Processing method of bottom-hole formation zone with charge at increased temperatures

FIELD: oil and gas industry.

SUBSTANCE: method involves creation of excess pressure in a well by action on a formation with gaseous combustion products of propellant charge. According to the method, at prolonged high-temperature action on propellant charge at its lowering into the well, propellant charge is used together with a stiff combustible cap that contains the following components, wt %: thermoreactive polymer composition - 30…37; pyroxiline fibre - 18…22; explosive component - 42…48 and over 100%: ethyl alcohol - 10; wetting agent - 0.1.

EFFECT: increasing safety of a processing method of bottom-hole formation zone and its efficiency owing to reducing deformation of propellant charge.

1 ex, 1 dwg


The invention relates to Neftegazodobycha industry and applicable to higher inflows of oil and gas from wells and increase neftegazodobychi existing wells to increase the performance of new wells after the badly made perforations for resuscitation dirty old wells.

The method can also be used for degassing metropoline arrays and industrial methane production from them, for the extraction of solid minerals leaching, as well as to increase the productivity of water wells.

Method implemented using solid fuel charges (TTZ) of energetic condensed systems - ballistic missile and artillery gunpowder or placewhich solid fuels. Using the device for Assembly the charges connected to a cable and lowered into the borehole in the processing interval of the productive formation or near it.

After ignition TTZ current cable and combustion occurs termoliticheskogo impact on the reservoir. This leads to the appearance of longitudinal and transverse cracks, expansion of existing channels and other changes in species contributing to increase hydrocarbon production.

To increase inflows necessary to increase the pressure in the borehole and its duration during combustion of the charge. But excessively excessively high the pressure may break the casing and the adhesion of the cement stone. Therefore, at sufficiently high pressure, safe to wells, the charges must not be destroyed in the combustion process with the appearance of abnormally high usmievam pressure.

When the temperature in the borehole to +80...+150°C (respectively increasing and pressure) modulus of elasticity TTZ significantly reduced compared with normal temperature. The charges become soft, happen their deformation, change sizes, appear curvature. At the same time in the cavities of their channels, if they are quite long and narrow, after the start of combustion of the charge pressure begins to exceed the above external (outside channel) pressure. The excess can reach several megapascals. As a result, the battery may rupture with subsequent abnormal pressure in the well. In addition, changing the size and curvature of the TTZ can break the line of ignition going to the charges, which will lead to failure.

Known analog - processing method of the productive formation and device for its implementation specification [1]. The disadvantage of this method consists in using charges with accessories (tubes) in their channels. Such charges are subject to deformation at elevated temperatures.

Known methods of formation treatment using channel solid-propellant charges, without any elements of the snap-in channel [2, 3]. At elevated temperatures implement them who isace, as in the method [1], is difficult due to possible deformations of the TTZ, leading to opisyvaemymi above negative consequences.

The closest technical solution chosen as a prototype for the proposed method is a complex method of well stimulation [4]. According to this method, planar cylindrical solid toplivnyy charge has no elements snap-in channel and coatings on the outside. However, to prevent cumulative excess pressure in the channels of the charges they feature a radial discharge openings for exit of gaseous combustion products from them. The method allows for termoliticheskogo pressure and vibration wave impact on the reservoir. Rope device Assembly for connection with the cable is on the opposite side of the charge parallel to its longitudinal axis.

The method showed high efficiency. But long-term high temperature exposure in the well, there is the danger of deformation of the charge. So it can be destroyed after the start of combustion. Moreover, in all the above methods, equipment remain in the well and do not emit the extra energy.

The technical result of the invention is to improve the security method of processing bottom-hole formation zone and its effectiveness by reducing the Def is rmacie solid fuel charge and the additional quantity of heat when burning.

The claimed technical result is achieved by a method of processing bottom-hole formation zone includes the creation of excess pressure in the well by affecting the formation of gaseous products of combustion of the solid propellant charge. According to the invention during prolonged high-temperature exposure on solid propellant charge when lowering it into the well a solid propellant charge is used with a rigid combustible cap, which consists of 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 a viscoelastic 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, 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 of the substances from which eljnosti known and described in the technical literature (see, for example, Khmelnitsky LI Handbook of explosives, Moscow, Chemistry, 1962; Braginsky Century A. and others, plastics Processing, reference manual, Leningrad, Khimiya, 1985).

HBC for the proposed method has the form of a cylindrical Cup with a wall thickness from one to several millimeters. It consists of the above-mentioned high-modulus polymer composition. It consists of the powder mass and explosive - fine RDX or HMX and other components. The tensile strength of the frame is not less than 16 MPa and the elastic modulus of 500 MPa. These values are much higher with respect to the specification.

The charge is placed in HCC with a gap or without him. At the bottom of the HBC as part of this combined TTZ there is a hole. Part of the HBC can be in the channel specification.

The combined charge can have snap-in, for example, a support tube passing through the same channel or rope outside. Not all the charges in the Assembly should be closed puck. It can only be more deformable bottom TTZ, which press the upper.

Because of the presence of explosives and explosive components that emit energy, HBC is completely consumed in the well. Because of the way technology HBC and its components explosion is not happening. An example implementation of the method in the oil well. It used a combined charge, which is shown in Figo consists of a planar channel of the cylindrical battery 1 and the igniter 2. The charge is closed hard burning the 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 TTZ when lowering it into the well.

The combined charge of the ballistic powder is lowered into the well for 75 minutes at a depth of 3450 meters. As the temperature increases as you descend the charge becomes soft. However, the increased strength of the material HBC relative to the powder prevents changing the shape of the TTZ. Therefore, the combined charge of deformation does not occur. Combustion with increasing pressure in the well is without his abnormal bursts. Combustion of all of the cap provides an additional flow of energy in the reservoir.

The oil output after processing bottom-hole formation zone increases.

The proposed method is more robust with respect to the prototype.

It can be applied even when the secondary reservoir opening Parthenon combine in a single device shaped punch and combined charges.

The method is especially recommended for machining high-temperature wells.

Sources of information

1. RF patent 2106485. IPC EV 43/263. The method of processing bottom-hole formation zone and device for its implementation. Getting settled at SCI, samoshkin VI, Sanshou L.G. and other Appl. 25.08.1995. Publ. 10.03.1998.

3. RF patent 2176728. Prior. 27.12.2000. Publ. 10.12.2001. The processing method of the reservoir and charge. Pelykh NM, Baldin AV, Yuzhaninov M. and others

4. RF patent 2282027. Prior. 16.12.2004. Publ. 20.08.2006. Integrated method of well stimulation. Pelykh NM, Fedchenko N., Gaisin and Russia, having got other prototype.

The method of processing bottom-hole formation zone charge at elevated temperatures, including the creation of excess pressure in the well by affecting the formation of gaseous products of combustion of the solid fuel charge, wherein during prolonged high-temperature exposure on solid propellant charge when lowering it into the well solid propellant charge is used with a rigid combustible cap, which consists of 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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