阅读说明：本技术 一种自动供配液系统 (Automatic liquid supply and distribution system ) 是由 王敬平 宋艳春 关晓辉 董思 赵怀洲 张天威 胡德文 周迎春 刘剑 于 2019-09-03 设计创作，主要内容包括：本发明涉及油田装备技术领域,尤其涉及一种自动供配液系统。包括：主供液系统,副供液系统、液添系统以及自动控制系统；其中,所述主供液系统用于向混砂车进行供液；所述副供液系统用于向配酸设备和配液设备提供不同排量的清水；所述液添系统与主供液系统连接；所述自动控制系统与主供液系统、副供液系统和液添系统连接；自动控制系统利用第一流量变送器获取流量数据；当流量数据大于或等于流量阈值时,生成停止指令；当流量数据小于流量阈值时,生成开启指令。本发明提供自动供配液系统,以克服现有技术中的远程供水供液设备结构简单,功能单一,人工操作复杂,作业周期长、效率低的问题。(The invention relates to the technical field of oilfield equipment, in particular to an automatic liquid supply and distribution system. The method comprises the following steps: the system comprises a main liquid supply system, an auxiliary liquid supply system, a liquid adding system and an automatic control system; the main liquid supply system is used for supplying liquid to the sand mixing truck; the auxiliary liquid supply system is used for supplying clear water with different discharge capacities to the acid preparation equipment and the liquid preparation equipment; the liquid adding system is connected with the main liquid supply system; the automatic control system is connected with the main liquid supply system, the auxiliary liquid supply system and the liquid adding system; the automatic control system acquires flow data by using the first flow transmitter; when the flow data is greater than or equal to the flow threshold, generating a stop instruction; and when the flow data is smaller than the flow threshold value, generating an opening instruction. The invention provides an automatic liquid supply and distribution system, which aims to solve the problems of simple structure, single function, complex manual operation, long operation period and low efficiency of remote water supply and liquid supply equipment in the prior art.)

1. An automatic liquid supply and dispensing system, comprising: the system comprises a main liquid supply system, an auxiliary liquid supply system, a liquid adding system and an automatic control system;

the main liquid supply system is used for supplying liquid to the sand mixing truck and comprises a main centrifugal pump, a variable-frequency explosion-proof motor, a first flow transmitter, a pressure transmitter, a main liquid supply suction manifold and a main liquid supply discharge manifold;

the auxiliary liquid supply system is used for providing clear water with different discharge capacities to the acid distribution equipment and the liquid distribution equipment and comprises an auxiliary centrifugal pump, a variable-frequency explosion-proof motor, a second flow transmitter and a pressure transmitter;

the liquid adding system is connected with the main liquid supply system and used for supplying additives to the main liquid supply suction manifold during liquid distribution, and comprises a gear pump, a variable-frequency explosion-proof motor, a third flow transmitter and a pressure transmitter;

the automatic control system is connected with the main liquid supply system, the auxiliary liquid supply system and the liquid adding system;

the automatic control system is arranged in an explosion-proof control chamber, and a positive pressure air source, a refrigeration air conditioner and a frequency converter are arranged in the explosion-proof control chamber;

the automatic control system acquires flow data by using a first flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a main centrifugal pump in the main liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a main centrifugal pump in the main liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a second flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a third flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a gear pump in the liquid adding system according to the stop instruction; and when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a gear pump in the liquid adding system according to the opening instruction.

2. The automatic liquid supply and distribution system as claimed in claim, wherein the variable frequency explosion-proof variable frequency motor is driven and controlled by a frequency converter, a large amount of heat generated during the operation of the frequency converter is cooled by a refrigeration air conditioner, and the positive pressure gas source fills gas into the control chamber to accelerate the circulation of the gas.

Technical Field

The invention relates to the technical field of oilfield equipment, in particular to an automatic liquid supply and distribution system.

Background

At present, with the large-scale development of shale gas in China, the shale gas fracturing construction scale is larger and larger, a large amount of water supply and liquid preparation are needed in each construction link, and especially in the fracturing well completion link, the water consumption basically reaches tens of thousands of meters.

In the field of fracturing matching equipment, the remote water and liquid supply equipment has higher technical content and is mainly used for continuously supplying liquid to a sand mixer truck and supplying clear water to acid mixing equipment and liquid preparation equipment during fracturing operation. At present, mainstream remote water supply and liquid supply equipment on the market is simple in structure, and the function is too single, often has following several problems in the use:

(1) the discharge capacity is large when the liquid is supplied to the sand mixing truck, and the discharge capacity is greatly reduced when a single centrifugal pump unit turns to supply water to other equipment, so that the motor is overloaded and runs at a low speed for a long time;

(2) when turning to other equipment for supplying water and preparing liquid, the manual valve opening and closing of the operator is needed, so that the labor cost is increased, and the operation time is prolonged;

(3) a large amount of heat generated by the control system during working depends on natural ventilation, and the heat cannot be quickly dissipated, so that the frequency converter is easily stopped working at high temperature.

Disclosure of Invention

Technical problem to be solved

The invention provides an automatic liquid supply and distribution system, which aims to solve the problems of simple structure, single function, complex manual operation, long operation period and low efficiency of remote water supply and liquid supply equipment in the prior art.

(II) technical scheme

In order to solve the above problems, the present invention provides an automatic liquid supply and distribution system, comprising: the system comprises a main liquid supply system, an auxiliary liquid supply system, a liquid adding system and an automatic control system;

the main liquid supply system is used for supplying liquid to the sand mixing truck and comprises a main centrifugal pump, a variable-frequency explosion-proof motor, a first flow transmitter, a pressure transmitter, a main liquid supply suction manifold and a main liquid supply discharge manifold;

the auxiliary liquid supply system is used for providing clear water with different discharge capacities to the acid distribution equipment and the liquid distribution equipment and comprises an auxiliary centrifugal pump, a variable-frequency explosion-proof motor, a second flow transmitter and a pressure transmitter;

the liquid adding system is connected with the main liquid supply system and used for supplying additives to the main liquid supply suction manifold during liquid distribution, and comprises a gear pump, a variable-frequency explosion-proof motor, a third flow transmitter and a pressure transmitter;

the automatic control system is connected with the main liquid supply system, the auxiliary liquid supply system and the liquid adding system;

the automatic control system is arranged in an explosion-proof control chamber, and a positive pressure air source, a refrigeration air conditioner and a frequency converter are arranged in the explosion-proof control chamber;

the automatic control system acquires flow data by using a first flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a main centrifugal pump in the main liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a main centrifugal pump in the main liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a second flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a third flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a gear pump in the liquid adding system according to the stop instruction; and when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a gear pump in the liquid adding system according to the opening instruction.

Preferably, the variable-frequency explosion-proof variable-frequency motor is driven and controlled by the frequency converter to operate, a large amount of heat generated when the frequency converter works is cooled by the refrigeration air conditioner, and the positive pressure gas source can fill gas into the control chamber to accelerate the circulation of the gas.

(III) advantageous effects

The automatic liquid supply and distribution system provided by the invention has the following advantages:

(1) the shunt liquid supply technology is adopted, so that the long-time work of a single pump is avoided, the working load of the unit is reduced, and the service life of the motor is prolonged.

(2) Through the automatic control system, the start, stop and switching can be automatically controlled during water supply and liquid supply, the operation of manually opening and closing the valve is avoided, and the operation efficiency is improved.

(3) Through installing positive pressure air supply on the control room for gaseous circulation, effectual indoor temperature of control guarantees the converter and normally works.

(4) The automatic liquid adding control technology is adopted to carry out linkage control on the discharge capacities of the main liquid supply system and the liquid adding system, so that the volume ratio of the prepared liquid is kept unchanged, and manual adjustment is avoided.

Drawings

Fig. 1 is a schematic structural diagram of an automatic liquid supply and distribution system according to an embodiment of the present invention.

In the figure:

1-an auxiliary liquid supply system; 2-liquid addition system; 3-a main liquid supply system; 4-a main liquid supply suction manifold; 5-explosion-proof control room; 6-main liquid supply and discharge manifold; 7-auxiliary liquid supply and discharge manifold.

Detailed Description

The present invention will be described in detail below with reference to the drawings and examples.

As shown in fig. 1, an embodiment of the present invention provides an automatic liquid supply and distribution system, including: a main liquid supply system 3, an auxiliary liquid supply system 1, a liquid adding system 2 and an automatic control system;

the main liquid supply system 3 is used for supplying liquid to the sand mixing truck and comprises a main centrifugal pump, a variable-frequency explosion-proof motor, a flow transmitter, a pressure transmitter, a main liquid supply suction manifold 4 and a main liquid supply discharge manifold 6;

the auxiliary liquid supply system 1 is used for providing clear water with different discharge capacities for acid preparation equipment and liquid preparation equipment, and comprises an auxiliary centrifugal pump, a variable-frequency explosion-proof motor, a flow transmitter, a pressure transmitter and an auxiliary liquid supply and discharge manifold 7;

the liquid adding system 2 is connected with the main liquid supply system 3 and used for supplying additives to the main liquid supply suction manifold during liquid preparation, and comprises a gear pump, a variable-frequency explosion-proof motor, a flow transmitter and a pressure transmitter; in practical applications, the additive may be a friction reducer.

The automatic control system is connected with the main liquid supply system 3, the auxiliary liquid supply system 1 and the liquid adding system 2;

the automatic control system is installed in an explosion-proof control chamber 5, and a positive pressure air source, a refrigeration air conditioner and a frequency converter are arranged in the explosion-proof control chamber 5.

The automatic control system acquires flow data by using a first flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a main centrifugal pump in the main liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a main centrifugal pump in the main liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a second flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the stop instruction; when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of an auxiliary centrifugal pump in the auxiliary liquid supply system according to the opening instruction;

the automatic control system acquires flow data by using a third flow transmitter, and compares the acquired flow data with a preset flow threshold; when the flow data is larger than or equal to the flow threshold, generating a stop instruction, and closing a valve of a gear pump in the liquid adding system according to the stop instruction; and when the flow data is smaller than the flow threshold, generating an opening instruction, and continuously opening a valve of a gear pump in the liquid adding system according to the opening instruction.

Specifically, a flow transmitter and a pressure transmitter in the main liquid supply system transmit flow and pressure variation to an automatic control system, and the automatic control system monitors the pressure in a manifold and the discharge capacity of liquid in real time;

the flow transmitter and the pressure transmitter in the auxiliary liquid supply system transmit the flow and the pressure variable quantity to an automatic control system, and the automatic control system monitors the pressure in a manifold and the discharge capacity of liquid in real time;

the liquid adding system is in linkage fit with the main liquid supply system, the discharge capacity of the liquid adding system is adjusted along with the change of the discharge capacity of the main liquid supply system, and the volume concentration of the prepared liquid is guaranteed to be unchanged.

The automatic control system also comprises a touch display screen, and on the interface of the touch display screen, water and liquid can be automatically controlled and selected to be supplied to any connecting equipment, and the required supply displacement of each equipment is set. All explosion-proof variable frequency motors in the equipment are driven and controlled by the frequency converter to operate, a large amount of heat generated when the frequency converter works is cooled by the refrigeration air conditioner, and the positive pressure air source can fill air into the control chamber to accelerate the circulation of the air, so that the indoor temperature is kept within the normal working range of the frequency converter.

The frequency conversion explosion-proof variable frequency motor is driven and controlled by the frequency converter to operate, a large amount of heat generated when the frequency converter works is cooled by the refrigeration air conditioner, and the positive pressure gas source can fill gas into the control room to accelerate the circulation of the gas.

The working process of the automatic liquid supply and distribution system is described in detail below, and when the automatic liquid supply and distribution equipment is used for supplying and distributing water automatically, all the liquid supply pipelines are connected according to the operation process of the fracturing distribution equipment in the actual well site.

When the liquid preparation and supply operation is carried out, a start button of a control system in the explosion-proof control chamber 5 is pressed, the liquid preparation concentration and the required discharge capacity are set in a touch display screen operation system, after the start operation, the liquid addition system 2 injects additives into the main liquid supply suction manifold 4, the discharge capacity of the liquid addition system 2 is adjusted according to signals fed back by flow transmitters on the liquid addition system 2 and the main liquid supply system 3, the volume concentration of the prepared liquid is ensured to be unchanged, and after the liquid preparation is stirred by a centrifugal pump, the prepared liquid is discharged into corresponding equipment by the main liquid supply discharge manifold 6.

When clear water supply operation is carried out, a start button of a control system in the explosion-proof control chamber 5 is pressed, the required displacement is set in the touch display screen operation system, the auxiliary liquid supply system 1 is started to carry out water supply operation, and the water is discharged into corresponding equipment through an auxiliary liquid supply and discharge manifold 7.

When water supply is carried out, motors of all liquid supply systems are controlled and adjusted by the frequency converter, a large amount of heat generated by the frequency converter during working is cooled by the refrigeration air conditioner in the explosion-proof control chamber 5, and gas is filled into the chamber through the positive pressure gas source, so that the circulation of the gas in the chamber is accelerated, and the temperature is kept in a proper range all the time.

The automatic liquid supply and distribution system provided by the invention has the following advantages:

(1) the main liquid supply system and the auxiliary liquid supply system work together, so that the load caused by long-time work of a single machine and a single pump is avoided, and the service life of the unit is prolonged.

(2) By applying the shunt liquid supply technology, each set of liquid supply system corresponds to the respective liquid supply equipment, and the start and stop can be controlled by the automatic control system, so that the operation of manually opening and closing the valve is avoided.

(3) The control system is installed in the explosion-proof control room, and the control room is equipped with air conditioner refrigerating system and malleation ventilation air supply, can effectually initiatively dispel the heat to electrical components.

(4) The liquid adding system is in linkage fit with the main liquid supply system, the discharge capacity of the liquid adding system is adjusted along with the change of the discharge capacity of the main liquid supply system, and the volume concentration of the prepared liquid is guaranteed to be unchanged.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.