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High density fracturing liquid

A fracturing fluid and high-density technology, which is applied in the field of oilfield fracturing, can solve the problems that cannot meet the fracturing needs of high-temperature and high-pressure deep well oil and gas reservoirs, and low density of fracturing fluid, and achieve good anti-swelling effect, good comprehensive performance, and ensure The effect of construction safety

Active Publication Date: 2008-07-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiency that the existing fracturing fluid has low density and cannot meet the fracturing needs of high-temperature and high-pressure deep well oil and gas reservoirs, the purpose of the present invention is to provide a high-density fracturing fluid

Method used

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  • High density fracturing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Add 26% weighting agent sodium chloride to form a high-density fracturing fluid with a density of 1.2 g / cm 3 .

[0044] Formula: weighting agent uses sodium chloride, 26%;

[0045]Vegetable gum thickener adopts hydroxypropyl guar gum, 0.5%;

[0046] The crosslinking liquid adopts organic boron crosslinking agent, 0.3%;

[0047] The drainage aid agent is a compound of hydrocarbon chain and fluorocarbon surfactant, 0.5%;

[0048] pH regulator 1 adopts sodium carbonate, 0.15%;

[0049] pH regulator 2 adopts sodium hydroxide, 0.04%;

[0050] The gel breaker uses NBA-101 capsule gel breaker + ammonium persulfate, 0.02%;

[0051] The fungicide adopts formaldehyde, 0.05%;

[0052] Water, 72.44%.

[0053] Preparation method: Add to the liquid mixing tank according to the formula ratio, and stir at room temperature. The order of addition is: water, bactericide, weighting agent, plant glue thickener, drainage aid, pH regulator, gel breaker, and crosslinking age...

Embodiment 2

[0054] Example 2: Add two weighting agents, 21% sodium bromide and 15% sodium chloride, the density of the high-density fracturing fluid is 1.34g / cm 3 .

[0055] Formula: weighting agent 1 uses sodium bromide, 21%;

[0056] Weighting agent 2 adopts sodium chloride, 15%;

[0057] Vegetable gum thickener adopts hydroxypropyl guar gum, 0.55%;

[0058] The cross-linking liquid adopts organic boron cross-linking agent, 0.35%;

[0059] pH regulator 1 adopts sodium carbonate, 0.15%;

[0060] pH regulator 2 adopts sodium hydroxide, 0.04%;

[0061] The gel breaker adopts NBA-101 capsule gel breaker + ammonium persulfate, 0.05%.

[0062] The drainage aid is a compound of hydrocarbon chain and fluorocarbon surfactant, 0.5%;

[0063] The fungicide adopts formaldehyde, 0.03%;

[0064] Water, 62.38%.

[0065] Preparation method is identical with embodiment 1.

Embodiment 3

[0066] Example 3: Add two weighting agents, 44% sodium bromide and 4% sodium chloride, to form a high-density fracturing fluid with a density of 1.51g / cm 3 .

[0067] Formula: weighting agent 1 uses sodium bromide, 44%;

[0068] Weighting agent 2 adopts sodium chloride, 4%;

[0069] Vegetable gum thickener adopts hydroxypropyl carboxymethyl guar gum, 0.45%;

[0070] The cross-linking liquid adopts organic boron cross-linking agent, 0.35%;

[0071] pH regulator 1 adopts sodium carbonate, 0.15%;

[0072] pH regulator 2 adopts sodium hydroxide, 0.04%;

[0073] The gel breaker uses NBA-101 capsule gel breaker + ammonium persulfate, 0.05%;

[0074] The drainage aid is a compound of hydrocarbon chain and fluorocarbon surfactant, 0.5%;

[0075] The fungicide adopts formaldehyde, 0.04%;

[0076] Water, 50.42%.

[0077] Preparation method is identical with embodiment 1.

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Abstract

The invention offers high density fracturing fluid formula used inorganic salt to improve water-base fracturing fluid density. Its feature is that its weight ratio is as follows: weight additive 4-50%, vegetable gum thickener 0.3-1.0%, cross linking agent 0.1-2.0%, pH value regulator 0.5-1.0%, cracking agent 0.002-0.3%, cleanup additive 0.05-0.5%, fungicide 0.03-0.2%, and water 30-73%. The density of the high density fracturing fluid is adjustable and can exceed 1.51g / cm3. It has good high temperature resistant, shearing resistant, and so on. Thus it can supply reliable assurance for abnormal high pressure and ultra-deep well exploration test oil and exploitation.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing, and relates to a fracturing fluid, in particular to a high-density fracturing fluid suitable for fracturing reconstruction of high-pressure, deep wells and ultra-deep wells. Background technique [0002] At present, the widely used fracturing fluids are: [0003] 1. Water-based fracturing fluid: Water-based fracturing fluid is currently the most widely used, especially since the development of organoboron and capsule gel breakers, it can basically meet the needs of fracturing in medium and high temperature formations. Most water-based fracturing fluids use plant gums (such as guar gum, coumarin, or polymers, etc.) Damage to the formation ultimately affects oil and gas production. The density is only 1.03g / cm 3 Left and right, there is nothing that can be done for the treatment of high temperature, high pressure, and deep wells. [0004] 2 Oil-based fracturing fluid: Oil-based frac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66
Inventor 肖越峰卢拥军程兴生陈作王永辉杜长虹
Owner PETROCHINA CO LTD
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