Water-based drilling fluid for leakage protection and sealing of induced fissures
A water-based drilling fluid and inductive technology, applied in the field of drilling fluid, can solve the problems of leakage economic loss, the success rate of one-time plugging is less than 80%, and the distribution area of induced fractures is wide, so as to achieve the effect of improving the success rate
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Embodiment 1
[0043] This embodiment provides a water-based drilling fluid for leak prevention and plugging of induced fractures, which includes the following substances in weight percentage:
[0044] A. Polyacrylamide: 0.3% to 0.5%.
[0045] B. Sulfonated pitch: 0.5% to 0.6%.
[0046] C. Fluid loss reducer: 0.3% to 0.5%.
[0047] D. Polymer gel plugging agent: 0.2% to 0.3%,
[0048] The polymer gel plugging agent is an inorganic salt that can provide potassium ions or sodium ions, where the polymer gel plugging agent can be potassium chloride or sodium chloride or potassium nitrate.
[0049] E. Bridge plugging agent: 0.3% to 0.5%,
[0050] The particle size distribution of bridge plugging agent is:
[0051] 15-20% particle size 0.05-0.1mm;
[0052] 20-25% particle size 0.1-0.2mm;
[0053] 15~20% particle size 0.2~0.3mm;
[0054] 5~15% particle size 0.3~0.4mm;
[0055] 5~10%QD-2;
[0056] 1~5% particle size 0.4~0.5mm.
[0057] F. Rubber particles: 2% to 3%,
[0058] The particle ...
Embodiment 2
[0095] Qingtongxia sodium soil 12%+NaOH0.6%+Na2CO30.4%+QD—22%+QD—36%+3mm rubber particles 3%+5mm rubber particles 4%+8mm rubber particles 3%+CDL—10.5% +2-4 mesh rice stone 6%+5-8 mesh rice stone 3%+5-20 mesh rice stone 5%.
[0096] Field application of leak plugging in Well Yuan 303-54: the leaked well is 600-770m deep, the leaked layer is multi-point leaked in the Luohe Formation, and the leaked rate is 40-60m 3 / h, the leakage volume is 450m 3 .
[0097] At 23:00 on July 12th, when drilling to 600 meters, there was a sudden serious loss of no return. Up and down movable drilling tools, equipped with bridge plug plugging slurry 40m 3 After injecting into the bottom of the well, turn on the pump for 50 seconds, 1 / 2 of the mud will return, and resume drilling after the circulation is normal. At 12:00 on July 13th, the fluid volume gradually decreased at a depth of 670-700 meters, and the leakage increased. When the drilling reached 727 meters, the mud did not return to the ...
Embodiment 3
[0100] Qingtongxia sodium soil 10%+NaOH0.5%+Na2CO30.3%+QD—23%+QD—35%+5mm rubber particles 2%+8mm rubber particles 1%+CDL—10.5%+2—4 mesh rice Stone 5% + 5-20 mesh rice stone 4%.
[0101] Field application of leak plugging in well Yuan 307-55:
[0102] The leaking well is 572-1020m deep, and the leaking layer is multi-point leaking in the Luohe Formation, and the leaking rate is 30-50m 3 / h, the leakage volume is 600m 3 . There was liquid flow back in the well, and the construction team did not pay enough attention to it, so the leakage was plugged by the method of plugging while drilling.
[0103] At 21:00 on August 5th, clear water was used for two openings, and at 11:20 on August 7th, when drilling reached 572 meters, a serious leakage occurred suddenly. Drilling out to the casing corner, equipped with bridge plug plugging slurry 20m 3 After injecting into the bottom of the well, inject 10m at the wellhead for 12 minutes 3 Drilling fluid was not poured to the wellhead; ...
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