SU1548523A1 - Lift arrangement for deep-well unit - Google Patents

Abstract

A lifting device of a downhole installation comprising a shaft on which a screw is mounted, while the inner surface of the screw repeats the surface of the shaft, characterized in that, in order to increase the efficiency of lifting highly viscous bituminous oils in directional and curved wells, the shaft is designed as a flexible the rope, the screw consists of separate sections, which are divided along axial surfaces into longitudinal elements rigidly connected on a rope, and the sections themselves are fastened together with the possibility of bending one relative to Other, while at the end of the last section secured cargo. 1 il.

Description

The invention relates to pump construction and can be used in the recovery of high-viscosity oils from directional and deviated wells.

A device for lifting oil from wells is known, comprising an electric motor mounted on a surface, a column of lifting pipes and a submersible pump 1J.

The disadvantage of this device is that the pump is made centrifugal, the power of which is insufficient to lift viscous liquids.

It is also known to lift a borehole installation device containing a shaft on which a screw is mounted, while the inner surface of the screw repeats the surface of the shaft 2J.

However, due to the rigid design of the shaft and screw, the latter cannot

work in deep directional and curved wells.

The aim of the invention is to increase the efficiency of the recovery of highly viscous bituminous oils in directional wells.

This goal is achieved due to the fact that in the lifting device of the downhole installation containing the shaft on which the auger is installed, the inner surface of the auger repeats the surface of the shaft5 of the latter, is made in the form of a flexible rope, the auger consists of separate sections surfaces on longitudinal elements rigidly connected to the rope, and the sections themselves are fastened together with the possibility of bending relative to each other, with a load attached to the end of the last section.

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1 shows a device, a longitudinal section1, in FIG. 2 - screw longitudinal section; on fig.Z - section aa in figure 2.

The lifting device of the downhole installation comprises a shaft 1 on which a screw 2 is mounted, the inner surface 3 of the screw 2 repeating the surface 4 of the shaft 1. The shaft 1 is made in the form of a flexible rope 5, the screw 2 consists of separate sections 6, which are divided along the axial surface m on the longitudinal elements 7, rigidly connected to the rope 5, for example, clamps 8, and the sections themselves are fastened together with the possibility of bending relative to each other, while at the end of the last section 6 a weight 10 is fixed.

The screw 2 is placed along the entire length of the lifting pipes 11. The installation is equipped with an engine 12, a thrust bearing 13 and a seal 14. Sections

6 can be made of various materials, such as light metals and plastic alloys, etc. The rope 5 is fastened to the drive shaft 15 and section 6 among themselves, for example, by means of a splined joint 16.

The threading of the sections 7 of the screw 2 is made on the surface of the well during the descent process. To the rope 5 (Fig. 2), the longitudinally split elements 7 are rigidly attached by means of, for example, clamps 8. In the axial direction, sections 6 are interconnected, for example, by means of a spline connection 16. As sections 6 are attached to the rope is descended 2 (figure 1)

in the riser 11, previously lowered to a predetermined depth.

During the installation, the high-speed liquid is raised (transported) upward by rotating the flexible auger 6 (Fig. 1). The reservoir fluid enters the surface, is sealed by a seal 14, enters the consumer.

During operation of the installation, the flexible auger is subject to torque, axial forces, caused by its own weight and the rise of high viscosity oil. Axial forces are sensed by rope 5 (Fig. 2). In the process of stretching the rope 5, they are axially displaced along the spline joint 16. In the process of rotation, the rope 5 and section 6 are twisted as a single unit.

The main unit of the installation is a flexible screw 2. Its reliable operation determines the high performance of the entire installation.

High tensile strength of the screw 2 due to the use of a rope. The flexibility of the rope 5 (Fig. 2), the gaps in the spline joints 16 provide sufficient flexibility for the entire working element. Placing on the rope sections 6, rigidly connected, connected to it, allows to transfer relatively large torques to the flexible auger, necessary for lifting high viscosity oils from great depths.

The use of the invention will ensure high wear resistance of the flexible working element and tubing string.

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Claims (1)

LIFTING DEVICE OF A WELL-MOUNTING UNIT containing a shaft on which the auger is mounted, while the inner surface of the auger repeats along: the shaft surface, which differs _z e in that, in order to increase the efficiency of lifting high-viscosity bitumen oils in directional and curved wells, the shaft is made in in the form of a flexible rope, the screw consists of separate sections, which are divided along axial surfaces into longitudinal elements rigidly connected to the rope, and the sections themselves are fastened together with the possibility of bending one relative about the other, while at the end of the last section the load is fixed.