Development of a High Pressure/High Temperature Down-hole Turbine Generator

Ben Plamp

关键词: AMBIENT TEMPERATURE;    AVAILABILITY;    COMMUNICATIONS;    DRILLING;    DRILLING EQUIPMENT;    DRILLING FLUIDS;    EXPLOSIONS;    LITHIUM IONS;    MAGNETS;    MWD SYSTEMS;    NATURAL GAS DEPOSITS;    POWER GENERATION;    SAFETY;    SPIN;    TURBINE BLADES;    TURBINES;   

DOI  :  10.2172/1019576
RP-ID  :  None
PID  :  OSTI ID: 1019576
Others  :  TRN: US201116%%757

美国|英语

来源: SciTech Connect

【 摘 要 】

As oil & natural gas deposits become more difficult to obtain by conventional means, wells must extend to deeper more heat-intensive environments. The technology of the drilling equipment required to reach these depths has exceeded the availability of electrical power sources needed to operate these tools. Historically, logging while drilling (LWD) and measure while drilling (MWD) devices utilized a wireline to supply power and communication from the operator to the tool. Lithium ion batteries were used in scenarios where a wireline was not an option, as it complicated operations. In current downhole applications, lithium ion battery (LIB) packs are the primary source for electrical power. LIB technology has been proven to supply reliable downhole power at temperatures up to 175 °C. Many of the deeper well s reach ambient temperatures above 200 °C, creating an environment too harsh for current LIB technology. Other downfalls of LIB technology are cost, limitations on charge cycles, disposal issues and possible safety hazards including explosions and fires. Downhole power generation can also be achieved by utilizing drilling fluid flow and converting it to rotational motion. This rotational motion can be harnessed to spin magnets around a series of windings to produce power proportional to the rpm experienced by the driven assembly. These generators are, in most instances, driven by turbine blades or moyno-based drilling fluid pumps. To date, no commercially available downhole power generators are capable of operating at ambient temperatures of 250 °C. A downhole power g enerator capable of operation in a 250 °C and 20,000 psi ambient environment will be an absolute necessity in the future. Dexter Magnetic Technologies’ High-Pressure High-Temperature (HPHT) Downhole Turbine Generator is capable of operating at 250 °C and 20, 000 psi, but has not been tested in an actual drilling application. The technology exists, but to date no company has been willing to test the tool.