Heat-resistant and salt-resistant high temperature and high pressure filtrate loss reducer for drilling fluid, and preparation method of filtrate loss reducer

Abstract

The invention discloses a heat-resistant and salt-resistant high temperature and high pressure filtrate loss reducer for drilling fluid, and a preparation method of the filtrate loss reducer. The filtrate loss reducer is prepared from the following components: a polymer monomer and nano silicon, wherein the polymer monomer is prepared from acrylic acid, 2-acrylamide-2-methyl propanesulfonic acid,acrylamide and vinylpyrrolidone; the filtrate loss reducer is prepared from the following components in parts by weight: 1-5 parts of acrylic acid, 1-4 parts of 2-acrylamido-2-methyl propanesulfonic acid, 6-12 parts of acrylamide, 1-3 parts of vinylpyrrolidone and 0.5-1 part of the nano silicon. Compared with the prior art, the filtrate loss reducer provided by the invention has excellent heat resistance, salt resistance as well as high temperature and high pressure reduction performance; the filtrate loss reducer has a better filtrate loss reduction effect in the drilling fluid; an acting effect between functional groups on a side chain and clay particles is obvious, so that a formed mud cake is good in quality; the filtrate loss reducer has a good filtrate loss reduction effect both in the drilling fluid of fresh water and saline water.

Description

technical field [0001] The invention relates to the technical field of drilling fluid treatment agents, in particular to a temperature-resistant, salt-resistant, high-temperature, high-pressure fluid loss reducer for drilling fluids and a preparation method thereof. Background technique [0002] With the continuous exploration and development of crude oil, the important problem faced by my country's oil exploitation is that the formation temperature and pressure are too high due to the continuous increase of well depth. Under the environment of high temperature and high pressure, the drilling fluid additives are prone to adsorption, cross-linking and degradation, which will deteriorate the performance of drilling fluid and lead to downhole accidents. In order to solve the above problems encountered in the drilling process, higher requirements are put forward for the drilling fluid treatment agent, especially the drilling fluid fluid loss control agent with good resistance to...

AI Technical Summary

Problems solved by technology

Although there are many types of fluid loss control agents at present, it is not common to use high temperature and high pressure fluid loss control agents under high salinity and high temperature conditions