Anti-salt and anti-calcium fluid loss reducer for drilling fluid and preparation method thereof

Abstract

The invention discloses a salt-resistant and calcium-resistant filtrate reducer applied to a drilling fluid and a preparation method of the filtrate reducer. The filtrate reducer is prepared from raw materials and water, wherein the raw materials comprise 2-acrylamide-2-methyl propane sulfonic acid, acrylic acid, acrylamide and dimethyl diallyl ammonium chloride; the ratio of m(2-acrylamide-2-methyl propane sulfonic acid) to m(acrylic acid) to m(acrylamide) to m(dimethyl diallyl ammonium chloride) to m(initiator) to m(molecular weight control agent) is (40-60) to (6-10) to (30-40) to (5-9) to (1-2) to (0.1-0.5). The molecular weight of the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid and prepared by the preparation method is greatly improved; the coating property, the inhibition property, the heat stability and the salt-resistant and calcium-resistant pollution capacity of the filtrate reducer are greatly improved; by virtue of the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid, the rheological property of the drilling fluid can be greatly improved; the salt-resistant and calcium-resistant filtrate reducer applied to the drilling fluid also has a high temperature-resistant effect at 150-180 DEG C.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method thereof, in particular to a salt and calcium resistance fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid is one of the most used oilfield chemicals, and fluid loss control agent is a very important additive in drilling fluid. When the fluid loss of drilling fluid is too large, it will not only lead to the loss of drilling fluid, but also lead to the collapse of the well wall and the pollution of the reservoir and other serious consequences. The addition of fluid loss reducer can significantly reduce the fluid loss of drilling fluid, maintain a stable well wall, and ensure fast and safe drilling. With the consumption of oil resources and the increasing demand for oil in people's production and life, it has become inevitable to use deep wells and ultra-deep wells to exploit and utilize oil and gas ...

AI Technical Summary

Problems solved by technology

However, as the formation depth increases, the formation structure gradually becomes more complex, which increases the difficulty of drilling, and often encounters high-pressure oil and gas layers and saline layers during drilling, which puts new challenges on the salt resistance of drilling fluids. requirements

However, the existing fluid loss control agents can no longer meet the requirements of drilling fluids for drilling in complex formations and deeper formations, especially the ability to resist salt and calcium

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