RU2023871C1 - Method and device for simultaneous separate exploitation of seams - Google Patents

Abstract

FIELD: oil industry. SUBSTANCE: method is based upon testing production of seams for paraffin presence. Production of pure seam (paraffin free) is directed completely onto walls of perforated part of seam production string through centrifugal guiding mechanism which has paraffin, and the seams are mixed. After than mixture is advanced onto top surface. Device has well pumps suspended on string of depth-pump rods in string of pump-compressor tubes. The latters are mounted inside production string equipped with packers. Device has connecting pipe-line which communicates with annular cavity formed between branch pipes. The branch pipes and blades form centrifugal guiding mechanism. Branch pipes have hubs in their lower part under the lowest packer. EFFECT: improved exploitation capability; improved efficiency. 2 cl, 4 dwg

Description

 The invention relates to the oil industry, and in particular to the technique of simultaneous separate operation of two or more layers of the continental shelf, the wells of which in some layers contain paraffin.

 A known method for the simultaneous deep-pumping operation of two layers of one well, comprising sequential operation from bottom to top bypassing one layer into another and raising products to the surface [1].

 The disadvantage of this method is that if there is paraffin in one layer, then with clean oil, and even with an elevated temperature, the second layer allows paraffin to deposit on the walls of the well and block it (prototype for the method).

 A device for the simultaneous separate operation of two layers of the same well [2], consisting of columns of deep sucker rods and tubing, a packer, upper and lower deep pumps with drive mechanisms, a pipeline for adding liquid from the upper to the lower pumps installed in production casing.

 The disadvantage is that this device is not intended to prevent paraffin sedimentation on the walls of the production casing (prototype for the device).

 The aim of the invention is to increase the efficiency of the method by preventing the deposition of paraffin on the walls of a multilayer well.

 To do this, in the method, the formation is preliminarily investigated and the formations are identified, the products of which contain paraffin and without it, after which the products of the latter are completely sent to a centrifugal guiding mechanism with access to the production casing walls and mixed with the products of the formation containing paraffin, then the mixture is sent to surface.

 The device includes deep-well pumps with drive mechanisms hanging on a string of deep-well sucker rods in a string of tubing installed in the production string, packers and a connecting pipe placed therein. The device is equipped with a centrifugal guide mechanism mounted on the end of the tubing string and made in the form of two nozzles concentrically arranged relative to one another with sockets in the lower part forming an annular cavity between them and inclined vanes installed in it, while the annular cavity of the guide mechanism communicated with the connecting pipe, and the nozzle sockets are located below the lower packer, which ensures the direction of clean oil at the perforation holes of the formation, containing paraffin in oil to prevent deposition of the latter on the walls of the well.

 In FIG. 1 shows a device for implementing the proposed method; in FIG. 2 - sectional view of a centrifugal guiding mechanism (the movement of formation products with paraffin is shown by a dashed line, without paraffin - by a dash-dotted line, and of a mixed flow - by solid lines); in FIG. 3 is a section AA in FIG. 2; in FIG. 4 - scan of the cylinder.

 The method of simultaneous separate operation of the reservoirs is as follows.

 Consecutive operation is carried out from top to bottom by transferring the products of one formation to another and raising the products to the surface, pre-conducting a study of the formations and identifying the formations, the products of which contain paraffin and without it, after which the products of the latter are completely sent to a centrifugal guiding mechanism with its exit to the walls of the production string and mixed with the production of a formation containing paraffin, and then the mixture is directed to the surface.

 A device for implementing the method consists of lower 1, middle 2 and upper 3 deep pumps suspended on a string of deep-well rods 4 in a string of tubing 5, lowered into a production casing of a well 6 and driven by drive mechanisms (not shown).

 The pump 2 consists of a casing support 7, a casing sleeve 8, where the cylinder 9 of the pump is mounted, on top of which a pressure valve 10 is connected, connected by a pipe 11 to the lower layer. A suction valve 13 is installed in the plunger 12, connecting it through a slot in the plunger and an opening 14 in the housing with the middle layer.

 The cavities of the upper 3 and lower 1 pumps are communicated in the tubing 5 by an opening 15 located in the housing of the pump 2. There are packers 16 and 17 that separate the seams, which are also located in the production casing.

 A centrifugal guide mechanism 18 is mounted on the end of the tubing and consists of inclined vanes 19 located in the annular cavity in communication with the connecting pipe 11 and formed by concentrically arranged nozzles 20 and 21. The latter end with nozzles in the lower part located below the lower packer 16 .

 The device operates as follows.

 During the downhole installation, the liquid from the pump 2 through the pipe 11 of the middle layer with paraffin-free oil or high-temperature oil is completely fed through the pipe 11 to the centrifugal guide mechanism 18, then to the receptions of the lower pump 1, the last of which is already diluted with a small amount of liquid paraffin through the hole 15 is sent to the upper pump 3, and from it through a subsea well and a pipeline (not shown) to the collection point.

 An advantage of the invention is that paraffin clogging of columns and pipelines of subsea wells is prevented, there is no need to repair them due to the difficulties of its implementation under the conditions of the seabed, under water.

Claims (2)

 1. The method of simultaneous separate operation of the formations, including their sequential operation from bottom to top by transferring the products of one formation to another and raising the product to the surface, characterized in that, in order to increase the efficiency of the method by providing the ability to prevent deposition of paraffin on the walls of a multilayer well, a study is preliminarily performed strata and reveal strata whose products contain paraffin and without it, after which the products of the latter are completely sent to centrifugal a guiding mechanism with the exit of its production casing wall and mixed with the production of a formation containing paraffin, and then the mixture is sent to the surface.  2. A device for the simultaneous separate operation of the reservoirs, containing deep-well pumps, with drive mechanisms, suspended on a string of deep-well rods in a string of tubing installed in the production string, packers and a connecting pipe placed therein, characterized in that, with the purpose of increasing the efficiency of the device by providing the ability to prevent deposition of paraffin on the walls of a multilayer well, it is equipped with a centrifugal guide mechanism mounted on the end of the tubing string and made in the form of two nozzles concentrically arranged relative to each other with sockets in the lower part forming an annular cavity between them and inclined vanes installed in it, while the annular cavity of the guide mechanism is in communication with the connecting pipe, and the nozzle sockets are located below the bottom packer.

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