METHOD AND DEVICE FOR ELECTRICALLY-CONTROLLED PACKER INSTALLATION Russian patent published in 2006 - IPC E21B33/12 

FIELD: well building and operation equipment, particularly to perform cased well testing, for instance during pressurizing thereof.

SUBSTANCE: device comprises body with power shaft adapted to receive fixing rams and rubber sealing member tightened with bearing sleeve having nut, as well as electromechanical drive of power shaft made as electric drive and planetary reduction gear. Device also has power shaft movement detecting sensor and pressure sensors connected with control panel. Planetary reduction gear comprises four stages and is provided with torque-limiting clutch arranged between the second and the third stages. Outer gear wheel of the first, the second and the forth planetary reduction gear stages is fixed in the body. Outer gear wheel of the third stage is loosely installed. Power shaft has guidescrew and nut connected to the forth reduction gear stage. Sliding rams are installed on intermediate support, which is spring-loaded relatively the body and bearing sleeve. Partition is installed in lower body part. Power shaft may be fixed relatively the partition by means of dowel. Shaft movement detecting sensor is arranged in chamber defined by the partition and body walls. The first pressure sensor communicated with over-the-packer area is installed in lower body part. The second pressure sensor communicated with under-the-packer area is arranged in axial channel made in power shaft to communicate thereof with well medium. The body may be filled with oil and provided with hydrostatic pressure compensator. Corresponding extensions may be formed on replaceable ends of outer gear wheels of the third and the forth planetary reduction gear stages. Movement detecting sensor may be connected to power shaft by movable contact means and electrically linked to control panel. Intermediate support may have inclined guiding means to guide sliding rams, which are spaced along a circle so that 120° angles are defined in-between. Upper sliding rams are offset 60° from lower ones along a circle. Outer surfaces of lower body end and bearing sleeve extend at an angle to instrument axis normal. The angle is equal to angle of intermediate support guiding means inclination to instrument axis and is not less than 6°. Space between bearing sleeve and shaft may be sealed with sealing ring. Axial channel in lower part of power shaft may be connected with radial hydraulic channel communicated with over-the-packer area. Method for packer installation involves lowering packer to predetermined interval; pushing out fixing rams and compressing sealing member of the packer with the use of electromechanical drive. Electromechanical drive comprises electric engine and power shaft kinematically connected with rams and sealing member. Packer installation is accompanied by recording of electric engine load current, power shaft movement amplitude and direction, as well as pressure in over-the-packer and under-the-packer areas. Above data are recorded as diagrams. Degree of sealing member compression is determined from electric engine load current change. Packer air-tightness can be inferred by pressure drop value.

EFFECT: increased efficiency of packer installation control, reduced accident risk.

9 cl, 7 dwg