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Oil-based mud flushing agent CXJ-1
Summary：The key to oil-based mud cementing is to solve the flushing agent, remove the mud cake of oil-based mud, and let the subsequent pre-flush complete the wetting reversal process from oil infiltration to water infiltration, so as to provide a good environment for the cementing of cement slurry, so as to achieve the purpose of improving and ensuring the cementing quality.
The key to oil-based mud cementing is to solve the flushing agent, remove the mud cake of oil-based mud, and let the subsequent pre-flush complete the wetting reversal process from oil infiltration to water infiltration, so as to provide a good environment for the cementing of cement slurry, so as to achieve the purpose of improving and ensuring the cementing quality.
Our company combines theoretical research with experiments to develop an oil-based mud flushing agent CXJ-1, which has a strong cleaning and scouring effect on oil-based mud cake. Field application practice has proved that the effect is very good.
The flushing effect in the field cannot be visualized, but the flushing effect in the laboratory can be seen. The guiding ideology of determining the basic environment and conditions of indoor experiments is to exclude the best and worst, that is, extreme cases, and to consider the medium conditions of on-site construction, so as to achieve the results of the experiment and have practical application value for guiding on-site use. The washing effect of indoor oil-based mud washing agent is introduced:
1. Experimental materials:
oil-based mud
Separating agent GL-2H
Oil-based flushing agent CXJ-1
weighting agent jzj
Irrigant cx-1
2. Instruments and equipment:
a) Electronic balance: dividing value 0.01g, maximum weight 1000g;
B) Pallet balance: dividing value 0.1g; maximum weight 3000g;
d)ZNN-D6 six-speed rotational viscometer;
e) Wedge stirrer:
f) Common laboratory instruments.
3. Formula of weighted flushing spacer:
a）水 GL-2H CXJ-1 BP-1A cx-1 jzj
300 15 150 2 30 450
B) ̄GL-2H CXJ-1 BP-1A JZJ CX-1
300 15 150 2 30 450 30
Density: 1.6g/cm3
4. Experimental steps:
Invade the outer drum of the six-speed rotary viscometer into the oil-based mud, make the oil-based mud level reach the standard marking line of the outer drum, infuse it for 30min, take it out and hang it in the air with a wire for 10min. Install the outer drum into the drum, pour the well-equipped weighted flushing spacer into the sample cup to the marking line, and raise the tray to make the liquid level of the sample cup reach the marking line of the outer drum. The following experiment considers the displacement problem. The six-speed rotational viscometers are all operated at a speed of 200r/min. Calculated with the diameter of the outer cylinder of the six-speed rotary viscometer of 4cm, the annulus return speed is 0.418m at the speed of 200r/min.
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