No abstract

The aim of the work is to assess the possibility and usefulness of acquiring geothermal energy from the existing production well Jacho ′ wka K-2. The initial assumptions that are essential for estimation of both a heat flux transferred between a deposit and a heat carrier and a heat flux permeated through the barrier are discussed. To achieve this goal, the authors have worked out a computational model that allowed them to determine the value of the gained geothermal heat flux using a double-pipe geothermal heat exchanger with a dead center. In what follows, the results of calculations of a heat flux that can be gained in the investigated well at a depth L = 2870 m are given.Introduction. In most cases, geothermal heat plants operate in two-hole systems with injection and production wells. In such systems, the temperature of the geothermal water extracted to the earth's surface as well as the temperature of the water injected onto a deposit level may be estimated to sufficient accuracy with the help of the known computational models in a relatively simple way. When the flows of drawn-out water are great, changes in the temperature of geothermal water in injection and production conductors are relatively low. However, the high expenditure of hole drilling in comparison to the total capital cost is a negative aspect of using this method in acquiring thermal energy. Employment of a one-hole injection system may reduce the capital cost. Drilling of one hole or using existing single holes resulting from rock oil and earth gas extraction is the most effective from the economical point of view. To adapt the hole, a vertical exchanger with a double-pipe exchanger must be located in it. In this case, geothermal water is extracted with the inside pipe and injected into a deposit with a ring-shaped channel. A Double-Pipe Heat Exchanger with a Dead Center.The calculations were done on the assumption that a double-pipe heat exchanger called the Field exchanger is used to obtain the energy held in the earth. The existing casing string of the well serves as the outside frame of the exchanger. The other pipe, of a relatively smaller diameter, located concentrically, is the inside channel of the exchanger. In such an exchanger, the circulating fluid injected into the ring-shaped channel, which is formed by concentric pipes, flows down to the lower part of the exchanger and is gradually warmed up by taking heat from the rocks. At the lower dead center, the fluid reaches the maximum temperature, whose value depends on, among other things, the conditions of the heat exchange as well as the flow rate. Then the fluid flows out through the inside channel to the ground (Fig. 1). Heat exchange takes place both on the outside wall of the exchanger (between the rock and the fluid flowing through the ring-shaped channel) and between the fluid in the ring-shaped channel and the countercurrent fluid flowing through the inside channel of the exchanger.In considering the possibility of utilizing of the geothermal energy, we studied a 2870-m-lon...

No abstract

No abstract

No abstract