CN103080470B - For with the many ball-ball seats of pumping pressure fracturing reduced - Google Patents
For with the many ball-ball seats of pumping pressure fracturing reduced Download PDFInfo
- Publication number
- CN103080470B CN103080470B CN201180041626.1A CN201180041626A CN103080470B CN 103080470 B CN103080470 B CN 103080470B CN 201180041626 A CN201180041626 A CN 201180041626A CN 103080470 B CN103080470 B CN 103080470B
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- ball
- ball seat
- hole
- isolating tool
- mandrel
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- 238000005086 pumping Methods 0.000 title description 2
- 238000002955 isolation Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000004888 barrier function Effects 0.000 claims abstract description 9
- 230000001965 increasing effect Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 33
- 238000007789 sealing Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
A kind of down-hole isolating tool, it comprises joint, is placed in the sleeve in described joint, and is couple to the ball seat mandrel of described sleeve, and described ball seat mandrel has at least two ball seats axially aligned with at least two through holes be placed in described ball seat mandrel.A kind of method of barrier wells, described method comprises and runs in well by downhole isolation system, wherein said downhole isolation system comprises the first down-hole isolating tool, described first down-hole isolating tool comprises the first joint, be placed in the first sleeve in described joint, with the first ball seat mandrel being couple to described first sleeve, described first ball seat mandrel has at least two ball seats with axially aligned first size of at least two through holes be placed in described first ball seat mandrel, at least two balls of the first size are dropped in described well, and described two balls of described first size are sat in described at least two ball seats of described first ball seat mandrel.
Description
Related application
Subject application requires the U.S. patent application case the 13/091st in application on April 21st, 2011, the priority of No. 988, and be its part continuation application, this case has the right to benefit from the U.S. Provisional Patent Application case the 61/327th of applying on April 23rd, 2010 then, No. 509, and advocate its priority, whole disclosures of described every case are incorporated herein by reference.Subject application also requires the U.S. Provisional Application case the 61/360th in application on July 1st, 2010 according to 35U.S.C. § 119 (e), and the priority of No. 796, it is incorporated herein by reference.
Technical field
Embodiment disclosed herein relates generally to down-hole isolating tool.More specifically, embodiment disclosed herein relates to the down-hole isolating tool with ball seat mandrel, and this ball seat mandrel has two or more ball seat.In addition, embodiment disclosed herein relates to the downhole isolation system with two or more down-holes isolating tool.In addition, embodiment disclosed herein relates to and downhole isolation system to be run in well and by the method for downhole isolation system isolation wellblock.
Background technology
In drilling well, completion or do over again in well, the given zone in barrier wells usually becomes and is necessary.In some applications, down-hole isolating tool drops in well a part for well to be isolated from another part.Downhole tool generally includes the sleeve being couple to ball seat.Ball can from surface fall and be seated at ball seat, with from well above instrument a part sealing or the part of barrier wells below instrument.Can more than one down-hole isolating tool be run in well, multiple districts of well are isolated.
Down-hole isolating tool can be combined with other downhole tool and run, such as, comprise packer, fracturing (or pressure break) plug, bridging plug etc.By drilling through instrument and fluid being recycled to surface to remove drilling well fragment to remove down-hole isolating tool and other downhole tool.
Down-hole isolating tool is set by wire, solenoid or conventional drill string.Instrument can run in open hole well, cased well or other down-hole completion system.The ball seat be placed in the isolating tool of down-hole is configured to hold ball to isolate the district of pit shaft, and allows to produce fluid from the district below the isolating tool of down-hole.When across seat from top apply pressure differential time, ball sits in seat.Such as, along with fluid from surface to pumped downhole to stratum with fracturing stratum time, ball sits in maintain fluid in ball seat, and provides the pressure break on stratum in district therefore above the isolating tool of down-hole.In other words, the ball of taking one's seat can anti-fluid flow in the district isolated below the isolating tool of down-hole.The pressure break on stratum allows to strengthen formation fluids in pit shaft.Ball can fall from surface, or can be placed in the isolating tool of down-hole, and runs in the instrument of down-hole.
At high temperature and high pressure, that is, higher than about 300 °F and higher than about 10,000psi time, the usual Available Material of down-hole ball may be unreliable.In addition, as shown in Figures 1 A and 1 B 1, conventional ball seat 36 comprises taper or funnel-shaped seat surface 40.Ball 38 contacts with seating face 40, and forms initial sealing.Based on the geometry of seating face 40 and ball 38, between the internal diameter and the external diameter of ball 38 of seating face 40, there is larger radial distance.Therefore, the loaded area between seating face 40 and ball 38 is less.Along with ball 38 is loaded into more high capacity in succession, ball 38 may stand the higher compression load exceeding the restriction of its material property, thus causes ball 38 fault.Even if ball 38 is out of shape, ball 38 cannot enough be out of shape to contact conical seat surface 40, and therefore the load-bearing surface 40 of the ball seat 36 of ball 38 keeps less.Increase in environment temperature also can increase the possibility extruded by seat 36 by ball 38 because material property reduces.The engineering properties of ball 38 material such as can reduce compressive stress restriction and elasticity, and this can be caused ball fractured or be increased by the possibility that ball seat 36 is extruded.Therefore, in high temperature and high pressure environment, isolating tool under conventional well, that is, the ball 38 in the isolating tool of down-hole and ball seat 36 may spill or fault.
Using this ball and ball falling apparatus for being used for fracturing process to isolate in the open hole well frac system of the component of not same district, each isolated area is used to the ball of different size.Specifically, in the pit shaft of isolating multiple district, use a series of ball to isolate each district.The ball of the first size seals the first seat in the firstth district, and the ball of the second size seals second seat in the second region.Nethermost district uses the minimum ball of serial ball, and uppermost district uses the biggest ball of serial ball.The diameter of size minimum ball normally 3/4 inch to 1 inch.Corresponding ball seat and corresponding through hole must have be less than ball diameter to hold and fulcrum ball.Typical hydraulic fracture fluids speed is between 20BPM (bucket is per minute) and 40BPM.Larger by the Pressure Drop of constraint (that is, little reach the ball seat of 3/4 inch and corresponding axially extending bore).This Pressure Drop adds total pump horse power place completed needed for isolation work.
Thus, for the district above and below effective sealing in high temperature and high pressure environment or batching pig and provide by system enough by stream down-hole isolating tool there is demand.
Summary of the invention
In one aspect, embodiment disclosed herein relates to down-hole isolating tool, it ball seat mandrel comprising joint, settle sleeve within a fitting and be couple to sleeve, ball seat mandrel has at least two ball seats axially aligned with at least two through holes be placed in ball seat mandrel.
On the other hand, embodiment disclosed herein relates to downhole isolation system, system comprises the first down-hole isolating tool, it comprises the first joint, be placed in the first sleeve in the first joint, with the first ball seat mandrel being couple to the first sleeve, first ball seat mandrel has at least two ball seats axially aligned with at least two through holes be placed in the first ball seat mandrel, with the second down-hole isolating tool, it comprises the second joint, be placed in the second sleeve in the second joint, with the second ball seat mandrel being couple to the second sleeve, second ball seat mandrel has at least two ball seats axially aligned with at least two through holes be placed in the second ball seat mandrel.
Again on the other hand, embodiment disclosed herein relates to a kind of method of barrier wells, the method comprises and runs in well by downhole isolation system, wherein downhole isolation system comprises the first down-hole isolating tool, first down-hole isolating tool comprises the first joint, settle the first sleeve within a fitting, with the first ball seat mandrel being couple to the first sleeve, first ball seat mandrel has at least two ball seats with axially aligned first size of at least two through holes be placed in the first ball seat mandrel, at least two balls of the first size are dropped in well, and at least two balls of the first size are sat at least two ball seats of the first ball seat mandrel.
Other aspects and advantages of the present invention will from following description and the claim and apparent of enclosing.
Accompanying drawing explanation
Figure 1A illustrates conventional ball seat and is placed in the cross-sectional view of the ball in ball seat.
Figure 1B is the conventional ball seat of Figure 1A and the detailed view of ball.
Fig. 2 A and Fig. 2 B illustrates the cross-sectional view of the down-hole isolating tool according to embodiment disclosed herein.
Fig. 3 A and Fig. 3 B illustrates phantom drawing according to the ball seat mandrel of down-hole disclosed herein isolating tool and cross-sectional view respectively.
Fig. 4 A and Fig. 4 B illustrates phantom drawing and the cross-sectional view of the ball seat mandrel of the down-hole isolating tool according to embodiment disclosed herein respectively.
Fig. 5 A illustrates the cross-sectional view of the ball seat according to embodiment disclosed herein.
Fig. 5 B illustrates the detailed view of Fig. 5 A.
Fig. 6 A illustrates the cross-sectional view of the ball seat according to embodiment disclosed herein.
Fig. 6 B illustrates the detailed view of Fig. 6 A.
Fig. 7 illustrates the cross-sectional view of the ball seat mandrel of the down-hole isolating tool according to embodiment disclosed herein.
Fig. 8 A and Fig. 8 B illustrates phantom drawing and the top view of the ball seat mandrel of the down-hole isolating tool according to embodiment disclosed herein respectively.
Detailed description of the invention
Embodiment disclosed herein relates generally to down-hole isolating tool.More specifically, embodiment disclosed herein relates to the down-hole isolating tool with ball seat mandrel, and ball seat mandrel has at least two or more ball seat.In addition, embodiment disclosed herein relates to the downhole isolation system with two or more down-holes isolating tool.In addition, embodiment disclosed herein relates to and downhole isolation system being run in well, and isolates wellblock by downhole isolation system.
Fig. 2 A and Fig. 2 B illustrates the down-hole isolating tool 200 according to embodiment disclosed herein.The joint 202 that instrument 200 comprises can be couple to drill string, produce post, solenoid or other downhole component.Joint 202 can be single tubular assembly, maybe can comprise two or more assembly.Such as, as in figs. 2 a and 2b, joint 202 can comprise shell 204 and lower casing 206.Upper shell 204 and lower casing 206 can threadably be coupled to each other, or are coupled by any alternate manner as known in the art, such as, weld, be press-fitted and couple with mechanical fastener.Such as, lower casing 206 can be couple to upper shell 204 by one or more hold-down screw 222.One or more ports mouth 221 is positioned in joint 202, is communicated with to allow the fluid between the hole of joint 202 with the annular space (not shown) formed between joint 202 with well (not shown).
Instrument 200 also comprises the sleeve 208 be placed in joint 202.Sleeve 208 to be configured to when applying predetermined pressure above instrument 200 axial slide downward in joint 202, as will be described in more detail below.The initial first end in the main chamber 210 closest to joint 202 of sleeve 208 or upper end are couple to joint 202.Sleeve 208 is couple to the inner surface of joint 202 by shear 212.In one embodiment, shear 212 can comprise one or more shear pin or shear screw, and it is configured to sleeve 208 to remain in initial position, until apply predetermined pressure above instrument 200.
Instrument 200 also comprises the ball seat mandrel 218 being couple to sleeve 208.In one embodiment, ball seat mandrel 218 can be placed in upper end 220 place closest to sleeve 208 in sleeve 208.But in other embodiments, ball seat mandrel 218 can be placed in center closest to sleeve 208 or lower end 214 place.Ball seat mandrel 218 is couple to sleeve by any mode as known in the art.Such as, in one embodiment, ball seat mandrel 218 can be threadedly engaged with sleeve 208.In another embodiment, ball seat mandrel 218 can be welded to ball seat mandrel 218.
With reference now to Fig. 3 A and Fig. 3 B, the phantom drawing according to the ball seat mandrel 218 of embodiment disclosed herein and cross-sectional view are shown respectively.As shown in the figure, in one embodiment, ball seat mandrel 218 can be included in two ball seats 224A, 224B being formed in 226 above of ball seat mandrel 218.One of each ball seat 224A, 224B and two through holes 228A, 228B extending through ball seat mandrel 218 axially aligns.The diameter of ball seat 224A, 224B and corresponding through hole 228A, 228B by sizing, to make to be maximized by the fluid flow area of ball seat mandrel 218.
Ball seat mandrel 218 226 wide to guarantee that the ball (not shown) fallen suitably sits in each seat 224A, 224B by fixed wheel above.In addition, the profile of 226 can be configured to the hydrodynamic force strengthening ball seat mandrel 218 above, that is, help directly to flow through through hole 228A, 228B, reduce fluid and flow through the frictional force of seat 224A, 224B and through hole 228A, 228B, and roughly reduce 226 and the wearing and tearing of ball seat mandrel 218 above.
Although Fig. 3 A and Fig. 3 B illustrates the ball seat mandrel 218 with two ball seats 224A, 224B and two corresponding through hole 228A, 228B, but affiliated skilled person should be appreciated that, on ball seat mandrel 218, three, four or multiple ball seat 224 can be formed in 226.Fig. 4 A and Fig. 4 B illustrates phantom drawing according to the ball seat mandrel 318 with four ball seats 324A, 324B, 324C, 324D of embodiment of the present invention and cross-sectional view respectively.As shown in the figure, one of each ball seat 324A, 324B, 324C, 324D and four through holes (only illustrating two in this figure) 328A, 328B of extending through ball seat mandrel 318 axially aligns.The diameter of ball seat 324A, 324B, 324C, 324D and corresponding through hole 328A, 328B by sizing, to make to be maximized by the fluid flow area of ball seat mandrel 318.
Ball seat mandrel 318 326 wide to guarantee that the ball (not shown) fallen suitably sits in each seat 324A, 324B, 324C, 324D by fixed wheel above.In addition, the profile of 326 can be configured to the hydrodynamic force strengthening ball seat mandrel 318 above, namely, help directly to flow through through hole 328A, 328B, reduce fluid and flow through the frictional force of seat 324A, 324B, 324C, 324D and through hole 328A, 328B, and roughly reduce 326 and the wearing and tearing of ball seat mandrel 318 above.Such as, as shown in Figure 4 A and 4 B, ball seat mandrel 318 above 326 the core 330 of 326 can be made above higher than each circumferential section 332 closest to four ball seats 324A, 324B, 324C, 324D by fixed wheel exterior feature.The rising of 326 above or the core 330 of projection prevent ball (not shown) against above 326 superficial residence or take one's seat, instead of to sit in one of ball seat 324A, 324B, 324C, 324D.Above between one or more ball seat, the part of 326 can be protruding to guarantee that ball suitably sits in ball seat 324A, 324B, 324C, 324D similarly.Along with fluid flows in well, wherein in fluid stream containing ball (not shown), except fluid pressure, above 326 profile help each ball (not shown) to sit in each ball seat 324A, 324B, 324C, 324D.
One or more ball seat 224A-B, 324A-D about the embodiment of Fig. 3 A, Fig. 3 B, Fig. 4 A and Fig. 4 B can comprise the seating face 4015 with ogival section, as shown in figs. 5 a and 5b, and as U. S. application case the 61/327th, disclosed in No. 509, the mode that this case full content is quoted in full is incorporated herein.As shown in the figure, the section of seating face 4015 is corresponding to drop in well and to sit in the section of the ball 4009 in ball seat 224,324.Specifically, the section of seating face 4015 is bending.Ogival section can be spherical or oval.Therefore, the radius of curvature of ogival section can be constant or variable.The radius of curvature of seating face 4015 can be approximately equal to the radius of curvature of ball 4009.Therefore, in one embodiment, seating face 4015 provides the seat of falling cheese had by the hole in it, and it is configured to hold ball 4009.
In one embodiment, seat 224A-B, 324A-D can comprise Part I 4017 and Part II 4019, as shown in Figure 5 A.Part I 4017 is axially placed in above Part II 4019.In this embodiment, Part I 4017 can comprise taper profile, makes to form conical surface.Part II 4019 can comprise the section of the section corresponding to ball 4009.When applying pressure differential above instrument, falling or move down in the isolating tool of down-hole along with it along with ball 4009, Part I 4017 can help ball 4009 is placed in the middle or be directed in seat, and contacts with Part II 4019.
As shown in figs. 6 a and 6b, the seating face 5015 with section can be comprised according to seat 224A-B, 324A-D of the down-hole isolating tool of embodiment disclosed herein.As shown in the figure, the section of seating face 5015 corresponds to the section of ball 5009 substantially.Specifically, the section of seating face 5015 comprises multiple separate section 5015a, 5015b, 5015c, 5015d, and it forms the serial section of the section corresponding to ball 5009 jointly.In some embodiments, the section of seating face 5015 can comprise 2,3,4,5 or more separate sections.Separate section can be straight line or arc.Such as, in one embodiment, each separate section has the radius of curvature being different from other separate section each.Or each separate section can have identical radius of curvature, but the radius of curvature of each separate section is less than the radius of curvature of ball 5009.In another example, each separate section can be straight line, and can comprise the angle being different from the angle of other separate section each of the central axis relative to axle 5007 or ball seat 224A-B, 324A-D.The section on average providing the section corresponding to ball 5009 substantially of the entire profile of seating face 5015.
In one embodiment, seat 224A-B, 324A-D can comprise Part I 5017 and Part II 5019, as shown in FIG.Part I 5017 is axially placed in above Part II 5019.In this embodiment, Part I 5017 can comprise taper profile, makes to form conical surface.Part II 5019 can comprise the section of the section corresponding to ball 5009 substantially.When applying pressure differential above instrument, falling or move down in the isolating tool of down-hole along with it along with ball 5009, Part I 5017 can help ball 5009 is placed in the middle or be directed in seat, and contacts with Part II 5019.
With reference to figure 5A to Fig. 5 B and Fig. 6 A to Fig. 6 B, the geometry (that is, section) of seat 224A-B, 324A-D enough contacts to realize sealing at ball 4009,5009 with providing between seat 224A-B, 324A-D.Due to pressure differential, the load increase on ball may make ball 4009,5009 slightly be out of shape to enter in ball seat 224A-B, 324A-D, thus strengthens sealing.Because the external diameter of ball 4009,5009 and the radial clearance between seat 224A-B, 324A-D less, so in some embodiments, ball 4009,5009 only needs to be out of shape less amount to provide and the contacting completely of the seating face 4015,5015 of ball seat 224A-B, 324A-D.
The section of seating face 4015,5015 as described above allows the larger contact surface between the ball 4009,5009 of taking one's seat and seating face 4015,5015.This contact surface provides extra bearer area to ball 4009,5009, thus prevents ball material owing to exceeding the maximum fault allowing the compressive stress of compressive stress of material.If pressure differential increases, so ball 4009,5009 may be out of shape, and (as described above) contact ball seat 224A-B, 324A-D, to be supported by seat 224A-B, 324A-D extra bearer.Due to the less radial clearance between ball 4009,5009 and seat section 4015,5015, the distortion of ball 4009,5009 can be minimum.
Referring back to Fig. 3 A and Fig. 3 B, ball seat mandrel 218 can also comprise and being configured to and the otch of assembly tool engagement, notch or other opening.Specifically, ball seat mandrel 218 above can form one or more otch 334 to allow assembly tool engagement ball seat mandrel 218 and assemble ball seat mandrel 218 (Fig. 2 A and Fig. 2 B) in sleeve 208 in 226.Such as, in one embodiment, assembly instrument (not shown) can engagement notch 334, and by the screw thread on the inner surface of the screw thread that rotates to engage on the external surface of ball seat mandrel 218 and sleeve 208.Affiliated skilled person should be appreciated that, can use various assembly instrument, and can use the various modes for ball seat mandrel 218 being couple to sleeve 208 as known in the art.
With reference now to Fig. 7, the cross-sectional view of the ball seat mandrel 518 according to embodiment disclosed herein is shown.As shown in the figure, ball seat mandrel 518 comprises at least two ball seats 524A, 524B above on 526 of being placed in fixed wheel exterior feature.In this embodiment, the lower end 515 of ball seat mandrel 518 comprises chamber 536.Chamber 536 is formed in the lower end 514 of ball seat mandrel 518, to provide the cylinder lower part of the ball seat mandrel 518 with outer diameter D 1 and internal diameter D2.Therefore, the ball seat mandrel 518 formed according to the embodiment shown in Fig. 6 can comprise two or more through hole (Fig. 6 illustrates in these through holes 528A), and it has the axial length being less than the through hole formed according to the embodiment shown in Fig. 3 and Fig. 4.Once complete frac treatment or other work, this chamber 536 can reduce will drilling well all materials amass.Therefore, the time removing down-hole isolating tool and spend can be reduced.
In some wells, may need to isolate multiple district in well.In this applications, multiple down-holes isolating tool can run in well with each part of barrier wells.Specifically, can by the system cloud gray model of multiple down-holes isolating tool in well to provide the pressure break of each isolated part, and allow to produce fluid from each district.In one embodiment, two or more down-holes isolating tool can be run in well.Because instrument series operation, that is, a down-hole isolating tool is placed in the axially downward of the second down-hole isolating tool, so the ball of a series of different size can be used to take one's seat or to be sealed in each instrument.Specifically, compared with the ball for taking one's seat against the down-hole isolating tool be axially positioned on above the first down-hole isolating tool, use less ball to take one's seat against the first down-hole isolating tool.Because the ball that will take one's seat is run in the fluid of down-hole, so use the ball of different size to make the ball for taking one's seat against the first down-hole isolating tool (that is, the instrument below) enough little of the down-hole isolating tool safely through being placed in above the first down-hole isolating tool.Similarly, once the fluid that resumes production from below, ball needs enough little of the down-hole isolating tool safely upwards through being positioned at above the instrument with the ball of taking one's seat, and removes along with production fluid to allow ball from system.
Thus, in one embodiment, downhole isolation system can comprise according to two or more down-holes of the present invention isolating tool.Specifically, the first down-hole isolating tool can be similar to the instrument about Fig. 2 A, Fig. 2 B, Fig. 4 A and Fig. 4 B as described above.First down-hole isolating tool, that is, lowermost down-hole isolating tool is configured to hold the minimum ball by a series of balls used with downhole isolation system, and makes it take one's seat.Therefore, in this example, first down-hole isolating tool can comprise ball seat mandrel 318, and it comprises four ball seats 324A, 324B, 324C, 324D and four corresponding through holes (only illustrating two in this figure) 328A, 328B, as shown in about Fig. 4 A and Fig. 4 B and described.Four ball seats can about the inner periphery of ball seat mandrel 318 interval equably, and when ball not yet sits in one or more ball seat 324A, 324B, 324C, 324D, can be made to be maximized by the fluid flow area of ball seat mandrel 318.
Second down-hole isolating tool can run above the first down-hole isolating tool.Second down-hole isolating tool is configured to allow the ball warp fallen to cross the first down-hole isolating tool during fluid or from the first down-hole isolating tool to surface producing from district below.Therefore, the second down-hole isolating tool is configured to hold the ball with the size (that is, diameter) be greater than for the ball of taking one's seat against the first down-hole isolating tool, and makes it take one's seat.Thus, in one embodiment, the second down-hole isolating tool as in figs. 2 a and 2b of the ball seat mandrel 218 had as shown in figures 3 a and 3b can be used.Specifically, the second down-hole isolating tool can comprise the ball seat mandrel 218 with through hole 228A, 228B corresponding to two axially aligned two ball seats 224A, 224B.Ball seat 224A, 224B can about the inner periphery of ball seat mandrel 318 interval equably, and when ball does not sit in one or more ball seat 224A, 224B, can allow the fluid flow area by ball seat mandrel 218 is maximized.Therefore, the size (that is, diameter) of each ball seat 224A, 224B of the second down-hole isolating tool is greater than the size (that is, diameter) of each ball seat 324A, 324B, 324C, 324D of the first downhole tool.
In other embodiments, extra down-hole isolating tool can run with the first and second down-hole isolating tools mentioned above, makes each down-hole isolating tool be positioned at below be configured to hold the ball less than the down-hole isolating tool being positioned at top and make it take one's seat.In an example, as shown in fig. 8 a and fig. 8b, the 3rd down-hole isolating tool with ball seat mandrel 718 can be positioned at above the first down-hole isolating tool and below the second down-hole isolating tool, ball seat mandrel 718 has three ball seats 724A, 724B, 724C and three axially aligned corresponding through hole (not shown).Therefore, each ball seat 724A, 724B, 724C of the 3rd down-hole isolating valve are greater than each ball seat 324A, 324B, 324C, 324D of the first down-hole isolating tool, but are less than each ball seat 224A, 224B of the second down-hole isolating tool.Although in this example, the quantity of ball seat reduces from nethermost instrument to uppermost instrument, but affiliated skilled person should be appreciated that, the ball seat quantity of each down-hole isolating tool can be identical, but the size of ball seat (that is, diameter) increases from nethermost downhole tool to uppermost downhole tool.In other embodiments, the down-hole isolating tool having at least two ball seats as described herein can run together with having the down-hole isolating tool of an only ball seat through hole corresponding to.In such systems, the down-hole isolating tool with a ball seat can comprise the ball seat mandrel had above fixed wheel exterior feature as described herein, and the large I of ball seat based on the down-hole isolating tool when running in well with a seat relative to there is the axial location of other down-hole isolating tool of two or more ball seat and sizing.
Present discussion runs the method for downhole isolation system as described herein and uses the method for downhole isolation system barrier wells as described herein.According to embodiment disclosed herein, the method for barrier wells comprises and runs in well by downhole isolation system, and downhole isolation system comprises the first down-hole isolating tool.First down-hole isolating tool comprises the first joint, arrangement the first sleeve within a fitting, with the first ball seat mandrel being couple to the first sleeve, the first ball seat mandrel comprises at least two ball seats with axially aligned first size of at least two through holes be placed in the first ball seat mandrel.Such as when needing the district under barrier wells above and below isolating tool, down-hole isolating tool can perform this fracturing, at least two balls of the first size are dropped in well.Ball can be placed in the fluid delivered to downwards by drill string pump in well.When ball arrives the first down-hole isolating tool, each ball moves in the ball seat of isolating tool.The profile in the face of ball seat mandrel and the pressure of fluid stream help ball to be positioned in ball seat.Realize the sealing across the internal diameter of down-hole isolating tool against the pressure (that is, fluid pressure) of the ball of taking one's seat above the first down-hole isolating tool, thus by the district below instrument above instrument separate from.Once realize this sealing, other process can be performed, such as, fracturing stratum or cased well, as discussed above.
Extra district can be isolated in the downhole isolation system with two or more down-holes isolating tool.In this embodiment, run above the first down-hole isolating tool of the second down-hole isolating tool in well.Second down-hole isolating tool comprises the second joint, settle the second sleeve within a fitting and be couple to the second ball seat mandrel of the second sleeve.Second ball seat mandrel comprises at least two ball seats with axially aligned second size of at least two through holes be placed in the second ball seat mandrel.Such as when needing the district above and below the isolating tool of isolation second down-hole, down-hole isolating tool can perform this fracturing, at least two balls of the second size are dropped in well.Ball can be placed in the fluid be pumped into downwards by drill string in well.When ball arrives the second down-hole isolating tool, each ball moves in the ball seat of the second down-hole isolating tool.The profile in the face of ball seat mandrel and the pressure of fluid stream help ball to be positioned in ball seat.Realize the sealing across the internal diameter of down-hole isolating tool against the pressure (that is, fluid pressure) of the ball of taking one's seat above the first down-hole isolating tool, thus by the district below instrument above instrument separate from.Once realize this sealing, other process can be performed, such as, fracturing stratum or cased well, as discussed above.
The ball of different size can be used to sit in the different down-holes isolating tool of downhole isolation system, and sealed.The ball of the first size falls to take one's seat against the first down-hole isolating tool.The ball of the first size is less than the ball of the second size, and the ball of the second size falls to take one's seat against the second down-hole isolating tool be axially positioned on above the first down-hole isolating tool.The ball of the first size is enough little of suitably safely by the ball seat of (that is, not have to block or sealing) the second down-hole isolating tool, but enough littlely takes one's seat with the ball seat against the first down-hole isolating tool, and realizes sealing.The ball of the second size is greater than the ball seat of the second down-hole isolating tool, to take one's seat against the second down-hole isolating tool and to be sealed.
Once complete extra process, just can start or recover the production in district below.Referring back to Fig. 2 A and Fig. 2 B, by remove the sealing that realized by the ball that sits in ball seat and or recover the production in district below.For realizing this, by the fluid pressure of increasing action on the ball seat mandrel 218 with the ball (not shown) sat in each ball seat (not shown) on 226 and the pressure differential applied across ball seat mandrel 218.Pressure above ball seat mandrel 218 is increased to higher than predetermined value, and it corresponds to the maximum rating of the shear 212 sleeve 208 being couple to joint 202.Once exceed predetermined value, shear scissors cutting apparatus 212, thus allow sleeve 208 axially to move down, until the lower end 214 of sleeve 208 contacts the inside shoulder 216 in joint 202.Because ball seat mandrel 218 is couple to sleeve 208, so ball seat mandrel 218 moves down along with sleeve 208 is axial.Sleeve 208 axially moves down the distance of the one or more ports mouth 221 enough opening joint 202.Once open port mouth 221, namely, sleeve 208 moves down, and no longer blocks port mouth 221, and the fluid stream above the isolating tool of down-hole can flow to the anchor ring (not shown) formed between the external diameter of joint 202 and well, sleeve pipe or other downhole tool.Produce fluid from the district below the isolating tool of down-hole and will mention the ball sat in ball seat, and ball is carried to surface.Because be positioned at the ball seat of the down-hole isolating tool of higher height and corresponding through hole to be compared to the ball that down-hole isolating tool below falls and to have larger diameter, as discussed above, so ball is upwards carried by other down-hole isolating tool by the fluid produced, and turn back to surface.
Embodiment described herein advantageously provides the down-hole isolating tool with larger equivalent through hole, by using multiple ball seat and multiple ball to realize the sealing across each down-hole isolating tool.Advantageously allow isolation, pressure break and the multiple different district of production according to downhole isolation system of the present invention, but reduce the amount of required pump horse power.Specifically, because maximized along with the multiple ball seat of use by the area of the fluid stream of each downhole isolation system, so compared with the 1000psi difference of conventional ball seat, the Pressure Drop across the ball seat of the down-hole isolating tool according to embodiment disclosed herein lowly can reach 600psi or lower.Therefore, need lower pump horse power to carry out isolating tool, and the sleeve of instrument is transformed into the Bu Kou that anchor ring is opened.Pump horse power needed for reduction advantageously can reduce the total cost of fracture job.
In addition, some embodiments can advantageously provide the ball seat mandrel with the chamber be placed in the lower end of axle.This chamber can provide the easier drilling well of ball seat mandrel, to remove ball seat mandrel from well.Therefore, embodiment disclosed herein can provide the shorter drilling time removing ball seat mandrel.
Although the embodiment about limited quantity describes the present invention, the one of ordinary skill in the art with the benefit of present disclosure should be appreciated that, can design other embodiment do not departed from as category of the present invention disclosed herein.Thus, category of the present invention claim of should only being enclosed limited.
Claims (19)
1. a down-hole isolating tool, it comprises:
Joint;
Be placed in the ball seat mandrel in described joint, described ball seat mandrel comprises:
At least two ball seats, each have the corresponding through hole be placed in described ball seat mandrel, and at least one of wherein said at least two ball seats comprises the seating face with ogival section, and its radius of curvature equals the radius of curvature of the section of lower falling sphere substantially; With
Convex surfaces, described at least two ball seats extend through described convex surfaces, described convex surfaces comprises the core of rising and lower circumference part, and described lower circumference part has the lower point extending the radial distance corresponding to the radial distance limited by described at least two ball seats from the summit of convex surfaces.
2. down-hole according to claim 1 isolating tool, it also comprises the sleeve being couple to described ball seat mandrel.
3. down-hole according to claim 1 isolating tool, wide by fixed wheel above wherein said ball seat mandrel, the core above described in making is higher than each circumferential section closest to described at least two ball seats.
4. down-hole according to claim 2 isolating tool, it also comprises the shear being configured to described sleeve is couple to described joint.
5. down-hole according to claim 1 isolating tool, wherein said joint also comprises at least one Bu Kou of the upper end be placed in closest to described joint.
6. down-hole according to claim 4 isolating tool, wherein said joint comprises the inside shoulder being configured to engage described sleeve after described shear is sheared.
7. a downhole isolation system, described system comprises:
First down-hole isolating tool, it comprises:
First joint;
Be placed in the first sleeve in described first joint; With
Be couple to the first ball seat mandrel of described first sleeve, described first ball seat mandrel comprises:
At least two ball seats axially aligned with at least two through holes be placed in described first ball seat mandrel, at least one of wherein said at least two ball seats comprises the seating face with ogival section, and its radius of curvature equals the radius of curvature of the section of lower falling sphere substantially; With
Convex surfaces, described at least two ball seats extend through described convex surfaces, described convex surfaces comprises the core of rising and lower circumference part, and described lower circumference part has the lower point extending the radial distance corresponding to the radial distance limited by described at least two ball seats from the summit of convex surfaces; With
Second down-hole isolating tool, it comprises:
Second joint;
Be placed in the second sleeve in described second joint; With
Be couple to the second ball seat mandrel of described second sleeve, described second ball seat mandrel comprises:
At least two ball seats axially aligned with at least two through holes be placed in described second ball seat mandrel.
8. system according to claim 7, wherein said first ball seat mandrel comprises at least three ball seats, and described second ball seat mandrel comprises at least two ball seats.
9. system according to claim 7, at least one of described at least two ball seats of wherein said second ball seat mandrel comprises the seating face with ogival section, and its radius of curvature equals the radius of curvature of the section of lower falling sphere substantially.
10. system according to claim 7, wherein said first ball seat mandrel each described in the diameter of at least two ball seats identical.
11. systems according to claim 7, each diameter of described at least two ball seats of wherein said first ball seat mandrel is different from each diameter of described at least two ball seats of described second ball seat mandrel.
12. systems according to claim 7, the ball seat quantity of wherein said first down-hole isolating tool equals the ball seat quantity of described second down-hole isolating tool.
13. systems according to claim 12, the diameter of each ball seat of wherein said first down-hole isolating tool is different from the diameter of each ball seat of described second down-hole isolating tool.
The method of 14. 1 kinds of barrier wells, described method comprises:
Downhole isolation system run in well, wherein said downhole isolation system comprises the first down-hole isolating tool, and described first down-hole isolating tool comprises:
First joint;
Be placed in the first sleeve in described first joint; With
Be couple to the first ball seat mandrel of described first sleeve, described first ball seat mandrel comprises:
With at least two ball seats of axially aligned first size of at least two through holes be placed in described first ball seat mandrel;
At least two balls of the first size are dropped in described well; With
At least two balls described in described first size are sat at least two ball seats described in described first ball seat mandrel,
Described in wherein each, at least two ball seats comprise the seating face with ogival section, and its radius of curvature equals the radius of curvature of the section of described ball substantially, and
Wherein said first ball seat mandrel comprises convex surfaces, described at least two ball seats extend through described convex surfaces, described convex surfaces comprises the core of rising and lower circumference part, and described lower circumference part has the lower point extending the radial distance corresponding to the radial distance limited by described at least two ball seats from the summit of convex surfaces.
15. methods according to claim 14, it also comprises the pressure differential increased across described ball and described ball seat.
16. methods according to claim 14, wherein said downhole isolation system also comprises the second down-hole isolating tool, and described second down-hole isolating tool comprises:
Second joint;
Be placed in the second sleeve in described second joint; With
Be couple to the second ball seat mandrel of described second sleeve, described second ball seat mandrel comprises:
With at least two ball seats of axially aligned second size of at least two through holes be placed in described second ball seat mandrel.
17. methods according to claim 16, it also comprises:
At least two balls of the second size are dropped in described well; And
Described at least two balls of described second size are sat at least two ball seats of described second ball seat mandrel.
18. methods according to claim 16, wherein said first down-hole isolating tool is axially positioned on below the described second down-hole isolating tool in described well, and first second size being less than the described ball seat of described second ball seat mandrel of the described ball seat of wherein said first ball seat mandrel.
19. methods according to claim 14, it also comprises:
Increase the pressure differential across described at least two ball seats;
Shear scissors cutting apparatus; And
In described joint under move axially described first sleeve.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36079610P | 2010-07-01 | 2010-07-01 | |
| US61/360,796 | 2010-07-01 | ||
| US13/091,988 US9045963B2 (en) | 2010-04-23 | 2011-04-21 | High pressure and high temperature ball seat |
| US13/091,988 | 2011-04-21 | ||
| PCT/US2011/042739 WO2012003419A2 (en) | 2010-07-01 | 2011-07-01 | Multiple ball-ball seat for hydraulic fracturing with reduced pumping pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103080470A CN103080470A (en) | 2013-05-01 |
| CN103080470B true CN103080470B (en) | 2015-11-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180041626.1A Expired - Fee Related CN103080470B (en) | 2010-07-01 | 2011-07-01 | For with the many ball-ball seats of pumping pressure fracturing reduced |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN103080470B (en) |
| CA (1) | CA2804151C (en) |
| RU (1) | RU2013104186A (en) |
| WO (1) | WO2012003419A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10753197B2 (en) | 2012-05-07 | 2020-08-25 | Packers Plus Energy Services Inc. | Method and system for monitoring well operations |
| US9624754B2 (en) | 2013-03-28 | 2017-04-18 | Halliburton Energy Services, Inc. | Radiused ID baffle |
| CN104329045A (en) * | 2014-09-01 | 2015-02-04 | 吉林市旭峰激光科技有限责任公司 | Ball throwing double-taper-angle sealing ball seat |
| CN104405338B (en) * | 2014-12-01 | 2017-02-22 | 中国石油天然气股份有限公司 | Sleeve fracturing ball seat |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998003766A1 (en) * | 1996-07-19 | 1998-01-29 | Rick Picher | Downhole two-way check valve |
| CA2412072A1 (en) * | 2001-11-19 | 2003-05-19 | Packers Plus Energy Services Inc. | Method and apparatus for wellbore fluid treatment |
| AU2006257625A1 (en) * | 2005-06-15 | 2006-12-21 | Schoeller-Bleckmann Oilfield Equipment Ag | Novel activating mechanism for controlling the operation of a downhole tool |
| CN2898283Y (en) * | 2006-04-26 | 2007-05-09 | 中国石油天然气股份有限公司 | Buffering sliding-casing switch |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314015A (en) * | 1992-07-31 | 1994-05-24 | Halliburton Company | Stage cementer and inflation packer apparatus |
| US7640991B2 (en) * | 2005-09-20 | 2010-01-05 | Schlumberger Technology Corporation | Downhole tool actuation apparatus and method |
| US7644772B2 (en) * | 2007-08-13 | 2010-01-12 | Baker Hughes Incorporated | Ball seat having segmented arcuate ball support member |
| US20090308614A1 (en) * | 2008-06-11 | 2009-12-17 | Sanchez James S | Coated extrudable ball seats |
| US7814981B2 (en) * | 2008-08-26 | 2010-10-19 | Baker Hughes Incorporated | Fracture valve and equalizer system and method |
-
2011
- 2011-07-01 WO PCT/US2011/042739 patent/WO2012003419A2/en active Application Filing
- 2011-07-01 CN CN201180041626.1A patent/CN103080470B/en not_active Expired - Fee Related
- 2011-07-01 RU RU2013104186/03A patent/RU2013104186A/en unknown
- 2011-07-01 CA CA2804151A patent/CA2804151C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998003766A1 (en) * | 1996-07-19 | 1998-01-29 | Rick Picher | Downhole two-way check valve |
| CA2412072A1 (en) * | 2001-11-19 | 2003-05-19 | Packers Plus Energy Services Inc. | Method and apparatus for wellbore fluid treatment |
| AU2006257625A1 (en) * | 2005-06-15 | 2006-12-21 | Schoeller-Bleckmann Oilfield Equipment Ag | Novel activating mechanism for controlling the operation of a downhole tool |
| CN2898283Y (en) * | 2006-04-26 | 2007-05-09 | 中国石油天然气股份有限公司 | Buffering sliding-casing switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2804151A1 (en) | 2012-01-05 |
| CN103080470A (en) | 2013-05-01 |
| WO2012003419A3 (en) | 2012-03-08 |
| RU2013104186A (en) | 2014-08-10 |
| CA2804151C (en) | 2015-01-06 |
| WO2012003419A2 (en) | 2012-01-05 |
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