Some features of drilling technology with PDC bits

Abstract

SoMe feaTureS of DrillinG TeChnoloGY wiTh PDC BiTS Purpose. Improving the technology of drilling wells with blade bits by establishing patterns of interaction in a pair of "cutter rock" to find out the causes the "hanging" blade bits over the central part of the bottom hole and develop recommendations for eliminating. Methodology. The tasks were solved by a comprehensive research method, which includes analysis and synthesis of literature and patent sources, analytical studies of existing rotary drilling models to solve the problem of "hanging" of the blade bit. findings. It has been established that the distribution of axial load on rock cutting elements depending on the distance from the center of the blade bits is extremely uneven: the incisors located on the periphery of the bit edges experience the smallest load, and the incisors located in the central part of the bit are the most stressed. originality. It was shown for the first time that the "hanging" of the bit over the central part of the face is caused by the redis tribution of axial load along the bit blades from the minimum value at the periphery of the blades to its sharp increase to the bit axis to compensate for the decrease in the path travelled by the bit in this zone. For the first time, it was proposed to perform blade bits with sharpened blades along a radius, and to destroy the resulting core with a special device. Practical value. As a result of the research, recommendations have been developed for the design of a fundamentally new design of the blade bit, which will not "hang" over the central part of the face during the drilling process. This design of the blade bit can reduce the energy intensity of drilling.

Determining key features of the operation of percussion downhole drilling machines

“…Overall, a drill well is a complex geotechnological structure that requires certain (and sometimes quite cumbersome) effective measures to maintain them in a certain working condition. Here, great attention should be paid to the needs of high rates of wellbore deepening [13]. In order to fulfil the specified criterion, it is necessary to create rational conditions for a stable flow of a rock breaking process with restrictions concerning the resource of the effective tool operation.…”

Specific features of drilling mode with extendable working elements

“…where q -specific consumption of flushing fluid per 1 mm of bit diameter, m 3 /sec * mm, q is value depends on the category of drillability, hardness and abrasiveness of rocks and varies from 1310 -5 up to 2.010 -5 m 3 /secmm [26]; d b -borehole diameter (taken equal to the outer diameter of the bit). However, since when drilling with a new bit, the amount of cuttings formed is much greater, in the formula (5) it is necessary to enter the increasing coefficient K ic :…”

Justification of drilling parameters of a typical well in the conditions of the Samskoye field

“…If the reservoir thickness is not a limiting factor, then with the same flow rate (formula (3)), the indicated ratio will be valid for the required lengths of the receiving part calculated by formula (9). The larger the diameter, the smaller the required length (line 4 of the table), with a decrease in which the costs of both the equipment of the receiving part and its repair are reduced.…”

“…As a rule, the main directions of scientific research are carried out in two main directions: solving issues related to the technology of cleaning a well from cuttings [8] and developing optimal parameters for the operation of a rock cutting tool [9].…”