Procedure for preparation of light-weight magnesium-silicate propping agent and propping agent

FIELD: gas and oil production.

SUBSTANCE: according to procedure for preparation of light-weight magnesium-silicate propping agent including heat treatment of magnesium containing component - source of magnesium oxide, combined mixture with silica-containing component, granulation of produced charge, produced granules roasting and their spread, charge contains (in terms of calcinated substance) wt %: SiO2 64-72, MgO 11-18, natural additives - the rest. Heat treatment is performed at temperature not over 1080°C. The distinguished feature of this light weight magnesium-silicate propping agent is its production by means of the above said procedure. The invention is developed in dependent points of formula.

EFFECT: reduced loose weight of propping agent at simultaneous increased strength, and increased strength of granules-raw product.

8 cl, 2 ex, 1 tbl

 

The invention relates to the oil and gas industry, namely the technology of proppants for use as propping agents in the extraction of oil or gas by hydraulic fracturing - hydraulic fracturing.

The proppants solid spherical granules, holding the crack from closing under high pressure and providing the necessary productivity of oil and/or gas wells by ensuring the formation of a conducting channel. The most used are ceramic proppants, because on the main technical characteristics they stand out from other types of rasklinivanie used for hydraulic fracturing. However, for economic reasons, their use is limited, and in large quantities apply rounded quartz sand with a polymer coating. In this regard, the actual search cheap natural raw materials to ensure acceptable performance proppants. Special attention is drawn minielite the proppants, raw materials which can serve up to 15% of the components of the earth's crust. Moreover, the use ministerialnego raw materials allows to obtain the proppant with low bulk weight. The decrease in the density of the proppant allows the use of fracture fluid used to fill cracks proppant, imoudu the lower the viscosity, that reduces the cost of this fluid, and reduces the likelihood that the fracture fluid remaining in the reservoir, blocking the flow of oil and gas, making it difficult for them to approach the well. The decrease of the density of the proppant facilitates and cheapens the process of injection of proppant into the well, and the proppant is able to penetrate deeper into the crack, thereby increasing the productivity of oil or gas wells.

A known method of manufacturing lightweight proppant from metasilicate calcium and/or magnesium, including consistently grinding, mixing with the modifier and sintering additives, such as titanium oxide, zirconium silicate, granulation to the bulk weight of the raw granules is not less than 1.2 g/cm3and fired at a temperature 1215-1290°C, and, accordingly, the proppant, is obtained in this way. (Patent RF №2235702, publ. 10.09 2004.)

The disadvantage of this method and proppant are low rasmol-ability and astringent properties metasilicate and as a result - not enough high strength, which when submitting material for drying and roasting it is partially destroyed, which leads to dust formation and loss of strength proppant, for compensation, which requires the use of expensive adhesive and sintering additives, which, in turn, increases the cost of production. In addition, the disadvantage is a significant mound is th weight of the resulting proppant.

Closest to the claimed method and proppant are a method of manufacturing a lightweight ministerialnego proppant from ministerialnego material on the basis of the forsterite content of the last 55-80%, comprising sintering at a temperature of at least 1070°C serpentine gravel, and then grinding it with the addition of Tripoli, granite, fly ash, granulating the mixture and sintering at a temperature of 1150-1350°C, and, accordingly, the proppant, is obtained in this way. (Patent RF №2235703, publ. 10.09 2004.)

The disadvantage of the resulting proppant is a low mechanical strength and high bulk density, related to the fact that the main crystalline phase is forsterite. Another disadvantage is the need for two high-temperature firing of the main mass of the material which increases its value.

The task, which is aimed by the invention is the reduction of bulk density of sintered pellets of proppant while increasing their strength, as well as increasing the strength of the raw granules.

The problem is solved in that in the method of manufacturing lightweight ministerialnego proppant comprising heat treatment of magnesium-containing component is a source of magnesium oxide, joint grinding it with a silica-containing component, the grain of the floor of the military burden, firing the obtained granules and sieving, the mixture contains (on calcined basis), wt%:

SiO264-72

MgO 11-18

natural impurities - the rest,

and the heat treatment is carried out at a temperature of 1080°C.

The problem is solved also by the fact that lightweight magicality the proppant is characterized by the fact that he received the above method.

Moreover, as specified magnesium-containing component using at least one of the groups: serpentine, brucite, caustic magnesite, talc, as components of the use of serpentine gravel and quarzolite sand the next time their ratio, wt.%: serpentine gravel 30-40, quarzolite sand 60-70, and firing is carried out at a temperature 1140-1190°C.

As a material source of magnesium oxide, can be used brucite, serpentine, caustic magnesite, talc or mixtures thereof, subject to the above chemical composition of the charge. However, the use of serpentinite is preferred because in compositions which are free magnesium oxide during the heat treatment sintering firing, along with metasilicates magnesium and silica is formed nizkoplotnye phase of forsterite.

As the silica component may use various kinds kremnezemami is related materials, such as a variety of silica Sands, siliceous rocks, siliceous waste industry. It is preferable to use quarzolite sand, quartz sand.

Serpentine the rubble and quarzolite Sands of different fields differ in chemical composition, therefore, the main factors influencing the characteristics of the proppant, is the ratio of the components of the charge and the ratio of MgO /SiO2in the proppant. Contained in the charge natural impurities - Al2O3, Na2O, K2O, Fe2O3and others, do not have a determining influence on the properties of the product obtained in the framework of the proposed technical solution.

It was found that physical mixture of crushed dried, generally, to a residual water content of not more than 3% quarzolite sand and subjected to a heat treatment at a temperature of not more than 1080°C serpentinite, taken in the stated ratio, possesses astringent properties. As a result, significantly increases the strength of the proppant raw, and almost no dusting at his sieving and firing in a rotary kiln. The quality of the granulation mass based on partially hydrated silicates of magnesium is much higher, increasing the sphericity and roundness of both crude and objgen the x granules, which ultimately improves the strength characteristics of the proppant. When using serpentinite, heat-treated at a temperature of not more than 1080°C, it is possible to avoid significant recrystallization grains of the material during sintering firing. In addition, the use of partially hydrated silicates of magnesium allows to optimize the grinding of the initial components such hydrated materials are grinded 3-4 times faster than whether their analogues or specially prepared the spectrum of the mixture components. As a result, the granulation served more homogeneous mixture with a developed surface. The high homogeneity of the mixture reduces the firing temperature proppant raw to 1140-1190°C. Low temperature firing and high homogeneity of the mixture gave the unexpected result after firing of the proppants in the structure of ceramics there is almost no phase of forsterite (less than 5%), reducing operational characteristics of the proppant. The increase in heat treatment temperature source, a magnesium-containing component above 1080°C leads to deterioration of the above parameters.

Firing pellets proppant raw at temperatures below 1140°C leads to the fact that the material remains substantially Neogene and has low strength, and the increase in firing temperature above 1190°C causes the formation of large is icesta cakes and increases the content in ceramics nizkoplotnykh phases forsterite and protestatio.

The decrease in bulk density of the pellets sintered proppant due to the composition of the material, suggesting a low content of magnesium silicate. The increase in the content of serpentinite more than 40 wt.% (MgO more than 18%) and fewer quarzolite sand less than 60 wt.% (SiO2at least 64%) leads to an increase in bulk density proppant. When the content of serpentinite less than 30 wt.% (MgO less than 11%), and quarzolite sand more than 70 wt.% (SiO2more than 72%) material has a narrow temperature interval of sintering firing pellets proppant raw, resulting in a significant amount of class.

According to the claimed method the resulting proppant with considerable strength and low density. The claimed method allows to realize the mechanism of transformation hardening, based on the phase transformation of clinoenstatite formed in ceramics during sintering firing. The structure of the granules is steklovata of variable composition with distributed inside the microparticles of clinoenstatite monoclinic crystal system, which under the application of external loads are transformed into orthorhombic. Growing inside the granules crack, meeting on his way monoclinic particle of clinoenstatite, loses some energy for the monoclinic-orthorhombic transition, resulting in increases with recepsionist material to the action of the breaking load. Moreover, the smaller the particle size, experiencing polymorphic transformation, the greater the number of them is in a unit volume of material, and hence the spread of the crack.

The implementation of the invention

Example 1.

Dried to a moisture content of 3% quarzolite sand and serpentine gravel, previously subjected to heat treatment, in the ratio of gravel - 35 wt.%, sand - 65 wt.% served on joint grinding in a laboratory vibrating mill, and crushed to a fraction of 40 microns or less (residue on sieve No. 004 less than 1%). Then the mixture was granulated. The resulting pellet fraction 40/70 mesh was measured strength proppant raw evaluated as destructive load applied to a single grains and expressed in grams. The proppant raw was annealed at a temperature of 1150°C and dissipated. The sintered proppant was determined bulk density and strength of the granules according to the standard method ISO 13503-2:2006(E). In addition, samples were made of proppant with different ratio of dried specified sand and serpentine gravel, and crushed stone has been pre-heat treated at different temperatures.

Example 2.

Dried to a moisture content of 3% quarzolite sand - 85% and caustic magnesite - 15 wt.% served on joint grinding in a laboratory vibrating mill, and crushed to a fraction of 40 μm or less (the rest is a sieve No. 004 less than 1%). Then the mixture was granulated. The resulting pellet fraction 40/70 mesh was measured strength proppant raw evaluated as destructive load applied to a single grains and expressed in grams. The proppant raw was annealed at a temperature of 1130°C and dissipated. The sintered proppant was determined bulk density and strength of the granules according to the standard method ISO 13503-2:2006(E).

The results of the measurements are shown in the table.

Table 1.
The results of the measurements
№p/pThe composition of the charge, wt.%The temperature of the heat treatment of the components of the charge, °CThe strength of the proppant raw, gBulk density sintered proppant, g/cm3Destructible sintered proppant, % at 10000 psi.
1Forsterite proppant according to the patent of Russian Federation №22357031100111.64.3
2The proppant-based metasilicate magnesium RF patent No. 2235702 1100141.53.7
3Serpentine gravel - 30, quarzolite sand - 70 (MgO≈11, SiO2≈72, impurity - 17)900281.421.3
4Serpentine gravel - 35, quarzolite sand - 65 (MgO≈15, SiO2≈67, impurity - 18)1000261.421.4
5Serpentine gravel - 40, quarzolite sand - 60 (MgO≈18, SiO2≈64, impurity - 18)1080241.421.5
6Serpentine gravel - 25, quarzolite sand - 75 (MgO≈10, SiO2≈73, impurity - 18)108017formed the spectrum of proppant-
7Serpentine gravel - 45, quarzolite sand - 55 (MgO≈19, SiO2≈63, impurities 18) 1080191.512.3
8Serpentine gravel - 35, quarzolite sand - 65 (MgO≈15, SiO2≈67, impurity - 18)drying to a moisture content of 3%381.421.0
9Serpentine gravel - 35, quarzolite sand - 65 (MgO≈15, SiO2≈67, impurity - 18)250361.421.1
10Serpentine gravel - 35, quarzolite sand - 65 (MgO≈15, SiO2≈67, impurity - 18)600331.421.2
11Serpentine gravel - 35, quarzolite sand - 65 (MgO≈15, SiO2≈67, impurity - 18)1100141.452.5
12Caustic magnesite - 15, quarzolite sand - 85 (MgO≈15, SiO2≈69, PR is MESI - 16)-181.431.8

Data analysis the table shows that the inventive method of manufacturing lightweight ministerialnego proppant and proppant can get a product (examples 3-5, 8-10), which has a high strength proppant raw and less bulk weight and greater strength of the sintered proppant in comparison with the known analogues.

1. A method of manufacturing a lightweight ministerialnego proppant comprising heat treatment of magnesium-containing component is a source of magnesium oxide, joint grinding it with a silica-containing component, granulation of the resulting mixture, and firing the obtained granules and sieving, characterized in that the mixture contains (on calcined basis), wt%:

SiO264-72
MgO11-18
natural impuritiesthe rest,

and the heat treatment is carried out at a temperature of 1080°C.

2. The method according to claim 1, characterized in that, as specified magnesium-containing component using at least one of the groups: serpentine, rusic, caustic magnesite, talc.

3. The method according to claim 1, characterized in that as component use of serpentine gravel and quarzolite sand the next time their ratio, wt.%:

serpentine gravel30-40
quarzolite sand60-70

4. The method according to claim 1, characterized in that the calcining is carried out at a temperature 1140-1190°C.

5. Lightweight magicality proppant, characterized in that it is obtained by the method according to claim 1.

6. The proppant according to claim 5, characterized in that, as specified magnesium-containing component using at least one of the groups: serpentine, brucite, caustic magnesite, talc.

7. The proppant according to claim 5, characterized in that as component use of serpentine gravel and quarzolite sand the next time their ratio, wt.%:

serpentine gravel30-40
quarzolite sand60-70

8. The proppant according to claim 5, wherein the firing is carried out at a temperature 1140-1190°C.



 

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