Chiral epichlorohydrin is obtained by kinetic resolution of racemic epichlorohydrin through hydrolysis. Chiral epichlorohydrin is a valuable intermediate which is widely used in the synthesis of medicine and material. Salen refers to a base formed by the condensation of two identical aldehyde molecules and a diamine molecule, and the complex formed by its combination with metals is called Salen metal complex, which is often used in the synthesis of chiral epichlorohydrin. In this paper, the development of Salen metal complex catalysts and their application in chiral epichlorohydrin synthesis are reviewed. At the same time, the deactivation mechanism of catalyst in the process of hydrolytic kinetic resolution was investigated and the application prospect of synthesis of chiral epichlorohydrin using Salen metal complex catalysts was prospected.

Laboratory research on protective agents for reservoirs was carried out to solve the problem of reservoir damage during drilling in Biyang Sag of Henan Oilfield.Under alkaline conditions,starch microspheres were prepared with corn starch, epichlorohydrin, and polyethylene glycol 20000 as the main raw materials, and then the starch?based protective agent DYB for reservoirs was prepared by the compound of the starch microspheres, regenerated fiber, calcium carbonate (QS?2), and emulsified asphalt (SFT). Scanning electron microscope and thermogravimetric analyzer were used to study the micromorphology and thermal stability of the synthesized product and evaluate the performance of DYB, such as shale rolling recovery and plugging. The results indicate that the particle size of starch microspheres is in the range of 3~5 μm, and the shale recovery rate of DYB in the base slurry is over 85.0%, the API filtration loss of the base slurry after aging at 120~180 ℃ is controlled within 12 mL. After 3.0% DYB is added to the simulated field drilling fluid, its pressure?bearing capacity in the sand bed can reach 4.00 MPa, while the membrane pressure?bearing capacity in the artificial core is over 10.00 MPa, and the recovery value of core permeability is over 82.0%.

Mg?Al?LDH was synthesized by the constant pH co?precipitation method,and the micro?structure and composition of the layered bimetallic hydroxides were characterized by X?ray diffraction (XRD),scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS) and BET.The results show that LDHs were successfully prepared with a layered structure,a high degree of order,and mesopores.The toluene?n?heptane method was used to separate the asphaltenes in Tahe into heavy component A₁ and light component A₂.The elemental analysis indicates that A₁ had the highest polarity,followed by the Tahe asphaltenes and A₂.This paper further investigated the adsorption properties of Mg?Al?LDH for asphaltenes and their sub?components A₁ and A₂ in Tahe and found that the adsorption equilibrium can be reached within 2~3 h.The experimental data fitted well with the pseudo?second?order kinetics,and the adsorption isotherms followed the Langmuir model. The adsorption capacity of Mg?Al?LDH was 71.38,140.65 and 39.31 mg/g for asphaltenes in Tahe and their sub?components A₁ and A₂,respectively.

A self?made long?chain cationic surfactant (SFC111) and a low interfacial energy substance (SFC115) were used to prepare a cationic emulsion for further application as surfactant for low permeability oil and gas reservoirs. The dispersion of the emulsion in water, the contact angle of the core before and after the emulsion treatment and the surface tension were investigated by particle size analyzer, contact angle meter, and rotating drop interfacial tension meter, respectively. The thermodynamic parameters of the emulsion at 20 ℃ and 70 ℃ were calculated. Particle size of 0.5% concentration emulsion is D₅₀=420.8 nm at 20 ℃, D₅₀=728.0 nm at 70 ℃.The contact angle of clear water on the surface of the core increases from 10° to 120°. The emulsion could reduce the surface tension of water to 24 mN/m at 70 ℃, indicating the good waterproof lock performance. The adsorption characteristic of emulsion conforms to the langmuir adsorption theory. The thermodynamic results show that as the temperature increases, the amount of adsorption on the surface of the emulsion decreases, the area occupied by the molecules on the surface of the emulsion goes down, and the thickness of the adsorption layer decreases.

Tahe asphaltene (T_A) was separated into heavy component(T_A1) and light component (T_A2). The surface morphology, crystal structure and functional group structure of T_A, T_A1 and T_A2 were characterized by Scanning Electron Microscope (SEM), X?ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT?IR) and ¹H?Nuclear Magnetic Resonance Spectrum (¹H?NMR). The results show that TA has less long?chain structure, more branched chains in side chains, and is mainly composed of short branched alkyl structure such as methyl, ethyl and propyl. Sub?components T_A1 and T_A2 show obviously different microstructure after separated from T_A. TA1 has the highest degree of graphitization, the longest branched chain, more side?chains of aromatic ring, less branched chains of alkyl side?chains and relatively strong aromaticity, while T_A2 has lower degree of graphitization, more branched chains of alkyl side?chains, less side?chains of aromatic ring and relatively weak aromaticity.