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Oil-based mud flushing liquor and preparation method thereof

An oil-based mud and flushing fluid technology, applied in drilling equipment and other directions, can solve the problems of poor cementing quality, low replacement rate and poor compatibility.

Inactive Publication Date: 2003-03-26
DAQING PETROLEUM ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of poor compatibility of existing flushing fluids, low replacement rate, and poor cementing quality due to poor affinity between the two interfaces, the invention provides an oil-based mud flushing fluid and a preparation method thereof. The flushing fluid prepared by the method It can better remove oil-based mud and oil-based mud cake, improve the affinity of the two interfaces, improve the bonding performance and displacement efficiency of the cement sheath interface, and ensure the quality of cementing

Method used

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  • Oil-based mud flushing liquor and preparation method thereof

Examples

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preparation example Construction

[0009] The preparation method of the flushing solution is: add 2.5-3.5 parts of sodium hydroxide and 4.0-5.0 parts of ethylenediaminetetraacetic acid into clear water by weight and stir evenly to fully dissolve them, then add 12.0-12.5 parts of oleic acid and stir for 20- 30 minutes, then add 2.0-2.2 parts of sodium lauryl sulfate and 5.0-5.5 parts of alkyl fatty alcohol polyoxyethylene ether and stir for 55-65 minutes, and finally add silicone defoamer. The molecular formula of sodium lauryl sulfate is C 12 h 25 OSO 3 Na, the molecular formula of fatty alcohol polyoxyethylene ether is RO(CH 2 CH 2 O)nH, n in the formula is 8-10, R is C 12 , where the fatty alcohol is a single fatty alcohol, and the molecular formula of oleic acid is CH 3 (CH 2 ) 7 -CH=CH-(CH 2 ) 7 COOH, the molecular formula of sodium edetate is (NaOOCH 2 c) 2 -N(CH 2 ) 2 N-(CH 2 COONa) 2 .

[0010]

[0011] In the above scheme, the ratio of each component and the effect can be seen....

Embodiment 1

[0012] Example 1. During the construction of Fangshen 10 well in Daqing, the flushing fluid prepared in the scheme 1 of the above table was applied, and the flushing rate was 100%, and it had a strong flushing ability to the two interfaces, which was beneficial to improve the displacement efficiency of the drilling fluid. Improve the bonding strength of cement sheath interface.

Embodiment 2

[0013] Example 2. During the construction of Fangshen 701 well in Daqing, the flushing fluid prepared in the above scheme 2 was applied, and the flushing rate reached 100%. Good capacity, no adverse effects such as thickening and flocculation, the bonding strength of the two interfaces is improved, and the cementing quality is good.

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Abstract

The invention refers to an oil rinse liquid for mud and the manufacturing method. It resolves the problem that the second interface cementation is bad. Its character lies in: add 2.5-3.5 shares sodium hydroxide and 4.0-5.0 shares ethyl diamine fourthacetic acid to clean water and blend to make them dissolve completely, then add 12.0-12.5 share oleic acid and blend for 20-30 minutes, add 2.0-2.2 shares dideakly natrium sulphate and 5.0-5.5 shares alkyl fatty ethanol poly-oxy ethene aether and blend for 55-65 minutes, finally add in the organic silicon anti-foamer. It can change the "oil wet" into "water wet", improve the cementation of cement interface and enhance the quality of fixing mine.

Description

Technical field: [0001] The invention relates to oilfield drilling and cementing technology, and belongs to the oil-based mud flushing fluid used in the field of cementing prefluid and a preparation method thereof. Background technique: [0002] In oilfield cementing construction, before injecting cement, a pre-fluid is pumped to purify the secondary interface to improve the cementing quality. When drilling with oil-based mud, the drilling fluid and the cement slurry are in direct contact, and the drilling fluid will "cement immerse", resulting in viscous flocculation, reduced fluidity, increased viscosity and shear force, and adhesion on the well wall and casing wall. This kind of viscous flocculation material and oil slurry, oil film, or stay in the irregular well diameter, it is difficult to replace it, which will lead to poor cementing performance of the cement sheath interface, which will seriously affect the quality of the cementing project. [0003] At present, altho...

Claims

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Application Information

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Inventor 徐明杨智光肖海东
Owner DAQING PETROLEUM ADMINISTRATION
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