CN105971567A

CN105971567A - Screen pipe used for shallow thickened oil horizontal completed well

Info

Publication number: CN105971567A
Application number: CN201610309042.2A
Authority: CN
Inventors: 贺昶明
Original assignee: Sichuan Xingzhi Zhihui Intellectual Property Operation Co Ltd
Current assignee: Sichuan Xingzhi Zhihui Intellectual Property Operation Co Ltd
Priority date: 2016-05-11
Filing date: 2016-05-11
Publication date: 2016-09-28

Abstract

The invention discloses a screen pipe used for a shallow thickened oil horizontal completed well. The screen pipe comprises a base pipe body of which the outer wall is provided with a plurality of oil inlet holes. A plurality of reinforcing ribs are arranged on the outer circumferential wall of the base pipe body in the axial direction of the base pipe body, and winding wires are wound on the multiple reinforcing ribs in the circle direction of the base pipe body at intervals. The position between every two adjacent reinforcing ribs is filled with foam iron in a triangular block shape. When the screen pipe works, the base pipe body is placed on the horizontal segment of the horizontal completed well, and thickened oil enters clearances formed by the winding wires and casing pipes through clearances of the winding wires and enters the base pipe body through the oil inlet holes under the filtering effect of the foam iron, so that oil liquid pumping is achieved.

Description

A kind of screen casing for shallow layer thick oil horizontal completion

Technical field

The present invention relates to field of petroleum exploitation, specifically refer to a kind of screen casing for shallow layer thick oil horizontal completion.

Background technology

Petroleum resources are present among the oil reservoir naturally occurred, and its production technique is different with Oil Reservoir Types, primary characteristic difference.Viscous crude, also referred to as heavy oil i.e. high viscosity heavy crude, refers to the heavy crude that viscosity is high, density is big, resin and asphalt content is higher, i.e. high viscosity heavy crude, and general paraffin content is less, thus viscosity of crude is higher, and flow resistance is relatively big, and exploitation difficulty is big.

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 heavy oil reserves of China is enriched, and viscous crude annual production accounts for the 10% of crude oil total output, and according to China's Second National resource assessment data, viscous crude stock number there are about 8198.710t.But under formation temperature conditions, thick oil viscosity is too high, it is difficult to flowing, is difficult to extraction with conventional oil production method.Because viscosity is relatively big, so its recovery method is different from the recovery method of ordinary crude oils, this is to be determined by the feature of viscous crude.Thick oil viscosity is too high, and the mobility ratio of water is too high, uses the oil extraction method of routine to carry out heavy crude producing effect very little.

At present, China each elephant improves the method mainly steam soak of thick oil recovery ratio and steam drives, but carry out steam soak and steam drive after its recovery percent of reserves up to 60%, have the viscous crude of nearly 40% not to be plucked out of after high round is handled up and steam drives.Heavy crude reservoir is after enforcement steam drives, and reservoir temperature, pressure there occurs notable change, and between hole, between remaining oil saturation, well, remaining oil distribution changes the most therewith.But burying shallower due to oil reservoir, reservoir loose cementation so that overlapping damage, screen damage, packer damage or shaking out phenomenon easily occur when exploitation in horizontal well, has a strong impact on the development effectiveness of horizontal well.

Summary of the invention

It is an object of the invention to provide a kind of screen casing for shallow layer thick oil horizontal completion, while facilitating viscous crude Fast Algorithm for Mining, it is to avoid the blocking of screen casing and damage.

The purpose of the present invention is achieved through the following technical solutions:

A kind of screen casing for shallow layer thick oil horizontal completion, including 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, wrapping wire forms an isometrical spirillum along base tube circle to coiling outside multiple described ribs, the foamed iron block in triangle it is filled with between two adjacent ribs, and it is welded with ring for fixing on inwall in the middle part of described isometrical spirillum, rotate on ring for fixing inner peripheral wall and be provided with multiple ball, also include the guide rail of annular, described guide rail runs through in the middle part of multiple ribs along base tube circumference, and have and the annular groove of multiple ball engagement on guide rail outer circle wall；Described wrapping wire is made up of metal support and projection, 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, and the cross section of described projection is circular arc.

When the present invention works, 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, when oil water mixture enters in base tube, the motion of fluid in the whole horizontal completion horizontal segment driven because of oil water mixture motion, and the pressure applied in all directions to wrapping wire on the isometrical spirillum that formed due to fluid in horizontal segment is different, when isometrical spirillum both sides discontinuity equalization, by being mutually slidably matched between ball and annular groove, isometrical spirillum is made to start slowly to rotate outside base tube, and the solid phases such as the sand grains that now part is connected in isometrical spirillum gap can directly drop along with isometrical spirochetal rotation and washing away of oil water mixture, avoid occurring on isometrical spirillum serious clogging, the stability of oil-feed in guarantee base tube；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.

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.

Multiple described balls are rounded and array distribution is on the inner peripheral wall of described ring for fixing.As preferably, multiple balls are evenly distributed on the inner peripheral wall of ring for fixing, i.e. more equalize in the isometrical spirochetal support that wrapping wire is formed, and time freely rotatable outside isometrical spirillum is at base tube, do not result in isometrical spirillum and stress raisers occur, while reducing wrapping wire damage, it is ensured that the oil-feed efficiency in base tube.

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:

1, the present invention is 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；

2, the present invention is 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；

3, the present invention arranges TiALN-WC/C coating at wrapping wire outer wall, 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.

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 longitdinal cross-section diagram of the present invention；

Fig. 3 is the sectional view of wrapping wire.

Labelling and corresponding parts title in accompanying drawing:

1-reinforcement, 2-wrapping wire, 3-ribs, 4-base tube, 5-fuel feed hole, 6-union joint, 7-blind pipe, 8-foamed iron, 9-ring for fixing, 10-guide rail, 11-ball, 12-metal support, 13-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 Figure 1 to Figure 3, the present embodiment includes the base tube 4 having multiple fuel feed hole 5 on outer wall, axially on its outer circle wall, multiple ribs 3 it is provided with along described base tube 4, wrapping wire 2 forms an isometrical spirillum along base tube 4 circle in multiple described outer coilings of ribs 3, the foamed iron 8 block in triangle it is filled with between two adjacent ribs 3, and it is welded with ring for fixing 9 on inwall in the middle part of described isometrical spirillum, rotate on ring for fixing 9 inner peripheral wall and be provided with multiple ball 11, also include the guide rail 10 of annular, described guide rail 10 runs through in the middle part of multiple ribs 3 along base tube 4 circumference, and on guide rail 10 outer circle wall, have the annular groove coordinated with multiple balls 11；Described wrapping wire 2 is made up of metal support 12 and projection 13, the cross section of described metal support 12 is trapezoidal, the going to the bottom as minor face and be connected with ribs 3 of described metal support 12, the upper end of described metal support 12, is long limit and is connected with projection 13, and the cross section of described projection 13 is circular arc.

During work, base tube 4 is placed in the horizontal segment of horizontal completion, and viscous crude enters in the gap of wrapping wire 2 and sleeve pipe formation by wrapping wire 2 gap, after the filtration through foamed iron 8, enters into base tube 4 through fuel feed hole 5 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 4 in horizontal completion horizontal segment internal, wrapping wire 2 is a complete metal bar and is wound on multiple ribs 3 by interval, form the primary filter unit to major diameter solid phases such as gravels in profit, foamed iron 8 then forms the secondary filter unit to minor diameter solid phase, to realize the sand control purpose of base tube 4；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 3 is compressed, but in this secondary filter interval, it is filled with multiple foamed iron 8 block in triangle, foamed iron 8 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 8 inner duct stress generation minor variations and be not easy to be blocked, foamed iron 8 has certain elasticity simultaneously, when elasticity recovery deformation, the duct in foamed iron 8 resets, with the percolation ability in maintenance secondary filter interval, ensure the smooth exploitation of viscous crude.

Further, when oil water mixture enters in base tube 4, the motion of fluid in the whole horizontal completion horizontal segment driven because of oil water mixture motion, and the pressure applied in all directions to wrapping wire 2 on the isometrical spirillum that formed due to fluid in horizontal segment is different, when isometrical spirillum both sides discontinuity equalization, by being mutually slidably matched between ball 11 and annular groove, isometrical spirillum is made to start slowly to rotate outside base tube 4, and the solid phases such as the sand grains that now part is connected in isometrical spirillum gap can directly drop along with isometrical spirochetal rotation and washing away of oil water mixture, avoid occurring on isometrical spirillum serious clogging, the stability of oil-feed in guarantee base tube 4.nullWrapping wire 2 is made up of with projection 13 metal support 12，And the cross section of metal support 12 is trapezoidal，The cross section of projection 13 is circular arc，And metallic supports 12 is as the support member of wrapping wire 2，Its minor face is connected with ribs 3，Long limit is connected with projection 13，A trapezoidal runner is formed between two the most adjacent metallic supports 12 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 13 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 13，Make in oil recovery process，The filtration runner formed on wrapping wire 2 directly will not contact with solid phase，Reduce metallic supports 12 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 12 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 8, after the through hole in blocking foamed iron 8, 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.

The present embodiment also includes that multiple reinforcement 1, multiple described reinforcements 1 axially and are ringwise distributed on wrapping wire 2 along described base tube 4.In the horizontal segment of horizontal completion, wrapping wire 2 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 2 is highly prone to damage, and the present invention is by arranging multiple reinforcement 1 being distributed ringwise on wrapping wire 2 so that the first filter element that wrapping wire 2 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, multiple described balls 11 are rounded and array distribution is on the inner peripheral wall of described ring for fixing 9.Multiple balls 11 are evenly distributed on the inner peripheral wall of ring for fixing 9, i.e. more equalize in the isometrical spirochetal support that wrapping wire 2 is formed, and when isometrical spirillum is freely rotatable outside base tube 4, do not result in isometrical spirillum and stress raisers occur, while reducing wrapping wire 2 damage, it is ensured that the oil-feed efficiency in base tube 4.

As preferably, at wrapping wire 2 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 2, can greatly reduce frictional dissipation between the two, and with self lubricity, greatly ensure the wrapping wire 2 service life in horizontal completion.

As preferably, the needs recovered the oil according to reality, base tube 4 is connected with blind pipe 7 by union joint 6, facilitate the pumping of crude oil, and the mode that abandoning tradition blind pipe 7 directly welds with base tube 4 when laying, directly change wrapping wire 2 when wrapping wire 2 damages to facilitate and base tube 4, wrapping wire 2 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

null1. the screen casing for shallow layer thick oil horizontal completion，Including the base tube (4) having multiple fuel feed hole (5) on outer wall，It is characterized in that: axially on its outer circle wall, be provided with multiple ribs (3) along described base tube (4)，Wrapping wire (2) forms an isometrical spirillum along base tube (4) circle in the outer coiling of multiple described ribs (3)，The foamed iron (8) block in triangle it is filled with between two adjacent ribs (3)，And in the middle part of described isometrical spirillum, on inwall, it is welded with ring for fixing (9)，Rotate on ring for fixing (9) inner peripheral wall and be provided with multiple ball (11)，Also include the guide rail (10) of annular，Described guide rail (10) runs through multiple ribs (3) middle part along base tube (4) circumference，And on guide rail (10) outer circle wall, have the annular groove coordinated with multiple balls (11)；Described wrapping wire (2) is made up of metal support (12) and projection (13), the cross section of described metal support (12) is trapezoidal, the going to the bottom as minor face and be connected with ribs (3) of described metal support (12), the upper end of described metal support (12), is long limit and is connected with projection (13), and the cross section of described projection (13) is circular arc.
A kind of screen casing for shallow layer thick oil horizontal completion the most according to claim 1, it is characterised in that: also include that multiple reinforcement (1), multiple described reinforcements (1) axially and are ringwise distributed on wrapping wire (2) along described base tube (4).
A kind of screen casing for shallow layer thick oil horizontal completion the most according to claim 1, it is characterised in that: on described wrapping wire (2) outer wall, scribble TiALN-WC/C layer.
A kind of screen casing for shallow layer thick oil horizontal completion the most according to claim 1, it is characterised in that: also including union joint (6), the two ends of described base tube (4) are connected with blind pipe (7) by union joint (6) respectively.
A kind of screen casing for shallow layer thick oil horizontal completion the most according to claim 1, it is characterised in that: multiple described balls (11) are rounded and array distribution is on the inner peripheral wall of described ring for fixing (9).
The sand control screen of horizontal completion the most according to claim 1, it is characterised in that: the angle that the vertical line of the hypotenuse of described metal support (12) and described base tube (4) axis is formed is 15 ° ~ 20 °.