High temperature resistant circulating micro-foam drilling fluid or completion fluid

Abstract

The present invention discloses one kind of high temperature recyclable microbubble drilling and completing fluid, which includes basic slurry comprising bentonite 1-2 (in weight portions, the same below), salt tolerant clay 3-5, sodium carbonate 0.2-0.3 and water 100; and additives comprising high temperature inhibitor 3-5, high temperature tackifier 2-5, high temperature filter loss reducing agent 3-6, high temperature salt resisting filter loss reducing tackifier 1-3, flow form regulator 1-3, high temperature foaming agent 2-5 and high temperature foam stabilizer 1-2.5. The high temperature recyclable microbubble drilling and completing fluid has excellent high temperature performance, high carrying, suspending capacity in low pressure deep well, and functions of inhibiting the hydrating expansion of mudstone and protecting oil and gas reservoir, is suitable for different types of high temperature stratum. It is applied in well drilling and well completing construction for low pressure and low permeation stratum.

Description

1. Technical field [0001] The invention relates to drilling and well completion fluids, in particular to a high-temperature-resistant circulating microfoam drilling fluid or well completion fluid. 2. Background technology [0002] The existing microfoam drilling fluid technology used in oil drilling has (1) Chinese Patent No. 200410021014.8 titled "A Microfoam Foaming Agent and its Drilling Fluid System Formula", and its formula is: 5% base slurry+0.3% MF+0.03%SF+2%SMP-II+0.05%80A-51+0.2%XC+1%SPNH, its shortcoming or deficiency is that it can only be used in shallow wells and hard formations, and the foam has poor high temperature stability and cannot be used at high temperatures; (2 ) Chinese Patent No. 20041001323.7 titled "Application and Preparation Method of Surplus Activated Sludge Protein as Foam Drilling Fluid", its formula is parts by weight: bentonite 5, tackifier 0.1, stabilizer 0.2, foaming agent 0.5; The agent is hydroxymethyl cellulose; the stabilizer is polya...

AI Technical Summary

Problems solved by technology

[0002] The existing microfoam drilling fluid technology used in oil drilling has (1) Chinese Patent No. 200410021014.8 titled "A Microfoam Foaming Agent and its Drilling Fluid System Formula", and its formula is: 5% base slurry+0.3% MF+0.03%SF+2%SMP-II+0.05%80A-51+0.2%XC+1%SPNH, its shortcoming or deficiency is that it can only be used in shallow wells and hard formations, and the foam has poor high temperature stability and cannot be used at high temperatures; (2 ) Chinese Patent No. 20041001323.7 titled "Application and Preparation Method of Surplus Activated Sludge Protein as Foam Drilling Fluid", its formula is parts by weight: bentonite 5, tackifier 0.1, stabilizer 0.2, foaming agent 0.5; The agent is hydroxymethyl cellulose; the stabilizer is polyacrylamide; the above-mentioned foam technology has poor high-temperature stability and can only be used in low-temperature shallow wells, and can only be adapted to drilling in limestone formations. The effect is poor, and the use cost is high. During construction, the foam stability is poor, and the density cannot be reduced. When applied in high-temperature deep well reservoirs, it will cause serious pollution to the reservoir

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