CN113605860B - A remote control toe end sliding sleeve opening system based on pressure pulse signal - Google Patents

Abstract

The invention relates to a remote control toe end sliding sleeve opening system based on a pressure pulse signal, which comprises a pressure transmitter, a high-temperature high-pressure electromagnetic valve, a microprocessor, an NPN triode and a high-temperature battery pack, wherein the two NPN triodes are controlled by an STM32 singlechip, a timer is arranged in the NPN triode, and the triggering time of the pressure transmitter and the high-temperature high-pressure electromagnetic valve is regulated. The NPN triode is used for controlling the time of the pressure transmitter for detecting the fluid pressure in a timing mode, and the high-temperature high-pressure electromagnetic valve is opened after receiving the pressure pulse signal on the well, so that the sliding sleeve is opened. The opening time of the toe end sliding sleeve is controlled, and meanwhile, the toe end sliding sleeve is not influenced by pressure in the pipe. The problems that the existing toe end sliding sleeve explosion valve cannot realize automatic control and is low in delay opening success rate are solved, the automatic control of the opening function of the sliding sleeve on the well is realized, the pressure test time and times of the shaft are not limited, and the operability and compatibility of the system are improved.

Description

A remote control toe end sliding sleeve opening system based on pressure pulse signal

technical field

The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a remote control toe end sliding sleeve opening system based on a pressure pulse signal.

Background technique

At present, the key technology in the development of shale oil and gas and other tight oil and gas resources is bridge plug multi-stage fracturing technology. However, this technology mainly relies on coiled tubing to perforate the first layer. For horizontal wells with long horizontal sections, the production layer in the first section is abandoned because the coiled tubing cannot be drilled to the bottom of the well. This method is time-consuming and labor-intensive and increases operating costs and risks. With the appearance and application of toe-end sliding sleeves, the shortcomings of bridge plug multi-stage fracturing technology have been improved. The sliding sleeve at the toe of the casing follows the production casing into the well and is cemented as the first-stage fracturing sliding sleeve. The sliding sleeve cooperates with other staged reconstruction tools, which is not limited by the working length of the coiled tubing, and can extend the fracturing depth of the horizontal section.

Patent CN205189848U discloses the cementing and fracturing sliding sleeve at the toe end of the rupture disc. The opening piston of the sliding sleeve is driven by pressure, and a rupture disc is installed in the pressure transmission path. According to the well conditions, the corresponding rupture value of the rupture disc is designed to ensure In the pressure range, the rupture disk can be opened, and the pressure drives the piston of the sliding sleeve to move, so as to achieve the purpose of opening the sliding sleeve.

However, in field applications, the opening success rate of the sliding sleeve at the toe end of the casing based on the pressure difference shear pin or the absolute pressure pressure bursting burst valve is extremely low. The reason is that the wellbore and wellhead need to be pressure tested before the oil field is exploited. The pressure must not only ensure that the wellbore and wellhead pressure test is qualified, but also ensure that the toe-end sliding sleeve is not opened. This often designs the opening pressure of the toe-end sliding sleeve in the wellbore and wellhead When the sliding sleeve at the toe end is opened, its cracking pressure has exceeded the standard pressure test pressure of wellbore and wellhead pressure test operations. In addition, when the casing toe end sliding sleeve of the blasting valve structure is buried by cement or the structure is damaged, the sliding sleeve will not open normally.

Patent CN207048726U discloses the electrical control system of the intelligent sliding sleeve at the toe end. Sensors detect pressure changes in the casing, thereby opening the sleeve by detonating the shaped charge. The above technology uses a pressure sensor to measure the pressure value, and the microprocessor receives the pressure value signal to control the detonation circuit to open the sliding sleeve, which avoids the conflict between the pressure driving the sliding sleeve and the pressure test pressure of the wellbore and wellhead. However, the operation of the pressure sensor and the detonation circuit will consume a large amount of electric energy, and the space in the shaft does not allow a large battery to be placed, so this limits the running time of the entire system, and the instability of the detonation circuit affects the opening accuracy of the sliding sleeve.

Contents of the invention

In order to solve the problem of using the blasting valve to drive the sliding sleeve in the prior art, the difference between the pressure test pressure value of the wellbore and the wellhead and the opening pressure value of the blasting valve is too small, so that the blasting valve is accidentally opened during the pressure test process, resulting in a low normal opening rate of the sliding sleeve problem, the purpose of the present invention is to provide a remote control toe end sliding sleeve opening system based on pressure pulse signals, which can control the opening of the sliding sleeve in the form of pressure waves on the ground for an unlimited time, and can automatically set the number of pressure tests, thereby Improve the reliability, compatibility and operability of sliding sleeves.

The technical solution adopted by the present invention to solve the technical problem is: a remote control toe end sliding sleeve opening system based on pressure pulse signal, including pressure transmitter, high temperature and high pressure solenoid valve, microprocessor, NPN three-stage tube, high temperature The battery pack, the high temperature and high pressure solenoid valve, microprocessor, NPN triode and high temperature battery pack are installed in the tank on the casing of the sliding sleeve, a T-shaped pipe is drawn from the main pipe of the sliding sleeve, one side is connected to the pressure transmitter, and the other One side is connected to the high-temperature and high-pressure solenoid valve. There is an inner piston behind the high-temperature and high-pressure solenoid valve. The sensing end of the pressure transmitter is in contact with the liquid in the wellbore. The lead end of the pressure transmitter is connected to the microprocessor. There are two NPN triodes, one NPN triode is connected to the high temperature and high pressure solenoid valve, which is used to control the opening of the high temperature and high pressure solenoid valve to control the flow of liquid. After the liquid circulates, it can push the inner piston to move, and the other NPN triode is connected to the pressure transmitter. There are two sets of high-temperature battery packs, one set of high-temperature battery packs is connected to the microprocessor for powering the microprocessor, and the other set of high-temperature battery packs is connected to two NPN transistors for powering the pressure transmitter and high-temperature and high-voltage electromagnetic Valve power supply.

Further, the microprocessor adopts the STM32L4 series single-chip microcomputer, and the STM32L4 series single-chip microcomputer and the NPN triode are integrated welded by soldering technology, and the I/O port of the STM32L4 series single-chip microcomputer is connected to the bases of the two NPN triodes to control the connection between the emitter and the collector. conduction.

Further, the STM32L4 series single-chip microcomputer internally sets a timer for specifying the trigger time of the pressure transmitter.

Further, the pressure transmitter is provided with a thread and a sealing ring for sealing isolation.

Further, the pressure transmitter adopts HM28 sapphire pressure transmitter.

Further, the two sets of high-temperature battery packs are ring-shaped around the casing of the sliding sleeve, the voltage of the high-temperature battery pack for the microprocessor is 3.6V, and the high-temperature battery pack for the power supply of the pressure transmitter and the high-temperature and high-pressure solenoid valve The voltage is 24V.

The working steps of the remote control toe end sliding sleeve opening system based on the pressure pulse signal are as follows:

1) The microprocessor starts and starts counting down;

2) After the specified time is reached, the microprocessor sends out a control command, and the base of the NPN transistor connected to the pressure transmitter is energized;

3) The collector and emitter of the NPN triode connected to the pressure transmitter are turned on, and the pressure transmitter starts to work;

4) The ground sends a specific pressure pulse signal downhole;

5) The pressure transmitter transmits the real-time signal to the microprocessor, and the microprocessor decodes the digital signal transmitted by the pressure transmitter, and obtains the control command according to the compiler program, and the base of the NPN transistor connected to the high-temperature and high-pressure solenoid valve is energized;

6) The collector and emitter of the NPN triode connected to the high-temperature and high-pressure solenoid valve are turned on, the high-temperature and high-pressure solenoid valve is opened, and the liquid in the pipe circulates;

7) The liquid in the tube pushes the inner piston to move, and the sliding sleeve at the toe end opens.

The present invention has the following beneficial effects:

(1) The present invention solves the problem that the existing toe-end sliding sleeve blasting valve cannot realize automatic control and the success rate of delayed opening is low, and realizes the automatic control of the opening function of the sliding sleeve in the well, and the wellbore pressure test time and times are not limited. Restricted, improve the operability and compatibility of the system.

(2) The present invention controls two NPN triodes through the STM32 single-chip microcomputer, and sets a timer inside to specify the triggering time of the pressure transmitter and the high-temperature and high-pressure solenoid valve. The NPN triode is used to regularly control the detection fluid pressure time of the pressure transmitter. After receiving the pressure pulse signal from the well, the high temperature and high pressure solenoid valve is opened to realize the opening of the sliding sleeve. Compared with other electronically controlled sliding sleeves, this method solves the problem of excessive power consumption, realizes the control of the opening time of the toe end sliding sleeve, and is not affected by the pressure inside the pipe.

Description of drawings

Fig. 1 is a schematic diagram of the control structure of the remote control toe end sliding sleeve opening system of the present invention.

Detailed ways

The following are specific examples of the present invention, further describing the technical solutions of the present invention, but the protection scope of the present invention is not limited to these examples. All changes or equivalent substitutions that do not depart from the concept of the present invention are included in the protection scope of the present invention.

A remote control toe end sliding sleeve opening system based on a pressure pulse signal, including a pressure transmitter, a high temperature and high pressure solenoid valve, a microprocessor, an NPN three-stage tube, a high temperature battery pack, the high temperature and high pressure solenoid valve, a microprocessor , NPN triode and high-temperature battery pack are installed in the tank on the casing of the sliding sleeve, a T-shaped pipe is drawn from the main pipe of the sliding sleeve, one side is connected to the pressure transmitter, the other side is connected to the high-temperature and high-pressure solenoid valve, and the high-temperature and high-pressure solenoid valve There is an inner piston at the rear.

As shown in Figure 1, the sensing end of the pressure transmitter is in contact with the liquid in the wellbore, the lead end of the pressure transmitter is connected to the microprocessor, the microprocessor is connected to two NPN transistors, and one NPN transistor is connected to the high temperature and high pressure electromagnetic The valve connection is used to control the opening of the high-temperature and high-pressure solenoid valve to control the flow of liquid. After the flow of liquid, it can push the inner piston to move. The other NPN triode is connected to the pressure transmitter. There are two sets of high-temperature battery packs, one set of high-temperature battery packs and The microprocessor is connected to supply power to the microprocessor, and another high-temperature battery pack is connected to two NPN triodes to supply power to the pressure transmitter and the high-temperature and high-pressure solenoid valve.

The microprocessor adopts the STM32L4 series single-chip microcomputer, and the STM32L4 series single-chip microcomputer and the NPN triode are welded by soldering technology.

The remote control toe end sliding sleeve opening system based on the pressure pulse signal includes a transmitter control circuit and a solenoid valve control circuit.

The transmitter control circuit takes the STM32L4 series microcontroller as the core, the pressure transmitter as the control object, and the NPN transistor connected to the pressure transmitter as the actuator. The STM32L4 series single-chip microcomputer sets a timer inside to specify the trigger time of the pressure transmitter. When the countdown in the timer is zero, the STM32 triggers the transmitter control circuit, and uses the NPN transistor to control the pressure transmitter to be powered on.

The solenoid valve control circuit takes the STM32L4 series single-chip microcomputer as the core, the high-temperature and high-pressure solenoid valve is the control object, and the NPN transistor connected to the high-temperature and high-pressure solenoid valve is the actuator. The pressure transmitter detects the pressure value in the pipeline in real time, and converts it into a digital signal through the AD module and inputs it into the STM32L4 series microcontroller. After receiving the pressure pulse signal, the STM32L4 series single-chip microcomputer triggers the solenoid valve control circuit, uses the NPN transistor to control the high-temperature and high-pressure solenoid valve to open, and the liquid in the tube circulates to open the toe end sliding sleeve.

The pressure transmitter adopts HM28 sapphire pressure transmitter, and the pressure transmitter is provided with threads and sealing rings for sealing isolation.

Two sets of high-temperature battery packs surround the sliding sleeve casing in a ring shape. The voltage of the high-temperature battery pack for powering the microprocessor is 3.6V, and the voltage of the high-temperature battery pack for powering the pressure transmitter and high-temperature and high-pressure solenoid valve is 24V.

The working steps of the remote control toe end sliding sleeve opening system based on the pressure pulse signal are as follows:

1) The microprocessor starts and starts counting down;

2) After the specified time is reached, the microprocessor sends out a control command, and the base of the NPN transistor connected to the pressure transmitter is energized;

3) The collector and emitter of the NPN triode connected to the pressure transmitter are turned on, and the pressure transmitter starts to work;

4) The ground sends a specific pressure pulse signal downhole;

5) The pressure transmitter transmits the real-time signal to the microprocessor, and the microprocessor decodes the digital signal transmitted by the pressure transmitter, and obtains the control command according to the compiler program, and the base of the NPN transistor connected to the high-temperature and high-pressure solenoid valve is energized;

6) The collector and emitter of the NPN triode connected to the high-temperature and high-pressure solenoid valve are turned on, the high-temperature and high-pressure solenoid valve is opened, and the liquid in the pipe circulates;

7) The liquid in the tube pushes the inner piston to move, and the sliding sleeve at the toe end opens.

The present invention is not limited to the above-mentioned embodiments, and anyone should know that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same as or similar to the present invention, all fall within the protection scope of the present invention.

The technologies, shapes and construction parts not described in detail in the present invention are all known technologies.

Claims (7)

1. The high-temperature high-pressure electromagnetic valve, the microprocessor, the NPN triode and the high-temperature battery pack are installed in a groove body on a sliding sleeve shell, a T-shaped pipeline is led out from a main pipeline of the sliding sleeve, one side of the T-shaped pipeline is connected with the pressure transmitter, the other side of the T-shaped pipeline is connected with the high-temperature high-pressure electromagnetic valve, an inner piston is arranged behind the high-temperature high-pressure electromagnetic valve, the sensing end of the pressure transmitter is in contact with liquid in a shaft, the lead end of the pressure transmitter is connected with the microprocessor, the microprocessor is connected with the two NPN triodes, the NPN triode is connected with the high-temperature high-pressure electromagnetic valve and used for controlling the opening of the high-temperature high-pressure electromagnetic valve to further control liquid circulation, the inner piston can be pushed to move after the liquid circulation, the other triode is connected with the pressure transmitter, the high-temperature battery packs are provided with two groups, one group of high-temperature battery packs is connected with the microprocessor and used for supplying power to the microprocessor, and the other group of high-temperature battery packs are connected with the two NPN triodes and used for supplying power to the pressure transmitter and the high-temperature electromagnetic valve.

2. The remote control toe end sliding sleeve opening system based on the pressure pulse signals as claimed in claim 1, wherein the microprocessor adopts an STM32L4 series single chip microcomputer, the STM32L4 series single chip microcomputer and NPN triodes are integrally welded by adopting a soldering technology, and an I/O port of the STM32L4 series single chip microcomputer is connected with base electrodes of the two NPN triodes to control conduction of an emitting electrode and a collecting electrode.

3. The remote control toe end sliding sleeve opening system based on the pressure pulse signals as claimed in claim 2, wherein a timer is arranged inside the STM32L4 series single chip microcomputer and used for regulating the triggering time of the pressure transmitter.

4. The pressure pulse signal based remote control toe end sliding sleeve opening system of claim 1, wherein the pressure transmitter is provided with threads and a sealing ring for sealing isolation.

5. The pressure pulse signal based remote control toe sleeve opening system of claim 1, wherein the pressure transmitter is an HM28 sapphire pressure transmitter.

6. The pressure pulse signal based remote control toe end sliding sleeve opening system of claim 1, wherein said two sets of high temperature battery packs are annularly wound on the sliding sleeve housing, the voltage of the high temperature battery pack supplying power to the microprocessor is 3.6V, and the voltage of the high temperature battery pack supplying power to the pressure transmitter and the high temperature high pressure solenoid valve is 24V.

7. The pressure pulse signal based remote control toe end sliding sleeve opening system of claim 1, wherein the working steps are as follows:

1) Starting the microprocessor to count down;

2) After the specified time is reached, the microprocessor sends out a control instruction, and the base electrode of an NPN triode connected with the pressure transmitter is electrified;

3) The collector and the emitter of the NPN triode connected with the pressure transmitter are conducted, and the pressure transmitter starts to work;

4) Transmitting a specific pressure pulse signal underground from the ground;

5) The pressure transmitter transmits a real-time signal to the microprocessor, the microprocessor decodes a digital signal transmitted by the pressure transmitter, obtains a control command according to a compiling program, and the base electrode of an NPN triode connected with the high-temperature high-pressure electromagnetic valve is electrified;

6) The collector and the emitter of the NPN triode connected with the high-temperature high-pressure electromagnetic valve are conducted, the high-temperature high-pressure electromagnetic valve is opened, and liquid in the tube circulates;

7) The liquid in the tube pushes the inner piston to move, and the toe end sliding sleeve is opened.

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