The method of temporary isolation layer, the material and the shell for its implementation

 

The invention relates to the field of oil and gas industry and can be used for the repair and insulation works well. Technical result - increase the efficiency of the method by simplifying the delivery of obstructive material on the bottom, increasing the adhesion strength of the material, simplifying the design of jelonki. In the way of temporary isolation layer, comprising preparing a combustible bridging of insulation material containing the oxidant, fuel - Thiokol and its curing agent, delivery of the specified material in the interval isolation layer well, solidification with the formation of the tube and remove it by burning, combustible seal material is prepared by parts in stationary conditions: neocoregames part of oxidizer, fuel - Thiokol and advanced epoxy resin ED-20 and a separate mixture of hardeners for Thiokol made part of the field is mixed with the introduction of hardener specified epoxy resin and the resulting material fills the shell, which is lowered into the well on a cable-rope, thus ousting him from jelonki in the interval insulation layer is carried out under pressure, of gases formed after burning ZAR the material for temporary isolation layer for the implementation of the above method, including ammonium perchlorate, Thiokol, diphenylguanidine, pasta 9 and dibutyl phthalate, further comprises epoxy resin ED-20 and hardener resin AF-2 in the following ratio of ingredients, wt. %: ammonium perchlorate - 25-35; Thiokol - 30-35; dibutyl - 8,0-12; pasta 9 - 3,0-4,0; diphenylguanidine - 0,3-0,4; epoxy resin ED-20 - 15-18; hardener AF-9 - 3,0-3,6. In combustible seal material as neocoregames part of a mixture of ammonium perchlorate, Thiokol, dibutyl phthalate and epoxy resin ED-20, and as hardeners for fuel - Thiokol - mix paste 9 diphenylguanidine. In the shell for the implementation of the above method, comprising a housing with Windows in the upper part of the cover at the cutting elements, the grid-divider that divides the cavity jelonki on two cameras - top for placing a charge with the electric igniter and bottom to accommodate seal material, head to enter the cable and the plug, the plug is made in the form of elastic combustible membrane segment shape, a spherical surface facing the housing cover of the same material as combustible seal material serving as the bottom part of the housing, with the spherical surface of the membrane A thread membrane to the lower end of the tube, formed after the ousting of the specified material from jelonki, and after repairs ignition and combustion of the membrane from the products of combustion tube when it is removed by burning. 3 S. and 1 C.p. f-crystals, 1 Il.

The invention relates to the field of oil and gas industry and can be used for the repair and insulation works well.

There is a method of temporary isolation layer in the borehole (see ed. St. USSR 579408, CL E 21 In 33/13, publ. in B. I. 41 from 05.11.77, by injection downhole seal material based on a mixture of oxidizer with fuel and setting it in the perforated interval with the formation of the tube.

After repairs are complete, the tube is removed by burning. At the same time as the seal material, a mixture of oxidizer is ammonium perchlorate and fuel - epoxy resin ED-20 hardener.

The disadvantage of this method is the necessity of pumping the insulation material on the tubing (tubing) or annular space to the bottom, which is difficult, time consuming and dangerous operation, because of its high sensitivity to friction possible premature poplasen in B. I. 2 from 15.01.81 g) providing for the preparation of obstructive material containing ammonium perchlorate, Thiokol, diphenylguanidine, pasta 9 and dibutylphtalate with its injection into the well through the tubing in the interval of the insulated layer, curing it with the formation of the tube, and the destruction of its burning after repairs are complete.

The specified method to the technical nature closer to offer and can serve as a prototype.

The prototype has the same drawbacks as the similar. In addition, it can be noted that the seal material does not have sufficient adhesive strength to the surface of the production string, in consequence, does not stand up to the desired pressure difference value of 15 MPa between borehole and formation pressure.

The present invention is to increase the efficiency of the method by simplifying technology delivery obstructive material on the bottom, as well as increase its adhesive strength.

It is known device (see ed. St. USSR 88355, CL E 21 In 43/24, publ. in B. I. 43 from 1981), containing a tubular body made in the form of two concentric set of nozzles, head cable, PRSA tube in the borehole due to its structural characteristics is not possible.

The closest analogues of the proposed shell can be, published in B. I. 43 for 1982, the invention auth. St. 976025 called "Shell for cementing wells, comprising a housing with Windows in the upper part of the cover at the cutting elements, the grid-divider that divides the cavity jelonki into two chambers, the upper for the placement of the charge electric igniter and bottom to accommodate the seal material, the head input cable and plug.

A disadvantage of the known jelonki design is the complexity of jelonki.

The present invention is to simplify the design.

In the way of temporary isolation layer, comprising preparing a combustible bridging of insulation material containing the oxidant, fuel - Thiokol and its curing agent, delivery of the specified material in the interval isolation layer well, solidification with the formation of the tube and remove it by burning, combustible seal material is prepared by parts in stationary conditions - neocoregames part of oxidizer, fuel - Thiokol and advanced epoxy resin ED-20 and a separate mixture of hardeners for Thiokol made part of the field mixed with introduction otvetit the El-wire, thus ousting him from jelonki in the interval insulation layer is carried out under pressure, of gases formed after combustion of the charge electric igniter placed over the seal material in the shell. Combustible bridging material for temporary isolation layer for implementing the said method comprising ammonium perchlorate, Thiokol, diphenylguanidine, pasta 9 and dibutyl phthalate, further comprises epoxy resin ED-20 and hardener resin AF-2 in the following ratio of ingredients, wt. %: ammonium perchlorate - 25-35, Thiokol - 30-35, dibutyl - 8,0-12, pasta 9 - 3,0-4,0, diphenylguanidine - 0,3-0,4, epoxy resin ED-20 - 15-18, hardener AF-9 - 3,0-3,6. In combustible seal material as neocoregames part of a mixture of ammonium perchlorate, Thiokol, dibutyl phthalate and epoxy resin ED-20, and as hardeners for fuel - Thiokol - mix paste 9 diphenylguanidine. In the shell for the implementation of the above method, comprising a housing with Windows in the upper part of the cover at the cutting elements, the grid-divider that divides the cavity jelonki on two cameras - top for placing a charge with the electric igniter and bottom to accommodate the seal material of the first form, spherical surface facing the housing cover of the same material as combustible seal material serving as the bottom part of the housing, with the spherical surface of the membrane is associated with combustible seal material jelonki durable polymer thread to lock this thread membrane to the lower end of the tube, formed after the ousting of the specified material from jelonki, and after repairs ignition and combustion of the membrane from the products of combustion tube when it is removed by burning.

The drawing shows a shell filled with combustible seal material and placed in the upper chamber charge igniter.

The shell for implementing the method comprises a hollow cylindrical housing 1 with Windows 2 and 3 in the upper part, the cover 4 fixed to the housing at the cutting elements 5, the head 6 to enter the cable 7, the grating-lens 8 that divides the body cavity into two chambers, the upper 9 for placing a charge of 10 with the electric igniter and the bottom 11, to fill combustible seal material 12 and the cover 13 made in the form of an elastic membrane segment shape, a spherical surface Abramson material. Box 3 are designed for escape of gases when exceeding the maximum permissible pressure in the upper chamber jelonki.

The method is as follows. In the process described and the composition of the combustible material. First in a hospital (on the basis of industrial maintenance) prepare estimated separately mixture poterjannogo oxidant with fuel containing the following ratio of ingredients, wt.%: Ammonium perchlorate - 25 - 35 Thiokol - 30 - 35 Dibutyl - 8,0 - 12 Epoxy resin ED-20 - 15 - 18 by stirring.

Prepare separately a mixture of hardeners for fuel, for Thiokol separately mixture paste 9 diphenylguanidine 3,0-4,0 and 0.3 to 0.4 wt.% respectively and separately hardener AF-2 in the range of 3.0 to 3.6 in wt.% for epoxy resin. Hardener AF-2 prepared according to THE 38.30368-88. Used to prepare material paste 9 is a mechanical mixture of peroxide of manganese, dibutyl phthalate and stearic acid. Normative document regulating its composition - GOST 25593-83.

AF-2 - beyond 10587-84, the hardener of epoxy resin which is a mixture of mono, di, three substituted aminoalkylindoles. Epoxy resin ED-20 GOST 10587-84 with GOST 12812-80 liquid polysulfide polymer stamps UXO-2. Dibutyl GOST 2102-67. Diphenylguanidine (melanin) on THE 40-80 - accelerator curing tokalov.

It is known that epoxy resin having in the cured state is quite high physico-mechanical properties, shows the weakening of the adhesion to the powder ammonium perchlorate in the curing process in the borehole fluid. On the other hand, bridging material based on ammonium perchlorate and Thiokol has a high resistance relative to the borehole fluid, but the lack of strength in downhole conditions. The introduction of epoxy resin with hardener AF-2 in the mixture based on ammonium perchlorate and Thiokol allows you to receive combustible seal material with high resistance to the downhole fluid at the level of material in the prototype method, and improved physical and mechanical properties in downhole conditions. The proposed combustible seal material, in particular, enables almost two-fold increase in the wells of the ultimate tensile strength (0.5 to 5.5 MPa), compared with material in the method prototype (2,8... 3.0 MPa).

Due to the fact that epoxy resin has a high viscosity compared to tikolo, reduced viscosity sukupolvi this viscosity seal material amounted to (3... 810³SP) which is lower than that of the material for the prototype method (4...910⁴JV).

Minimum and maximum limits of the content of ammonium perchlorate selected taking into account the fact that in this range seal material burns with formation of gaseous products. When the content of ammonium perchlorate more than 35% of the mixture has a high viscosity, and when the content is less than 25% is incomplete decomposition of the combustible components with the formation of undesirable solid carbon particles. The limits of the content of other components taken with regard to the need to achieve optimal physical, mechanical and technological characteristics of the seal material. The proposed bridging material to the stage of curing is viable at 20^oWith within 7...9 o'clock is Not sensitive to impact and friction by a standard method. The volume of gaseous products of combustion is 700...750 l/kg Then in the field, i.e. at the wellhead prepared mixture is mixed until a homogeneous mass and fill them with the shell, i.e. the lower chamber 11, to the height of the lower divider 8 by an amount equal to one diameter jelonki. Then the cover 4 is closed and Zack electric igniter and screwed cable head 6, previously filling out the free cavity above combustible seal material, for example, with an inert liquid or water as indicated on the drawing.

Next to the head 6 input connect the cable 7 and with it the shell is delivered to a predetermined depth. Then through the cable serves an electrical impulse to the electric igniter, which is a combustion charge 10. The resultant gases exert pressure simultaneously on the inert liquid seal material 12 and an associated polymeric filament 14 of the membrane 13. In the bridging material, getting rid of jelonki in the well, forming a tube, which when cured, can withstand large pressure differentials. Next, the shell is raised on the surface. After planned renovations in the hole down the electric igniter and set fire to the plug. The igniter uses a checker based on zhelezoiridievykh termite. The products of combustion tube in turn ignite the membrane, after the combustion of which is the liberation of the wellbore. The combustion tube is a simultaneous treatment of the formation with heat and pressure of the gas. Bench tests mitrousis downhole conditions of a liquid medium and pressure, showed that this is a reliable actuation of jelonki, the displacement of the material together with the membrane and the formation of the tube, after curing which is achieved adhesive strength of the material to the wall of the barrel when the pressure drops to 15 MPa for 48 hours found that the cured tube and the membrane is completely burnt by the igniter-checkers.

Technical and economic advantage of the invention is as follows.

The invention provides for increasing the effectiveness of work to establish the bottom hole of the temporary plug from the combustible seal material with sufficient strength and adhesion properties. The use of the invention improves the performance of temporary isolation layer.

Claims

1. The method of temporary isolation layer, comprising preparing a combustible bridging of insulation material containing the oxidant, fuel - Thiokol and its curing agent, delivery of the specified material in the interval isolation layer well, solidification with the formation of the tube and remove it by burning, characterized in that the combustible seal material is prepared by parts in stationary conditions the offer hardeners for Thiokol, prepared parts in the field is mixed with the introduction of hardener specified epoxy resin and the resulting material fills the shell, which is lowered into the well on a cable-rope, with the ousting him from jelonki in the interval insulation layer is carried out under pressure, of gases formed after combustion of the charge electric igniter placed over the seal material in the shell.

2. Combustible bridging material for temporary isolation layer comprising ammonium perchlorate, Thiokol, diphenylguanidine, pasta 9 and dibutyl phthalate, characterized in that for the implementation of the method according to p. 1 he further comprises epoxy resin ED-20 and hardener resin AF-2 in the following ratio of ingredients, wt.%: Ammonium perchlorate - 25 - 35 Thiokol - 30 - 35 Dibutyl - 8,0 - 12
Pasta 9 - 3,0 - 4,0
Diphenylguanidine - 0,3 - 0,4
Epoxy resin ED-20 - 15 - 18
Hardener AF-9 - 3,0 - 3,6
3. The material on p. 2, characterized in that it comprises a mixture of ammonium perchlorate, Thiokol, dibutyl phthalate and epoxy resin ED-20 as neocoregames part of the seal material and the mixture paste 9 diphenylguanidine as hardeners for fuel-Thiokol.

4. The shell, comprising a housing with armery - top for placing a charge with the electric igniter and bottom to accommodate seal material, head to enter the cable and the plug, characterized in that for the implementation of the method according to p. 1 cap made in the form of elastic combustible membrane segment shape, a spherical surface facing the cover, made of the same material as the combustible bridging material, and serving as a bottom part of the housing, with the spherical surface of the membrane is associated with combustible seal material jelonki durable polymer thread to lock this thread membrane to the lower end of the tube, formed after the ousting of the specified material from jelonki, and after repairs ignition and combustion of the membrane from the products of combustion tube when it is removed by burning.