Deep sea throwing and fishing type intelligent well completion system and method and throwing and fishing method

Abstract

The invention belongs to the technical field of oil and gas well oil extraction and well completion, and provides a deep sea throwing-fishing type intelligent well completion system and method and a throwing-fishing method.The system comprises an above-well unit used for sending a control instruction to an underground unit and receiving data collected by the underground unit; the underground unit comprises an injection pipeline and a control cable; wherein the injection pipeline is matched and connected with a plurality of underground injection valves, and the control cable is matched and connected with a plurality of interlayer control valves. According to the invention, a single cable can operate a plurality of interlayer control valves underground and collect and process underground parameters, the integration degree is high, and the number of pipelines is small. When the underground flow control valve has an accident (such as scaling failure and the like), the dropping and fishing operation of the interlayer control valve can be realized without a drilling machine / operation machine, so that the construction risk and the expensive offshore operation cost are reduced, and the application prospect is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas well production and completion, and in particular relates to a deep-sea dredging and fishing type intelligent well completion system, method and dredging method. Background Art

[0002] At present, deep-sea intelligent completion systems often use hydraulically controlled intelligent completion methods. At present, all intelligent completion systems on the market are hydraulically driven intelligent completion systems. The hydraulically controlled intelligent completion system mainly includes a surface system, a hydraulic layer control valve, a through-type packer, a downhole flow control valve (interlayer control valve), etc. Each interlayer control valve is controlled on / off by two hydraulic control pipelines. There are many downhole control pipelines in the hydraulically controlled intelligent completion system. For example, 6 hydraulic control pipelines need to be installed for 5 layers; and the interlayer control valve has a long layer change operation time, and the single layer adjustment time is not less than 5h; for highly mineralized carbonate reservoirs, oil well scaling often leads to the failure of interlayer control valve operation. The interlayer control valve operation requires the lifting and lowering of the entire completion string and the use of drilling / repairing rigs. The cost of offshore operations is high, as described in the article "Analysis of Open Hole Intelligent Completion Technology in Brazil's Subsalt Carbonate Reservoirs". Similarly, the pure electric control / electro-hydraulic group control intelligent completion system is also connected to the wellhead through the completion string. If the downhole interlayer control valve fails, a driller operation is also required, and the operation cost is high, such as described in the patent - Downhole Electro-hydraulic Group Control Intelligent Completion System (Patent No.: CN212867514U). Summary of the invention

[0003] In order to solve at least one problem in the background technology, the present invention provides a deep-sea dredging and fishing type intelligent well completion system, method and dredging method.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A deep-sea dredging and scavenging intelligent well completion system, comprising:

[0006] The uphole unit is used to send control instructions to the downhole unit and receive data collected by the downhole unit;

[0007] The downhole unit includes an injection pipeline and a control cable;

[0008] The injection pipeline is connected with a plurality of downhole injection valves;

[0009] The control cable is connected with a plurality of interlayer control valves.

[0010] Preferably, the downhole unit further comprises an outer production casing and an inner production casing;

[0011] The inner production casing is located inside the outer production casing and is coaxially arranged;

[0012] An upper tubular column layer and n oil layers are sequentially arranged along the axial direction of the outer production casing, the upper tubular column layer and the oil layer are separated by a penetration packer, n is greater than 1, and the penetration packer is installed in the annulus of the outer production casing and the inner production casing;

[0013] Preferably, there are n+1 downhole injection valves, all of which are installed on the inner production casing and are respectively located in the n oil layers and the upper tubular layer of the inner production casing.

[0014] Preferably, there are n interlayer control valves, which are respectively installed on the inner production casings of n oil layers.

[0015] Preferably, a downhole safety valve is also installed in the upper tubular layer of the inner production casing, and the downhole safety valve is connected to a hydraulic control pipeline, and the hydraulic control pipeline is used to control the on and off of the downhole safety valve.

[0016] Preferably, one end of the inner production casing is connected to the ground, and the other end is provided with a round-head guide shoe.

[0017] Preferably, the uphole unit comprises:

[0018] Wellhead Christmas tree, installed on the ground;

[0019] A dosing tank connected to the injection pipeline and used to inject chemical agents into the injection pipeline;

[0020] A ground control cabinet, connected to the control cable, for sending and receiving control signals to the control cable;

[0021] The ground data processing module is connected to the ground control cabinet and is used to obtain and analyze the information collected by the interlayer control valve and send a control signal to the ground control cabinet according to the information collected by the interlayer control valve.

[0022] Preferably, the interlayer control valve comprises a working cylinder and a production distribution valve core, the production distribution valve core is installed in the working cylinder, and the working cylinder is connected to the inner production casing;

[0023] The production distribution valve core includes a monitoring module, a production distribution device, a control module and a docking module;

[0024] The monitoring module is connected to the production distributor and is used to monitor the temperature and pressure parameters of the formation;

[0025] The production distributor is connected to the control module and is used to adjust the liquid production;

[0026] The control module is connected to the docking module and is used to analyze the control signal transmitted by the uphole unit;

[0027] The docking module portion is used for wet connection with the control cable.

[0028] A deep-sea intelligent well completion method that can be cast and retrieved is used for the above-mentioned deep-sea intelligent well completion system, comprising the following steps:

[0029] Set n oil layers in the downhole unit, n>1;

[0030] The control information is sent through the uphole unit to open the i-th oil layer, so that the oil reservoir enters the interlayer control valve of the i-th layer;

[0031] The reservoir information is collected through the interlayer control valve of the i-th layer and fed back to the uphole unit;

[0032] At the same time, chemicals are injected into the downhole injection valve through the injection pipeline.

[0033] Preferably, after the control information is sent through the uphole unit, the m-layer oil layer can also be opened to allow the oil reservoir to enter the interlayer control valve of the m-layer;

[0034] Then, reservoir information is collected through the interlayer control valves of the m layers and fed back to the uphole unit, n≥m>1.

[0035] A casting and catching method, used for the above-mentioned deep-sea casting and catching type intelligent well completion system, comprising:

[0036] When the interlayer control valve of the i-th layer of the downhole unit is damaged, a salvage tool is lowered by a wire rope to salvage the interlayer control valve of the i-th layer.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention uses an injection pipeline to match a downhole injection valve. In the working state, chemical agents can be injected into the downhole injection valve through the injection pipeline, thereby preventing scaling of the inner production casing and the interlayer control valve, which is beneficial to prolonging their service life;

[0039] 2. The present invention uses a single control cable to connect the interlayer control valve. In the working state, one or more interlayer control valves can be opened or closed at the same time, so that crude oil can enter the inner production casing from the oil reservoir. At the same time, the interlayer control valve can collect specific parameter information (temperature, pressure, etc.) of each oil layer and feed it back to the wellhead unit through the control cable;

[0040] 3. The present invention can meet the requirements of a single cable for the operation of multiple interlayer control valves in the well and the collection and processing of downhole parameters, with a high degree of integration and a small number of pipelines. When an accident occurs to the downhole flow control valve (such as scaling failure, etc.), there is no need for a drilling rig / operating machine to implement the salvage operation of the interlayer control valve, which reduces construction risks and expensive offshore operating costs, and has broad application prospects.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A structural schematic diagram of a deep-sea dredgeable intelligent well completion system of the present invention is shown;

[0044] Figure 2 A schematic structural diagram of the interlayer control valve of the present invention is shown;

[0045] Figure 3 A schematic diagram of the casting and catching process of the present invention is shown.

[0046] In the figure: 1. hydraulic control pipeline; 2. external production casing; 3. injection pipeline; 4. internal production casing; 5. downhole safety valve; 6. downhole injection valve; 7. through-packer; 8. interlayer control valve; 9. control cable; 10. round-head guide shoe; 11. wellhead Christmas tree; 12. dosing tank; 13. ground control cabinet; 14. ground data processing module. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0048] A deep-sea retrievable intelligent well completion system, such as Figure 1 As shown, it includes an uphole unit and a downhole unit. The uphole unit is used to receive the working data of the downhole unit and send control instructions according to the working data; the downhole unit includes an outer production casing 2, an injection pipeline 3, an inner production casing 4 and a control cable 9. The inner production casing 4 is located inside the outer production casing 2 and is coaxially arranged; and an upper pipe string layer and n oil layers ( Figure 1In the figure, n=3), the upper tubular layer and the oil layer are separated by a through packer 7, and the through packer 7 is installed in the annulus of the outer production casing 2 and the inner production casing 4. In addition, there are (n+1) downhole injection valves 6 corresponding to the number of layers, one is installed in the upper part of the inner production tubular (upper tubular layer), and the rest are installed in the n oil layers of the lower tubular (inner production tubular); at the same time, there are n interlayer control valves (ICV) 8, which are respectively installed on the inner production casing 4 of each oil layer in the well; at the same time, a downhole safety valve 5 is also installed in the upper tubular layer of the inner production casing 4, and the downhole safety valve 5 is connected to a hydraulic control pipeline 1, which is used to control the on and off of the downhole safety valve 5.

[0049] Further, from Figure 1 It can be seen that the injection pipeline 3 and the control cable 9 are both located in the annulus of the outer production casing 2 and the inner production casing 4. The injection pipeline 3 is connected to the downhole injection valve 6 respectively; similarly, the n interlayer control valves 8 are also connected to the control cable 9 respectively.

[0050] Furthermore, one end of the inner production casing 4 is connected to the ground, and the other end is provided with a round-head guide shoe 10 to guide the safe lowering of the pipe string and prevent the end from bumping.

[0051] Further, from Figure 1 It can be seen that the uphole unit includes a wellhead Christmas tree 11, a dosing tank 12, a ground control cabinet 13 and a ground data processing module 14. Among them, the wellhead Christmas tree 11 is installed on the ground, and its flange has pipeline crossing and sealing functions to ensure the crossing of downhole cables and injection pipelines. The dosing tank 12 is connected to the injection pipeline 3, which is used to inject chemical agents into the injection pipeline 3 to delay the scaling of the oil well; the ground control cabinet 13 is connected to the control cable 9, which is used to send and receive control signals to the control cable 9; the ground data processing module 14 is connected to the ground control cabinet 13, automatically obtains and analyzes the information collected by the interlayer control valve 8, and sends control signals to the ground control cabinet 13 according to the information collected by the interlayer control valve 8.

[0052] It should be noted that the opening / closing operation of the interlayer control valve 8 of each layer is controlled by the control cable 9 installed underground. The system realizes the control of multiple interlayer control valves 8 with only one cable. When a layer underground needs to be closed / opened, the engineer sends an instruction through the ground data processing module 14 and transmits it to the ground control cabinet 13, and then the ground control cabinet 13 transmits the signal to the interlayer control valve 8 underground through the control cable to control the opening / closing action of the interlayer control valve 8. Similarly, the underground parameter data such as temperature, pressure, flow rate, etc. of each layer can also be transmitted to the ground through the cable 9, and analyzed and processed by the ground engineer.

[0053] Furthermore, if Figure 2As shown, the interlayer control valve 8 is mainly composed of four parts, A, B, C and D, including a working cylinder and a production distribution valve core, wherein the production distribution valve core is installed in the working cylinder, and the working cylinder is connected to the inner production casing 4. The production distribution valve core includes a monitoring module, a production distribution device, a control module and a docking module; wherein the monitoring module is connected to the production distribution device, and has a built-in temperature and pressure sensor, which is responsible for monitoring the temperature, pressure and other parameters of the formation; the production distribution device is connected to the control module, which is used to adjust the liquid production of each layer by adjusting the size of the water nozzle; the control module is connected to the docking module, and has a built-in control circuit board and a motor, which analyzes the control signal transmitted from the uphole unit to make the motor adjust the production distribution of B, and collect and send the data of A at the same time; the docking module is used to ensure the wet connection between the production distribution valve core and the external control cable 9.

[0054] A deep-sea intelligent well completion method that can be cast and retrieved is used for the above-mentioned deep-sea intelligent well completion system, comprising the following steps:

[0055] S1: Set n oil layers in the downhole unit, n>1; S2: Send control information through the uphole unit to open the i-th oil layer, so that the oil reservoir enters the interlayer control valve 8 of the i-th layer; S3: Collect reservoir information through the interlayer control valve 8 of the i-th layer, and feed it back to the uphole unit; at the same time, inject chemical agents into the downhole injection valve 6 through the injection pipeline 3.

[0056] It should be noted that the downhole safety valve 5 is in an open state during the normal production stage of the oil well, and can only be controlled to close by the hydraulic control pipeline 1 when a blowout or other accident danger occurs. In addition, in step S2, a control signal can be sent from the uphole unit to the m-layer downhole unit to open or close the interlayer control valve, and reservoir information can be collected through the interlayer control valve 8 of the m-layer and fed back to the uphole unit, n≥m>1. In addition, after the reservoir information is fed back to the uphole unit in step S3, the uphole unit can continue to send control signals according to the feedback information to adjust the operating parameters of the interlayer control valve 8.

[0057] A method of casting and fishing, such as Figure 3 As shown, a deep-sea retrievable intelligent well completion system for the above-mentioned well includes:

[0058] When the interlayer control valve 8 of the i-th layer of the downhole unit is damaged, a salvage tool is lowered by a wire rope to salvage the interlayer control valve 8 of the i-th layer.

[0059] It should be noted that the advantage of this salvage method is that the replacement of the production distribution valve core can be achieved through wire operation, which greatly reduces the operation time and construction risk. For example, when the interlayer control valve 8 of a certain layer fails (caused by scaling, etc.), the production distribution valve core of that layer can be salvaged and replaced by lowering a dedicated salvage tool through a wire rope. If the production distribution valve core of layer i needs to be salvaged due to a failure, it is necessary to lower a wire rope to salvage the production distribution valve cores of all interlayer control valves 8 above that layer layer by layer, and then salvage and replace the production distribution valve core of that layer.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deep-sea dredging intelligent well completion system, characterized in that: include: The uphole unit is used to send control instructions to the downhole unit and receive data collected by the downhole unit; The downhole unit comprises an injection pipeline (3) and a control cable (9); The injection pipeline (3) is connected with a plurality of downhole injection valves (6); The control cable (9) is connected to a plurality of interlayer control valves (8).

2. A deep-sea dredgeable intelligent well completion system according to claim 1, characterized in that: The downhole unit further comprises an outer production casing (2) and an inner production casing (4); The inner production casing (4) is located inside the outer production casing (2) and is coaxially arranged; An upper tubular column layer and n oil layers are sequentially arranged along the axial direction of the outer production casing (2), and the upper tubular column layer and the oil layers are separated by a through packer (7), n is greater than 1, and the through packer (7) is installed in the annulus between the outer production casing (2) and the inner production casing (4).

3. A deep-sea salvageable intelligent well completion system according to claim 2, characterized in that: The downhole injection valves (6) are provided in n+1 numbers, all of which are installed on the inner production casing (4) and are respectively located in the n oil layers and the upper tubular column layer of the inner production casing (4).

4. A deep-sea dredgable intelligent well completion system according to claim 3, characterized in that: The interlayer control valves (8) are provided in n numbers and are respectively installed on the inner production pipe sleeves (4) of the n oil layers.

5. The deep-sea dredgable intelligent well completion system according to claim 2, characterized in that: A downhole safety valve (5) is also installed in the upper tubular layer of the inner production casing (4), and the downhole safety valve (5) is connected to a hydraulic control pipeline (1), and the hydraulic control pipeline (1) is used to control the opening and closing of the downhole safety valve (5).

6. A deep-sea retrievable intelligent well completion system according to any one of claims 2 to 5, characterized in that: One end of the inner production casing (4) is connected to the ground, and the other end is provided with a round-head guide shoe (10).

7. The deep-sea dredgable intelligent well completion system according to claim 1, characterized in that: The wellhead unit includes: A wellhead Christmas tree (11), installed on the ground; A chemical dosing tank (12) connected to the injection pipeline (3) and used to inject chemical agents into the injection pipeline (3); A ground control cabinet (13) connected to the control cable (9) for sending and receiving control signals to the control cable (9); The ground data processing module (14) is connected to the ground control cabinet (13) and is used to obtain and analyze the information collected by the interlayer control valve (8), and send a control signal to the ground control cabinet (13) according to the information collected by the interlayer control valve (8).

8. The deep-sea dredgable intelligent well completion system according to claim 2, characterized in that: The interlayer control valve (8) comprises a working cylinder and a production allocation valve core, wherein the production allocation valve core is installed in the working cylinder, and the working cylinder is connected to the inner production casing (4); The production distribution valve core includes a monitoring module, a production distribution device, a control module and a docking module; The monitoring module is connected to the production distributor and is used to monitor the temperature and pressure parameters of the formation; The production distributor is connected to the control module and is used to adjust the liquid production; The control module is connected to the docking module and is used to analyze the control signal transmitted by the uphole unit; The docking module part is used for wet connection with the control cable (9).

9. A deep-sea intelligent well completion method, used in a deep-sea intelligent well completion system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Set n oil layers in the downhole unit, n>1; Sending control information through the uphole unit to open the i-th oil layer and allow the oil reservoir to enter the i-th layer interlayer control valve (8); The reservoir information is collected through the interlayer control valve (8) of the i-th layer and fed back to the uphole unit; At the same time, chemical agents are injected into the downhole injection valve (6) through the injection pipeline (3).

10. A deep-sea dredgable intelligent well completion method according to claim 9, characterized in that: When the control information is sent through the uphole unit, the m-layer oil layer can also be opened to allow the oil reservoir to enter the interlayer control valve (8) of the m-layer; Then, reservoir information is collected through the interlayer control valve (8) of the m layers and fed back to the uphole unit, n≥m>1.

11. A method for casting and fishing, used in a deep-sea casting and fishing intelligent completion system according to any one of claims 1 to 8, characterized in that: include: When the interlayer control valve (8) of the i-th layer of the downhole unit is damaged, a salvage tool is lowered by means of a wire rope to salvage the interlayer control valve (8) of the i-th layer.

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