Oil-based drilling fluid blocking remover and preparation method thereof

A technology of oil-based drilling fluid and plug-removing agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost and poor plug-removing effect, achieve low cost, strong drainage capacity, increase The effect of moisturizing contact angle

Active Publication Date: 2018-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned prior art, in order to solve the problems existing in the prior art such as poor oil-based drilling fluid plugging removal effect and high cost, the present invention provides an oil-based drilling fluid plugging removal agent and a preparation method thereof

Method used

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  • Oil-based drilling fluid blocking remover and preparation method thereof
  • Oil-based drilling fluid blocking remover and preparation method thereof
  • Oil-based drilling fluid blocking remover and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0029] Experimental Example 1: Preferred Main Acid

[0030] Remove the inorganic matter in the oil-based mud, mainly clay (mainly montmorillonite). In the investigation of the acid solution system, under the conditions of the temperature of 60 ° C and the experimental time of 5 hours, the mass fraction of hydrochloric acid is 10%. , Composite acid (hydrochloric acid: hydrofluoric acid: nitric acid according to volume ratio 1:3:0.5), nitric acid, phosphoric acid to the mud dissolution rate is respectively 14.6%, 62.5%, 12.8% and 14.3%, wherein the compound acid to the mud dissolution effect most. Therefore, it is determined that the main acid for mud dissolution is compound acid.

[0031] Under the conditions of the experimental temperature of 60°C and the experimental time of 5 hours, the results of the mud dissolution experiment of the compound acid with different preparation ratios are as follows: figure 1 shown. The experimental results show that with the increase of the...

experiment example 2

[0032] Experimental example 2: preferred emulsifier

[0033]Organic matter in oil-based mud, mainly white oil. Since the plugging removal system is water-based, an emulsifier must be used to remove the oily matter. Only by selecting a suitable emulsifier can the oily matter such as white oil be fully emulsified and discharged from the near wellbore area and wellbore. Experimental method: Mix oil and acid (add 6% emulsifier) ​​in a certain ratio (30:20), stir evenly, and then measure the amount of demulsification at a certain temperature to determine its demulsification ability. The experimental results are shown in Table 1. It can be seen from Table 1 that the demulsification rate of the emulsifier alkylphenol ether sulfosuccinate sodium salt reaches 100% in 10 minutes, and the effect is the best. The emulsifier is preferably sodium salt of alkylphenol ether sulfosuccinate. The emulsifier is a trimeric phthaloamine structure. This organic amine surfactant can form a complex...

experiment example 3

[0040] Experimental example 3: Dispersant preferred

[0041] Since the oil-based mud is a mixture of oil, inorganic clay and various additives, a dispersant should be added to the plugging removal system to make the products after plugging removal form a relatively stable dispersion, which is not easy to re-agglomerate and can better carry out plugging removal. The residual liquid is completely discharged.

[0042] Experimental method: mix 0# diesel oil and acid liquid, add different kinds of dispersant respectively, the concentration of dispersant is 4%, measure the interfacial tension with JYW-200X interfacial tensiometer, the experimental data are shown in Table 3.

[0043] Table 3 Experimental data of dispersant screening

[0044] serial number

Dispersant

Average interfacial tension, mN / m

1

Sodium polyacrylate

1.8

2

Modified polycarboxylate

5.2

3

sodium polyepoxysuccinate

6.0

4

sodium polyaspartate

3.0 ...

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Abstract

The invention discloses an oil-based drilling fluid blocking remover. The oil-based drilling fluid blocking remover is prepared from components in percentage by weight as follows: 10%-20% of an acid liquid, 4%-6% of an emulsifier, 2%-4.5% of a dispersant, 1%-3% of a solubilizer, 1%-3% of an anti-water blocking agent, 1%-2% of a chelating agent, 0.1%-0.3% of a discharge aiding agent and the balanceof water, wherein the acid liquid is selected from hydrochloric acid, nitric acid, phosphoric acid and composite acid; the anti-water blocking agent comprises fatty alcohol-polyoxyethylene ether, alkyl sodium sulfonate, polyoxyethylene ester and water. The oil-based drilling fluid blocking remover has the benefits as follows: (1) the oil-based drilling fluid blocking remover has good comprehensive performance and is low in cost, the anti-water blocking agent in a blocking removing system can effectively protect an oil layer, and secondary damage to the oil layer is reduced; (2) the oil-baseddrilling fluid blocking remover is simple to prepare, other treating agents are not required on site, and all that is required is to add water to dilute the blocking remover to the designed concentration.

Description

technical field [0001] The invention relates to an oil-based drilling fluid plug-removing agent and a preparation method thereof, belonging to the technical field of drilling fluid plug-removal. Background technique [0002] Oil-based drilling fluids have been used since the 1920s. Compared with water-based drilling fluids, they have the advantages of high temperature resistance, salt and calcium intrusion resistance, good anti-slump performance, good lubrication performance, and less damage to oil and gas layers. It is an important means for difficult high-temperature deep wells, high-inclination directional wells, horizontal wells and various complex formations. However, the filter cake formed by oil-based drilling fluid can easily cause the plugging of reservoir permeability, resulting in damage to the reservoir. At present, there are many research methods on plugging removal of water-based drilling fluid, but relatively few researches on how to effectively remove pluggi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 杜勇滕学伟石世革张菅隋清国姜涛张勇赵晓东
Owner CHINA PETROLEUM & CHEM CORP
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