Overall layout of the solid control system
Release time: 2015/10/26 Ai Yi NewsViews : 1991
The overall layout of the solid control system is worthy of careful study. Because the performance and cleaning tasks of each device are fixed, they cannot replace each other, and the order cannot be reversed. The general layout and sequence of processes are shaker, deaerator, sand remover, desilter, centrifuge.
Drilling fluid shaker:
The drilling fluid with a large amount of cuttings (harmful solid phase) returned from the wellhead passes through the wellhead elevated vertical and horizontal drilling fluid tank (with a certain slope) under the action of gravity to the inlet of the vibrating screen of the first-stage purification equipment. The larger harmful solid phase particles are screened out and removed.
The purified drilling fluid obtained through the vibrating screen enters the grit tank of the drilling fluid purification tank. The suction of the deaerator vacuum pump causes a negative pressure in the vacuum tank, and the drilling fluid enters the deaerator under the effect of atmospheric pressure. The separated and separated gas is exhausted to the top of the derrick and evacuated, and the degassed drilling fluid is discharged into the second tank of the drilling fluid purification tank under the driving of the exhaust cavity rotor. When the drilling fluid does not contain gas, the deaerator can be used as a high-power drilling fluid agitator to keep the drilling fluid in the purification tank from sedimenting.
Drilling fluid sand remover:
The drilling fluid purified by the vacuum degasser enters the second chamber of the drilling fluid purification tank. The sand pump is used to pressurize the drilling fluid into the second-stage purification equipment sand remover, and the separation is performed again using the principle of swirling. Removal of harmful solid phases.
The drilling fluid purified by the sand remover is used to pressurize the drilling fluid into the desilter of the third-stage purification equipment, and it is separated again by the swirling principle to remove the harmful solid phase of 15 to 44 microns.
Drilling fluid desilter:
The three-stage purified drilling fluid still contains a large amount of harmful solid phases. When the drilling fluid is in a non-weighted state, two centrifuges are used in parallel to remove the harmful solid phases larger than 5um in the drilling fluid. The drilling fluid is discharged into the fifth compartment of the drilling fluid purification tank.
Drilling fluid centrifuge:
When the drilling fluid is aggravated, the centrifuge will not only remove the harmful solid phase, but also the weighting material barite in the drilling fluid. This will cause the specific gravity of the drilling fluid to decrease quickly and a large amount of material to be lost. In order to avoid aggravating the loss of materials and achieve the purpose of removing harmful solid phases, two centrifuges need to be used in series, that is, a medium-speed centrifuge is used as the first stage, and a high-speed centrifuge is used as the second stage. The medium-speed centrifuge's liquid supply pump is processed by the centrifuge from the weighted drilling fluid proposed in the drilling fluid tank. The processed drilling fluid enters the drilling fluid purification tank, and the discharged underflow (containing a large amount of barite) is discharged to the medium-speed centrifugation. In the special tank at the bottom of the machine, it is flowed into the second-stage high-speed centrifuge by a special slurry pump for re-separation. After the separation, the drilling fluid containing barite is returned to the drilling fluid purification tank to maintain stable drilling fluid performance; The separated harmful solid phase is discharged out of the system to achieve the purpose of purifying and maintaining stable drilling fluid performance.
Whether motor power, sand pump pressure and displacement are properly matched will also affect the normal performance of solid control equipment. At the same time, the drilling fluid solid control system should also be equipped with appropriate drilling fluid agitators, mud guns and other auxiliary equipment, including sedimentation tanks, drilling fluid additive tanks, suction tanks, and appropriate connection manifolds to adapt to chemical, dilution, and sedimentation. The need for processing methods. In some cases, although the performance of some solid control equipment is very outstanding, the best economic effect can only be obtained after several devices of the solid control system are correctly and reasonably matched with each other.