In recent years, horizontal well fracturing water injection huff and puff technology has become the main development technology of tight oil.In the initial stage of water injection huff and puff, higher production was achieved,however,with the increase of huff and puff times,the production decreased rapidly and the oil⁃water replacement efficiency was low.Based on the compact oil data of Jimusaer Oilfield in Xinjiang,through laboratory core water injection huff and puff experiment and single well water injection huff and puff numerical simulation research,the effects of injection volume,time of water injection huff and puff,injection speed, huff and puff times,soaking time and production speed on water injection huff and puff recovery are analyzed.The single well geological model is established,and the influencing factors of water injection huff and puff are fitted by multi⁃nonlinear function.The empirical formulas of five parameters and three parameters of water injection huff and puff are deduced for the first time. The prediction error is within 8%, which provides important reference for the development of water injection huff and puff in the study area and similar tight reservoirs.

The permeability and absorption experiments of low permeability sandstone core under the actual formation temperature and pressure were carried out,which were used to analyze the waterflooding huff⁃puff 's oil recovery law of imbibition and compared with imbibition experiments of normal temperature⁃pressure.The experiments show that the imbibition efficiency of normal temperature⁃pressure is 18%~24%,with an average of 21%.The permeability rate of core in the first six hours is the fastest,which is 0.8~1.7 %/h.The imbibition efficiency of actual reservior's temperature and pressure conditions is 24%~31%,with an average of 27%;Imbibition rate is the fastest in the first round,which is 2.6~3.6 %/h.Compared with imbibition of normal temperature⁃pressure,the imbibition of actual reservior 's temperature and pressure conditions can promote the imbibition efficiency by 5% to 7%,and the imbibition rate is also significantly higher than the imbibition of normal temperature⁃pressure.The analysis believes that imbibition of actual reservior 's temperature and pressure conditions can increase the imbibition's power and reduce the imbibition's resistance,which is more conducive to oil⁃water displacement.Furthermore,the theoretical calculation model of the imbibition depth is established, and the cores' imbibition depth is about 0.25~0.63 cm.It is considered that the depth of the early rapid imbibition stage is in the centimeter range,and the imbibition depth increases with the imbibition efficiency.According to the comprehensive research,increasing the reservior's pressure and large⁃area fracturing can effectively improve the imbibition efficiency.

Due to the strong stress sensitivity and threshold pressure gradient of the tight oil reservoir in Jimsar, Xinjiang, the current nonlinear seepage model cannot reflect the seepage characteristics of the tight reservoirs. Therefore, based on the physical simulation experiment of indoor core flooding, a new nonlinear seepage model of compact reservoir considering threshold pressure gradient and stress sensitivity is established, and the pressure gradient utilization map is drawn according to the model. The results show that the threshold pressure gradient of the tight reservoir has logarithmic relationship with permeability. The error between the seepage characteristic curve of the new model and the actual seepage characteristic curve of the reservoir is less than 5.00%, which can truly reflect the actual seepage characteristics of the reservoir. The higher the permeability, the higher the pressure gradient utilization rate (N), the less the pressure loss. With the pressure gradient increases, N increases logarithmically. Therefore, in order to improve the effective utilization of the tight reservoir pressure gradient, it is necessary to increase the production pressure difference, and take acidizing and fracturing measures to improve the reservoir permeability.

Alluvial fan is a typical continental fan accumulation formed after the outflow of the river (flood). There are two kinds of sedimentary mechanism, the traction flow and the debris flow in the fan root area，which make the sedimentary model of alluvial fan complicated. The exposed alluvial fan phenomenon is well in Zhebu countryside, Laiyang city, Shandong province, which belongs to Cretaceous Wangshi group Xingezhuang Formation. Through the detailed observation and measurement on the section, using the sedimentary principle of the outcrop, the sedimentary environment was thought being an alluvial fan, which developed chaotic accumulation of conglomerate facies (Gms), massive bedding conglomerate facies (Gmh), trough cross bedding sandstone facies (St), planer cross bedding sandstone facies (Sp), horizontal bedding sandstones (Sh), floodplain mudstone (Fl) and massive bedding mudstone (M). The trough flow facies belt, slice flow facies belt, braid flow facies belt, runoff facies belt were identified. The facies of the trough flow belt and the slice flow facies belt were the least exposed, and the upper part of the main section was mostly debris flow deposits. The facies of the runoff facies and the braided flow facies were the most exposed, showing the characteristics of the interaction between sand and mud. In view of this, based on the study of the sedimentary characteristics of different facies zones, the sedimentary model was established and the evolution characteristics of the profile were analyzed combined with the outcrop characteristics of alluvial fan in Laiyang, Shandong province.

A cardanol phenolformaldehyde resin was synthesized using cardanol and formaldehyde as raw material, and the cardanol based phenolformaldehyde resin block polyether demulsifier (CPFE) was further synthesized using cardanol phenolformaldehyde resin as initiator through polymerization with epoxy propane (PO) and epoxyethane (EO), respectively. The crtical micelle concentration of CPFE was measured with the method of surface tension, and the results showed that the crtical micelle concentration of CPFE was 80 mg/L and the γcmc was 17.38 mN/m. The oilwater interfacial tension of CPFE was determined with a spinning drop tension meter. The influences of concentration and temperature on oilwater interfacial tensions were discussed in detail. Experimental results showed that the oilwater interfacial tension dereased obviously with the increase of concentration of CPFE, and the interfacial activity of CPFE dedined as temperature increased, which illustrated that the CPFE could be applied in low temperature environment. The oil droplet rupture constant k was measured by single droplet method, and the oil droplet rupture constant k increased with the increase of CPFE concentration. 

Based on the corrosion status of water injection pipeline in A block of Changqing oilfield, contact corrosion between injected water and pipeline is simulated in laboratory. The weightloss method is used to study on the corrosion rate of oilfield water injection pipeline under different experimental factors (current speed, temperature and pressure). Taking the corrosion rate of oilfield water injection pipeline as the reference sequence, and the various influence factors as the comparison sequence, the Grey Relation Analysis method is adopted to get the correlation coefficient of various influence factors. Then, the correlation degree can be calculated. According to the size value of the calculation, the correlation degree can be sorted. Combined with the experimental results and the theoretical calculation, the main influence factors of water injection pipeline corrosion rate in A block are determined. This provides a reference for the same kind of oilfield block on water injection pipeline corrosion control.

Taking low permeability minor faulted block reservoir in fengtan block of Zhejiang oilfield as an example, through the research on flooding pattern form under fracturing situation by numerical reservoir simulation, compared to flood development effect of different well pattern which were triangular pattern, rectangular inverted five-spots pattern, quadrate inverted nine spot pattern, diamond inverted nine spot pattern and so on, the finding indicates the development effect of rectangular inverted five-spots pattern under fracturing situation is best. And it researches rational injector producer distance of inverted five-spots pattern on minor faulted block reservoir under different permeability and reservoir thickness. The research achievement has a guiding role in initial development design and development regulate of low permeability faulted block reservoir.

Two phenol-amine resin were synthesized using cardanol as raw materials,and then four amphiphilicc ardanol based phenol-amine resin block polyethers(CPAE)of different molecular weight were further synthesized using phenolamine resin as initiator through addition reaction with epoxyethane and epoxypropane respectively.Four CPAE were characterizad byFT-IR.The surface tension and interfacial tension were measured,and demulsification performance were studied using bottle test.The results show that the cmc and γcmc of CPAE increased with the increasing of EO content.The interfacial tension of CPAE aqueous decreased and dewatering rate increased as the concentration increased.Under the conditions of 80 mg/L,35 ℃ and 100 min,the dewatering rates of four CPAE are all above 70%,far superior to that of commercial demulsifiers SP169,BP169 and TA1031.

The compatibility between four phenolic antioxidants and PE(7047)was studied quantita-tively and qualitatively by weight increased and FT-IR spectra.The results show that hindered phenolic antioxidants have poor stationarity on compatibility with PE in high temperature,the effect of concentration on the compatibility of hindered phenolic antioxidant and PE is little.All the four antioxidants have good compatibility with PE resin,in the range of additive amount,and BHT is the best,1098 and 1076 followed,1010 in the end,and the effect of molecular structure on compatibility had been discussed briefly.

The phenol-amine resin was synthesized through dehydration condensation reaction of bisphenol A, diethylenetriamine and formaldehyde at reaction temperature 70 ℃, reaction time 60 min and the post treatment was 120 ℃, 1.33 kPa. PAE polyether demulsifiers with different EO mass fraction and mass ratio of initiator to PO were synthesized through reactions with different proportions of propylene oxide and ethylene oxide using phenol-amine resin as initiator. The characterization of PAE demulsifiers was studied by surface tension measurement and UV-vis spectra method. The results show that within low concentrations the ability of decreasing surface tension increased with decreasing EO mass fraction and increasing mass ratio of initiator to PO; the efficiency of decreasing surface tension increases with increasing mass ratio of initiator to PO and decreasing EO mass fraction. From the demulsification experiments a conclusion has been drawn that the final dehydration rate of demulsifiers increased with increasing mass fraction of EO; the speed of reaching dehydration platform is faster for the demulsifier with high mass ratio of initiator to PO. Dehydration rate of 80% is observed at 40 ℃,15 min and dosage 20 mg/L for PAE84, and there is no demulsification effect for SP169 at the same condition.

The S ₂O ^2- ₈/ZrO ₂  solid acid catalyst was prepared from ZrOCl ₂ and (NH ₄) ₂S ₂O ₈ by precipitation, aging, filtering, washing, drying, impregnation and calcination processes. The characterization of the catalyst was performed using XRD, FT-IR and NH ₃-TPD. The effect of calcination temperature on the acidic property, textural property and catalytic perfomance of S ₂O ^2- ₈/ZrO ₂ solid acid catalysts was studied. XRD patterns show that the catalyst present is higher tetragonal phase. FT-IR spectra shows that S ₂O ^2- ₈ is strongly bind with the ZrO ₂ surface bidentately. With S ₂O ^2- ₈/ZrO ₂ as catalyst,the effects of molar ratio of glycol to aldehyde, quantity of catalyst, reaction time on the yield of acetalation was more systematically studied and the best reaction conditions were confirmed.  The results show that the molar ratio of butyraldehyde to glycol is 1∶1.4, the quantity of catalyst is equal to 0.25% of feed stocks, the reaction time is 50 min, and the yield of butyraldehyde glycol acetal can reach 75.8%; the yield of benzaldehyde glycol acetal is 68.8% under the following conditions：molar ratio of benzaldehyde to glycol 1∶1.25, the quantity of catalyst 0.5% of feed stocks, the reaction time 50 min.