Immovable tubular column layered extrusion and circulating filling sand control tubular column and use method of immovable tubular column layered extrusion and circulating filling sand control tubular column

Abstract

The invention discloses an immovable string layered extrusion and circulating filling sand control string and a use method thereof, the immovable string layered extrusion and circulating filling sand control string comprises a suspension packer arranged on an oil pipe and a packing sand control unit below the suspension packer, and further comprises a filling unit arranged on the oil pipe; the packing sand prevention unit comprises an interlayer separator arranged on the oil pipe, an upper sand prevention pipe and a lower sand prevention pipe, wherein the upper sand prevention pipe and the lower sand prevention pipe are arranged above and below the interlayer separator respectively. A first filling unit is arranged between the hanging packer and the upper sand prevention pipe, and a second filling unit is arranged below the lower sand prevention pipe. After well completion, holes where sand possibly enters are blocked, the sand prevention effect is improved, one-time construction, layered extrusion and circulating filling are conducted on multiple oil layers and the immovable pipe column at the same time, the technical problem of multi-oil-layer construction safety is solved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield sand filling and sand control, in particular to a fixed pipe column layered extrusion and cyclic filling sand control pipe column and a use method thereof. Background Art

[0002] At the mining site of the oil industry, during the crude oil extraction process, the formation sand in the oil layer is easy to flow into the wellbore along with the crude oil, causing the formation skeleton structure to be destroyed and the sand production to be aggravated, resulting in formation loss and collapse. At the same time, the sand buries the oil layer, preventing the crude oil from flowing into the casing and being unable to be mined, and also damaging the oil production equipment and oil pipelines.

[0003] Publication (announcement) number: CN113404441A, a multi-layer filling sand control and stratified injection and production integrated pipe string and its use method, the inner pipe string is located in the outer pipe string; the top isolation assembly, the bypass flow screen assembly, the isolation packer assembly, the bypass flow screen assembly and the bottom isolation assembly are connected in sequence from top to bottom; the head end of the delivery tool is connected to the drill pipe or the oil pipe, the tail end of the delivery tool is connected to the head end of the flushing pipe, the tail end of the flushing pipe is connected to the head end of the insertion center pipe, and the insertion center pipe can be inserted into the head end of the filling tool.

[0004] The sand control measures of the prior art are insufficient, and gravel will enter the pipe from the bottom wire plug after well completion. The sand control effect of the prior art is not as good as that of the present invention.

[0005] Publication (announcement) number: CN115853471A, a horizontal well sealing and filling combined production process pipe string, including an upper joint, a liquid cylinder, a central pipe, a seat sealing shear nail, a rubber cylinder, a slip, a filling return liquid and backwash well channel, a filling port pin, a filling channel, a filling port sliding sleeve, an external filling port closing mechanism, a backwash interlayer pipe, an internal filling port closing mechanism, a flushing pipe, a safety joint, a screen pipe, a backwash valve, a rubber cylinder, a bottom packer, and an external sand flushing device.

[0006] The sand control measures of the prior art are insufficient, and gravel will enter the pipe from the bottom wire plug after well completion. The sand control effect of the prior art is not as good as that of the present invention.

[0007] Publication (announcement) number: CN116241223A, a bottom filling tool, a pipe column structure and a filling method, the bottom filling tool includes an upper joint assembly; an assembly sleeve, one end of the assembly sleeve is connected to the upper joint assembly, and the assembly sleeve and the upper joint assembly are coaxially arranged, and the other end of the assembly sleeve is provided with a switch valve for closing or opening the hollow cavity; a wireless control assembly, the wireless control assembly is arranged in the assembly sleeve, and is communicatively connected with the switch valve, when the wireless control assembly receives a switch signal, it can control the switch valve to open or close; a pressure control assembly, the pressure control assembly is arranged in the assembly sleeve, and is electrically connected to the switch valve.

[0008] The sand control measures of the prior art are insufficient, and gravel will enter the pipe from the bottom wire plug after well completion. The sand control effect of the prior art is not as good as that of the present invention.

[0009] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced are all different from the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the invention

[0010] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to seal the holes that may allow sand to enter after well completion, so as to improve the sand prevention effect. At the same time, for multiple oil layers, the pipe string is not moved, and the layered extrusion and cyclic filling are carried out at one time, so as to solve the technical problems of safety in multi-oil layer construction and reduce production costs.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] The fixed pipe string layered extrusion and cyclic filling sand control pipe string comprises a hanging packer arranged on the oil pipe and a sealing and sand control unit below, and is characterized in that it also comprises a filling unit arranged on the oil pipe;

[0013] The isolation and sand control unit comprises an interlayer separator arranged on the oil pipe and an upper sand control pipe and a lower sand control pipe respectively arranged above and below the interlayer separator.

[0014] A first filling unit is arranged between the suspension packer and the upper sand control pipe, and a second filling unit is arranged below the lower sand control pipe.

[0015] The first filling unit comprises an innermost inner conversion, the outer side of the inner conversion is connected to an outer conversion, the outer upper end of the outer conversion is connected to a first stopper sleeve, and the outer side of the first stopper sleeve is connected to a first outer tube;

[0016] The inner conversion and the outer conversion are provided with filling ports separated from the annular wall cavities of the two. The filling ports only connect the inner conversion interior with the oil casing annulus. The first outer pipe is also provided with holes corresponding to the filling ports.

[0017] A sliding sleeve is arranged on the inner side of the inner conversion, and the sliding sleeve just blocks the filling port on the inner conversion. The upper end of the sliding sleeve is a ball seat surface, and a door cover is arranged below the outer filling port of the outer conversion.

[0018] The second filling unit comprises a second outer tube and a thread plug arranged at the lower end of the second outer tube; and also comprises an automatic sealing device arranged in the second outer tube, wherein the thread plug has a hole at the bottom.

[0019] The automatic sealing device includes a hinge plate seat, a hinge sealing plate is provided at the lower end opening of the hinge plate seat, the hinge sealing plate is connected to the hinge plate seat through a hinge shaft, a spring is installed between the hinge shaft and the hinge sealing plate, a sealing insert is provided in the hinge plate seat and passes through the lower end opening of the hinge plate seat to keep the hinge sealing plate in an open state, a ball seat is provided on the inner side of the lower end opening of the sealing insert, and a ball seat surface is provided on the upper end of the sealing insert.

[0020] The isolation and sand control unit comprises an innermost inner flushing pipe, an outer flushing pipe in the middle layer and a third outer pipe in the outermost layer, and also comprises a cup setting tool arranged on the inner side of the interlayer separator;

[0021] The leather cup sealing tool includes a leather cup center tube connected to an outer punch tube, an upper leather cup and a lower leather cup are respectively provided at two ends of the outer side of the leather cup center tube, a through hole is opened in the leather cup center tube between the upper leather cup and the lower leather cup, the lower end of the outer side of the leather cup center tube is connected to a lower leather cup seat, the inner lower end of the lower leather cup seat is connected to a leather cup seat, the inner side of the upper end of the leather cup seat is connected to the inner punch tube, a backwash leather cup is provided on the outer side, and a backwash hole is provided in the middle of the leather cup seat.

[0022] The suspension packer includes a release arm, a center pipe connected to the release arm, and a release sleeve, an upper cone, a suspension slip, a lower cone, a sealing rubber sleeve, a locking ring, a setting piston and a hydraulic cylinder sleeve arranged in sequence from the upper end to the lower end of the center pipe. The inner surface of the locking ring is provided with a one-way tooth buckle, the outer surface of the center pipe is provided with a corresponding tooth buckle, and the center pipe is provided with a connecting hole that connects the center pipe with the annulus of the oil casing.

[0023] The sliding sleeve, the inner conversion, the outer conversion and the central tube are provided with through pressure transmission holes, which transmit the pressure in the tube into the clamping wall cavity and then into the hydraulic cylinder.

[0024] The sliding sleeve is connected to the inner conversion through shear nails; the outer conversion is connected to the first stop sleeve and the door closing sleeve through shear nails; and the ball seat is connected to the sealing insert through shear nails.

[0025] The connection relationship between the suspension packer and the top first filling unit is that the release hand is connected to the inner conversion, the central tube and the hydraulic cylinder are common tubes of the suspension packer and the first filling unit, and in the first filling unit, the central tube is the first stopper sleeve and the hydraulic cylinder is the first outer tube;

[0026] The connection relationship between the first filling unit and the isolation and sand control unit is that the inner conversion is connected to the inner flushing pipe, the outer conversion is connected to the outer flushing pipe, and the first outer pipe is connected to the third outer pipe;

[0027] The connection relationship between the isolation and sand prevention unit and the second filling unit is that the leather cup seat is connected to the sealing insert, and the third outer tube is connected to the second outer tube.

[0028] In one embodiment of the present invention, there are multiple isolation and sand control units, a first filling unit is arranged between the hanging packer and the first upper sand control pipe thereunder, a first filling unit is arranged between each group of lower sand control pipes and the upper sand control pipe, and a second filling unit is arranged below the lower sand control pipe at the bottom of the well.

[0029] In one embodiment of the present invention, the diameter of the steel balls allowed to pass through the ball seat surfaces in the plurality of filling units decreases as the designed depth of the filling units increases.

[0030] In one embodiment of the present invention, the connection relationship between the isolation and sand control unit and the second layer first filling unit is: the inner flushing pipe is connected to the inner conversion, the leather cup seat is connected to the stopper sleeve, and the third outer tube is connected to the first outer tube;

[0031] In one embodiment of the present invention, the connection relationship between the second layer first filling unit and the second layer isolation and sand control unit is that the inner conversion is connected to the inner flushing pipe, the outer conversion is connected to the outer flushing pipe, and the first outer pipe is connected to the third outer pipe;

[0032] In one embodiment of the present invention, a plurality of first filling units and isolation and sand control units may be repeatedly connected.

[0033] In order to achieve the above object, the present invention adopts the following technical solutions:

[0034] The method for using the fixed pipe column layered extrusion and cyclic filling sand control pipe column uses the fixed pipe column layered extrusion and cyclic filling sand control pipe column described in Example 1, and the steps include:

[0035] a. Ground connection and entry:

[0036] Connect the pipe string as required, insert the sealing plug into the hinge sealing plate, and use the oil pipe to lower the entire pipe string into the designed position in the well;

[0037] b. Setting the pipe string:

[0038] Throw the second steel ball onto the ball seat, apply pressure from the wellhead, and the suspension packer is sealed; continue to apply pressure from the tubing to set the interlayer packer and complete the interlayer isolation; apply pressure from the tubing again to knock off the ball seat and open the channel for filling the bottom;

[0039] c. Filling bottom gravel:

[0040] Close the ground casing gate and squeeze gravel into the construction layer under high pressure. After squeezing, open the casing gate to fill the casing annulus;

[0041] d. Filling the upper layer with gravel:

[0042] Throw the third steel ball into the ball seat surface at the upper end of the sealing insert to block it, then throw the first steel ball into the ball seat surface of the sliding sleeve, pressurize the oil pipe to knock off the sliding sleeve and expose the filling port;

[0043] Close the casing gate and squeeze gravel into the construction layer under high pressure. After squeezing, open the casing gate to fill the casing annulus.

[0044] After filling one layer, if the filling is completed, proceed to the next step. If it is not completed, place another suitable steel ball and repeat the pressure filling until the column is filled.

[0045] e. Backwash excess gravel:

[0046] Liquid is pumped into the casing gate, and the liquid enters through the connecting hole of the central tube, enters the inner flushing pipe through the backwash hole, and returns upward to the ground to clean the excess gravel;

[0047] f. Well completion;

[0048] Rotate the pipe column forward to open the reverse buckle of the connection between the release handle and the center pipe, disconnect all the shear nails used for connection, and thus lift out some parts.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] After the well is completed, all oil inlets of the present invention are provided with sand control pipes, and the bottom openings are also blocked, so the sand control effect is good. At the same time, the present invention is used for layered extrusion filling and sand control of multi-oil layer oil wells. During extrusion, other layers are closed and gravel is only extruded at high pressure on the construction layer. After extrusion, the casing gate is opened to fill the circulating oil casing annulus, and then a ball is thrown to open the upper filling sliding sleeve to fill the upper oil layer. The construction safety is effectively improved, and the production cost and the labor intensity of workers are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the upper part of the structure of the fixed pipe column layered extrusion and cyclic filling sand control pipe column of the present invention;

[0052] Figure 2 It is a schematic diagram of the structure of the lower half of the present invention;

[0053] Figure 3 The present invention is Figure 1 Schematic diagram of the cross-sectional structure after cutting at AA in the middle.

[0054] In the figure: 1. first filling unit; 1-1. filling port; 1-2. pressure transmission hole; 2. release sleeve; 3. hanging slip; 4. release handle; 5. center tube; 6. sealing rubber tube; 7. locking ring; 8. setting piston; 9. cylinder sleeve; 10. sandwich wall cavity; 11. door closing sleeve; 12. sliding sleeve; 13. inner conversion; 14. outer conversion; 15. outer flushing pipe; 16. inner flushing pipe; 17. upper sand control pipe; 18. upper leather bowl; 19 Interlayer packer; 20. Leather cup center tube; 21. Leather cup sealing tool; 22. Lower leather cup; 23. Lower leather cup seat; 24. Backwash leather cup; 25. Leather cup seat; 26. Lower sand control pipe; 27. Connecting pipe; 28. Second outer tube; 29. ​​Hinge plate seat; 30. Hinge shaft; 31. Hinge sealing plate; 32. Spring; 33. Second filling unit; 34. Sealing insert; 35. Ball seat; 36. Screw plug; 37. Steel ball. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] See also Figures 1 to 3 The present invention provides a fixed column layered extrusion and cyclic filling sand control column and a method for using the same, comprising a hanging packer arranged on the oil pipe and a sealing and sand control unit below, and also a filling unit arranged on the oil pipe;

[0057] The isolation and sand control unit is an interlayer separator 19 arranged on the oil pipe and an upper sand control pipe 17 and a lower sand control pipe 26 respectively arranged above and below the interlayer separator 19;

[0058] Embodiment 1:

[0059] A first filling unit 1 is provided between the suspension packer and the upper sand control pipe 17, and a second filling unit 33 is provided below the lower sand control pipe 26;

[0060] The first filling unit 1 comprises an innermost inner conversion 13, the outer side of the inner conversion 13 is connected to an outer conversion 14, the upper end of the outer side of the outer conversion is connected to a first stopper sleeve, a first outer tube is arranged outside the first stopper sleeve, the inner conversion 13 and the outer conversion 14 are provided with a filling port 1-1 separated from the annular wall cavity 10 of the two, the filling port 1-1 only connects the inside of the inner conversion 13 with the oil casing annulus, and the first outer tube is also provided with a hole corresponding to the filling port 1-1;

[0061] A sleeve 12 is arranged inside the inner conversion 13, and the sleeve 12 just blocks the filling port 1-1 on the inner conversion 13, so that the inside of the oil pipe is separated from the oil casing annulus. The upper end of the inner side of the sleeve 12 is a ball seat surface, and the sleeve 12 can be sealed by inserting a first rigid ball, and then the sleeve 12 and the inner conversion 13 are separated by pressurization. The falling sleeve 12 sits on the thinning part of the inner conversion 13 to block the oil pipe, so that the mortar is injected into the oil casing annulus from the filling port;

[0062] A door cover 11 is arranged below the outer filling port 1-1 of the outer switch 14. When the first filling tool 1 is raised, the door cover 11 is blocked by the first blocking cover that is not raised and is separated from the outer switch 14, so that the door cover 11 blocks the filling port 1-1.

[0063] The second filling unit 33 includes a second outer tube 28 and a thread plug 36 disposed at the lower end of the second outer tube 28, and also includes an automatic sealing device disposed in the second outer tube 28, and the thread plug 36 has a hole at the bottom;

[0064] The automatic sealing device includes a hinge plate seat 29, a hinge sealing plate 31 is provided at the lower opening of the hinge plate seat 29, and the hinge sealing plate 31 is connected to the hinge plate seat 29 through a hinge shaft 30. A spring 32 is installed between the hinge shaft 30 and the hinge sealing plate, so that the hinge sealing plate 31 automatically covers the lower opening of the hinge plate seat 29. A sealing insert 34 is provided in the hinge plate seat 29 and passes through the lower opening of the hinge plate seat 29, so that the hinge sealing plate 31 is in an open state. A ball seat 35 is provided inside the lower opening of the sealing insert 34, and a second steel ball is placed to seal it, so that a certain pressure can be generated in the oil pipe. When the pressure rises to a certain level, the ball seat 35 is separated from the sealing insert 34.

[0065] The upper end of the sealing insert 34 is provided with a ball seat surface, which can be sealed by inserting a third steel ball;

[0066] The isolation and sand control unit includes an innermost flushing pipe 16, an outer flushing pipe 15 in the middle layer and a third outer pipe in the outermost layer, and also includes a leather cup sealing tool 21 arranged on the inner side of the interlayer separator 19, the leather cup sealing tool 21 includes a leather cup center tube 20 connected to the outer flushing pipe, and the outer ends of the leather cup center tube 20 are respectively provided with an upper leather cup 18 and a lower leather cup 22, and the leather cup center tube 20 has a through hole between the upper leather cup 18 and the lower leather cup 22, and the outer lower end of the leather cup center tube 20 is connected to a lower leather cup seat 23, and the inner lower end of the lower leather cup seat 23 is connected to a leather cup seat 25, the inner side of the upper end of the leather cup seat 25 is connected to the inner flushing pipe 16, and a backwash leather cup 24 is provided on the outer side, and a backwash hole is provided in the middle of the leather cup seat;

[0067] The suspension packer comprises a release hand 4, a central tube 5 connected to the release hand 4, and a release sleeve 2, an upper cone, a suspension slip 3, a lower cone, a sealing rubber tube 6, a locking ring 7, a setting piston 8 and a hydraulic cylinder sleeve 9 arranged in sequence from the upper end to the lower end of the central tube 5. The inner surface of the locking ring 7 has a one-way tooth buckle, and the outer surface of the central tube 5 is provided with a corresponding tooth buckle. In the process of left movement, it can only move forward but not backward. A connecting hole is provided on the central tube 5 to connect the inside of the central tube 5 with the oil casing annulus.

[0068] In the specific implementation of this embodiment, the connection relationship between the suspension packer and the top first filling unit 1 is that the release hand 4 is connected to the inner conversion 13, the central tube 5 and the hydraulic cylinder 9 are the common tubes of the suspension packer and the first filling unit 1, and in the first filling unit 1, the central tube 5 is the first stopper sleeve, and the hydraulic cylinder 9 is the first outer tube;

[0069] The connection relationship between the first filling unit 1 and the isolation and sand control unit is that the inner switch 13 is connected to the inner flushing pipe 16, the outer switch 14 is connected to the outer flushing pipe 15, and the first outer pipe is connected to the third outer pipe;

[0070] The connection relationship between the isolation and sand prevention unit and the second filling unit 33 is that the leather cup seat 25 is connected to the sealing insert 34 , and the third outer tube is connected to the second outer tube 28 .

[0071] The sliding sleeve 12, the inner switch 13, the outer switch 14 and the central tube 5 are provided with through pressure transmission holes 1-2 to transmit the pressure in the tube into the clamping wall cavity 10 and into the hydraulic cylinder 9. The flow rate of the pressure transmission hole is very small and is only used to transmit pressure.

[0072] The sliding sleeve 12 is connected to the inner conversion 13 via shear nails; the outer conversion 14 is connected to the first stop sleeve and the door closing sleeve 11 via shear nails; the ball seat 35 is connected to the sealing insert 34 via shear nails.

[0073] Embodiment 2:

[0074] There are multiple isolation and sand control units, a first filling unit 1 is arranged between the suspension packer and the first upper sand control pipe 17 below it, a first filling unit 1 is arranged between each group of lower sand control pipes 26 and the upper sand control pipe 17, and a second filling unit 33 is arranged below the lower sand control pipe 26 at the bottom of the well;

[0075] In the specific implementation of this embodiment, the connection relationship between the suspension packer and the top first filling unit 1 is that the release hand 4 is connected to the inner conversion 13, the central tube 5 and the hydraulic cylinder 9 are the common tubes of the suspension packer and the first filling unit 1, and in the first filling unit 1, the central tube 5 is the first stopper sleeve, and the hydraulic cylinder 9 is the first outer tube;

[0076] The connection relationship between the top first filling unit 1 and the isolation and sand control unit is that the inner conversion 13 is connected to the inner flushing pipe 16, the outer conversion 14 is connected to the outer flushing pipe 15, and the first outer pipe is connected to the third outer pipe;

[0077] The connection relationship between the isolation and sand control unit and the second layer first filling unit 1 is: the inner flushing pipe 16 is connected to the inner conversion 13, the leather cup seat 25 is connected to the stopper sleeve, and the third outer tube is connected to the first outer tube;

[0078] The connection relationship between the second layer first filling unit 1 and the second layer isolation and sand control unit is that the inner conversion 13 is connected to the inner flushing pipe 16, the outer conversion 14 is connected to the outer flushing pipe 15, and the first outer pipe is connected to the third outer pipe;

[0079] Multiple first filling units 1 and isolation and sand control units can be repeatedly connected;

[0080] The connection relationship between the bottom isolation and sand control unit and the second filling unit 33 is that the leather cup seat 25 is connected to the sealing insert 34 , and the third outer tube is connected to the second outer tube 28 .

[0081] When the present invention is used on site, the following steps are followed:

[0082] Using the fixed pipe string described in Example 1 for layered extrusion and cyclic filling of the sand control pipe string;

[0083] a. Ground connection and entry:

[0084] Connect the pipe string as required, insert the sealing plug 34 into the hinge sealing plate 31, and use the oil pipe to lower the entire pipe string into the designed position in the well;

[0085] b. Setting the pipe string:

[0086] The second steel ball is thrown onto the ball seat 35, and pressure is applied from the wellhead. The liquid pressure enters the cylinder sleeve 9 through the pressure transmission hole 1-2, pushing the setting piston 8 to move leftward, compressing the sealing rubber tube 6 and the upper and lower cones to clamp the hanging slip 5 tightly on the casing wall, and at the same time compressing and expanding the sealing rubber tube 6 to tightly stick to the casing wall to complete the sealing. The sealing rubber tube 6 divides the oil casing annulus into the upper oil casing annulus and the lower casing annulus, and the suspension packer is sealed;

[0087] Continue to pressurize the oil pipe, and the liquid pressure enters the sandwich wall cavity 10 through the sliding sleeve 12 and the inner conversion 13, and then reaches the through hole of the leather cup center pipe 20 through the annulus of the outer punch pipe 15 and the inner punch pipe 16, and enters the interlayer packer 19, so that the interlayer packer 19 is set and the interlayer isolation is completed.

[0088] Then, the oil pipe is pressurized to knock off the ball seat 35 and open the channel for filling the bottom;

[0089] c. Filling bottom gravel:

[0090] During filling, if the ground casing gate is closed, mortar enters the oil layer from the hole on the wire plug 36, and the gravel is squeezed on the construction layer with high pressure. If the casing gate is opened, the mortar sprayed from the sealing insert 34 is filtered through the lower sand control pipe 26, and the gravel remains in the annulus outside the lower sand control pipe. The liquid enters through the lower sand control pipe 26, and enters the annulus between the outer punch pipe 15 and the inner punch pipe 16 through the annulus between the third outer pipe and the lower leather cup seat 23, the lower leather cup 22, and the hole on the leather cup center pipe 20, and enters the annulus between the outer punch pipe 15 and the inner punch pipe 16 through the sandwich wall cavity 10 from the connecting hole on the center pipe 5.

[0091] d. Filling the upper layer with gravel:

[0092] A third steel ball is thrown into the ball seat surface at the upper end of the sealing insert 34 to block it so that the liquid will not leak during backwashing. Then, the first steel ball is thrown into the ball seat surface of the sliding sleeve 12, and the sliding sleeve 12 is knocked off by pressure from the oil pipe to expose the filling port 1-1. At this time, the mortar is sprayed out from the filling port 1-1 of the first filling unit 1. If the casing gate is closed, the gravel is squeezed on the construction layer under high pressure. If the ground casing gate is opened, the gravel is filtered and remains outside the upper sand control pipe 17. The liquid passes through the upper sand control pipe 17 through the hole of the leather bowl center pipe 20 into the annulus between the outer flushing pipe 15 and the inner flushing pipe 16, and enters the oil casing annulus from the connecting hole on the center pipe 5 through the sandwich wall cavity 10;

[0093] e. Backwash excess gravel:

[0094] The liquid enters through the connecting hole of the central tube 5, passes through the outer wall cavity 10, the annulus between the flushing tube 15 and the inner flushing tube 16, enters the inner flushing tube 16 through the backwashing holes of the backwashing cup 24 and the cup seat 25, and returns to the ground through the oil pipe to clean up the excess gravel;

[0095] f. Well Completion:

[0096] The pipe column is rotated forward to open the reverse buckle connecting the release hand 4 and the central pipe 5, and the release hand 4, the sliding sleeve 12, the inner conversion 13, the outer conversion 14, the outer flushing pipe 15, the inner flushing pipe 16, the leather cup setting tool 21, the sealing insert 34 and the parts used for connecting them are all taken out;

[0097] At the same time, the hinge sealing plate 31 covers the central channel of the hinge plate seat 29 under the action of the spring 32, and the door closing sleeve 11 also blocks the filling port of the top filling tool 1 under the pull of the convex step at the rear of the outer conversion 14;

[0098] The part other than the hand-off 4 at the hanging packer; the first outer tube, the stopper sleeve and the door closing sleeve 11 of the first filling unit 1; the third outer tube, the upper sand control tube 17, the interlayer packer 19, and the lower sand control tube 26 of the isolation and sand control unit; the wire plug 36, the second outer tube 28 and the automatic sealing device of the second filling unit are left underground;

[0099] When the fixed pipe column described in Example 2 is used for layered extrusion and cyclic filling of the sand control pipe column, the steps are adjusted on the basis of Example 1;

[0100] a. Ground connection and entry:

[0101] b. Setting the pipe string:

[0102] c. Filling bottom gravel:

[0103] During filling, if the ground casing gate is closed, mortar enters the oil layer from the hole on the wire plug 36, and the gravel is squeezed on the construction layer with high pressure. If the casing gate is opened, the mortar sprayed from the sealing insert 34 is filtered through the lower sand control pipe 26, and the gravel remains in the annulus outside the lower sand control pipe. The liquid enters through the lower sand control pipe 26 of the top isolation and sand control unit, and enters the annulus between the outer flushing pipe 15 and the inner flushing pipe 16 through the annulus between the third outer pipe and the lower leather cup seat 23, the lower leather cup 22, and the hole on the leather cup center pipe 20, and enters the upper oil casing annulus from the connecting hole on the center pipe 5 through the sandwich wall cavity 10;

[0104] d. Filling the upper layer with gravel:

[0105] Throw the third steel ball into the ball seat surface at the upper end of the sealing insert 34 to block it, and then throw the first steel ball into the ball seat surface of the sliding sleeve 12, pressurize the oil pipe, knock out the sliding sleeve 12, and expose the filling port 1-1. At this time, mortar is sprayed out from the filling port 1-1 of the first filling unit 1. If the casing gate is closed, gravel is squeezed on the construction layer under high pressure. If the ground casing gate is opened, the gravel is filtered and remains outside the upper sand control pipe 17. The liquid passes through the upper sand control pipe 17 of the isolation and sand control unit at the top, enters the annulus between the outer flushing pipe 15 and the inner flushing pipe 16 through the hole of the leather bowl center pipe 20, and enters the upper oil casing annulus from the connecting hole on the center pipe 5 through the sandwich wall cavity 10;

[0106] After filling one layer, place appropriate steel balls and repeat the pressure filling steps until the column is filled;

[0107] e. Backwash excess gravel:

[0108] The liquid enters through the connecting hole of the central tube 5, passes through the outer wall cavity 10, the annulus between the flushing tube 15 and the inner flushing tube 16, and the backwash holes of the backwashing leather cup 24 and the leather cup seat 25, and enters the wall cavity 10 of the next first filling unit again, until the backwash hole at the bottom of the well flows into the pipe. The steel balls placed before cannot block the liquid flowing from bottom to top, and finally the liquid returns to the ground through the oil pipe to clean up the excess gravel.

[0109] f. Well completion.

[0110] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0111] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be fixedly connected, detachably connected, and integrally connected, or directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0113] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The fixed pipe column layered extrusion and circulation filling sand control pipe column includes a hanging packer arranged on the oil pipe and a sealing and sand control unit below, characterized in that: Also included is a filling unit disposed on the oil pipe; The isolation and sand control unit comprises an interlayer separator arranged on the oil pipe and an upper sand control pipe and a lower sand control pipe respectively arranged above and below the interlayer separator.

2. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 1 is characterized in that: A first filling unit is arranged between the suspension packer and the upper sand control pipe, and a second filling unit is arranged below the lower sand control pipe.

3. The fixed pipe column layered extrusion and cyclic filling sand control pipe column according to claim 2 is characterized in that: The first filling unit comprises an innermost inner conversion, the outer side of the inner conversion is connected to an outer conversion, the outer upper end of the outer conversion is connected to a first stopper sleeve, and the outer side of the first stopper sleeve is connected to a first outer tube; The inner conversion and the outer conversion are provided with filling ports separated from the annular wall cavities of the two. The filling ports only connect the inner conversion interior with the oil casing annulus. The first outer pipe is also provided with holes corresponding to the filling ports.

4. The fixed pipe column layered extrusion and cyclic filling sand control pipe column according to claim 3 is characterized in that: A sliding sleeve is arranged on the inner side of the inner conversion, and the sliding sleeve just blocks the filling port on the inner conversion. The upper end of the sliding sleeve is a ball seat surface, and a door cover is arranged below the outer filling port of the outer conversion.

5. The fixed pipe column layered extrusion and cyclic filling sand control pipe column according to claim 4 is characterized in that: The second filling unit includes a second outer tube and a wire plug arranged at the lower end of the second outer tube; It also includes an automatic sealing device arranged in the second outer tube, and the bottom of the wire plug has a hole.

6. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 5 is characterized in that: The automatic sealing device includes a hinge plate seat, a hinge sealing plate is provided at the lower end opening of the hinge plate seat, the hinge sealing plate is connected to the hinge plate seat through a hinge shaft, a spring is installed between the hinge shaft and the hinge sealing plate, a sealing insert is provided in the hinge plate seat and passes through the lower end opening of the hinge plate seat to keep the hinge sealing plate in an open state, a ball seat is provided on the inner side of the lower end opening of the sealing insert, and a ball seat surface is provided on the upper end of the sealing insert.

7. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 6 is characterized in that: The isolation and sand control unit comprises an innermost inner flushing pipe, an outer flushing pipe in the middle layer and a third outer pipe in the outermost layer, and also comprises a cup setting tool arranged on the inner side of the interlayer separator; The leather cup sealing tool includes a leather cup center tube connected to an outer punch tube, an upper leather cup and a lower leather cup are respectively provided at two ends of the outer side of the leather cup center tube, a through hole is opened in the leather cup center tube between the upper leather cup and the lower leather cup, the lower end of the outer side of the leather cup center tube is connected to a lower leather cup seat, the inner lower end of the lower leather cup seat is connected to a leather cup seat, the inner side of the upper end of the leather cup seat is connected to the inner punch tube, a backwash leather cup is provided on the outer side, and a backwash hole is provided in the middle of the leather cup seat.

8. The sand control string for layered extrusion and cyclic filling of the fixed string according to claim 7 is characterized in that: The suspension packer includes a release arm, a center pipe connected to the release arm, and a release sleeve, an upper cone, a suspension slip, a lower cone, a sealing rubber sleeve, a locking ring, a setting piston and a hydraulic cylinder sleeve arranged in sequence from the upper end to the lower end of the center pipe. The inner surface of the locking ring is provided with a one-way tooth buckle, the outer surface of the center pipe is provided with a corresponding tooth buckle, and the center pipe is provided with a connecting hole that connects the center pipe with the annulus of the oil casing.

9. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 8, characterized in that: The sliding sleeve, the inner conversion, the outer conversion and the central tube are provided with through pressure transmission holes, which transmit the pressure in the tube into the clamping wall cavity and then into the hydraulic cylinder.

10. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 9, characterized in that: The sliding sleeve is connected to the inner conversion through shear nails; the outer conversion is connected to the first stop sleeve and the door closing sleeve through shear nails; and the ball seat is connected to the sealing insert through shear nails.

11. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 10, characterized in that: The connection relationship between the suspension packer and the top first filling unit is that the release hand is connected to the inner conversion, the central tube and the hydraulic cylinder are common tubes of the suspension packer and the first filling unit, and in the first filling unit, the central tube is the first stopper sleeve and the hydraulic cylinder is the first outer tube; The connection relationship between the first filling unit and the isolation and sand control unit is that the inner conversion is connected to the inner flushing pipe, the outer conversion is connected to the outer flushing pipe, and the first outer pipe is connected to the third outer pipe; The connection relationship between the isolation and sand prevention unit and the second filling unit is that the leather cup seat is connected to the sealing insert, and the third outer tube is connected to the second outer tube.

12. The fixed pipe string layered extrusion and cyclic filling sand control pipe string according to claim 11, characterized in that: There are multiple isolation and sand control units. A first filling unit is arranged between the hanging packer and the first upper sand control pipe below it, a first filling unit is arranged between each group of lower sand control pipes and the upper sand control pipe, and a second filling unit is arranged below the lower sand control pipe at the bottom of the well.

13. The sand control string for layered extrusion and cyclic filling of the fixed string according to claim 12, characterized in that: The diameter of the steel balls allowed to pass through the ball seat surfaces in the multiple filling units decreases as the designed depth of the filling units increases.

14. The sand control string for layered extrusion and cyclic filling of the fixed string according to claim 13, characterized in that: The connection relationship between the isolation and sand control unit and the second layer first filling unit is: the inner flushing pipe is connected to the inner conversion, the leather cup seat is connected to the stopper sleeve, and the third outer tube is connected to the first outer tube; The connection relationship between the second layer first filling unit and the second layer isolation and sand control unit is that the inner conversion is connected to the inner flushing pipe, the outer conversion is connected to the outer flushing pipe, and the first outer pipe is connected to the third outer pipe; A plurality of first filling units and isolation and sand control units are repeatedly connected according to the connection relationship.

15. A method for using a fixed pipe column for layered extrusion and cyclic filling of a sand control pipe column, characterized in that the steps include: a. Ground connection and lowering steps; b. Steps for setting the pipe string; c. Step of filling bottom gravel; d. Step of filling the upper layer of gravel; e. Steps for backwashing excess gravel; f. Steps for well completion.

16. The method for using the fixed pipe column layered extrusion and cyclic filling sand control pipe column according to claim 15, characterized in that: The steps are detailed as follows: a. Ground connection and entry: Connect the pipe string as required and lower the entire pipe string into the designed position in the well; b. Setting the pipe string: Throw the second steel ball onto the ball seat, apply pressure from the wellhead, and the suspension packer is sealed; continue to apply pressure from the tubing to set the interlayer packer and complete the interlayer isolation; apply pressure from the tubing again to knock off the ball seat and open the channel for filling the bottom; c. Filling bottom gravel: Close the ground casing gate and squeeze gravel into the construction layer under high pressure. After squeezing, open the casing gate to fill the casing annulus; d. Filling the upper layer with gravel: Throw the third steel ball into the ball seat surface at the upper end of the sealing insert to block it, then throw the first steel ball into the ball seat surface of the sliding sleeve, pressurize the oil pipe to knock off the sliding sleeve and expose the filling port; Close the casing gate and squeeze gravel into the construction layer under high pressure. After squeezing, open the casing gate to fill the casing annulus. After filling one layer, if the filling is complete, proceed to the next step. If it is not complete, place another suitable steel ball and repeat the pressure filling until the column is filled. e. Backwash excess gravel: Liquid is pumped into the casing gate, and the liquid enters through the connecting hole of the central tube, enters the inner flushing pipe through the backwash hole, and returns upward to the ground to clean the excess gravel; f. Well Completion: Rotate the pipe column forward to open the reverse buckle connecting the release handle and the center pipe, disconnect all the shear nails used for connection, and lift out some parts.

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