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Low Density Microbubble Workover Fluid

A workover fluid and low-density technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of solid-phase particles blocking downhole tools, poor stability of ordinary foam, inconvenient use on site, etc., and achieve good flowback ability, plugging ability, and stability

Active Publication Date: 2016-08-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively regular particles of the temporary plugging agent, it is difficult to match the heterogeneity of the formation, and it is difficult to plug efficiently. Moreover, it is a problem for oil layers with high water content to remove plugging. risk, so the technology has certain limitations
In addition, although the low-density foam fluid currently used for low-pressure workover operations solves part of the leakage problem, ordinary foam has poor stability and weak pressure resistance and only exists in shallow layers (less than 1000 meters), and for some aerated foam fluids There are also problems such as high preparation cost and inconvenient on-site use

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] The preparation method of low-density microbubble workover fluid of the present invention comprises the following steps:

[0026] On-site preparation method:

[0027] Taking 200 parts of clear water as an example, 200 parts of clear water can represent 20 tons of clear water in actual production. First, add 200 parts of clean water to a 30-square-meter liquid mixing tank with a stirrer. It is best to adjust the liquid level of the clean water base liquid in the liquid mixing tank to the vicinity of the stirring blade to fully exert the stirring effect of the stirrer, thereby increasing the stirring force , followed by circulating 200 parts of clear water in the liquid mixing tank through the feeding funnel, and slowly adding 3 parts of hydroxypropyl starch ether into the feeding funnel, stirring for 10 minutes; then slowly and uniformly adding 1.2 parts of xanthan gum, and simultaneously adding 0.6 parts of dodecane Sodium sulfate, 0.4 parts of sodium dodecylbenzenesul...

example 1

[0031] Example 1: Take 300 parts of clear water as an example in the laboratory, first in a beaker with a volume of 500 milliliters, measure 300 parts of clear water with a graduated cylinder as base liquid, add 5.43 parts of hydroxypropyl starch ether earlier, and stir at high speed for 10 minutes; Slowly and evenly add (while stirring, add) 1.98 parts of xanthan gum, stir at high speed for 20 minutes; after stirring for 20 minutes, add 2.58 parts of sodium dodecyl sulfate and 2.58 parts of sodium dodecylbenzenesulfonate at the same time, stir at high speed 10-15 minutes; add 1.98 parts of thiourea and stir for 5-10 minutes, add 3 parts of potassium chloride and stir for 5 minutes to prepare the finished product.

[0032] The low-density micro-bubble workover fluid of the present invention has a temperature resistance of 110 degrees. figure 1 , the density is 0.85, see Table 1, the API filter loss is only 10.3ml / 30min, see Table 1, the high temperature and high pressure filte...

example 2

[0042] Example 2: Take 200 parts of clear water as an example in the laboratory, first in a beaker with a volume of 500 milliliters, measure 200 parts of clear water with a graduated cylinder as base liquid, add 2.32 parts of hydroxypropyl starch ether earlier, and stir at high speed for 10 minutes; Slowly and evenly add (while stirring, adding) 0.9 parts of xanthan gum, stir at high speed for 20 minutes; after stirring for 20 minutes, add 0.5 parts of sodium dodecyl sulfate and 0.5 parts of sodium dodecylbenzenesulfonate at the same time, stir at high speed 10-15 minutes; add 0.62 parts of thiourea and stir for 5-10 minutes, add 4 parts of potassium chloride and stir for 5 minutes to prepare the finished product.

[0043] The core permeability recovery rate of the low-density microbubble workover fluid of the present invention is above 89%, as shown in Table 6, and the oil-water interfacial tension is only 0.1076mN / m, as shown in Table 5, and has excellent oil layer protection...

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Abstract

The invention discloses a low-density microbubble workover fluid. The low-density microbubble workover fluid comprises clear water, hydroxypropyl starch ether, xanthan gum, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, thiourea and potassium chloride. The thiourea has purity more than 90%. The potassium chloride has purity more than 90%. The low-density microbubble workover fluid can provide technical support for low-pressure absorption well oil-extraction and well-repair operation and can be widely used for pump inspection and sand-flushing processes on low pressure sandstone, low pressure fractured hydrocarbon reservoir and low pressure heavy oil reservoir having large pressure difference and high serious-leakage occurrence probability.

Description

technical field [0001] The invention relates to a microbubble-like gas-liquid two-phase workover fluid used for workover operations of low-pressure leakage wells in oil fields. Background technique [0002] At present, all major oil fields have entered the middle and late stages of development, most of the oil wells and reservoirs have serious energy losses, the number of lost wells and lost zones has increased correspondingly, and the pressure coefficient has dropped rapidly. A large amount of liquid leakage occurs in well completion and workover operations, which not only pollutes the oil reservoir, but also brings significant economic losses. At present, the technologies used for low-pressure leakage wells mainly include the leakage prevention workover fluid system and low-density foam fluid mainly based on shielding temporary plugging technology. Shielding temporary plugging and anti-leakage workover fluid is mainly to add temporary plugging agents of different particle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38C09K8/42
CPCC09K8/38
Inventor 董军樊松林郭元庆韩芳黄义坚周小平辉建超
Owner PETROCHINA CO LTD
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