Electro-hydraulic composite intelligent oil production string and process method

Abstract

The application provides an electro-hydraulic composite intelligent oil production pipe column and a process method. The pipe column comprises an oil cavity, an electro-hydraulic composite pressure boosting device, a setting and unsetting control device, a cable, a hydraulic control pipeline and a hydraulic control packer. When setting, the cable sends a setting signal to the setting and unsetting control device, the setting and unsetting control device is in a setting state, hydraulic oil enters the electro-hydraulic composite pressure boosting device from the oil cavity through the hydraulic control pipeline to be boosted, the hydraulic oil enters the hydraulic control packer through the hydraulic control pipeline after being boosted, and setting is completed. When unsetting, the cable sends an unsetting signal to the setting and unsetting control device, the setting and unsetting control device is in an unsetting state, the hydraulic oil returns to the oil cavity from the hydraulic control packer through the hydraulic control pipeline and the setting and unsetting control device, and unsetting is completed. The electro-hydraulic composite intelligent oil production pipe column and the process method are rapid in response, simple in structure, capable of monitoring the packer state and dynamic pressure boosting point in real time, capable of reducing the length of the hydraulic control pipeline, and capable of making up for the disadvantage of unsetting speed.

Description

Technical Field

[0001] This invention relates to the field of oilfield production tubing technology, and in particular to an electro-hydraulic composite intelligent oil production tubing and its process. Background Technology

[0002] As oilfield development enters its mid-to-late stages, inter-layer heterogeneity becomes increasingly severe, necessitating stratified extraction with real-time dynamic adjustments to further enhance oil recovery. Furthermore, with the rapid development of digitalization and intelligentization in oilfields, intelligent stratified oil production technology is an inevitable future trend. Currently, there are two main types of intelligent stratified oil production technology: cabled intelligent stratified oil production and cableless intelligent stratified oil production. Cableless intelligent stratified oil production technology transmits signals via pressure waves, but its short tubing life is limited by the battery capacity and lifespan of downhole tools. Cabled intelligent stratified oil production technology uses cables to transmit signals, which is relatively simple. However, it typically uses conventional compression packers or electric packers for stratified packing. Conventional packers require other equipment, such as tank trucks or pump trucks, for pressurization during setting. Electric packers do not require other equipment and have a fast response, but they suffer from insufficient motor drive power and small setting pressure differentials. The packers commonly used at sea are hydraulically controlled packers with hydraulic lines. Their advantages are simple structure and the ability to monitor the packer status and dynamically replenish pressure in real time. However, they need to overcome the friction of the pipeline from the well to the surface when unsealing, resulting in a slow unsealing speed.

[0003] In Chinese patent application CN201611227503.8, a smart stratified oil production tubing string for highly deviated wells and its operation method are disclosed. The stratified production tubing string includes a perforated pipe and a round plug. A cable positioning seal is provided between the perforated pipe and the round plug. Several stratified production distribution devices and at least one cable insertion seal are also provided. Each stratified production distribution device is connected to a ground controller connected to a host computer via a steel armored cable. Each stratified production distribution device corresponds to a different oil layer. The sealing between different layers is achieved through the cable positioning seal and the cable insertion seal. The operation method is as follows: (1) well cleaning; (2) after the stratified production distribution device is tested and found to be normal, the tubing string and steel armored cable are lowered; (3) tubing string sealing verification; (4) pump start-up; (5) targeted acidizing. This method enables online stepless control of stratified oil production in highly deviated wells and allows targeted acidizing to be implemented according to production requirements. This patent uses a method of sealing the tubing with a tight insert and a sealing cylinder to achieve stratified sealing. It does not have a desealing function, and the tight insert is easily scratched during tubing string operation, resulting in a reduced lifespan.

[0004] Chinese patent application CN202111425182.3 discloses a downhole integrated control intelligent stratified oil production string. This string connects several intelligent oil production devices via cables, establishing stable data communication with a downhole central controller. The central controller can make decisions based on parameters such as temperature, pressure, and flow rate provided by each intelligent oil production device, issuing commands to adjust the nozzle opening of the devices. This achieves automatic nozzle opening adjustment downhole, enabling intelligent stratified oil production with a relatively short cable length. This patent separates the pumping unit from the intelligent tubing, reducing cable length to some extent. No specific packer is specified; a conventional packer is used.

[0005] Chinese patent application CN201910044010.8 discloses a horizontal well intelligent stratified water injection and stratified oil production tubing string and process. An annular water injection gap is formed between the tubing string and the oil tubing. Inside the oil tubing, a pump, a switch for controlling the tubing's on / off state, and a bottom valve are sequentially fixed in sequence. The bottom valve is threaded to the lowest end of the oil tubing. Multiple packers and intelligent switches matching each packer are also installed on the oil tubing between the switch and the bottom valve. The switch is electrically connected to a surface controller located on the ground. A single tubing string run achieves segmented water injection and segmented oil production. The cable-controlled switch opens or closes, enabling intelligent switching between stratified water injection and stratified oil production, meeting the requirements of multi-segment injection in horizontal wells. This is of great significance for the development of ultra-low permeability tight oil. This patent is mainly applied to horizontal wells.

[0006] The above-mentioned existing technologies are all quite different from the present invention and have failed to solve the technical problem we want to solve. Therefore, we have invented a new electro-hydraulic composite intelligent oil production tubing string and process method. Summary of the Invention

[0007] The purpose of this invention is to provide an electro-hydraulic composite intelligent oil production tubing and process method that features a simple hydraulic packer structure, real-time monitoring of packer status, and dynamic pressure replenishment.

[0008] The objective of this invention can be achieved through the following technical measures: an electro-hydraulic hybrid intelligent oil production tubing string, comprising an oil chamber, an electro-hydraulic hybrid booster device, a setting / unsetting control device, a cable, a hydraulic control line, and a hydraulic control packer. The oil chamber is connected to the electro-hydraulic hybrid booster device and the setting / unsetting control device via the hydraulic control line. The hydraulic control packer is connected to the electro-hydraulic hybrid booster device and the setting / unsetting control device via the hydraulic control line. The cable is connected to the setting / unsetting control device. During setting... The cable sends a setting signal to the setting / unsetting control device. When the setting / unsetting control device is in the setting state, the hydraulic oil enters the electro-hydraulic composite pressurizing device through the hydraulic control line and the oil chamber for pressurization. After pressurization, the hydraulic oil enters the hydraulic control packer through the hydraulic control line to complete the setting. When unsetting, the cable sends a unsetting signal to the setting / unsetting control device. When the setting / unsetting control device is in the unsetting state, the hydraulic oil returns to the oil chamber from the hydraulic control packer through the hydraulic control line and the setting / unsetting control device to complete the unsetting.

[0009] The objective of this invention can also be achieved through the following technical measures:

[0010] The electro-hydraulic composite intelligent oil production tubing also includes a submersible electric pump, which is connected to the wellhead via the top of the tubing and to the oil chamber via the bottom of the tubing, to lift the produced fluid to the surface.

[0011] The electro-hydraulic composite intelligent oil production tubing also includes an electronic control switch, which is connected to the cable and connected to the hydraulic packer through the tubing. The switch is controlled by the cable to control its opening and closing degree, thereby controlling the amount of fluid produced from the oil layer.

[0012] The electronic control switch is equipped with a second pressure sensor and a flow sensor. The second pressure sensor is used to measure the oil reservoir pressure, and the flow sensor is used to measure the amount of produced fluid from the oil reservoir. The pressure and flow data are transmitted to the ground via the cable.

[0013] There are multiple hydraulic packers and multiple electrical switches, with one set for each oil layer section.

[0014] The electro-hydraulic composite intelligent oil production tubing also includes a first pressure sensor, which is located in the electro-hydraulic composite booster device. The first pressure sensor transmits a pressure signal through the cable. After the booster reaches the specified pressure, the cable transmits a booster stop signal to the electro-hydraulic composite booster device to stop boosting.

[0015] During normal production, the first pressure sensor transmits a pressure signal to the ground via the cable to monitor the setting status of the hydraulic packer. When the pressure drops to the warning value, the electro-hydraulic composite pressurization device is restarted from the ground via the cable to replenish the pressure to the specified pressure.

[0016] The objective of this invention can also be achieved through the following technical measures: a process method for an electro-hydraulic composite intelligent oil production tubing string, which employs an electro-hydraulic composite intelligent oil production tubing string and includes:

[0017] Step 1: The cable sends a setting signal to the setting / unsetting control device, and the setting / unsetting control device is in the setting state;

[0018] Step 2: The hydraulic oil enters the electro-hydraulic composite booster device through the hydraulic control line from the oil chamber for boosting. After boosting, the hydraulic oil enters the hydraulic control packer through the hydraulic control line to complete the setting seal.

[0019] Step 3: The cable sends a desealing signal to the desealing control device, and the desealing control device is in the desealing state;

[0020] Step 4: The hydraulic oil returns to the oil chamber from the hydraulically controlled packer through the hydraulically controlled pipeline and the setting and unsealing control device, completing the unsealing.

[0021] In step 2, the first pressure sensor in the electro-hydraulic composite pressurizing device transmits a pressure signal via a cable. After the pressurization reaches the specified pressure, the electro-hydraulic composite pressurizing device stops pressurizing and completes the setting seal.

[0022] The process method of the electro-hydraulic composite intelligent oil production tubing also includes, after step 4, during normal production, the first pressure sensor monitors the setting status of the hydraulic packer and transmits a pressure signal to the ground via a cable. When the pressure drops to the warning value, the electro-hydraulic composite booster device is restarted from the ground via a cable to replenish the pressure to the specified pressure.

[0023] This invention addresses the problems of conventional packers requiring auxiliary equipment for setting in intelligent stratified oil production tubing, the poor reliability of electronic components in electric packers, and the slow unsealing speed of hydraulic packers. It proposes an electro-hydraulic hybrid intelligent oil production tubing string and its associated process. The string utilizes electronic control for both input and feedback signals, resulting in fast response; and hydraulic control as the actuator, ensuring high power transfer density. It combines the rapid response of electric packers with the simple structure, real-time monitoring of packer status, and dynamic pressure replenishment of hydraulic packers, while reducing the length of the hydraulic control pipeline and compensating for the slow unsealing speed.

[0024] 1. Control is achieved through a combination of electro-hydraulic methods, with electronic control serving as both input and feedback signals, and hydraulic control as the actuator.

[0025] 2. It has advantages such as fast response, real-time monitoring of packer status, dynamic pressure replenishment, and rapid desealing. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a specific embodiment of the electro-hydraulic composite intelligent oil production tubing of the present invention. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0029] The electro-hydraulic hybrid intelligent oil production tubing of this invention mainly comprises an oil pump, an oil chamber, an electro-hydraulic hybrid booster device, a setting / unsetting control device, a cable, a hydraulic control line, a hydraulic control packer, and an electrical control switch. The cable transmits a signal from the ground, the electro-hydraulic hybrid booster device pressurizes the hydraulic oil in the oil chamber, the setting / unsetting control device is in the setting state, and the pressurized hydraulic oil enters the hydraulic control packer through the hydraulic control line, completing the setting. During unsetting, the setting / unsetting device is in the unsetting state, and the hydraulic oil returns from the packer to the oil chamber, completing the unsetting. Simultaneously, a cable controls the electrical control switch to control the oil nozzle opening and closing.

[0030] The following are several specific embodiments of the application of the present invention.

[0031] Example 1

[0032] In a specific embodiment 1 of the present invention, such as Figure 1 As shown, Figure 1 This is a schematic diagram of an electro-hydraulic hybrid intelligent oil production tubing string.

[0033] The electro-hydraulic hybrid intelligent oil production tubing of this invention mainly comprises a submersible pump (SMP), an oil chamber, an electro-hydraulic hybrid booster device (EMB), a setting / unsetting control device (SUD), a cable, a hydraulic control line, a hydraulic control packer, and an electrical control switch. The SMP, oil chamber, EMB, SUD, and electrical control switch are connected via oil pipes. The oil chamber is connected to the EMB and the setting / unsetting control device via the hydraulic control line (6). The EMB and the SUD are also connected via the hydraulic control line (6). Hydraulic oil can enter the EMB via the hydraulic control line (6) from the oil chamber (2), then enter the setting / unsetting control device (3), and finally enter the SUD via the hydraulic control line (7). Alternatively, hydraulic oil can enter the setting / unsetting control device (4) from the SUD via the hydraulic control line (7), and then enter the oil chamber (2). 5. The cable is connected from the ground to the 3 electro-hydraulic composite booster device and the 4 sealing and unsealing control device, and then downwards to the 8 electrical control switches on each floor.

[0034] Example 2

[0035] In a specific embodiment 2 of the present invention, the process method of the tubing string is as follows: During setting, cable 5 sends a signal from the ground, and the hydraulic oil in the oil chamber 2 enters the electro-hydraulic composite pressurizing device 3 and is pressurized. A pressure sensor in the electro-hydraulic composite pressurizing device 3 transmits a pressure signal via cable 5. After the pressurization reaches the specified pressure, the electro-hydraulic composite pressurizing device 3 stops pressurizing. During this period, the setting and unsetting control device 4 is in the setting state, and the hydraulic oil can only flow out of the oil chamber 2 in one direction. After pressurization, the hydraulic oil enters the hydraulically controlled packer 7 via the hydraulically controlled pipeline 6, completing the setting. During unsetting, cable 5 sends a signal from the ground, the setting and unsetting device 4 is in the unsetting state, and the hydraulic oil returns to the oil chamber 2 from the packer 7, completing the unsetting. During normal production, the packer 7 is in the setting state, and the pressure sensor in the electro-hydraulic composite pressurizing device 3 can transmit a pressure signal to the ground in real time via cable 5 to monitor the setting status of the packer 7. When the pressure drops to the warning value, the electro-hydraulic composite pressurizing device 3 can be restarted from the ground via cable 5 to replenish the pressure to the specified pressure. During production, each oil layer corresponds to an 8-electrified switch. The 8-electrified switch can be controlled from the ground via a 5-electrified cable to control its opening and closing degree. Pressure and flow sensors can also be installed in the 8-electrified switch to monitor the production status of each oil layer in real time.

[0036] The packer control described in this invention employs an electro-hydraulic hybrid approach, using electronic control as both input and feedback signals, and hydraulic control as the actuator. This combination combines the advantages of fast response from electronic control systems with the high power density and simple, reliable structure of hydraulic control systems. Compared to electronically controlled packers, it allows for real-time monitoring of the setting status and timely pressure replenishment when pressure is insufficient, ensuring normal packer setting and extending the packer's lifespan. Compared to hydraulically controlled packers, the hydraulic pipeline does not need to be connected to the ground, significantly reducing its length and minimizing pipeline friction during setting and unsetting, thus accelerating the setting and unsetting time.

[0037] Example 3:

[0038] In a specific embodiment 3 of the present invention, the present invention can also be used in rod pump wells. The electro-hydraulic composite intelligent oil production tubing mainly consists of a rod pump, an oil chamber, an electro-hydraulic composite booster device, a setting and unsealing control device, a cable, a hydraulic control pipeline, a hydraulic control packer, and an electrical control switch.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0040] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

Claims

1. An electro-hydraulic composite intelligent oil production tubing string, characterized in that, This electro-hydraulic hybrid intelligent oil production tubing includes an oil chamber, an electro-hydraulic hybrid booster device, a setting / unsetting control device, a cable, a hydraulic control line, and a hydraulic control packer. The oil chamber is connected to both the electro-hydraulic hybrid booster device and the setting / unsetting control device via the hydraulic control line. The hydraulic control packer is also connected to both the electro-hydraulic hybrid booster device and the setting / unsetting control device via the hydraulic control line. The cable is connected to the setting / unsetting control device. During setting, the cable sends a setting signal to the setting / unsetting control device. The control device, when the setting and unsetting control device is in the setting state, the hydraulic oil enters the electro-hydraulic composite pressurizing device through the hydraulic control line from the oil chamber for pressurization. After pressurization, the hydraulic oil enters the hydraulic control packer through the hydraulic control line to complete the setting. When unsetting, the cable sends a unsetting signal to the setting and unsetting control device, and the setting and unsetting control device is in the unsetting state. The hydraulic oil returns to the oil chamber from the hydraulic control packer through the hydraulic control line and the setting and unsetting control device to complete the unsetting. The electro-hydraulic composite intelligent oil production tubing also includes a submersible electric pump, which is connected to the wellhead via the top of the tubing and to the oil chamber via the bottom of the tubing, to lift the produced fluid to the surface. The electro-hydraulic composite intelligent oil production tubing also includes a first pressure sensor, which is located in the electro-hydraulic composite booster device. The first pressure sensor transmits a pressure signal through the cable. After the booster reaches the specified pressure, the cable transmits a booster stop signal to the electro-hydraulic composite booster device to stop boosting. During normal production, the first pressure sensor transmits a pressure signal to the ground via the cable to monitor the setting status of the hydraulic packer. When the pressure drops to the warning value, the electro-hydraulic composite pressurization device is restarted from the ground via the cable to replenish the pressure to the specified pressure.

2. The electro-hydraulic composite intelligent oil production tubing string according to claim 1, characterized in that, The electro-hydraulic composite intelligent oil production tubing also includes an electronic control switch, which is connected to the cable and connected to the hydraulic packer through the tubing. The switch is controlled by the cable to control its opening and closing degree, thereby controlling the amount of fluid produced from the oil layer.

3. The electro-hydraulic composite intelligent oil production tubing string according to claim 2, characterized in that, The electronic control switch is equipped with a second pressure sensor and a flow sensor. The second pressure sensor is used to measure the oil reservoir pressure, and the flow sensor is used to measure the amount of produced fluid from the oil reservoir. The pressure and flow data are transmitted to the ground via the cable.

4. The electro-hydraulic composite intelligent oil production tubing string according to claim 2, characterized in that, There are multiple hydraulic packers and multiple electrical switches, with one set for each oil layer segment.

5. A technological method for an electro-hydraulic hybrid intelligent oil production tubing string, characterized in that, The process method for this electro-hydraulic hybrid intelligent oil production tubing uses the electro-hydraulic hybrid intelligent oil production tubing described in claim 1, including: Step 1: The cable sends a setting signal to the setting / unsetting control device, and the setting / unsetting control device is in the setting state; Step 2: The hydraulic oil enters the electro-hydraulic composite booster device through the hydraulic control line from the oil chamber for boosting. After boosting, the hydraulic oil enters the hydraulic control packer through the hydraulic control line to complete the setting seal. Step 3: The cable sends a desealing signal to the desealing control device, and the desealing control device is in the desealing state; Step 4: The hydraulic oil returns to the oil chamber from the hydraulically controlled packer through the hydraulically controlled pipeline and the setting and unsealing control device, completing the unsealing.

6. The process method for the electro-hydraulic composite intelligent oil production tubing string according to claim 5, characterized in that, In step 2, the first pressure sensor in the electro-hydraulic composite pressurizing device transmits a pressure signal via a cable. After the pressurization reaches the specified pressure, the electro-hydraulic composite pressurizing device stops pressurizing and completes the setting seal.

7. The process method for the electro-hydraulic composite intelligent oil production tubing string according to claim 5, characterized in that, The process method of the electro-hydraulic composite intelligent oil production tubing also includes, after step 4, during normal production, the first pressure sensor monitors the setting status of the hydraulic packer and transmits a pressure signal to the ground via a cable. When the pressure drops to the warning value, the electro-hydraulic composite booster device is restarted from the ground via a cable to replenish the pressure to the specified pressure.

Images