CN213434202U

CN213434202U - Continuous automatic blending device for oilfield acidizing fluid

Info

Publication number: CN213434202U
Application number: CN202021038105.3U
Authority: CN
Inventors: 朱轩麟; 郝金辉; 田建龙
Original assignee: Qingyang Energy Chemical Group Longdong Acid Station Technical Service Co ltd
Current assignee: Qingyang Energy Chemical Group Longdong Acid Station Technical Service Co ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2021-06-15
Anticipated expiration: 2030-05-30

Abstract

The utility model relates to a continuous automatic blending device of oil field acidizing fluid belongs to the industrial chemicals and prepares the device and make technical field. The automatic control valve and the flowmeter in each raw material pipeline are controlled by the control cabinet to accurately measure and continuously mix, the raw materials are output by a self-priming pump arranged on the material conveying pipeline through the material conveying pipeline and enter a jet mixing pump to be continuously mixed for the second time, and then the raw materials and the solid raw materials enter a stirring tank to be fully mixed. The automatic control valve, the flowmeter and the centrifugal pump are arranged on the material conveying pipeline, so that full-automatic operation and remote monitoring can be realized, and effective metering and full mixing can be realized through automatic control. The utility model has the advantages of reasonable design, degree of automation is high, has the continuity when acidizing fluid is prepared and is mixed, and the during operation is gone on under sealed condition, has effectively avoided the excessive environmental pollution who causes that looses of acidizing fluid, also greatly reduced operating personnel inhale the health injury that probably causes such as acid mist.

Description

Continuous automatic blending device for oilfield acidizing fluid

Technical Field

The utility model relates to an equipment and technique that acidizing fluid was prepared, specifically speaking realize the continuity that acidizing fluid was thoughtlessly joined in marriage and automatic continuous automatic blending device of oil field acidizing fluid belongs to chemical raw materials and prepares device manufacturing technical field.

Background

The acidizing fluid is prepared by mixing hydrochloric acid, hydrofluoric acid, acetic acid, corrosion inhibitor, cleanup additive and the like according to the quality required by the formula proportion, and is commonly used for acidizing or fracturing construction of various oil field wells and oil wells in China. The acid liquor is utilized to perform chemical reaction with rocks, plugs, organic matters and the like, the plugs are dissolved, the stratum is dredged, a seepage passage is established, and the oil well yield and the water injection rate of the water injection well are increased. At present, the acidification liquid is prepared by metering barreled raw materials by a platform scale, sucking the barreled raw materials into a stirring tank by a self-sucking pump, manually adding the solid raw materials into a screw elevator, lifting the solid raw materials to a stirring tank hopper, starting the stirring pump, uniformly mixing, and conveying the solid raw materials into a tank car by a centrifugal pump through a pipeline. The device has simple flow, is suitable for preparing acidizing fluid with few raw material types, good solubility and low proportioning precision. The existing preparation equipment and technology have the following problems: 1. the electronic weighing apparatus is used for weighing, the barreled raw materials are fed and sucked one barrel by one barrel, the labor intensity is high, the raw material proportioning accuracy is low, the safety risk is high, and the continuity is avoided; 2. The raw materials are mixed by the stirring slurry in the stirring tank, so that the raw materials with poor solubility or large viscosity are difficult to mix; 3. The common problems of the prior acid liquor preparation are long production time, high labor intensity and low working efficiency. There is therefore a need for a continuous and automatic dispensing technique.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving present acidizing fluid preparation device simple structure, degree of automation is low, intensity of labour, inefficiency, the security is poor, and current liquid device of joining in marriage in addition can not satisfy the new requirement of current industrial production to efficiency, safety, quality of product, must develop one kind and have intensity of labour low, production efficiency is high, the safe risk is little, automatic continuous brand-new liquid technique of joining in marriage to a new technical scheme is provided.

In order to achieve the above purpose, the utility model discloses the following technical scheme of accessible realizes:

a continuous automatic blending device for oilfield acidizing fluid is characterized in that hydrochloric acid, hydrofluoric acid, acetic acid, a corrosion inhibitor and a cleanup additive are mixed according to the quality required by the formula proportion, an automatic control valve and a flow meter in each raw material pipeline are controlled by a PLC control system to accurately measure and carry out first continuous blending, and the mixture is output by a self-priming pump arranged on a first material conveying pipeline and enters a jet mixing pump through the first material conveying pipeline; the hydrochloric acid storage tank is connected with the jet flow mixing pump through a second material conveying pipeline, and an automatic control valve, a flow meter and a first centrifugal pump are arranged on the second material conveying pipeline; then the acid liquor transportation tank car is connected with the fourth material transportation pipeline, the second centrifugal pump and the fifth material transportation pipeline through the automatic control valve; a liquid level meter is arranged on the side surface of the stirring tank; a first waste gas pipeline is arranged at the top of the acid liquor transportation tank car, a waste gas pipeline is arranged at the top of the stirring tank, and the other ends of the first waste gas pipeline and the second waste gas pipeline are connected with the acid mist absorption tower; the stirring tank is provided with a feeding funnel, and solid raw materials can be added through a solid raw material lifting and adding device.

The hydrochloric acid is conveyed by a centrifugal pump, a flowmeter is arranged at an inlet, the change of the flow is converted into a control signal by an intelligent PID regulator, and an automatic control valve is controlled; the barreled raw materials of hydrofluoric acid, acetic acid, corrosion inhibitor and cleanup additive are conveyed by a self-priming pump, a flowmeter is arranged at an inlet, the change of the flow is converted into a control signal by an intelligent PID regulator, an automatic control valve is controlled, and the automatic control of metering is realized;

a material conveying pipeline for sucking each raw material is provided with a flowmeter, and a PLC control system can control an automatic control valve according to input parameters such as raw material flow and the like to ensure that various raw materials are sucked according to a set proportion; the raw material self-priming pump adopts a variable-frequency fluorine-lined electric diaphragm pump which can control the suction speed; and each control point is connected to a PLC control system for operation and control.

The solid raw material lifting and adding device lifts the solid raw material to the top of the stirring tank by the screw elevator, and the PLC control system can calculate and adjust the variable frequency screw motor to adjust the rotating speed of the screw according to the volume of the mixed raw material injected into the stirring tank, so as to control the propelling speed and the adding amount of the solid raw material, and realize that the ratio of the solid raw material and the acid liquor meets the set requirement.

The flow of each raw material is converted into a control signal by an intelligent PID regulator, and is converted into a pressure signal, a flow signal, a liquid level signal and a particle level signal which are sequentially subjected to sensor, A/D conversion and remote display by a processor.

Compared with the prior art, the utility model the advantage that has is: the automatic acid liquor preparation device has the advantages of reasonable structural design, high automation degree, continuity in acid liquor preparation, safety, reliability and environmental protection, and is operated under a sealing condition. The continuous blending equipment operates at normal temperature and normal pressure, and operators only need to convey barreled and bagged raw materials to a raw material initial position, set the proportion of various raw materials and the conveying conditions of acid liquor after simple operation, so that automatic operation can be realized. The utility model discloses fill dress and output process at the raw materials and all airtight, exhaust gas line connects to the acid mist absorption tower, and the acid mist absorption tower comprises alkali lye tower and active carbon tower two-stage, has effectively avoided the inorganization to overflow the environmental pollution who looses and cause, also greatly reduced operating personnel inhale the health injury that probably caused such as acid mist.

Drawings

Fig. 1 is a schematic diagram of the structure and flow of the device of the present invention.

FIG. 2 is a complete schematic view of the solid raw material lifting and feeding devices A and B in FIG. 1 of the present invention.

Fig. 3 is an electrical schematic diagram of the PLC control system and the controlled device in fig. 1 according to the present invention.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings in which:

the continuous automatic oil field acidifying liquid mixer is characterized by that it is formed from hydrochloric acid storage tank 5, hydrofluoric acid barreled raw material 1, acetic acid barreled raw material 2, corrosion inhibitor barreled raw material 3 and discharge-aid agent barreled raw material 4, and adopts PLC control system to mix them according to the raw material quality required by formula proportion, and adopts the processes of accurate metering, automatic feeding, continuous mixing and automatic discharging to obtain the invented acidifying liquid, and its continuous automatic mixing device is:

firstly, metering and conveying canned hydrochloric acid;

hydrochloric acid is the most main raw material in the acidizing fluid, a hydrochloric acid storage tank 5 is used for storing the hydrochloric acid, the hydrochloric acid is conveyed through an anti-corrosion first centrifugal pump 7, an automatic control valve 25 is installed at the inlet of the first centrifugal pump 7, the change of flow is conveyed to a PLC control system through a flow meter 34, the PLC control system outputs a control signal according to a flow set value, the control signal is conveyed to the automatic control valve 25, the opening of the valve is controlled, and automatic control of metering is achieved.

Metering and conveying of barreled raw materials

Hydrofluoric acid barreled raw material 1, acetic acid barreled raw material 2, corrosion inhibitor barreled raw material 3, and cleanup additive barreled raw material 4 are transported to a material suction area by a forklift and placed in a classified manner, a material suction pipeline is inserted into a barrel manually, under the condition that one raw material has a plurality of barrels, the raw material is simultaneously inserted into the barreled raw material by a series pipeline, each raw material suction pipeline is respectively provided with a flowmeter 30, a flowmeter 31, a flowmeter 32, a flowmeter 33, an automatic control valve 21, an automatic control valve 22, an automatic control valve 23 and an automatic control valve 24, a PLC control system can control the automatic control valve 21, the automatic control valve 22, the automatic control valve 23 and the automatic control valve 24 according to input flow parameters, and various raw materials are ensured to be sucked according to a set proportion. The raw material self-priming pump 6 adopts a variable-frequency fluorine-lined electric diaphragm pump which can control the suction speed. And each control point is connected to a PLC control system for operation and control.

Metering and conveying of solid raw materials

Solid raw materials are required to be added into some acid liquor, the solid raw materials are manually fed into a conveying pipeline 47 with a screw 46 through a reinforced solid feeding funnel 44 by solid raw materials lifting and feeding devices A and B, the solid raw materials are fed into the feeding funnel under the action of a screw motor 45, the advancing speed is controlled by a variable-frequency screw motor 48, and the solid raw materials are fed into a feeding funnel 18 or 19 of the stirring

tank

10 or 11 through a discharge hole 50 at a certain speed and quantity by a screw 49.

The PLC control system can calculate and adjust the variable frequency screw motor 48 according to signals of the liquid level meters 16 and 17 of the stirring tank 10 and the stirring tank 11 so as to control and calculate the adding speed of the solid raw materials, and the solid-liquid ratio can meet the set requirement.

Fourthly, mixing the raw materials

The continuous mixing device is used for solving the problems that the traditional acid liquor preparation is not uniform in mixing and cannot be continuously operated, so that the mixing and continuity of raw materials are the core of the technical scheme.

The utility model discloses a homogeneity of mixture is ensured in two steps of thoughtlessly joining in marriage: firstly, hydrochloric acid in the hydrochloric acid storage tank 5 is continuously sprayed out from a high-pressure nozzle of the jet pump 9 through a second material conveying pipeline 37, mixed raw materials of hydrofluoric acid barreled raw material 1, acetic acid barreled raw material 2, corrosion inhibitor barreled raw material 3 and cleanup additive barreled raw material 4 enter a mixing chamber of the jet pump 9 through a first material conveying pipeline 36 and a material conveying pipeline 38 under the action of the self-sucking pump 6, kinetic energy exchange occurs in the forward movement process, liquids with various viscosities and characteristics can be basically uniformly mixed, and then the mixed raw materials are injected into the stirring tank 10 and the stirring tank 11 through a third material conveying pipeline 39. Secondly, the stirring tank 10 and the stirring tank 11 are respectively provided with a stirring motor 12 and a stirring motor 13, and the motor shaft lever is provided with a stirring impeller 14 and a stirring impeller 15 which can further mix liquid and solid to fully mix the liquid and the solid. The stirring tank 10 injects and stirs, when the liquid level meter 16 reaches the high point, the automatic control valve 28 is closed, the injection is stopped, the bottom discharging automatic control valve 26 is opened, the waste gas in the acid liquor transportation tank car 20, the waste gas in the stirring tank 10 and the waste gas in the stirring tank 11 are transported to the absorption tower through the first waste gas pipeline 42 and the second waste gas pipeline 43 through the fourth material transportation pipeline 40, the second centrifugal pump 8, the flow meter 35 at the terminal and the fifth material transportation pipeline 41. Meanwhile, the automatic control valve 29 of the agitation tank 11 is opened to start the injection and agitation, and the agitation tank 10 and the agitation tank 11 cyclically perform the above operations, ensuring the continuous injection and the continuous conveyance.

Five, automatic control device

The PLC control system selects the Siemens S7-300PLC which is mature at present, the parameters of flow, pressure, liquid level, raw material switches and the like on the equipment are input and operated, a control signal is output after data processing, an automatic control valve, a flow meter, a self-priming pump, a centrifugal pump, a stirring motor and a variable frequency screw motor in the PLC control system are triggered to carry out real-time communication simultaneously, and a liquid level meter in a stirring tank is displayed to an operator through data.

The Siemens TP1900 touch control operation panel is adopted, the mass, the flow rate and the like of various raw materials can be set, and after system operation, the PLC controls the system and adjusts the opening of the automatic control valve, the flow of the self-priming pump and the centrifugal pump, the rotating speed of the variable-frequency screw motor and the like. The power supplies of the PLC control system, the self-priming pump, the centrifugal pump, the automatic control valve, the flowmeter, the variable-frequency screw motor and other equipment are provided by the power distribution cabinet.

Claims

1. The utility model provides a continuous automatic blending device of oil field acidizing fluid which characterized by: the automatic control valves (21, 22, 23, 24) and the flow meters (30, 31, 32, 33) in the raw material pipelines are controlled by the PLC control system to accurately meter and carry out first continuous mixing, and the raw material is output to a jet mixing pump (9) through a first material conveying pipeline (36) and a material conveying pipeline (38) and a self-sucking pump (6) arranged on the first material conveying pipeline (36) and the material conveying pipeline (38); the hydrochloric acid storage tank (5) is connected with the jet flow mixing pump (9) through a second material conveying pipeline (37) in a phase pipe manner, and an automatic control valve (25), a flow meter (34) and a first centrifugal pump (7) are arranged on the second material conveying pipeline (37); then the acid liquor transportation tank car (20) is connected with the material transportation pipeline (40, 41) through the automatic control valves (26, 27) and the output pipe of the second centrifugal pump (8); liquid level meters (16, 17) are arranged on the side surfaces of the stirring tanks (10, 11); a first waste gas pipeline (42) is arranged at the top of the acid liquor transportation tank car (20), a waste gas pipeline (43) is arranged at the top of the stirring tanks (10, 11), and the other ends of the first waste gas pipeline (42) and the second waste gas pipeline (43) are connected with the acid mist absorption tower; the stirring tanks (10, 11) are provided with feeding hoppers (18, 19), and solid raw materials can be added through a solid raw material lifting and adding device.

2. The continuous automatic blending device of the oilfield acidizing fluid according to claim 1, which is characterized in that: hydrochloric acid is conveyed through a first centrifugal pump (7), a flow meter (34) is arranged at an inlet, the change of the flow is converted into a control signal through an intelligent PID regulator, and an automatic control valve (25) is controlled; hydrofluoric acid, acetic acid, corrosion inhibitor and cleanup additive barreled raw materials are conveyed through a self-priming pump (6), flow meters (30, 31, 32 and 33) are arranged at inlets, the change of the flow rate is converted into control signals through an intelligent PID regulator, and automatic control valves (21, 22, 23 and 24) are controlled to realize automatic control of metering;

the first material conveying pipeline (36) for sucking each raw material is provided with a flowmeter (30, 31, 32, 33, 34, 35), and a PLC control system can control automatic control valves (21, 22, 23, 24, 25, 26, 27, 28, 29) according to input parameters such as raw material flow and the like to ensure that various raw materials are sucked according to a set proportion; the raw material self-priming pump (6) adopts a variable-frequency fluorine-lined electric diaphragm pump which can control the suction speed; and each control point is connected to a PLC control system for operation and control.

3. The continuous automatic blending device of the oilfield acidizing fluid according to claim 1, which is characterized in that: the solid raw material lifting and adding device lifts the solid raw material to the top of the stirring tanks (10, 11) by the screw elevator.

4. The continuous automatic blending device of the oilfield acidizing fluid according to claim 2, which is characterized in that: the flow rate of each raw material is converted into a control signal by an intelligent PID regulator.