CN105863576A - Sand-preventing pipe column capable of achieving subsection exploiting - Google Patents
Sand-preventing pipe column capable of achieving subsection exploiting Download PDFInfo
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- CN105863576A CN105863576A CN201610309004.7A CN201610309004A CN105863576A CN 105863576 A CN105863576 A CN 105863576A CN 201610309004 A CN201610309004 A CN 201610309004A CN 105863576 A CN105863576 A CN 105863576A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/082—Screens comprising porous materials, e.g. prepacked screens
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/088—Wire screens
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The invention discloses a sand-preventing pipe column capable of achieving subsection exploiting. The sand-preventing pipe column comprises a production sleeve. Two primary sieve pipes are connected to the horizontal section of the production sleeve. An oil drawing pipe is fixed into the vertical section of the production sleeve through a packer. The horizontal end of the oil drawing pipe freely extends in the horizontal well section formed by the two primary sieve pipes and the sleeve. The horizontal section of the oil drawing pipe is provided with a secondary sieve pipe. A sieve hole of the secondary sieve pipe comprises a shrinkage section, a straight section and an impact section. The inner diameter of the shrinkage section is reduced gradually outwards in the radial direction of the secondary sieve pipe. The inner diameter of the impact section is reduced gradually outwards in the radial direction of the secondary sieve pipe. In the horizontal well, two pipe outer packers enable a naked eye to be divided into three parts, and oil liquid in the horizontal well enters the periphery of the oil drawing pipe through the two primary sieve pipes. At the moment, the oil liquid entering from the interiors of the two primary sieve pipes is conveyed into the upper portion of the vertical section of the production sleeve through the tail end of the oil drawing pipe and the secondary sieve pipe on the horizontal section of the oil drawing pipe, and then subsection exploiting of the horizontal well is achieved.
Description
Technical field
The invention belongs to horizontal well production technical field, particularly relate to a kind of sand control pipe realizing segmentation exploitation.
Background technology
Viscous crude is the important component part in the petroleum hydrocarbon energy, and its feature is as follows:
(1) colloid in viscous crude is high with bitumen content, and light ends is little.And along with resin and asphalt
Content increases the relative density of viscous crude and viscosity increases the most accordingly.
(2) thick oil viscosity is for very temperature sensitive, and along with the increase of temperature, viscosity drastically declines.And
Viscosity of crude is the biggest, and this change is the most obvious.
(3) in viscous crude, the hetero atom such as sulfur, oxygen, nitrogen is more.
(4) in viscous crude, paraffin content is the most relatively low, but also having only a few oil field is " double high oil field ", and i.e. asphalt content is high, paraffin content is the highest, is characterized as high viscosity high condensation point crude oil.
(5) same heavy crude reservoir, oil property usually has the biggest difference between each well in the different well sections and plane of vertical oil reservoir.
The most perfect along with Horizontal Well Drilling completion and production technique, horizontal well is conducive to improving well yield, increasing recoverable reserves and improve oil recovery rate, and current horizontal well development technology is applied to various types of oil reservoir.For the sandstone or Carbonate Reservoir of homogenizing, traditional barefoot completion, primary sieve tube completion, perforation completion mode can serve problem to horizontal well development band.Owing to level of production section is longer, being affected by pit shaft friction drag, the producing pressure differential of whole horizontal segment is different, heel end producing pressure differential is maximum, and toe-end producing pressure differential is minimum, ultimately results in horizontal segment production fluid uneven, the situation of toe-end not production fluid even occurs, significantly impacts the development effectiveness of horizontal well.
Summary of the invention
The invention reside in and a kind of sand control pipe realizing segmentation exploitation is provided, reduce the producing pressure differential of heel end, amplify the producing pressure differential of toe-end, it is achieved horizontal segment relatively evenly output, thus realize horizontal well in segments exploitation.
The present invention is achieved through the following technical solutions:
A kind of sand control pipe realizing segmentation exploitation, production casing including L-shaped, the horizontal segment of described production casing connects two primary screen casings, sleeve pipe is arranged between two primary screen casings, it is fixed with the oil pick-up tube of L-shaped by packer in the vertical section of described production casing, packer in pipe is installed in sleeve pipe, the net horizontal section that the horizontal ends of described oil pick-up tube is constituted at two described primary screen casings and sleeve pipe freely extends, two grades of screen casings it are provided with on the horizontal segment of oil pick-up tube, the primary screen casing that end is just being connected by described two grades of screen casings with production casing horizontal segment, two external packer of pipe are installed outside sleeve pipe, and bore hole is separated into three parts by two described external packer of pipe；The sieve aperture of described two grades of screen casings includes along two grades of sections of reducing that screen casing is radially outward sequentially connected with, flat segments and impact section, the described section of reducing internal diameter radially outward successively decreases along two grades of screen casings, described impact section internal diameter radially outward successively decreases along two grades of screen casings, described primary screen casing includes the base tube having multiple fuel feed hole on outer wall, on its outer circle wall, multiple ribs axially it is provided with along described base tube, and it is wound with wrapping wire along base tube circle to interval on multiple described ribs, the foamed iron block in triangle it is filled with between two adjacent ribs, described wrapping wire is made up of metal support and the projection of overall coiling molding, the cross section of described metal support is trapezoidal, the going to the bottom as minor face and be connected with ribs of described metal support, the upper end of described metal support, is long limit and is connected with projection, the cross section of described projection is circular arc.
In prior art, in the thermal process of viscous crude, the horizontal segment of horizontal well is the longest, and the friction drag of horizontal well toe-end is the biggest, and the production fluid ultimately resulting in horizontal segment is uneven, the i.e. heel end of horizontal segment differs with toe-end producing pressure differential, having a strong impact on the oil recovery efficiency of horizontal well, for this problem, the present invention is in horizontal well, make bore hole be divided into three parts, i.e. fluid in horizontal well by two external packer of pipe to be entered around oil pick-up tube by two primary screen casings respectively；Now, the fluid entered in two primary screen casings it is transported in production casing vertical section top respectively through two grades of screen casings on oil pick-up tube end and oil pick-up tube horizontal segment, and then completes the segmentation exploitation of horizontal well.The present invention utilizes segmentation to exploit, the frictional resistance being positioned at horizontal well toe-end production fluid is reduced, it is exaggerated the producing pressure differential of toe-end, increase the frictional resistance of horizontal well heel end production fluid simultaneously, reduce the producing pressure differential of heel end, it is achieved that horizontal segment production fluid relatively evenly output, efficiently solve the problem that the horizontal segment production fluid that conventional levels well completion mode caused is uneven, toe-end not production fluid even occur, realize horizontal segment equilibrium production fluid, the development effectiveness of well of improving the standard.And the fluid in the bore hole of production casing end is by primary screen casing and the filtration of two grades of screen casings, make to enter eventually into the solid concentration of fluid in oil pick-up tube and be down to minimum, and when the later stage of recovering the oil carries out clean-out service to horizontal completion, flushing fluid is injected in production casing, by flushing fluid, oil pick-up tube, primary screen casing and two grades of screen casings are carried out, it is ensured that horizontal completion oil recovery efficiency in later stage recovery process；
nullWherein，Flushing fluid is when being entered in oil pick-up tube by production casing，Owing to formation pressure is bigger，The resistance that flushing fluid in oil pick-up tube outwards sprays is the biggest，For two primary screen casings，Flushing fluid is in the primary screen casing being injected into close production casing side by the secondary screen casing on oil pick-up tube horizontal segment，Now rely on flushing fluid to secondary screen casing just to primary screen casing outside spray and be difficulty with the effect realizing the sieve aperture on the primary screen casing of dredging，Therefore，The sieve aperture of two grades of screen casings is improved by inventor，The i.e. sieve aperture of two grades of screen casings includes the section of reducing being sequentially connected with、Flat segments and impact section，And the internal diameter of the section of reducing and impact section all radially outward successively decreasing along two grades of screen casings，The internal diameter of flat segments then keeps constant，When overflowing in flushing fluid is by oil pick-up tube，Flushing fluid is after suddenly the diminishing of flow cross，Its flow velocity can be continuously increased，By the gentle transition in flat segments，It is accelerated in impact section again，Meanwhile，In horizontal well oil reservoir to the pressure in two grades of screen casings relatively with common sieve aperture for low，I.e. finally primary screen casing is washed away keeping its fast state by the flushing fluid overflowed in impact section，The solid phase particles being simultaneously blocked on two grades of screen casings and primary screen casing is then washed away by the flushing fluid with powerful impact dynamics，Two grades of screen casings and primary screen casing is made to keep the unobstructed of its sieve aperture.
During work, base tube is placed in the horizontal segment of horizontal completion, and viscous crude is entered in the gap of wrapping wire and sleeve pipe formation by wire spacing, after the filtration of foamed iron, enters into substrate tube through fuel feed hole, to realize the pumping of fluid；In prior art, steam flooding technology is used when viscous crude is exploited, i.e. it is provided above steam injection well and producing well at oil reservoir, steam is constantly passed through in steam injection well, steam is made constantly to heat the stratum around pit shaft, crude oil in stratum is also heated simultaneously, the steam zone progressively extended with constantly injecting of steam is formed in the stratum of near wellbore, steam can will drop to relatively low degree containing saturation in steam zone, and flowable crude oil (i.e. the difference of initial oil saturation and residual oil saturation) is displaced steam zone；Meanwhile, in the horizontal segment of horizontal completion, steam moves to updip direction consumingly, and under the force of gravity, the crude oil that is heated is driven onto and has a down dip reversely, and the increase of the temperature along with crude oil, the mixture such as profit in horizontal completion horizontal segment and gravel will boiling, crude oil is caused to be degraded (disturbance because of caused by the boiling of mixture), the mixture of profit and solid phase starts to be entered into substrate tube by horizontal completion horizontal segment, wrapping wire is a complete metal bar and is wound on multiple ribs by interval, form the primary filter unit to major diameter solid phases such as gravels in profit, and foam iron rule forms the secondary filter unit to minor diameter solid phase, to realize the sand control purpose of base tube；And, when being affected by the self-contained heat of fluid pressure and profit in horizontal completion horizontal segment and cause producing pressure change, the secondary filter interval formed between two adjacent ribs is compressed, but in this secondary filter interval, it is filled with multiple foamed iron block in triangle, foamed iron is after stress deforms upon, the runner that still can form multiple irregular geometric figures in secondary filter interval passes through for oil water mixture, and foamed iron inner duct stress generation minor variations and be not easy to be blocked, foamed iron has certain elasticity simultaneously, when elasticity recovery deformation, the duct in foamed iron resets, with the percolation ability in maintenance secondary filter interval, ensure the smooth exploitation of viscous crude.
Further, wrapping wire is made up of with projection metal support, and the cross section of metal support is trapezoidal, the cross section of projection is circular arc, and metallic supports is as the support member of wrapping wire, its minor face is connected with ribs, long limit is connected with projection, a trapezoidal runner is formed between two the most adjacent metallic supports cross sections, when the mixture of profit and solid phase enters runner, the solid phase particles being relatively large in diameter can actively be stopped by this runner, permission oil water mixture passes through, and when fluid moves, on projection outer wall, the solid phase of major diameter can be flicked by smooth curved surface, and reduce the contact area of solid phase and projection, make in oil recovery process, the filtration runner formed on wrapping wire directly will not contact with solid phase, reduce metallic supports damaged risk, extend wrapping wire service life in horizontal completion.
It is incremented by successively in two grades of screen casings length radially in the described section of reducing, flat segments and impact section.The section of reducing, flat segments and impact section are directly connected to flushing fluid jet velocity on two grades of screen casings in two grades of screen casings length radially, i.e. flushing fluid speed in sieve aperture is accelerated the most, the biggest to the impact dynamics of primary screen casing, and the section of reducing in the present invention, the length of flat segments and impact section is along the radially outward increasing of two grades of screen casings, the flushing fluid acceleration time in sieve aperture is extended, momentum when ensureing the injection of flushing fluid can be fully erased by the solid phase particles on primary screen casing and two grades of screen casings, ensure the stable output at horizontal completion later stage exploitation production fluid.
Also include giving up, described in give up and be connected with packer upper end by screw thread.Give up and can directly dock with the pumping pipe string in protective casing after being connected with packer, the vertical portion of first paragraph oil pipe is insulated into upper and lower two parts by packer simultaneously, and oilhole is opened in bottom, give up and be positioned at top, make by the production fluid flow in first paragraph primary screen casing after flowing into oilhole, directly with by the product liquid-phase mixing flowed in second segment oil pipe, concentrate on give up interior after be drawn out of outside well.
Also include that multiple reinforcement, multiple described reinforcements axially and are ringwise distributed on wrapping wire along described base tube.In the horizontal segment of horizontal completion, wrapping wire is not only by the pressure of oil reservoir, and the moment change with the change of reservoir temperature of this pressure, i.e. during the abrupt change of pressure, wrapping wire is highly prone to damage, and the present invention is by arranging multiple reinforcement being distributed ringwise on wrapping wire so that the first filter element that wrapping wire is formed stably is supported, with the production pressure being continually changing in horizontal segment in reply horizontal completion, extend the service life of himself simultaneously.
Described wrapping wire outer wall scribbles TiALN-WC/C layer.As preferably, at wrapping wire outer wall, TiALN-WC/C coating is set, and the coefficient of friction of TiALN-WC/C coating only has 0.1, when the solid phases such as sand grains constantly contact with wrapping wire, can greatly reduce frictional dissipation between the two, and with self lubricity, greatly ensure wrapping wire service life in horizontal completion.
Also including union joint, the two ends of described base tube are connected with blind pipe by union joint respectively.As preferably, the needs recovered the oil according to reality, base tube is connected with blind pipe by union joint, facilitate the pumping of crude oil, and the mode that abandoning tradition blind pipe directly welds with base tube when laying, directly change wrapping wire when wrapping wire damages to facilitate and base tube, wrapping wire need not be carried out integral replacing, reduce the production cost of thickened oil recovery.
The angle that the vertical line of the hypotenuse of described metal support and described base tube axis is formed is 15 ° ~ 20 °.As preferably, trapezoidal flow passage entry, the corner dimension between the vertical line of runner edges and base tube axis directly determines to enter the diameter of the solid phase in secondary filter unit；When this angle is less than 15 °, oil water mixture enters the resistance of secondary filter unit and increases so that the yield of horizontal completion reduces；When this angle is more than 20 °, the solid phase of common diameter enters to the amount of secondary filter unit and increases, and exacerbates the filtration load of foamed iron, after the through hole in blocking foamed iron, the oil mixing with water logistics capacity entered in base tube reduces equally, it is impossible to meet the volume of production requirement of oil well.
The present invention compared with prior art, has such advantages as and beneficial effect:
Present invention fluid in the bore hole of production casing end is by primary screen casing and the filtration of two grades of screen casings, make to enter eventually into the solid concentration of fluid in oil pick-up tube and be down to minimum, and when the later stage of recovering the oil carries out clean-out service to horizontal completion, flushing fluid is injected in production casing, by flushing fluid, oil pick-up tube, primary screen casing and two grades of screen casings are carried out, it is ensured that horizontal completion oil recovery efficiency in later stage recovery process.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is present configuration schematic diagram；
Fig. 2 is the structural representation of two grades of screen casing sieve apertures；
Fig. 3 is the structural representation of primary screen casing；
Fig. 4 is the longitdinal cross-section diagram of primary screen casing；
Fig. 5 is the sectional view of wrapping wire.
Labelling and corresponding parts title in accompanying drawing:
1-production casing, 2-sleeve pipe, 3-external packer of pipe, 4-primary screen casing, 5-give up, 6-packer, 7-oil pick-up tube, 8-pipe interior packer, 9-bore hole, 10-protective casing, bis-grades of screen casings of 11-, 111-impact section, 112-flat segments, the 113-section of reducing, A-heel end, B-toe-end, 12-reinforcement, 13-wrapping wire, 14-ribs, 15-base tube, 16-fuel feed hole, 17-union joint, 18-blind pipe, 19-foamed iron, 20-metal support, 21-projection.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1
As shown in Figures 1 to 5, the present embodiment includes the production casing 2 of L-shaped, the horizontal segment of described production casing 2 connects two primary screen casings, sleeve pipe 2 is arranged between two primary screen casings, it is fixed with the oil pick-up tube 7 of L-shaped by packer 6 in the described vertical section of production casing 2, packer 8 in pipe is installed in sleeve pipe 2, the net horizontal section that the horizontal ends of described oil pick-up tube 7 is constituted at two described primary screen casings and sleeve pipe 2 freely extends, two grades of screen casings 11 it are provided with on the horizontal segment of oil pick-up tube 7, the primary screen casing that end is just being connected by described two grades of screen casings 11 with production casing 2 horizontal segment, two external packer of pipe 3 are installed outside sleeve pipe 2, and bore hole 9 is separated into three parts by two described external packer of pipe 3；nullThe sieve aperture of described two grades of screen casings 11 includes the section of reducing 113 being radially outward sequentially connected with along two grades of screen casings 11、Flat segments 112 and impact section 111，The described section of reducing 113 internal diameter radially outward successively decreases along two grades of screen casings 11，Described impact section 111 internal diameter radially outward successively decreases along two grades of screen casings 11，Described primary screen casing 4 includes the base tube 15 having multiple fuel feed hole 16 on outer wall，Axially on its outer circle wall, multiple ribs 14 it is provided with along described base tube 15，And it is wound with wrapping wire 13 along base tube 15 circle to interval on multiple described ribs 14，The foamed iron 19 block in triangle it is filled with between two adjacent ribs 14，Described wrapping wire 2 is made up of metal support 20 and the projection 21 of overall coiling molding，The cross section of described metal support 20 is trapezoidal，The going to the bottom as minor face and be connected with ribs 3 of described metal support 20，The upper end of described metal support 20, is long limit and is connected with projection 21，The cross section of described projection 21 is circular arc.
In prior art, in the thermal process of viscous crude, the horizontal segment of horizontal well is the longest, and the friction drag of horizontal well toe-end B is the biggest, and the production fluid ultimately resulting in horizontal segment is uneven, the i.e. heel end A of horizontal segment differs with toe-end B producing pressure differential, having a strong impact on the oil recovery efficiency of horizontal well, for this problem, the present invention is in horizontal well, make bore hole 9 be divided into three parts, i.e. fluid in horizontal well by two external packer of pipe 3 to be entered around oil pick-up tube 7 by two primary screen casings respectively；Now, the fluid entered in two primary screen casings it is transported in 2 vertical sections of tops of production casing respectively through two grades of screen casings 11 on oil pick-up tube 7 end and oil pick-up tube 7 horizontal segment, and then completes the segmentation exploitation of horizontal well.The present invention utilizes segmentation to exploit, the frictional resistance being positioned at horizontal well toe-end B production fluid is reduced, it is exaggerated the producing pressure differential of toe-end B, increase the frictional resistance of horizontal well heel end A production fluid simultaneously, reduce the producing pressure differential of heel end A, it is achieved that horizontal segment production fluid relatively evenly output, efficiently solve the problem that the horizontal segment production fluid that conventional levels well completion mode caused is uneven, toe-end B not production fluid even occur, realize horizontal segment equilibrium production fluid, the development effectiveness of well of improving the standard.And the fluid in the bore hole 9 of production casing 2 end is by primary screen casing and the filtration of two grades of screen casings 11, make to enter eventually into the solid concentration of fluid in oil pick-up tube 7 and be down to minimum, and when the later stage of recovering the oil carries out clean-out service to horizontal completion, flushing fluid is injected in production casing 2, by flushing fluid, oil pick-up tube 7, primary screen casing and two grades of screen casings 11 are carried out, it is ensured that horizontal completion oil recovery efficiency in later stage recovery process；
nullWherein，Flushing fluid is when being entered in oil pick-up tube 7 by production casing 2，Owing to formation pressure is bigger，The resistance that flushing fluid in oil pick-up tube 7 outwards sprays is the biggest，For two primary screen casings，Flushing fluid is in the primary screen casing being injected into close production casing 2 side by the secondary screen casing on oil pick-up tube 7 horizontal segment，Now rely on flushing fluid to secondary screen casing just to primary screen casing outside spray and be difficulty with the effect realizing the sieve aperture on the primary screen casing of dredging，Therefore，The sieve aperture of two grades of screen casings 11 is improved by inventor，The i.e. sieve aperture of two grades of screen casings 11 includes the section of reducing 113 being sequentially connected with、Flat segments 112 and impact section 111，And the internal diameter of the section of reducing 113 and impact section 111 all radially outward successively decreasing along two grades of screen casings 11，The internal diameter of flat segments 112 then keeps constant，When overflowing in flushing fluid is by oil pick-up tube 7，Flushing fluid is after suddenly the diminishing of flow cross，Its flow velocity can be continuously increased，By the gentle transition in flat segments 112，It is accelerated in impact section 111 again，Meanwhile，In horizontal well oil reservoir to the pressure in two grades of screen casings 11 relatively with common sieve aperture for low，I.e. finally primary screen casing is washed away keeping its fast state by the flushing fluid overflowed in impact section 111，The solid phase particles being simultaneously blocked on two grades of screen casings 11 and primary screen casing is then washed away by the flushing fluid with powerful impact dynamics，Two grades of screen casings 11 and primary screen casing is made to keep the unobstructed of its sieve aperture.
During work, base tube 15 is placed in the horizontal segment of horizontal completion, and viscous crude enters in the gap of wrapping wire 13 and sleeve pipe formation by wrapping wire 13 gap, after the filtration through foamed iron 19, enters into base tube 15 through fuel feed hole 16 internal, to realize the pumping of fluid；In prior art, steam flooding technology is used when viscous crude is exploited, i.e. it is provided above steam injection well and producing well at oil reservoir, steam is constantly passed through in steam injection well, steam is made constantly to heat the stratum around pit shaft, crude oil in stratum is also heated simultaneously, the steam zone progressively extended with constantly injecting of steam is formed in the stratum of near wellbore, steam can will drop to relatively low degree containing saturation in steam zone, and flowable crude oil (i.e. the difference of initial oil saturation and residual oil saturation) is displaced steam zone；Meanwhile, in the horizontal segment of horizontal completion, steam moves to updip direction consumingly, and under the force of gravity, the crude oil that is heated is driven onto and has a down dip reversely, and the increase of the temperature along with crude oil, the mixture such as profit in horizontal completion horizontal segment and gravel will boiling, crude oil is caused to be degraded (disturbance because of caused by the boiling of mixture), the mixture of profit and solid phase starts by entering into base tube 15 in horizontal completion horizontal segment internal, wrapping wire 13 is a complete metal bar and is wound on multiple ribs 14 by interval, form the primary filter unit to major diameter solid phases such as gravels in profit, foamed iron 19 then forms the secondary filter unit to minor diameter solid phase, to realize the sand control purpose of base tube 15；And, when being affected by the self-contained heat of fluid pressure and profit in horizontal completion horizontal segment and cause producing pressure change, the secondary filter interval formed between two adjacent ribs 14 is compressed, but in this secondary filter interval, it is filled with multiple foamed iron 19 block in triangle, foamed iron 19 is after stress deforms upon, the runner that still can form multiple irregular geometric figures in secondary filter interval passes through for oil water mixture, and foamed iron 19 inner duct stress generation minor variations and be not easy to be blocked, foamed iron 19 has certain elasticity simultaneously, when elasticity recovery deformation, the duct in foamed iron 19 resets, with the percolation ability in maintenance secondary filter interval, ensure the smooth exploitation of viscous crude.
nullFurther，Wrapping wire 2 is made up of with projection 21 metal support 20，And the cross section of metal support 20 is trapezoidal，The cross section of projection 21 is circular arc，And metallic supports 20 is as the support member of wrapping wire 2，Its minor face is connected with ribs 3，Long limit is connected with projection 21，A trapezoidal runner is formed between two the most adjacent metallic supports 20 cross sections，When the mixture of profit and solid phase enters runner，The solid phase particles being relatively large in diameter can actively be stopped by this runner，Permission oil water mixture passes through，And when fluid moves，On projection 21 outer wall, the solid phase of major diameter can be flicked by smooth curved surface，And reduce the contact area of solid phase and projection 21，Make in oil recovery process，The filtration runner formed on wrapping wire 2 directly will not contact with solid phase，Reduce metallic supports 20 damaged risk，Extend the wrapping wire 2 service life in horizontal completion.
Wherein, the angle that the vertical line of the hypotenuse of described metal support 20 and described base tube 4 axis is formed is 15 ° ~ 20 °.Trapezoidal flow passage entry, the corner dimension between the vertical line of runner edges and base tube 4 axis directly determines to enter the diameter of the solid phase in secondary filter unit；When this angle is less than 15 °, oil water mixture enters the resistance of secondary filter unit and increases so that the yield of horizontal completion reduces；When this angle is more than 20 °, the solid phase of common diameter enters to the amount of secondary filter unit and increases, and exacerbates the filtration load of foamed iron 19, after the through hole in blocking foamed iron 19, the oil mixing with water logistics capacity entered in base tube 4 reduces equally, it is impossible to meet the volume of production requirement of oil well.
As preferably, it is incremented by successively in two grades of screen casings 11 length radially in the described section of reducing 113, flat segments 112 and impact section 111.The section of reducing 113, flat segments 112 and impact section 111 are directly connected to flushing fluid jet velocity on two grades of screen casings 11 in two grades of screen casings 11 length radially, i.e. flushing fluid speed in sieve aperture is accelerated the most, the biggest to the impact dynamics of primary screen casing, and the section of reducing 113 in the present invention, the length of flat segments 112 and impact section 111 is along the radially outward increasing of two grades of screen casings 11, the flushing fluid acceleration time in sieve aperture is extended, momentum when ensureing the injection of flushing fluid can be fully erased by the solid phase particles on primary screen casing and two grades of screen casings 11, ensure the stable output at horizontal completion later stage exploitation production fluid.
The present embodiment also includes giving up 5, described in give up and 5 be connected with packer 6 upper end by screw thread.Give up 5 be connected with packer 6 after can directly dock with oil pick-up tube 7 post in protective casing 10, the vertical portion of first paragraph oil pipe is insulated into upper and lower two parts by packer 6 simultaneously, and oilhole is opened in bottom, give up and 5 be positioned at top, make by the production fluid flow in first paragraph primary screen casing after flowing into oilhole, directly with by the product liquid-phase mixing flowed in second segment oil pipe, concentrating on gives up after in 5 is drawn out of outside well.
The present embodiment also includes that multiple reinforcement 12, multiple described reinforcements 12 axially and are ringwise distributed on wrapping wire 13 along described base tube 15.In the horizontal segment of horizontal completion, wrapping wire 13 is not only by the pressure of oil reservoir, and the moment change with the change of reservoir temperature of this pressure, i.e. during the abrupt change of pressure, wrapping wire 13 is highly prone to damage, and the present invention is by arranging multiple reinforcement 12 being distributed ringwise on wrapping wire 13 so that the first filter element that wrapping wire 13 is formed stably is supported, with the production pressure being continually changing in horizontal segment in reply horizontal completion, extend the service life of himself simultaneously.
As preferably, at wrapping wire 13 outer wall, TiALN-WC/C coating is set, and the coefficient of friction of TiALN-WC/C coating only has 0.1, when the solid phases such as sand grains constantly contact with wrapping wire 13, can greatly reduce frictional dissipation between the two, and with self lubricity, greatly ensure the wrapping wire 13 service life in horizontal completion.
As preferably, the needs recovered the oil according to reality, base tube 15 is connected with blind pipe 18 by union joint 17, facilitate the pumping of crude oil, and the mode that abandoning tradition blind pipe 18 directly welds with base tube 15 when laying, directly change wrapping wire 13 when wrapping wire 13 damages to facilitate and base tube 15, wrapping wire 13 need not be carried out integral replacing, reduce the production cost of thickened oil recovery.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (7)
- null1. the sand control pipe that can realize segmentation exploitation，Production casing (1) including L-shaped，It is characterized in that: the horizontal segment of described production casing (1) connects two primary screen casings (4)，Sleeve pipe (2) is arranged between two primary screen casings (4)，It is fixed with the oil pick-up tube (7) of L-shaped by packer (6) in described production casing (1) vertically section，Packer (8) in pipe is installed in sleeve pipe (2)，The net horizontal section that the horizontal ends of described oil pick-up tube (7) is constituted two described primary screen casings (4) and sleeve pipe (2) freely extends，Two grades of screen casings (11) it are provided with on the horizontal segment of oil pick-up tube (7)，The primary screen casing (4) that end is just being connected by described two grades of screen casings (11) with production casing (1) horizontal segment，Two external packer of pipe (3) are installed outside sleeve pipe (2)，And bore hole (9) is separated into three parts by two described external packer of pipe (3)；nullThe sieve aperture of described two grades of screen casings (11) includes the section of reducing (113) being radially outward sequentially connected with along two grades of screen casings (11)、Flat segments (112) and impact section (111)，The described section of reducing (113) internal diameter radially outward successively decreases along two grades of screen casings (11)，Described impact section (111) internal diameter radially outward successively decreases along two grades of screen casings (11)，Described primary screen casing (4) includes the base tube (15) having multiple fuel feed hole (16) on outer wall，Axially on its outer circle wall, multiple ribs (14) it is provided with along described base tube (15)，And it is wound with wrapping wire (13) along base tube (15) circle at the upper interval of multiple described ribs (14)，The foamed iron (19) block in triangle it is filled with between two adjacent ribs (14)，By the metal support (20) of overall coiling molding and projection, (21 form described wrapping wire (2)，The cross section of described metal support (20) is trapezoidal，The going to the bottom as minor face and be connected with ribs (3) of described metal support (20)，The upper end of described metal support (20), is long limit and is connected with projection (21)，The cross section of described projection (21) is circular arc.
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that the section of reducing described in: (113), flat segments (112) and impact section (111) are incremented by successively in two grades of screen casings (11) length radially.
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that: also include give up (5), described in give up (5) be connected with packer (6) upper end by screw thread.
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that: also include that multiple reinforcement (12), multiple described reinforcements (12) axially and are ringwise distributed on wrapping wire (13) along described base tube (15).
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that: on described wrapping wire (13) outer wall, scribble TiALN-WC/C layer.
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that: also including union joint (17), the two ends of described base tube (15) are connected with blind pipe (18) by union joint (17) respectively.
- A kind of sand control pipe realizing segmentation exploitation the most according to claim 1, it is characterised in that: the angle that the vertical line of the hypotenuse of described metal support (9) and described base tube (4) axis is formed is 15 ° ~ 20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610309004.7A CN105863576A (en) | 2016-05-11 | 2016-05-11 | Sand-preventing pipe column capable of achieving subsection exploiting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610309004.7A CN105863576A (en) | 2016-05-11 | 2016-05-11 | Sand-preventing pipe column capable of achieving subsection exploiting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105863576A true CN105863576A (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610309004.7A Pending CN105863576A (en) | 2016-05-11 | 2016-05-11 | Sand-preventing pipe column capable of achieving subsection exploiting |
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| Country | Link |
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| CN (1) | CN105863576A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106733587A (en) * | 2016-11-30 | 2017-05-31 | 贵州旭阳食品（集团）有限公司 | A kind of automatic splinter screening device for screening of fresh capsicum |
| WO2017193503A1 (en) * | 2016-05-11 | 2017-11-16 | 四川行之智汇知识产权运营有限公司 | Production string used for thickened oil thermal recovery in horizontal well |
| WO2017193504A1 (en) * | 2016-05-11 | 2017-11-16 | 四川行之智汇知识产权运营有限公司 | Thickened oil horizontal well completion string capable of achieving subsection extraction |
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Application publication date: 20160817 |
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