Research on the Structural Rigidity Characteristics of a Reconfigurable TBM Thrust Mechanism

AbstractTo improve the adaptability of TBMs in diverse geological environments, this paper proposes a reconfigurable Type-V thrust mechanism (V-TM) with rearrangeable working states, in which structural stiffness can be automatically altered during operation. Therefore, millions of configurations can be obtained, and thousands of instances of working status per configuration can be set respectively. Nonetheless, the complexity of configurations and diversity of working states contributes to further complications for the structural stiffness algorithm. This results in challenges such as difficulty calculating the payload compliance index and the environment adaptability index. To solve this problem, we use the configuration matrix to describe the relationship between propelling jacks under reconfiguration and adopt pattern vectors to describe the working state of each hydraulic cylinder. Then, both the dynamic compatible equation between propeller forces of the hydraulic cylinders and driving forces, and the kinematic harmonizing equation between the hydraulic cylinder displacements and their deformations are established. Next, we derive the stiffness analytical equation using Hooke's law and the Jacobian Matrix. The proposed approach provides an effective algorithm to support structural rigidity analysis, and lays a solid theoretical foundation for calculating the performance indexes of the V-TM. We then analyze the rigidity characteristics of typical configurations under different working states, and obtain the main factors affecting structural stiffness of the V-TM. The results show the deviation degree of structural parameters in hydraulic cylinders within the same group, and the working status of propelling jacks. Finally, our constructive conclusions contribute valuable information for matching and optimization by drawing on the factors that affect the structural rigidity of the V-TM

Reason Analysis on the Variation of Reservoir Thickness Interpretation of Different Logging Series in Sanan Development Zone

In the oilfield development process, for the geological problems, the new logging apparatus has been developed and the logging series are constantly changing. Comparing the thickness interpretation of different logging series, this paper has analyzed the variation reasons of the thickness and the effect factors of thickness interpretation such as well logging series, mud properties, formation pressure, formation fluid properties and well spacing density. This provides a more reliable parameter for calculating oil geological reserves accurately and improving reservoir evaluation.Key words: Logging series; Reservoir; Thickness division; Effective thicknes

The Method of Establishing Analogy Reservoir for Low Permeability Sandstone Reservoir

Analogy reservoir is accurate or not, related to the reliability of the SEC reserves evaluation. According to the characteristics of Jilin Oilfield low permeability sandstone reservoir, in accordance with SEC new rules and the principle of analogy reservoir establishment, we establish analogy reservoir of low permeability sandstone reservoir by taking the steps of selecting analogy reservoir, calculating geological reserves, evaluating recoverable reserves, and defining analogy recovery. With this method, we set up analogy reservoir sequence of low permeability sandstone reservoir and the sequence provides a reliable basis for SEC reserves evaluation. Key words: SEC rules; Geological reserves; Recoverable reserves; Analogy reservoir; Recovery efficienc

The Methods to Determine Oil-Bearing Area in Different Types of Reservoirs of Jilin Oilfield

Oil-bearing area is one of the key parameters to calculate geological reserves. Different reservoir types will have different methods to determine oil-bearing area. The statistical analysis of 199 proved development blocks in Jilin oilfield indicates that 92 percent of reservoirs are sandstone reservoirs and fault block oil reservoirs. Reservoir types in Jilin oilfield include lithologic reservoir, structural reservoir and structural-lithologic reservoir. According to the reservoir characteristics and regulation of petroleum reserves estimation in Jilin oilfield, the methods to determine oil-bearing area, which is suitable for different types of reservoir in Jilin, have been summed up. For simple anticlinal structural reservoir, drilling test data is used to determine the oil-water boundary. For fault block oil reservoir, the oil boundary can be composed of fault boundary, oil-water boundary and lithologic boundary. For lithologic reservoir, the lithologic reservoir boundary is determined by probability method and the oil-bearing boundary can be determined by extrapolation method, high resolution seismic or calculating line. For structural-lithologic reservoir, the determination of the oil-bearing area boundary can integrate the methods of structural reservoir and lithologic reservoir Key words: Jilin oilfield; Reservoir type; Oil-bearing area; Structural reservoir; Lithologic reservoi