Layer-by-layer deposition wall-fixing agent dispersion liquid for drilling fluid and preparation method thereof

Abstract

The invention provides a layer-by-layer deposition wall-fixing agent dispersion liquid for drilling fluid. The layer-by-layer deposition wall-fixing agent dispersion liquid comprises the components inparts by weight: 50-60 parts of a base liquid, 30-40 parts of wall-fixing particles, 5-8 parts of a main dispersing agent and 2-5 parts of an auxiliary dispersing agent. A preparation method comprises the following steps: dissolving the main dispersing agent and the auxiliary dispersing agent in water to prepare an aqueous solution; adding the wall-fixing particles into the aqueous solution; performing ultrasonic treatment; and taking an upper-layer solution, and performing centrifugal separation. The wall-fixing agent dispersion liquid is mainly used for reinforcing a drilling well wall, a layer-by-layer deposition structure can be formed on the surface of the well wall, the structural mechanical strength is high, the compactness is good, invasion of drilling fluid to the stratum can beeffectively reduced, and well wall instability is reduced; meanwhile, the influence of the layer-by-layer deposition wall fixing agent dispersion liquid on the rheological property of the drilling fluid is small, the problem that fine particles are prone to thickening is solved, and the good using effect is achieved in the drilling fluid.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling chemical additives, in particular to a layer-by-layer deposition wall-solidifying agent dispersion liquid for drilling fluid and a preparation method thereof. Background technique [0002] In the process of oil and gas drilling, wellbore stability is a common problem. The factors causing wellbore instability can be summarized into three categories, including geological factors, drilling fluid process factors and drilling process factors. Geological factors are difficult to change, and can only be predicted or determined as accurately as possible to provide guidance for drilling fluid technology and drilling technology. The fluid column pressure of the drilling fluid itself is the most important factor for stabilizing the wellbore during drilling, followed by the mud cake formed around the wellbore after the drilling fluid is lost. Changing the properties of drilling fluid is one of th...

AI Technical Summary

Problems solved by technology

However, the shortcomings or shortcomings of these technologies are that the control effect of drilling fluid loss has not yet reached the ideal result, and there is still a large amount of filtrate intruding into the rock, resulting in hydration of the rock, thereby increasing the risk of well wall collapse