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Scale inhibitor used for oilfield alkali-surfactant-polymer flooding and application method thereof

A ternary compound, scale inhibitor technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in scale inhibitors, stuck pump, and corrosion of oil production systems, and achieve mild reaction conditions and production. Simple process and good anti-scaling effect

Inactive Publication Date: 2016-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminosilicate scale is the most difficult scale to remove among inorganic salt scales. It is difficult for general antiscalants to inhibit its formation, and it is difficult to remove chemically once the scale is formed. Key factor
[0003] Scale deposition caused by the presence of alkali not only causes pump jamming, affects the normal production and testing of the pumping unit, but also blocks the pores of the oil layer, reduces the sweep coefficient of the oil displacement agent, and damages the oil layer. affect ultimate recovery
In order to prevent scaling in oil wells, ordinary anti-scaling agents are generally added. Its main components are organic phosphoric acid or inorganic phosphoric acid. The effect is not ideal, and the addition of common antiscalants will destroy the oil displacement effect of the three-component system, and even have a certain degree of corrosion on the oil recovery system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The oilfield ASP flooding system of this embodiment is a weak base ASP flooding system: alkaline matter (Na 2 CO 3 ) concentration is 5000ppm, the polymer (polyacrylamide) concentration is 1700ppm, and the surfactant (carboxylate anionic surfactant) concentration is 2000ppm. The viscosity was measured with a Brookfield DV-II+ viscometer at a temperature of 45°C and the number of revolutions was 6r / min, and the interfacial tension was measured with a super pendant drop interfacial tensiometer TX-550 at a temperature of 45°C.

[0024] The antiscalant for oil field three-element composite flooding of this embodiment includes the following components in mass parts: 3.0 parts of sodium polyepoxysuccinate, 1.2 parts of sodium hydroxyethylene diphosphonate, sodium aminotrimethylene phosphonate 1.2 parts, 2 parts of polymaleic anhydride, 3.6 parts of water. All the components are mixed evenly to obtain the antiscalant agent for oilfield three-component flooding in this embodi...

Embodiment 2

[0029] The oilfield ASP flooding system of this embodiment is a weak base ASP flooding system: alkaline matter (Na 2 CO 3 ) concentration is 3000ppm, the polymer (polyacrylamide) concentration is 1500ppm, and the surfactant (carboxylate anionic surfactant) concentration is 2000ppm. The viscosity was measured with a Brookfield DV-II+ viscometer at a temperature of 45°C and the number of revolutions was 6r / min, and the interfacial tension was measured with a super pendant drop interfacial tensiometer TX-550 at a temperature of 45°C.

[0030] The antiscalant for oil field three-component flooding of this embodiment includes the following components in parts by mass: 2.0 parts of sodium polyepoxysuccinate, 1.0 part of sodium hydroxyethylene diphosphonate, sodium aminotrimethylene phosphonate 1.0 parts, polymaleic anhydride 1.5 parts, water 3.5 parts. All the components are mixed evenly to obtain the antiscalant agent for oilfield three-component flooding in this example.

[003...

Embodiment 3

[0035] The oil field ASP flooding system of the present embodiment is a strong alkali ASP flooding system: the concentration of alkaline matter (NaOH) is 2000ppm, the concentration of polymer (polyacrylamide) is 2000ppm, and the surfactant (carboxylate anion Surfactant) concentration is 2000ppm. The viscosity was measured with a Brookfield DV-II+ viscometer at a temperature of 45°C and the number of revolutions was 6r / min, and the interfacial tension was measured with a super pendant drop interfacial tensiometer TX-550 at a temperature of 45°C.

[0036] The antiscalant agent for oilfield triple compound flooding of this embodiment includes the following components in parts by mass: 2.5 parts of sodium polyepoxysuccinate, 1.0 part of sodium hydroxyethylene diphosphonate, sodium aminotrimethylene phosphonate 1.0 parts, polymaleic anhydride 1.5 parts, water 3.0 parts. All the components are mixed evenly to obtain the antiscalant agent for oilfield three-component flooding in thi...

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Abstract

The invention discloses a scale inhibitor used for oilfield alkali-surfactant-polymer flooding and an application method thereof, belonging to the technical field of oil production and scale inhibition in oil fields. The scale inhibitor used for the oilfield alkali-surfactant-polymer flooding comprises the following components by mass: 1 to 5 parts of polyepoxysuccinate, 1 to 2 parts of hydroxyethylidene diphosphonate, 1 to 2 parts of amino trimethylene phosphonate, 1.5 to 3 parts of polymaleic anhydride and 3 to 5 parts of water. The scale inhibitor used for the oilfield alkali-surfactant-polymer flooding provided by the invention has good scale inhibition effects on calcium carbonate, calcium sulfate, barium sulfate, calcium phosphate, etc., specifically has strong inhibition effect on aluminosilicate scale, and can reduce or even completely prevent the formation of the aluminosilicate scale; under an economic and practical treatment concentration, the scale inhibitor used for the oilfield alkali-surfactant-polymer flooding is added into an alkali-surfactant-polymer flooding well, and hardly affects viscosity and interfacial tension of an alkali-surfactant-polymer system; meanwhile, the scale inhibitor has the advantages of simple production process, mild reaction conditions, no pollution problems in application process, greenness and environmental protection.

Description

technical field [0001] The invention discloses a scale inhibitor for three-element compound flooding in an oil field and a use method thereof, belonging to the technical field of scale inhibition in oil production. Background technique [0002] With domestic oilfields entering high water cut period, ASP flooding has become an important EOR technology in order to increase and stabilize production. In the ASP flooding system composed of alkali-surfactant-polymer, the distribution system on the ground is prone to fouling, which affects the normal injection of the distribution system. Especially during the process of injection into the formation, when the alkaline chemical agent is injected into the formation, affected by factors such as formation temperature, pressure, ion composition, and pH value of the injection system, it will occur with formation rock and formation water, including dissolution, mixing and ionization. Exchange and other reactions. On the one hand, the sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 潘小翠彭森杨东伟吕永恒张旭升
Owner CHINA PETROLEUM & CHEM CORP
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