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A plugging agent system suitable for low-temperature oil reservoirs and its preparation method

A technology of low temperature oil and blocking agent, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of high cost, large environmental impact, no cross-linking reaction, etc., achieve good blocking ability and simple method , Easy to operate effect

Active Publication Date: 2017-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing medium temperature and high temperature plugging agent systems do not undergo cross-linking reaction or form substances for sealing formations under low temperature conditions, and thus cannot meet the requirements of field use and construction
Some of the reported low-temperature plugging agent systems require relatively high temperatures, but the low-temperature plugging agent system is mainly a cross-linked system with polymer as the main agent. Its preparation and on-site construction measures are complicated, and the cost is high. larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of high modulus water glass in the present embodiment is: add the water glass solution of 284.2g (SiO 2 The content is 28.2%, Na 2 The content of O is 10.4%, the modulus of water glass is 2.8) and 24g of 30% tetramethylammonium hydroxide aqueous solution, stir well; the mixed solution is heated to boiling, add 50g of nano-silica powder, and continue to heat until the mixed solution After cooling, add 84.5g of distilled water to the mixed solution to obtain a water glass with a modulus of 4.4 and a silicon dioxide content of 29.4%.

[0025] The plugging agent system suitable for low-temperature oil reservoirs in this example is composed of the following components in weight percentage: 3% water glass with a modulus of 4.4, 0.2% proton source donor, and water as the balance. The preparation method comprises the following steps: (1) prepare 40% water glass solution with a modulus of 4.4 and 10% proton source donor solution with distilled water; (2) ...

Embodiment 2～24

[0027] The preparation method of high modulus water glass in embodiment 2~24 is with embodiment 1.

[0028] The plugging agent system suitable for low-temperature oil reservoirs and its preparation method in Examples 2-24 are the same as in Example 1 except that the formula is shown in Table 1 below.

Embodiment 25

[0030] The preparation method of high modulus water glass in the present embodiment is: add the water glass solution of 175.8g (SiO 2 The content is 26.6%, Na 2 The content of O is 11.4%, the modulus of water glass is 2.4) and 32g of 30% tetramethylammonium hydroxide aqueous solution, stir well; the mixed solution is heated to boiling, add 70g of nano-silica powder, and continue to heat until the mixed solution After cooling, add 119.4g of distilled water to the mixed solution to obtain a water glass with a modulus of 5.8 and a silicon dioxide content of 29.4%.

[0031] The plugging agent system suitable for low-temperature oil reservoirs in this example is composed of the following components in weight percentage: 3% water glass with a modulus of 5.8, 0.1% proton source donor, and the balance is water. The preparation method comprises the following steps: (1) prepare 40% water glass solution with a modulus of 5.8 and 10% proton source donor solution with distilled water; (2)...

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Abstract

Belonging to the technical field of oilfield chemistry and petroleum engineering, the invention discloses a plugging agent system suitable for low temperature oil reservoirs and a preparation method thereof. The plugging agent system consists of the following components by weight percent: 3-20% of water glass with a modulus of 4.4-12, 0.01-1% a proton source donor, and the balance water. Specifically, the water glass with a modulus of 4.4-12 is prepared by reaction of low modulus water glass and nano-silicon dioxide under the action of tetramethylammonium hydroxide. According to the invention, high modulus water glass and the proton source donor are compounded to form the plugging agent system, which can undergo gel reaction in the temperature range of 10-50DEG C and have adjustable gel time and high gel strength. The system also has strong temperature resistant, aging resistant and erosion resistant abilities, and can meet the technological requirements of low temperature oil reservoir profile control and water shutoff. The method for preparation of the high modulus water glass and the plugging agent system is simple and easy to operate, and is suitable for industrial production application.

Description

technical field [0001] The invention specifically relates to a plugging agent system suitable for low-temperature oil reservoirs and a preparation method of the plugging agent system, belonging to the technical fields of oil field chemistry and petroleum engineering. Background technique [0002] Profile control and water plugging are the most direct and economical techniques used by oil production companies to reduce water production in oil wells and increase oil recovery. During the implementation of this measure, the preparation and performance of the plugging agent system play a decisive role. At present, a large number of plugging agent systems have been developed, which are mainly suitable for medium-temperature reservoirs (60-90°C) and high-temperature reservoirs (above 90°C). Plugging agent systems suitable for conventional oil reservoirs include polymer systems, emulsified heavy oil systems and inorganic gel systems, such as polyacrylamide oil well water plugging a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/46
CPCC09K8/5045C09K8/506
Inventor 罗懿李克智魏开鹏杨欢周勤刘岳龙卢瑜林
Owner CHINA PETROLEUM & CHEM CORP
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