Protection liquid for oil well operation

A technology for protecting fluids and oil wells, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as increasing crude oil flow resistance, changing rock wettability, increasing oil flow resistance, etc., to achieve low formation damage and low leakage The effect of small amount and easy on-site implementation

Inactive Publication Date: 2015-09-23
荆春芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low formation pressure coefficient, once the hydrostatic injection pressure of the well-killing fluid is higher than the formation pressure, a large amount of well-killing fluid will be poured into the formation, which will increase the water saturation of the formation, thereby changing the wettability of the rock and increasing the oil flow resistance; When encountering clay, it will expand or particle migration will cause blockage; change the capillary force to form a water lock to increase the flow resistance of crude oil; cleaned oil, iron filings, etc. will also fall to the vicinity of the wellbore to cause blockage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1, a protection fluid for oil well operations, the materials are composed of the following weight percentages: 20% acrylamide, 8% chromium hydroxide, 20% potassium carbonate, 10% urea, dodecyldimethyl benzyl Base ammonium chloride 0.1%, anhydrous sodium sulfite 0.01%, furfuryl alcohol 20%, sodium hydroxide 0.01%, glacial acetic acid 0.02%, alkynyloxymethylamine 0.1%.

Embodiment 2

[0008] Example 2, a protective liquid for oil well operations, the materials are composed of the following weight percentages: acrylamide 10%, chromium hydroxide 10%, potassium carbonate 10%, urea 20%, dodecyl dimethyl benzyl Base ammonium chloride 0.02%, anhydrous sodium sulfite 1%, furfuryl alcohol 10%, sodium hydroxide 0.02%, glacial acetic acid 0.01%, alkynyloxymethylamine 0.5%.

Embodiment 3

[0009] Embodiment 3, a protective liquid for oil well operations, the materials are composed of the following weight percentages: acrylamide 15%, chromium hydroxide 9%, potassium carbonate 15%, urea 15%, dodecyl dimethyl benzyl Base ammonium chloride 0.06%, anhydrous sodium sulfite 0.06%, furfuryl alcohol 15%, sodium hydroxide 0.015%, glacial acetic acid 0.015%, acetylenic oxymethylamine 0.3%.

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PUM

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Abstract

The invention relates to the technical field of petrochemical industry, and concretely relates to a protection liquid for oil well operation. The protection liquid comprises 10-20wt% of acrylamide, 8-10wt% of chromium hydroxide, 10-20wt% of potassium carbonate, 10-20wt% of urea, 0.02-0.1wt% of dodecyl dimethyl benzyl ammonium chloride, 0.01-1wt% of anhydrous sodium sulfite, 10-20wt% of furfuryl alcohol, 0.01-0.02wt% of sodium hydroxide, 0.01-0.02wt% of glacial acetic acid and 0.1-0.5wt% of alkynoxymethyl amine. The purpose of the invention is to provide the protection liquid for oil well operation, with the advantages of simple construction and ideal performances.

Description

Technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a protective liquid for oil well operations. Background technique [0002] With the continuous attention paid to oil layer protection technology, oil layer damage during the drilling and completion process has been contained to a certain extent, and the damage performance of the operation link to the formation has become more and more obvious. In particular, the long-term development of the oil field has generally caused the formation pressure to be at a low level. When this type of oil well is in operation, it is often necessary to perform well killing operation. On the one hand, it is to ensure safety during the operation and prevent the pressure from being held in a certain part of the pipe string. On the other hand, it is to clean the oil pollution on the pipe string. , Keep the construction site tidy. However, due to the low formation pressure coefficient, once th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502C09K8/52
Inventor 荆春芳
Owner 荆春芳
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