Erosion in the nozzle inlet end face wear play a major role

From the nozzle wear mechanisms and effects of two parts for rotary drilling abrasive jet conducted exploratory research. Through  polycrystalline diamond  analysis, the rotating abrasive jet nozzle wear plays a decisive role in the abrasive wear and erosion. Where  cutting tools  is the main form of the nozzle inner wear, and erosion in the nozzle inlet end face wear plays a major role, and were the two wear mechanisms were discussed.  synthetic diamond  method analysis of the stress state in the nozzle. The results showed that: the maximum stress in the nozzle cone section at the beginning of the end of the straight section, the stress cone section is smaller and showed an increasing trend, the average stress is greater than the straight section cone section, in addition to the entrance face of stress as well.

Rotating water jet diffusion angle measured experimental analysis of all relevant parameters on the jet spread angle of the law

Combined rotary abrasive jet casing window casing window mechanism and a set of practical requirements designed impeller, nozzle suitable for indoor as well as experimental research tools, and its strength check. Checking results show that the designed tools to meet the requirements. By  abrasive wheels  jet diffusion angle measured  synthetic diamond  analysis of all relevant parameters on the jet spread angle is studied. The experimental results showed that: rotating water jet pump is larger in the diffusion angle does not vary with the pump pressure is changed, the proliferation of  cutting tools  with water jet nozzle diameter, the impeller blade outlet angle and the number increases. By rotating the casing window abrasive jet experimental analysis of all relevant parameters on the effect of regular windows and preferably out of the relevant parameters.

Small screw motor driven mechanical gimbal drive alloy drill fenestration

In a variety of technology to improve oil recovery, the radial horizontal well technology with its operating procedures are simple, the process cycle is short, less investment, etc. showed good technical and  abrasive grinding . Applications at home and abroad to open a small window radius horizontal well technology uses small screw driver alloy  synthetic diamond  driven mechanical drill fenestration, because underground space constraints, the level of domestic screw motor technology is difficult to meet the requirements. To this end we introduce rotating abrasive jet  cutting tools , and its realization casing window, expand the relevant theoretical analysis and experimental research tools designed to promote open small window radial level technology application in China.

Based abrasive water jet cutting efficiency and high rotating jet good scalability characteristics

The traditional radial drilling technology requires forging mill and a large diameter casing reaming, operating procedures and more difficult construction. Casing window radial horizontal well technology simply open the casing with a diameter of about 30 mm of the window, to the formation of radial drilling channels. At present, foreign multi-use mechanical window. Based abrasive water jet cutting efficiency and high rotating jet good scalability characteristics, the author proposes a  synthetic diamond  jet technology line window, and through numerical simulation and laboratory tests to analyze the combination of means for the further development and improvement of open  Polycrystalline diamond  technique provides a theoretical basis. Injury and damage criterion variable in metallic materials RVE, assuming a  Abrasive grinding  area A normal vector is n, the micro-cracks or micro-voids exist, resulting in an effective bearing area A Zhou ratio A small, that Zhou A = A-AD. AD is considering stress concentration defects and defect area after interaction. In the assumption of isotropy of the premise, the damage variable defined as a defect area and the total area ratio, i.e. D = ADA = A-Zhou AA. (2) when D = 0, the metal material is non-destructive condition; D = 1 , the metal material is completely broken;

Combination of different impeller nozzle to simulate structural characteristics and results rotating jets of various factors

The newly developed rotary abrasive jet casing window tool, using numerical simulation method, the tools to optimize the structure and size of the design . Rotate tool abrasive jet casing window is the core component of the jet nozzle and rotating impeller . From the nozzle and impeller geometry and basic characterization can be seen, leaf number, as well as export-oriented angle nozzle diameter and other parameters that affect the efficiency of rotating abrasive jet major factor . Numerical method, the combination of different impeller nozzle simulation results and the structural  Diamond blade  of rotating jets of various  synthetic diamond  jet spread angle of rotation rule ; through the individual abrasive particle erosion simulation casing , the casing draw stress , strain change process , abrasive particles displacement, velocity change process , as well as the depth of various factors on the impact of erosion pits law ; abrasive jet by  abrasive grinding  window full-size simulation tool , draw nozzle phase fluids inside and outside the field distribution of the casing and a rotating abrasive jet erosion damage process . Finally, the structural parameters of the impeller nozzle size optimization , preferably windows meet the requirements of the impeller and the nozzle , and the simulation and experimental results are compared to verify the accuracy of the simulation results .

Abrasive jet cutting subsea wellhead operating efficiency, to carry out the relevant theoretical and experimental

Demolition work in the offshore oil platform, the abandoned wellhead underwater cutting is one of the most important and most expensive one engineering work. Multilayer casing abrasive jet cutting technology has abandoned wellhead safety, environmental protection advantages. But conventional abrasive jet cutting tool cutting subsea wellhead, due to the ever-increasing standoff distance reduces the cutting efficiency. To improve the abrasive jet cutting subsea wellhead operating efficiency, to carry out the relevant theoretical and experimental studies. The first systematic study using  Diamond blade  of various parameters on the abrasive jet cutting efficiency. The results showed that: the depth of the abrasive jet cutting  cutting tools  pump pressure, nozzle diameter, the number of nozzles, cutting the time increases, as the target distance decreases; with the increase of the cutting speed of the cutting head casing depth first increases and then decreases, the optimal  grinding wheel l 7.895r/min; with the abrasive concentration increases, the cutting depth along first and then decreases, experimental optimum abrasive mass concentration value of 26.10%; abrasive abrasive jet cutting depth in descending order of iron ore, emery, garnet, quartz sand.

Abrasive water jet cutting metal materials physics

Abrasive jet cutting is not subject to the cutting position and the eccentric bushing restrictions, thus becoming obsolete wellhead and riser removal and effective means. Based on the theoretical analysis of cavity expansion abrasive jet cutting metal materials physical process, the establishment of a single abrasive particle  synthetic diamond powder  depth calculation model, obtained the higher jet pressure, the use of high density and with a sharp angular abrasive can significantly improve the cutting efficiency of the law, as the construction work is  synthetic diamond  category provides a theoretical basis. Were submerged jet under pressure, nozzle diameter, number of nozzles, cutting head speed, cutting duration, standoff distance, abrasive quality copies, abrasive type on cutting depth effect.