High-density low-friction fracturing fluid

A low-friction, fracturing fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of increased formation damage, high cost of bromine salt, prolonged cross-linking time, etc., and achieve less formation damage. , good compatibility, cheap effect

CN102676148BInactive Publication Date: 2013-03-13SOUTHWEST PETROLEUM UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-03-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to high-density low-friction fracturing fluid. The high-density low-friction fracturing fluid is made of, by weight, 20-46.5% of weighting agent sodium nitrate, 0.4-0.6% of thickener hydroxypropyl guar gum, 0.4-1.0% of cleanup additive Gemini surfactant, 0.1-0.3% of pH (potential of hydrogen) modifier, 0.1-0.3% of bactericide lauryltrimethylammonium chloride or dodecyl dimethyl benzyl ammonium bromide, 0.5-1.0% of clay stabilizer quaternary ammonium salt, 0.5-1.0% of temperature stabilizer organic amine composite, and the balance water. Sodium nitrate is used for increasing weight, the density at the normal temperature can reach 1.35g / cm<3>, and the high-density low-friction fracturing fluid is long in delayed crosslinking time, low in friction, low in filter loss, high in high-temperature rheological property, and especially applicable to fracture modification of ultradeep compact reservoirs under unusual high pressure, wellhead construction pressure can be reduced remarkably. Further, the high-density low-friction fracturing fluid is applicable to massive popularization and application to mine fields, low in cost and low in stratum damage, and has wide market prospect.
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Description

technical field

[0001] The invention relates to the technical field of reservoir transformation in petroleum engineering, in particular to fracturing fluid in hydraulic fracturing construction. Background technique

[0002] Several abnormally high-pressure, ultra-deep and tight oil and gas reservoirs have been discovered in the central and western regions of my country. Such oil and gas resources require fracturing to obtain high yields. During high-pressure deep well reservoir fracturing operations, the required construction pressure often exceeds the pressure limit of the wellhead and pipe string, which cannot guarantee the safety of construction and the effect of measures, and even the construction operation cannot be carried out at all with the current technology and equipment. In order to solve this problem, a method of increasing the weight of the fluid column in the wellbore to reduce the wellhead pressure was proposed, thus resulting in a weighted fracturing fluid sy...

Examples

Embodiment 1

[0043] (1) Fracturing fluid formula 1 of the present invention (density is 1.16g / cm 3 )

[0044] Weighting agent sodium nitrate weight ratio: 20%

[0045] Thickener hydroxypropyl guar gum weight ratio: 0.50%

[0046] Drainage aid gemini surfactant weight ratio: 0.5%,

[0047] pH regulator Na 2 CO 3 Weight ratio: 0.1%

[0048] Fungicide dodecyltrimethylammonium chloride weight ratio: 0.15%

[0049] Clay stabilizer polyquaternium weight ratio: 0.5%

[0050] The temperature stabilizer is a compound formed by triethanolamine, methanol and polyoxyethylene sorbitan monolaurate Weight ratio: 0.5%

[0051] Water: 77.75%.

[0052] (2) Preparation of 1000g of the above-mentioned aggravated fracturing fluid

[0053]Add 777.5g of water to the waring mixer, then add 200g of sodium nitrate, start the mixer to fully dissolve it; add 5.0g of thickener hydroxypropyl guar gum under continuous stirring, swell for 30 minutes and thicken, then add 1g of sodium carbonate in turn , fungici...

Embodiment 2

[0057] (1) Fracturing fluid formula 2 of the present invention (density is 1.30g / cm 3 )

[0058] Weighting agent sodium nitrate weight ratio: 40%

[0059] Thickener hydroxypropyl guar gum weight ratio: 0.52%

[0060] Drainage aid gemini surfactant weight ratio: 0.5%,

[0061] pH regulator Na 2 CO 3 Weight ratio: 0.1%

[0062] Fungicide dodecyltrimethylammonium chloride weight ratio: 0.15%

[0063] Clay stabilizer polyquaternium weight ratio: 0.5%

[0064] Temperature stabilizer triethanolamine, methanol and polyoxyethylene sorbitan monolaurate compound weight ratio: 0.5%

[0065] Water: 57.73%.

[0066] (2) Preparation of 1000g of the above-mentioned aggravated fracturing fluid

[0067] Add 577.3g of water to the waring mixer, then add 400g of sodium nitrate, start the mixer to fully dissolve it; add 5.2g of thickener hydroxypropyl guar gum under continuous stirring, swell for 30 minutes and thicken, then add sodium carbonate 1.0 g, fungicide dodecyltrimethylammonium...

Embodiment 3

[0072] (1) Fracturing fluid formula three of the present invention (density is 1.35g / cm 3 )

[0073] Weighting agent sodium nitrate weight ratio: 46.5%

[0074] Thickener hydroxypropyl guar gum weight ratio: 0.55%

[0075] Drainage aid gemini surfactant weight ratio: 1.0%,

[0076] pH regulator Na 2 CO 3 Weight ratio: 0.15%

[0077] Fungicide dodecyltrimethylammonium chloride weight ratio: 0.15%

[0078] Clay stabilizer polyquaternium weight ratio: 1.0%

[0079] Temperature stabilizer organic amine compound weight ratio: 1.0%

[0080] Water: 49.65%.

[0081] (2) Preparation of 1000g of the above-mentioned aggravated fracturing fluid

[0082] Add 496.5g of water to the waring mixer, then add 465g of sodium nitrate, start the mixer to fully dissolve it; add 5.5g of thickener hydroxypropyl guar gum under continuous stirring, swell for 30min and thicken, then add sodium carbonate 1.5g g, fungicide dodecyltrimethylammonium chloride 1.5g, clay stabilizer polyquaternium 10....