CN102206484B - Acidic water repellent associated matter fracturing fluid - Google Patents
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Abstract
The invention relates to acidic water repellent associated matter fracturing fluid. The fracturing fluid consists of crosslinked fluid and original fluid, wherein the crosslinked fluid comprise the following components in percentage by weight: 0.2 to 0.5 percent of acidic crosslinked agent, 0.01 to 0.035 percent of crosslinked regulator A, 0.02 to 0.3 percent of crosslinked regulator B, 0.02 to 0.2 percent of gelbreaker and the balance of water; and the original fluid comprises the following components in percentage by weight: 0.3 to 0.7 percent of FS-927 polymer, 1 to 4 percent of potassium chloride, 0.5 to 1.5 percent of MJ-1 high-temperature discharge aiding agent, 0 to 2.5 percent of JTY-100 fluid loss agent, 1 percent of PR-1 demulsifier, 0 to 0.02 percent of temperature stabilizer and the balance of water. The fracturing fluid has the advantages of high crosslinking delaying performance, temperature resistance, salt resistance and shearing resistance, high sand carrying capacity, small damages to stratum, low friction resistance, low residue amount and good expansion preventing effect, can easily break gel and flow back, and breaks through the traditional concept that retarded crosslinking polymer fracturing fluid has temperature resistance and sheering resistance which can be realized at the temperature of not more than 100 DEG C.
Description
Technical field
The present invention relates to a kind of hydrocarbon-bearing pool or strong water-sensitive formation fracturing yield increasing acidic water repellent associated matter fracturing fluid.
Background technology
At present in fracturing fluid system, mainly comprising plant gum fracturing fluid, oil base fracturing fluid, foamed fracturing fluid, Emulsified fracturing fluid and Viscoelastic Surfactant-based Fracturing Fluid etc., is plant gum fracturing fluid and use more.Of the fracturing fluid development trend is towards future development efficient, low injury.For this reason, since the nineties in 20th century, developed without water-insoluble, without the Viscoelastic Surfactant-based Fracturing Fluid of residue, but this system application of temperature is lower.External report has use temperature to reach the Viscoelastic Surfactant-based Fracturing Fluid of 130 ℃, but the use temperature of the Viscoelastic Surfactant-based Fracturing Fluid of domestic report is lower than 100 ℃.There are many advantages in plant gum fracturing fluid, but the water-insoluble of this system and residue are more, larger to the injury in stratum and crack; And crosslinked condition weakly alkaline, increase alkali content and be conducive to improve the delayed cross-linking time, easily make the clay mineral in oil reservoir that the migration expansion occurs, cause a large amount of particulate shutoff pore throats, cause permeability plugging, the injury oil reservoir.So less water-soluble polymers fracturing liquid has become the popular direction of domestic and international research to formation damage.With natural polymer, compare, characteristics such as these polymkeric substance have strong, the broken colloidality of thickening capabilities can be good, residue is few, but also there is more shortcoming in synthetic polymer hydrofracturing fluid, as heatproof not, shear stability is poor etc.Domestic more in polymer fracturing fluid research, and obtain effect preferably, but also there is certain shortcoming in this polymer fracturing fluid, as: mainly use inorganic or organometallic compound to make linking agent crosslinked under alkaline condition, heatproof, salt tolerant, anti-shear performance are poor; When water-sensitive strata is constructed, be difficult to obtain the clay stabilizer good and economic with polymer fracturing fluid system compatibility.
Summary of the invention:
The purpose of this invention is to provide a kind of acidic water repellent associated matter fracturing fluid, this fracturing liquid is applicable to the fracturing reform of the quick reservoir of alkali, strong water-sensitive reservoir, there is good delayed cross-linking performance, good heatproof, anti-salt, endurance of cutting energy, taking grittiness can be good, easily broken glue return row, to formation damage little and low frictional resistance, hang down the advantages such as residue, preventive effect of expansion are good.
Acidic water repellent associated matter fracturing fluid of the present invention is comprised of crosslinked fluid and stoste, raw materials used and the weight percent each component of this acidic water repellent associated matter fracturing fluid crosslinked fluid is, acidic crosslinking agent 0.2～0.5%, cross-linking regulator A 0.01～0.035%, cross-linking regulator B0.02～0.3%, gel breaker 0.02～0.2%, surplus is water; Raw materials used and the weight percent each component of this fracturing liquid stoste is, FS-927 multipolymer 0.3～0.7%, Repone K 1～4%, MJ-1 high temperature cleanup additive 0.5～1.5%, JTY-100 fluid loss agent 0～2.5%, PR-1 emulsion splitter 1%, temperature stabilising agent 0～0.02%, surplus is water.
Acidic crosslinking agent used is obtained by following chemical reaction by weight:
(1) 0.4～0.6 part of compound organic ligand is added in 1.0～1.5 parts of water, uniform stirring also is warmed up to 45 ℃;
(2) add 0.2～0.35 part of inorganic zirconates in solution (1), under 50 ℃～55 ℃ conditions, uniform stirring is 4～4.5 hours, makes it fully to occur chemical reaction;
(3) above-mentioned reaction gained material is cooling and within static 24 hours, make the supporting acidic crosslinking agent of using of acidic water repellent associated matter fracturing fluid.
Described FS-927 multipolymer is provided by Beijing Xitao Development Tech Co., Ltd., MJ-1 high temperature cleanup additive is provided by Xinjiang Kang grace industry petrochemical complex company limited, the JTY-100 fluid loss agent is provided by town, Kelamayi logical drilling and production technology Service Co., Ltd, the PR-1 emulsion splitter in Xinjiang too chemical industry company limited provide.
Described cross-linking regulator A is one or more in lactic acid, citric acid, optimum scheme choice lactic acid;
Cross-linking regulator B is one or more in hydrochloric acid or nitric acid, optimum scheme choice hydrochloric acid.In acidic crosslinking agent, adding cross-linking regulator A and B can adjust the acidic water repellent associated matter fracturing fluid crosslinking time is 5s～240s, thereby reaches the purpose of delayed cross-linking, and at 130 ℃, 170S
-1More than shearing 75min viscosity can also remain on 50mPaS, break through retarded crosslinking polymerization physical property fracturing liquid heatproof endurance of cutting and can not surpass the traditional concept of 100 ℃, can meet like this construction requirement of high temperature deep well.
Described temperature stabilising agent is one or more in methyl alcohol, Sulfothiorine.
Described gel breaker is one or more in Sodium Persulfate, ammonium persulfate, the optimum scheme choice Sodium Persulfate, and append a certain amount of capsule breaker that is enclosed with persulphate in construction process at the scene.
The mixture that described compound organic ligand is two or more product in amido alcohol, lactic acid, methyl ethyl diketone, glycerol;
Described inorganic zirconates is a kind of in zirconium tetrachloride, zirconium sulfate, zirconium oxychloride, the optimum scheme choice zirconium oxychloride.
By and site test results indoor to acidic water repellent associated matter fracturing fluid, show, this acidic water repellent associated matter fracturing fluid system has good delayed cross-linking performance, good heatproof, anti-salt, endurance of cutting energy, taking grittiness can be good, easily broken glue return row, to formation damage little and low frictional resistance, hang down the advantages such as residue, preventive effect of expansion are good.This acidic water repellent associated matter fracturing fluid is applicable to the fracturing reform of the quick reservoir of alkali, strong water-sensitive reservoir, and this acidic water repellent associated matter fracturing fluid is particularly suitable for the fracturing reform of the special oil reservoir of high temperature in the group cloud matter rock class of Xinjiang Oilfield In Northwestern Margin wind city simultaneously.
The accompanying drawing explanation
100 ℃ of shearing curves of Fig. 1.
113 ℃ of shearing curves of Fig. 2.
130 ℃ of shearing curves of Fig. 3.
The impact of the different HCL dosages of Fig. 4 on the acidic water repellent associated matter fracturing fluid crosslinking time.
Fig. 5 wind south 4 well construction curves.
Fig. 6 hundred spring 1 well mini-frac construction curve.
Fig. 7 hundred spring 1 well construction curves.
Fig. 8 wind south 052 well construction curve.
Embodiment:
This acidic water repellent associated matter fracturing fluid is comprised of crosslinked fluid and stoste, raw materials used and the weight percent each component of this acidic water repellent associated matter fracturing fluid crosslinked fluid is, acidic crosslinking agent 0.2～0.5%, cross-linking regulator A 0.01～0.035%, cross-linking regulator B 0.02～0.3%, gel breaker 0.02～0.2%, surplus is water;
Cross-linking regulator A is lactic acid and/or citric acid;
Cross-linking regulator B is hydrochloric acid and/or nitric acid;
Gel breaker is Sodium Persulfate and/or ammonium persulfate;
Raw materials used and the weight percent each component of this fracturing liquid stoste is, FS-927 multipolymer 0.3～0.7%, Repone K 1～4%, MJ-1 high temperature cleanup additive 0.5～1.5%, JTY-100 fluid loss agent 0～2.5%, PR-1 emulsion splitter 1%, temperature stabilising agent 0～0.02%, surplus is water;
Temperature stabilising agent is methyl alcohol and/or Sulfothiorine.
Acidic water repellent associated matter fracturing fluid heatproof endurance of cutting can be estimated
The FS-927 multipolymer is added equably in tap water respectively and is made into the base fluid that massfraction is 0.5% and 0.7%, the temperature resisting agent that adds respectively again 1% KCL, 1% PR-1 emulsion splitter, MJ-1 high temperature cleanup additive 1%, JTY-100 fluid loss agent 2%, 0.01%, after dissolving the expansion certain hour, then add respectively corresponding linking agent, measure the anti-shear ability of its heatproof after forming frozen glue, experimental result is shown in Fig. 1, Fig. 2, Fig. 3.
As seen from Figure 1 at 100 ℃, 170S
-1Shear 90min, fracturing liquid viscosity is still more than 90mPaS, as seen from Figure 2 at 113 ℃, 170S
-1Shear 120min, fracturing liquid viscosity is still more than 80mPaS, as seen from Figure 3 at 130 ℃, 170S
-1Shear 76min, fracturing liquid viscosity is still more than 50mPaS.Show that thus this acidic water repellent associated matter fracturing fluid has the anti-shear ability of heatproof preferably, can meet 130 ℃ of pressing crack constructions with interior reservoir temperature fully.Wherein, the Main Function of temperature resisting agent is the same with oxygen scavenger, can prevent the oxygen dissolved and cause the frozen glue fast degradation in base fluid, improve of the fracturing fluid anti-shear performance, improve the complexing degree of organic crosslinking agent and viscosifying agent, make the cross-linked network of formation more firmly huge, the anti-shear performance of frozen glue strengthens.
Acidic water repellent associated matter fracturing fluid retarded crosslinking performance evaluation
For than deep-well, often adopt the retarded crosslinking technology to prevent because of crosslinked higher friction pressure and the shear degradation caused fully too early, guaranteed that fracturing liquid at high temperature has preferably stability and avoids too high oil pressure in construction.It is that FS-927 multipolymer 0.5%, Repone K 1%, MJ-1 high temperature help that the raw materials used and weight percent each component of this fracturing liquid stoste is fixed in this experiment
Row's agent 1%, JTY-100 fluid loss agent 2%, PR-1 emulsion splitter 1%, temperature stabilising agent 0.01%, surplus is water.Fixing the raw materials used weight percent that reaches a component of this acidic water repellent associated matter fracturing fluid crosslinked fluid is, acidic crosslinking agent 0.3%, lactic acid 0.02%, investigate the impact of HCL dosage on the acidic water repellent associated matter fracturing fluid crosslinking time, and experimental result is shown in Fig. 4.
As seen from Figure 4: along with the increase of HCL concentration, crosslinking time extends, and the crosslinking time of acidic water repellent associated matter fracturing fluid can be adjusted by the method for regulating the HCL consumption.This be because when pH value hour, the check figure in polynuclear hydroxy bridge complex ion reduces, and complex ion is diminished, crosslinked steric hindrance becomes greatly, thereby reaches the purpose of delayed cross-linking.
Embodiment 3
The acidic water repellent associated matter fracturing fluid prop-carrying capacity is estimated
Sand grains is the main support agent of the fracture spaces that presses off, and its effect is after pressing crack construction completes, and stops the closure in crack, keeps flow conductivity preferably.Can be bad if fracturing liquid hangs grittiness, will likely in pit shaft or crack, produce sand card or sand plug during construction, thereby cause the pump pressure rising even to be constructed, will be forced to interrupt, construction is caused to serious disadvantageous effect.So, in the acid fracturing process, require fracturing liquid should there is prop-carrying capacity preferably.Of the fracturing fluid prop-carrying capacity depends mainly on sand grains meets with the size of resistance (internal friction) while moving in the fracturing liquid medium, the testing method of prop-carrying capacity: the 20-40 order is ceramic suspended in polymer fracturing fluid, measure the suspension time of haydite in polymer fracturing fluid.Experimental result shows, haydite can reach 5 hours and is suspended in polymer fracturing fluid and do not precipitate.Illustrate that this acidic water repellent associated matter fracturing fluid has prop-carrying capacity preferably, can meet scene fully and add the sand construction requirement.
The broken colloidality of acidic water repellent associated matter fracturing fluid can be estimated
In order to improve the of the fracturing fluid row of returning, reduce the injury to reservoir, require fracturing liquid to realize thoroughly broken glue fast when construction finishes, require again fluid break time and crack closure time to be complementary.According to these construction requirements, simulated field construction dosage breaks the glue experiment to fracturing fluid system, under the condition of 100 ℃, add a certain amount of Sodium Persulfate, 1.5h after fully broken glue, the sparkling and crystal-clear bright viscosity of breaking glue solution is only 2.94mPaS, and almost there is no residue in breaking glue solution.
The acidic water repellent associated matter fracturing fluid filtrate loss controllability is estimated
Press the fracturing liquid static filtration measuring method of SY/T 5107-1995 standard code, adopt high pressure high temperature filter tester, leak-off pressure reduction 3.5MPa to acidic water repellent associated matter fracturing fluid the filtration property under 90 ℃ measure, measurement result is in Table 1.
Table 1 acidic water repellent associated matter fracturing fluid filtration property
| Temperature, ℃ | Spurt loss volume, m 3/m 2 | Leakoff coefficent, m/min 0.5 | |
| Do not add the JTY-100 |
90 | 0.35*10 -3 | 6.903*10 -4 |
| Add the 2%JTY-100 |
90 | 0.96*10 -3 | 2.65*10 -4 |
In SY/T 6376-2008 fracturing liquid current techique index, stipulate: aqueous fracturing fluid initial filter<5.0*10-2m3/m2, leakoff coefficent<1.0*10-3m/min0.5.As can be seen from Table 2, this acidic water repellent associated matter fracturing fluid filtration property meets this regulation fully, this acidic water repellent associated matter fracturing fluid leakoff coefficent is all less, illustrate that this acidic water repellent associated matter fracturing fluid is less to the filter loss on stratum, but spurt loss volume is larger, this is because this acidic water repellent associated matter fracturing fluid system residue is low, can not effectively form at first the cause of filter cake.In order more effectively to reduce the leak-off of fracturing liquid to stratum, this paper has added 2% oil soluble fluid loss additive at acidic water repellent associated matter fracturing fluid.
Acidic water repellent associated matter fracturing fluid is prevented swollen performance evaluation
Adopt the rock core dilatometer to test respectively the expansion height of cored interval 4724m～4734m hundred spring 1 well rock core powder and cored interval 4258.18m～4260.66m wind south 4 well rock core powder and different fluid, experimental result in Table 2, table 3.
Table 2 hundred spring 1 well rock core powder expand and test
| Sequence number | Reagent name | Expansion height (mm) |
| 1 | Clear water | 0.47 |
| 2 | Kerosene | 0.02 |
| 3 | 2％KCL | 0.39 |
| 4 | 6％KCL | 0.32 |
| 5 | Breaking glue solution containing 2%KCL | 0.38 |
| 6 | Breaking glue solution containing 4%KCL | 0.33 |
Table 3 wind south 4 well rock core powder expand and test
| Sequence number | Reagent name | Expansion height (mm) |
| 1 | Clear water | 0.13 |
| 2 | Kerosene | 0.01 |
| 3 | 2％KCL | 0.11 |
| 4 | 4％KCL | 0.10 |
| 5 | 6％KCL | 0.10 |
| 6 | Breaking glue solution containing 2%KCL | 0.07 |
From table 2, table 3, adding of the low pH value of acidic water repellent associated matter fracturing fluid and expansion-resisting agent KCL makes system have good anti-clayswelling performance.This is that excessive H+ can strengthen the molecular force of each interlayer by the displacement of the metal ion in clay, plays the effect of clay stabilization because sour environment can suppress to cause because of the electronegativity of surface of clay the migration of expanding effectively.In addition, inorganic zirconium compound itself is exactly a kind of good clay stabilizer, in this of the fracturing fluid breaking glue solution, contains certain zirconium ion, and the effect of clay stabilization has also been played in the existence of zirconium ion.
The acidic water repellent associated matter fracturing fluid Evaluation of Corrosion Resistance
Because this system fracturing liquid itself becomes slightly acidic, likely oil pipe is had to certain corrodibility in pressure break and in returning the row's of group process, regulation with reference to SY/T 5405-1996 acidifying by inhibiter method for testing performance and evaluation index, the breaking glue solution of this acidic water repellent associated matter fracturing fluid is reacted to 4h under 90 ℃ of conditions and has done the normal pressure static corrosion test, through this breaking glue solution of measuring in the situation that be 4.54g/m without inhibiter averaged static corrosion speed
2H, corrosion mitigating effect reaches country-level standard, and (primary standard is 3～5g/m
2H).Can meet on-the-spot pressing crack construction requirement fully.
The rig-site utilization situation
Wind Nan4Jing is Xinjiang Oilfield Company emphasis preparatory reconnaissance borehole, and the measure objective interval is: P
1f
3: 4254.0-4268.0m, formation temperature is 99.6 ℃; Hundred spring 1 wells are stock company's emphasis preparatory reconnaissance borehole, and the measure objective interval is: P
1f
1: 4724.0-4734.0m, formation temperature is 109.6 ℃.This In Northwestern Margin wind city group reservoir Alkaline minerals content is high, formation water salinity is high, and contain a large amount of boron ions and zirconium ion in local water, occur returning the problem of glue after pressure break, and conventional viscoelastic surfactant fracturing liquid and polymer fracturing fluid heatproof do not reach construction requirement.The current scene of this fracturing fluid system successfully uses 4 wells, be constructed into power 100%, after pressure break, broken glue is good, without a bite well, the glue phenomenon appears returning, all obtain good effect, this system is of the fracturing fluid to be succeeded in developing, and has broken through retarded crosslinking polymerization physical property fracturing liquid heatproof endurance of cutting and can not surpass the traditional concept of 100 ℃.
Wind Nan4Jing implements pressure break on August 6th, 2010, and construction curve is shown in Fig. 5.In construction, accumulation adds haydite 32m
3, enter well acidic water repellent associated matter fracturing fluid 357m
3, average sand is than 17%, operational discharge capacity 3.7-4.0m
3/ min, in construction, oil pressure ratio is more steady, substantially maintains the 53Mpa left and right.End 9:30 on August 10th, 2010, this well accumulation discharge opeing 124m
3, liquid effluent is alkalescence, and returning discharge opeing viscosity is only 2.52mPaS, without frozen glue and yellow particle shape material, occurs, and this well is pressed front without output, is interpreted as dry layer, day produce oil 1.62m after pressing
3, reach exploration formation testing purpose.
On August 17th, 2010 is to hundred spring 1 well P
1f
1: 4724.0-4734.0m implements mini-frac, and construction curve is shown in Fig. 6.Rate step-down test adopts 2% KCL solution, is just squeezing 2% KCL liquid 24.3m
3, pump pressure 57-75-41MPa, discharge capacity 0.5-2.1m
3/ min, sleeve pipe is beaten equilibrium pressure 25-30MPa.30min falls in 15:08-15:31 termination of pumping pressure measurement.Fracturing liquid is proofreaied and correct test and is always used acidic water repellent associated matter fracturing fluid 97.7m
3(stoste 90.3m
3, crosslinked fluid 7.4m
3).Spearhead 56.4m
3, sand-carrying agent 24m
3, add density high-strength haydite 4.0m in particle diameter 20/40 order Yangquan Shanxi
3, sand proportion 16.67%, displacing liquid 17.3m
3(replacing not complete), discharge capacity 3.0-4.0m
3/ min, pump pressure 68-90MPa, parting pressure: 89MPa.Sleeve pipe equilibrium pressure 27-32MPa.The diffusion of 16:12-19:00 shut-in pressure.Oil pressure 43-46MPa, casing pressure 35MPa.Liquid effluent is alkalescence, and returning discharge opeing viscosity is only 4.34mPaS, day produce oil 1.65m after pressing occurs without frozen glue and yellow particle shape material
3, reach the mini-frac purpose, for extensive sandfrac for the second time provides technical support.
Hundred spring 1 wells are implemented pressure break for the second time on September 4th, 2010, and construction curve is shown in Fig. 7.In construction, accumulation adds haydite 64m
3, enter well acidic water repellent associated matter fracturing fluid 600m
3, average sand is than 19.8%, operational discharge capacity 3.7-5.0m
3/ min, in construction, oil pressure ratio is more steady, substantially maintains 68Mpa-82Mpa.End on October 5th, 2010, liquid 470.91m is moved back in this well accumulation
3, liquid effluent is alkalescence, day produce oil 3.22m occurs without frozen glue and yellow particle shape material
3.
Wind Nan052Jing implements pressure break, zone of interest P on October 26th, 2010
2X:2351.0-23.58m, 63.6 ℃ of zone of interest well temperature, construction curve is shown in Fig. 8.In construction, accumulation adds quartz sand 19m
3, enter well acidic water repellent associated matter fracturing fluid 184.6m
3, average sand is than 16.67%, operational discharge capacity 3.0m
3/ min, in construction, oil pressure and casing pressure are more steady, and pump pressure maintains 32Mpa-38Mpa substantially, replaces 7.6m
3.Return discharge opeing for alkaline, broken glue is good, and returning discharge opeing viscosity is only 3.48mPaS, without frozen glue and yellow particle shape material, occurs, this well is pressed front without output, day produce oil 1.96m after pressing
3, reach exploration formation testing purpose.
Claims (2)
1. an acidic water repellent associated matter fracturing fluid, it is characterized in that: this acidic water repellent associated matter fracturing fluid is comprised of crosslinked fluid and stoste, raw materials used and the weight percent each component of this acidic water repellent associated matter fracturing fluid crosslinked fluid is, acidic crosslinking agent 0.2～0.5%, cross-linking regulator A 0.01～0.035%, cross-linking regulator B 0.02～0.3%, gel breaker 0.02～0.2%, surplus is water;
Cross-linking regulator A is lactic acid and/or citric acid;
Cross-linking regulator B is hydrochloric acid and/or nitric acid;
Gel breaker is Sodium Persulfate and/or ammonium persulphate;
Raw materials used and the weight percent each component of this fracturing liquid stoste is, FS-927 multipolymer 0.3～0.7%, Repone K 1～4%, MJ-1 high temperature cleanup additive 0.5～1.5%, JTY-100 fluid loss agent 0～2.5%, PR-1 emulsion splitter 1%, temperature stabilising agent 0～0.02%, surplus is water;
Temperature stabilising agent is methyl alcohol and/or Sulfothiorine.
2. acidic water repellent associated matter fracturing fluid according to claim 1 is characterized in that:
Acidic crosslinking agent is obtained by following chemical reaction:
(1) the compound organic ligand of 0.4～0.6 weight part is added in 1.0～1.5 weight parts waters, uniform stirring also is warmed up to 45 ℃;
(2) add the inorganic zirconates of 0.2～0.35 weight part in solution (1), under 50 ℃～55 ℃ conditions, uniform stirring is 4～4.5 hours, makes it fully to occur chemical reaction;
(3) above-mentioned reaction gained material is cooling and within static 24 hours, make the supporting acidic crosslinking agent of using of a kind of acidic water repellent associated matter fracturing fluid;
Compound organic ligand is two or more the mixture in amido alcohol, lactic acid, methyl ethyl diketone, glycerol;
Inorganic zirconates is a kind of in zirconium tetrachloride, zirconium sulfate, zirconium oxychloride.
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| CN106433601A (en) * | 2016-09-05 | 2017-02-22 | 中国石油天然气集团公司 | Crosslinking agent for sea water-based fracturing fluid as well as preparation method and application of crosslinking agent |
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| CN102206484A (en) | 2011-10-05 |
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