阅读说明：本技术 注水井长期在线智能解堵系统 (Long-term online intelligent blockage removing system for water injection well ) 是由 孙林 黄波 易飞 杨万有 陈维余 刘春祥 黄利平 夏光 杨军伟 李旭光 熊培祺 于 2020-03-25 设计创作，主要内容包括：本发明公开了注水井长期在线智能解堵系统,包括三通阀、酸化管线、控制阀、在线酸化撬和数据采集及控制终端。本发明用于注水井长期在线解堵作业,可实时诊断及实施注水井解堵,避免海上平台等偏远地区、狭小空间解堵作业的不及时性；大大简化解堵作业规模及大量节省作业空间,有利用于海上小空间平台和作业量繁多的井况作业；可进一步扩大解堵半径,并实现解堵作业的长效性；实现解堵作业的数据远程传输监测及物联控制,促进解堵作业的数字化、智能化、无人化。(The invention discloses a long-term online intelligent blockage removing system for a water injection well, which comprises a three-way valve, an acidification pipeline, a control valve, an online acidification pry and a data acquisition and control terminal. The invention is used for long-term on-line blockage removal operation of the water injection well, can diagnose and implement blockage removal of the water injection well in real time, and avoids untimely blockage removal operation in remote areas and narrow spaces such as offshore platforms; the scale of the blockage removal operation is greatly simplified, the operation space is greatly saved, and the device is favorable for offshore small-space platform and well operation with various operation amount; the blockage removing radius can be further enlarged, and the long-acting performance of blockage removing operation is realized; the data remote transmission monitoring and the internet of things control of the blockage removing operation are realized, and the digitization, the intellectualization and the unmanned performance of the blockage removing operation are promoted.)

1. Long-term online intelligent unblocking system of water injection well, its characterized in that: the system comprises a three-way valve, an acidification pipeline, a control valve, an online acidification pry and a data acquisition and control terminal;

two ends of the three-way valve are connected with a water injection flow pipeline, and one end of the three-way valve is connected with an acidification pipeline;

the three-way valve, the control valve and the online acidification pry are connected through acidification pipelines, the three-way valve is provided with a first pressure sensor and a first flow sensor, and a second pressure sensor and a second flow sensor are arranged on the acidification pipeline between the control valve and the online acidification pry;

the on-line acidification skid comprises an acidification pump, an acidification tank, a dosing pump, an on-line monitoring and data transmission system and a dosing control system, wherein the acidification pump, the acidification tank and the dosing pump are sequentially connected through an acidification pipeline, the dosing pump is connected with a medicament container, a low liquid level sensor and a high liquid level sensor are arranged in the acidification tank, and the on-line monitoring and data transmission system is connected with a first pressure sensor, a second pressure sensor, a first flow sensor and a second flow sensor to realize the acquisition of pressure and flow data and is connected with a control valve to realize the control of the opening and closing of the control valve; the dosing control system is connected with the low liquid level sensor and the high liquid level sensor to acquire liquid level information, and is connected with the dosing pump to control the dosing process;

the on-line monitoring and data transmission system, the on-line monitoring and data transmission system and the dosing control system are in wireless connection to realize communication and information interaction.

2. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: and a check valve in the direction from the acidification pump to the water injection flow pipeline is arranged after the control valve is opened.

3. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: the pressure resistance of the three-way valve, the acidification pipeline and the control valve is not lower than 30 MPa.

4. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: the pump pressure of the acidification pump is not lower than 20 MPa.

5. The long-term on-line intelligent blockage relieving system for the water injection well according to claim 1 is characterized in that the liquid suction displacement of the dosing pump is not lower than 150L/min.

6. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: the capacity of the acidification tank is 1-6 m³。

7. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: the pressure sensors on the three-way valve and in the acidification pipeline before on-line acidification prying have the highest pressure measurement range of not less than 20MPa and the measurement precision of at least 0.1 MPa.

8. The long-term on-line intelligent blockage relieving system for the water injection well according to claim 1 is characterized in that the highest range of the flow measured by a flow sensor on the three-way valve is not lower than 350L/min, and the measurement accuracy is at least 10L/min.

9. The long-term online intelligent blockage relieving system for the water injection well according to claim 1 is characterized in that the highest flow measuring range of a flow sensor in an acidizing pipeline before online acidizing prying is not lower than 4.2L/min, and the measuring accuracy is at least 0.01L.

10. The long-term online intelligent blockage relieving system for the water injection well according to claim 1, characterized in that: the acidification tank is filled with matched blockage removing liquid, and the blockage removing liquid is a single-stage plugging agent and can be a combination of a surfactant, a chelating agent, fluorine-containing retarded acid, a corrosion inhibitor and an anti-swelling agent.

Technical Field

The invention belongs to the technical field of oil field production increase, and particularly relates to a long-term online intelligent blockage removing system for a water injection well.

Background

The water injection well acidification and blockage removal technology is one of main yield increasing technical means of various large oil fields in China at present, according to statistics, the acidification and blockage removal operation of the water injection well is implemented by the Bohai oil field for more than 400 wells every year at present, and the excellent effect of reducing pressure and increasing injection is realized.

However, the oilfield acidizing and plugging removal technology also has some technical problems, for example, after the offshore oilfield acidizing and plugging removal operation is generally seriously damaged and is subjected to conventional procedures such as oil reservoir diagnosis, ocean transportation, field scheduling and the like, the implemented effectiveness is greatly reduced, and the implementation effect is not as good as that in the initial damage stage; in partial remote areas or narrow spaces, a large amount of skid-mounted or vehicle equipment is involved in the acidification blockage removal operation, and the acidification blockage removal operation is difficult to implement; the repeated acidification of the well is repeated for many times, the near-well corrosion and blockage removal capacity is limited, and the acidification radius needs to be further enlarged; with the development of industry 4.0, the acidification blockage removal technology with a large construction well proportion also faces the technology upgrading examination.

The prior on-line acidification and blockage removal technology also solves the problems of construction scale and space scale, and mainly comprises CN204609856U 'mobile water injection well on-line acidification device', CN106761616A 'construction operation manifold for water injection well on-line injection acidification', CN106833577A 'a construction method for clearing and preventing scale on-line acidification and multi-section plug, CN 107905767A' a method for clearing and preventing scale on-line acidification of a water injection well ', CN 208203249U' a convenient and mobile on-line acidification device ', and CN 2209339922U' equipment for on-line acidification process ', and offshore oil field water injection well single-step on-line acidification technology' (Liuping, Zhangluo, Pangyong, etc.. offshore oil field water injection well single-step on-line acidification technology [ J ]. southwest Petroleum institute (Nature science edition), 2014, 36 (5): 148) 154 ], and 'active acid water injection well on-line acidification technology' (Sun forest, Mengjiang river, Hongjiang river, etc.. Bohai sea oil field acidification research [ J ]. low-efficiency oil and gas research, 2016, 23(3): 144-147).

However, the technology mainly uses short-term online, matched acidizing equipment or pipelines are dismantled or moved, the related acid system is of an original system type or is intelligent acid or active acid and does not have the characteristics required by long-term online acidizing, reservoir damage is still aggravated continuously along with continuous water injection, the short-term online acidizing blockage removing technology is only a technology with a specific application range and a specific period and is not suitable for places such as an offshore platform where large liquid amount is injected for a long time, the platform space is limited, the marine transportation period is long, and the platform operation task is heavy, so that the short-term online acidizing time needs to be prolonged urgently, and a long-term online acidizing blockage removing system is provided.

In summary, a long-term online intelligent blockage removing system for a water injection well and an implementation method thereof are lacked in China at present.

Disclosure of Invention

The invention provides a long-term online intelligent blockage removing system for a water injection well, which realizes the fixation of blockage removing equipment in a water injection process, realizes the real-time, miniaturization and long-term blockage removing operation, realizes the remote data transmission monitoring and the internet of things control, is an upgrade on the existing online acidification blockage removing patent technology, overcomes the defects of the existing acidification blockage removing technology and the online acidification blockage removing technology, and fills the blank of the existing related fields at home and abroad.

The purpose of the invention is realized by the following technical scheme:

the long-term online intelligent blockage removing system for the water injection well comprises a three-way valve, an acidification pipeline, a control valve, an online acidification pry and a data acquisition and control terminal;

two ends of the three-way valve are connected with a water injection flow pipeline, and one end of the three-way valve is connected with an acidification pipeline;

the three-way valve, the control valve and the online acidification pry are connected through acidification pipelines, the three-way valve is provided with a first pressure sensor and a first flow sensor, and a second pressure sensor and a second flow sensor are arranged on the acidification pipeline between the control valve and the online acidification pry;

the on-line acidification skid comprises an acidification pump, an acidification tank, a dosing pump, an on-line monitoring and data transmission system and a dosing control system, wherein the acidification pump, the acidification tank and the dosing pump are sequentially connected through an acidification pipeline, the dosing pump is connected with a medicament container, a low liquid level sensor and a high liquid level sensor are arranged in the acidification tank, and the on-line monitoring and data transmission system is connected with a first pressure sensor, a second pressure sensor, a first flow sensor and a second flow sensor to realize the acquisition of pressure and flow data and is connected with a control valve to realize the control of the opening and closing of the control valve; the dosing control system is connected with the low liquid level sensor and the high liquid level sensor to acquire liquid level information, and is connected with the dosing pump to control the dosing process;

the on-line monitoring and data transmission system, the on-line monitoring and data transmission system and the dosing control system are in wireless connection to realize communication and information interaction, and can be remotely realized by controlling the on-line monitoring and data transmission system: (1) the control method comprises the following steps of (1) monitoring the pressure and the flow in a three-way valve and an acidification pipeline in real time, (2) controlling the opening relation of a control valve, (3) monitoring liquid level information in a dosing pump, and (4) controlling the dosing pump;

in the technical scheme, the parts of the three-way valve, the acidification pipeline, the control valve and the dosing pump, which are in contact with the acid, are made of Ha-type alloy materials.

In the technical scheme, the control valve is a check valve in the direction from the acidification pump to the water injection flow pipeline after being opened.

In the technical scheme, the acidification tank is internally made of glass fiber reinforced plastic materials.

In the technical scheme, the pressure resistance of the three-way valve, the acidification pipeline and the control valve is not lower than 30 MPa.

In the technical scheme, the pumping pressure of the acidification pump is not lower than 20 MPa.

In the technical scheme, the liquid suction displacement of the dosing pump is not less than 150L/min.

In the technical scheme, the capacity of the acidification tank is 1-6 m³。

In the technical scheme, the highest pressure measuring range of the pressure sensors on the three-way valve and in the acidification pipeline before on-line acidification prying is not lower than 20MPa, and the measuring precision is at least 0.1 MPa.

In the technical scheme, the highest range of the flow measured by the flow sensor on the three-way valve is not lower than 350L/min, and the measurement accuracy is at least 10L/min.

In the technical scheme, the highest range of the flow measured by the flow sensor in the acidizing pipeline before on-line acidizing prying is not lower than 4.2L/min, and the measurement accuracy is at least 0.01L.

In the technical scheme, the acidification tank is filled with matched blockage removing liquid, and the blockage removing liquid is a single-stage plugging agent and can be a combination of a surfactant, a chelating agent, fluorine-containing retarded acid, a corrosion inhibitor and an anti-swelling agent.

The implementation method of the long-term online intelligent blockage removing system for the water injection well comprises the following steps:

(1) installing a long-term online intelligent blockage removing system of a water injection well by additionally installing a three-way valve in a platform water injection flow;

(2) the pressure and the discharge capacity of the water injection well are monitored in real time through a pressure sensor and a flow sensor in a three-way valve, data acquisition is carried out through a data acquisition and control terminal, and an engineer determines whether to start an online acidification program or not according to data change;

(3) starting an online acidification program: and the data acquisition and control terminal simultaneously starts the control valve and the acidification pump and adjusts the pump injection displacement of the acidification pump according to the acquisition data of the water injection pressure and the water injection displacement. An engineer determines whether to close the online acidification program according to the change of the collected data;

(4) closing an online acidification program: the data acquisition and control terminal closes the control valve and the acidification pump at the same time;

(5) when the plugging removal liquid in the acidification tank reaches the position of the low liquid level sensor, the online monitoring and data transmission system and the data acquisition and control terminal give an alarm, and an online acidification program is automatically closed;

(6) adding chemicals into an acidification tank: the dosing pump is connected with the barreled blockage removing liquid transported in place from the outside through the acidification pipeline, the dosing pump is started through the dosing control system, and when the blockage removing liquid in the acidification tank reaches the position of the high liquid level sensor, the dosing pump automatically stops.

Compared with the prior art, the invention has the following advantages and progresses:

1. the invention is used for long-term on-line blockage removal operation of the water injection well, can diagnose and implement blockage removal of the water injection well in real time, and avoids the untimely time of blockage removal operation in remote areas and narrow spaces such as offshore platforms.

2. Greatly simplifies the blockage removal operation scale and greatly saves the operation space, and is favorable for offshore small-space platform and well operation with various operation amount.

3. The blockage removing radius can be further enlarged, and the long-term effect of blockage removing operation is realized.

4. The data remote transmission monitoring and the internet of things control of the blockage removing operation are realized, and the digitization, the intellectualization and the unmanned performance of the blockage removing operation are promoted.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

The system comprises a pressure sensor, a pressure sensor and a controller, wherein 1 is a three-way valve, 2 is an acidification pipeline, 3 is a control valve, 4 is an online acidification pry, 5 is a data acquisition and control terminal, 6 is a water injection flow pipeline; 8 is a second pressure sensor, 9 is a first flow sensor, 10 is a second flow sensor, 11 is an acidification pump, 12 is an acidification tank, 13 is a dosing pump, and 14 is an online monitoring and data transmission system; 15 is a dosing control system, 16 is a low liquid level sensor, 17 is a high liquid level sensor, and 18 is a data line.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.