Method of fabricating backfill material for isolation of water producing zone in oil well

FIELD: oil and gas industry.

SUBSTANCE: suggested method refers to oil and gas producing industry and is designed for repair and isolating works in oil and gas wells, particularly for isolation of water producing zones in an oil well. A sodium silicate block is preliminary dissolved in presence of water at heating and continuous mixing. Then a polyacrylonitrile raw material and caustic soda are simultaneously introduced at a following ratio of components, mas.%: a sodium silicate block 10.0-20.0; water 65.0-85.0; a polyacrylonitrile raw material 3.0-8.0; caustic soda 2.0-5.0.

EFFECT: increased efficiency of water isolating operations due to improved isolating characteristics, to increased mechanical strength of a backfill mass, formed at structuring of obtained backfill material, with simultaneous upgraded heat resistance and reduced cost of the said material.

1 tbl

 

The proposal relates to the oil and gas industry, and is intended for repair and insulation works in oil and gas wells, and in particular to isolate water production zones in the well.

A method of obtaining cement mortar for repair and insulation works well [RF patent №2270328, EV 33/138, publ. 20.02.2006,, bull. No. 5], including the dissolution by heating in the presence of water, sodium silicate blocks with modifying additive, and the mixture obtained liquid glass - water solution of sodium silicate, water and an organic hardeners. The disadvantage produced using the known method of plugging solution is the use of special, as a rule, expensive organic hardeners for its structure, which increases its cost. When used as a hardener reservoir saline water is widely used for structuring cement compositions based on liquid glass formed plugging mass has a smaller structural-mechanical strength than plugging mass formed during curing of the mineralized water is usually used liquid glass according to GOST 13078.

Known gel-forming composition to increase oil production [RF patent №2213211, EV 43/22, publ. 27.09.3,, bull. No. 27]containing polymer AK the silt series - Gaitan - hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile, alkaline reagent and a crosslinking agent. As a cross-linking agent composition contains the distilled liquid, which consists of calcium hydroxide CA(Oh)2and calcium salts of caso3, CaCI2, CaSO4. The disadvantage of the above-mentioned composition is that the sulfates that are included with the distilled liquid that may clog the productive part of the reservoir, which will lead to lower oil production.

The closest technical solution to offer (prototype) is a method of obtaining an acrylic reagent Gaitan, including the dissolution in water of alkali (caustic soda) with continuous stirring and heating in alkaline solution of polyacrylonitrile raw materials to complete hydrolysis [RF patent №2169754, SC 7/02, publ. 27.06.2001,, bull. No. 18]. After hydrolysis of polyacrylonitrile materials in the alkaline solution is formed backfill material Gaitan. The lack of grouting material produced using the known method is that the gel formed by the interaction Gaitana with reservoir water at the temperature of formation is more than 70°has a low structural-mechanical properties. At a temperature of 100°from Gaitana boils water, begins the evolution of ammonia and salustiana balance, while further improving the temperature balance consueta. These factors limit the applicability of the reagent in high-temperature wells.

The technical objective of the proposed method is to increase the efficiency of the waterproofing works by improving the insulating properties and mechanical strength plugging mass formed by structuring received grouting material, while enhancing thermal stability and reduce the cost of grouting material.

The problem is solved by the proposed method of obtaining a grouting material to isolate water production zones in a well, comprising mixing under heating and stirring polyacrylonitrile materials and caustic soda until complete hydrolysis of polyacrylonitrile materials.

What's new is that previously in the presence of water under heating and stirring dissolved sodium silicate block and then injected simultaneously polyacrylonitrile raw materials and caustic soda in the following ratio, wt.%:

sodium silicate-block10,0-20,0
water65,0-85,0
polyacrylonitrile raw materials3,0-8,0
caustic soda2,0-5,0.

The entity offers the supply is as follows. In the reactor with water heated to a temperature of at least 75°C, under stirring introduced sodium silicate block and continue heating. After reaching the temperature of the reaction mixture 90-97°stirring is continued for 3-5 hours until the density 1150-1300 kg/m3. Then into the reactor under stirring simultaneously loaded estimated number of polyacrylonitrile materials and caustic soda. The process continues until the complete dissolution of silicate blocks and complete hydrolysis of polyacrylonitrile materials.

Well the structuring of grouting material is in the interaction with the electrolyte containing ions of polyvalent metals CA2+, Mg2+and others, for example, formation of mineralized water content of ions of CA2+and Mg2+not less than 20 g/l Electrolyte causes ionotropic structuring, leading to the formation in the polymeric mixture of graded-gel material, plugging the path of flow of water into the well. Plugging mass formed by the structuring of grouting material, due to the presence in the material of sodium silicate addition of hydrolyzed polyacrylonitrile has a high mechanical strength and enables the use of the resulting backfill material in wells with higher reservoir the the temperature. Reducing the cost of repair and insulation works is provided by reducing the cost of grouting material and reducing the amount of special equipment required for its injection in the well.

Thus, it allows to solve the technical problem is to increase the efficiency of the waterproofing works by increasing the mechanical strength of plugging mass formed by structuring received grouting material, while enhancing thermal stability and reduce the cost of grouting material.

Analysis of patent and scientific literature has allowed to draw a conclusion about the absence of technical solutions that contains a set of features of the proposed suggestions, so we can conclude that the criterion of "novelty" and "inventive step".

Example preparation of grouting material. In the reactor with 7.0 t (70 wt.%) water heated to a temperature of 75°C, under stirring enter 2 t (20 wt.%) sodium silicate blocks and continue heating. After reaching the temperature of the reaction mixture 95°with stirring, the preparation of grouting material continued for 4 hours. Then charged to the reactor 0.65 t (6.5 wt.%) polyacrylonitrile materials and 0.35 t (3.5%) caustic soda. The process of paramashiva the Oia continued until complete dissolution of silicate blocks and complete hydrolysis of polyacrylonitrile materials.

In order to compare water properties of cement material for prototype and prepared using the proposed method were conducted model tests. Water properties of the compositions were evaluated on models of the formation length 482 mm and an inner diameter of 27 mm, filled with quartz sand fraction of 0.2-0.3 mm, Initially through the formation model, filled with quartz sand, pumped stratiform mineralized Devonian water density of 1180 kg/m3. In the process of leveling make measurements of water flow and formula Darcy determine the initial permeability model. Then in the model sequentially inject the grouting material in the volume is equal to 0.4 pore volume model, and stratiform mineralized Devonian water density of 1180 kg/m3in an amount equal to 0.6 pore volume model. The model layer is left on the structuring waterproofing composition within 48 hours, after which through the model pumped salt water in the opposite direction with the determination of the permeability model. For assessment criterion of water properties of cement material take the residual resistance factor equal to the ratio of permeability by formation water before and after injection of grouting material. Data on concentrations of components in the cement material, and cut ltati research structures on models of the layers are given in table 1. When testing use backfill material for the prototype and the grouting material prepared using the proposed method.

From the research results it follows that the residual resistance factor using the proposed method at a temperature of 20°2.4 times, and at a temperature of 80°With 3 times higher than the prototype, so the water isolating properties of the backfill material prepared using the proposed method, above water properties of cement material on the prototype and it can effectively be used for the repair and insulation works in wells.

Table 1
The results of model tests of backfill materials
The content of components in the composition, wt.%The residual resistance factor
Polyacrylonitrile raw materialsCaustic sodaSodium silicateWaterAt 20°At 80°
The proposed method
5,03,518,073,54,84,8
6,53,5 20,070,05,25,3
8,04,01573,05,85,8
Prototype
5,03,5-rest1,91,6
6,53,5-rest2,21,8
8,04,0-rest2,41,9

A method of obtaining a grouting material to isolate water production zones in a well, comprising mixing under heating and stirring polyacrylonitrile materials and caustic soda until complete hydrolysis of polyacrylonitrile materials, wherein the pre in the presence of water under heating and stirring dissolved sodium silicate block and then injected simultaneously polyacrylonitrile raw materials and caustic soda in the following ratio, wt.%:

sodium silicate-block10,0-20,0
water65,0-85,0
polyacrylonitrile raw materials3,0-8,0
caustic is ode 2,0-5,0



 

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EFFECT: improved and valuable medicinal and pharmaceutical properties of agents.

110 cl, 13 tbl, 3 dwg, 40 ex

FIELD: chemistry.

SUBSTANCE: invention pertains to the field of obtaining subacid carboxylic cation exchange resins with a macro-porous structure. The engineering problem is the obtaining of a subacid carboxylic cation exchange resin with high values of capacity and strength characteristics: full exchange capacity of not less than 2.5 mg Eq/cm3, dynamic exchange capacity of not less than 1600 g Eq/m, and osmotic stability of not less than 98%. High capacity and strength characteristics can be achieved due to the structure of the polymer matrix and conditions for obtaining it. A method is proposed for obtaining the subacid carboxylic cation exchange resin though radical suspension copolymerisation of acrylonitrile and methyl methacrylate with divinyl benzene as a cross-agent, taken in percentage mass quantities of 9-12 % at concentration of 50-60 %, in the suspension medium in the presence of sponging agents (alkyl benzene, aviation kerosene) in percentage volume quantities of 40 % of the volume of monomers during heating and sustaining at 50°C temperature for 2 hours, 61°C for 2 hours, 65°C for 3 hours, 70°C for 2 hours, with subsequent basic hydrolysis of the nitrile group using a 25 % water solution of caustic sodium with gradual increase in temperature from 50°C to 110°C and sustenance at temperature of 110°C for a period of 10 hours.

EFFECT: obtaining of a subacid carboxylic cation exchange resin with high values of capacity and strength characteristics.

1 cl, 5 ex

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