Detecting cementing quality of secondary interface by using acoustic variable density logging;

The acoustic variable density logging,a main method for evaluation of cementing quality,was employed for calculation of the bonding indexes of the first and the secondary interfaces by extracting the amplitude information(or energy value) of casing waves and formation waves from variable density logging,and further for evaluation of the cementing quality.

If the secondary interface fails,a pseudo-Rayleigh signal propagates in the structural compound of the casings and cement annuluses.

Comparing data of outside casing channeling and no channeling, under condition of pressure material having no means of deriving exactness consecutive, formation temperature data plays a decisive role.

The experiments cover two types of cement-lacking-channel models,one for circular channels of different angular width,and the other for channels with gradually decreasing void channel.

Mainly discussed are cement bond logging responses to channels of flow media (e.

SBT is one of the latest and the most effective tools for checking cementing quality and its channeling.

This paper proposes isotope channeling detection log suitable to this oilfield in terms of process design and isotope carrier selection.

Surface pre-orienting drilling technology is employed for preventing wellbore from collision and channeling in CDXA Cluster Wells.

However, the quality of two-interface cementing has not been improved remarkably, because of the weak interface combination of cement, mud cakes, and formations according to the research.