Self-foaming flushing fluid tackifier, flushing fluid configuration reagent, and flushing fluid

Abstract

The invention belongs to the field of oil and gas field well drilling, and more specifically provides a self-foaming flushing fluid tackifier, a flushing fluid configuration reagent, a flushing fluid, and a preparation method of the flushing fluid. The self-foaming flushing fluid tackifier is mainly composed of a fracturing thickening agent, a biopolymer, a high molecular filtrate reducer, polyvinyl alcohol, sodium bicarbonate, and bentonite at a certain ratio; the flushing fluid configuration reagent is mainly composed of the self-foaming flushing fluid tackifier; and the flushing fluid is mainly prepared from the flushing fluid configuration reagent. The flushing fluid possesses following beneficial effects: safety guarantee is provided; inert gas cost is reduced; sand carrying capability is excellent; inhibitive ability is excellent; foam liquid water loss is relatively low; return permeability is excellent; compatibility is excellent; and the flushing fluid is convenient for construction, and is low in corrosivity.

Description

technical field [0001] The invention belongs to the field of oil and gas field drilling, and in particular relates to a viscosifier for self-foaming well flushing fluid, a well flushing fluid preparation agent, a well flushing fluid and a preparation method of the well flushing fluid. Background technique [0002] With the development of oil and gas fields for many years, there are generally production problems such as formation pressure coefficient less than 1MPa, productivity decline, water yield increase, sand content increase, production cycle shortening and workover interval shortening. [0003] Water-based fluids are commonly used in oil and gas well construction operations. Since the formation pressure coefficient is less than 1MPa, the water-based liquid will produce a large amount of leakage during construction operations, and the amount of leakage at one time can be as high as 100m 3 above. The loss of well flushing fluid will not only cause a decline in producti...

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Problems solved by technology

At the same time, the suction will induce severe sand production. The direct consequence of severe sand production is that production cannot continue

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