FR2770578A1 - Continuous removal of solids from drilling waste to allow recycling - Google Patents

Abstract

The device uses a closed circuit in pressure and vacuum, acting continuously in a recycling unit containing a permanently rotating sieve, a layer of air under pressure and enclosed in a flask (1). Waste is pulled through the sieve under vacuum and solid is cleared from the sieve by air under pressure on the other side. The flask contains a V-shaped support (2) with two sealed joints allowing the pressure in the body to be maintained. A seal kit is fixed by two rings to maintain the pressure in the body. To purify the waste, the device contains a 300 micron rotating sieve, a larger sieve and a perforated flat round support fixed to a drive shaft, allowing the sieve to turn constantly and the waste to pass through the sieve to be recycled, due to the vacuum made by a vacuum pump. A layer of air under pressure blowing on the opposite side of the sieve eliminates the solids continuously.

Description

 The present invention relates to a device for removing solid matter from the mud used in drilling.

 The removal of solids from the mud is traditionally carried out by the combination of vibrating screens and hydrocyclones operating discontinuously with a heavy and bulky side.

 The device according to the invention overcomes these drawbacks because it operates in a closed circuit with space-saving equipment, therefore easily manageable in terms of transport, installation and operation.

 According to the technical design of this invention, the pressure in the casing at the inlet of untreated sludge (4) and in the evacuation farter with clean mud depression (io) is maintained by seals (5 / 7/2).

 The operating principle consists in feeding the untreated sludge inlet casing (4) by a pump or by gravity.

 Thanks to the vacuum created by a vacuum pump (preferably ano-liquid) connected to the outlet of the casing (lu), the clean mud is sucked continuously by its passage through a round sieve in rotation of about 300 microns ( 15) itself driven by a variable speed reduction motor (12).

 Side opposite to the rotating round screen (15), the compressed air is projected with an air knife (11) blowing through the screen (15) by removing the film of solids deposited on the screen (15) side d arrival of the mud.

 The solid materials are conveyed by a casing (D) directly into a container.

 This new system technically forces all of the mud to pass through the screen (15), therefore, the quality of the mud is regular and can be modified by replacing the screen.

The accompanying drawings illustrate the invention
++ Figure 1 shows - in profile and front view (1) the flange located on the mud feed side, fitted with 4
fixing holes and 3 adjusting screws for the seal ring located
around the rotating round sieve.

(2) the V-shaped support - with rubbers - allowing the evacuation of
solids, thanks to the compressed air injected by the air knife
(11) opposite side of the rotating round screen (15), while preventing
the introduction of mud into the material removal zone
solid.

(3) the housing allowing the transportation of solid materials in a
container.
t + Figure 2 represents - in profile and dc face
(4) the casing of the recycling unit with 8 fixing bolts.

 (5) the seal between the flange and the housing.

 (6) the untreated sludge inlet casing.

(7) the seal kit between the periphery of the round screen
in rotation and the recycling unit body.

 (8) the 2 rings for fixing the seal.

 (9) the pressure control manometer.

(9 bis) the vacuum control manometer (empty).

++ Figure 3 shows - in profile and front view
(10) the flange located on the side of the clean mud discharge by
a housing provided with 4 fixing holes.

 (11) the solid matter ejection air knife.

(12) the drive motor equipped with a reduction gear and a variator
mechanical gears.

+ Figure 4 shows - in profile and front view
the rotating round sieve.

 (13) the 8 mm ss perforated support with its fixing pin.

(14) the intermediate sieve with 3 mm opening (15) the main sieve with 0.300 mm openings - i.e.
300 microns.
t + Figure 5 represents - in profile section
the whole invention of the new recycling unit.

The device according to the invention, operating in CIRCUIT FER52
is inexpensive, easily achievable, in non-limited dimensions
tatives, mainly intended for recycling mud in boreholes,
but can be used in other areas.

Claims (5)

 1) Device for removing solid matter from the sludge used during drilling, characterized by a closed circuit, in pressure and vacuum, operating continuously in a recycling unit body (4) equipped with a screen in permanent rotation (15 ), a pressurized air knife (11) and enclosed on each side by a flange (1 and 10).  2) Device according to claim 1, characterized in that the flange (1) comprises a V-shaped support (2) equipped with 2 seals making it possible to maintain the pressure in the body (4).  3) Device according to claim 1 characterized by a bone seal kit (7) fixed by two rings (8) to maintain the pressure in the body (4).  4) Device according to claim 1 characterized in that, for the purification of the mud, it is equipped with a rotating screen of about 300 microns (15), a significantly larger support screen (14) and a perforated and flat round support (13) with its fixing axis for drive, allowing the screen to rotate continuously and the mud to pass through the screen (15) and to be recycled, thanks to the vacuum caused by the pump empty.  5) Device according to claim 1 characterized Far a pressurized air knife (11) blowing opposite side to the screen to remove solid matter continuously