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Composition and method for removing filter cake

A technology of filter cake and fluid, applied in the field of composition and method for removing filter cake, can solve the problems such as unsatisfactory filter cake cleaning effect, achieve the effect of improving filter cake dissolution and low corrosion

Inactive Publication Date: 2013-10-30
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But tests have demonstrated unsatisfactory filter cake cleaning due to the weak acidity of the acid produced by this acid precursor

Method used

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  • Composition and method for removing filter cake

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Embodiment 1 formula

[0062] Emulsion of the present invention, it comprises the DA-1 (methyl tosylate) of 10 volume %, the S-400 (emulsifier) ​​of 0.5 volume %, the GBW-14C (enzyme) of 5 volume %, the GBW of 1 volume % -16C (enzyme) and 0.1% by volume of BF-7L (buffer) were finally added to the HTHP pool at the target temperature (180°F) and 500 psi under static conditions for the indicated time. Fresh water was used as solvent. The method for forming the emulsion involved adding 0.5 ml of S-400 to 83.4 ml of fresh water in a Warring mixer under vigorous stirring. After 15 seconds, 10 ml of DA-1 was added to the blender. After mixing for 45 seconds, BF-7L (0.1 ml), GBW-14C (5 ml) and GBW-16C (1 ml) were added and stirring was maintained for 10 seconds.

Embodiment 2

[0063] Embodiment 2 formula

[0064] Example 2 was similar in composition to Example 1 except that Example 2 did not include a buffer. Similar to that described in Example 1, the composition of Example 2 was added to the HTHP cell at the target temperature (180°F) and 500 psi under static conditions for the indicated times.

Embodiment 3 and 4

[0065] Example 3 and 4 formulations

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Abstract

An embodiment of the present disclosure is directed to a well servicing fluid emulsion. The well servicing fluid is formulated with components comprising an ester of an organic acid for which the pKa of the organic acid is less than 0; an aqueous based fluid and an emulsifier. The ester is dispersed in the aqueous based fluid to form the well servicing fluid emulsion.

Description

technical field [0001] The present invention generally relates to methods for use in hydrocarbon production wells to reduce and remove the filter from the well formation and to remove the filter cake. Background of the invention [0002] Water-based drilling fluids (DIFs) are widely used in horizontal and multilateral well drilling. DIF is formulated to deposit a relatively impermeable filter cake that seals the wellbore and minimizes fluid loss to the formation. During well completion operations, it is often necessary to remove deposited filter cakes to prevent loss of completion efficiency and productivity. However, this can be a challenging task, especially in long horizontal, extended-reach and / or multilateral wells with heterogeneous formation properties. In these cases, incomplete filter cake removal is a common occurrence with currently available reactive fluid systems. [0003] The composition of water-based DIF typically includes, for example, xanthan gum, starch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/28C09K8/524C09K8/528C09K8/90
CPCC09K8/528C09K8/28C09K8/26C09K8/524C09K8/905
Inventor K·史密斯王晓岚
Owner BAKER HUGHES INC
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