A hybrid gel particle plugging agent while drilling and its preparation method

Abstract

The invention provides a hybrid gel particle-while-drilling plugging agent and a preparation method thereof. The plugging agent is prepared from the following raw materials in parts by mass: 20-35 parts of reactive monomer, 1.0-3.0 parts of cross-linking agent parts, 0.3-0.5 parts of initiator, 3.0-5.0 parts of silane coupling agent, and 0.5-2.0 parts of nanoscale rigid particles; the reactive monomers are methacrylamide, hydroxyethyl methacrylate, lauryl acrylate, Three or more combinations of tert-butyl methacrylate, dibutyl adipate, sodium p-styrene sulfonate, vinylbenzenesulfonic acid or divinylbenzene; the nanoscale rigid particles are nanoscale One or a combination of two or more of calcium carbonate, nano-silica, talc or wollastonite. The gel particle plugging agent prepared by the invention has the advantages of strong toughness, high temperature resistance, strong pressure bearing capacity at high temperature, and good plugging effect.

Description

technical field [0001] The invention relates to a hybrid gel particle plugging agent while drilling and a preparation method thereof, belonging to the drilling fluid plugging technology in the field of petroleum exploration and development. Background technique [0002] Lost circulation is a phenomenon in which drilling fluid invades and infiltrates into the formation through micro-fractures and pores due to the positive pressure difference between the oil and gas well and the formation. Lost circulation has always been a very common and difficult technical problem in the drilling process. Lost circulation will not only reduce the drilling speed, consume a lot of operating time, and lose a huge amount of materials and drilling fluid, but may also cause a series of complex accidents such as blowout and well collapse, and the most serious one will lead to the scrapping of the entire wellbore. and people have brought great property losses. In lost circulation, fractured and k...

AI Technical Summary

Problems solved by technology

The above-mentioned rigid nanomaterials, such as silicon dioxide, have strong water absorption due to the existence of surface hydroxyl groups, but there are problems such as insufficient binding force, poor dispersion and compatibility in the organic gel system; Simply adding conventional nano-rigid particles is easy to cause particle agglomeration, which makes the synthesized gel heterogeneous and has great limitations in the use of high-temperature and high-pressure formations, such as temperature resistance, pressure bearing capacity and toughness, etc. will be seriously affected

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