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Leaking stoppage slurry for fracture loss and preparation method

A technology of plugging slurry and base slurry, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor adaptability of skeleton materials, inability to match cracks, and difficult selection of plugging materials, so as to avoid repeated leakage, Good temperature resistance, good plugging effect

Inactive Publication Date: 2019-05-28
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the difference in dispersion medium between water-based drilling fluid and oil-based drilling fluid, most of the lost circulation materials cannot be used in both water-based drilling fluid and oil-based drilling fluid, which brings difficulties to the selection of lost circulation materials.
At the same time, the plugging material is aimed at the leakage of cracks, and the skeleton material has poor adaptability and cannot be well matched with the cracks, which results in an unsatisfactory plugging effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A plugging slurry for crack leakage consists of bentonite slurry, polyester sponge (filament, length 0.5mm~20mm), diatomaceous earth, mica powder, ultrafine calcium carbonate (800 mesh), flexible graphite, Composed of elastic rubber particles, microcrystalline cellulose, and barite powder (weighted material),

[0025] Wherein the weight percent of each component and bentonite slurry is:

[0026] Polyester sponge 1.5%,

[0027] Diatomaceous earth 7%,

[0028] Mica powder 3%

[0029] Superfine calcium carbonate 5%,

[0030] Flexible graphite 4%,

[0031] Elastic rubber particles 2%,

[0032] Microcrystalline cellulose 0.1%,

[0033] Weighting material (add in appropriate amount according to the specific gravity of drilling fluid).

[0034] A method for preparing a plugging slurry for fractured leakage, the implementation steps of which are as follows:

[0035] Add diatomaceous earth, mica powder, superfine calcium carbonate, flexible graphite, elastic rubber parti...

Embodiment 2

[0040] A plugging slurry for crack leakage is composed of bentonite slurry, polyester sponge (cube, side length 5mm~50mm), diatomaceous earth, mica powder, ultrafine calcium carbonate (2500 mesh), flexible graphite, elastic rubber granules, natural cellulose, limestone powder (weighting material),

[0041] Wherein the weight percent of each component and bentonite slurry is:

[0042] Polyester sponge 3%,

[0043] Diatomaceous earth 3%,

[0044] Mica powder 1%

[0045] Ultrafine calcium carbonate 10%,

[0046] Flexible graphite 8%,

[0047] Elastic rubber particles 3%,

[0048] Natural cellulose 1%,

[0049] Weighting material (add in appropriate amount according to the specific gravity of drilling fluid).

[0050] A method for preparing a plugging slurry for fractured leakage, the implementation steps of which are as follows:

[0051] Add diatomaceous earth, mica powder, superfine calcium carbonate, flexible graphite, elastic rubber particles, natural cellulose, polyes...

Embodiment 3

[0055] A plugging slurry for crack leakage is composed of white oil, polyester sponge (tetrahedron or quasi-tetrahedron, side length 5mm~30mm), organic soil, mica powder, superfine calcium carbonate (500 mesh), flexible Composed of graphite, elastic rubber particles, cellulose fibers, galena powder (weighted material),

[0056] Wherein the weight percent of each component and bentonite slurry is:

[0057] Polyester sponge 1.5%,

[0058] Organic soil 5%,

[0059] Mica powder 3%

[0060] Superfine calcium carbonate 5%,

[0061] Flexible graphite 5%,

[0062] Elastic rubber particles 3%,

[0063] Cellulose fiber 0.1%,

[0064] Weighting material (add in appropriate amount according to the specific gravity of drilling fluid).

[0065] A method for preparing a plugging slurry for fractured leakage, the implementation steps of which are as follows:

[0066] Add organic soil, mica powder, superfine calcium carbonate, flexible graphite, elastic rubber particles, cellulose fibe...

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Abstract

The invention provides leaking stoppage slurry for fracture loss and a preparation method. The leaking stoppage slurry comprises base slurry, active clay, mica powder, ultrafine calcium carbonate, graphite, elastic rubber particles and microfiber, and is characterized by further comprising sponge, and the sponge is selected from one of polyester sponge and polyether sponge; the base slurry comprises bentonite slurry, diesel oil, white oil, gas to liquid or biological diesel oil. The preparation method comprises the following steps of adding the active clay, the mica powder, the ultrafine calcium carbonate, the graphite, the microfiber, the elastic rubber particles and the sponge successively into the base slurry and stirring continuously at a high speed until being uniform in the process of adding. The framework material of the leaking stoppage slurry has good elasticity, is easy to fracture inside to form a bridge, and can effectively improve the success rate of leaking stoppage; meanwhile, the leaking stoppage agent is wholly prepared from inert materials, can be simultaneously used in water-based drilling fluid and oil-based drilling fluid, and has high applicability.

Description

technical field [0001] The invention relates to the field of chemical additives for petroleum drilling, in particular to a plugging slurry for fractured leakage and a preparation method thereof. Background technique [0002] At present, the commonly used plugging materials in oil drilling plugging construction are mostly permanent bridging plugging materials and chemical gel plugging materials. Chemical plugging mainly plays a plugging role through the chemical reaction of polymers, including cross-linking reaction, curing reaction and other methods. Chemical plugging has a good plugging effect on malignant leakage, but the reaction of chemical plugging is more intense, the construction is complicated, and the risk is higher. The bridging plugging material has a simple construction process and low cost, and is the most commonly used in the field. However, some materials have poor temperature resistance and are prone to decomposition and failure at high temperatures, resulti...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/03
Inventor 刘振东李公让张敬辉周守菊明玉广
Owner SINOPEC SSC
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