Spiral sand removing machine

Abstract

A spiral sand removing machine capable of removing harmful solid phases in drilling fluid is characterized in that a feeding box is installed on a base, an overflow pipe and a stirrer motor are installed on the upper portion of the feeding box, and a feeding pipe and a sand discharging pipe are installed on the lower portion of the feeding box and connected with the spiral sand removing machine. The spiral sand removing machine is structurally characterized in that a spring supporting vibration frame is mounted on a base; a central shaft is mounted on a vibrating frame as a feeding pipe, bearing seats and eccentric wheels are mounted at two ends of the central shaft, a spiral screen pipe is mounted in the middle of the central shaft, and a driving motor is mounted below the eccentric wheels to drive the eccentric wheels, the central shaft and the spiral screen pipe to rotate to generate centrifugal force and vibrating force to throw drilling fluid out of a screen to flow into a circulating tank; and harmful solid phases and drilling cuttings are discharged out of the spiral screen pipe and are discharged into the sand setting tank. The technical requirement of purifying the drilling fluid is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of petroleum engineering drilling fluid sand removal equipment, especially spiral sand removing machine capable of removing harmful solid phase in drilling fluid. BACKGROUND

[0002] Currently, the known drilling fluid sand removal equipment is mainly plane vibrating screen, which is mainly composed of base, screen box, screen mesh, spring and vibrating motor; the sand removal mode and process are as follows: during drilling, drilling fluid returns from well bottom to well head, flows into vibrating screen box, and then flows into circulating tank through screen mesh; drilling cuttings in drilling fluid flow out of screen box and are discharged into sand settling tank; the defect is that when drilling mudstone formation, mud sticks to screen mesh, and mud blocks and drilling cuttings are accumulated on screen mesh to block the passage; drilling fluid flows into sand settling tank over screen mesh, resulting in that a large amount of drilling fluid and drilling cuttings are mixed again to form waste mud; a large amount of funds is needed to purchase mechanical equipment and chemical agents to treat such waste mud, such as flocculant tank, agitator, conveyor, filter, extruder and loader; these devices expand the land occupation area of well site, prolong the drilling time, and affect the drilling engineering benefit. SUMMARY

[0003] In order to overcome the defect that mud sticks to screen mesh of plane vibrating screen in drilling fluid, resulting in that drilling fluid flows into sand settling tank and is mixed with drilling cuttings again to form waste mud, and affecting the progress of drilling engineering, the utility model provides a spiral sand removing machine, which can separate gas, liquid and solid in drilling fluid, concentrate mud, remove drilling cuttings, spin off water in drilling cuttings, discharge drilling cuttings into sand settling tank, prevent environmental pollution, and improve drilling speed and economic benefit.

[0004] The utility model solves the technical problems by the following technical scheme: a feeding box is installed on the base, an overflow pipe and an agitator motor are installed on the upper part of the feeding box, which crushes mud blocks in drilling fluid and solves the problem of sticking and blocking of screen mesh; a feeding pipe and a sand discharging pipe are installed on the lower part of the feeding box, mud is concentrated, liquid is separated and flows into circulating tank, concentrated mud and drilling cuttings are discharged into spiral sand removing machine, and harmful solid phase in drilling fluid is removed.

[0005] The structure of the spiral sand removing machine is as follows: a vibrating frame is installed in front of the feeding box, a spring is installed below the vibrating frame, a feeding steel pipe is installed on the vibrating frame as a center shaft, bearing seats and eccentric wheels are installed on both ends of the feeding steel pipe, a spiral screen pipe is installed in the middle of the feeding steel pipe, and a shield is installed around the spiral screen pipe.

[0006] A water outlet is cut on the center shaft (feeding pipe) to make mud flow into the spiral screen pipe for filtration; a driving motor is installed below the eccentric wheel to drive the spiral screen pipe to rotate, so that liquid flows into circulating tank through screen mesh, and drilling cuttings are discharged into sand settling tank.

[0007] The sand removing mode and process of the utility model is: in the drilling process, drilling fluid carries drill cuttings from the well bottom to flow out of the well head into the feed tank, a large amount of liquid floats up, the liquid level rises to flow into the circulating tank through the overflow pipe; the screening mesh filtering amount is reduced; the mud and drill cuttings in the drilling fluid flow into the spiral screen pipe through the sand discharging pipe, the motor is started to drive the spiral screen pipe to rotate, centrifugal force and vibration force are generated to throw the drilling fluid out of the screen mesh to flow into the circulating tank; the drill cuttings are thrown out of the screen pipe and discharged into the sand settling tank; the drilling fluid is purified, and the drilling technology requirement of not polluting the environment is reached.

[0008] The utility model has the advantages of improving the sand removing equipment and the sand removing efficiency, removing the harmful solid phase in the drilling fluid, and improving the drilling speed and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0009] The utility model will be further described below in combination with the drawings and examples:

[0010] Figure 1 is the utility model structure diagram

[0011] In the drawing: 1, base, 2, feed tank, 3, mixer, 4, eccentric wheel, 5, bearing seat, 6, motor, 7, vibration frame, 8, spiral screen pipe, 9, central shaft, 10, spring, 11, shroud, 12, sand discharging groove. DETAILED DESCRIPTION

[0012] The feed tank (2) is installed on the rectangle base (1), the overflow pipe and the agitator motor (3) are installed on the upper part, the feed pipe and the sand discharging pipe are installed on the lower part, and the spiral sand removing machine is connected.

[0013] The structure of the spiral sand removing machine is that the spring (10) is installed on the base (1) to support the vibration frame (7), the central shaft (9) is installed on the vibration frame (7), the bearing seat (5) and the eccentric wheel (4) are installed on the both ends of the central shaft (9), the spiral screen pipe (8) is installed in the middle of the central shaft (9), the shroud (11) is installed around the spiral screen pipe (8), the sand discharging groove (12) is installed below the sand discharging port, the motor (6) is installed below the eccentric wheel (4) to drive the spiral screen pipe (8) to rotate, centrifugal force and vibration force are generated to throw the liquid out of the screen mesh to flow into the circulating tank, the harmful solid phase in the drilling fluid is thrown out of the screen pipe to be discharged into the sand settling tank and transported to the treatment site.

Claims

1. A spiral sand separator, characterized in that: in A feed box is installed on the base, with an overflow pipe and a mixer for crushing clay installed on the upper part, and a feed pipe and a sand discharge pipe installed on the lower part, connecting to the spiral sand separator. The spiral sand separator is characterized by: a spring-supported vibrating frame installed on the base; a central shaft serving as the feed pipe installed on the vibrating frame, with bearing seats installed at both ends, a spiral screen pipe installed in the middle, and an eccentric wheel installed at the rear end. A drive motor is installed under the eccentric wheel to drive the spiral screen pipe to rotate, generating centrifugal force to throw the drilling fluid out of the screen and into the circulation tank; and throwing the drill cuttings out of the spiral screen pipe and discharging them into the settling tank.

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