Fractured stratum high-elasticity high-temperature-resistance plugging agent for drilling fluid and preparation method of plugging agent

Abstract

The invention relates to the technical field of petroleum drilling materials, in particular to a fractured stratum high-elasticity high-temperature-resistance plugging agent for drilling fluid and a preparation method of the plugging agent. The fractured stratum high-elasticity high-temperature-resistance plugging agent for the drilling fluid is composed of sponge fibers, filled particles, a nano-micron lubricant and a viscosity regulator. An elastic material is adopted as a framework material, and easily enters cracks, and bridges are formed in the cracks, the plugging agent is made of a high-temperature resistant material, the success rate of plugging can be effectively improved, and repeated leakage is avoided. The plugging agent has good retention property, especially for large cracksand cave leakage, effective plugging can be formed at the position of a leakage layer, meanwhile, it can also be ensured that the plugging agent has good fluidity in the drilling fluid, and downhole complications due to poor rheology are prevented.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling materials, in particular to a high-elasticity and high-temperature-resistant leakage plugging agent for drilling fluid in fractured formations and a preparation method thereof. Background technique [0002] Lost circulation refers to the leakage of various working fluids (including drilling fluid, cement slurry, completion fluid and other working fluids, etc.) ground phenomena. Lost circulation is one of the most serious hazards and complex situations that affect the safety of drilling operations. The occurrence of lost circulation will not only bring inconvenience and loss to drilling engineering (such as consuming drilling time, loss of drilling fluid and plugging materials, causing stuck pipe, blowout, etc.) A series of complex situations such as well collapse and even lead to the scrapping of the wellbore, and damage to the production layer, resulting in major economic losses), als...

AI Technical Summary

Problems solved by technology

However, on the whole, some of the above-mentioned plugging materials have complex on-site preparation, poor stability, need to trip out, time-consuming, and poor formulation specificity; plugging materials have weak temperature resistance, are prone to failure at high temperatures, and repeated leakage occurs , and weak elasticity, poor matching with cracks, the shape cannot be restored after cracking, which is not conducive to the later implementation of bridging and network formation, single use, and can not be used for plugging various types of leakage; plugging agent has poor retention, especially for large The leakage of fractures and karst caves cannot be effectively blocked at the location of the leaking layer. At the same time, the fluidity of the plugging agent in the drilling fluid is poor, resulting in complex situations downhole