RU149458U1 - CAPILLARY PIPELINE FOR SUBMITTING CHEMICAL REAGENTS TO A WELL - Google Patents

Abstract

A capillary pipeline for supplying chemical reagents to the well, consisting of a polymer tube, a corrosion-resistant armored cover in the form of a steel tape and a pillow under the armored cover, characterized in that for high heat resistance, flexibility and long trouble-free operation in wells with various complicating factors, the selection of material in the manufacture of capillary the pipeline is carried out depending on the necessary heat resistance; the width of the used steel galvanized tape of the armored cover is 10-15 mm and the thickness is 0.3-0.5 mm, which increases the flexibility of the cable as a whole and reduces the load on the sheath when booking on tape reservation lines; To exclude damage during installation and dismantling operations at oil production wells and during operation of the capillary pipeline, the polymer tube is booked with a gap to compensate for thermal stresses, with an overlap of 30-50%, with an anti-seize profile of type “S” using elastic materials and the manufacture of thin-walled products, or type "Z" when using more rigid materials and the manufacture of thick-walled products.

Description

The utility model relates to equipment for the oil industry and is intended to protect downhole equipment from corrosion damage, asphalt-resin-paraffin deposits, scaling, as well as to conduct operations to increase oil recovery.

The current state of the raw material base of the oil industry in Russia is characterized by a significant deterioration in the structure of oil reserves. Hard-to-recover reserves occupy an increasing share in their structure, the extraction of which is complicated by various factors, both natural and arising in the development process. Under these conditions, the efficiency of field development can be ensured only if highly effective technologies for impacting the well and reservoir are applied.

One of the developers' tasks is to improve domestic heat-resistant downhole equipment for thermal methods of oil production and its adaptation for use in high-viscosity oil fields.

Known capillary pipeline for supplying chemicals to the well, including a polymer tube braided in two layers by wire winding, characterized in that the outer layer of wire winding is made continuous, and with a gap between the wires exceeding the diameter of the wire winding. (RF patent No. 62160, published. 03/27/2007).

Known capillary pipeline provides the necessary reagents to the well, sufficient flexibility of the capillary pipeline, however, does not provide the necessary highly reliable mechanical protection of the capillary pipeline and work in high temperature conditions in the well.

A known method of chemical protection of downhole equipment from corrosion, paraffin deposition, scaling and sulfate-reducing bacteria, including a dosed supply of a chemical reagent. The controlled dosed supply of various types of chemical reagents is carried out simultaneously or sequentially at various predetermined depths depending on the technological and technical features of the operation of the well. Reagents are fed through a capillary hose consisting of three capillary tubes, a protective pillow and armor. The adjustment of the flow of reagents is carried out at the wellhead by the installation of a metering electric pump, (RF patent No. 2260677, published on 08/20/2001)

The known method can ensure the delivery of three reagents into the well in different zones of complications at the required intervals for each tube, however, it does not work in conditions of high temperature in the well and is expensive.

The closest analogue to the proposed utility model by technical nature is an armored, capillary tube for supplying chemicals to the annulus of a well, consisting of one or several parallel-laid capillary tubes, on which a cushion is applied in the form of a winding with tape material and general armor made of steel tapes having a corrosion-resistant coating, or made of corrosion-resistant steel, (RF patent No. 63861, published June 10, 2007)

The known method provides the delivery of the necessary reagents to the well, however, it does not work in conditions of temperature in the well of more than 120 ° C.

The technical task to be solved is the development and creation of a universal capillary pipeline for supplying chemicals to the well, which has high heat resistance, flexibility and long trouble-free operation in wells with various complicating factors.

Achievable technical result consists in the use of materials from polyethylene to fluoroplastic, depending on the necessary heat resistance, determining the width of the used armor tape, determining the width of the used fabric for a protective pillow, manufacturing method.

The specified technical result is achieved by the fact that the capillary pipe is manufactured using high density polyethylene (including radiation-modified polyethylene), a propylene composition resistant to oil and high temperature, thermoplastic elastomer, fluoropolymer, which can be operated at temperatures from -50 ° C up to + 250 ° C, by booking a capillary pipeline on special equipment with galvanized steel tape from 10 to 15 mm wide and from 0.3 to 0.5 mm thick, depending on the required characteristics, with an anti-seize profile of type “S” or “Z” (FIG. 2, FIG. 3) to prevent damage during tripping operations in wells.

The selection of the thickness and width of the tape armored cover, as well as the applicable overlay profile (Fig 2, Fig 3) is carried out in order to prevent damage to the walls of the pipeline and reduce the inner diameter (clearance) when booking, depending on:

- on the diameter, wall thickness and physical properties (elasticity, hardness, etc.) of the capillary pipeline;

- technical capabilities of equipment for tape reservation of a polymer pipeline (available equipment, optimal booking speed, etc.);

- from the physical properties of the material of the tape armored cover (elongation, tensile strength, etc.);

The application of armor cover with profile “S” according to FIG. 2 is applied on elastic, thin-walled products and products with a small diameter.

The application of armor cover with the profile “Z” in FIG. 3 is used for more rigid products, products of larger diameter.

Signs of a utility model are:

1. The manufacture of a cylindrical tube with an inner diameter of 3 mm to 10 mm, with a wall thickness of 0.5 to 3 mm;

2. The manufacture of a cylindrical tube by continuous extrusion;

3. Selection of material depending on the permissible temperature of use:

4. Reservation of the cylindrical tube on special equipment with tape made of corrosion-resistant alloys with a thickness of 0.3-0.5 mm. Furthermore, the width of the steel tape used is 10-15 mm. This increases the flexibility of the capillary pipeline as a whole and reduces the load on the shell when booking on a tape reservation line;

5. The application of an armor plate with profile “S” according to FIG. 2 when using elastic materials, manufacturing thin-walled products and products with a small capillary diameter to exclude damage during tripping operations in oil production wells;

6. The application of an armor plate with a profile “Z” according to FIG. 3 when using more rigid materials and manufacturing products with an increased capillary diameter to exclude damage during tripping operations in oil production wells;

7. selection of the necessary parameters of the capillary pipeline and materials for its manufacture, depending on the required characteristics:

8. Applying armor cover over a pillow made of a non-woven fabric (or glass tape and other materials, depending on the temperature index of the applicable tube material) with a gap to compensate for thermal stresses arising from heating of the tube material during operation, and to increase the reliability of the capillary pipeline when it is used in formation fluid at elevated temperatures;

9. armor cover, in the form of a metal tape with an anti-seize profile, is placed on a protective pillow with an overlap of 30-50%.

Signs 1-2, 8-9 are common with the prototype, signs 3-7 are essential distinguishing features of a utility model.

Utility Model Essence

The late stage of development is characterized by the need to carry out work to eliminate possible complications associated with changes in the structure of reserves towards hard to recover and the need to carry out increasing volumes of work on the impact on productive formations in order to increase oil recovery.

When operating oil fields using thermal methods, especially in those fields where other methods are ineffective, for example, in highly viscous oil fields, there is a problem of using equipment that can operate under high temperature conditions for a long period without interruptions and accidents.

The conditions for the development of deposits at a late stage, in addition to the use of thermal methods, may differ in large curvature of wellbores.

For example, when developing the Ashalchinskoye high-viscosity oil field, there is a need for intense borehole bending, associated with a 90 ° zenith angle in the reservoir at a depth of only 100-105 m vertically, as well as using the construction of “through” horizontal wells with bottom faces day surface.

The large curvature of the wells presents special requirements for the design of equipment.

The proposed model solves the problem of increasing the heat resistance and flexibility of the capillary pipeline by selecting heat-resistant material, the width and structure of the armor cover, as well as the manufacturing method.

When developing an oil reservoir, water is pumped through injection wells and oil is taken through production wells. A unit with an electric motor and an ETsN5-125 × 1400 pump on a tubing with a length of 1000 m was lowered into a production well DN1 with a depth of 1250 m. The production rate of a production well after the installation was run was 130 m ³ / day. However, due to intensive scaling on the working bodies of the ESP, the well production rate gradually decreased, the overhaul period of the installation was 8 months. To increase the overhaul period and oil production, a unit with a capillary pipeline 990 m long was launched for targeted delivery of a scale inhibitor in a cyclic mode during the pump drain interval.

In FIG. 1 shows the construction of a capillary pipeline for supplying chemicals to the well.

1. Polymer pipeline;

2. Pillow under the armor cover

3. Armor made of steel corrosion-resistant tape.

The use of the proposed cable will allow us to solve the problem of increasing the overhaul period of production wells, the operation of which, in addition to accumulation of salt deposits, asphalt-resin-paraffin deposits, etc., is complicated by the influence of high temperatures and large curvature of the borehole.

Claims (1)

A capillary pipeline for supplying chemical reagents to the well, consisting of a polymer tube, a corrosion-resistant armored cover in the form of a steel tape and a pillow under the armored cover, characterized in that for high heat resistance, flexibility and long trouble-free operation in wells with various complicating factors, the selection of material in the manufacture of capillary the pipeline is carried out depending on the necessary heat resistance; the width of the used steel galvanized tape of the armored cover is 10-15 mm and the thickness is 0.3-0.5 mm, which increases the flexibility of the cable as a whole and reduces the load on the sheath when booking on tape reservation lines; To exclude damage during installation and dismantling operations at oil production wells and during operation of the capillary pipeline, the polymer pipe is booked with a gap to compensate for thermal stresses, with a 30-50% overlap, with an “S” type anti-seize profile using elastic materials and the manufacture of thin-walled products, or type "Z" when using more rigid materials and the manufacture of thick-walled products.

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