LSAW Steel Pipe

 Characteristics and hazards of oil well casing pipe damage: Characteristics of oil well casing damage 1) Water injection well casing damage. When the casing damage occurs in a water injection well, the originally non-water-absorbing sections also begin to absorb water, causing the water-absorbing sections to increase. When the injection pressure remains unchanged, the injection volume of the water injection well will increase significantly, and when the injection volume At a certain point, the injection pressure will decrease significantly, so the corresponding indication curve for ground water injection will show that the indication curve moves to the right or downward. 2) Production well casing damage. The casing damage of production wells is mainly judged by the properties of the fluid produced by the oil well. Compared with water injection wells, it shows more characteristics. (1) The water content of oil wells increases. Before and after the casing is damaged, the moisture co...

The submerged arc welding method is one of the main production methods of welded steel pipes. Steel pipes welded by the submerged arc welding process include straight seam submerged arc welded steel pipes (LSAW steel pipes) and spiral submerged arc welded steel pipes (SSAW steel pipes). The principle of submerged arc welding: Submerged arc welding uses arc heat energy for welding. Unlike manual arc welding, the wire of submerged arc welding is exposed and has no coating on it. In submerged arc welding, the flux is laid in advance on the area to be welded. The submerged arc welding wire extends into the flux, and the arc burns under the flux. The welding wire is in contact with the workpiece and the start button is pressed. At the moment when the welding wire and the workpiece are energized, the welding wire is withdrawn, the arc ignites, the welding car moves forward, and the welding wire is continuously transported downward, maintaining the arc burning under the flux layer, and formin...

 Characteristics and hazards of oil well casing pipe damage: Characteristics of oil well casing damage 1) Water injection well casing damage. When the casing damage occurs in a water injection well, the originally non-water-absorbing sections also begin to absorb water, causing the water-absorbing sections to increase. When the injection pressure remains unchanged, the injection volume of the water injection well will increase significantly, and when the injection volume At a certain point, the injection pressure will decrease significantly, so the corresponding indication curve for ground water injection will show that the indication curve moves to the right or downward. 2) Production well casing damage. The casing damage of production wells is mainly judged by the properties of the fluid produced by the oil well. Compared with water injection wells, it shows more characteristics. (1) The water content of oil wells increases. Before and after the casing is damaged, the moisture co...

 Gas seamless pipe wall thickness standard requirements: 1. GB/T 9711.2-1999 "Steel Pipes for Oil and Gas Industry - Technical Delivery Conditions - Additional Supplementary Indicators - Welded Steel Pipes" This standard refers to the requirements for seamless pipes and welded pipes and includes the following provisions: a. The nominal wall thickness of gas transmission steel pipes should meet the design requirements. b. The outer and inner surfaces of steel pipes for gas transmission should be clean. Burrs, welding lines, pitting, defects, etc. should not be present. 2. SY/T 0413-2002 "Steel Pipes for Oil and Gas Industry" This standard is a special pipe standard for gas transportation, which has the following provisions: a. The outer diameter of straight seam electric resistance welded steel pipes for ordinary steel pipes should not be less than 8 inches (219.08mm), and the wall thickness should not be less than 9.5mm. b. The outer diameter of straight seam submer...

 Welded pipe, also known as welded steel pipe, is basically made of steel plates or steel strips that are curled and welded. The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and less equipment, but its general strength is lower than that of seamless steel pipes. Since the 1930s, with the rapid development of high-quality strip rolling production and the advancement of welding inspection technology, the quality of welds has continued to improve, the varieties and specifications of welded steel pipes have increased, and seamless steel pipes have been used in more and more fields. replaced. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the weld form. 1. Single radius forming method of welded steel pipe There are three single-radius roll forming methods: circumferential bending forming method, edge bending forming method and center bending forming...