Based on the variation modes of operating curves of acid fracturing treatment, and the geological effects of the treatment, 4 appraisal systems have been suggested each of which corresponds to one of the acid fracturing modes, including no fracture have been created (type Ⅰ), fractures have just been created and then stop (type Ⅱ), fracture have been created.

Optimum design of developing well network by integral fracturing the compact gas reservoir of the Jurassic Shaximiao Formation in the Xinchang gas field,Sichuan,China;

The volcanic oil reservoirs are characterized by low permeability, deep burial depth, tighter rocks, thick oil-bearing intervals and developed natural fracture and solution pores, and which have some difficulties such as high temperature of reservoir, high pumping pressure, high fluid loss, high fracture initiation gradient and high rate of sand up while fracturing.

Analysis on upgrading of Lijiaxia-Qunke line from 35kV to 110kV;

This upgrading by compact type design may he an effective way to solve the problems of shortage of capital resources and the urgent needs of strengthening 1 10 kV network construction.

This article illustrates the ways and means to static pressure reformation to dynamicstatic pressure bearings in double-shoe sliding bearings cement mills and their oil supplying systems,and also explains the maintenance principles after reformation.