A method for periodicity determinant and period extraction of space targets was proposed based on the lightness characteristics.

Dynamic prediction model of bailing production test and application in reserves evaluation;

A novel pitch tracking method based on FFT-ACF and estimation of pitch candidates;

To reduce the halving and the doubling errors in pitch tracking,an algorithm based on a combined magnitude difference function is proposed in this paper.

For the bailing exploitation,it's necessary to shut in well for resuming the liquid level,while the wellbore gets the quantificational oil,then it's beginning to bailing for the next time.

Although bailing exploitation is more suitable for the exploitation of low output oil wells drilled newly or distributed dispersively,which can reduce investment and cost to a great extent and raise economic profit,it does not mean that all of the low output and low profit oil wells or low output oil wells without profit gain economic profit after turning into bailing.