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High-density fracturing fluid and preparation method thereof

A fracturing fluid and high-density technology, applied in chemical instruments and methods, earth drilling, production fluids, etc., can solve problems such as corrosion of oil production equipment, high environmental pollution, limited construction pump pressure, etc., to reduce fracturing construction Pump pressure, good temperature resistance, and the effect of protecting oil and gas layers

Inactive Publication Date: 2017-04-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium bromide is highly polluting to the environment, and it is subject to many restrictions in practical application, and it is rarely used at present; the highest density of fracturing fluid using sodium nitrate as weighting agent can only reach 1.35g / cm 3 , the reduced construction pump pressure is limited, and sodium nitrate is highly corrosive, which will cause corrosion to fracturing equipment and oil production equipment after fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a high-density fracturing fluid. The raw material composition of the high-density fracturing fluid includes:

[0036] Water: 100 parts by weight;

[0037] The organic salt weighting agent is sodium formate: 45 parts by weight;

[0038] Drag reducing lubricant is sodium alkylbenzene sulfonate: 1.0 part by weight;

[0039] The thickening agent is hydroxypropyl guar gum: 0.3 parts by weight;

[0040] The crosslinking agent is gluconic acid organic boron crosslinking agent: 0.5 parts by weight;

[0041] The pH regulator is sodium carbonate: 0.3 parts by weight;

[0042] The breaker is ammonium persulfate: 0.08 parts by weight.

[0043] The density of the above-mentioned high-density fracturing fluid of this embodiment is 1.33g / cm 3 .

[0044] This embodiment also provides a method for preparing the above-mentioned high-density fracturing fluid, which specifically includes the following steps:

[0045] Add water to the liquid mixing tank, add thickener under the co...

Embodiment 2

[0053] This embodiment provides a high-density fracturing fluid. The raw material composition of the high-density fracturing fluid includes:

[0054] Water: 100 parts by weight;

[0055] The organic salt weighting agent is potassium formate: 70 parts by weight;

[0056] Drag reducing lubricant is sodium alkylbenzene sulfonate: 1.0 part by weight;

[0057] The thickening agent is hydroxypropyl guar gum: 0.3 parts by weight;

[0058] The crosslinking agent is gluconic acid organic boron crosslinking agent: 0.5 parts by weight;

[0059] The pH regulator is sodium carbonate: 0.3 parts by weight;

[0060] The breaker is ammonium persulfate: 0.08 parts by weight.

[0061] The density of the above-mentioned high-density fracturing fluid in this embodiment is 1.50g / cm 3 .

Embodiment 3

[0063] This embodiment provides a high-density fracturing fluid. The raw material composition of the high-density fracturing fluid includes:

[0064] Water: 100 parts by weight;

[0065] The organic salt weighting agent is cesium formate: 75 parts by weight;

[0066] Drag reducing lubricant is sodium alkylbenzene sulfonate: 1.0 part by weight;

[0067] The thickening agent is hydroxypropyl guar gum: 0.3 parts by weight;

[0068] The crosslinking agent is gluconic acid organic boron crosslinking agent: 0.5 parts by weight;

[0069] The pH regulator is sodium carbonate: 0.3 parts by weight;

[0070] The breaker is ammonium persulfate: 0.08 parts by weight.

[0071] The density of the above-mentioned high-density fracturing fluid in this embodiment is 2.30 g / cm 3 .

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Abstract

The invention provides a high-density fracturing fluid and a preparation method thereof. The high-density fracturing fluid comprises the following raw materials: 100 parts by weight of water, 20 to 80 parts by weight of an organic salt weighting agent, 0.5 to 2.0 parts by weight of a drag-reducing lubricating agent, 0.1 to 0.5 part by weight of a thickening agent, 0.1 to 0.6 part by weight of a cross-linking agent, 0.1 to 0.3 part by weight of a pH regulator and 0.01 to 0.1 part by weight of a gel breaker. The preparation method of the high-density fracturing fluid comprises the steps of adding the thickening agent into water, and circularly stirring the materials; adding the organic salt weighting agent under circular stirring; adding the drag-reducing lubricating agent and the pH regulator under circular stirring to regulate the pH value to be 10 to 12; and adding the cross-linking agent and the gel breaker through a cross-linking pump, so as to obtain the high-density fracturing fluid. According to the high-density fracturing fluid, requirements on construction equipment and tools can be reduced, construction safety is improved, and the success rate of construction is increased.

Description

Technical field [0001] The invention relates to a fracturing fluid and a preparation method thereof, in particular to a high-density fracturing fluid and a preparation method thereof suitable for fracturing technologies for high-pressure wells, deep wells, ultra-deep wells and tight oil and gas reservoirs, and belongs to oil and gas field pressure Splitting the technical field. Background technique [0002] Fracturing technology is one of the important measures to improve the reservoir of oil and gas wells, increase production of oil wells, increase injection of water wells, and improve the productivity and recovery of oil and gas wells. With the continuous deepening of oil and gas field exploration and development, there are more and more special oil and gas wells such as high pressure wells, deep wells, ultra-deep wells, and tight oil and gas reservoir wells. When the fracturing technology is applied in this type of oil and gas wells, a major problem is that the construction p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90E21B43/26
CPCC09K8/685C09K8/665C09K8/887C09K8/90C09K2208/26C09K2208/34E21B43/26
Inventor 柳燕丽匡韶华郭定雄张群刘晶晶周飞王磊梁凌熏
Owner PETROCHINA CO LTD
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