Jet end piece for hydraulic sand jet perforator

IPC classes for russian patent Jet end piece for hydraulic sand jet perforator (RU 2247227):

E21B43/114 -

B05B1/34 - SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F0005200000; processes for applying liquids or other fluent materials to surfaces by spraying B05D)

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Jet end piece for hydraulic sand jet perforator / 2247227

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Method and device for secondary formation penetration / 2270331

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Method for secondary productive formation exposing by slot hydraulic jet perforation and well putting in operation / 2282714

Method involves performing full-waveform logging along with full wave signal recording in digital form; detecting place and number of cuts performed by hydraulic jet perforation along formation height. Bottomhole assembly includes hydraulic jet perforator, pressure test unit having socket for drop ball receiving, pipe string with measuring band connected to the first clutch and provided with cut marks, as well as reference connection pipe. Above components are arranged in bottom-up direction. Pipe string provided with equipment is lowered in well so that perforator reaches level of lower cut, which is the first from bottom. Then the first slot-like cut is formed in two stages by supplying abrasive liquid to perforator. At the first stage perforation is carried out under working pressure of up to 20 MPa for not more than 25 min. Just after that the second stage perforation operation is carried out under working pressure of up to 30 MPa for not more than 20 min. Above operations are fulfilled for each cut. After the last cut perforation channels of hydraulic jet perforator nozzles are closed and perforator valve assembly is opened. Slot-like channels are cleaned of sand. Perforator is lowered to well bottom and well is flushed until clean formation water appears. Then inflow stimulation liquid in injected into perforation interval and into area located 50-100 m over the perforation interval and repeated full-waveform logging of the inflow stimulation liquid is executed along with full wave signal recording in digital form. Perforator is lifted to day surface. After than immersed pump or equipment for flowing well operation are lowered in producing well or working agent injection equipment is lowered in injection well. Inflow stimulation liquid is removed from well bore and the well is brought into operation.

Method and device for fluid-containing reservoir isolation / 2312972

Method involves creating disc cavern in rock; filling the cavern with plugging composition; creating technological window within reservoir cap, wherein technological window height and width are calculated from equation; fully crushing casing pipe body; washing-out rock and creating at least 2-3 disc caverns within technological window interval; filling well bore and disc caverns with light-weight salt or aqueous solution; repeatedly filling total well bore volume and disc caverns with plugging solution; filling opened well bore and disc caverns with plugging solution at decreased flow rate of 0.5-3.0 l/sec along with upper casing pipe part shoe sealing and increasing pressure. Device comprises pump, guiding jet nozzles and valve ball. Guiding jet nozzles extend in radial direction and are uniformly distributed along total body circle in upper, central and lower horizontal planes of section thereof so that 3-6 nozzles are located at each plane. Device also has bypass channels communicating device interior with guiding jet nozzles. Jet nozzles are united in 2 alternately acting groups. Nozzles installed in central horizontal plane are directed in horizontal plane. Nozzles located in upper and lower horizontal planes spaced apart 0.15-0.5 m are inclined at 7-30° to horizontal plane. Device also has slide with additional valve ball installed in upper part thereof.

Hydraulic jet perforator / 2312979

Perforator comprises hollow body with outer depressions made as two mating planes. One plane has orifice communicated with body interior and adapted to receive jet nozzle. Hard-alloy deflecting plate is in another depression plane. Seat with shutoff member is formed in lower body part. The body has protective plates. Jet nozzles include outlets shaped as elongated conical members. The jet nozzles are installed in orifices by means of nozzle holders provided with conical sections projecting beyond body outline.

Mechanical-hydraulic perforator / 2316644

Perforator comprises hollow body with cylindrical groove in central part thereof, perforation piston with throttling channel and upper sub. Additional channel provided with piston is created in perforation piston. Piston is fixedly connected to the body and may block communication between throttling channel and body interior in initial position.

Set of well perforation devices / 2332562

Present invention relates to the oil and gas industry, namely to the well field. The set of devices for well perforation contains perforating gun sections connected between themselves, a casing, supporting and guiding components. The casing wall has horizontal tapered openings and protection rings coaxial with the horizontal openings. The cylindrical surfaces of the perforating gun section shells are furnished with through slots consisting of a conical part and a longitudinal part, so that the conical parts of the adjacent slots form a conical ledge. The shell has horizontal openings and a vertical axial opening, white the adjacent section shell ends have a flexible coupling attached thereto and consisting of a sphere and a shell assembled of two parts and encircling the sphere. The horizontal openings of the perforating gun section shells are connected to a compressed air feeding hose by a vertical opening.

FIELD: oil and gas industry.

SUBSTANCE: in end piece, flow conic slit-like channel of variable section is made screwed with rotation of longitudinal axis for angle 20-60°. Section at output is decreased in comparison to input in 1.5-3 times.

EFFECT: higher efficiency.

3 dwg

The invention relates to the oil and gas industry, and in particular to nozzles for guns using jet directed actions, and can be used in the technique of opening the reservoir to create channels and local gaps in wells with open bottom and lined exploitation columns, as well as for cutting casing, expansion faces in uncased wells and jet aimed acid and other treatments downhole zones with the purpose of intensification of oil and gas production.

Known design nozzles perforator, comprising a housing, made with channels for supplying a fluid cylinder with a nozzle channel tangentially inclined relative to the axis of the nozzle. The cylinder further comprises an annular channel, hydraulically connected to the channel for supplying the liquid and a nozzle channel [1]. However, the known design does not allow to achieve significant improvement in the efficiency of opening seams.

Closest to the proposed to the technical essence is the abrasive jet nozzle punch for opening oil and gas wells, comprising a housing and a flow conically channel of variable cross-section, made of the slit with the ratio of gap width to its length from 1/3 to 1/5, and with decreasing cross-sectional area of the outlet from which oseney input [2]. However, this attachment does not significantly increase the effective opening of productive layers.

The present invention is to achieve increased filtration area due to the destruction zone filtrate penetration and sedimentation in productive strata.

The problem is solved in that the proposed design of the nozzle abrasive jet perforator includes a housing in which a flow conically slit-like channel is screw with the rotation angle to its longitudinal axis in the range from 20 to 60°and the ratio of the squares of the output and input openings optimally in the range of 1:1.5 to 1:3.

Only this set of distinctive features: variable cross-section channel, the performance of its screw to ensure a given angle of rotation of the abrasive stream is in the range of 20-60° and reducing the sectional area of the slit channel output to the input in the optimal range of 1.5-3 ensures the achievement of objectives, namely: to minimize hydraulic resistance, respectively, by increasing the energy and penetrating power of the jet when breaking rocks. The changing flux vector under declare an angle in the nozzle changes and intensifies the hydrodynamics of destruction and vymyv rocks due to the exclusion of the counter nanogenerators and waste streams. Achieved multiple increase of the surface of the filter.

The invention is illustrated by drawings, where figure 1 shows a longitudinal section of the nozzle, figure 2 - a view A-a in figure 3 - view-Century

Nozzle perforator consists of a body 1 in which the channels 2 with conoidal part on the input, the transition to screw with the completion of the slit-like cross-section.

The nozzle hole punch works as follows. Abrasive flows through conically entrance channel in its screw part, where there is a change of the flux vector at an angle of 20-60°that intensifies the hydrodynamics of destruction and vymyv rocks. Rotation of the abrasive flow eliminates counter the imposition of attacking and waste streams of abrasive. At the same time is achieved by increasing the penetrating power of the jet due to better conservation of kinetic energy and the axial velocity due to the implementation of the flow channel slit of variable cross-section with a given reduction from input stream to its output.

The use of the proposed jet nozzles in the water punchers all things being equal with the other allows more perfectly to open layers, promoting good flow of oil, gas and condensate.

Sources of information taken into account:

1. USSR author's certificate No. 7325050, CL E 1 In 43/114 from 28.06.1977.

2. USSR author's certificate No. 211474, CL E 21 In 43/114 from 09.10.1965.

Jet nozzle for abrasive jet perforator for opening oil and gas wells, comprising a housing and a flow conically slotted channel of variable cross-section, characterized in that the channel is screw with the rotation angle to its longitudinal axis in the range of 20-60° with decreasing cross-sectional area of the output slot compared to the input in 1,5-3 times.