CN113638720A - Intelligent self-plugging-removing sand control screen pipe and using method thereof - Google Patents
Intelligent self-plugging-removing sand control screen pipe and using method thereof Download PDFInfo
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- CN113638720A CN113638720A CN202111206868.3A CN202111206868A CN113638720A CN 113638720 A CN113638720 A CN 113638720A CN 202111206868 A CN202111206868 A CN 202111206868A CN 113638720 A CN113638720 A CN 113638720A
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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
Abstract
The invention relates to the technical field of screen pipe sand control completion in oil and gas exploitation, in particular to an intelligent self-plugging removal sand control screen pipe and a use method thereof, wherein the intelligent self-plugging removal sand control screen pipe comprises a base pipe, an outer protection cover, a filter screen and an inflow controller, the filter screen and the outer protection cover are sequentially sleeved outside the base pipe from inside to outside, and an annular space is arranged between the base pipe and the filter screen; the invention keeps the flow capacity without sand invasion in the initial production stage by closing part of the flow channel of the filter screen, and after the sand bridge is formed in the later stage of blockage, the filter screen is opened by fluid pressure, the opening mode is simple and easy, and partial flow can be released, so that the better flow capacity still exists in the later stage of production.
Description
Technical Field
The invention belongs to the technical field of screen pipe sand control completion in oil and gas exploitation, and particularly relates to an intelligent self-plugging removal sand control screen pipe.
Background
The weakly cemented loose sandstone reservoir which is easy to produce sand is widely distributed in the world and has huge development potential, and is one of the main targets of oil and gas exploitation. The problem of sand production is always a difficult problem for restricting the efficient exploitation of a sand production reservoir of weakly cemented loose sandstone, and the sand produced by a stratum is carried into an oil well production section by fluid and can cause a series of negative effects such as shaft blockage, equipment abrasion and the like, so that the sand control is an important technical means for oil and gas development of the loose sandstone reservoir.
The sand control screen pipe is one of the main sand control tools, and the problems existing at present mainly comprise: (1) the risk of serious blockage is faced under the impact of stratum incoming flow sand-carrying, the permeability of the sieve tube is rapidly reduced after blockage, more than 90% of permeability damage can be caused, the yield is reduced, and the benefit of oil field production is influenced. (2) For the problem of blockage of the sand control screen pipe, the existing measures comprise well backwashing, plugging agent annotation and the like, the blockage removing efficiency is low, the cost is high, and targeted sand control blockage removing optimization measures are lacked.
Aiming at the plugging problem, the explanation of the current screen pipe sand blocking medium plugging is mainly the combined action of two plugging mechanisms of an inner bridge frame and an outer sorting bridge frame: (1) and (3) a bridge frame plugging mechanism in the sand blocking medium of the sieve tube. As shown in fig. 1, stratum sand particles lower than the sand blocking precision of the medium invade the inside of the medium, and the finer part of the stratum sand passes through a sand blocking medium layer; and the thicker particles are difficult to break through and are retained in the inner parts of the sand blocking medium pores to form bridge blockage in the sand blocking medium of the sieve tube, so that the permeability of the sand blocking medium is reduced. (2) And (3) a bridge plugging mechanism is selected outside the sieve tube. At the initial stage of production, sand grains higher than the sand blocking precision of the medium are difficult to invade the medium, can be blocked on the surface of the sieve tube in the form of a sorting bridge frame, and become a new sand blocking layer after accumulating to reach a certain thickness, and the pore throat structure of the sand blocking layer is smaller than the pore throat size of the sand blocking medium of the sieve tube, so that finer stratum sand can be blocked. By analogy, the stable sand control effect can be realized.
Disclosure of Invention
The invention aims to solve the problems and provides an intelligent self-plugging-removing sand control screen pipe and a using method thereof.
In order to solve the above problems, the present invention provides the following technical solutions: an intelligent self-plugging-removing sand control screen pipe comprises a base pipe, an outer protection cover, a filter screen and an inflow controller, wherein the filter screen and the outer protection cover are sequentially sleeved outside the base pipe from inside to outside, and an annular space is arranged between the base pipe and the filter screen; the base pipe is provided with a plurality of base pipe holes and an inflow controller, and the inflow controller is used for controlling the conduction and the closing between the filter screen and the inner cavity of the base pipe.
Furthermore, the inflow controller comprises a baffle, a limiter and a support frame, an inflow channel is arranged on the support frame, the limiter is arranged on the support frame and located on the outer side of the inflow channel, the limiter is used for supporting the baffle to be tightly attached to the filter screen, a limiter is arranged at the inner end of the support frame and used for limiting the position of the baffle moving inwards.
Furthermore, the support frame comprises support rods and a mounting ring, the mounting ring is matched with a controller mounting hole of the base tube, and the mounting ring is connected with the four uniformly distributed support rods; the upper end and the lower end of each of the four support rods are respectively welded with a limiter and a limiter; the baffle is disposed above the restrictor in a closed state of the inflow control device.
Further, the baffle comprises a rubber layer and a metal layer, and the baffle is erected on the limiter and is tightly attached to the upper inflow controller filter screen part. Preferably, the rubber layer is arc-shaped and is matched with the inner wall of the upper filter screen.
Further, the limiter is a strip-shaped metal short strip.
Further, the shape of the baffle and the mounting ring is circular. Preferably, the baffle and the mounting ring are oval or rectangular in shape, and can be changed into any suitable shape according to factors such as actual manufacturing cost, use number, influence of the arrangement of mounting holes on the strength of the base pipe and the like.
Preferably, the base pipe is formed by processing a standard oil pipe or a sleeve, base pipe holes penetrating through the pipe wall are formed in the base pipe, the base pipe holes are circular, the base pipe holes are uniformly distributed in the pipe wall of the base pipe, the hole density of the base pipe holes is 30-100 holes/meter, the diameter of the base pipe holes is 8-10mm, and the base pipe holes are mainly used for ensuring the overall strength of the sieve pipe and providing an oil-gas inflow channel.
Preferably, the material of outer safety cover is 304 steel, and thickness is 1-2 mm. The filter screen is a precision filter screen made of 316L steel, and the ratio of the nominal precision to the formation sand is 0.7-1.
Furthermore, the inflow controller adopts an aboveground control opening mode, an electric control switch is arranged at the position of the mounting ring, the expansion of the limiter above the baffle is controlled by the steering engine, used for removing the support of the limiter to the baffle plate, the limiter is made of 316L steel used by a long strip plate, the upper part of the supporting leg is hollow, a steering engine is arranged in the supporting leg, a motor shaft of the steering engine is vertically arranged, the steering engine is a position (angle) servo driver, a disc is arranged on the motor shaft of the steering engine, the limiter is vertically arranged with the supporting leg and can retract into a space controlled in the upper part of the supporting leg, the disc can drive the limiter to extend and retract, an electric control switch can be selectively controlled on the ground, the steering engine is electrically connected with the electric control switch, the electric control switch is electrically connected with a ground control switch or wirelessly connected, and after the production of the oil well is stable, the inflow controller of the high permeability area is preferentially started according to the logging curve.
The use method of the intelligent self-plugging-removing sand control screen pipe comprises the following steps:
step 1, before the screen pipe is put into a well, an inflow controller is installed on a base pipe of the screen pipe, and a flow passage of a part of area of a screen net of the inflow controller is closed in the early production stage, so that the part of area of the screen net is not invaded by sand and keeps the flow capacity in the early production stage. According to the physical property of an oil reservoir and the blocking degree of a medium, an inflow controller is installed in a controller installation hole on a base pipe, the seepage capability of a filter screen part of the inflow controller is reserved in the early stage of formation of a sand bridge, the inflow controller is opened after the pressure reaches a set value after the sand bridge is formed, the seepage capability of the filter screen part of the inflow controller is released, and the opening pressure of the inflow controller is calculated according to the predicted blocking degree;
the baffle plate of the inflow controller comprises a rubber layer and a metal layer, is erected on the limiter and is tightly attached to the upper inflow controller filter screen part, ensures that the upper inflow controller filter screen part is fully attached and does not damage a screen structure, enables the inflow controller filter screen part in the area to have no flowing capacity, and therefore, the permeability of the inflow controller filter screen part cannot be lost due to sand erosion in the early production stage, and has a surface area meeting the requirement
In the formula (I), the compound is shown in the specification,
is the outside diameter of the sieve tube in m; l is the length of the sieve tube of the section and is in m;
is the surface area of a single baffle plate, unit m2；
The number of inflow controllers on the sieve tube section is unit;
the obtained sand control medium blockage permeability damage rate is predicted, and no dimension exists;
step 2: the sand-carrying liquid passes through the filter screen and the base pipe hole after passing through the outer protective cover and enters the pipeline, gravel is blocked on the surface of the filter screen and is deposited to gradually block the filter screen, a sand bridge forms a new sand blocking layer at the later stage of production, at the moment, part or all of the inflow controllers are opened, the inflow controllers are controlled to be opened in an annular pressure mode, the shearing failure pressure of the limiters is far higher than the production pressure difference, the reasonable shearing failure time of the limiters is determined according to the stability degree of the sand bridge, the limiters can be selected to be sheared and broken after the oil well yield is gradually balanced, fluid is rapidly extruded into the annular space of the casing after the minimum sand bridge stabilization time is reached to enable the internal and external pressure difference of the sieve pipe to reach the shearing failure range of the limiters, the damage baffles slide inwards and are controlled by the limiters, so that the flow capacity of the filter screen part of the inflow controllers above is opened, and the liquid mainly flows into the controllers through the filter screen part of the inflow controllers and flows into the base pipe through gaps of the supporting frames, the filter screen capable of flowing is gradually blocked in the production process, a sand blocking bridge structure is formed above the filter screen, the sand bridge gradually expands to the whole area along with the continuous production and particle movement, and the sand bridge bears the main sand blocking capacity at the moment, so that the filter screen part of the inflow controller can avoid blocking in a medium, and the limiter is a long-strip-shaped metal short strip, and the calculation formulas of the shearing failure pressure of the limiter are shown in (2) and (3);
in the formulas (2) and (3),
shear failure pressure for the restrictor, in MPa;
the highest pressure difference inside and outside the sieve tube after medium blockage balance is unit MPa;
for the limiter opening pressure margin, in MPa, it is generally recommended
>2 MPa; q is the amount of liquid produced in m3/d;
is the fluid viscosity in mpa.s;
the inner diameter of the sieve tube is unit m;
in order to achieve permeability after plugging balance, unit D is that under the action of a new sand blocking layer formed by a sand bridge, a filter screen part corresponding to the inflow controller cannot be plugged, so that the screen pipe still has good flowing capacity in the later production stage.
In the step 1-2, the intelligent self-plugging removal type sand control screen pipe is applied to a strong-heterogeneity loose sandstone reservoir, the intelligent self-plugging removal type sand control screen pipe is applied to an oil production well, a local plugging hot spot can be formed under the condition that local area rapid inflow exists in the strong-heterogeneity loose sandstone reservoir, and an inflow controller is difficult to open through annular pressurization; the device is controlled to be opened by adopting an aboveground electric control switch mode, an electric control switch is arranged at the position of the mounting ring and used for removing the support of the limiter on the baffle plate, the limiter is made of 316L steel materials, an original shearing failure pressure calculation method is not adopted, the electric control switch can be selectively controlled on the ground, and the inflow controller in a high permeability area is preferentially opened according to a logging curve after the oil well is stable in production.
Compared with the prior art, the invention has the beneficial effects that:
1. aiming at the problem of severe blockage and yield reduction of a sand control screen pipe under the impact of stratum incoming flow and sand, the invention closes the flow channel of a part of area of the screen net in the initial production stage by arranging a plurality of inflow controllers on a base pipe, so that the part of area of the screen net is not invaded by sand in the initial production stage and keeps the flow capacity, and in the later production stage, a sand bridge forms a new sand blocking layer, the pore throat structure of the sand blocking layer is smaller than the pore throat size of the screen net, so that finer stratum sand can be blocked, at the moment, part or all of the inflow controllers are opened, and the screen net corresponding to the part of inflow controllers cannot be blocked under the action of the new sand blocking layer formed by the sand bridge, so that the screen pipe still has better flow capacity in the later production stage, and the blocked productivity can be recovered by more than 40 percent according to the simulation result.
2. The inflow controller can be opened in an annular pressurizing mode, and the opening mode is simple and easy.
3. The intelligent self-plugging-removing sand control screen pipe parameter design provided by the invention is combined with the simulation of the working condition at the bottom of the well, so that the quantity and the parameter personalized design of inflow controllers are performed in a targeted manner, and a better plugging removing effect can be obtained.
4. The invention provides a design method for ground control deblocking aiming at a sand production well of a strong heterogeneity stratum.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the plugging rule of an inner bridge and an outer bridge of a screen pipe sand blocking medium provided by the present application;
FIG. 2 is a schematic cross-sectional view of an in-flow controller provided herein;
FIG. 3 is a schematic view of the flow conditions when the in-flow controller is closed;
FIG. 4 is a schematic illustration of the sand bridge development process with the inflow controller shut off;
FIG. 5 is a schematic view of the flow conditions after the in-flow controller is turned on;
fig. 6 is a schematic structural diagram of an electrically controlled open-type inflow controller.
Reference numerals: 1. a support bar; 2. a mounting ring; 3. a limiter; 4. a stopper; 5. a baffle plate; 6. a base pipe; 7. filtering with a screen; 8. an outer protective cover; 9. a base tube aperture; 10. a sand bridge; 11. an electric control switch; 12. a controller mounting hole; 51. a rubber layer; 52. a metal layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 2-6
Example one
The invention provides the following technical scheme: an intelligent self-plugging-removing sand control screen pipe comprises a base pipe 6, an outer protection cover 8, a filter screen 7 and an inflow controller, wherein the filter screen 7 and the outer protection cover 8 are sequentially sleeved outside the base pipe 6 from inside to outside, and an annular space is arranged between the base pipe 6 and the filter screen 7; the base pipe 6 is provided with a plurality of base pipe holes 9 and an inflow controller, and the inflow controller is used for controlling the conduction and the closing between the filter screen 7 and the inner cavity of the base pipe 6.
The inflow controller comprises a baffle 5, a limiter 3 and a support frame, an inflow channel is arranged on the support frame, the limiter 3 is arranged on the support frame and located on the outer side of the inflow channel, the limiter 3 is used for supporting the baffle 5 to be tightly attached to a filter screen, a limiter 4 is arranged at the inner end of the support frame, and the limiter 4 is used for limiting the position of the baffle 5 moving inwards. The support frame comprises support rods 1 and a mounting ring 2, the mounting ring 2 is matched with a controller mounting hole 12 of the base tube 6, and the mounting ring 2 is connected with the four uniformly distributed support rods 1; the upper end and the lower end of each of the four support rods 1 are respectively welded with a limiter 3 and a limiter 4; the baffle 5 is arranged above the restrictor 3 in the closed position of the inflow control device.
The baffle 5 comprises a rubber layer 51 and a metal layer 52, and the baffle 5 is mounted on the restrictor and closely attached to the upper inflow controller screen 7 portion. Preferably, the rubber layer 51 is arc-shaped and matched with the inner wall of the upper filter screen 7. The limiter 3 is a long metal strip, and the limiter 3 can be cut in an annular pressurizing mode.
The baffle 5 and the mounting ring 2 are circular in shape. Preferably, the baffle 5 and the mounting ring 2 are oval or rectangular in shape, and can be changed into any suitable shape according to factors such as actual manufacturing cost, number of use, influence of the arranged mounting holes on the strength of the base pipe and the like.
The base pipe 6 adopts standard oil pipe or sleeve pipe processing to form, sets up the base pipe hole 9 that runs through the pipe wall on the base pipe 6, and base pipe hole 9 is circular, and base pipe hole 9 is at the pipe wall evenly distributed of base pipe 6, and the hole density of base pipe hole 9 is 30-100 holes/meter, and the diameter is 8-10mm, and the main function of base pipe 6 and base pipe hole 9 provides the oil gas inflow passageway for guaranteeing screen pipe bulk strength. The outer protective cover is made of 304 steel and has the thickness of 1-2 mm. The filter screen 7 is a precision filter screen made of 316L steel, and the ratio of the nominal precision to the formation sand is 0.7-1.
The inflow controller is controlled to be opened by adopting an aboveground electric control switch mode, an electric control switch is arranged at the position of the mounting ring, the expansion of the limiter above the baffle is controlled by the steering engine, used for removing the support of the limiter to the baffle plate, the limiter is made of 316L steel used by a long strip plate, the upper part of the supporting leg is hollow, a steering engine is arranged in the supporting leg, a motor shaft of the steering engine is vertically arranged, the steering engine is a position (angle) servo driver, a disc is arranged on the motor shaft of the steering engine, the limiter is vertically arranged with the supporting leg and can retract into a space controlled in the upper part of the supporting leg, the disc can drive the limiter to extend and retract, an electric control switch can be selectively controlled on the ground, the steering engine is electrically connected with the electric control switch, the electric control switch is electrically connected with a ground control switch or wirelessly connected, and after the production of the oil well is stable, the inflow controller of the high permeability area is preferentially started according to the logging curve.
The use method of the intelligent self-plugging-removing sand control screen pipe comprises the following steps:
step 1, before the screen pipe is put into a well, an inflow controller is installed on a base pipe of the screen pipe, and a flow passage of a part of area of a screen net of the inflow controller is closed in the early production stage, so that the part of area of the screen net is not invaded by sand and keeps the flow capacity in the early production stage. According to the physical property of an oil reservoir and the blocking degree of a medium, an inflow controller is installed in a controller installation hole on a base pipe, the seepage capability of a filter screen part of the inflow controller is reserved in the early stage of formation of a sand bridge, the inflow controller is opened after the pressure reaches a set value after the sand bridge is formed, the seepage capability of the filter screen part of the inflow controller is released, and the opening pressure of the inflow controller is calculated according to the predicted blocking degree;
the baffle 5 of the inflow controller comprises a rubber layer 51 and a metal layer 52, is erected on the limiter 3 and is tightly attached to the upper inflow controller screen part, ensures that the upper inflow controller screen part is fully attached and does not damage the wire mesh structure, enables the inflow controller screen part in the area not to have flow capacity, and therefore cannot lose permeability due to sand erosion in the early production period, and the surface area of the baffle 5 is sufficient
In the formula (I), the compound is shown in the specification,
is the outside diameter of the sieve tube in m; l is the length of the sieve tube of the section and is in m;
is the surface area of a single baffle plate, unit m2；
The number of inflow controllers on the sieve tube section is unit;
the obtained sand control medium blockage permeability damage rate is predicted, and no dimension exists; and the following reference of calculation of permeability after blockage, "DongChang silver. Sand prevention well sand blocking medium blockage law experiment and blockageQuantitative prediction model of degree of plugging [ J ]]Experimental mechanics 2017.3 ";
step 2: the sand-carrying liquid passes through the filter screen 7 and the base pipe hole 9 to enter the pipeline after passing through the outer protective cover 8, gravel is blocked on the surface of the filter screen 7 and deposited to gradually form a blocked filter screen, a sand bridge forms a new sand blocking layer in the later production period, at the moment, part or all of the inflow controllers are opened, the inflow controllers are controlled to be opened in an annular pressure mode, the shearing failure pressure of the restrictors 3 is far higher than the production pressure difference, the reasonable shearing failure time of the restrictors 3 is determined according to the stability degree of the sand bridge, the restrictors 3 can be selected to be damaged after the oil well yield is gradually balanced, fluid is rapidly extruded into the annular space of the casing after the minimum sand bridge stabilization time is reached, so that the pressure difference between the inside and the outside of the sieve pipe reaches the shearing failure range of the restrictors 3, the restrictors 3 are damaged, the baffle plates 5 slide inwards and are controlled by the limit 4, and the flow capacity of the filter screen part of the inflow controllers above is opened, liquid mainly flows into the controller through the filter screen part of the inflow controller and flows into the base pipe 6 through the gap of the support frame, the filter screen capable of flowing is gradually blocked in the production process, a sand blocking bridge structure is formed above the filter screen, the sand bridge gradually expands to the whole area along with the continuous production and particle movement, and the filter screen part of the inflow controller can avoid the blockage in the medium due to the fact that the sand bridge bears the main sand blocking capacity at the moment, so that the inflow controller has high flowing performance, the limiter is a long-strip-shaped metal short strip, and the calculation formulas of the shearing failure pressure of the limiter are shown as (2) and (3);
in the formulas (2) and (3),
shear failure pressure for the restrictor, in MPa;
the highest pressure difference inside and outside the sieve tube after medium blockage balance is unit MPa;
for the limiter opening pressure margin, in MPa, it is generally recommended
>2 MPa; q is the amount of liquid produced in m3/d;
is the fluid viscosity in mpa.s;
the inner diameter of the sieve tube is unit m;
in order to achieve permeability after plugging balance, unit D is that under the action of a new sand blocking layer formed by a sand bridge, a filter screen part corresponding to the inflow controller cannot be plugged, so that the screen pipe still has good flowing capacity in the later production stage.
In the step 1-2, the intelligent self-plugging removal type sand control screen pipe is applied to a strong-heterogeneity loose sandstone reservoir, the intelligent self-plugging removal type sand control screen pipe is applied to an oil production well, a local plugging hot spot can be formed under the condition that local area rapid inflow exists in the strong-heterogeneity loose sandstone reservoir, and an inflow controller is difficult to open through annular pressurization; the opening is controlled by adopting an aboveground electric control switch mode, the electric control switch 11 is arranged at the position of the mounting ring 2 and used for removing the support of the limiter 3 on the baffle 5, the limiter is made of 316L steel materials, an original shearing failure pressure calculation method is not adopted, the electric control switch 11 can be selectively controlled on the ground, and the inflow controller in a high permeability area is preferentially opened according to a logging curve after the oil well is stably produced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides an intelligence is from unblock sand control screen pipe which characterized in that: the device comprises a base pipe (6), an outer protective cover (8), a filter screen (7) and an inflow controller, wherein the filter screen (7) and the outer protective cover (8) are sequentially sleeved outside the base pipe (6) from inside to outside, and an annular space is arranged between the base pipe (6) and the filter screen (7); the base pipe (6) is provided with a plurality of base pipe holes (9) and an inflow controller, and the inflow controller is used for controlling the conduction and the closing between the filter screen (7) and the inner cavity of the base pipe (6).
2. The intelligent self-plugging-removing sand control screen according to claim 1, wherein: the inflow controller comprises a baffle (5), a limiter (3) and a support frame, an inflow channel is arranged on the support frame, the limiter (3) is arranged on the support frame and located on the outer side of the inflow channel, and the limiter (3) is used for supporting the baffle (5) to be attached to the filter screen.
3. The intelligent self-plugging-removing sand control screen according to claim 2, wherein: the inner end of the support frame is provided with a limiting stopper (4), and the limiting stopper (4) is used for limiting the inward movement position of the baffle (5).
4. The intelligent self-plugging-removing sand control screen according to claim 2, wherein: the baffle (5) comprises a rubber layer (51) and a metal layer (52).
5. The intelligent self-plugging-removing sand control screen according to claim 2, wherein: the limiter (3) is a metal strip.
6. The intelligent self-plugging-removing sand control screen according to claim 5, wherein: the base pipe (6) are processed by adopting a standard oil pipe or a sleeve, base pipe holes (9) penetrating through the pipe wall are formed in the base pipe (6), the base pipe holes (9) are circular, the base pipe holes (9) are uniformly distributed on the pipe wall of the base pipe (6), the hole density of the base pipe holes (9) is 30-100 holes/meter, the diameter of the base pipe holes is 8-10mm, the outer protection cover (8) is made of 304 steel and 1-2mm in thickness, the filter screen (7) is a precise filter screen, the material is 316L steel, and the ratio of the nominal precision to the formation sand is 0.7-1.
7. The method for using the intelligent self-plugging-removing sand control screen according to any one of claims 1 to 6, characterized by comprising the following steps:
step 1: before the sieve tube is put into the well, an inflow controller is arranged on a base tube (6) of the sieve tube, and a flow passage of a filter screen part area corresponding to the inflow controller is closed at the initial production stage;
step 2: in the later period of production, the sand bridge forms a new sand blocking layer, and at the moment, part or all of the inflow controllers are opened.
8. The use method of the intelligent self-plugging-removing sand control screen pipe according to claim 7, wherein the method comprises the following steps: in step 1, when the inflow controller is installed, the baffle is erected on the limiter and is tightly attached to the upper inflow controller filter screen part, so that the upper inflow controller filter screen part is fully attached and the wire mesh structure is not damaged, and the surface area of the baffle is required to meet the requirement
In the formula (I), the compound is shown in the specification,
is the outside diameter of the sieve tubeA bit m; l is the length of the sieve tube of the section and is in m;
is the surface area of a single baffle plate, unit m2；
The number of inflow controllers on the sieve tube section is unit;
the obtained sand control medium blockage permeability damage rate is predicted, and no dimension exists;
in step 2, when opening part or all of the inflow controllers, the inflow controllers are controlled to be opened in an annular pressurizing mode, the shearing failure pressure of the limiters is higher than the production pressure difference, the shearing failure limiters can be selected after the oil well yield is gradually balanced, fluid is squeezed into the annular space of the casing after the minimum sand bridge stabilization time is reached, the pressure difference between the inside and the outside of the sieve tube reaches the shearing failure range of the limiters, the damage baffles of the limiters slide inwards and are controlled by the limiters, and the shearing failure pressure calculation formulas of the limiters are shown in (2) and (3);
in the formulas (2) and (3),
shear failure pressure for the restrictor, in MPa;
the highest pressure difference inside and outside the sieve tube after medium blockage balance is unit MPa;
for the limiter opening pressure margin, in MPa, it is generally recommended
>2 MPa; q is the amount of liquid produced in m3/d;
is the fluid viscosity in mpa.s;
the inner diameter of the sieve tube is unit m;
permeability after plug equilibration, unit D.
9. The use method of the intelligent self-plugging-removing sand control screen pipe according to claim 7, wherein the method comprises the following steps: and in the step 2, the inflow controller is controlled to be started in an aboveground electric control switch mode.
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| CN113638720B (en) | 2022-01-04 |
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