CN108678716A - A composite pipe layered water injection intelligent control system and method - Google Patents

Abstract

The invention provides a system and a method for intelligently controlling layered water injection of a composite pipe, which comprises a ground controller and the composite pipe, wherein the lower end of the composite pipe is connected with an oil pipe through a pipe connector, the oil pipe is connected with packers arranged up and down and an underground automatic control structure in series, the packers and the underground automatic control structure are provided with a plurality of groups, and the tail part of the oil pipe is provided with a check valve, a sieve pipe and a plug from top to bottom; the ground controller is electrically connected with the underground automatic control structure through a cable. The composite pipe has strong corrosion resistance, can effectively improve the long-term application reliability of the pipe column, and reduces the risk of field operation; the power supply line and the signal line are integrated in the composite pipe, so that the power supply and layered dynamic real-time monitoring of the underground control structure are met; the underground tool adopts a cable structure design, so that smooth realization of signals and power supply is ensured, and the reliability of real-time control is improved; the zonal flow real-time control and the remote real-time monitoring can greatly improve the qualification rate of zonal water injection.

Description

A composite pipe layered water injection intelligent control system and method

technical field

The invention belongs to the technical field of oilfield produced water reinjection wells, and in particular relates to an intelligent control system and method for composite pipe layered water injection.

Background technique

At present, the rapid development of fine water injection technology has greatly improved the effect of water flooding development in reservoirs. However, the number of directional wells and deep wells has increased year by year, and the measurement and adjustment of conventional technology is difficult. At the same time, conventional split injection strings mostly use ordinary packers in the way of lifting and unsealing as casing protection packers. When water injection wells are completed and set, pressure is used. In addition, with changes in water injection conditions, directional deep well strings will occur. Frequent peristalsis leads to packer unsealing failure, which restricts the long-term application reliability of the casing. Although non-metallic hydraulic anchors have been developed in recent years, which have controlled the peristalsis of the pipe string to a certain extent and avoided the failure of the packer, but it is difficult to unseal the pipe string during the string inspection later, and the number of manual downhole operations has not been reduced. Reduce the risk of downhole operations.

Contents of the invention

The object of the present invention is to provide an intelligent control system and method for layered water injection of composite pipes, which can overcome the problems of low pass rate of layered pipe strings and high risk of manual operation in the existing layered pipe strings.

For this reason, the present invention provides an intelligent control system for composite pipe layered water injection, which includes a ground controller and a composite pipe. Downhole automatic control structure, packer and downhole automatic control structure are equipped with multiple groups, and the tail of the tubing is installed with a check valve, screen and plug from top to bottom;

The surface controller is electrically connected to the downhole automatic control structure through cables, and the packer is a cable packer.

The downhole automatic control structure is composed of a casing, an automatic downhole monitoring device and a layered control valve, the downhole automatic monitoring device and the layered control valve are installed in the casing, the cable is composed of a signal line and a power supply line, and one end of the signal line is connected to the ground control The other end passes through the composite pipe and is electrically connected to the downhole automatic monitoring device. The downhole automatic monitoring device transmits the collected water injection well data to the ground controller through the signal line. One end of the power supply line is connected to the ground controller, and the other end passes through the composite pipe. Electrically connected to the stratified control valve.

The downhole automatic monitoring device is composed of a pressure sensor, a temperature sensor and a flow sensor.

The layered control valve is composed of a motor, an integrated faucet structure, a connecting rod and a valve core sequentially connected from top to bottom, and the surface controller controls the integrated faucet structure according to the pressure, temperature and flow data transmitted by the downhole automatic monitoring device. The opening of the faucet.

The composite pipe is made of non-metallic material, the inner cavity is provided with a main pipe, and the signal line and the power supply line are combined on the pipe wall of the composite pipe.

A control method for a composite pipe layered water injection intelligent control system, comprising the following steps:

Step 1: Connect composite pipes, pipe connectors, tubing, packers, downhole automatic control structures, check valves, screens and plugs to form pipe strings, and electrically connect the ground controller and downhole automatic control structures through cables, and then Go down into the well for electrical continuity test to make the downhole circuit unobstructed;

Step 2: Pressurize and set the tubing string in the well to set the packer, and then perform the electrical conductivity test again to make the downhole circuit unobstructed;

Step 3: Send instructions to the downhole automatic control structure through the ground controller, and the layered control valve opens the nozzle of the integrated nozzle structure to start water supply and injection, and then the surface controller sends an instruction to check the seal of the packer to complete the inspection. Sealing of packers;

Step 4: Set four different water injection pressures on the ground controller to perform downhole stratified water injection. The downhole automatic control structure automatically tests the stratified flow rate. The water injection pressure is measured for 30 minutes each time, and then the water absorption indicator curve is drawn according to the stratified flow rate;

Step 5: Establish communication with the ground controller through the remote control system. The ground controller establishes communication with the downhole automatic control structure and the layered control valve. The ground controller sends adjustment instructions to the layered control valve. After receiving the instruction, the layered control valve , adjust the stratified flow according to the instruction content, and then feed back the adjustment result to the ground controller. The ground controller repeats the previous measurement and adjustment process according to the geological injection requirements until the layered water injection volume meets the injection requirements.

The ground controller is divided into manual measurement and adjustment mode and automatic measurement and adjustment mode. In step 5, the ground controller can be selected as the automatic measurement and adjustment mode. The layered control valve automatically adjusts the layered flow according to the geological water distribution to achieve the qualified layered water distribution.

Beneficial effects of the present invention: the composite pipe layered water injection intelligent control system and method provided by the present invention have strong anti-corrosion ability of the composite pipe, can effectively improve the long-term application reliability of the pipe string, and reduce the risk of on-site operation; integrated power supply in the composite pipe Cable and signal line structure design to meet the downhole control structure power supply and layered dynamic real-time monitoring; downhole tools adopt cable structure design to ensure the smooth realization of signal and power supply, and improve the reliability of real-time control; layered flow real-time control and remote real-time Monitoring will greatly increase the qualification rate of layered water injection.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Figure 1 is a structural schematic diagram of an intelligent control system for layered water injection of composite pipes.

Explanation of reference signs: 1. Surface controller; 2. Composite pipe; 3. Pipe connector; 4. Signal line; 5. Packer; 6. Downhole automatic monitoring device; 7. Downhole automatic control structure; 8. Single Directional valve; 9. Screen pipe; 10. Plug; 11. Power supply line; 12. Layered control valve; 13. Oil pipe; 14. Cable.

Detailed ways

Example 1:

In order to overcome the problems of low qualified rate of delamination of existing delamination strings and high risk of manual operation, this embodiment provides an intelligent control system for delamination water injection of composite pipes, as shown in Figure 1, including a ground controller 1, It also includes composite pipe 2, the lower end of composite pipe 2 is connected to oil pipe 13 through pipe connector 3, and oil pipe 13 is connected in series with packer 5 and downhole automatic control structure 7 arranged up and down, and packer 5 and downhole automatic control structure 7 are set There are multiple groups, and the tail of the tubing 13 is equipped with a one-way valve 8, a screen 9 and a plug 10 from top to bottom; the ground controller 1 is electrically connected to the downhole automatic control structure 7 through a cable 14, and the packer 5 Cable packers are used. The over-cable packer adopts over-cable structure design to realize the seal structure of the packer across the cable, and the upper and lower strings of the packer can meet the power supply and signal connection. It should be noted that the ground controller and the cable-passing packer are prior art, and their specific structures are not used as the protection point of the present invention, and will not be described in detail here. As shown in FIG. 1 , each downhole automatic control structure 7 corresponds to a water injection layer.

The use process of the composite pipe layered water injection intelligent control system is as follows:

The testing and deployment technicians establish communication with the ground controller 1 through the remote control system, and the ground controller 1 establishes communication with the downhole automatic control structure 7. The ground controller 1 sends adjustment instructions to the downhole automatic control structure 7, and the downhole automatic control structure 7 receives After the instruction, adjust the stratified flow rate according to the instruction content, and then feed back the adjustment result to the ground controller 1. The ground controller 1 repeats the previous measurement and adjustment process according to the geological injection requirements until the layered water injection volume meets the injection requirements.

The ground controller 1 is divided into a manual measurement and adjustment mode and an automatic measurement and adjustment mode. The manual measurement and adjustment mode is adopted in step 5, and the ground controller 1 can also be selected as the automatic measurement and adjustment mode. , Automatically adjust the stratified flow to achieve qualified stratified water distribution.

The surface controller 1 establishes communication with the remote control system and downhole tools by means of cables to realize remote two-way communication control and data transmission.

Example 2:

On the basis of Embodiment 1, the downhole automatic control structure 7 is composed of a housing, a downhole automatic monitoring device 6 and a layered control valve 12, the downhole automatic monitoring device 6 and the layered control valve 12 are installed in the housing, and the cable 14 It is composed of a signal line 4 and a power supply line 11. One end of the signal line 4 is connected to the ground controller 1, and the other end is electrically connected to the downhole automatic monitoring device 6 through the composite pipe 2. The downhole automatic monitoring device 6 passes the collected water injection well data through the signal The line 4 is transmitted to the ground controller 1 , one end of the power supply line 11 is connected to the ground controller 1 , and the other end is electrically connected to the layered control valve 12 through the composite pipe 2 .

Composite pipe 2 is designed with non-metallic materials to meet the technical requirements of downhole packer setting 15MPa anti-internal pressure and normal water injection. A main pipe structure is designed internally, pipe wall composite power supply line 11 and signal line 4, wellhead and surface controller 1 , downhole through the composite pipe string connector 3 respectively connected with the power supply line 11 and the signal line 4 of the lower stratified water injection pipe, and then electrically connected with the downhole automatic monitoring device 6 and the stratified control valve 12 to meet the purpose of remote real-time monitoring. The ground controller 1 collects dynamic data such as flow rate, pressure, and temperature of downhole layers of water injection wells, and at the same time realizes remote real-time control of layered flow rates, improves the reliability of control and the convenience of later maintenance, reduces the risk of downhole operations, and greatly improves the level of distribution. The pass rate of layer water injection was improved, and the management level of separate injection wells was improved.

The test deployment technician establishes communication with the ground controller 1 through the remote control system, and the ground controller 1 establishes communication with the downhole automatic control structure 7 and the layered control valve 12, and the ground controller 1 sends the adjustment instruction to the layered control valve 12, After receiving the instruction, the stratified control valve 12 adjusts the stratified flow rate according to the content of the instruction, and then feeds back the adjustment result to the ground controller 1. The ground controller 1 repeats the previous measurement and adjustment process according to the geological injection requirements until the stratified water injection volume Until the allocation requirements are met.

Example 3:

On the basis of Embodiment 2, the downhole automatic monitoring device 6 is composed of a pressure sensor, a temperature sensor and a flow sensor, and real-time monitoring and real-time transmission of layered dynamic data.

Example 4:

On the basis of Embodiment 2, the layered control valve 12 is composed of a motor, an integrated faucet structure, a connecting rod and a valve core connected sequentially from top to bottom, and the ground controller 1 is based on the pressure transmitted by the downhole automatic monitoring device 6. , temperature and flow data to control the opening of the faucet in the integrated faucet structure. The layered control valve 12 is designed with an integrated motor and an integrated faucet structure to control the layered flow in real time.

Example 5:

On the basis of Example 2, the composite pipe 2 is made of non-metallic material, the inner cavity is provided with a main pipe, and the signal line 4 and the power supply line 11 are composited on the pipe wall of the composite pipe 2 .

Embodiment 6:

A control method for a composite pipe layered water injection intelligent control system, comprising the following steps:

Step 1: Connect composite pipe 2, pipe connector 3, tubing 13, packer 5, downhole automatic control structure 7, check valve 8, screen pipe 9 and plug 10 to form a pipe string, and electrically connect to the ground through cable 14 The controller 1 and the downhole automatic control structure 7 are then lowered into the well for electrical continuity testing to make the downhole circuit unobstructed;

Step 2: Pressurize and set the tubing string in the well to set the packer 5, and then perform the electrical conductivity test again to make the downhole circuit unobstructed;

Step 3: The ground controller 1 sends an instruction to the downhole automatic control structure 7, and the layered control valve 12 opens the water nozzle of the integrated water nozzle structure to start water supply and injection, and then the surface controller 1 sends a test for the packer 5. seal instruction, and complete the seal inspection of the packer 5;

Step 4: Set four different water injection pressures on the surface controller 1, and carry out downhole stratified water injection. The downhole automatic control structure 7 automatically tests the stratified flow rate, and measures the water injection pressure for 30 minutes each time, and then draws the water absorption indicator curve according to the stratified flow rate ;

Step 5: Test and deployment technicians establish communication with the ground controller 1 through the remote control system, the ground controller 1 establishes communication with the downhole automatic control structure 7, and the layered control valve 12, and the ground controller 1 sends adjustment instructions to the layered control After the valve 12 and the stratification control valve 12 receive the instructions, they adjust the stratification flow according to the contents of the instructions, and then feed back the adjustment results to the ground controller 1. The ground controller 1 repeats the previous measurement and adjustment process according to the geological distribution requirements until Layer water injection volume meets the distribution requirements.

The ground controller 1 is divided into manual measurement and adjustment mode and automatic measurement and adjustment mode. In step 5, the ground controller 1 can be selected as the automatic measurement and adjustment mode. The stratification control valve 12 automatically adjusts the stratification flow according to the geological water distribution to achieve stratification. The water distribution is qualified.

The above examples are only illustrations of the present invention, and do not constitute a limitation to the protection scope of the present invention. All designs that are the same as or similar to the present invention fall within the protection scope of the present invention. The components and structures not described in detail in this embodiment are known components and common structures or common means in this industry, and are not described here one by one.

Claims (7)

1. An intelligent control system for composite pipe layered water injection, including a ground controller (1), characterized in that it also includes a composite pipe (2), and the lower end of the composite pipe (2) is connected to the oil pipe ( 13), the tubing (13) is connected to the upper and lower packers (5) and the downhole automatic control structure (7). There are multiple sets of packers (5) and the downhole automatic control structure (7). ) tail is installed with check valve (8), screen pipe (9) and plug (10) from top to bottom; The ground controller (1) is electrically connected to the downhole automatic control structure (7) through a cable (14), and the packer (5) is a cable packer. 2. The composite pipe layered water injection intelligent control system according to claim 1, characterized in that: the downhole automatic control structure (7) is composed of a housing, a downhole automatic monitoring device (6) and a layered control valve (12) The downhole automatic monitoring device (6) and layered control valve (12) are installed in the casing, the cable (14) is composed of a signal line (4) and a power supply line (11), and one end of the signal line (4) is connected to the ground controller (1), the other end passes through the composite pipe (2) and is electrically connected to the downhole automatic monitoring device (6), and the downhole automatic monitoring device (6) transmits the collected water injection well data to the ground controller ( 1), one end of the power supply line (11) is connected to the ground controller (1), and the other end is electrically connected to the layered control valve (12) through the composite pipe (2). 3. The composite pipe layered water injection intelligent control system according to claim 2, characterized in that: the downhole automatic monitoring device (6) is composed of a pressure sensor, a temperature sensor and a flow sensor. 4. The composite pipe layered water injection intelligent control system according to claim 2, characterized in that: the layered control valve (12) consists of a motor, an integrated faucet structure, a connecting rod and a valve core in sequence from top to bottom. The surface controller (1) controls the opening of the water nozzle in the integrated water nozzle structure according to the pressure, temperature and flow data transmitted by the downhole automatic monitoring device (6). 5. The composite pipe layered water injection intelligent control system according to claim 2, characterized in that: the composite pipe (2) is made of non-metallic material, and the inner cavity is provided with a main pipe, a signal line (4) and a power supply line (11) Composite on the pipe wall of the composite pipe (2). 6. A control method for the composite pipe layered water injection intelligent control system according to any one of claims 1 to 5, characterized in that it comprises the following steps: Step 1: Connect composite pipe (2), pipe connector (3), tubing (13), packer (5), downhole automatic control structure (7), check valve (8), screen (9) and The plug (10) becomes a pipe string, and is electrically connected to the ground controller (1) and the downhole automatic control structure (7) through the cable (14), and then it is lowered into the well for electrical conductivity testing, so that the downhole circuit is unobstructed; Step 2: Pressurize and set the pipe string in the well to set the packer (5), and then perform the electrical conductivity test again to make the downhole circuit unobstructed; Step 3: Send instructions to the downhole automatic control structure (7) through the surface controller (1), and the layered control valve (12) opens the water nozzle of the integrated water nozzle structure to start water supply, and then the surface controller (1) Send the seal inspection instruction for the packer (5) to complete the seal inspection for the packer (5); Step 4: Set four different water injection pressures on the surface controller (1) to carry out downhole layered water injection. The downhole automatic control structure (7) automatically tests the layered flow rate. The water injection pressure is measured for 30 minutes each time, and then according to the layered flow rate Draw water absorption indicator curve; Step 5: Establish communication with the ground controller (1) through the remote control system, the ground controller (1) establishes communication with the downhole automatic control structure (7) and the layered control valve (12), and the ground controller (1) will adjust The instruction is sent to the stratification control valve (12), and after receiving the instruction, the stratification control valve (12) adjusts the stratification flow according to the instruction content, and then feeds back the adjustment result to the ground controller (1), and the ground controller (1) According to the geological injection requirements, repeat the previous measurement and adjustment process until the layered water injection volume meets the injection requirements. 7. The control method of the composite pipe layered water injection intelligent control system according to claim 6, characterized in that: the ground controller (1) is divided into a manual measurement and adjustment mode and an automatic measurement and adjustment mode, and in step 5 the ground controller ( 1) The automatic measurement and adjustment mode can be selected, and the stratified control valve (12) automatically adjusts the stratified flow rate according to the geological water distribution to achieve the qualified stratified water distribution.