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Novel JQ well killing protection liquid

A protective fluid and well killing technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of affecting the effect of measures, low surface activity, formation damage, etc., and achieve the ability to prevent blowout effect and good fluid production effect , easy to formulate effects

Inactive Publication Date: 2013-06-26
李瑞清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the solid-free killing fluids currently used are calcium and magnesium ions, such as MgCl 2 or CaCl 2 As a weighting agent material, the surfactant in the well killing fluid can interact with Ca 2+ , Mg 2+ Ion reaction, forming calcium salt and magnesium salt with low surface activity, resulting in flocculation and cementation, causing damage to the formation and affecting the effect of measures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A kind of preparation method of novel JQ well killing protection fluid, according to mass percentage, proportioning is as follows:

[0022] Component Proportion (%) sodium nitrate 10 Zinc nitrate 2 polyacrylamide 0.3 Sodium petroleum sulfonate 86.7 Nitrilotriacetic acid 1

[0023] The above-mentioned polyacrylamide is produced by Shanghai Dongfeng Chemical Co., Ltd., viscosity: ≥38.0mpa.s, insoluble matter: ≤0.2%, dissolution rate ≤2.0hr; sodium petroleum sulfonate is produced by Zhengzhou Shenglong Chemical Co., Ltd., the appearance is red, transparent and viscous Viscous, no precipitation. Nitrilotriacetic acid is produced by Shenyang Shimao Chemical Trading Co., Ltd., a white crystalline powder with a content of ≥99.5%.

[0024] A new type of JQ well killing protection fluid in this embodiment, the above ingredients are based on the mass percentage, sodium nitrate, zinc nitrate, polyacrylamide, sodium p...

Embodiment 2

[0025] Embodiment 2: As described in Embodiment 1, the difference is that the kill fluid composition is as follows according to the mass percentage:

[0026] Component Proportion (%) sodium nitrate 45 Zinc nitrate 2 polyacrylamide 0.4 Sodium petroleum sulfonate 50.6 Nitrilotriacetic acid 2

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Abstract

The invention relates to a novel JQ well killing protection liquid for oilfields. The novel JQ well killing protection liquid solves a problem that the measure oil increase effect is reduced because a fractured string is tripped out when a pressure decreases to a certain value (1.5MPa generally) after a ternary composite oil flooding well is fractured. The novel JQ well killing protection liquid is characterized in that the novel JQ well killing protection liquid comprises 10-45% by mass of sodium nitrate, 2% by mass of zinc nitrate, 0.3-0.4% by mass of a polymer, 50.6-86.7% by mass of a surfactant and 1-2% by mass of nitrilotriacetic acid. The well killing protection liquid is a solid-phase-free well killing liquid, can be used for the well killing work under a high pressure, can improve the measure oil increase effect, has the advantages of good compatibleness with a ternary liquid, stable foam, easy preparation, and cheap and easily available raw materials, and has clay expansion prevention and oil reservoir protection effects.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry and relates to a novel JQ well killing protection fluid. Background technique [0002] During the well killing operation after the fracturing of the ASP flooding well, the pressure of the casing increases due to the fracturing of the ASP flooding well, which affects the extraction of the fracturing string. As far as the current technological measures are concerned, if the pressure-reducing method of self-spraying production is used to pull out the fracturing string, the liquid production capacity of the thin poor layer will be inhibited. After the wellhead pressure drops to 1.5Mpa before starting the pump, the oil increase effect of the measures will be greatly reduced, and the water content will increase. Therefore, it is an important condition to ensure the effect of the measures to adopt the solid-free kill hydraulic downhole pump in time after the fracturing of the ASP flooding...

Claims

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Application Information

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IPC IPC(8): C09K8/64
Inventor 李瑞清王宪辉
Owner 李瑞清
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