Device for productive formation treatment with propellant charge and bag

FIELD: oil and gas industry.

SUBSTANCE: device includes wire-line, unpackaged cylindrical propellant charge with igniter and accessories. According to invention the propellant charge is closed by rigid combustible bag that provides the reduction of charge deformation at high temperatures in well and generation of additional energy quantity. Rigid combustible bag consists of the following components, wt %: thermosetting polymer compound - 30…37; pyroxiline fibre - 18…22; explosive component - 42…48 and plus 100%: ethyl alcohol - 10, wetting agent - 0.1.

EFFECT: increase of device operation reliability at increased temperature influences.

1 dwg

 

We offer the downhole device is related to the oil and gas industry and can be applied in other areas. The basis of the device are solid fuel charges (TTZ). When combustion is thermal gas and chemical impact on the bottomhole zone of the formation to increase permeability and tributaries.

A method of processing reservoir and a device for containing the TTZ and the snap-in connection cable [1]. The method sets the characteristics of the pressure pulses when creating excessive pressure in the well. In the channels TTZ has the support tube with the ignition system.

Known planar sectional specification for gas-dynamic stimulation [2]. It includes powder section, the node ignition and accessories, located in the Central channel of each of the powder sections and details for tightening the sections to each other.

The presence of tubes with snap [1, 2], passing through the axis of the TTZ and other accessories provide a certain rigidity to the device. The disadvantage of this analogy is the deformation of the elements of the composite charge with long-term exposure to elevated temperature (up to +100°C). They become softer due to the sharp decrease in the elastic modulus. As a result, the ignition may be broken or have non-nominal modes of combustion, caused the destruction of a charge.

Known gas generator solid fuel with adjustable pulse stimulation [3]. He has a tubular TTZ and carrying geophysical cable with fastening elements of the design. Available TTZ protective coating provides burning them only with the Central channel. This leads to undesirable deformation TTZ caused by the increased pressure of the combustion products in the channel. The protective coating is not completely burned. It remains pollute the well after combustion TTZ.

The prototype is a device for processing a productive formation [4]. It has a frameless TTZ-through channel and the ratio of its length to diameter (22-38):1, which allows to use shorter with increased arch of the fuel. Such charges less deformed under high temperature. However, the risk of deformation remains. This limits the use of the device at these operating temperatures.

The task of the invention is such revision device specification, which will increase the reliability and efficiency of its operation at high temperature effects by reducing deformation of the charges and save the form when placing them in a rigid combustible Kartuzy (HBC).

For specification of recycled rocket ballistic charges of gunpowder or the respective powder mixtures material the HBC without deformation must withstand temperatures of +100°C. For mixed formulations of this temperature should be +150°C. the exposure Time HBC during the descent of the device in the well to ignition and subsequent combustion TTZ should be not less than one hour. While HBC should be completely burned.

The task provided that the device for processing of the reservoir, coupled with a cable-rope, open frame contains a cylindrical propellant charge igniter and snap, while the solid propellant charge is closed rigid combustible cap, minimizing deformation of the charge at elevated temperatures in the borehole and the allocation of additional amounts of energy, while the composition of the hard burning of the cap includes the following components, wt.%:

thermosetting polymer composition - 30...37;

pyroxylin fiber - 18...22;

explosive - 42...48 and

over 100%:

ethyl alcohol - 10;

the wetting agent is 0.1.

Thermosetting polymer composition may be represented, for example, in the form of elastic viscous acrylate binder - oligomer D-TM, oligoadenylate TGM-3, methyl methacrylate, benzoyl peroxide. Named components can be used either in the amount or exception, for example, one of them in different quantity combinations. As explosives can be used, for example, the R, RDX or HMX, or tetryl. As the wetting agent can be used Penta 69 or formalistically, or glycerol. As an option as a Supplement to the claimed compositions can be used, for example, porofor in the number of 0-3 wt.%. All these substances are individually known and described in the technical literature (see, for example, Khmelnitsky LI Handbook of explosives, Moscow, Chemistry, 1962; Braginsky, VA and others, plastics Processing, reference manual, Leningrad, Khimiya, 1985).

The method of manufacture. HBC, consisting of a high modulus polymer composition is produced by special technology. Powder weight pyroxylin fiber or a mixture of cellulose fibers is introduced into the aqueous polymer composition of thermosetting binder. As explosives add fine RDX or HMX and mix the mass. From the resulting premix is formed into billets, dried, subjected to hot-pressing. The tensile strength of HCC after cooling and raspredeleniya is not less than 16 MPa. The modulus of elasticity is much larger in relation to the specification and up to 500 MPa. The burning rate HBC is in accordance with the performance specification.

HBC has the shape of a cylindrical Cup with a wall thickness from one to several millimeters. He placed a charge in the region have the minimum clearance from HBC. On the bottom axis of the glass predusmorenno hole. Elements HBC may partially or completely overlap the inner surface of the Central channel of the charge or part of it. Rope snap device is outside of the TTZ in its longitudinal grooves inside HBC. Rope or anchor pipe axis specification are also within HBC placed in the channel charge.

In figure 1 the example shows the structure of the downhole device having a planar channel cylindrical battery 1 and the igniter 2. The charge is closed from high temperature cap 3 and is connected to the cable by the cable 4. The rope 5 passes outside of the charge along its longitudinal grooves. The cap remains on the outside, not letting the rope out of the grooves during the descent into the well.

The device operates as follows. Before descending into the well it is collected from the individual TTZ placed in HBC. The assembled device with TTZ lower in the selected interval of the formation in the zone of high temperatures.

With increasing temperature specification by reducing the elastic modulus and the subsequent developing deformation under its own weight choose a constructive gap between specification and HBC. These provide hard contact between them. Strength HBC ensure the stability of the shape of the combined charge. This reduces deformation of the TTZ and ensures normal is xploitation characteristics of the device.

The presence of the powder mass of explosive substance in the composition of the HBC provides additional thermal energy. Layer more warming up, increase the tributaries of the downhole fluids. Processing efficiency is increased.

The combined charge (HBC) is offered in any of geological and technical conditions of the wells, including at elevated temperatures.

Sources of information

1. RF patent №2106485. IPC E21B 43/263. The method of processing bottom-hole formation zone and device for its implementation. Red-cheeked SCI, samoshkin VI, Sanshou L.G. and other Appl. 25.08.1995, Publ. 10.03.1998.

2. RF patent №2183740. C1, 6 E21B 43/263. The caseless charge sectional for gas-dynamic stimulation. The Paderin MG, Gazizov F.M. and other Appl. 22.08.2001. Publ. 20.06.2002.

3. RF patent №2175059. MCI E21B 43/263. The gas generator solid fuel with adjustable pulse for stimulation. Krushenko E, Gribanov NI, Gaivoronsky I.N. and other Appl. 06.10.1999. Publ. 20.10.2001.

4. RF patent №100554 for a utility model. Prior. 16.07.2009. Publ. 20.12.10. Bull. No. 35. A device for processing a productive formation. Pelykh NM, Bogdanov HE is the prototype.

A device for processing a productive formation of a solid propellant charge, coupled with the cable-a cable containing planar cylindrical propellant charge igniter and snap, characterized in that the solid is toplivnyy charge closed rigid combustible cap, minimizing deformation of the charge at elevated temperatures in the borehole and the allocation of additional amounts of energy, while the composition of the hard burning of the cap includes the following components, wt%:
thermosetting polymer composition - 30...37;
pyroxylin fiber - 18...22;
explosive - 42...48 and
over 100%:
ethyl alcohol - 10;
the wetting agent is 0.1.



 

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4 cl, 2 tbl, 2 dwg

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