Lost circulation additives and drilling fluid in serious thief zone

Abstract

This invention has disclosed one kind and missed strata and bored and stopped up leaking at the same time seriously, well drilling liquid, it makes up, weight share: (A) Base thick liquid: Alta-mud 4-6, soda ash 0.2-0.3, water is 100, additive 1) carry and glue pharmaceutical SD-LHV 0.5-3, 2) lower and strain and lose pharmaceutical SK-III 0.5-2.5, 3) the flowing type regulates pharmaceutical SD-R 0.5-2.5, 4) the density regulates pharmaceutical SD-D 0.5-5, 5) pack and strengthen pharmaceutical MF-1, 6) join pharmaceutical MD-III 2-15, 7) the brige stops up pharmaceutical MD-III 8-20. This invention has function more, have a good adaptability, can already be used as stopping up and leaking the liquid, can be used as the well drilling liquid, can either use and miss layer apply Gao to permeate layer low-voltagly or, crack cave with stalactites and stalagmites type stratum, and leak and stop up with the characteristics, such as layer, etc.. It is miss to is it stop up leak and well drilling of the craft to get into at the same time stratum seriously to apply mainly.

Description

1. Technical field [0001] The invention relates to a drilling plugging agent, in particular to a plugging while drilling and a drilling fluid for seriously lost formations. 2. Background technology [0002] The existing lost circulation agents and fluids used in oil drilling have (1) bridge plugging agent, the formula is: 1-5 parts of bentonite, 1-5 parts of walnut shell, 1-5 parts of mica, made with water, its disadvantages Or the disadvantage is that the construction process is complicated, the construction period is long, only temporary plugging can not improve the pressure bearing capacity of the formation, and the plugging success rate is low; (2) fast setting cement, the formula is: 100 parts of oil well cement, 40-50 parts of water, 5-30 parts of coagulant, its shortcoming or deficiency is that the cement density is high, the thickening time, gelation time and pumpable time are difficult to control, and the problem of rapid loss or rapid curing of cement slurry is ver...

AI Technical Summary

Problems solved by technology

[0002] The existing lost circulation agents and fluids used in oil drilling have (1) bridge plugging agent, the formula is: 1-5 parts of bentonite, 1-5 parts of walnut shell, 1-5 parts of mica, made with water, its disadvantages Or the disadvantage is that the construction process is complicated, the construction period is long, only temporary plugging can not improve the pressure bearing capacity of the formation, and the plugging success rate is low; (2) fast setting cement, the formula is: 100 parts of oil well cement, 40-50 parts of water, 5-30 parts of coagulant, its shortcoming or deficiency is that the cement density is high, the thickening time, gelation time and pumpable time are difficult to control, and the problem of rapid loss or rapid curing of cement slurry is very easy to occur, and the construction safety is difficult to guarantee; (3 )DCM plugging agent, the formula is: 5-7 parts of bridging agent, 70-75 parts of filler, 1-5 parts of proppant, 15 parts of reinforcing agent, 0.1-0.5 parts of curing agent, its shortcoming or deficiency is only applicable For plugging micro-fractures and slight leakage formations

In short, the above-mentioned plugging agent has single function, weak adaptability, poor effect, high cost of use, long plugging construction period, and the density cannot be reduced during construction in low-pressure formations, which will aggravate the degree of leakage, especially for those formations with serious leakage and leakage storage. seriously polluted or damaged the strata of the formation, greatly reducing oil recovery