Heavy cracking-fluid formula

A fracturing fluid and formulation technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of high wellhead pressure

Active Publication Date: 2007-04-04
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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The performance of the weighted fracturing fluids was tested individually in the laboratory.

[0008] The testing process is as follows:

[0009] water

weighting agent

Thickener

Sodium carbonate

sodium hydroxide

Drainage aid

Example 1(g)

774

664NaBr+

60NaCl

4.5

1.5

0.25

DJ-02, 5

weight ratio

500

468

2.9

0.97

0.16

3.23

[0010] 2. Use the fracturing fluid base fluid configured above, and use organoboron crosslinking agent to crosslink. The crosslinking ratio is 100 to 0.4. The viscosity and temperature properties of the fracturing fluid jelly are shown in the table below.

[0011] T(min)

n(mPa.S)

T(℃)

initial

250.8

24.1

10

257.1

52.6

20

290.6

94.8

30

176.5

108.3

40

273.2

112.7

50

193.0

115...

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PUM

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Abstract

An emphasized fracturing liquid formula consists of water 500 proportion, emphasizing agent 180-483 proportion, gelatinizer hydroxypropyl guar gum 2-3 proportion, pH value adjuster sodium carbonate 0.8-1 proportion, pH value adjuster sodium hydrate 0.15-0.27 proportion, auxiliary 3.0-3.3 proportion, and emphasized fracturing liquid density is between 1.25-1.5g/cm3. It can be used to increase liquid column pressure in well and decrease construction pressure on well opening and finish oil-well fracture of deep well, super-deep well, abnormal high-pressure well and realize storage-layer transformation.

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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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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