Seamless Steel Pipe

 The seamless steel casing pipes are directly connected by threads, and the male end is connected to the female end. When connecting, the reliable performance of the sealing of the casing thread position is a key factor to ensure the normal production of the oil well. The sealing structure of the new type of threaded oil casing is sealed by metal-to-metal contact, and there will be no gap problem, so it has a very reliable sealing performance; special threaded oil casing has been used in industrial equipment for a large area The use, especially in high-pressure oil and gas wells. However, these emerging threaded casings have very strict requirements for tightening torque. Under normal circumstances, there are three values: maximum torque, optimal torque and minimum torque. The three values of different threaded oil casings are also different. The range between the maximum torque and the minimum torque of some special threads is very small. In the actual oil casing operation, the ti...

 　　There are many standards for selecting oil casing manufacturers, which can be divided into short-term standards and long-term standards according to the length of time. The short-term standards for selecting oil casing manufacturers mainly include product quality, price level, timely delivery and overall service level. 　　1. Product quality 　　The quality of the purchased oil casing meets the requirements of the purchasing unit is a condition that the purchasing unit must consider when purchasing the oil casing. Poor quality and low price casing products have lower procurement costs, but will lead to an increase in the total cost, but if the quality is too high, it will far exceed the production requirements, which is also a waste. Therefore, the quality requirements of the oil casing in the procurement The production needs of the enterprise must be consistent, and the requirements are too high or too low are not appropriate. 　　2. Lower cost 　　A lower purchase price is an importan...

 　　According to the different requirements of the production process of the oil casing pipe, the length measurement system of the oil casing also has a variety of measurement methods. Let us look at the basic three measurement methods. 　　1. Length measurement with grating ruler 　　The basic principle is to install two fixed-length grating rulers on the outer side of the oil casing pipe. The rod-shaped cylinder is used to drive the grating rulers near the two ends of the oil casing pipe. The length of the oil casing pipe is measured by the phenomenon of light interference. 　　It has the characteristics of high precision. However, grating rulers are expensive, difficult to maintain, and sensitive to dust and site vibration. 　　2. Camera length measurement 　　Camera length measurement is achieved through image processing. The principle is to install a series of equidistant photoelectric switches on one section of the oil casing conveying roller, and add a light source and a camera on the ...

    Thread parameter parameters limit the anti-sticking performance of oil casing pipe to a great extent. Reasonable control of the thread parameters can fully improve the anti-sticking performance of petroleum casing. In the use and production process of petroleum casing, the adhesion of petroleum casing depends to a large extent on the actual operating specifications. From a certain point of view, the effect is not less than the rigid requirements of petroleum casing.     1. The friction resistance of the threaded port of the API thread compound can be rotated to make the API opening greatly reduced. Generally, it is no problem to reduce it to 0.021. The API thread compound allows sufficient lubrication of the screw, the friction is reduced to a greater extent, and its abrasion resistance is greatly increased to a certain extent.     2. Increase the deduction speed. From the theory of adhesive wear, it can be seen that when the thread is connected, w...

    Various impurities can be reduced into the production layer: after acidifying the conventional oil casing pipe, the wax, rust residue and adherent instruments in the pipe will be brought to the formation. If we acidify the thickened tubing to the outside, magazines such as scaling, waxing, and rust residue in the tubing can be removed to reduce the pollution of the tubing to the formation during construction.     To avoid secondary pollution to the oil layer when performing well killing operations: One of the effective methods to improve oil production fluids is to quickly clean the formation. The reason is that after the formation is treated with acid solution, precipitation and liquid leakage will occur. The outer thickened tubing can be used to easily replace the formation with nitrogen, and the outer thickened tubing can be lifted out of the wellhead without well killing. Because the outer thickened oil pipe is a relatively closed loop system, the staff can...

　　With the development of oil well gas drilling operations to more severe working conditions such as deeper, higher pressure and higher temperature, and the continuous improvement of oil drilling technology, conventional oil casing pipe threads are difficult to meet the development needs of oil fields. 　　At present, there are more and more high-pressure oil and gas wells. The ordinary API threaded tubing can not meet the requirements of high-pressure sealing. For oil and gas wells with pressure higher than 28MPa, most of them choose gas-tight special buckle type tubing. As more and more H2S/CO2/Cl- containing oil and gas wells will be put into development, ordinary low-carbon low-alloy steel tubing cannot adapt to harsh corrosive environments, and the service life of tubing cannot meet the design requirements of oil and gas wells, so 9Cr, 13Cr. The application of corrosion-resistant material tubing such as 22Cr and 25Cr is also becoming more and more extensive.

　　Oil casing pipes, also known as production casings. It is the last layer of casing in the oil and gas well casing process, from the wellhead down to below the oil and gas layer. 　　The depth of the casing casing is basically the depth of the well. 　　The function of the oil casing is the passage of oil and gas to the ground, which isolates the oil and gas from the entire formation to ensure that the oil and gas pressure does not leak. After the oil and gas wells are transferred into production, the quality of the oil casings must be guaranteed to maintain a certain number of years of exploitation. 　　The cementing quality of the oil casing is related to the exploration well, which is the key to oil and gas testing. On the other hand, it is related to the production well, which directly affects the life of the well.The cement sealing height between the oil casing and the borehole wall is at least 500 m above the oil and gas layer or 200 m above the upper casing. 　　The main differ...