Integrated process pipe column for subdivided series of strata sand prevention and intelligent water injection

Abstract

The invention provides a subdivided layer series sand prevention and intelligent water injection integrated process pipe column, and relates to the technical field of efficient sand prevention and water injection of oil fields, the pipe column comprises a control cable, and an upper oil pipe, a positioning seal, a through type top packer, a screen pipe, at least one group of layered operation components and a bridge plug which are arranged from top to bottom in sequence, wherein the upper oil pipe is provided with a subsurface safety valve; a positioning seal is inserted into a sealing cylinder of the through-type top packer, and the upper oil pipe is connected with a screen pipe through the positioning seal and the through-type top packer; the screen pipe comprises a sand prevention pipe column, a water injection pipe column arranged on the inner layer of the sand prevention pipe column and a cable penetrating channel for a control cable to penetrate through. And the lowest layered operation assembly is connected with the bridge plug. Layered sand prevention can be achieved, multiple injection and production scenes are considered at the same time, solutions are preset, the service life of the integrated pipe column is prolonged, and intelligent, integrated and refined regulation and control of sand prevention and injection and production are achieved.

Description

Technical Field

[0001] This invention relates to the field of efficient sand control and water injection technology in oilfields, and in particular to a process string integrating subdivided layer sand control and intelligent water injection. Background Technology

[0002] Offshore oil wells commonly face challenges such as high fluid volume, rapid water breakthrough, and formation sand production. To achieve formation sand control and balanced reservoir utilization, the industry frequently employs gravel packing sand control and injection-production technologies. Sand control completion is a crucial step in releasing the production capacity of oil and gas wells, and its sand control design methods and safe and efficient packing sand control technologies have always been internationally recognized as the primary technical challenges in offshore well completion.

[0003] Existing conventional sand control tools are all purely mechanical structures, with many operation procedures and complex structures. They cannot achieve sand control of subdivided layers, require extremely high skills from operators, and gravel filling sand control operations account for more than 50% of the total well completion operation time, resulting in low operation efficiency.

[0004] Therefore, there is an urgent need for a subdivided layered sand control and intelligent water injection integrated process tubing to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated process string for subdivided sand control and intelligent water injection, addressing the technical problems of existing conventional sand control tools being purely mechanical structures with numerous and complex procedures, unable to achieve subdivided sand control, requiring highly skilled operators, and consuming more than 50% of the total well completion time, resulting in low operational efficiency. The various technical effects of the preferred solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a subdivided layered sand control and intelligent water injection integrated process tubing, characterized in that it comprises: a control cable and, from top to bottom, an upper tubing, a positioning seal, a through-type top packer, a screen pipe, at least one set of layered operation components, and a bridge plug, wherein: The upper tubing is equipped with a downhole safety valve; The positioning seal is inserted into the sealing cylinder of the through-type top packer, and the upper oil pipe is connected to the screen pipe through the positioning seal and the through-type top packer; The screen tube includes a sand-proof pipe column, a water injection pipe column disposed in the inner layer of the sand-proof pipe column, and a cable passage channel for the control cable to pass through. The bottommost layered working component is connected to the bridge plug.

[0007] Preferably, each group of the stratified operation components includes an intelligent bypass water injection flow control valve and a through-type isolation packer, wherein: The intelligent bypass water injection flow control valve is electrically connected to the control cable; Adjacent layered work components are isolated by through-type isolation packers.

[0008] Preferably, each group of the layered operation components further includes a non-contact power transfer communication return tube, wherein: The non-contact energy transmission communication return working tube is disposed between the through-type isolation packer and the intelligent bypass water injection flow control valve. The non-contact energy transfer communication return tube is connected to the control cable for communication.

[0009] Preferably, it also includes a retrieval cableless injection and extraction tool, which includes a wireless control module and a power module electrically connected to the wireless control module, and the non-contact energy transmission communication return tube is electrically connected to the retrieval cableless injection and extraction tool.

[0010] Preferably, each group of the layered operation components further includes a shearing and segmenting recovery tool, which comprises a detachably connected upper connector and a lower connector, wherein... The upper connector is connected to the intelligent bypass water injection flow control valve in the stratified operation assembly where the shearing and segmenting recovery tool is located. The lower connector is connected to the through-type isolation packer in the layered operation assembly or to the bridge plug.

[0011] Preferably, the cutting and segmenting recycling tool further includes shear pins, wherein: The upper connector is plugged into the lower connector and fixed by the shear pin. The lower connector is equipped with a retrieval mechanism, which is used to dock with the retrieval tool after the shear pin cuts and retrieve the lower pipe column.

[0012] Preferably, the salvage tool includes a salvage spear.

[0013] Preferably, the layered operation component includes three groups, namely a first layered operation component, a second layered operation component and a third layered operation component, and the three groups of layered operation components are connected in series from top to bottom.

[0014] Preferably, the sand-proof pipe column of the screen tube has a double-layer screen tube structure, the water injection pipe column is coaxially arranged with the sand-proof pipe column, the cable crossing channel is opened in the annular area between the double-layer screen tubes, and the cable crossing channel is adapted to the outer diameter of the control cable.

[0015] Preferably, the intelligent bypass water injection flow control valve includes a main channel and a bypass guide channel connected to the main channel. The inner diameter of the main channel is the same as the inner diameter of the water injection pipe column, and the outlet of the bypass guide channel faces the sand filtering area of ​​the sand control pipe column.

[0016] The present invention provides an integrated process string for subdivided layer sand control and intelligent water injection. This string consists of an upper tubing, a positioning seal, a through-type top packer, a screen pipe, at least one set of layered operation components, and a bridge plug, arranged sequentially from top to bottom. The upper tubing is connected to the lower integrated sand control and water injection screen pipe via the positioning seal and the through-type top packer. The lowest layered operation components are connected to the bridge plug. The screen pipe includes an outer layer of sand control tubing, a water injection tubing coaxially arranged within the sand control tubing, and a cable passage for the control cable. This integrates the two existing independent screen pipes and intelligent water injection tubing currently used offshore into a single cable-passing double-layer screen pipe. This allows for one-pass sand control and water injection tubing operations. During operation, a single control cable controls the layered operation components at different downhole layers, enabling layered sand control. This addresses the need for subdivided layer sand control, while simultaneously improving operational efficiency and reducing drilling time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the integrated process tubing for subdivided layer sand control and intelligent water injection of the present invention; Figure 2 This is a schematic diagram of the integrated process tubing for sand control and intelligent water injection of the subdivided layer system according to the present invention, which injects water through an intelligent bypass water injection flow control valve; Figure 3 This is a schematic diagram of the integrated process tubing for sand control and intelligent water injection of the present invention, which connects to the working cylinder for water injection via non-contact energy transmission communication. Figure 4 This is a schematic diagram of the water injection process using a drop-and-retrieve cableless injection tool, which is part of the subdivided layer sand control and intelligent water injection integrated process tubing of the present invention.

[0019] In the diagram: 1. Top tubing; 2. Downhole safety valve; 3. Control cable; 4. Positioning seal; 5. Through-type top packer; 6. Screen pipe; 7. First non-contact power transmission and communication return tube; 8. First intelligent bypass water injection flow control valve; 9. First shearing segment recovery tool; 10. First through-type isolation packer; 11. Second non-contact power transmission and communication return tube; 12. Second intelligent bypass water injection flow control valve; 13. Second shearing segment recovery tool; 14. Second through-type isolation packer; 15. Third non-contact power transmission and communication return tube; 16. Third intelligent bypass water injection flow control valve; 17. Third shearing segment recovery tool; 18. Bridge plug; 19. Drop-and-retrieve cableless injection and production tool. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Figure 1 This is a structural schematic diagram of this embodiment, as shown below. Figure 1 As shown, this embodiment provides a subdivided layer sand control and intelligent water injection integrated process tubing, including a control cable 3 running through the entire tubing and, from top to bottom, an upper oil pipe 1, a positioning seal 4, a through-type top packer 5, a screen pipe 6, at least one set of layered operation components, and a bridge plug 18.

[0024] In this embodiment, the upper tubing 1 is equipped with a downhole safety valve 2. The downhole safety valve 2 is installed in the middle of the upper tubing 1 and is sealed to the upper tubing 1 to enable emergency shut-off of the tubing string. The upper tubing 1 is connected to the screen pipe 6 through a positioning seal 4 and a through-type top packer 5.

[0025] In this embodiment, the positioning seal 4 is a columnar sealing structure. Its upper end is threaded to the upper oil pipe 1, and its lower end is inserted into the sealing cylinder of the through-type top packer 5. Radial sealing is achieved through the elastic sealing element inside the sealing cylinder. During operation, the positioning seal 4 and the through-type top packer 5 work together to connect the upper oil pipe 1 and the lower screen pipe 6, forming a detachable sealing connection structure.

[0026] Specifically, in this embodiment, the screen pipe 6 is an integrated composite pipe body, including an outer sand-proof pipe column, a water injection pipe column coaxially disposed in the inner layer of the sand-proof pipe column, and a cable passage channel for the control cable 3 to pass through.

[0027] In this embodiment, the sand-control pipe 6 has a double-layer structure, with the water injection pipe and the sand-control pipe coaxially arranged. The cable passage is located in the annular area between the two layers, extending circumferentially along the screen pipe 6, and is adapted to the outer diameter of the control cable 3. By setting up a double-layered sand-control and water injection screen pipe 6 with cable passage function, the sand-control and water injection pipe can be lowered into the stratified water injection layer in one go.

[0028] The stratification operation component includes an intelligent control structure, which works with the control cable 3 to achieve sand control and intelligent water injection at the corresponding strata. The lowest stratification operation component is connected to the bridge plug 18, which is used to seal the bottom of the tubing string to prevent formation fluid from flowing back in.

[0029] This integrated process string for subdivided layer sand control and intelligent water injection consists of an upper tubing 1, a positioning seal 4, a through-type top packer 5, a screen pipe 6, at least one set of layered operation components, and a bridge plug 18, arranged sequentially from top to bottom. The upper tubing 1 is connected to the lower integrated sand control and water injection screen pipe 6 via the positioning seal 4 and the through-type top packer 5. The lowest layered operation components are connected to the bridge plug 18. The screen pipe 6 includes an outer sand control string, a water injection string coaxially arranged within the sand control string, and a cable passage for the control cable 3 to pass through. This integrates the two existing independent screen pipes and intelligent water injection strings currently used at sea into a single cable-passing double-layer screen pipe, enabling one-pass sand control and water injection string operations. During operation, a single control cable 3 controls the layered operation components at different layers downhole, achieving layered sand control. This solves the need for subdivided layer sand control, while improving operational efficiency and reducing drilling rig operation time.

[0030] As an optional implementation, the stratified operation component in this embodiment includes three sets. The configuration of the three sets of stratified operation components can accurately correspond to the three-layer reservoir structure commonly found in offshore oilfields, realize independent sand control and water injection regulation for reservoirs of different depths and physical properties, and meet the requirements for balanced reservoir utilization.

[0031] Of course, in actual production and use, one, two or more groups can be set up according to actual needs to adapt to the development needs of different reservoirs.

[0032] In this embodiment, the three tiered operation components are a first tiered operation component, a second tiered operation component, and a third tiered operation component, which are connected in series from top to bottom. Each tiered operation component has the same internal tools, including an intelligent bypass water injection flow control valve and a through-type isolation packer. Adjacent tiered operation components are isolated by through-type isolation packers.

[0033] Specifically, the upper end of the first layering operation component is sealed to the lower end of the screen tube 6, and its lower end is sealed to the upper end of the second layering operation component through the first through-type isolation packer 10; the lower end of the second layering operation component is sealed to the upper end of the third layering operation component through the second through-type isolation packer 14, and the lower end of the third layering operation component is sealed to the bridge plug 18.

[0034] The first layer operation component is equipped with a first intelligent bypass water injection flow control valve 8, the second layer operation component is equipped with a second intelligent bypass water injection flow control valve 12, and the third layer operation component is equipped with a third intelligent bypass water injection flow control valve 16. The first intelligent bypass water injection flow control valve 8, the second intelligent bypass water injection flow control valve 12, and the third intelligent bypass water injection flow control valve 16 are all electrically connected to the control cable 3. The intelligent bypass water injection flow control valve can be steplessly adjusted in opening and flow measured through the control cable, and meets the functions of large diameter and bypass flow guidance.

[0035] Optionally, the intelligent bypass water injection flow control valve in this embodiment includes a main channel and a bypass guide channel connected to the main channel. The inner diameter of the main channel is consistent with the inner diameter of the water injection pipe string, and the outlet of the bypass guide channel faces the sand filtering area of ​​the sand control pipe string.

[0036] During conventional stratified injection operations, the injected water passes through the screen pipe 6 and enters the formation via the bypass of the intelligent bypass water injection flow control valve of each layer. The injection volume of each layer is monitored in real time through the control cable 3, and the opening degree of the intelligent bypass water injection flow control valve is adjusted according to the needs of the reservoir.

[0037] like Figures 2-4 The diagram shown illustrates the tubing under different water injection scenarios, taking the second layer as an example. In a normal water injection scenario, as shown... Figure 2As shown, the injected water is injected into the formation through an intelligent bypass water injection flow control valve.

[0038] However, there are instances where the intelligent bypass water injection flow control valve malfunctions or reaches the end of its tool life. To address this, each stratified operating component in this embodiment also includes a non-contact power transfer and communication return tube. The non-contact power transfer and communication return tube is positioned between the through-type isolation packer and the intelligent bypass water injection flow control valve; the non-contact power transfer and communication return tube is communicatively connected to control cable 3.

[0039] like Figure 1 and Figure 3 As shown, in this embodiment, the first non-contact power transmission and communication return tube 7 is provided in the first layer operation component, the second non-contact power transmission and communication return tube 11 is provided in the second layer operation component, and the third non-contact power transmission and communication return tube 15 is provided in the third layer operation component. The first non-contact power transmission and communication return tube 7, the second non-contact power transmission and communication return tube 11, and the third non-contact power transmission and communication return tube 15 are all electrically connected to the control cable 3.

[0040] If the intelligent bypass water injection flow control valve malfunctions or reaches the end of its service life during operation, the intelligent bypass water injection flow control valve can be closed using a special tool. At the same time, the non-contact energy transmission communication return tube can be opened, and the opening degree and flow rate can be adjusted and measured through the control cable 3 non-contact energy transmission communication return tube.

[0041] However, there are situations where the control cable fails or reaches the end of its service life. To address this, this embodiment also includes a retrievable cableless injection and extraction tool 19, which includes a wireless control module and a power module electrically connected to the wireless control module. A non-contact energy transmission and communication return tube is electrically connected to the retrievable cableless injection and extraction tool 19.

[0042] When the control cable fails and cannot transmit production instructions to the non-contact energy transmission communication return tube, the cableless injection and extraction tool 19 can be lowered in. Through the wireless control of the injection and extraction tool and battery power, the non-contact energy transmission communication return tube can continue to realize intelligent water injection.

[0043] This subdivided layered sand control and intelligent water injection integrated process tubing, through the cooperation of intelligent bypass water injection flow control valve, non-contact energy transmission communication return working tube, non-contact energy transmission communication return working tube and drop-and-retrieve cableless injection and production tools, has three tiered working modes to meet the production needs of three different injection and production scenarios, improves the integrated tubing life to 10 years, ensures that the tubing does not move downhole for at least 10 years, and reduces the cost of working over the moving tubing.

[0044] As an optional implementation, each stratified operation component also includes a shearing and segmenting recovery tool. Pre-installed shearing and segmenting recovery tools provide a means to address operational risks and for subsequent well workover. In the event of a tubing failure, the sand control and water injection tubing can be quickly released at a predetermined location, while simultaneously meeting the safe retrieval requirements for rapid reconnection using conventional retrieval tools.

[0045] In this embodiment, the first layered operation component is equipped with a first shearing and segmenting recovery tool 9, the second layered operation component is equipped with a second shearing and segmenting recovery tool 13, and the third layered operation component is equipped with a third shearing and segmenting recovery tool 17. Specifically, the shearing segment recovery tool includes an upper connector, a lower connector, and shear pins. The upper connector is connected to the intelligent bypass water injection flow control valve in the stratified operation assembly where the shearing segment recovery tool is located; the lower connector is connected to the through-type isolation packer in the stratified operation assembly or to bridge plug 18. The upper and lower connectors are plugged together and connected via shear pins. The tensile strength of the shear pins is lower than the tensile strength of the screen pipe body. The lower connector has a retrieval mechanism inside, used to dock with the retrieval tool after the shear pins have sheared, to retrieve the lower part of the pipe string. The retrieval tool includes a retrieval spear.

[0046] In use, when the lower part of the shearing and segmenting tool encounters resistance, the upper screen tube is pulled up, and the shearing and segmenting tool cuts the shear pins, separating the upper and lower joints and retrieving the upper tubing string. The matching retrieval tool is then lowered and connected to the lower joint to retrieve the lower tubing string.

[0047] This integrated process tubing for layered sand control and intelligent water injection can achieve layered sand control, while considering multiple injection and production scenarios and pre-setting solutions to improve the service life of the integrated tubing. It enables intelligent, integrated, and precise control of sand control and injection and production, providing strong technical support for the construction of offshore intelligent oilfields.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A subdivided layered sand control and intelligent water injection integrated process tubing, characterized in that, include: The control cable (3) and, from top to bottom, the upper tubing (1), positioning seal (4), through top packer (5), screen pipe (6), at least one set of layered working components, and bridge plug (18), wherein: The upper tubing (1) is equipped with a downhole safety valve (2); The positioning seal (4) is inserted into the sealing cylinder of the through-type top packer (5), and the upper oil pipe (1) is connected to the screen pipe (6) through the positioning seal (4) and the through-type top packer (5). The screen tube (6) includes a sand control tube column, a water injection tube column disposed in the inner layer of the sand control tube column, and a cable passage for the control cable (3) to pass through; The bottommost layered working component is connected to the bridge plug (18).

2. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 1, characterized in that, Each of the aforementioned tiered operation components includes an intelligent bypass water injection flow control valve and a through-type isolation packer, wherein: The intelligent bypass water injection flow control valve is electrically connected to the control cable (3); Adjacent layered work components are isolated by through-type isolation packers.

3. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 2, characterized in that, Each of the layered operation components also includes a non-contact power transfer communication return tube, wherein: The non-contact energy transmission communication return working tube is disposed between the through-type isolation packer and the intelligent bypass water injection flow control valve. The non-contact energy transmission communication return working tube is connected to the control cable (3) for communication.

4. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 3, characterized in that, It also includes a cableless injection and extraction tool (19), which includes a wireless control module and a power module electrically connected to the wireless control module. The non-contact energy transmission communication return tube is electrically connected to the cableless injection and extraction tool (19).

5. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 4, characterized in that, Each of the stratified operation components further includes a shearing and segmenting recovery tool, which comprises a detachably connected upper and lower connector, wherein... The upper connector is connected to the intelligent bypass water injection flow control valve in the stratified operation assembly where the shearing and segmenting recovery tool is located. The lower connector is connected to the through-type isolation packer in the layered operation assembly or to the bridge plug (18).

6. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 5, characterized in that: The cutting and segmenting recycling tool also includes shear pins, wherein: The upper connector is plugged into the lower connector and fixed by the shear pin. The lower connector is equipped with a retrieval mechanism, which is used to dock with the retrieval tool after the shear pin cuts and retrieve the lower pipe column.

7. The integrated process tubing for subdivided layered sand control and intelligent water injection according to claim 6, characterized in that: The salvage tools include salvage spears.

8. A subdivided layered sand control and intelligent water injection integrated process tubing according to any one of claims 1-7, characterized in that: The hierarchical operation component includes three groups: a first hierarchical operation component, a second hierarchical operation component, and a third hierarchical operation component, which are connected in series from top to bottom.

9. A subdivided layered sand control and intelligent water injection integrated process tubing according to any one of claims 1-7, characterized in that: The sand-proof pipe column of the screen pipe (6) is a double-layer screen pipe structure. The water injection pipe column is coaxially arranged with the sand-proof pipe column. The cable crossing channel is opened in the annular area between the double-layer screen pipes, and the cable crossing channel is adapted to the outer diameter of the control cable (3).

10. A subdivided layered sand control and intelligent water injection integrated process tubing according to any one of claims 2-7, characterized in that: The intelligent bypass water injection flow control valve includes a main channel and a bypass guide channel connected to the main channel. The inner diameter of the main channel is the same as the inner diameter of the water injection pipe column, and the outlet of the bypass guide channel faces the sand filtering area of ​​the sand control pipe column.

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