It is always the key point in the field of oilfield development to study the oil circulation condition and percolation law in reservoirs.Based on the percolation theory,a three⁃dimensional percolation model is established by numerical simulation method,which can simulate the distribution of cracked joints,percolation laws,percolation thresholds of reservoir rocks and determine whether they are permeable.The results show that when the connectivity probability increases from 0,the total number of clusters increases.When the connectivity probability increases to 0.17,the total number of clusters begins to decreases.When the connectivity probability is small,the percolation probability increases slowly with the increase of the connectivity probability.When the connectivity probability exceeds the first critical value,the growth rate of the percolation probability suddenly increases.When the connectivity probability exceeds the second critical value,the percolation probability begins to slowly increase again and eventually approaches 1.The seepage cluster can accurately determine whether the porous medium is permeable and accurately capture the percolation threshold.The size of the percolation threshold is related to the size and shape of the medium.There is no obvious regularity between the maximum cluster size and the average cluster size,the maximum cluster size and the total number of clusters.It is concluded that this three⁃dimensional percolation model can simulate the long⁃range coupling mutation caused by the change of connectivity probability in porous media,which can be used to simulate the permeability and percolation law of rock.

The uniaxial compression test of deep rock in three Zhaohe area of Daqing is carried out by using the 20 ton single axis test machine. Based on laboratory experimental mechanics, rock physical parameters and contact parameters can be measured by uniaxial compression. Simulated rock samples with similar mechanical properties as laboratory experiments can be obtained by calibrating virtual parameters of discrete element software. Uniaxial compression experiments of rock samples were carried out by EDEM simulation, and stress⁃strain curves were obtained. Based on the stress⁃strain curves, the staged failure process of rock under uniaxial stress was obtained. The staged failure morphology, micro⁃fracture characteristics of force chain and the relationship between the number of bond bonds and time at different time were studied. The results show that brittle rock has no large deformation during uniaxial compression, the mode of force chain fracture is direct fracture, and no great deformation occurs. The cause of this damage may be the result of the occurrence and development of cracks in rocks.

The traditional rod pumping unit with high share and low efficiency is still dominant in the energy consumption of oilfield, thus, the accurate evaluation of rod pumping unit energy consumption is significance to guide oilfield energy saving. Based on fuzzy mathematic theory and combined with the related standard, evaluation index system of energy consumption is established. Then, rod pumping unit energy consumption fuzzy evaluation model is set up by calculating index weight and membership function. The well of Xinjiang Oilfield is chosen for example analysis. The results show that the motor is not match and out of balance. The field specialist shows that the valuation model is comprehensive and accurate.

For the problem of scaling in producing wells in Songnan gas fields, components of the scale samples were analyzed for its, and scaling experimental research was done indoor. In addition, the trend of scaling in gas wells was predict using saturated index method. Results showed that the scale in Songnan gas wells was mainly calcium carbonate. When the well producing water was fixed, the scaling quantity arised with the temperature increasing, while reduced with the pressure rising. Considering the compatibility test, it was indicted that the mainly scaling reason was the mismatch between the CaCO ₃ well killing fluid and the stratum water, which caused the decrease of pressure when the stratum water get into the wellbore. Theoretic prediction on the tendency of the scaling of CaCO ₃ was made with the OddoTomoson saturating exponential method, and the result was consistent with the measurement in field.

For the furfural extraction column of Chinese Dalian petrochemical company, the calibration on its number of theoretical plates was done by using the method of multi-stage static extraction simulation. The results show that the theoretical plate number in the column was 2 to 3 blocks. If operation conditions of the plant remained unchanged, at least four theoretical plates will be needed for the existing furfural extraction column to produce lubricating base oil meeting the quality requirement of acid value. The Pilot plant with four theoretical plates was used to verify the results. Under [KG*4]the [KG*4]operating [KG*4]conditions [KG*4]equivalent to [KG*4]that [KG*4]of [KG*4]the [KG*4]industrial [KG*4]plant, the yield of refined oil is 76%, viscosity index is 106, and acid value is 0.017 4 mg (KOH) /g, meeting quality specification of HVI400SN lubricant base oil.