start to dissolve, until whole ball seat dissolves completely, solve the problem that ball seat enters under consequent effects downhole tool, make downhole tool can at the bottom of accessible lower going-into-well, convenient to Oil/gas Well enforcement well logging, well workover, the measures such as control water.And existing pitching fracturing sliding bush, its ball seat generally adopts High-Hardness Cast Iron, the even employing high strength alloy steel had, and after pressing crack construction terminates, this ball seat neither solubilized, again milling difficulty, can hinder at the bottom of the lower going-into-wells such as testing tool.For the ball seat of retrievable, be not easily brought back ground.
As shown in Figure 1, inner core 3 can be connected discretely with urceolus 2, under original state, inner core 3 is connected with urceolus 2, and liquid pass hole 22 is closed by inner core 3, makes liquid pass hole 22 be in closed condition, depart from inner core 3 and urceolus 2 and to be connected and after moving down, the intracavity inter-connection of liquid pass hole 22 and urceolus 2, liquid pass hole 22 is in open mode, and the fracturing fluid that formation carries out fracturing work enters in stratum from this liquid pass hole 22.Be equipped with sealing ring above and below liquid pass hole 22, and sealing ring is located between urceolus 2 and inner core 3, to ensure sealing.In the present embodiment, the sidewall of urceolus 2 is along the circumferential direction evenly equipped with multiple liquid pass hole 22.
In one preferably technical scheme, inner core 3 is connected to inside urceolus 2 by shear pin 31, and after dropping into pressure break ball, by suppressing and building the pressure, shear pin 31 is cut off, under the driving of pressure, pressure break ball can drive ball seat, locknut, inner core to move down.
Preferably, the lower end outer wall of top connection 1 coordinates with the upper end inwall of urceolus 2 and forms embedded groove, and a retainer ring 21 is embedded in embedded groove, and inner core 3 and retainer ring 21 link together by shear pin 31.Namely, the lower end outer wall of top connection is provided with indent step, the upper end inwall of urceolus is provided with indent step, the indent step of top connection 1 is relative with the indent step of urceolus 2, and coordinate formation embedded groove, retainer ring 21 inlay card is fixed in embedded groove, and inner core 3 is fixed on inside retainer ring 21 by shear pin 31, to realize the connection with urceolus 2.Urceolus 2 is the stressed main body of sliding sleeve, because shear pin 31 is not connected directly between on urceolus 2, but is indirectly connected with urceolus 2 by being connected directly between on retainer ring 21, thus avoids the structural integrity destroying urceolus 2, improves its intensity.
Again as shown in Figure 1, the upper end inwall of inner core 3 is provided with the ring-shaped groove 32 for push-and-pull inner core 3, and ring-shaped groove 32 is 3, and arranges along the axially spaced-apart of inner core 3.Phase or when running into water-yielding stratum after manufacture, with entering switching tools (sliding sleeve, slide valve switch instrument) under oil pipe, coiled tubing, switching tools is located and is stuck in ring-shaped groove 32, by switching tools pull-up or under push away inner core 3, liquid pass hole 22 is opened or closed, the segmentation control water of Oil/gas Well can be realized in conjunction with open hole packer.Wherein, the ring-shaped groove being positioned at top and the ring-shaped groove being positioned at below are for blocking switching tools, be positioned at the effect that middle ring-shaped groove plays auxiliary positioning switching tools, simultaneously, also can retain the fracturing sand etc. extruded in the ring-shaped groove by top, avoid fracturing sand to enter in the ring-shaped groove of below.Therefore, fracturing sliding bush of the present invention has can switching function, especially when running into water yield formation, can close this water yield formation, avoiding Oil/gas Well water logging by closing sliding sleeve.
In a feasible technical scheme, the lower end inner wall of urceolus 2 is provided with shoulder 23, and spacing ring 24 is fixed between the top of shoulder 23 and lower contact 6.That is, spacing ring 24 is resisted against between the top end face of shoulder 23 and lower contact 6.
In the present embodiment, the outer wall of inner core 3 is provided with the first groove 33 and the second groove 34, second groove 34 is positioned at below the first groove 33, the spacing ring 24 protruding from urceolus 2 inwall is fixed with inside urceolus 2, when inner core 3 moves vertically, spacing ring 24 can embed in the first groove 33 of annular or the second groove 34 of annular and lock inner core 3, state sliding sleeve being in open or close.Such as, when inner core 3 is pushed away under switching tools, spacing ring 24 enters the first groove 33 by spacing for inner core 3 locked, sliding sleeve is made to be in opening, when inner core 3 is by switching tools pull-up, spacing ring 24 enters the second groove 34 by spacing for inner core 3 locked, makes sliding sleeve be in closed condition.
In addition, the inwall of lower contact 6 is provided with step 61, and step 61 can be spacing to inner core 3.That is, pressure break spherical zone moves inner core 3 when being moved downward to step 61 place, and liquid pass hole 22 and urceolus intracavity inter-connection, sliding sleeve is opened.
The present invention also provides a kind of fracturing process, and adopt the above-mentioned fracturing sliding bush with solubilized ball seat to carry out pressure break, this fracturing process comprises the following steps:
S1: drop into pressure break ball in the above-mentioned fracturing sliding bush with solubilized ball seat, pressure break ball is seated on ball seat 4 and is sealed by the internal channel of fracturing sliding bush;
S2: then suppress above pressure break ball and build the pressure (suppress to pressure reach certain value), ring-shaped lug on ball seat outer wall is cut off, ring body 41 in other words by controlling the pressure-driven ball seat above ball seat 4 is separated with ring-shaped lug 42, destroy ceramic anticorrosive coat, continue build the pressure (namely continuing to suppress), under the driving of pressure, shear pin 31 is cut off, pressure break spherical zone moves inner core 3 and is axially moved downward to below liquid pass hole 22, fracturing sliding bush is opened, and fracturing fluid enters stratum by liquid pass hole 22 and implements pressure break;
S3: after pressing crack construction, formation water enters in the inner core 3 of fracturing sliding bush by liquid pass hole 22, the ball seat 4 be made up of magnesium-aluminium alloy material destroys in ceramic anticorrosive coat the corrosiveness being in formation water and dissolves, after ball seat dissolves, sliding sleeve internal diameter is identical with casing inner diameter, thus the completion tubular column of same interior latus rectum passage (full-bore) can be obtained, facilitate the enforcement of oil well later stage operation, such as, be convenient to enter testing tool smoothly.
Fracturing sliding bush is after pressing crack construction, pit shaft is inner to be realized linking up with stratum, formation water enters in pit shaft, owing to there is chlorion, potassium ion, sodium ion plasma panel in formation water, and salinity is higher, magnesium-aluminium alloy material can form galvanic interaction in formation water, therefore, ball seat under the corrosiveness of formation water through dissolving voluntarily after a while.And in fracturing process, because ion concentration various in fracturing fluid is lower, magnesium-aluminium alloy material and its reaction very slow.Owing to being provided with ceramic anticorrosive coat as topping at ball seat external surface, the corrosion to ball seat in fracturing process can be reduced further.
Accordingly, after pressing crack construction, this topping need be destroyed, be exposed in formation water to make the magnesium-aluminium alloy material of ball seat.In the present embodiment, the outer wall of ball seat is provided with ring-shaped lug vertically, and ring-shaped lug is clamped between inner core and locknut, by dropping into pressure break ball and building the pressure, ring-shaped lug can be made to be cut off destruction, and inner magnesium-aluminium alloy material is just exposed in formation water and is corroded.
In the present embodiment, the operating temperature range of the ball seat be made up of magnesium-aluminium alloy material is 25 DEG C of (normal temperature) ~ 120 DEG C.The dissolution time of ball seat is relevant with the extraneous factor such as salinity, flow stream velocity of operating temperature, formation water, and operating temperature is higher, the salinity of formation water is higher, flow stream velocity is larger, and ball seat dissolution velocity is faster.
In addition, under enter testing tool after, if recording certain layer is water-yielding stratum, with entering the sliding sleeve position of switching tools to water-yielding stratum under oil pipe, coiled tubing, by switching tools locator card on the ring-shaped groove 32 of inner core inwall, drive inner core to move up and down by pulling and pushing switching tools, realize the switch of sliding sleeve, to facilitate the production test of oil well later stage and to realize control water.
Fracturing sliding bush of the present invention, during pressure break, drop into pressure break ball to down-hole and suppress, the ring-shaped lug of ball seat cylindrical is sheared, destroy the preservative treatment layer on ball seat surface, ball seat drives sliding sleeve inner core to move down simultaneously, open sliding sleeve, implement pressing crack construction, the magnesium-aluminium alloy material at ball seat ring-shaped lug place contacts with formation water and starts solubilizing reaction occurs, a period of time after pressing crack construction completes, ball seat dissolves completely, sliding sleeve internal diameter is identical with casing inner diameter, realizes the full-bore of pressure break completion tubular column, and downhole tool can at the bottom of accessible lower going-into-well.Fracturing sliding bush of the present invention can be used for the fracturing reform of low permeability oil and gas field, compactness oil gas field, shale gas exploitation, when for multistage fracturing reform, multiple sliding sleeve series connection is used.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.And it should be noted that, each ingredient of the present invention is not limited in above-mentioned overall applicability, the each technical characteristic described in manual of the present invention can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, the present invention covers other relevant with this case inventive point in the nature of things and combines and embody rule.
Claims (10)
1. there is a fracturing sliding bush for solubilized ball seat, it is characterized in that, described in there is solubilized ball seat fracturing sliding bush comprise:
Top connection;
Urceolus, is connected to described top connection lower end, and the sidewall of described urceolus runs through liquid pass hole, and described urceolus lower end is connected with lower contact;
Inner core, can axially movably be socketed in inside described urceolus, and opens or closes described liquid pass hole by moving axially;
Ball seat, be socketed on inside described inner core, described ball seat comprises ring body and convexedly stretches in the ring-shaped lug of described ring body periphery wall, described ring-shaped lug is held on inside described inner core, described ball seat adopts the magnesium-aluminium alloy material that can dissolve under the corrosiveness of formation water to make, the external surface of described ball seat is provided with ceramic anticorrosive coat, by building the pressure above described ball seat, described ring body is separated with described ring-shaped lug, to destroy described ceramic anticorrosive coat.
2. have the fracturing sliding bush of solubilized ball seat as claimed in claim 1, it is characterized in that, described inner core lower end is connected with locknut, and described locknut is annular, and described ring-shaped lug is clamped between the lower end inside face of described inner core and the top end face of described locknut.
3. there is the fracturing sliding bush of solubilized ball seat as claimed in claim 2, it is characterized in that, the lower end inside face of described inner core is provided with concave station in first, the upper end inwall of described locknut is provided with concave station in second, in described first, concave station coordinates formation annular groove with concave station in described second, described ball seat is arranged in described annular groove, and has spacing between concave station in described ball seat and described second.
4. have the fracturing sliding bush of solubilized ball seat as claimed in claim 1, it is characterized in that, the upper end inwall of described inner core is provided with the ring-shaped groove for inner core described in push-and-pull, and described ring-shaped groove is 3, and arranges along the axially spaced-apart of described inner core.
5. there is the fracturing sliding bush of solubilized ball seat as claimed in claim 1, it is characterized in that, the outer wall of described inner core is provided with the first groove and the second groove, described second groove is positioned at below described first groove, the spacing ring protruding from described outer tube inner wall is fixed with inside described urceolus, when described inner core moves vertically, described spacing ring can embed in described first groove or described second groove and lock described inner core.
6. have the fracturing sliding bush of solubilized ball seat as claimed in claim 5, it is characterized in that, the lower end inner wall of described urceolus is provided with shoulder, and described spacing ring is fixed between the top of described shoulder and described lower contact.
7. have the fracturing sliding bush of solubilized ball seat as claimed in claim 1, it is characterized in that, described inner core is connected to inside described urceolus by shear pin.
8. there is the fracturing sliding bush of solubilized ball seat as claimed in claim 7, it is characterized in that, the lower end outer wall of described top connection coordinates with the upper end inwall of described urceolus and forms embedded groove, a retainer ring is embedded in described embedded groove, and described inner core and described retainer ring link together by described shear pin.
9. a fracturing process, is characterized in that, described fracturing process comprises:
S1: drop into pressure break ball in the fracturing sliding bush with solubilized ball seat described in any one of claim 1 to 8, described pressure break ball is seated on ball seat and is sealed by the internal channel of described fracturing sliding bush;
S2: then build the pressure above described pressure break ball, the ring-shaped lug of ball seat is cut off, the ring body of ball seat is separated with ring-shaped lug, destroy ceramic anticorrosive coat, continue to build the pressure, shear pin is cut off, described pressure break spherical zone moves inner core and is axially moved downward to below liquid pass hole, described fracturing sliding bush is opened, and fracturing fluid enters stratum by described liquid pass hole and implements pressure break;
S3: after pressing crack construction, formation water enters in the inner core of described fracturing sliding bush by described liquid pass hole, and the described ball seat be made up of magnesium-aluminium alloy material destroys in described ceramic anticorrosive coat the corrosiveness being in described formation water and dissolves.
10. fracturing process as claimed in claim 9, it is characterized in that, the operating temperature range of described ball seat is 25 DEG C ~ 120 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638145.4A CN104453778A (en) | 2014-11-06 | 2014-11-06 | Fracture sliding sleeve with dissoluble ball seat and fracturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638145.4A CN104453778A (en) | 2014-11-06 | 2014-11-06 | Fracture sliding sleeve with dissoluble ball seat and fracturing method |
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| CN104453778A true CN104453778A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410638145.4A Pending CN104453778A (en) | 2014-11-06 | 2014-11-06 | Fracture sliding sleeve with dissoluble ball seat and fracturing method |
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| CN (1) | CN104453778A (en) |
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