Plugging flexibilizer

Abstract

The invention discloses a plugging flexibilizer, comprising the components in parts by weight: 5-12 parts of polypropylene fiber, 20-30 parts of rubber particles, 1-5 parts of high molecular polyacrylamide, 2-8 parts of toughened nylon, 2-8 parts of asbestos section, 5-12 parts of plant fibers, 4-7 parts of calcium hydroxide, and 0.1-0.4 part of polyanionic cellulose PAC-HV. A preparation method of the plugging flexibilizer comprises the following steps: orderly adding the components in parts by weight to a kneading machine according to a conventional preparation method at constant temperature and constant pressure; evenly mixing and stirring; and crushing into a 0.05-1mm granular product. The plugging flexibilizer has the characteristics of being wide in material source, free of toxicity and pollution, simple and convenient in construction technology, good in rheological property, good in pillar-forming property, strong in tenacity, not easy to fragilely fall off, high in plugging success rate and the like, does not easily generate a rupture and a brittle fracture in the drilling process after plugging, and is widely applied to pressure-loaded plugging engineering of low-pressure fractured formation, large cracks, large caves, subterranean rivers and serious voidage formation in petroleum and geological drilling.

Description

technical field [0001] The invention relates to a plugging and toughening agent for well drilling, in particular to a plugging and toughening agent. Background technique [0002] In oil drilling, walnut shells, sawdust, polymer plugging agents, and non-permeable fluids are generally used in complex formations such as large fractures, large karst caves, formation vents, underground rivers, serious formation deficits, and broken and weak formations. Plugging agents, gels and other materials are used as plugging and toughening agents. The above-mentioned substances can play a plugging role in general, but they have the following shortcomings and deficiencies: ① high brittleness and poor toughness, low compressive strength, Poor stability; ②The plunger is brittle and falls off after plugging, which can easily cause downhole complex situations and pipe sticking accidents; ③The plugging effect is not obvious, and a large amount of plugging materials is consumed and the plugging ti...

AI Technical Summary

Problems solved by technology

[0002] In oil drilling, walnut shells, sawdust, polymer plugging agents, and non-permeable fluids are generally used in complex formations such as large fractures, large karst caves, formation vents, underground rivers, serious formation deficits, and broken and weak formations. Plugging agents, gels and other materials are used as plugging and toughening agents. The above-mentioned substances can play a plugging role in general, but they have the following shortcomings and deficiencies: ① high brittleness and poor toughness, low compressive strength, Poor stability; ②The plunger is brittle and falls off after plugging, which can easily cause downhole complex situations and pipe sticking accidents; ③The plugging effect is not obvious, and a large amount of plugging materials is consumed and the plugging time is long; ③Large fractures and large karst cave formations 1. It is difficult to solve the cementation performance between the wellbore and the wellbore after plugging in seriously deficient formations; ④The cementation between the stratum and the plugging agent has no toughness after plugging in broken strata, and the phenomenon of repeated plugging occurs from time to time. The plugging effect is poor, which affects the drilling speed