Jet end piece for hydraulic sand jet perforator

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.



 

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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

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