RU100554U1 - PRODUCTIVITY PROCESSING DEVICE - Google Patents

Abstract

 A device for treating a productive formation containing a solid charge of solid propellant material connected to a cable cable, made in the form of a continuous cylindrical block with an igniter and a central round channel with segments of solid fuel material protruding from the block located on opposite cylindrical surfaces of the block parallel to the axis of its central channel, with longitudinal grooves made in them, and the distance between the grooves is equal to the outer diameter of the cylindrical part of the checker, the ratio of the circumference to the base checkers each of the protruding segments of (6-9): 1, characterized in that the through channel is made and the ratio of its length to diameter ratio is (22-38): 1.

Description

The invention relates to the field of oil and gas industry and can be used to intensify the influx of oil and gas from reservoirs and increase their production. It also relates to the field of the coal industry, namely, for the degassing of pre-flooded coal seams (for the release of methane).

Known devices based on solid fuel elements (TFE) for processing wells, called generators. On a cable cable (wireline cable) they are lowered into the well and installed in the processing interval of the reservoir or near it.

During the combustion of thermoelectric fuel, a thermogasochemical effect on the formation occurs, followed by an increase in hydrocarbon production.

In devices - analogs [1 ... 5] there are only channel TFEs (checkers). Their common drawbacks are the imperfection of the ignition units using bulky equipment passing through the channels of the checkers. The metal parts of the tooling may remain in the well after processing. In addition, at elevated temperatures and pressures, such equipment makes it difficult for the combustion products to exit the channel. Because of this, the probability of rupturing checkers increases.

During thermogas-chemical treatment of thermoelectric fuel cells, perforation channels expand in the reservoirs, cracks form, various deposits melt, the formation is cleaned of chemical reaction products, sand and clay particles, and other processes occur.

The effectiveness of such well treatments can be increased due to the vibrational mode of combustion of the thermoelectric fuel. It causes elastic pressure waves generated from the channel of the element, and carries out additional vibratory effects on the productive formations. It affects rocks and fluids. Ultimately, microcracks and channels are formed, the filtration characteristics of the reservoir fluid are improved, etc. Vibrations help to reduce the pressure that destroys rocks.

An analog generator with a vibrating effect on the formation is described in [6].

It consists of a solid charge of solid propellant material in the form of a continuous cylindrical checker with an igniter and a central circular channel. The charge is connected with a cable to the cable - cable for launching into the well. The checker has transverse through channels for the exit of gaseous products and waves created by vibrational combustion from the central channel. Thanks to these channels, the risk of element breaks at elevated temperatures is reduced due to excess pressure in the channel over pressure from the outside.

On the opposite outer cylindrical surfaces of the comprehensively burning TFE there are longitudinal grooves for the equipment rope. The presence of such grooves leads to the appearance of two residual fragments of fuel at the end of the combustion of the fuel cell, which reduce the pressure in the well and reduce the efficiency of its processing.

To eliminate the fragments, the grooves had to be moved away from the TFE axis so that the distance between them and its outer diameter (along the cylindrical part) coincided. Therefore, the generator has been improved.

For the prototype of the device, the generator [7] was selected, which consists of an open-type charge in the form of a continuous cylindrical checker with an igniter and a central channel, as well as an assembly device. There are no snap-ins in the channel. The ratio of the length of the channel to its diameter is (40-120): 1. As in the generator [6], there are similar transverse through channels. The distance along the length of the checker between it is (20-40): 1 the length of the central circular channel and its diameter. On opposite cylindrical surfaces of the checker, parallel to the axis of its central channel, there are protruding segments for a snap rope. In the segments there are longitudinal grooves for the equipment rope connected to the cable - cable. The distance between the grooves is equal to the outer diameter of the checker, and the ratio of the length of its circumference to the base of each of the protruding segments is (6-9): 1.

The device under consideration, which is an acoustic powder pressure generator (PGDA), has been successfully used to treat production and injection wells. The length of the checker is 1200 mm, the diameter (along the cylindrical part) is 106 mm.

However, during the operation of the PGDA during descents to the perforation zone where it was burned, the following facts became clear.

1 At elevated temperature (more than + 80 ° С) and pressures (above 250 MPa) in the perforation zone, in deviated and contaminated wells, slowing down the flow of PHDA, the time spent by the checker in the well increases. She begin to lose their form. The longitudinal axis of the checker is curved. The curved parts of the block begin to rub against the production pipe and the block may become stuck in the well.

The ignition line can also be broken, as a result of which there will be failures when applying current to the heating elements. It is established that the change in the shape of the checkers is due to the large ratio of the length of the channel to its diameter and the insufficient thickness of the fuel arch.

2 It is established that at high temperatures and pressures the curvature of the checker is associated with a violation of its strength characteristics. The fuel from which it is made becomes softer. The pressure in the channel of the checker above the pressure outside while burning can reach 1-4 megapascals. A checker can burst from the inside at the very beginning of combustion, when the channel is narrow, and the ratio of its length to diameter is maximum.

The objective of the claimed utility model is such a refinement of the existing prototype generator, which will increase the reliability of its operation at elevated temperatures and pressures by longer preserving the shape of the checker under these conditions, as well as by reducing the risk of its rupture from excessive pressure and pressure waves during vibration combustion arising in the channel checkers.

The problem is solved as follows. The device for processing a reservoir contains a solid charge of solid propellant material connected to a cable cable, made in the form of a continuous cylindrical block with an igniter and a central circular channel with segments of solid fuel material protruding from the block. Segments are located on opposite cylindrical surfaces of the checker parallel to the axis of its central channel, with longitudinal grooves made in them. The distance between the grooves is equal to the outer diameter of the cylindrical part of the checker, and the ratio of the circumference of the checker to the base of each of the protruding segments is (6-9): 1.

New is that the channel is made through, and the ratio of its length to diameter is (22-38): 1.

The generator depicted in figure 1, has a charge 1 of solid fuel material that does not have a housing connected to the cable cable 2.

The charge is made in the form of a continuous cylindrical checker with an igniter 3 and a central through circular channel. Segments 4 are located on opposite surfaces of the checker parallel to the axis of its central channel. They have longitudinal grooves for the rope. The distance between them is equal to the outer diameter of the cylindrical part of the checker.

The ratio of the circumference of the checker to the base of each of the protruding segments is (6-9): 1, and the ratio of the length of the channel to its diameter is (22-38): 1. The latter ratio is less compared to the prototype for which it is (40-120): 1.

Reducing the ratio of the length of the channel to its diameter (shortening the checkers) with an enlarged arch reduces the likelihood of its distortion during prolonged exposure to elevated temperature before the start of the well treatment, as well as the risk of breaks from the inside when burning.

With a reduced ratio of the length of the channel to its diameter (compared with the prototype), there will also be a vibrational regime of combustion of the thermoelectric fuel, which leads to the appearance of pressure waves with the subsequent microwave exposure to the formation. The transverse through holes in the checker (as in PGDA) are not needed, because it is shorter.

The minimum strength of the checkers will be observed when the ratio of the channel length to its diameter is 38: 1.

With ratios of more than 38: 1, the combustion products do not have time to leave the channel of the checker, bursting it from the inside and leading to ruptures.

With ratios less than 22: 1, the strength of the checker is maximum. However, with a further decrease in the ratio of the pressure waves in the channel, the accompanying vibrational combustion will not occur due to large losses at the ends of the checkers. There will be no microwave exposure to formations. The effectiveness of the generator on the reservoir will decrease due to this.

The generator operates as follows. Using equipment, it is collected at the wellhead from several checkers having gaps between them for the exit of combustion products from the channels and the generation of pressure waves arising in the channels. Then the generator is lowered into the selected interval of the processing layer. After it is stopped, the fuel cells are ignited by thermogasochemical and vibration microwave effects on the formation.

As a result, perforation channels expand, new main channels, cracks and other processes occur in rocks, as well as changes in fluids that are favorable for increasing oil and gas recovery of reservoirs and increasing production of tributaries.

The proposed device can be successfully used in any production and injection wells. With increased temperature and pressure, it will be more reliable than the prototype, dangerous for work in such conditions.

Information sources:

1. USSR Copyright Certificate No. 1704513 A1, 5 cells. E21v 43/263. A device for impacting a formation by pressure of solid fuel combustion products. Sukhorukov G.I., Belyaev B.M. et al. 05/03/1988. Zaregistr. 09/08/1991.

2. RF patent No. 2018508. C1, IPC 5 C 5/00. Solid fuel well gas generator. Kroshchenko V.D., Kolyasov S.M., et al. 01/02/90. Publ. 08/30/94. Bull. No. 16.

3. RF patent No. 20047744. C1, IPC 6 E21B 43/11, 43/26. Device for stimulating the formation. Gaivoronsky I.N., Kroshchenko V.D., et al. 03/23/92. Publ. 11/10/95. Bull. No. 31.

4. RF patent No. 2183740. C1, IPC 6 E21B 43/263. Sectional uncharged charge for gas-dynamic impact on the formation. Paderin M.G., Gazizov F.M. et al. 08/22/2001. Publ. 06/20/2002.

5. RF patent No. 2175059. C2, IPC E21B 43/263. Solid fuel gas generator with adjustable pulse for stimulation of wells. Kroshchenko V.D., Gribanov N.I., Gaivoronsky I.N. et al. 10/06/1999. Publ. 10/20/2001.

6. RF patent No. 2071556. C1. IPC. 7 E21B 43/45. Device for thermogasochemical treatment of the reservoir. Mikhnevich V.G., Pelykh N.M., Yuzhaninov P.M. et al. 05/10/1994. Publ. 01/10/1997. Bull. No. 1.

7. RF patent No. 2151282 C1. IPC. 7 E21B 43/45. Device for thermogasochemical treatment of the reservoir. Pelykh N.M., Kuzmitsky G.E., Soloviev N.N. et al. 02/08/1999. Publ. 06/20. 2000. Bull. No. 1 is a prototype.

Claims (1)

A device for treating a productive formation containing a solid charge of solid propellant material connected to a cable cable, made in the form of a continuous cylindrical block with an igniter and a central round channel with segments of solid fuel material protruding from the block located on opposite cylindrical surfaces of the block parallel to the axis of its central channel, with longitudinal grooves made in them, and the distance between the grooves is equal to the outer diameter of the cylindrical part of the checker, the ratio of the circumference to the base checkers each of the protruding segments of (6-9): 1, characterized in that the through channel is made and the ratio of its length to diameter ratio is (22-38): 1.