Reversible invert emulsion can combines the advantages of different liquid forms in one to play a better role that is expected, it is mainly used to prerare reversible invert emulsion drilling fluid. Thought about the hydrochloric acid used in the oilfield is mainly industrial hydrochloric acid(concentration is 15%~20%),which is different from the diluted hydrochloric acid(concentration is near 5%) used in laboratory, and the concentration of different batches industrial hydrochloric acid is also different, this paper take a study on the effect of the concentration of acid and alkali on the performance of the pH⁃responsive reversible invert emulsion.Studies have been conducted on the effects of acid and base concentration on the pH⁃controlled reversible emulsion,by measuring microstructure and bulk properties of the emulsion.The studies demonstrated that, different acid/base concentrations result in different acid/base densities can affecting the phase transition point of the reversible emulsion, the difference in acid/base concentration causes the volume of the aqueous phase accompanying the addition of acid/base to the emulsion system, which also affects the phase transition point of the reversible emulsion, but the former has a greater impact than the latter.

In order to study the influence of gravel size and strength characteristics on the propagation mode and mechanical parameters of glutenite, a heterogeneous core model of glutenite was established by using the rock fracture process simulation system RFPA. The failure process and fracture propagation law of sandy conglomerate core and the variation of elastic mechanical parameters such as compressive strength, Young's modulus and Poisson's ratio with the change of gravel size and mechanical properties were studied. The results showed that with the increase of gravel size, core model of Poisson and Young's modulus increase gradually, intensity, and increase with the decrease of the first and core crack morphology of different gravel size is almost the same; With the increase of gravel strength, the compressive strength of rock uniaxial compressive strength gradually increased, and then remained basically unchanged, mainly determined by matrix strength. The results reproduce the process of crack initiation and propagation of gravel, and the influence law of gravel size and strength on core fracture is obtained.