Due to the transition of a large number of Russian hydrocarbon fields to the late stages of development, oil reserves produced in such fields are considered hard-to-recover. To extract such reserves, complex multi-interval profiles are designed, the wiring of which must be controlled directly during the drilling. This issue is solved using telemetric wellbore monitoring systems, which are also being developed in Russia. Such the drilling technique requires a high-speed data exchange between the wellhead and the bottom of a well. The data must go to the ground equipment and to the dispatcher in real time. In most cases a hydraulic data link is used for data transmission which has a number of speed and volume restrictions. Companies developing telemetry equipment and its software are trying to increase the speed and volume of data transfer between the wellhead and the bottom by using new sensors, transmitters, encryption and decryption systems, as well as other related equipment. In this case, it becomes necessary to adjust and refine the results obtained. To carry out such studies at the design and debugging stage, before running into the well, the test bench is being developed in the Perm National Research Polytechnic University to imitate a hydraulic data link during well construction.
Simulation of the hydraulic data link is as follows: the data link medium is emulated through the hydraulic channel by generating rectangular pulses of standard amplitude of a certain frequency. The parameters of the pulses are then changed in such a way as the real transmission medium - a well with drilling fluid (operation of a bit, pumps, column rotation etc.) - before they are fixed by the pressure sensor of the receiving device. The developed test bench is portable and can be used both in laboratory conditions and directly in the production of telemetry systems for testing them before shipment to the customer. Simulate a hydraulic data link during well construction at the stage of development and configuration of telemetry equipment will allow developing a complex signal recognition and decoding algorithm for more accurate transmission of information from the downhole telemetry system to the wellhead. That, in turn, will increase the quality of the incoming information and, consequently, the accuracy of the posting on a complex profile.
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