Automatic cleaning method for heat accumulating type closed oil pipe

Abstract

The invention discloses an automatic cleaning method for a heat accumulating type closed oil pipe. Materials are placed in a pipe cleaning groove; cleaning the materials; after cleaning is finished, the materials are hoisted to a drying position; the heat storage system is used for heating and maintaining the temperature of a medium in the pipe washing groove; the temperature of the medium in the pipe washing groove is displayed online in real time, and according to the temperature condition of the medium in the pipe washing groove, when the medium in the pipe washing groove meets the cleaning temperature requirement, a heating coil of the heat storage system is closed; vOCs in the pipe washing groove are collected by a fan through negative pressure and sent to a VOCs treatment device; and after being dried, the materials are conveyed to a cleaned material rack. Clean energy is adopted to replace traditional natural gas heating in a heat storage mode, and zero emission of carbon dioxide is achieved; the environment-friendly hidden danger that VOCs overflow in the cooking process of materials attached with oil stains is solved, and standard treatment and discharge can be realized; conveying of materials is achieved, and the labor intensity and potential safety hazards of field workers are reduced; and the problem of freezing of the cleaned materials in cold weather is solved through a drying process.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical industry, and in particular to an automatic cleaning method for a heat storage type sealed oil pipe. Background Art

[0002] Oil pipes, sucker rods, insulated oil pipes, etc. are used in oil well operations. These oil pipes and oil rods will be covered with oil and dirt during the operation process, which will affect the next use. Therefore, the cleaning process of oil pipes and oil rods is introduced in the production process. The current mainstream process technologies for oil pipe cleaning are physical cleaning and chemical cleaning. Physical cleaning mainly removes dirt on the surface of the oil pipe by physical means, such as mechanical friction cleaning, high-pressure water jet cleaning, heating cleaning, etc. Among them, common heating cleaning methods include steam car cleaning, hot boiling pool cleaning, medium and high frequency heating cleaning, etc. Chemical cleaning mainly uses chemicals / solvents to remove dirt from the oil pipe, that is, adding cleaning agents to hot water for soaking. Oil fields have long used open boiling pots for hot immersion chemical cleaning, but this method has environmental and safety risks.

[0003] In recent years, various oil fields have gradually replaced the original open boilers with closed automatic cleaning equipment to solve the environmental risks of VOCs emissions. This equipment mainly uses heat medium to steam the oil pipes and oil rods and then conducts mechanical friction cleaning. This cleaning method has disadvantages such as scratching the metal surface of the pipes, accelerating the corrosion rate and reducing their service life. In addition, the steaming heat of the oil pipes and oil rods in the cleaning process comes from the combustion of natural gas, which has a certain amount of carbon dioxide emissions. In addition, the closed cleaning equipment needs to limit the length of the oil pipes and oil rods. Extra-long and extra-short pipes and rods cannot be cleaned using this equipment. Moreover, in low-temperature areas, during winter cleaning operations, the cleaned oil pipes, oil rods and other materials are prone to freezing. Summary of the invention

[0004] The present invention provides a heat storage type closed oil pipe automatic cleaning method to solve the safety hazards of falling from a high altitude, slipping and falling during cleaning of an open boiling pot, and the environmental hazard of VOCs gas volatilized by floating oil under high-temperature cooking, and to reduce the labor intensity of operators to a certain extent; solve the problem that ultra-short tubes in the material cannot be automatically cleaned; solve the problem that the material freezes after cleaning during cleaning operations in low-temperature areas in winter.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a heat storage type closed oil pipe automatic cleaning method, comprising the following steps:

[0006] a. Place the material in the pipe washing tank;

[0007] b. Cleaning materials;

[0008] c. After cleaning, lift the material to the drying place;

[0009] d. Heat and maintain the temperature of the medium inside the pipe washing tank through the heat storage system;

[0010] e. The temperature of the medium in the pipe washing tank is displayed online in real time. When the medium in the pipe washing tank meets the cleaning temperature requirements, the heating coil of the heat storage system is turned off;

[0011] f. The fan collects VOCs inside the pipe washing tank through negative pressure and sends them to the VOCs treatment device;

[0012] g. After the material is dried, it is sent to the cleaned material rack.

[0013] Furthermore, in step a, the material is placed in a basket and the crane is started through the control panel to lift the basket above the pipe washing trough. When the basket is directly above the pipe washing trough, the automatic door on the top of the pipe washing trough is opened, and the crane places the basket on the support frame of the pipe washing trough. The crane hoist returns to the top of the pipe washing trough, and the top door of the pipe washing trough is closed.

[0014] Furthermore, in step b, the cleaning time is set according to the amount of oil stains attached to the surface of the material, and the material is cleaned.

[0015] Furthermore, in step b, a cleaning agent is added according to the composition of the oil stains attached to the surface of the material.

[0016] Furthermore, in step c, after cleaning is completed, the top door of the pipe washing tank is opened, the crane is started to lift the basket out, the top door of the pipe washing tank is closed, the basket is lifted onto the drying rack, the material is moved from the basket to the drying hot air area, and the crane carries the basket back to the material to be washed, ready to enter the next work process.

[0017] Furthermore, in step d, the heat storage system uses the electric energy during the off-peak period at night as energy, heats the medium in the water tank through the electric heating element, and transports the medium in the water tank to the pipe washing tank heating coil through the pipeline to complete the medium temperature maintenance during the cleaning operation.

[0018] Furthermore, in step a, the medium in the pipe washing tank comes from the water storage tank in the thermal storage system, and the water in the water storage tank uses the electricity during the low-peak period at night as energy.

[0019] Furthermore, in step f, the VOCs device uses condensation + adsorption to complete VOCs treatment.

[0020] Furthermore, in step g, the heat from the condensation heat exchange of the VOCs treatment part is used to heat the air, and the material is purged by a blower; this part is also equipped with an electric heating device to heat the air, mainly to deal with the situation in winter or when the ambient temperature is low, when the cleaned materials are prone to freezing.

[0021] Beneficial effects of the present invention:

[0022] (1) Clean energy is used to store heat instead of traditional natural gas heating, achieving zero carbon dioxide emissions.

[0023] (2) It solves the environmental hazard of VOCs overflow during the cooking process of materials with oily stains, and can achieve standard treatment and discharge.

[0024] (3) Realize the transportation of materials, reducing the labor intensity and safety hazards of on-site workers.

[0025] (4) Solve the problem of freezing of materials after cleaning in cold weather through drying process.

[0026] (5) It can realize the cleaning of ultra-short pipes, improve the utilization rate of oil pipes, and can also meet the cleaning needs of irregularly shaped materials.

[0027] (6) It can be promoted and utilized in various oilfield operating areas to achieve centralized cleaning of different types of materials to meet operational needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the attached Figure 1 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] A heat storage type sealed oil pipe automatic cleaning method comprises the following steps:

[0035] a. Place the material in the pipe washing tank. Place the material in the basket and start the crane through the control panel to lift the basket above the pipe washing tank. When the basket is directly above the pipe washing tank, open the automatic door on the top of the pipe washing tank. The crane places the basket on the support frame of the pipe washing tank. The crane hoist returns to the top of the pipe washing tank and closes the top door of the pipe washing tank. The medium in the pipe washing tank comes from the water storage tank in the thermal storage system. The water in the water storage tank uses the electricity during the low-peak period at night as energy.

[0036] b. Clean the material. Set the cleaning time according to the oil stains on the material surface and clean the material. Add cleaning agent according to the composition of the oil stains on the material surface.

[0037] c. After cleaning, lift the material to the drying area. After cleaning, open the top door of the pipe washing tank, start the crane to lift the basket out, close the top door of the pipe washing tank, lift the basket to the drying rack, move the material from the basket to the drying hot air area, and the crane returns the basket to the material to be washed, ready to enter the next work process.

[0038] d. Heat and maintain the temperature of the medium inside the pipe washing tank through the heat storage system. The heat storage system uses the electric energy during the low-peak period at night as energy, heats the medium in the water tank through the electric heating element, and transports the medium in the water tank to the heating coil of the pipe washing tank through the pipeline to complete the medium temperature maintenance during the cleaning operation.

[0039] e. The medium temperature in the pipe washing tank is displayed online in real time. According to the medium temperature in the pipe washing tank, when the medium in the pipe washing tank meets the cleaning temperature requirements, the heating coil of the heat storage system is turned off.

[0040] f. The fan collects VOCs inside the pipe washing tank through negative pressure and sends them to the VOCs treatment device. The VOCs device uses condensation + adsorption to complete VOCs treatment.

[0041] g. After the material is dried, it is sent to the cleaned material rack. The heat from the condensation heat exchange of the VOCs treatment part is used to heat the air, and the material is blown through the blower; this part is also equipped with an electric heating device to heat the air, mainly to deal with the situation in winter or when the ambient temperature is low, when the cleaned material is easy to freeze.

[0042] (1) Cleaning equipment

[0043] This equipment uses thermochemical cleaning technology. The main body adopts a rectangular pipe washing tank. The top of the pipe washing tank is equipped with an automatic door to prevent heat loss and VOCs overflow. A heating coil is installed inside the pipe washing tank to heat and maintain the temperature of the medium in the tank; and a support structure is provided to support the materials to be cleaned. VOCs collection devices are installed on both sides of the pipe washing tank. A high-pressure water nozzle for dredging is installed in the middle and lower part of the side wall of the pipe washing tank, which is used to regularly clean the sludge at the bottom of the pipe washing tank. A sludge collection tank is provided at the bottom of the pipe washing tank.

[0044] (2) Material conveying part

[0045] The material conveying part mainly adopts a crane with a sling. The material is loaded into a basket, and the basket is raised and lowered by controlling the power on and off of the sling, and then delivered to the designated location as required.

[0046] (3) Heat storage part

[0047] This part is mainly responsible for heating and maintaining the temperature of the medium inside the pipe washing tank. It mainly includes water tanks, electric heating elements, etc. The electric energy during the low-peak period at night is used as energy, the medium in the water tank is heated by the electric heating element, and the medium in the water tank is transported to the heating coil of the pipe washing tank through pipelines to complete the temperature maintenance of the medium during the cleaning operation.

[0048] (4) VOCs collection and treatment

[0049] This part mainly includes fans, chimneys, detection devices, treatment devices, etc. The fans collect VOCs inside the pipe washing tank through negative pressure and send them to the VOCs treatment device, which uses condensation + adsorption to complete VOCs treatment.

[0050] (5) Automatic control part

[0051] This equipment is equipped with a control cabinet with a built-in PLC controller, and the cabinet is inlaid with a LCD display and self-reset operation buttons.

[0052] The display screen animation simulates the movement of each part of the equipment in real time, displays the temperature of the pipe washing tank, the status of the VOCs treatment device, and the fault pop-up alarm. The PLC controller is connected to the operation buttons, crane control circuit and spreader controller respectively, and the operator controls the equipment. The functions of each operation button are as follows:

[0053] ·Pipe washing: The crane is equipped with an electronic crane scale, and the weighing data is wirelessly transmitted to the PLC controller. When the basket load exceeds the load capacity of the spreader, the pipe washing operation cannot be started. The spreader moves to the top of the basket, descends and lifts the basket, rises and moves to the top of the pipe washing tank, the automatic door of the pipe washing tank opens, the spreader descends to the designated position and releases to place the basket in the pipe washing tank, the spreader rises to the top of the pipe washing tank, and the automatic door closes.

[0054] Drying: The automatic door of the pipe washing tank opens, the hoist goes down into the pipe washing tank, the hoist lifts the basket, sends the material to the drying area, and the automatic door of the pipe washing tank closes.

[0055] Temperature maintenance: Heat and maintain the temperature of the medium in the pipe washing tank, and display the medium temperature.

[0056] · Turn off temperature maintenance: Turn off the pipe washing tank heating system.

[0057] Emergency stop: Turn off the power supply of the equipment after the crane and the spreader return to their initial positions.

[0058] (6) Drying part

[0059] The materials cleaned in the pipe washing tank are moved from the basket to the drying rack, and the heat from the condensation heat exchange of the VOCs treatment part is used to heat the air, and the materials are purged by the blower; this part is also equipped with an electric heating device to heat the air, mainly to deal with the situation in winter or when the ambient temperature is low, when the cleaned materials are prone to freezing.

[0060] The above-described embodiments are only preferred embodiments of the present invention, and are not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made to it without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention. Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and the components thereof can be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the various features in the embodiments disclosed in the present invention can be used in combination with each other in any way, and the fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A heat storage type closed oil pipe automatic cleaning method, It is characterized in that The following steps are involved: a. Place the material in the pipe washing tank; b. Cleaning materials; c. After cleaning, lift the material to the drying place; d. Heat and maintain the temperature of the medium inside the pipe washing tank through the heat storage system; e. The temperature of the medium in the pipe washing tank is displayed online in real time. When the medium in the pipe washing tank meets the cleaning temperature requirements, the heating coil of the heat storage system is turned off; f. The fan collects VOCs inside the pipe washing tank through negative pressure and sends them to the VOCs treatment device; g. After the material is dried, it is sent to the cleaned material rack.

2. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the above step a, the material is placed in a basket and the crane is started through the control panel to lift the basket above the pipe washing tank. When the basket is directly above the pipe washing tank, the automatic door on the top of the pipe washing tank is opened, and the crane places the basket on the support frame of the pipe washing tank. The crane hoist returns to the top of the pipe washing tank, and the top door of the pipe washing tank is closed.

3. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the step b, the cleaning time is set according to the oil stains attached to the surface of the material, and the material is cleaned.

4. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the above step b, a cleaning agent is added according to the composition of the oil stains attached to the surface of the material.

5. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the above step c, after cleaning, the top door of the pipe washing tank is opened, the crane is started to lift the basket out, the top door of the pipe washing tank is closed, the basket is lifted onto the drying rack, the material is moved from the basket to the drying hot air area, and the crane carries the basket back to the material to be washed, ready to enter the next work process.

6. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the step d, the heat storage system uses the electric energy during the low-peak period at night as energy, heats the medium in the water tank through the electric heating element, and transports the medium in the water tank to the pipe washing tank heating coil through the pipeline to complete the medium temperature maintenance when the cleaning operation is completed.

7. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the step a, the medium in the pipe washing tank comes from the water storage tank in the heat storage system, and the water in the water storage tank uses the electric energy during the low-peak period at night as energy.

8. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the step f, the VOCs device uses condensation + adsorption to complete VOCs treatment.

9. The automatic cleaning method of the heat storage type sealed oil pipe according to claim 1, It is characterized in that In the above step g, the heat from the condensation heat exchange of the VOCs treatment part is used to heat the air, and the material is purged by a blower; this part is also equipped with an electric heating device to heat the air, mainly to deal with the situation in winter or when the ambient temperature is low, when the cleaned material is prone to freezing.

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