CN2279442Y

CN2279442Y - Current-limiting contrallable peak voltage high-energy gas generator

Info

Publication number: CN2279442Y
Application number: CN 96243761
Authority: CN
Inventors: 于镜华; 林香成
Original assignee: OIL RECOVERY TECHNOLOGY INST OF DAQING PETROLEUM ADMINISTRATION BUREAU
Current assignee: OIL RECOVERY TECHNOLOGY INST OF DAQING PETROLEUM ADMINISTRATION BUREAU
Priority date: 1996-10-22
Filing date: 1996-10-22
Publication date: 1998-04-22
Anticipated expiration: 2006-10-22

Abstract

The utility model discloses a current-limiting high-energy gas generator with a controllable peak pressure, belonging to a down-hole tool for fracturing the high energy gas of an oil gas layer. The utility model solves the technical problems that the utilization rate of the high pressure gas in the existing the prior art is low, the acting time of the oil gas layer is short, the energy is small, and the damage degree of casing tubes and cement rings is great. The utility model is characterized in that the current-limiting high-energy gas generator is provided with a current limiting structure composed of a lifting end plug and a coupling loop and a controllable peak pressure structure composed of a core and a casing, the casing is formed by connecting an outer telescopic tube, a communication coupling loop, a suspension body thread, and the core is formed by connecting a suspension head, an inner telescopic tube, a cutting body and a positioning guide shoe thread. The current-limiting high-energy gas generator is used for the fracturing improvement of the oil gas layer.

Description

The controlled peak pressure high-energy gas generator of current limliting

The utility model relates to the downhole tool that a kind of oilfield floor height energy gas fracturing is used.

Patent Office of the People's Republic of China discloses " a kind of oil-gas formation fracturing process with high-energy gas " on patent gazette in 94 years, application number is 93103293.8, after this technology is mainly ignited in down-hole moment by gunpowder, produce a large amount of high temperature, gases at high pressure, form with shock wave acts on the oil-gas Layer, makes the near wellbore zone form the micro-crack network, stops up to remove, and the communication intrinsic fracture, improve the flow conductivity of near wellbore zone.Having introduced the gas generator that high enegry gas fracturing uses in this method has the following disadvantages:

1, the lifting plug endoporus of its topmost is big, no control pressurer system.This instrument most of high temperature, gases at high pressure can not be controlled at give fractured layer disconnected in, high temperature, gases at high pressure can be to vertical, Radial Flow, and gas flow is big longitudinally, act on that energy on the oil-gas Layer is little, the time short.

2, the gas outlet internal diameter of generator is identical, and powder column is same specification, can not produce the pressure of multistage pulses, influences fracturing effect.

The purpose of this utility model is to avoid the weak point in the above-mentioned prior art and provides a kind of current limliting controlled peak pressure high-energy gas generator.

The purpose of this utility model can reach by following measure:

The utlity model has current limliting and controlled peak pressure structure, flow restriction is by carrying out plug and box cupling is formed, promote plug top and link to each other with cable, lower central has the following pore of 3mm, and link to each other with screw threads of coupler, the box cupling external diameter greater than gas outlet less than the external diameter of locating guide shoe; Controlled peak pressure structure is divided overcoat and fuse, both link to each other by shear pin, when shear pin is cut off, fuse glides in overcoat, fuse is formed by hanging head, interior telescoping tube, spliced body, location guide shoe screwed connection, overcoat is formed by outer telescoping tube, connection box cupling, suspension body screwed connection, and box cupling links to each other with the projecting tube screw thread.

The utility model compared with prior art has the following advantages:

1, the utlity model has flow restriction, after powder column ignites, can force gases at high pressure to produce radial flow, facing to the perforation borehole on the sleeve pipe, and be controlled in the sleeve pipe of this instrument aligning, make gases at high pressure to the oil-gas Layer long action time, the utilization rate height is saved dose, reduce cost, fracturing effect is good, can also make the outer pressure of generator lower, reduces sleeve pipe, cement sheath are damaged.

2, the utlity model has controlled peak pressure structure, when the difference of inside and outside pressure of generator surpasses design load, shear pin can be cut off; slide under the hanging head and make the generator elongation on the suspension body; reduce internal pressure, help protective casing, cement sheath, and help safe construction.

The drawing of accompanying drawing is described as follows:

Fig. 1 is a charge constitution schematic diagram in the utility model;

Fig. 2 is the outer charge constitution schematic diagram of the utility model;

Fig. 3 is the igniter structure enlarged drawing among Fig. 2;

Fig. 4 is a multistage pulses powder charge schematic diagram.

The utility model is described in further detail below in conjunction with accompanying drawing:

The utility model divides current limliting, powder charge and controlled peak pressure three big parts from top to bottom.

Shown in Figure 1: current-limiting components is made up of lifting plug 1, box cupling 2, and the powder charge parts are made up of gas outlet 3, box cupling 4; Controlled peak pressure parts are made up of hanging head 5, outer telescoping tube 6, interior telescoping tube 7, connection box cupling 8, suspension body 9, spliced body 10, shear pin 11, location guide shoe 12, and three big parts screwed connections are one.

Promote plug 1 top and link to each other with cable, lower central has the following pore of 3mm, and links to each other with box cupling 2 screw threads.

Box cupling 2 external diameters are Φ 124mm sleeve pipe greater than gas outlet 3, less than the external diameter of locating guide shoe 12 for internal diameter, and the box cupling external diameter is 110mm, and location guide shoe 12 external diameters are 115mm, should determine shutoff box cupling 2 and the external diameter of locating guide shoe 12 according to the casing inner diameter size.

Have disappointing groove on gas outlet 3 tube walls in the powder charge parts, the total length of gas outlet 3 is determined according to core intersection, connect with box cupling 4, be interior powder charge generally speaking, powder column 14 is contained in the gas outlet 3, and hold out against with swivel nut 16, igniting bag 15 is sealed in the powder column 14, is connected to power line 13 on the igniting bag 15 and it is passed with cable from the pore that promotes plug 1 links to each other.

Box cupling in bottom in the powder charge parts 4 and the screwed connection of controlled peak pressure structure, controlled peak pressure structure is divided overcoat and fuse, both link to each other by shear pin 11, when shear pin 11 is cut off, fuse can glide along overcoat, and fuse is connected and is formed by hanging head 5, interior telescoping tube 7, spliced body 10, location guide shoe 12 screw threads, and overcoat is formed by outer telescoping tube 6, connection box cupling 8, suspension body 9 screwed connections, suspension body 9 has a step, and being communicated with box cupling 8 has bleeder port.

During on-the-spot the use, instrument is connected, taking magnetic localizer with cable goes into the well with this generator, with well depth under the high-energy gas generator of the accurate school of magnetic localizer, make it aim at fractured interval, after the cable energising, light powder column, because the effect of flow restriction forces gases at high pressure to produce radial flow, and high energy gas is controlled in the sleeve pipe of generator aligning, and to oil-gas Layer high pressure long action time, high energy gas utilization rate height, and it is save dose and reduce cost, and little to sleeve pipe, cement sheath damaged condition.Poor when generator internal pressure and generator external pressure when surpassing design load, cut off shear pin 11, and hanging head is slipped to for 5 times on the step of suspension body 9, makes the instrument elongation, reduces internal pressure, helps safety in production.

As shown in Figure 2, can adopt outer charge constitution for the big well of need dose.

Powder column is enclosed within outside the central tube 17, central tube 17 bottoms and the screwed connection of controlled peak pressure parts, central tube 17 indirect have igniter 18, after the energising igniting, can produce high temperature, gases at high pressure.

As shown in Figure 3, will light a fire bag 19 and propellant foam 20 of igniter 18 is contained in the can of sealing, and the gas that energising igniting back produces promotes piston 21, cuts off pin 22 back pistons and move down, and exposes fire jetting hole 23, lights powder column.

As shown in Figure 4, for the low stratum of permeability, it is poor to absorb gas energy, can be in the middle of two gas outlets 3 of Fig. 1 link a thin powder charge pipe 24 of the interior latus rectum thinner time-delay powder column 25 of diameter of in this pencil, packing into two box cuplings 4, the high energy gas that can produce pulse acts on the stratum, the fracturing effect that can obtain.

Claims

The controlled peak pressure high-energy gas generator of current limliting, comprise the lifting plug, gas outlet, it is characterized in that: it has current limliting and controlled peak pressure structure, flow restriction is formed with box cupling (2) by promoting plug (1), promoting plug (1) top links to each other with cable, lower central has the following pore of 3mm, and link to each other with box cupling (2) screw thread, controlled peak pressure structure is divided overcoat and fuse, both link to each other by shear pin (11), when shear pin (11) was cut off, fuse can glide along overcoat, and fuse is by hanging head (5), interior telescoping tube (7), guide shoe (12) screwed connection of spliced body (10) location forms, overcoat is by outer telescoping tube (6), be communicated with box cupling (8), suspension body (9) screwed connection forms, suspension body (9) has a step, and being communicated with box cupling (8) has bleeder port, and box cupling (4) links to each other with outer telescoping tube (6) screw thread.