The proppant extraction prediction model for hydraulically created horizon-tal fractures;

During the testing and exploitation of fractured wells,backflow of proppant often occurs and badly stings the surface flow system.

After fracturing unloading must be done, and too high unloading speed or uncontrolled open flow will make proppant backflow, so it is necessary to choose proper chokes and the amount of fracturing fluid in different stages according to the gas zone status, and to add fiber and sand in fracturing fluid to improve the operation.

Structural composition of the turning support has been described,different kinds of bearings have been simply compared,and required bearing mode has been selected preliminarily,via the analysis of external load and the calculation at different kinds of operating condition,to confirm the bearing mode which can satisfy the requirements.

Experimental Study on the Flow Conductivity of a new typed resin-coated sand proppants;

Development of a high-strength acid-resisting proppant;

Measurement and analysis of proppant sphericity and roundness;