Development of Hydraulic Turbodrills for Deep Well Drilling

Abstract

The article discusses the possibility of improving the design of the turbine of a hydraulic drilling machine for drilling wells in very hard rocks and at considerable depths (5000–12,000 m). The analysis of the results of studies on the technical and technological characteristics of downhole drilling motors showed that it is impossible to ensure stable operation due to the limitation on the operating temperature, while with an increase in the flow rate of the drilling fluid, they do not provide the required power on the spindle shaft, and cannot reach high-speed drilling. In such conditions, turbodrills with a significant change in the profile of the stator and rotor blades and a reinforced support unit are most suitable. The paper presents an invariant mathematical model, which made it possible to determine the optimal geometric parameters based on preselected boundary conditions and the main performance characteristics of the turbine being developed. The results obtained were tested by the finite element method, which showed a convergence of 12.5%. At the same time, zones with the lowest and highest flow rates were identified. Additionally, this paper presents a comparative analysis of the obtained hydraulic turbine with turbodrills of the TSSH-178T and Neyrfor TTT 2 7/8 brands. In comparison with the domestic turbodrill, the developed turbine design shows a 13-fold reduction in its length and a 3-fold reduction in torque, provided that the maximum power is increased by 1.5 times. In comparison with the foreign analog, there is a decrease in length by 8.5 times, an increase in torque by 5 times, and in maximum power by 6.5 times.

Technology for Improving the Efficiency of Fractured Reservoir Development Using Gel-Forming Compositions

“…The developed water shut-off composition effectively reduces the permeability of water-saturated fractures (residual resistance factor is 180 units), while it is not filtered into the pore space. During the third stage, a breaker fluid is injected to destroy the gel in the wellbore (to prevent the formation of "hydraulic gates") and gel formed in oil-saturated intervals [38]. Gel destruction in oil-saturated formations can significantly increase the selectivity of the proposed method (Figure 11).…”

“…During the third stage, a breaker fluid is injected to destroy the gel in the wellbore (to prevent the formation of "hydraulic gates") and gel formed in oil-saturated intervals [38]. Gel destruction in oil-saturated formations can significantly increase the selectivity of the proposed method (Figure 11).…”

“…Further research will focus on the development of a technology for the joint use of the developed water shut-off composition and emulsion liquid packer, including the determination of the optimal composition and rheological properties [39][40][41][42][43] of the liquid packer. During the third stage, a breaker fluid is injected to destroy the gel in the wellbore (to prevent the formation of "hydraulic gates") and gel formed in oil-saturated intervals [38]. Gel destruction in oil-saturated formations can significantly increase the selectivity of the proposed method (Figure 11).…”

Assessment of the role of the state in the management of mineral resources

“…New scientific knowledge is not sufficient for the progress in this matter. The problems that many researchers deal with: the genesis of deep-seated hydrocarbons, the influence of thermodynamic processes of the Earth [32,46], technologies of deep subsurface development [47][48][49], and problems of subsurface use [50][51][52][53], are comparable with humanity's conquest of space. For example, This is an open access article under the CC BY 4.0 license drilling parametric ultra-deep boreholes requires not just large investments, but also the pooling of new knowledge and resources that are in the hands of political and financial elites.…”

Design of a New Type of Torsional Impactor and Analysis of Its Impact Performance

“…Influenced by drilling depth and rock formation characteristics, a problem will eventually arise when the bit torque is insufficient to break the formation, causing the bit to stop rotating instantaneously [2][3][4]. If the ground turntable is rotating normally when this happens, then the applied energy will be temporarily stored in the drill string, resulting in the drill string becoming twisted more and more tightly and the cutting torque being transmitted to the drill bit, causing it to become larger [5,6]. When torque is required for shearing and when the stratum breaks, then the energy of the drill string will be released instantly, causing the drill string and the drill bit to rotate violently; in other words, stick-slip vibration will occur [7][8][9].…”