Formation treatment method

FIELD: oil production, particularly to penetrate oil formations characterized by low filtration characteristics.

SUBSTANCE: method involves applying gaseous medium pressure action to formation within productive zone interval, wherein the gaseous medium is obtained from reaction between oxidizing agent and fuel, which are self-ignited once brought into contact. The oxidizing agent is halogen fluoride or derivatives thereof or nitronium perchlorate. The fuel is formation fluid. Contact between the oxidizing agent and the formation fluid is provided by supplying the oxidizing agent into the formation in impulse mode. The oxidizing agent supplying is carried out in shots performed by gun or gas-jet perforator provided with bullet and oxidizing agent or with conical casing and oxidizing agent.

EFFECT: possibility to combine well perforation operation with crack forming (formation breakdown) operation and, as a result, increased ability of formation treatment.

4 cl, 2 tbl, 2 dwg

 

The invention relates to the oil and gas industry.

The most effective way can be used at the opening of the oil-bearing formations with low filtration characteristics.

A method of processing layer, including the impact on the formation of the productive interval zone pressure gaseous reaction products fuel-oxidizer composition, ensuring the creation of a network of cracks in the layer (gap layer) [1]. The disadvantage of this method is the need to pre-create perforations in the casing pipe and the reservoir, which leads to an increase in the number of technological operations, ensuring the opening of the reservoir (perforating wells and creation in the formation of a network of cracks). In addition, this method is characterized by a significant loss of energy of the reaction products, so as to create a pressure is inside the well (due to the operation of the generator or torpedoes with a charge of detonating cords) and therefore a significant part of the pressure pulse is dissipated in the volume of the well until the pressure at the reservoir. The possibility of increasing the effectiveness of this method is limited to the strength characteristics of the well and the volume of the generator or torpedoes, as the implementation of the method is based on creating an explosive process in SLE the new well.

A method of processing layer, taken as a prototype, including the impact on the formation of the productive interval zone pressure gaseous reaction products samovosplameneniya pair consisting of fuel and oxidizer, when making contact between them [2].

The disadvantages of the prototype method, as similar are the duration of the technological cycle (due to the necessity of not less than two-dive into the borehole geophysical instruments) and the dissipation of energy of the reaction products inside the wells, and that the implementation of the method is possible only when selecting special samovosplameneniya fuel-oxidizer pair and concentration of the reactants.

Object of the invention is to provide a method for formation treatment which would increase the efficiency of technological process of drilling through improved filtration properties of the reservoir in the process of punching holes.

The technical result from the use of the invention is expressed in the simplification and reduction of the technological process of processing of the reservoir due to overlapping operations of opening (punching) wells and a network cracking (fracturing).

This is achieved in that in the processing method of the reservoir, including the impact on the formation of the productive interval zone pressure gotoblas what's the products of the reaction between fuel and oxidant samovosplameneniya pair, when there is contact between them, according to the invention, as the oxidant used hypergolic highly active chemical reagent, and as a fuel - reservoir, thus ensuring contact between them is carried out by pulse recording hyperhaline highly active chemical reagent into the reservoir when the ejection punch holds a propelling element and hyperhaline highly active chemical reagent.

When it is desirable to vary the degree of pressure of the gaseous products of reaction of the fuel-oxidizer pair on the reservoir or to use different types of perforators (cumulative or bullet), the ratio of the mass hyperhaline highly active chemical reagent and weight throwing element of the punch is determined by the condition:

where Gp- weight hyperhaline highly active chemical reagent, g;

Gm- the mass of throwing item perforator,

In the particular case, when required in a limited volume to accommodate the greatest number of oxidant, as hyperhaline highly reactive reagent use fluorides of Halogens or their derivatives.

In some cases, when you want to increase the impact on the reservoir pressure decomposition products water chemistry, as hyperhaline h is coacting chemical reagent is used nitronium perchlorate.

Rarely used and explain the terms:

Hypergolic ("hypergolic") - spontaneously flammable [3];

Auto - progressive autoscoring chemical reaction, resulting in slow-motion process achieves very large ("explosive") speeds (sometimes instead of the term "spontaneous combustion" use the term "explosion"). This characteristic of the ignition is the presence of defined conditions (limits), limiting the area in which slow the reaction proceeds to the end without ignition [4]. It is in this area (combustion mode) is implemented by the method [2]

Hypergolic highly active chemical reagent (water chemistry) - oxidizer with hyperhaline property (the ability to create snowspeeders couple) in relation not only organic but also inorganic, including metal powder, flammable [5 ]. To highly active chemicals (highly active reagents), which has hyperhaline property in relation to organic and inorganic fuel, include, in particular, fluorine oxidizers (FD) from the class of halogen fluorides and their derivatives. The reaction of the chemical ability of FO is so high that, for example, for ignition of titanium powder in the air took the pulse supply just one milligrams which is as reagent [5 ]. In the method [2] none of the reagents does not have hyperhaline property against another, as they can ignite and continue to burn only a certain currency pair and at a certain concentration.

The significance of the distinctive features due to the following reasons:

Use as oxidant hypergolic highly active chemical agents (water chemistry), and as a fuel - reservoir eliminates the need for selection of special hypergolic fuel-oxidizer steam as water chemistry have hyperhaline property with respect to the components of the layer. In turn, the components of the reservoir as a fuel provides a higher degree of influence on the formation of gaseous reaction products samovosplameneniya pair, so as firing it directly into the reservoir. Ensuring contact between the fuel and oxidant by a pulse (one-time, short-term) of the recording layer components when shooting punch containing a propelling element, and an oxidant, improves the efficiency of formation treatment as the process of interaction of the fuel-oxidizer pair occurs simultaneously with the breaking in the formation of the perforation hole propelling element, localized inside profile of the channel and is not dissipated (to IOM the NTA pressure on the reservoir) in the amount of wells. Due to the high reactivity occurs spontaneously flammable process response water chemistry not only with organic (oil) structures, but also with the solid components of the layer. Spontaneously flammable nature of the response is accompanied by chemical burning of the rock components, as well as a large gas evolution with the creation of the perforation channel high pressure (calculated value of the pressure in the perforation channel can be up to several thousand atmospheres).

Materiality private distinctive features is explained by the following reasons:

The limitation of the components by weight causes the improvement of the conditions of entry of water chemistry in the reservoir, and also allows implementation of the method using different types of drills (cumulative or bullet). This is achieved when the following conditions are true:

where Gp- weight hyperhaline highly active chemical reagent, g;

Gm- the mass of throwing item,

Use as components fluoride oxidizing agents (fluoride halides and their derivatives) allows you to place considerable weight components in a limited amount of capsules (container)is placed in the punch, as their density is 2.5-3.0 g/cm3.

Use as components perchlo the ATA nitronium may increase in some cases adiabatic effects (in particular, with a fraction of the fuel pressure created by the decomposition of nitronium perchlorate, may exceed the pressure created by the decomposition of fluorine oxidizers).

The invention and its advantages are illustrated by a detailed description of examples of its implementation and the accompanying graphic materials, on which:

figure 1 depicts schematically a model of cumulative punch, containing the oxidizer and propellant element in Assembly with standard cement-sand target when shooting punch in the conditions of atmospheric pressure.

figure 2 depicts schematically a layout shaped punch, containing the oxidizer and propellant element in Assembly with standard cement-sand target inside the pressure vessel, simulating conditions in the well.

How is the impact on the formation of the productive interval zone, the pressure of the gaseous products of the reaction between the oxidizer and fuel samovosplameneniya pairs, when there is contact between them, and as the oxidant used hypergolic highly active chemical reagent, and as a fuel - reservoir, thus ensuring contact between them is carried out by pulse recording layer (in the perforation seam) hyperhaline highly active chemical re the Ghent by shooting a hole punch, hosting the throwing element and hyperhaline highly active chemical reagent.

Example 1. The layer processing performed by shooting a model of cumulative punch hosting the oxidizing agent, and a propelling element on the stand at atmospheric pressure. As oxidant took anionic complex fluoride halogen, as fuel took a standard dry (nettinayto) layered target representing cement-sand (concrete) block enclosed within a metal shell. For carrying out the shooting model perforators (figure 1) oxidizer 1 was filled in a Teflon capsule 2 and have sealed it with a lid 3. The assembled capsule 2 was placed inside the metal sleeve 4, which was installed on a cement-sandy block 5, enclosed in a metal shell 6. Between the ferrule 4 and unit 5 placed the steel plate 7, imitating the casing. Then the ferrule 4 has set the standard cumulative charge PC N (POS. 8) with a copper cone facing (a propelling element) 9 and closed his glass cap 10 (similar with a regular hammer type SPX) [6]. Parts 1-4, 8-10 in the Assembly represent the cumulative punch. After Assembly of the model gun and placing it on the target was set detonating cord 11 and the detonator 12 and Westlake shooting drills. To assess the conditions of entry of water chemistry in the reservoir varied its mass within 50-65, When the ejection punch lining 9 in the form of "pest" punched hole (channel) in the plate 7 and in block 5, in which following this was pulsed mode oxidizer 1 and contacted with the surface layer on the end face of the block 5 and the inside of the perforation hole. In hyperhaline properties of water chemistry occurred samovosplameneniya chemical reaction between them and the components of the reservoir targets with the formation of gaseous products of combustion, which was created by the high pressure acting on the layer (stratiform target), which led to an increase in the number of cracks in the target in its upper part (the view of the perforation hole and cracks indicated respectively by the arrows a and B). The results are given in table 1. Compared to the control experiment without oxidant (experiment No. 1) the number of cracks increased in 2 times (experiment No. 2). By increasing the mass of oxidizer to 65 g were observed partial dispersion without increasing the number of cracks. Therefore, the ratio of the mass of the oxidizer to the mass of throwing item, breaking the layer, equal to 4.0 (experiment No. 4), can be taken as a limit.

Example 2. The layer processing performed by shooting a layout shaped punch hosting the oxidizing agent in the vessel, high pressure is I (scheme 2). As oxidant 1 took hypergolic highly active chemical reagent is a cationic complex fluoride halogen, as a fuel reservoir in the productive interval zone) took standard oil-saturated sand-cement (concrete) target.

The reservoir target is a concrete block 5, is placed inside a solid shell (liner) 6 thickness of 10 mm, made of glued cartridge paper. The saturation of the target organic fuel was carried out by immersing them in heated (to a temperature of 100° (C) condition in container with diesel fuel to 10 days, followed by exposure to the open air for 20 days.

The order of Assembly and ejection punch similar to example 1 with the following differences: the cap 10 is made of steel and hermetically was laboratively on a holder 4; sealing cover 3 is made of PTFE and (or) of metal; as a propelling element used tungsten-copper cone facing 9; placement model cumulative perforator (consisting of parts 1-4, 8-10) on a steel plate 7 was performed using the locking ring 13 (imitating the gap between the hammer and the casing pipe in the well).

Assembled model cumulative punch with produced target 5, 6 placed in the Cup 14, which has been established is at the bottom of the pressure vessel 15, filled with water. After that, the pressure vessel was closed shut by a cover (not shown in figure 2), in the vessel 15 has created a hydraulic pressure equal to 20 MPa, (simulating conditions in the borehole at a depth of 2000 m) and perform the ejection punch placed in it oxidant 1.

The results of the tests are given in table. 2, showed that the treatment of the formation using a model of cumulative punch containing components weighing 16-18 g, the area of opening of the reservoir target was increased 3.7-6.6 times compared to the control experiment without water chemistry (ratioranged from 0.76 0,83).

Example 3. Processing reservoir (reservoir targets) were carried out by shooting bench bullet punch with oxidizer placed inside a metal capsule is mounted in the hull front part of the bullet (projectile). The ratio of the mass of the oxidizer to the mass of throwing item amounted to 0.03. As oxidant components used in example 2, as fuel used plaster target hardened inside a metal box with dimensions 40×40×40 see At the top of the box was filled layer of diesel fuel to saturate the target. The contacting of the oxidizer with the fuel carried by the pulse entering the oxidizer in a layered target due to destroyed what I capsules with water chemistry during penetration of the target by a bullet. In the reaction of the oxidizer with the fuel target was destroyed with the dispersion pieces of the target up to 5 m given the significant destruction of the target, and taking into account the fact that the strength of the layer is in General higher than the strength of the used target ratio0,03 can be taken as a minimum.

Thus, the proposed method in terms of the described examples, it will also increase the efficiency of technological process of formation by combining the operation of the perforating wells and fracturing to enhance its filtration properties.

Sources of information

1. The processing method of the reservoir. RF patent №2155863, IPC7E 21 B 43/263, 2003.

2. Method of fracturing pressure of the gaseous products. RF patent №2178073 IPC7E 21 B 43/263, 2001.

3. "English-Russian-English physical dictionary", M: "English", 1978, page 316.

4. "Physical encyclopedic dictionary, ed. "Soviet encyclopedia", t 4, 1965, page 458.

5. V.D. Zhigarev. "Some Aspects of Intensification of SHS Technology of Production of Refractory Powder Compounds", International Journal of Self-Propagating High-Temperature Synthesis", Volume 8, Number 4, 1999, p.467.

6. "Handbook of perforating equipment", Ed. by Leafroller, M., Nedra, 1983.

Table 1

The results of the shooting model ku is Ustinova perforator (example 1)
no experienceMass, gThe nature of the perforation hole
Water chemistry (Gp)Cladding (Gm)
1 (control)without water chemistry16-The presence of a zone of fractures near the end to a depth of 20 mm
250163,1The developed area of the cracks near the end to a depth of 40 mm (the number of cracks increased in comparison with the control experiment No. 1 is about two times)
360163,7The area of the cracks near the end at a depth of 25 mm (the number of cracks compared with the experience No. 1 increased by 10-15%)
465164,0Area of cracks compared with the experience No. 1 is not increased.

Table 2

Evaluation of the effectiveness of cumulative chemical hammer under the action of external hydraulic pressure of 20 MPa (example 2)
WeightThe area of exposed surfaces, cm2
no experienceThe mass of water chemistry,thrownfrom cumulativefrom water chemistryComparable assessment of the nature of the perforators
Gpgitem GMgcharge, Sklongitudinal cracks, SCRtransverse cracks, Spop
1 (control.)022-85--
218,2220,8365100150Local gap reservoir (reservoir targets): - on the upper end of the radial cracks; the destruction of the target into two parts in the transverse direction at a distance of 230 mm from the top end. The increase in the area of the opening in comparison with the control experiment) 3.7 times
318,2220,8395320150Local fracturing: two slanted to the target axis) crack length 225 mm with exit to the outer surface of the target at the end of the channel; bit is the determination of the target into two parts in the transverse direction at a distance of 125 mm from the top end. The increase in the area of the opening 6.6 times
416,7220,7680160150Local fracturing: two slanted to the target axis) crack length of 100 mm from the exit end of the channel to the outer surface of the target with the formation of the chip (splinter splinter) dimensions HH mm; - the destruction of the target into two parts in the transverse direction at a distance of 250 mm from the top end. The increase in the area of dissection 4.6

1. The processing method of the reservoir, including the impact on the formation of the productive interval zone, the pressure of the gaseous products of the reaction between the oxidizer and the fuel samovosplameneniya pairs, when there is contact between them, characterized in that as the oxidant used a fluoride halogen, or their derivatives, or nitronium perchlorate, and as fuel use reservoir, thus ensuring contact between the oxidant and the reservoir is carried out by pulse recording oxidant into the reservoir when shooting a bullet or shaped punch placed in it, respectively, the bullet and the oxidant or cone facing and oxidant.

2. The method according to claim 1, characterized in that the ratio of the mass of oxidizer and bullet weight bullet punch or cone facing ku is Ustinova punch determine the condition

where GP- the mass of the oxidizer, g;

GM- bullet weight bullet punch or cone facing cumulative perforator,



 

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