Resonating sensor for high-pressure and high-temperature environments

A method comprising:

• measuring pressure of a fluid in a well using a double-ended tuning fork piezoelectric resonator having a first tine and a second tine, wherein:
• the first tine and the second tine are spaced apart from one another so as to form a slot between the first tine and the second tine;
• a width of the slot from the first tine to the second tine, the width of the slot measured orthogonally to lengths of the first and second tines, varies along the lengths of the first tine and the second tine;
• opposite sides of the first tine are inwardly tapered continuously toward a middle of the first tine;
• and
• opposite sides of the second tine are inwardly tapered continuously toward a middle of the second tine;
• and
• using the measured pressure to control the well.

A double-ended tuning fork piezoelectric resonator comprising:

• a first tine, wherein opposite sides of the first tine are inwardly tapered continuously toward a middle of the first tine at a first taper angle, wherein an outer edge of the first tine is tapered at a different tapering angle than an inner edge of the first tine;
• and
• a second tine, wherein:
• opposite sides of the second tine are inwardly tapered continuously toward a middle of the second tine;
• an outer edge of the first tine is tapered at a different tapering angle than an inner edge of the first tine;
• the first tine and the second tine are spaced apart from one another so as to form a slot between the first tine and the second tine;
• and
• a width of the slot from the first tine to the second tine, the width of the slot measured orthogonally to lengths of the first and second tines, varies along the lengths of the first tine and the second tine.