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Method for preventing deposits in oil extraction

A technology for oil extraction and scaling, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as performance degradation

Inactive Publication Date: 2003-08-27
联合科松有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, many known antiscalants, especially phosphates, have reduced performance in the presence of iron ions; high concentrations of iron ions may be generated due to corrosion of pipelines and equipment, resulting in iron scaling such as Fe(OH) 3 and FeCO 3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Determine the antiscaling effect of CMI (DP approximately equal to 10) on calcium carbonate. A saturated calcium carbonate solution is prepared by mixing calcium chloride solution and sodium carbonate solution. The maximum amount of calcium carbonate formed is 95 mg / l. 1 mg / L or 5 mg / L of antiscalant was added to the solution. The pH value of the solution was adjusted to 10.0, then stood at 75°C and shaken. After 20 hours, filter with a White Band funnel and determine the calcium content of the filtrate. The effect of antiscalant is calculated based on the calcium value of the experiment without antiscalant (0% antiscalant) and the calcium value without precipitation (100% antiscalant). This experiment obtained the results shown in Table 1.

[0021] at a concentration of 1mg / l

Anti-fouling effect

Concentration of 5mg / l

Scaling

CMIDS=1.0

88

100

CMIDS=2.0

21

100

Polyacrylate 4500 ...

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PUM

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Abstract

Carboxyl-containing fructans such as carboxymethylinulin can be successfully used to prevent deposition of scale composed of, for example, calcium, barium and strontium salts of sulphuric acid and carbonic acid in oil extraction, in that 0.5 - 200 ppm of a carboxyl-containing fructan that contains 0.3 - 3 carboxyl groups per mono-saccharide unit is incorporated in the process water, in the process equipment or in the oil-containing formation.

Description

technical field [0001] The present invention relates to a method for preventing deposition of metal salts in oil extraction. Background technique [0002] Water is widely used in oil extraction. Water is injected under pressure into the reservoir. The oil in the rock is displaced by the water into a nearby producing well. Rocks that contain oil also contain water, which is referred to as formation water. This formation water often contains potentially scale-forming metal ions such as barium, calcium, and strontium. Under certain conditions, these cations produce insoluble products. Many oil fields are located offshore, where seawater can be used to displace oil. Seawater contains high concentrations of sulfate and carbonate ions. When seawater mixes with formation water, insoluble salts such as barium sulfate, calcium sulfate, and calcium carbonate are formed. This creates deposits not only in porous rocks, but also in pipelines and other equipment used to extract oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/00C09K8/528E21B37/06
CPCC09K8/528
Inventor 亨德里卡·科尔内利娅·库齐亨德里克斯·威廉斯·卡罗琳娜·拉伊吉马克斯
Owner 联合科松有限公司
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