Heavy cracking-fluid formula

A technology of fracturing fluid and formula, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as high wellhead pressure

Active Publication Date: 2009-07-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the high wellhead pressure of such wells and the fracturing problems that cannot be completed with current construction equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] The performance of the weighted fracturing fluids was tested individually in the laboratory.

[0007] The testing process is as follows:

[0008] 1. Fracturing fluid configuration and density test: Add 664g of weighting agent NaBr and 60g of weighting agent NaCl into the WARING mixer filled with 774g of water, dissolve them completely under high-speed stirring, and then slowly add the thickener 4.5g of hydroxypropyl guar gum, after stirring for 30min to reach a certain viscosity, then add 1.5g of pH regulator sodium carbonate and 0.25g of sodium hydroxide, and 5.0g of drainage aid DJ-02, and continue stirring for 15min to fully dissolve. Form a homogeneous solution. The density test uses a density meter, and the density of the above-mentioned weighted fracturing fluid is 1.5g / cm 3 . The weight ratio of each substance is shown in the following table:

[0009] water weighting agent Thickener Sodium carbonate sodium hydroxide Drainage aid Exam...

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Abstract

A weighted fracturing fluid formula, which belongs to the technical field of petroleum exploration and development oil and gas well reservoir transformation, is suitable for deep wells, ultra-deep wells, abnormally high pressure wells, abnormally high geostress wells and sand fracturing reservoir transformation, and the weighted fracturing fluid passes through inorganic salts Weighting, its composition and weight ratio are: water 500; weighting agent 180-483; thickener hydroxypropyl guar gum 2-3; pH regulator sodium carbonate 0.8-1; pH regulator sodium hydroxide 0.15 ~0.27; drainage aid 3.0~3.3. The density of the aggravated fracturing fluid is 1.25-1.5g / cm3, which can increase the pressure of the liquid column in the wellbore and reduce the pressure of the wellhead construction. Using the existing fracturing equipment, the well pressure of deep wells, ultra-deep wells, abnormally high pressure wells, and abnormally high geostress wells can be completed. cracks to achieve reservoir reconstruction.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development oil and gas well reservoir reformation, in particular to a fracturing fluid in the technical field of oil-water well reservoir fracturing treatment. Background technique [0002] In oil and gas exploration and development, the hydraulic sand fracturing technology for sandstone reservoirs is: use the surface high-pressure pump to inject liquid into the well with a displacement that greatly exceeds the absorption capacity of the formation, and pressurize the high pressure at the bottom of the well. After the high pressure exceeds the formation stress near the borehole wall and the tensile strength of the rock, fractures are formed in the formation. The fracturing fluid with proppant continues to be injected into the fracture to propel the fracture forward and fill the fracture with proppant. After the pump is stopped, filling fractures of sufficient length, width and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66
Inventor 张福祥彭建新程兴生李元斌姜学海王永辉
Owner PETROCHINA CO LTD
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