Journal of Energy Science and Technology is an international, peer-reviewed open access journal dedicated to advancing research the field of energy science and technology. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: During the cementing process, cement slurry is used to replace drilling fluid, gradually filling the entire annular space gap. At the same time, the displacement interface obtained through cement injection can intuitively reflect the displacement effect. The displacement process starts from near the center of the annular space gap and spreads to both sides. The longer the displacement interface, the insufficient displacement power will cause the phenomenon of liquid mixing and interface stop expanding, resulting in retention and delayed flow, forming a drilling fluid retention layer, It has a significant impact on the later injection and production process, so we need to improve displacement efficiency, prevent retention, and improve the efficiency of oil production. In previous research articles, most scholars mainly used flat plate flow as the research carrier to calculate and study the drilling fluid flow, local retention, and retention layer thickness in the eccentric annulus. In this paper, based on the motion equation in the cylindrical coordinate system, the retention of drilling fluid in the eccentric annulus was analyzed and studied, and a new integral constant was introduced, Establish the velocity distribution function of cement slurry or displacement fluid at the displacement interface, use iterative operation to calculate the local retention boundary, control errors, and more accurately calculate the position of the retention boundary, the thickness of the retention layer, and the influence of different factors on the thickness of the retention layer. This lays the foundation for subsequent research on the mixing relationship between pure mechanical models and fluids.Abstract: During the cementing process, cement slurry is used to replace drilling fluid, gradually filling the entire annular space gap. At the same time, the displacement interface obtained through cement injection can intuitively reflect the displacement effect. The displacement process starts from near the center of the annular space gap and spreads to bo...Learn More
Abstract: Being a kind of valuable natural resource, geothermal energy is both renewable and environmental friendly. Being a kind of widely distributed clean renewable energy source with huge reserves, geothermal resource will play an increasingly important role in energy consumption market. In recent yeas, the government has attached great importance to the development and utilization of new and renewable energy. The development of geothermal resources has important practical significance for alleviating energy stress, adjusting energy consumption structure, improving environmental quality, and accelerating the development process of cities. The urban area of Bazhou city is one of the areas with abundant geothermal resources in North China In 2007, Bazhou was successfully declared as the hometown of Hot spring in China, which will further promote the Expansion of the development scale and improvement of the utilization level of geothermal resources in this region. Geothermal team 1 has successfully constructed 3 geothermal Wells in Bazhon region and achieved good application Results. During the construction, the drilling technology and technological process of geothermal Wells were summarized by tire drilling team, hoping to provide reference and guidance for subsequent construction Wells and achieve the purpose of providing company with high-quality well bore. At the same time, it can help improve the supply capacity of clean energy, which is of great strategic significance for improving energy structure, alleviating energy shortages, protecting the ecological environment, and promoting carbon peak and carbon neutrality.Abstract: Being a kind of valuable natural resource, geothermal energy is both renewable and environmental friendly. Being a kind of widely distributed clean renewable energy source with huge reserves, geothermal resource will play an increasingly important role in energy consumption market. In recent yeas, the government has attached great importance to the...Learn More
Abstract: The vertical heterogeneity of oil reservoirs with low permeability is the most important reason that restricts the water-drive development effect, which seriously affects the recovery of oil. In order to study the impact of vertical heterogeneity on water-drive development effect of low permeability reservoirs, indoor displacement experiments were carried out by using sand-filled tubes for simulating cores with the permeability in the range of the oil reservoir with low permeability. The experiments were closely focused on the impact of vertical heterogeneity on water-drive development effect of low permeability reservoirs. By using the recovery rate evaluation device, experiments were conducted under different conditions to investigate water-drive development effect of low permeability reservoirs. The influencing laws of permeability ratio, displacement velocity, injection-production pattern on water-drive development were revealed. Experimental results indicate that the larger the permeability ratio, the earlier the water breakthrough. As the displacement velocity increases, the water breakthrough later; the recovery curve increases linearly in the initial stage, then increases slowly, and finally remains stable; as the displacement velocity increases, the recovery decreases; the recovery rate of separate injection and production is the largest, followed by combined injection and production, while the combined injection and separate production has the worst effect.Abstract: The vertical heterogeneity of oil reservoirs with low permeability is the most important reason that restricts the water-drive development effect, which seriously affects the recovery of oil. In order to study the impact of vertical heterogeneity on water-drive development effect of low permeability reservoirs, indoor displacement experiments were ...Learn More
