Automatic paraffin control device for underground oil pipe and oil rod
By using superconducting heat transfer technology in oil wells, underground thermal resources are used to automatically prevent oil pipe wax grafting, solving the problems of high consumption and output impacts in the existing technology, and achieving an energy-saving and environmentally friendly automatic wax prevention effect.
Patent Information
- Application Number
- CN202411910005.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-02-11
AI Technical Summary
In the process of oil well mining, a large number of professional teams and special equipment are required to heat and clean, which consumes high heating costs and affects oil well production during the cleaning process.
Automatic wax prevention device for underground oil pipes is adopted, and the hollow core oil suction rod and tail tube in the oil well are assembled into two upper and lower heat transfer channels, and an appropriate amount of superconducting medium is installed. Through superconducting heat transfer, the heat of the deep well fluid is continuously reduced. Pass upwards to keep the oil rod and oil pipe temperature higher than the wax choke point to prevent wax choke.
It realizes an automatic wax prevention process without manual operation and no use of water and electricity, extends the well repair cycle, ensures oil well production, and saves heating costs and labor costs.
Smart Images
Figure CN119411961A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of oil well exploitation in the petroleum industry, and in particular to an automatic wax prevention technology for "hollow rod" oil wells. Background Art
[0002] Downhole oil pipes in oil fields across the country will inevitably produce wax after a period of use, affecting the normal oil production. During the oil well operation, the wax needs to be cleaned in advance.
[0003] At present, the commonly used heating cleaning method is: ① Organize multiple professional cleaning teams. Use special cleaning equipment, diesel or natural gas as fuel, heat ordinary water into hot water or steam, and clean the inner and outer walls of oil rods and oil pipes. This method requires a large number of professional teams and special equipment, and consumes considerable heating costs. ② Use a special cleaning vehicle during the oil production process to regularly add about 10m³ of hot water to the oil well for wax removal. After hot water is injected into the oil well, it not only affects the oil well production, but also requires a fee.
[0004] Situation analysis: Waxing of downhole tubing occurs when the self-produced fluid of the oil well gradually rises in the depth of the oil well during the oil production process. As the formation temperature gradually decreases from bottom to top, some wax scale forms on the inner and outer walls of the oil rods and tubing. Over time, it affects the normal operation of oil production. Summary of the invention
[0005] The purpose of the present invention is to provide an automatic wax prevention device for downhole oil pipes and oil rods, which is used for automatic wax prevention of "hollow rod" oil wells.
[0006] In the oil production process, the wax cleaning of oil rods and oil pipes is changed to preventing wax from forming on oil rods and oil pipes. The underground thermal resources are fully utilized to replace special equipment, eliminate heating costs, and do not require water or electricity. The anti-wax process does not require manual operation, and superconducting heat transfer is used to prevent wax from forming on the oil pipes. This will extend the well repair cycle and ensure oil well production.
[0007] In order to achieve the purpose of energy saving and environmental protection, the present invention provides the following technical solutions.
[0008] An environmentally friendly and energy-saving device for automatic wax prevention of downhole oil pipes is made, referred to as the automatic wax prevention device for downhole oil pipes. It is divided into two parts: the upper superconducting tube and the lower superconducting tube. The upper superconducting tube uses the original hollow sucker rod, and the lower superconducting tube is a number of tail pipes, which are connected to the oil well pipe in an orderly manner. The upper and lower superconducting tubes are filled with superconducting media to form an automatic heat transfer system to transfer the heat of the deep well fluid upward uninterruptedly. The temperature of the oil rod is increased, thereby preventing wax from forming on the inner and outer walls of the oil rod and the oil pipe, achieving the purpose of energy saving and environmental protection.
[0009] The superconducting medium is made of a variety of solid chemical substances diluted by distilled water, and is characterized in that when a certain temperature is reached, the superconducting medium changes from liquid to gas and has good thermal conductivity.
[0010] Make a vacuum tank, which consists of a tank body, a vacuum pressure gauge, a thermometer, a needle valve, and a connecting pipe. The vacuum pressure gauge, the thermometer, and the needle valve are installed on the tank body, and the tank body is connected with a connecting pipe and a hollow sucker rod.
[0011] The present invention has achieved the following technical achievements
[0012] The hollow sucker rod and tail pipe in the oil well are assembled into two upper and lower heat transfer channels. The channels are filled with an appropriate amount of superconducting medium. The upper channel is installed on the top of the oil pump. The lower channel is installed in the high-temperature well fluid below the oil pump. The superconducting medium in the heat transfer channel continuously absorbs the heat of the well fluid at the bottom of the oil well. When the temperature reaches the medium's own vaporization point, the superconducting medium changes from liquid to gas, filling the entire channel and becoming an automatic heat transfer carrier. The heat of the deep well fluid is continuously transferred upward, so that the oil rod and oil pipe of the oil well are kept within a certain temperature for a long time, achieving the purpose of wax prevention of the oil rod and oil pipe. DETAILED DESCRIPTION
[0013] Manufacture a set of automatic heat conduction device, including upper superconducting tube, lower superconducting tube, vacuum superconducting medium and vacuum tank, etc. Figure 1 . All components are installed together in order. The vacuum tank is installed on the ground where the oil well is located to form an automatic heat transfer system.
[0014] Before installing the anti-wax equipment, first investigate the following: ① the inner and outer diameters of the hollow sucker rod; ② the depth of the oil pump; ③ the depth, length and well fluid temperature of the production section of the oil well casing. Provide accurate data for the manufacture and installation of the components of the heat transfer device. Design, manufacture and install the automatic heat transfer system according to the accurate data. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments and technical solutions of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only 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.
[0016] Figure 1 , schematic elevation diagram of automatic wax prevention equipment for downhole tubing.
[0017] In the figure: 1-hollow sucker rod (upper superconducting tube), 2-oil well tubing, 3-oil well casing, 4-production section, 5-artificial well bottom, 6-vacuum valve, 7-oil pump, 8-screen pipe, 9-pump plug, 10-lower superconducting tube, 11-superconducting medium, 12-connecting pipe, 13-vacuum pressure gauge, 14-thermometer, 15-needle valve, 16-vacuum tank, 17-protection box. The steps to make and install are as follows
[0018] The first step is to use several oil pipes to form a tail pipe, add superconducting medium into the tail pipe, and then evacuate it to form a lower superconducting pipe. Connect it to the oil pipe below the oil pump.
[0019] The second step is to connect several hollow oil rods 1 together to form a hollow oil rod, add superconducting medium into it, and then evacuate it to form an upper superconducting tube.
[0020] The third step is to make a horizontal vacuum tank 16, whose pressure and volume meet the relevant national standards. Two identical vacuum pressure gauges 13, a thermometer 14, and a needle valve 15 are installed on the vacuum tank 16, and a joint is left at the bottom. A protection box 17 is made, and the vacuum tank 16 is installed in the protection box 17.
[0021] After installation, the heat of the well fluid at the bottom of the oil well is automatically transferred to the superconducting medium 11. After being heated, the temperature of the superconducting medium 11 continues to rise, changing from liquid to gas, filling the entire heat transfer channel, and forming a gaseous heat transfer carrier. The heat at the bottom of the oil well is continuously and automatically transferred upward, so that the temperature of the oil rod 1 and the oil pipe 2 is kept "higher than the waxing point" for a long time, thereby preventing the waxing phenomenon inside the oil pipe 2. The design requirements of automatic wax prevention of the oil pipe are realized. It replaces the professional cleaning team, special cleaning equipment and transportation vehicles, saving labor costs, electricity costs and heating costs. The purpose of automatic wax prevention of the downhole oil pipe is achieved. At the same time, water injection into the oil well is eliminated, ensuring the output of the oil well.
Claims
1. An automatic wax prevention device for downhole oil pipes and oil rods is a vacuum superconducting heat transfer system composed of a vacuum superconducting tube, a superconducting medium, and a vacuum inspection device.
2. According to claim 1, the vacuum superconducting tube is divided into two groups, the upper group is composed of hollow sucker rods and superconducting medium. The lower group is composed of several oil pipes and superconducting medium. The upper group is above the oil pump, and the lower group is below the oil pump. The length of the lower group is determined according to the actual well conditions.
3. According to claim 1, the superconducting medium is respectively poured into the upper and lower superconducting tubes, and the amount thereof is determined according to the volume of the superconducting tube.
4. According to claim 1, the inspection device is composed of a vacuum tank and an instrument. The vacuum tank is cylindrical, and a vacuum pressure gauge, a thermometer and a needle valve (or a stop valve) are installed on the tank body. A connecting pipe is provided on one side of the vacuum tank, and the connecting pipe is connected to the hollow oil rod. The vacuum tank is installed in a protective box.
5. The vacuum superconducting heat transfer system is composed of a superconducting tube, a superconducting medium and a testing device. The superconducting medium in the heat transfer system absorbs the heat of the well fluid deep in the oil well. When the superconducting medium reaches the vaporization temperature, it changes from liquid to gas, fills the entire heat transfer system upward, and continuously transfers heat upward, so that the temperature of the oil pipe is increased, achieving the purpose of automatic wax prevention.