Micro-emulsion for water base drilling fluid for blocking micro-cracks in shale stratums
A technology of water-based drilling fluid and plugging mud, which is applied in the field of microemulsion, can solve the problems of poor micro-pores and micro-cracks, etc., and achieve good plugging effect, stable performance, and the effect of slowing pressure transmission
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Embodiment 1
[0018] In parts by weight, 42 parts of No. 10 white oil, 1 part of sodium chloride, 5 parts of sorbitan fatty acid ester, 12 parts of n-amyl alcohol, 8 parts of nano-calcium carbonate, 5 parts of fatty alcohol ether phosphate, organic silicon 0.5 parts of defoamer, 25.5 parts of water.
[0019] The storage stability and particle size distribution of the microemulsion were investigated according to the following experimental methods.
[0020] Placement stability: The product is placed statically for a long time, observe the appearance, and pay attention to whether there is delamination.
[0021] Particle size distribution: use LB550 dynamic light scattering particle size distribution meter to measure the particle size distribution of the microemulsion.
[0022] The experimental results are: no delamination after being placed for 180 days; d90 value is 148.4nm.
Embodiment 2
[0024] In parts by weight, 36 parts of kerosene, 1.5 parts of potassium chloride, 4 parts of sodium dodecylbenzenesulfonate, 6.5 parts of tall oil fatty acid, 6 parts of nano calcium carbonate, 10 parts of ethylene glycol, polyether F-60.3 parts, 35.7 parts of water.
[0025] Tested according to the method described in Example 1, the experimental results are: no delamination after being placed for 180 days; d90 value is 96.6nm.
Embodiment 3
[0027] In parts by weight, 50 parts of No. 10 white oil, 1 part of sodium acetate, 6.5 parts of polyoxyethylene sorbitan monostearate, 4.5 parts of triethanolamine, 10 parts of nano-silica, 6 parts of propylene glycol, propylene glycol block 0.3 parts of polyether, 21.7 parts of water.
[0028] Tested according to the method described in Example 1, the experimental results are: no delamination after being placed for 180 days; d90 value is 156.2nm.
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