Design And Experimental Research Of Down-hole Tools Simulation Test Bench

With the rapid development of Chinese oil drilling tools industry and the deepening of oilfield development, the difficulty of the drilling is becoming bigger and bigger. To develop and study downhole tool, it will cost more, take long time and less effective by field test. In order to develop advanced downhole tools, it’s necessary to set up the test-equipment to detect the performance of the downhole tool at simulated spot technology and working condition. We can validate the technical specifications of the downhole tools though simulated experiment, and it can help us find out the problems existing in the downhole tool’s design and processing. It’s helpful to improve the downhole tools’ design, make it perfect and also can reduce work accidents underground. So as to improve the success rate of field test.Through the analysis of the characteristics of downhole tools’actual working condition, a simulation test bench which is suitable for downhole tool have being designed. It can output a torque of 28KNm and a bit pressure of 20 tons. It can not only simulate a dip angle of 0～30 degrees and temperature of 0～125℃, can also have a stepless speed range of 0～200r/min, and has a real-time monitoring function.By analyzing the structure and working characteristics of downhole tools, and then make it as a basis for systematic research .Through the analysis from the aspects of the overall design requirements of the gantry, body, powertrain, the important parts, hydraulic control system, electrical control systems, so as to a powerful test bench for simulate downhole tools can be designed.The main body of the test bench uses a design of box girder structure which is well ensured the strength of the test bench. By optimizing the layout of the drive system, the length of the bench is effectively reduced, and increases the stability of the gantry. Through the new design of clamping device, it can be achieved for different specifications, different diameter downhole tools’ clamping, and realizes the movement of the clamping mechanism.Hoisting system and propulsion system adopt hydraulic drive, has realized the experiment rig hoisting, drop, propulsion system of the forward and backward operation. By adopting hydraulic lock and the hydraulic control one-way valve, it can make the test bench’s hoisting system and propulsion system to stop at any position during the movement, and keep self-locking. In the design of hoisting system, a support bar lifting protection is added for the safe operation of the test bench, it has added a new guarantee.The use of a relatively mature electronic control technology, the automatic and semi-automatic operation in the process of test bench in the experimental process has realized. The torque and drilling parameters such as pressure, rotating speed, temperature, angle which are imposed by the output in the process of the real-time experiment can not only be output in real time but also can be saved as EXCEL files. It’s convenient to be called and analyzed.For the well track control tool, combined with the downhole tool simulation test bench’s experiment performance, a set of theory which has a certain experimental scheme is designed by using orthogonal experiment design method. In order to save investment, the experiment process is divided into two parts, the experimental factors, levels, the response of primary and the high slope well track control tool performance test experiment. By fully considering the experiment in the experiment target, factors, level, response, experiment method, as well as logistics measures, the high slope well track control tool of testing tasks can be effectively completed.The experiment platform is accepted smoothly. The experiments prove that the test bench can finish the simulation experiments for downhole tools in different drilling pressure, torque and rotational speed and different dip angle and different formation temperature conditions. By using the downhole tools’ synchronous records on the real-time torque and drilling parameters such as pressure, rotating speed, temperature, angle in the experimental process, we can realize the analysis of the relationship between these parameters.For the adoption of mature design and control scheme in the experiment platform, its structure is reasonable, the basic function is perfect, and its system is safe and reliable.