SU895171A1 - Apparatus for recovering solid phase from drilling mud - Google Patents

Description

The invention (carried away to the field of cleaning, and in particular to the disposal of drilling mud, and can be used in the oil, gas and exploration industries.

An electrophoretic device is known for extracting a solid phase from a mortar solution, comprising a body, which is the cathode in which the drilling fluid circulates, and a cathode placed in it — a rotating drum, from which the settled particles are displaced by Cl D scrapers.

The disadvantage of the device is the loss of 15 parts of soluble substances in the thickened drilling mud.

Closest to the invention is a device for separating a solid phase from a drilling mud, comprising a housing with holes for introducing and draining fluid, connected to a negative pole, a positive electrode placed in the housing and a me-. kanizm for transporting solid phase C 2} .25

The disadvantage of the device is the incomplete extraction of particles of the solid phase from the solution and unproductive periodic operation of the device.

The aim of the invention is to provide a more complete extraction of the solid phase from the drilling fluid.

The goal is achieved by the fact that the bottom of the body is perforated and the positive electrode is floating, and the mechanism for transporting the solid phase is made in the form of a screw of a dielectric material.

The drilling fluid coming from the well and containing in its Q slurry, the useful solid phase (fine clay particles, ut desired), the dispersion medium, usually consisting of water and dissolved salts (monomolecular ions), and high molecular weight chemical reagents (stabilizers) - polyelectrolytes, are first cleaned in order to remove loose rock particles, sludge, from it. , „

Then the solution is treated in the area of the negative electrode of the electrochemical system, which ensures the absence of penetration of the products of electrochemical reactions, which flow in the area of the positive electrode, into the drilling fluid. This allows. increase the concentration of free hydroxyl groups, complexes, and hydrated electrons in the drilling fluid. These particles are adsorbed on the interfacial surfaces formed by polyelectrolyte molecules and particles of the solid phase with the dispersed medium of the drilling fluid.

The cleaned drilling fluid enters the solid phase separation device from the drilling fluid, the capacitance of which is the cathode, and the anode is a continuously pumpable electrically conductive fluid separated from the mass of the drilling fluid by a permeable dielectric barrier. The bottom of the tank is made in the form of a conductive grid.

As a result of the emergence of powerful electrostatic forces. repulsion between particles that make up the drilling fluid, its layers move relative to each other with less internal friction (viscosity decreases), and water, which has been rigidly retained at the surfaces of the Phase section, due to dipole-dipole interaction, hydrogen and donor-acceptor bonds, acquires a large mobility in a dv with a unipolar (negative charge on the surface of the dispersed phase. (including the surface of polyelectrolyte molecules). Therefore, a wire from the drilling fluid under the influence of gravitational forces iltruets through the conductive grid, dehydrating the drilling fluid.

The negatively charged grid, through which water is removed from the drilling fluid, contributes to its continuous and intensive selection, since it repels negatively charged clay particles from its surface and thus prevents the formation of a slightly permeable filter cake. In addition, the charged network does not allow the negatively charged macromolecules of polyelectrolytes to leave with the water and the low molecular weight compounds contained in it from the solution level. As a result of the dewatering process, a paste is formed in the vessel, where the drilling fluid is mixed, consisting of useful solid matter and high molecular weight activated chemical reagents.

A device that acts as a node that does not exert on the drill 389 a solution of the coagulating effect of the products of electrochemical reactions coming from its surface is a dielectric hollow body floating on the solution surface with a bottom also made of a dielectric porous material (tarpaulin, porous fluoroplastic etc.) and the positive electrode 1 placed inside it is graphite, metal). The electrolytic switch that closes the circuit is a water-conducting solution that is pumped through the pump in a closed loop. Thus, the contact between the anode and the solution is made by means of a liquid electrolytic bridge electrolyte - a solution formed in the zone of their separation by a porous dielectric wall. The paste obtained in the tank after dewatering can be dried or sent to another object where drilling mud is needed. The drawing shows a diagram of a device for separating the solid phase from the drilling mud. The device contains a tank 1, a floating anode, a pump 3 for pumping a conductive fluid, a source of direct current k, a tank 5 for a conductive fluid, a tank 6 for drilling mud paste and a capacitor 7 for collected water. To push the formed mud paste into the vessel 1, a screw 8 is placed, the blades of which are made of a dielectric material, in order to preserve the electric field without distortion. The screw 8 is driven in rotation by the electric drive 9. The bottom of the tank is perforated in the form of a conductive grid 10 and through the case of the tank 1 is connected to the negative pole of the current source. Under the conductive grid 10, an inclined base plate 11 is placed for guiding the discharge of ssb. water. The body of the floating anode 2 is made of a floating porous dielectric material, and its bottom 1-2 is made of a mesh dielectric material, such as a tarpaulin or a perforated plastic film. In the cavity of the floating anode 2 there are placed underwater 13 and branch pipe 1 connected by flexible hoses 15 to a pump for pumping conductive fluid 3 and a container for conducting fluid 5. In the cavity of floating anode 2 there is also a positive electrode 16 made of metal or graphite, connected to the positive pole of the current source by means of a flexible current lead 17. A chute 18 is provided to feed the incoming drilling mud into the tank 1. The device works as follows .. Purified from cuttings particles drilling fluid through the chute 18 enters it-. bone 1. Simultaneously in the floating anode 2 s. The pump 3 establishes through circulation of the conductive fluid through the tank 5 with the current-conducting fluid and the outlet and supply pipes 13 and I, using flexible hoses 15, and the drilling fluid is separated from the conductive fluid by a dielectric net. When a direct current source is turned on, capacitance 1 in the tank creates an electric field formed by a cathode — a conductive grid 10 and a floating anode 2, in the cavity of which an electrode 16 is placed, connected to the positive pole of the current source by means of a flexible current lead 17. the screw 8 t with dielectric blades is driven by the electric drive 9 and pushes the resulting paste into the container 6. The water under the influence of the electric field is filtered through the grid 10 and through the sump 11 flows into water 7,

Claims (2)

1. A DEVICE FOR ISOLATING A SOLID PHASE FROM A DRILLING SOLUTION, including a container with holes for fluid inlet and outlet, “connected” to the negative pole, a positive electrode placed in the housing and a mechanism for transporting the solid phase, which differs in that in order to ensure a more complete extraction of the solid phase from the drilling fluid, the bottom of the tank is perforated, and the positive electrode is floating. 2. The device according to π.1, which entails that the mechanism for transporting the solid phase is made in the form of a screw made of a dielectric material.