It makse Yangtian CXQ3090 brand special dump trucks as an example, emphasize the changing rule between oil jar pushing force and lifting angle, and draw two pictures on f(θ) and g(θ) through Matlab program.

The calculation of maximum lifting angles of dump trucks should guaranting freights being unloaded completely and no interfering between bodies and chassises.

But in the production process,the scaling of lifting system can lead to the pump stucking,the rod parting increasing and the pump inspection interval shorting,which has affected the production percentage and oil displacement effect seriously.

As for the current problems existed in the lifting technology in Lu Kewin oilfield, the study on rheological characteristic and viscosity-temperature characteristics of heavy oil was conducted.

With the application of PCS intelligence plunger lift technique,the gas wells renew their production without any additional power.

There often exist dangers when a tipper is lifting body or riding.

The corresponding measure was produced according to characteristic of heavy dump truck that length is larger,and it has certain directive function for design of lifting system of heavy dump truck.

With previous successful experiences in lifting tanks with different sizes,the authors put forward an integral lifting scheme for a 50000 m3 floating roof oil storage tank.

Using the successful experiences of oil tank integral lifting in rece nt years for reference, the schemes of integral lifting for a 5×104 floating r oof tank are worked out, and through the verification calculations of stability and strength, the optimum scheme is determined.