SU1000116A1 - Method of automatic control of drilling mud cleaning process in hydraulic cyclone - Google Patents

Description

The invention relates to methods for regulating the mud cleaning process in a hydrocyclone and can be used in the purification of suspensions, for example, in drilling wells.

A known method of regulating the process of desliming slurry in a hydrocyclone by adjusting the size of the hydrocyclone sludge hole according to the concentration of the solid phase of the suspension. L The disadvantage of the known method is that it does not take into account the dependence of the hydrocyclone cleaning capacity on the viscosity of the initial suspension.

The closest approach to the proposed technical essence and the achieved result is the method of automatically controlling the process of cleaning the drilling fluid in a hydrocyclone by adjusting the flow rate of the condensed product depending on its density and the density of the original feed 12 1.

A disadvantage of the known method is that it does not take into account the influence on the quality of cleaning of the counter-pressure values on the discharge pipe of the hydrocyclone and the pressure on its inlet pipe. As a result, drilling fluid losses will increase. The purpose of the invention is to improve the quality of cleaning and reduce losses. drilling mud.

The goal is achieved by additionally changing the feed consumption according to

tQ on the ratio of inlet pressure, hydrocyclone and pressure at its discharge nozzle, and the discharge flow rate varies depending on the density of the initial hydrocyclone feed and

15 pressure on its pipe connection.

The drawing shows a schematic diagram of the system; Realizing the method of automatic control of the drilling mud cleaning process

20 in a hydrocyclone.

The method is carried out as follows.

Initial feed (mud suspension enters the hydro

25 cyclone 1. PO to pipeline 2. The density of the initial power supply is monitored by density sensor 3. The hydrocyclone 1 is drained through the drain pipe 4 and is regulated by

30 valve 5; Sludge Density Controls

Route 6 density sensor. The initial power output is controlled by the valve 7, and the pressure at the inlet to the hydrocyclone 1 is measured by a pressure gauge 8, the flow rate of the initial power in the hydro cyclone 1 is measured by a flow meter 9. The output signal of the pressure gauge 8 is fed to the first input of the regulator 10 / ratio, to the second input of which the output pressure gauge signal 11, and pressure value of c. the discharge nozzle 4. The condensed product is unloaded from the hydrocyclone 1 through the sludge nozzle 12J, while the flow rate of the condensed product is measured by the flow meter: 13, the output signal of which goes to the first input of the control unit 14 / the second input of the control unit receives the output signal of the density sensor 6, and on the third input - the output signal of the flow meter 9.

Depending on the density of the original drilling fluid, controlled by the density sensor 3, the setting unit 15 of the cleaning degree produces the task of the optimal cleaning degree. In particular, for optimal drilling muds, the optimal value of the reduction is in the range of 0.25-0, and ds of the desired value is 1.9 0.35-0 ,. The reference signal is compared in the adder 16 with the actual pressure signal at the drain nozzle 4, which is measured by the sensing element 17 of the pressure gauge 11. The error signal from the adder 16 enters the amplification and conversion unit 18, which together with the actuating unit 19 of the valve 5 performs the signal maintaining in the process of optimal pressure on the drain pipe 4.

Maintaining minimal loss of drilling fluid through the sludge port 12 Is carried out as follows.

The signal of the current density value of the slurry Pc1, monitored by the density sensor 6, is fed to the adder 20, compared with the signal of the current density value of the initial solution from the density sensor 3. The following ratios are maintained: h,

Psh (03-0,4) g / cm + Uzh for fwcx 1.9 g / am or Ush (0.4-0, b7g / cm + + pex for original 7 19 g / cm.

The output signal of the adder 20 is fed to the input of the predator 21 loss of the solution, which acts through the amplifier-conversion unit

22 and the execution unit 23 to the slurry pipe 12.

To maintain a predetermined ratio between the pressure gp on the drain pipe 4 and the pressure on the inlet pipe 2P, the output signal of the ratio controller 10 through the amplifier-converter unit 24 and the executive unit 25 are fed to the input of the valve 7, which changes the flow rate of the initial power supply in the hydrocyclone 1 .

The ratio controller 10 maintains the ratio

ROL. (0.08-0, for .jjEl, 9 g / s or Pc (0.11-0.14) P yes e; 1.9 g / cm; Control unit 14 allows process personnel to quickly assess the costs of the original product and thickened sludge, as well as in terms of the density of the latter, the loss of drilling mud.

The present invention allows to improve the quality of the purified drilling mud to the boundary grain of minus 20 microns. This increases the rate of penetration of the well and reduces the time it takes to build it. At the same time, the loss of drilling mud is reduced. This results in a reduction in the consumption of chemicals, as desired. The reduction in the volume of the solution discharged to the dump also has a favorable effect on environmental protection. The economic effect will be approximately 10,000 p.

Claims (2)

1. USSR author's certificate number 492310, cl. B 04 C 5/16, 1973. 2. USSR author's certificate No. 484004, cl. B 03 B 13/00, 1973.