Petroleum Screen Pipe: Traditional Manufacturing Methods PK Laser Processing Methods

The main role of the oil screen pipe is to prevent sand, due to the extraction of oil so that the oil wells are located in the geology, sand layer of different steel grade and type of pipe used. In oil drilling operations, screen pipe is an important equipment, often used in advance completion or oil extraction sand. At present, the more used screen pipe is wire-wound screen pipe. The manufacturing method of petroleum screen pipe is: in the uniform distribution around the screen rod or open metal liner tube wrapped around a certain cross-section of steel wire and welded, and leave a certain gap as the screen hole.

Although this manufacturing method has been used by many manufacturers in China, there are some problems with this kind of sieve pipe when it is lowered into the well, especially when it is forced to pass through the curved section of a large inclined well or a horizontal well, it is inevitable that it will collide with the wall of the well or the casing, squeeze and rub, and it is easy to have the phenomenon of "messy wire", which will result in the damage of the sieve pipe or the deformation of the slit, and thus reduce the quality of well completion and the effect of sand control. In view of this disadvantage of wireline screen pipe, cut & sew screen pipe with integrated tube and seam has appeared. Due to its superior performance and low price, the cut-and-seam screen tube has been highly valued and widely adopted by major oilfields. It can be seen that the emergence of slit screen tubing for the development of horizontal wells and sidetrack drilling wells and high sand reservoirs provide the material conditions for oil extraction.

Cut seam screen tube laser processing principle: screen tube cut seam processing is in the high-strength alloy steel pipe cut out according to a certain regular distribution of thousands of slits. Commonly used slit specifications are: slit width 0.15 ~ 3mm: slit length of 50 ~ 300mm: slit-shaped cross-section is mainly rectangular and trapezoidal. Cutting the use of focused high-density laser beam irradiation sieve tube need to be processed parts, while assisting the coaxial oxygen blowing, the laser beam energy is absorbed by the material, caused by the irradiation of the surface temperature of the material at the sharp rise in temperature, so that the tube body material melting or vaporization, and the formation of holes. When the beam and the workpiece along a certain trajectory for relative motion, it can be processed in the tube body of a certain shape of the slit.

Laser processing and traditional mechanical processing methods have many advantages compared to: ① laser cutting of the slit is narrow, the minimum width of the slit can be up to 0.1mm; ②laser cutting is a high-energy, high-density, controllable and good contactless processing, no tool wear and noise; ③ cutting efficiency is high, usually processed in 1 slit in just a dozen seconds, is dozens of times more efficient than the machining; ④ workpiece deformation is small, high precision processing, no residual round ends of the slit, and no residual round ends of the slit. No residual arcs at both ends of the seam, and the seam shape is regular: ⑤ Wide range of processing, not only can process straight rectangular seam, but also can process different specifications of trapezoidal seam, curved seam and so on.