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High-acid-dissolution composite plugging solution capable of improving formation pressure bearing capability

A technology of pressure-bearing capacity and leak-stopping fluid, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of low leak-stopping pressure-bearing capacity, low leak-stopping aging effect, and poor plugging capacity, etc. Good leakage effect, improve plugging capacity and pressure bearing capacity, and reduce dosage

Active Publication Date: 2016-11-09
KMS OIL FIELD CHEM & TECHNICAL SERVICES LTD BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Leakage caused by induced fracturing
However, when the conventional LCM plugging method and special plugging method introduced above are applied in practice, the plugging ability is poor, the plugging time is low, and the plugging pressure bearing capacity is low.

Method used

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  • High-acid-dissolution composite plugging solution capable of improving formation pressure bearing capability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Preparation of highly acid-soluble composite plugging fluid for improving formation pressure bearing capacity

[0070] (1) Raw material preparation

[0071] Degradable fiber FCL 1g; high-strength ductile plugging agent GYD 15g; acid-soluble gel plugging agent SHD 8g; drilling mud 76g.

[0072] Among them, the degradable fiber FCL and the acid-soluble gel plugging agent SHD were purchased from Beijing Kemax Oilfield Chemical Technology Co., Ltd.

[0073] High-strength ductile plugging agent GYD is prepared by the following method:

[0074] (a) Prepare raw materials:

[0075] Aluminum powder 55g; expandable graphite 12g; silicon carbide 3g; calcium oxide 10g; floating beads 10g; barium carbonate 3g; and manganese dioxide 0.5g;

[0076] Wherein, the particle size of the aluminum powder is 200-400 μm.

[0077] (b) Add aluminum powder into the crucible and heat to 720°C to completely melt the raw material.

[0078] (c) pulverizing expandable graphite and silicon carbide...

Embodiment 2

[0087] Preparation of highly acid-soluble composite plugging fluid for improving formation pressure bearing capacity

[0088] (1) Raw material preparation

[0089] Degradable fiber FCL 0.8g; high-strength ductile plugging agent GYD 10g; acid-soluble gel plugging agent SHD 6g; drilling mud 83.2g.

[0090] Among them, the degradable fiber FCL and the acid-soluble gel plugging agent SHD were purchased from Beijing Kemax Oilfield Chemical Technology Co., Ltd.

[0091] High-strength ductile plugging agent GYD is prepared by the following method:

[0092] (a) Prepare raw materials:

[0093] 45g of aluminum-magnesium alloy powder; 10g of expandable graphite; 2g of silicon carbide; 8g of calcium oxide; 8g of floating beads; 3g of barium carbonate; and 0.5g of manganese dioxide;

[0094] Wherein, the particle size of the aluminum-magnesium alloy powder is 200-400 μm.

[0095] (b) Add aluminum powder into the crucible and heat to 710°C to completely melt the raw material.

[0096] ...

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Abstract

The invention discloses a high-acid-dissolution composite plugging solution capable of improving formation pressure bearing capability. The high-acid-dissolution composite plugging solution comprises, by weight, 0.6 to 1.0% of degradable fiber FCL, 2 to 15% of a high-strength ductile plugging agent GYD and 3 to 8% of an acid-dissolving gel plugging agent SHD, with the balance being drilling fluid. According to the high-acid-dissolution composite plugging solution provided by the invention, the degradable fiber FCL can form a firm three-dimensional net structure in a leakage zone, which facilitates formation of bridge blinding from the high-strength ductile plugging agent GYD for control of leakage, so the plugging capability and bearing capability of a fractural formation are improved.

Description

technical field [0001] The invention relates to the technical field of oil well operation plugging, in particular to a high-acid-soluble composite plugging fluid for improving formation pressure bearing capacity. Background technique [0002] Lost circulation refers to a complex situation in which the working fluid (drilling fluid, workover fluid, cement slurry, etc.) in the well leaks into the formation during the drilling and workover of oil and gas exploration and development. The intuitive manifestation of lost circulation is the drop of the liquid level of the surface mud tank, or no drilling fluid returns from the wellhead, or the return of drilling fluid from the wellhead is less than the displacement of drilling fluid (excluding normal downhole consumption). The hazards of lost circulation include: loss of a large amount of drilling fluid, even making drilling impossible to maintain; consumption of a large amount of plugging materials; time-consuming drilling; affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426C09K2208/08
Inventor 张宁吕述奇张宇
Owner KMS OIL FIELD CHEM & TECHNICAL SERVICES LTD BEIJING
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