How many processes does the drilling fluid have in the mud circulation process?
Under normal circumstances, the drilling fluid undergoes the following purification treatment processes of solids control equipment during the mud circulation process:
1. Frist mud purification process
Before drilling operations, the mud is configured through the jet mixing device, and the configured drilling fluid enters the bottom of the well under the high pressure of the mud pump, and carries the drilling cuttings back to the ground, and enters the BZ drilling fluid shale shaker through the mud return manifold. Under the action of the BZ drilling fluid shale shaker, 76um solids phase particles are separated through a 40-60 mesh screen and enter the mud pool. The mud filtered through the screen enters the mud tank.
2. Secondary mud purification process
When there is gas intrusion in the drilling fluid, the gas in the drilling fluid can be removed by the vacuum deaerator under the action of the vacuum pump to restore the density of the drilling fluid and stabilize the viscosity of the drilling fluid.
3. Three-stage mud purification process
After secondary purification, the drilling fluid enters the desander under the pressure of the slurry supply pump of the desander, passes through the high-pressure swirling flow of the desander cyclone, and the effective mud enters the desander bin with a solid thickness of 47-76um. The phase particles flow out from the drip nozzle of the desander cyclone and are screened by the underflow screen of the desander. The solid particles flow into the mud pool, and the filtered mud flows into the desander bin.
4. Four-stage mud purification process
After the three-stage purification, the drilling fluid enters the desilter under the pressure of the slurry supply pump of the desilter, passes through the high-pressure swirling flow of the desilter cyclone, and the effective mud enters the desilter bin, and the solid is 15-47um. The phase particles flow out from the drip nozzle of the desilter cyclone and are screened by the underflow screen of the desilter. The solid phase particles flow into the mud pool, and the filtered mud flows into the desilter bin.
5. Five-stage mud purification process
The drilling fluid after four-stage purification enters the drilling fluid centrifuge under the action of the centrifuge slurry supply pump. Under the action of the high-speed operation of the centrifuge, centrifugal force is formed, and the 5-15um solid phase particles are discharged through the slag discharge port. , The drilling fluid less than 5-15um flows into the centrifuge bin to continue recycling.
Under normal circumstances, the five-stage purification is carried out at the same time. If only one or a few of the purifications are carried out, these one or several mud purifications can also be carried out when the drilling fluid drilling operation requires. After the drilling fluid evolution is completed, the next step of drilling fluid circulation can be carried out.
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