Study Of The Feasibility Of Geothermal Well Drilling Technology In The Cambrian In The Dongli District Of Tianjin

Geothermal resources is a green energy. Along with population growth and socialeconomy development acceleration, the demand for energy is also increasing. The useof geothermal resources has alleviated the energy shortage problem to a certain extent.The development and utilization of geothermal resources in recent years isgrowing rapidly,especially in Tianjin. With the exploitation of geothermal resources,the pressure of many geothermal reservoir decreased significantly, especially forWumishan formations. Many places even form a clear landing funnel. Based onavailable information, the exploitation of Cambrian geothermal reservoir is difficultand unstable, but it has a high capacity, low degree of development and extensiveutilization prospects. In recent years, Tianjin Geothermal Exploration andDevelopment-Designing Institute has increased the geological exploration ofCambrian geothermal reservoir. But in the construction of geothermal wells for thepurpose of Cambrian geothermal reservoir, due to the misjudgment or the complex ofthe formation, the construction often occur the phenomenon of delay period and mineaccidents seriously, which caused huge economic losses and even eventually scrappedwells.Based on previous geological and drilling data, we continue to carry outgeothermal geological survey, physical exploration, drilling and other works, whichconfirmed the Cambrian Changping group had a good geothermal reservoirconditions.As below, we take a example of geothermal well for Cambrian Changping groupgeothermal reservoir. We apply a reasonable well drilling technology and obtain theexcellent production capacity. The analysis of drilling and antihypertensiveexperiment datas further demonstrate the feasibility of geothermal well forCambrian.We can moderately increase the exploitation of Cambrian Changping groupgeothermal reservoir in the areas where Changping group developed with betterthermal storage, which could alleviate the phenomenon that geothermal reservoirpressure drops too fast. Cambrian geothermal reservoir exploration is difficult and not taken for thepurpose in the construction process of drilling and construction for many years Themain innovation of this study is that through the comparative study and drillingexample, including the well structure, the down tube and cementing, flushing andother processes,we demonstrated the possibility of Cambrian geothermal well andmade the effective well drilling technology for Cambrian stratigraphic features whichhave the certain advantages and the advanced nature of technology, but achievedproduction capacity. The study provides a basis for the further development andutilization of Cambrian geothermal reservoir in Tianjin district,also has a certainpositive significance for alleviate heat reservoir pressure drops and balance thedevelopment of geothermal resources in Tianjin.