Impervious fluid loss additive for petroleum well drilling

Abstract

The invention aims to provide non-infiltration filtrate reducer used in a petroleum drilling well in order to realize damage-free well drilling. The filtrate reducer meets the requirements of drilling fluid filtration loss during overbalance well drilling, and solves the problems of circulation loss and oil layer protection when drilling different pressure strata during oil field development. Thefiltrate reducer consists of inertia material lignocellulose with physical action, active mineral silicon micropowder with chemical action and polymer polyurethane with membrane effect which are mixed and stirred evenly according to a certain proportioning. Compared with other drilling fluid filtrate reducer, the non-infiltration filtrate reducer has the advantages that: the filtrate reducer has higher bearing capacity, and sand bed filtration loss is zero at 3.0MPa.

Description

technical field [0001] The invention relates to an additive used in petroleum drilling, in particular to a non-permeable fluid loss reducer for petroleum drilling fluid. Background technique [0002] In the process of oil drilling, it is the ultimate goal of the drilling operation to achieve no damage to the formation during the drilling operation, so that the damage to the original permeability of the reservoir by the drilling fluid can be reduced to the greatest extent, and the reservoir can be better protected so that the reservoir for evaluation and development. However, the traditional drilling method is overbalanced drilling, and the drilling fluid is easy to invade into the reservoir, thus causing damage to the reservoir. An alternative has been found in this area and that is underbalanced drilling, which has grown considerably in the past year and has gained popularity, however, like anything it has its drawbacks , in many cases, due to financial and technical cons...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a non-permeable fluid loss reducer for oil drilling in order to realize non-damage drilling, which can meet the requirement of drilling fluid fluid loss in the process of overbalanced drilling, and solve the problem of oil loss when drilling complex pressure formations in the process of oilfield development. The problem of a suitable non-osmotic fluid loss control agent to finally achieve the protection of the reservoir

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