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Lined oil pipe

High wear resistance and light weight. The density of the anti-corrosion and wear-resistant composite lining of the oil pipe is 0.96, and the sliding friction and wear resistance is 7-8 times that of 45 # steel. The sliding friction coefficient is 1/3 of that of steel, and the wear on the matching pair is minimal. There is no need to take other anti eccentric wear measures for the pumping rod.

  • 产品描述

  • High wear resistance and light weight. The density of the anti-corrosion and wear-resistant composite lining of the oil pipe is 0.96, and the sliding friction and wear resistance is 7-8 times that of 45 # steel. The sliding friction coefficient is 1/3 of that of steel, and the wear on the matching pair is minimal. There is no need to take other anti eccentric wear measures for the pumping rod.

    1、 Introduction to the corrosion status of oil pipes

    At present, oil development is mainly focused on mechanical oil recovery with rods. As oilfield development enters the later stage, the produced fluid from oil wells exhibits high water content, high sand mixing, and high salinity. In water injection wells, the water injection medium severely corrodes the oil and casing, greatly shortening the water injection cycle; In oil wells, frequent operations are caused by eccentric wear and corrosion of oil pipes and pumping rods, greatly shortening the oil recovery cycle. Rod and pipe leakage is the main factor affecting the maintenance free period of oil wells.

    In order to solve the problem of rod and pipe corrosion, ultra-high molecular weight polyethylene (EXPE) lined oil pipes were installed in the rod pump well, which extended the Th production cycle by 400%, including all forms of failure, by 300%. Taking Shengli Oilfield as an example, after using lined oil pipes, the service life of the pipes and rods has been extended by 1-3 times, resulting in good economic and social benefits for the enterprise.

    2、 Physical characteristics and technical parameters of inner lining tubes

    1： High wear resistance and light weight. The density of the anti-corrosion and wear-resistant composite lining of the oil pipe is 0.96, and the sliding friction and wear resistance is 7-8 times that of 45 # steel. The sliding friction coefficient is 1/3 of that of steel, and the wear on the matching pair is minimal. There is no need to take other anti eccentric wear measures for the pumping rod.

    2： Good electrical insulation and strong corrosion resistance: The inner lining material has good corrosion resistance and electrical insulation, can withstand strong alkali and dilute acid corrosion, and can effectively prevent electrochemical corrosion.

    3： The anti scaling, anti wax, and anti salt effects are obvious: the inner lining material is a non-polar material that is extremely difficult to bond, so it does not scale, wax, or salt, making it an excellent anti scaling, anti wax, and anti salt oil pipe.

    4： To increase the wellhead temperature, the thermal conductivity of the lining material is 1/20 of that of steel, making it a good insulation material. Lining it into the oil pipe as a production string can effectively increase the temperature of crude oil in the wellbore, increasing the wellhead temperature by 5-10 ° C, greatly reducing the viscosity of crude oil in the wellbore and improving the efficiency of heavy oil wells.

     

     

    3. There are two working temperatures for the anti-corrosion and wear-resistant composite lining of oil pipes: A and B:

    A: Working temperature ≤ 90 ° C; B: Working temperature ≤ 130 ° C

    4. When the working temperature is ≤ 90 ° C, the material of the inner lining pipe is selected as high molecular weight polyethylene

    When the working temperature is ≤ 130 ° C, the inner lining pipe material is selected as ultra-high temperature polyamide

    4. The performance advantages of ultra-high molecular weight polyethylene (UHMWPE) lined oil pipes compared to ordinary HDPE lined oil pipes are mainly reflected in the following aspects:

    1) High temperature resistance, the former has a usage temperature about 20 ° C higher than the latter.

    2) High wear resistance, ultra-high molecular weight polyethylene is currently the best wear-resistant material among general materials; The wear resistance of the former is about 30 times that of the latter.

    3) Thin walled, using the inner lining of the former significantly reduces the wall thickness compared to the latter, which not only saves costs but also reduces the difficulty of steel plastic compliance.

    4) Elastic recovery is good, the former can make the inner lining pipe more tightly adhere to the steel pipe.

    5) Good dimensional stability

    3、 Introduction to lined oil pipe technology

    1. New oil pipe

     

     

    2. Old oil pipe

     

    Note: For old oil pipes with a wall thickness greater than 3mm and a pressure of 25MPa at the scratch site, composite lining can be used for repair.

    4、 Anti corrosion connectors for lining oil pipes

    In response to the problem of a gap in the middle of the coupling of the lined oil pipe column, our company has independently invented a corrosion-resistant connector for the lined oil pipe, which improves the design of the coupling structure by adding non-metallic sealing rings to form a complete corrosion-resistant non-metallic sealing channel for the pipe column. The anti-corrosion connector mainly consists of an extended coupling and a sealing ring. After being connected to the oil pipe, its external thread is screwed onto the sealing ring, forming a continuous sealing anti-corrosion layer on the inner wall of the pipe column, which can organize damage in the middle of the turbulent coupling and reduce fluid resistance. This anti-corrosion connector can improve the wear and corrosion resistance of the pipe column, save costs, and has broad application prospects.

     

     

    Schematic diagram of anti-corrosion connectors

    Main parameters:

     

     

    　　

    At present, our company is currently processing anti-corrosion connectors with only two specifications: 2-7/8TBG and 3-1/2TBG. Other specifications of anti-corrosion connectors can be designed according to usage requirements.

    Applicable scope

    This anti-corrosion connector is suitable for oil wells with severe wear and corrosion of oil pipes, high failure of pumping rods, injection wells with severe corrosion and scaling, wells containing corrosive gases, offshore oil wells, etc.

    Advantages of adding anti-corrosion connectors to the pipe column

    After installing anti-corrosion connectors, the pipe column will form a complete corrosion-resistant non-metallic sealing channel. The entire space in contact with the wellbore fluid is composed of non-metallic materials, which can form a complete and tight sealing channel, which is both wear-resistant and corrosion-resistant, reducing the corrosion of the metal body of the wellbore fluid coupling and the damage of the turbulent coupling. On the application surface, our company's anti-corrosion connectors can improve the wear and corrosion resistance of pipe columns, save costs, and have broad application prospects.

    5、 Product inspection report

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