CN105885817A - Clean fracturing fluid gel breaker and application of fracturing fluid in low permeability-ultra-low permeability oil and gas reservoirs - Google Patents
Clean fracturing fluid gel breaker and application of fracturing fluid in low permeability-ultra-low permeability oil and gas reservoirs Download PDFInfo
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- CN105885817A CN105885817A CN201610275539.7A CN201610275539A CN105885817A CN 105885817 A CN105885817 A CN 105885817A CN 201610275539 A CN201610275539 A CN 201610275539A CN 105885817 A CN105885817 A CN 105885817A
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- fracturing fluid
- gel breaker
- clean fracturing
- gel
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
Abstract
The invention provides a clean fracturing fluid gel breaker and an application of fracturing fluid in low permeability-ultra-low permeability oil and gas reservoirs, and belongs to the field of petrochemical engineering. In order to overcome the shortcomings of existing clean fracturing fluid, the clean fracturing fluid gel breaker which is controllable in gel breakage, good in gel breaking performance and suitable for the low permeability-ultra-low permeability oil and gas reservoirs at the temperature of 20-90 DEG C and application of the clean fracturing fluid gel breaker are provided. 0.03-2.00% by mass of the clean fracturing fluid gel breaker is added relative to the total mass of fracturing fluid. The gel breaker is lauric acid. The clean fracturing fluid consists of the following ingredients in percentages by mass: 0.80-4.00% of a thickening agent, 0.50-2.00% of a cross-linking agent, 0.03-2.00% of the gel breaker, 0.02-1.00% of a regulator and the balance of fluid preparation water. The clean fracturing fluid can be used in oil and gas wells of which the formation temperature is 20-90 DEG C, the gel breaking performance is good, and a solution is clear after gel breaking, does not have residues and is not emulsified; and the gel breaking time is 60-300 min, and during fracturing construction, requirements of sand carrying of the fracturing fluid can be met.
Description
Technical field
The invention belongs to petrochemical field, particularly relate to the application in hypotonic-ultra-low penetration oil-gas reservoir of a kind of clean fracturing fluid gel breaker and fracturing fluid thereof.
Background technology
In fracturing process, making clean fracturing fluid controllably break glue, the reagent that gelled fracturing fluid can be made to break glue is referred to as gel breaker, and preferable gel breaker, at whole liquid with during taking sand, should remain preferable high viscous, once pump complete, and liquid breaks gel water at once.Gel breaker is the key component in fracturing fluid.At present on-the-spot conventional gel breaker can be summarized as following a few class: 1 peroxide, such as Ammonium persulfate., potassium peroxydisulfate etc., it uses temperature more than 50 DEG C, when using temperature less than 50 DEG C, the speed of its release free oxygen is slowed or stopped, and does not has or part plays brokenly glue effect in fracturing fluid, and it belongs to no special reactant, any reactant such as tubing, stratum substrate and the hydro carbons etc. that can and run into react, and generate and the incompatible pollutant in stratum, cause formation damage；2 enzymes, can be used as the broken glue under lower temperature, but must be maintained under low pH value when using, and enzyme just can play brokenly glue effect, harsh use condition and expensive cost and restrict its large-scale application；3 capsule breakers, are a kind of Delayed Release Breakers, it is adaptable to the broken glue of high temperature fracture liquid.
Clean fracturing fluid is a kind of non-residue fracture fluid system of rising in recent years, and at present, the broken glue mode of clean fracturing fluid is mainly a large amount of formation water or oil (hydrocarbon) class, but during actual application, there is brokenly glue difficulty, and the shortcomings such as sand, effect of increasing production difference are told by the row of returning.Chinese patent 200910208522.X, disclosed a kind of pressure break low-cost water-based clean fracturing fluid and breaking glue solution, this water-based clean fracturing fluid exist concentration relatively low time, fracturing fluid can not be made to break glue completely, during concentration height, broken glue excessive velocities, it is impossible to reach to take sand requirement.
Low molecule alcohols in the market, such as n-amyl alcohol, n-octyl alcohol etc. clean fracturing fluid had broken glue effect, but all there is dosage can not make fracturing fluid break glue completely less, dosage makes fracturing liquid rubber-breaking too fast at most, do not reach and take sand requirement, i.e. there is the defect of uncontrollable broken glue time, it is impossible to meet the requirement of on-the-spot pressing crack construction.
And clean fracturing fluid research in oil field uses conventional oxidation gel breaker Ammonium persulfate. and surfactant Sulfonates to use as gel breaker, but during by studying its broken colloidality energy, find that although the gel breaker of variable concentrations can make the viscosity of clean fracturing fluid reduce different values, but its broken glue effect is the most too fast, the viscosity of this fracturing fluid just can be made within 30min to be down to definite value.
Chinese patent 201310571931.2, although a kind of viscoelastic surfactant clean fracturing fluid gel breaker and application thereof disclose the mixture that gel breaker is lauric acid and alkylphenol polyoxyethylene, when but lauric acid uses separately as gel breaker, owing to lauric acid is insoluble in Viscoelastic Surfactant-based Fracturing Fluid, the broken glue of existence is thorough or does not has brokenly glue effect, it is thus desirable to increase other composition in gel breaker, improve brokenly colloidality energy with this.
Summary of the invention
It is an object of the invention to for drawbacks described above, it is provided that a kind of broken glue is controlled, and broken colloidality can be good, it is adaptable to temperature 20～the clean fracturing fluid of 90 DEG C and the application in hypotonic-ultra-low penetration oil-gas reservoir thereof.
The present invention provides a kind of clean fracturing fluid gel breaker, and relative to the gross mass of fracturing fluid, it is 0.03～2.00% that gel breaker adds quality, and described gel breaker is lauric acid.
The present invention also provides for the clean fracturing fluid containing above-mentioned gel breaker, the one-tenth remembered with mass fraction be grouped into:
Thickening agent
0.80～4.00%,
Cross-linking agent
0.50～2.00%,
Gel breaker
0.03～2.00%,
Regulator
0.02～1.00%,
Surplus is dosing water.
Described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Described cross-linking agent is sodium salicylate.
Described regulator is sheet alkali (sodium hydroxide).
Further, the present invention provides the application in hypotonic-ultra-low penetration oil-gas reservoir of the above-mentioned clean fracturing fluid gel breaker, as the well fracturing that formation temperature is 20～90 DEG C.
Further, the present invention provides the application in hypotonic-ultra-low penetration oil-gas reservoir of the above-mentioned clean fracturing fluid, as the well fracturing that formation temperature is 20～90 DEG C.
The specifically used method of fracturing fluid of the present invention is: be slowly added to thickening agent, cross-linking agent by mass percentage in dosing water in site of deployment, it is uniformly mixed, adding regulator regulation mixed liquor pH value is 8～10, stir, then mulling liquid it is mixed to form with fracturing propping agents, during pressing crack construction, gel breaker taper being added mulling liquid, fracturing propping agents are this area conventional reagent.
There is advantages that
The clean fracturing fluid of the present invention can be used for the Oil/gas Well in hypotonic-ultra-low penetration oil-gas reservoir between formation temperature 20～90 DEG C, and broken colloidality can be good, and solution is limpid after breaking gel, without residue, without emulsion；It is 60～300min that clean fracturing fluid of the present invention breaks the glue time, and the time is controlled, when pressing crack construction, can meet fracturing fluid and take sand requirement.
Accompanying drawing explanation
Fig. 1 is fracturing fluid viscograph at 30 DEG C of embodiment 5 variable concentrations gel breaker dosage；
Fig. 2 is fracturing fluid viscograph at 35 DEG C of embodiment 6 variable concentrations gel breaker dosage；
Fig. 3 be in embodiment 7 Ammonium persulfate. as the fracturing fluid viscosity-temperature curve of gel breaker；
Fig. 4 be in embodiment 7 sulfonate as the fracturing fluid viscosity-temperature curve of gel breaker.
Detailed description of the invention
Below by the specific embodiment be given, the present invention will be further described, but not as a limitation of the invention.
The following all embodiments of the present invention all select formation water as dosing water.
Embodiment 1
Fracturing fluid of the present invention is grouped into by the one-tenth remembered with mass fraction:
Thickening agent
0.80%,
Cross-linking agent
0.50%,
Lauric acid
0.03%,
Regulator
0.02%,
Surplus is formation water.
Described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Described cross-linking agent is sodium salicylate.
Described regulator is sheet alkali (sodium hydroxide).
When this fracturing fluid is applied to scene, formation water will be slowly added to thickening agent, cross-linking agent by mass percentage, it is uniformly mixed, adding regulator regulation mixed liquor pH value is 8-10, stir, then it is mixed to form mulling liquid with fracturing propping agents, during pressing crack construction, gel breaker taper is added mulling liquid.
Embodiment 2
Fracturing fluid of the present invention is grouped into by the one-tenth remembered with mass fraction:
Thickening agent
1.50%,
Cross-linking agent
0.80%,
Lauric acid
1.25%,
Regulator
0.03%,
Surplus is formation water.
Described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Described cross-linking agent is sodium salicylate.
Described regulator is sheet alkali (sodium hydroxide).
When this fracturing fluid is applied to scene, formation water will be slowly added to thickening agent, cross-linking agent by mass percentage, it is uniformly mixed, adding regulator regulation mixed liquor pH value is 8-10, stir, then it is mixed to form mulling liquid with fracturing propping agents, during pressing crack construction, gel breaker taper is added mulling liquid.
Embodiment 3
Fracturing fluid of the present invention is grouped into by the one-tenth remembered with mass fraction:
Thickening agent
1.50%,
Cross-linking agent
0.80%,
Lauric acid
1.10%,
Regulator
0.025%,
Surplus is formation water.
Described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Described cross-linking agent is sodium salicylate.
Described regulator is sheet alkali (sodium hydroxide).
When this fracturing fluid is applied to scene, formation water will be slowly added to thickening agent, cross-linking agent by mass percentage, it is uniformly mixed, adding regulator regulation mixed liquor pH value is 8-10, stir, then it is mixed to form mulling liquid with fracturing propping agents, during pressing crack construction, gel breaker taper is added mulling liquid.
Embodiment 4
Fracturing fluid of the present invention is grouped into by the one-tenth remembered with mass fraction:
Thickening agent
4.00%,
Cross-linking agent
2.00%,
Lauric acid
2.00%,
Regulator
1.00%,
Surplus is formation water.
Described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Described cross-linking agent is sodium salicylate.
Described regulator is sheet alkali (sodium hydroxide).
When this fracturing fluid is applied to scene, formation water will be slowly added to thickening agent, cross-linking agent by mass percentage, it is uniformly mixed, adding regulator regulation mixed liquor pH value is 8-10, stir, then it is mixed to form mulling liquid with fracturing propping agents, during pressing crack construction, gel breaker taper is added mulling liquid.
Embodiment 5
The oil-gas Layer degree of depth of Ordos Basin exploration and development oil gas field is typically 500～3500m at present, and prime stratum temperature is at 20～90 DEG C.
The present invention uses the fracturing fluid formula that embodiment 2 obtains, and under this formula, selecting gel breaker dosage is 0.50%, 1.00%, 1.50%, 2.00%, detects the viscosity of fracturing fluid, can obtain viscosity and change over curve (Fig. 1) at temperature 30 DEG C.
From figure 1 it appears that gel breaker consumption is the biggest, the broken glue time is the shortest.At temperature 30 DEG C, in the case of gel breaker dosage 2.0%, its broken glue shortest time is still above 60min；Regulator consumption is about 0.03%, and gel breaker consumption should control about 1.25%.
Embodiment 6
The oil-gas Layer degree of depth of Ordos Basin exploration and development oil gas field is typically 500～3500m at present, and prime stratum temperature is at 20～90 DEG C.
The present invention uses the fracturing fluid formula that embodiment 3 obtains, under this formula, selecting gel breaker dosage is the viscosity that the fracturing fluid of 0.50%, 0.80%, 1.00%, 1.20% detects fracturing fluid at temperature 35 DEG C, can obtain viscosity and change over curve (Fig. 2).
From figure 2 it can be seen that gel breaker consumption is the biggest, the broken glue time is the shortest.At temperature 35 DEG C, regulator consumption is about 0.025%, and gel breaker consumption should control about 1.10%.
Embodiment 7
Lauric acid in the embodiment of the present application 2 is replaced with Ammonium persulfate. and sulfonate respectively, gel breaker as clean fracturing fluid, select 25,30,35,40 DEG C in the lab as experimental temperature, subsequent process is as described in Example 2, can be obtained under different temperatures by experiment, the Ammonium persulfate. of variable concentrations and sulfonate break colloidality energy, as shown in Figure 3 and Figure 4.
From figs. 3 and 4 it can be seen that Ammonium persulfate. and sulfonate are as gel breaker, its broken glue effect is rapid, can make the viscosity drop as little as fixed value of clean fracturing fluid, owing to broken glue is too fast, sand plug can be caused maybe can not to efficiently accomplish and take sand task in 30min.
Embodiment 8
Being incompatible with formation fluid and contain certain residue after breaking gel after general fracturing liquid rubber-breaking all can cause some to injure oilfield reservoir, the application gel breaker is good with formation water compatibility after breaking gel, take after breaking glue solution and formation water mix standing 24 hours by 1:2,1:1,2:1 volume ratio respectively, find no precipitation, lamination, do residue content measurement result and display that without residue, it can be seen that the application gel breaker has good compatibility.
Above content is to combine the further description that the present invention is done by specific embodiment, it is impossible to assert the present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a clean fracturing fluid gel breaker, it is characterised in that: relative to the gross mass of fracturing fluid, it is 0.03～2.00% that gel breaker adds quality, and described gel breaker is lauric acid.
2. the clean fracturing fluid containing gel breaker described in claim 1, it is characterised in that: it is grouped into by the one-tenth remembered with mass fraction:
Thickening agent
0.80～4.00%,
Cross-linking agent
0.50～2.00%,
Gel breaker
0.03～2.00%,
Regulator
0.02～1.00%,
Surplus is dosing water.
Clean fracturing fluid the most according to claim 2, it is characterised in that: described thickening agent is hexadecyltrimethylammonium chloride or octadecyl trimethyl ammonium chloride.
Clean fracturing fluid the most according to claim 2, it is characterised in that: described cross-linking agent is sodium salicylate.
Clean fracturing fluid the most according to claim 2, it is characterised in that: described regulator is sheet alkali.
6. clean fracturing fluid gel breaker application in hypotonic-ultra-low penetration oil-gas reservoir described in a claim 1, it is characterised in that: as the well fracturing that formation temperature is 20～90 DEG C.
7. the application in hypotonic-ultra-low penetration oil-gas reservoir of the clean fracturing fluid described in a claim 2, it is characterised in that: as the well fracturing that formation temperature is 20～90 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610275539.7A CN105885817A (en) | 2016-04-29 | 2016-04-29 | Clean fracturing fluid gel breaker and application of fracturing fluid in low permeability-ultra-low permeability oil and gas reservoirs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610275539.7A CN105885817A (en) | 2016-04-29 | 2016-04-29 | Clean fracturing fluid gel breaker and application of fracturing fluid in low permeability-ultra-low permeability oil and gas reservoirs |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675544A (en) * | 2016-12-20 | 2017-05-17 | 陕西海山能源发展有限公司 | Novel clean fracturing fluid system |
| WO2019144442A1 (en) * | 2018-01-24 | 2019-08-01 | 西南石油大学 | Self-healing, low-damage and ultra-high temperature-resistant fracturing fluid |
| CN112646559A (en) * | 2019-10-10 | 2021-04-13 | 中国石油化工股份有限公司 | Sand carrying fluid with functions of improving flow resistance of thickened oil and stabilizing clay |
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| US20070032386A1 (en) * | 2002-08-26 | 2007-02-08 | Carlos Abad | Internal Breaker for Oilfield Treatments |
| CN102533242A (en) * | 2011-12-19 | 2012-07-04 | 中国石油天然气股份有限公司 | Rapid viscosity breaker for surfactant fracturing fluid |
| CN102643637A (en) * | 2012-03-22 | 2012-08-22 | 中国石油天然气股份有限公司 | Clear fracturing fluid |
| CN104629707A (en) * | 2013-11-13 | 2015-05-20 | 中国石油天然气股份有限公司 | Gel breaking agent for viscoelastic surfactant clean fracturing fluid and application of gel breaking agent |
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2016
- 2016-04-29 CN CN201610275539.7A patent/CN105885817A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070032386A1 (en) * | 2002-08-26 | 2007-02-08 | Carlos Abad | Internal Breaker for Oilfield Treatments |
| CN1439691A (en) * | 2003-01-24 | 2003-09-03 | 大庆油田有限责任公司 | Harmless fracturing fluids |
| CN102533242A (en) * | 2011-12-19 | 2012-07-04 | 中国石油天然气股份有限公司 | Rapid viscosity breaker for surfactant fracturing fluid |
| CN102643637A (en) * | 2012-03-22 | 2012-08-22 | 中国石油天然气股份有限公司 | Clear fracturing fluid |
| CN104629707A (en) * | 2013-11-13 | 2015-05-20 | 中国石油天然气股份有限公司 | Gel breaking agent for viscoelastic surfactant clean fracturing fluid and application of gel breaking agent |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675544A (en) * | 2016-12-20 | 2017-05-17 | 陕西海山能源发展有限公司 | Novel clean fracturing fluid system |
| WO2019144442A1 (en) * | 2018-01-24 | 2019-08-01 | 西南石油大学 | Self-healing, low-damage and ultra-high temperature-resistant fracturing fluid |
| US10633576B2 (en) | 2018-01-24 | 2020-04-28 | Southwest Petroleum University | Ultra-high temperature fracturing fluid |
| CN112646559A (en) * | 2019-10-10 | 2021-04-13 | 中国石油化工股份有限公司 | Sand carrying fluid with functions of improving flow resistance of thickened oil and stabilizing clay |
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Application publication date: 20160824 |
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