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Well entering fluid and anti-leaking gel and preparation method thereof

A fluid and jelly technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that the plugging slurry cannot be accumulated, and achieve the effect of good retention and accumulation, good temperature resistance and shear resistance.

Active Publication Date: 2013-11-06
CNPC XIBU DRILLING ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a kind of well-entering fluid and plugging jelly and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the existing plugging Leakage slurry cannot accumulate near the entrance of the leaking layer, so that it cannot stay at the entrance to play a plugging role

Method used

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  • Well entering fluid and anti-leaking gel and preparation method thereof

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Embodiment 1

[0018] Embodiment 1, the well-entry fluid, the raw materials are by weight percentage: the thickener is 0.25% to 1%, the pH regulator is 0.1% to 0.5% and the balance of water; wherein, the well-entry fluid is obtained by the following preparation method : The required amount of thickener, PH regulator and water are mixed uniformly to obtain the well fluid.

Embodiment 2

[0019] Embodiment 2, the well-entry fluid, the raw materials are by weight percentage: the thickening agent is 0.25% or 1%, the pH regulator is 0.1% or 0.5% and the balance of water; wherein, the well-entry fluid is obtained by the following preparation method : The required amount of thickener, PH regulator and water are mixed uniformly to obtain the well fluid.

Embodiment 3

[0020] Embodiment 3, as the preference of the above embodiment, the thickening agent is guar gum or modified guar gum or polyacrylamide or polyacrylamide derivative or hyperbranched polymer.

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Abstract

The invention relates to the technical field of petroleum drilling engineering leakage stoppage, in particular to well entering fluid and anti-leaking gel and a preparation method thereof. The well entering fluid comprises, by weight, 0.25%-1% of gelling agents, 0.1%-0.5% of pH modifiers and the balance water. The preparation method for the well entering fluid comprises the step of evenly mixing the gelling agents, the pH modifiers and the water of a needed quantity to obtain the well entering fluid. The anti-leaking gel can serve as a front anti-leaking agent to be retained and accumulated near an inlet inside a leaking layer, cement slurry is prevented from leaking into a stratum, and the anti-leaking gel has good temperature-resistant shear-resistant characteristics and can simultaneously wrap solid particles of different grain diameters and have good retaining accumulating effect.

Description

technical field [0001] The invention relates to the technical field of oil drilling engineering plugging, and relates to well-entry fluid, plugging jelly and a preparation method thereof. Background technique [0002] The well leakage problem has always been a major engineering technical problem that plagues oil exploration and development at home and abroad, and has not been completely resolved so far. The occurrence of lost circulation will not only bring inconvenience and loss to the drilling project (such as consuming drilling time, loss of drilling fluid and plugging materials, causing a series of complex situations such as stuck pipe, blowout, well collapse, and even lead to the scrapping of the wellbore), but also It brings great difficulties to the exploration and development of oil and gas resources. In recent years, the plugging technology has been greatly developed, but for the leakage of wider fractures and karst cave formations, the existing plugging slurry can...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 刘志良张伟王国斌戎克生李涛李跃明缪庆林张贵仪
Owner CNPC XIBU DRILLING ENG
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