CN100513513C - Heavy cracking-fluid formula - Google Patents
Heavy cracking-fluid formula Download PDFInfo
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- CN100513513C CN100513513C CNB2005101058138A CN200510105813A CN100513513C CN 100513513 C CN100513513 C CN 100513513C CN B2005101058138 A CNB2005101058138 A CN B2005101058138A CN 200510105813 A CN200510105813 A CN 200510105813A CN 100513513 C CN100513513 C CN 100513513C
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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
The present invention relates to petroleum exploration and development oil gas well stimulation technology field, particularly relate to the fracturing liquid in the oil and water well reservoir fracturing processing technology field.
Background technology
In oil and gas exploration and exploitation, waterpower sandfrac stimulation technology at sandstone reservoir is: utilize the ground high-pressure pump, liquid is injected well with the discharge capacity that substantially exceeds the formation absorption ability, suppressed high pressure in the shaft bottom, this high pressure forms the crack after surpassing the tensile strength of near reservoir stress of the borehole wall and rock in the stratum.The fracturing liquid that continuation will have propping agent injects the crack, the crack is extended forward, and fill propping agent in the crack.After the termination of pumping, in the stratum, form the filling crack of sufficient length, width and height.Fill the crack and have very high perviousness, therefore improved the hydrocarbon zone rate of permeation.Waterpower sandfrac stimulation technology is an important technology finding hydrocarbon zone, promote Reserves Evaluation grade and raising oil gas well single well productivity.
At the sandfrac reservoir reconstruction of deep-well, ultra deep well, surpressure well, unusual high-ground stress well, wellhead pressure is higher during owing to construction, utilizes present fracturing liquid and equipment construction to carry out.Join 1 well well depth as the crow of Tarim Basin Oilfield Company and surpass 6000m, reservoir pressure coefficient is greater than 2.0, and the formation fracture fracture gradient is greater than 0.022MPa/m, and wellhead pressure will be up to 103MPa during pressing crack construction.Conventional sandfrac liquid system density is at 1.000 one 1.005g/cm
3Between.Adopt conventional fracturing liquid construction, require the fracturing unit minimum operating pressure to reach more than the 103MPa.And the highest 103MPa that can only reach of existing fracturing truck does not have the reservation operations space.Consider safety and the fracturing unit running at full capacity for a long time of well head production tree, adopt conventional fracturing liquid construction, can't finish this well pressing crack construction task.
Summary of the invention
The purpose of this invention is to provide the heavy cracking-fluid formula that uses in a kind of high-pressure oil well fracturing treatment process, increase fluid column pressure in the pit shaft, reduce the well head operation pressure, adapt to the pressure break reservoir reconstruction of deep-well, ultra deep well, surpressure well, unusual high-ground stress well, fine and close well.Overcome this class well wellhead pressure height, a pressure break difficult problem of using present construction equipment to finish.Reach the purpose of utilizing weighted fracture fluid of the present invention and existing equipment can finish the pressing crack construction of this class exceptional well smoothly.Technical scheme of the present invention is: add the weighting agent inorganic salt in fracturing liquid, form density and be up to 1.50g/m
3Weighted fracture fluid, increase fluid column pressure, reduce the purpose of well head operation pressure.This formula system adopts inorganic salt to increase the weight of, and has formed the heavy cracking-fluid formula of different densities.The weight ratio of concrete each component of heavy cracking-fluid formula is: 500 parts in water; Weighting agent 180-483 part; Viscosifying agent hydroxypropylguar gum 2-3 part; PH value conditioning agent sodium carbonate 0.8-1 part: pH value conditioning agent sodium hydroxid 0.15-0.27 part: cleanup additive 3.0-3.3 part.Described weighting agent is NaCl, KCl, NaBr, KBr.Described cleanup additive is that the high-density of DJ-02, HSC-250 weighted fracture fluid of the present invention can reach 1.50g/cm
3This weighted fracture fluid density can be at 1.25-1.50g/cm
3In the scope, adjust according to the reservoir pressure of construction well.The way of reconciling density is: in the present invention fills a prescription, increase the ratio of weighting agent or the ratio of minimizing water, improve weighted fracture fluid density; Otherwise, increase the ratio of water or the ratio of minimizing weighting agent, reduce weighted fracture fluid density.Utilize weighted fracture fluid of the present invention and existing weaponry and equipment just can finish the pressure break reservoir reconstruction of deep-well, ultra deep well, surpressure well, unusual high-ground stress well, fine and close well reservoir smoothly.Finished the oil reservoir pressing crack construction that conventional fracturing liquid can not be finished.Overcome this class well wellhead pressure height, the pressure break difficult problem that can't finish.This weighted fracture fluid has delay cross linking, low frictional resistance characteristic; Have anti-cutting performance of good heatproof and rheological property; Have low leak-off, broken glue is thorough, and is little to reservoir damage, have excellent compatibility and breaking glue solution to return row with well control fluid and can not cause characteristics such as corrosion down-hole string.Weighted fracture fluid of the present invention is successfully used 8 mouthfuls of wells.Many mouthfuls of wells such as wherein wild cloud 2, group's 6 wells have obtained geological effect preferably, for deep-well, ultra deep well, surpressure well, unusual high-ground stress well sandfrac reservoir reconstruction provide a kind of new formulation.
Embodiment
Embodiment 1
Performance to weighted fracture fluid in the laboratory is tested respectively.
Test process is as follows:
1, the test of of the fracturing fluid configuration and density: mix in the accent device at the WARING that fills 774g water, add 664g weighting agent NaBr and 60g weighting agent NaCl, after being dissolved fully, it slowly adds viscosifying agent hydroxypropylguar gum 4.5g again, after stirring 30min reaches certain viscosity, just add pH value conditioning agent sodium carbonate 1.5g and sodium hydroxid 0.25g successively, cleanup additive DJ-025.0g continues to stir 15min it is fully dissolved, and forms uniform solution and gets final product.Densometer is used in the test of density, and the density of above-mentioned weighted fracture fluid is 1.5g/cm
3The weight ratio of each material sees the following form:
| Water | Weighting agent | Viscosifying agent | Yellow soda ash | Sodium hydroxide | Cleanup additive | |
| Embodiment 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 |
2, use the fracturing liquid base fluid of above-mentioned configuration, adopt organic borate cross-linker crosslinked, crosslinked ratio 100 to 0.4, the fracturing fluid gel viscosity temperature characteristic sees the following form.
The anti-cutting performance of heatproof
| T(min) | n(mPa.S) | T(℃) |
| Initially | 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 | 115.6 |
| 60 | 164.7 | 117.4 |
| 80 | 141.8 | 119.6 |
| 100 | 131.9 | 119.4 |
| 120 | 116.3 | 120.5 |
3, the filtration property of weighted fracture fluid
Use SLTM-LAB dynamic filtration injury instrument, measured the dynamic filtration performance of above-mentioned 2 heavy cracking-fluid formula systems in the time of 100 ℃.Dynamic filtration coefficient to the standard rock core is
4, weighted fracture fluid breaking glue solution corrosive nature: use the N80 steel disc in the test,, soak steel disc with this fracturing liquid rubber-breaking liquid under 90 ℃ of conditions, carry out corrosion test with reference to the SY/T54051996 standard at 24h.Test records fracturing liquid rubber-breaking liquid: 0.034g/m
2.h.
Embodiment 2
Rig-site utilization embodiment 1
At first, according to layer position thickness, porosity and the radius of intending implementing the fracturing reform well in operation, the cumulative volume that calculates required weighted fracture fluid is 200m
3Then calculate the weight of required each component: water, 153t in the aforementioned formula ratio; Weighting agent NaBr, 127.8t; Weighting agent NaCl, 12t; The viscosifying agent hydroxypropylguar gum, 0.9t; PH value conditioning agent Na
2CO
3, 0.3t; PH value conditioning agent NaOH, 0.08t; Cleanup additive HCS-25,1t.Weighted fracture fluid density reaches 1.475g/cm
3, will calculate water gaging during the preparation weighted fracture fluid earlier and add in the dosing pond, add NaBr, NaCl, stir, respectively toward interior viscosifying agent hydroxypropylguar gum, sodium hydroxid and the cleanup additive that adds calculated amount of liquid pool.After mixing, install in the special-purpose tank car and transport to the scene, the outstanding sand of institute's dispense liquid is clamp-oned oil reservoir, finish the pressure break task with 2000 type fracturing trucks.The weight ratio of each material sees the following form:
| Water | Weighting agent | Viscosifying agent | Yellow soda ash | Sodium hydroxide | Cleanup additive | |
| Embodiment 2 (t) | 153 | NaBr127.8+NaCl， 12 | 0.9 | 0.3 | 0.08 | HCS-25，1 |
| Weight ratio | 500 | 457 | 2.94 | 0.98 | 0.26 | 3.26 |
Embodiment 3
Rig-site utilization embodiment 2
At first, the total amount of calculating required weighted fracture fluid according to layer position thickness, porosity and radiuscope that intend to implement the fracturing reform well in operation is 300m
3Then calculate the consumption of required each component: water 250t in the aforementioned formula ratio; Weighting agent KCl 90t; Viscosifying agent hydroxypropylguar gum 1.35t; PH value conditioning agent NaOH 0.12t, Na
2CO
30.45t; Cleanup additive DJ-02 1.5t.
To calculate water gaging during the preparation weighted fracture fluid earlier and add in the dosing pond, add KCl, stir.Respectively toward interior viscosifying agent hydroxypropylguar gum, sodium hydroxide and the cleanup additive that adds calculated amount of liquid pool.After mixing, install in the special-purpose tank car and transport to the scene, the outstanding sand of institute's dispense liquid is clamp-oned oil well operation reservoir with 2000 type fracturing trucks.
The weight ratio of weighted fracture fluid sees the following form
| Water | Weighting agent | Viscosifying agent | Yellow soda ash | Sodium hydroxide | Cleanup additive | |
| Embodiment 2 (t) | 250 | KCl，90 | 1.35 | 0.45 | 0.12 | DJ-02，1.5 |
| Weight ratio | 500 | 180 | 2.7 | 0.9 | 0.24 | 3.0 |
Claims (3)
1, a kind of heavy cracking-fluid formula is characterized in that: composition and weight ratio thereof are
Water 500,
Weighting agent 180～483,
Viscosifying agent hydroxypropylguar gum 2～3,
PH value conditioning agent yellow soda ash 0.8～1,
PH value conditioning agent sodium hydroxide 0.15～0.27,
Cleanup additive 3.0～3.3,
Weighted fracture fluid density is 1.25～1.50g/cm
3
2, heavy cracking-fluid formula as claimed in claim 1 is characterized in that, described weighting agent is the mixture of NaCl, KCl, NaBr, KBr or above-mentioned inorganic salt.
3, heavy cracking-fluid formula as claimed in claim 1 is characterized in that, described cleanup additive is HSC-25 or DJ-02.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101058138A CN100513513C (en) | 2005-09-29 | 2005-09-29 | Heavy cracking-fluid formula |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101058138A CN100513513C (en) | 2005-09-29 | 2005-09-29 | Heavy cracking-fluid formula |
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| CN1940009A CN1940009A (en) | 2007-04-04 |
| CN100513513C true CN100513513C (en) | 2009-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876314A (en) * | 2012-09-27 | 2013-01-16 | 中国石油化工股份有限公司 | Weighted fracturing fluid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107502314A (en) * | 2017-07-13 | 2017-12-22 | 中海油能源发展股份有限公司 | It is a kind of to aggravate salt with cleaning using completion prepared by waste liquid of drilling |
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2005
- 2005-09-29 CN CNB2005101058138A patent/CN100513513C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876314A (en) * | 2012-09-27 | 2013-01-16 | 中国石油化工股份有限公司 | Weighted fracturing fluid |
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