.... Governments and independent standardization organizations have developed several regulations regarding maintaining well integrity. Nevertheless, methods of completing and operating Extreme High-Pressure-High-Temperature (XHPHT) wells as well as geothermal wells have not yet been standardized. Preserving well...

... Abstract In geothermal wells, temperature effect plays a very important role because of its high and cyclic temperature operation, usually in the range of 150 °C to 450 °C. Casing designed for traditional oil and gas production cannot be simply used in geothermal wells because...

... of drilling geothermal wells anywhere around the globe. Temperature management while drilling GT wells can be achieved by accurately determining the downhole temperature (DHT) while drilling and use of user-friendly modeling tools that allow drilling engineers to visualize and anticipate the impact...

... The work performed on the casing is calculated from the simulated forces of the drillstring, multiplied by the distance the pipe is moved on the casing via rotation or axial movement. Abstract Objectives/Scope Due to corrosive fluids being expected in the geothermal wells planned...

... ABSTRACT: This paper presents the results of numerical studies aiming to assess the effects of cement hydration on the casing integrity in superhot well conditions. Casing integrity challenges for high and super-high temperature geothermal wells were first discussed. A simplified well cement...

... Abstract Conventional hydrothermal ("low enthalpy") geothermal reservoirs are already being developed in the Netherlands as a source of heat for greenhouses, district heating. Many of these wells are left with a positive skin after being drilled, and could therefore benefit from stimulation...

... model are as follows: The geothermal system model is transient and one-dimensional, with variables solved in the axial direction. The fluid is two-phase and can be reduced to single-phase. Conductive heat transfer within the fluid flowing in the well is negligible comparing to the convective...

... will review how geothermal installations are evolving beyond traditional hydrothermal wells and how they will include closed loop systems which seek to extract heat, and not hot water or steam, from the Earth. This paper describes the various types of new geothermal systems that have been proposed with some...

... it directly affects production efficiency during the operational period. In the geothermal industry, silica deposits usually occur in water reservoirs, boilers, heat exchangers, and condensers. In the oil and gas industry, carbonate scales often occur in a wellbore, deep well pump circuits, casings, flow...

... in the near future – e.g to achieve the Dutch geothermal energy production goals of 50PJ in 2030 (EBN, 2018). Finding economic and durable solutions for sealing and well plugging would largely contribute to cost savings of abandonment activities. ARMA 21 1330 Application of Bentonite as an Alternative...

... Abstract Geothermal energy is renewable, reliable and environmentally friendly source of energy. The major cost in the development of geothermal wells is the actual drilling of the wells. The main objective of this paper is to introduce a new real-time drilling optimization system designed...

... In geothermal wells, a liner top packer is usually not run. As a result, in the liner-tieback method, the space-out between the liner and tieback is a weak point because there is no metal-to-metal seal, only cement. This is usually mitigated by keeping a longer space-out at the liner and tieback...

... on very tight budgets and geothermal exploration costs need to be kept low. Improved drilling performance has improved the viability of these projects and increased the number of exploration wells that can be drilled in a campaign by reducing the days versus depth P90 estimate, that being the 90...

... of this paper are two-fold. First, we demonstrate that DCLGS wells can generate significant geothermal power, i.e. on the order of 25-30 MWt per borehole initially. To this extent, we have developed a coupled hydraulic-thermal model, validated using oil and gas well cases, that can simulate various DCLGS well...

... (SI) downhole in the production well, is the most common method to prevent mineral scale in geothermal plants. This method although effective does not protect the near-wellbore area, where the highest pressure drop is expected. To address this issue, two methods will be studied, bullheading...

... in geothermal and high-temperature wells. The effects of high temperature on coiled tubing were considered for the job design and during the operations in the "A" field. They proved extremely useful while simulating the jobs, and post-job review of the data acquired during the operation shows a consistent, good...

... Abstract Deep geothermal energy, both hydrothermal and petrothermal, is on the advance in southern Germany. However, the prevailing differential in-situ stress field raise questions about borehole stability and EGS potential for increasingly deep wells and thus require numerical solutions...

... ABSTRACT Calcium carbonate and other mineral scales form in geothermal wells leading to reduced efficiency and sometimes well closure. Hydrochloric acid is used to dissolve carbonate scales and improve efficiency. This acid is very aggressive to the underlying metal, which is typically steel...