The Study Of High-temperature Oil-soluble Temporary Plugging Agent

As the increasing demand for energy and resources, and the resource in low-and intermediate-level layer has been developed basically, the deep layers' development has become inevitable. However, there are only a few temporary plugging agents which can be applied in high temperature reservoir; The main mission of this issue is that synthesizing a temporary plugging agent which can be applied in high temperature reservoir to meet current needs.In this paper, three oil-soluble resins with different softening points have been synthesized, and the experiments about their oil-soluble, dispersion, salt resistance, acid resistance and anti-high-temperature have been conducted; The type and ratio of dispersant and suspension stabilizer which is used to synthesize temporary plugging agent have been determined; The effect of different additives on the softening point of temporary plugging agent as well as the relationship between penetration and the particle size of temporary plugging agent have been studied, and the range of temporary plugging agent's particle size has been determined in accordance with the theory and practical experience.The effect of temporary plugging and plugging removal as well as the strength of temporary plugging under the conditions of different temporary plugging agent concentration, the injection of different volume, different temperature and fluid volume, different displacement pressure have been analyzed by indoor simulation devices. At the same time comparative experiments of its water shutoff performance also be conducted with other types of temporary plugging agent.A large number of experimental results show that: the temporary plugging effect of this oil-soluble temporary plugging agent is good, and use of polymer, active agent formulation into the suspension after the injection of 2～4PV, injection concentration of 3%～5% of temporary plugging rate is more than 94 percent and the restoration ratio of permeability to oil reaches 90%. Simultaneously it has good temporary plugging effect on different permeability cores, which shows that oil-soluble temporary plugging agent has a better effect for the protection of oil and gas layer and a broad scope of application.