CN115822539B - Supercritical carbon dioxide jet composite foam sand-carrying fracturing method - Google Patents
Supercritical carbon dioxide jet composite foam sand-carrying fracturing method Download PDFInfo
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- CN115822539B CN115822539B CN202211474818.8A CN202211474818A CN115822539B CN 115822539 B CN115822539 B CN 115822539B CN 202211474818 A CN202211474818 A CN 202211474818A CN 115822539 B CN115822539 B CN 115822539B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 324
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 162
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 162
- 239000006260 foam Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 62
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 55
- 239000004576 sand Substances 0.000 claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 238000010276 construction Methods 0.000 claims abstract description 29
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 60
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 53
- 238000005086 pumping Methods 0.000 claims description 31
- 238000005507 spraying Methods 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 23
- 238000005187 foaming Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000004927 clay Substances 0.000 claims description 10
- 239000004035 construction material Substances 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 10
- 239000004064 cosurfactant Substances 0.000 claims description 10
- 239000004088 foaming agent Substances 0.000 claims description 10
- 239000003112 inhibitor Substances 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- -1 sodium fatty alcohol Chemical class 0.000 claims description 4
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 claims description 3
- ZFAKTZXUUNBLEB-UHFFFAOYSA-N dicyclohexylazanium;nitrite Chemical compound [O-]N=O.C1CCCCC1[NH2+]C1CCCCC1 ZFAKTZXUUNBLEB-UHFFFAOYSA-N 0.000 claims description 3
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- HLERILKGMXJNBU-UHFFFAOYSA-N norvaline betaine Chemical compound CCCC(C([O-])=O)[N+](C)(C)C HLERILKGMXJNBU-UHFFFAOYSA-N 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 3
- 239000004299 sodium benzoate Substances 0.000 claims description 3
- 235000010234 sodium benzoate Nutrition 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 claims description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 2
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 239000000693 micelle Substances 0.000 claims 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims 1
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- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a supercritical carbon dioxide jet composite foam sand-carrying fracturing method, and belongs to the field of hydraulic fracturing in petroleum exploitation. The invention combines the supercritical carbon dioxide injection fracturing and foam fracturing technologies, firstly, the supercritical carbon dioxide has low viscosity and strong diffusion capacity, and a more complex fracture network can be formed by adopting the supercritical carbon dioxide injection fracturing reservoir; secondly, the supercritical carbon dioxide foam is formed by impacting the sand-carrying fluid through high-flow-rate supercritical carbon dioxide, and the foam is utilized to carry propping agent into the deep part of the crack, so that the problems of high friction resistance and difficult sand carrying of the supercritical carbon dioxide in the traditional foam fracturing construction are solved; in addition, the fracturing material does not contain solid-phase substances and high-molecular substances, so that the damage to the reservoir is low. The invention overcomes the defects of strong seam making capability, good sand carrying property, low damage to the reservoir and incapability of achieving the same in the traditional fracturing fluid, and is particularly suitable for the fracturing yield increasing transformation of the low-permeability reservoir.
Description
Technical Field
The invention belongs to the field of hydraulic fracturing in petroleum exploitation, and particularly relates to a supercritical carbon dioxide jet composite foam sand-carrying fracturing method.
Background
In recent years, along with the continuous deep development of world oil and gas exploration, unconventional energy sources such as shale gas, coal bed gas, compact oil, compact gas and the like have become energy strategic targets in the 21 st century, but most unconventional oil and gas reservoirs have low permeability and great difficulty in obtaining industrial oil and gas flows, and in order to obtain unconventional oil and gas resources with economic value, fracturing modification is needed for the unconventional reservoirs. At present, hydraulic fracturing is widely applied to the production increasing operation of unconventional oil and gas reservoirs, but the permeability of the unconventional reservoirs is generally lower than 1mD, and although the conventional hydraulic fracturing can improve a seepage channel, the conventional water-based fracturing fluid contains a large amount of polymers which are adsorbed on the reservoirs after contacting the reservoirs, so that irreversible damage is caused to the reservoirs; in addition, a large amount of free water enters the reservoir, causing the reservoir clay minerals to hydrate and swell, resulting in a further decrease in the reservoir permeability. Supercritical carbon dioxide injection fracturing is a novel low-damage fracturing technology, wherein supercritical carbon dioxide is used as fracturing fluid, a supercritical carbon dioxide injection fracturing tool is utilized to form high pressure at a perforation position, and when the pressure is higher than the formation fracture pressure, a large number of cracks are generated in a reservoir. Compared with the conventional water-based fracturing fluid, the supercritical carbon dioxide does not cause damage to the reservoir; in addition, the supercritical carbon dioxide has the characteristics of high diffusivity and low viscosity, and the high diffusivity enables the supercritical carbon dioxide to enter pores more easily to form more complex cracks; the low viscosity of the oil pump can obviously reduce the flow assistance in the continuous oil pipe, thereby ensuring that the downhole injection equipment obtains enough hydraulic pressure.
As a fracturing fluid, one of the main functions of supercritical carbon dioxide is to transport propping agents deep into the fracture, preventing the fracture from closing. However, supercritical carbon dioxide has low viscosity and poor sand carrying effect, and large-scale sedimentation usually occurs in near-wellbore zones, so that the supercritical carbon dioxide cannot play a role in supporting cracks. The prior method for solving the problem is to add polymers into supercritical carbon dioxide, but the polymers have the problems of large dosage, high injury to stratum and the like. At present, a fracturing method with strong seam making capability, good sand carrying performance and low damage to a reservoir is not available.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and combines the supercritical carbon dioxide injection fracturing technology and the foam fracturing technology to form the supercritical carbon dioxide injection composite foam sand carrying fracturing method. The method has the characteristics of strong seam making capability, good sand carrying performance and small damage to the reservoir, and overcomes the defect that the traditional fracturing fluid cannot achieve the seam making capability, sand carrying performance and low damage.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
A supercritical carbon dioxide jet composite foam sand carrying fracturing method comprises the following steps:
step a, preparing construction materials and construction tools in advance according to construction requirements, wherein the construction materials comprise liquid carbon dioxide, foaming base liquid, propping agent and displacement liquid; the construction tool comprises a supercritical carbon dioxide jet fracturing tool and a coiled tubing;
Step b, using a continuous oil pipe to lower a supercritical carbon dioxide injection fracturing tool to a perforation, injecting pure liquid carbon dioxide into the continuous oil pipe, wherein the injection displacement is 6.0-12.0m 3/min; the temperature and the pressure of the liquid carbon dioxide in the continuous oil pipe are gradually increased, and finally the liquid carbon dioxide becomes supercritical carbon dioxide; the supercritical carbon dioxide is sprayed to the fracturing reservoir through a nozzle of a supercritical carbon dioxide spraying fracturing tool to form an artificial crack, wherein in the spraying process, the spraying pressure is 40-90MPa, and the spraying speed is more than 100m/s;
and c, mixing the foaming base liquid and the propping agent in a sand mixing tank to form sand-carrying liquid, wherein the sand-carrying liquid-sand ratio is 20-40%.
Step d, after the construction curve on the fracturing pump truck is obviously reduced, injecting liquid carbon dioxide into the coiled tubing by a displacement pump of 3.0-6.0m 3/min, and simultaneously injecting sand-carrying fluid into the oil casing annulus by a displacement pump of 6.0-10.0m 3/min, wherein the injection pressure of the supercritical carbon dioxide is 20-40MPa, and the injection speed is 30-60m/s; at the perforation position, the supercritical carbon dioxide with high flow rate impacts the sand-carrying fluid to form supercritical carbon dioxide foam, the foam sand ratio is 10-30%, and the supercritical carbon dioxide foam carries propping agent to enter the artificial crack under the action of annular pressure and jet pressure to prevent the artificial crack from closing;
And e, stopping pumping the sand-carrying fluid when the sand-carrying fluid consumption reaches the design consumption, pumping displacement fluid into the oil sleeve annulus, displacing all the sand-carrying fluid in the oil sleeve annulus into the artificial cracks, stopping pumping liquid carbon dioxide after displacement, and closing the supercritical carbon dioxide injection fracturing tool to finish fracturing transformation.
Preferably, the sand-carrying fluid is a mixed fluid of foaming base fluid and propping agent.
Preferably, the foaming base solution is a mixed aqueous solution of 1-10wt% of a multifunctional agent, 0.1-1wt% of a foaming agent, 0.08-0.2wt% of a cosurfactant, 0.5-3.5wt% of a corrosion inhibitor, 0.5-2.5wt% of a clay stabilizer and 0.5-5wt% of a viscosity regulator.
Preferably, the multifunctional agent is one or a mixture of erucic acid amide propyl hydroxysulfobetaine and erucic acid amide propyl betaine, the multifunctional agent can not only improve the viscosity of sand-carrying fluid to prevent the proppant from settling in an oil casing annulus, but also improve the stability of foam, and is favorable for carrying the proppant to the deep part of an artificial crack by supercritical carbon dioxide foam.
Preferably, the foaming agent is at least one of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate and sodium alpha-alkenyl sulfonate.
Preferably, the cosurfactant is at least one of methanol, ethanol, propanol and butanediol.
Preferably, the corrosion inhibitor is at least one of imidazoline, dicyclohexylamine nitrite, urotropine and sodium benzoate.
Preferably, the clay stabilizer is potassium chloride.
Preferably, the viscosity regulator is one of sodium chloride, calcium chloride and magnesium chloride.
Preferably, the propping agent is a low-density ceramsite propping agent or a quartz sand propping agent, and the particle size is one or a combination of more than one of 40-70 meshes or 70-140 meshes.
The invention adopts the technical scheme and has the following advantages:
(1) The invention provides a supercritical carbon dioxide injection composite foam sand-carrying fracturing method, which adopts a continuous oil pipe to inject supercritical carbon dioxide to break rock and make a seam; and then injecting a foam base solution mixed with propping agent into the oil sleeve annulus, forming supercritical carbon dioxide foam capable of carrying the propping agent at the perforation under the impact of supercritical carbon dioxide, further extending a crack by utilizing the strong sand carrying capacity of the supercritical carbon dioxide foam, carrying the propping agent into the deep part of the crack, and overcoming the problem of difficult sand carrying of the supercritical carbon dioxide.
(2) For conventional foam sand carrying, a propping agent and foaming base liquid are required to be mixed and stirred on the ground to form foam, and then the foam is injected into a reservoir through a shaft, so that the construction friction is high in the process, a large amount of pumping equipment is required, and a large amount of construction time is consumed;
(3) According to the invention, liquid carbon dioxide is injected into the coiled tubing, sand-carrying fluid is injected into the annular space of the oil sleeve, and the pump is not stopped in the construction process, so that the construction process is simplified;
(4) The supercritical carbon dioxide fluid has very low viscosity, high diffusion characteristic, small flow resistance in the coiled tubing and low pumping pressure, and meanwhile, in a hypotonic reservoir, the supercritical carbon dioxide can enter micro-pores and micro-cracks which cannot be entered by conventional water-based fracturing fluid, so that more and more complex cracks are generated in the reservoir, the oil drainage area is increased, and the single well yield and recovery ratio are improved;
(5) According to the supercritical carbon dioxide jet composite foam sand-carrying fracturing method provided by the invention, the used fracturing fluid material does not contain solid phase particles or macromolecular substances, and can not cause solid phase blockage, so that the fracturing fluid material is particularly suitable for a hypotonic reservoir;
(6) A large amount of carbon dioxide enters the reservoir, provides energy for the reservoir, and is beneficial to the full flowback of reservoir liquid;
(7) The supercritical carbon dioxide has strong solvation capability, can dissolve heavy oil components and other organic matters in near-wellbore areas, and reduces the oil gas flow resistance in the near-wellbore areas.
Drawings
FIG. 1 is a construction schematic diagram of a supercritical carbon dioxide injection composite foam sand carrying fracturing method of the invention.
Wherein: 1-coiled tubing, 2-supercritical carbon dioxide injection fracturing tools, 3-perforating sites, 4-wellhead, 5-reservoir, 6-oil casing annulus, 7-nozzle, 8-artificial fracture and 9-casing.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the invention provides a supercritical carbon dioxide injection composite foam sand-carrying fracturing method, which uses a continuous oil pipe 1 to lower a supercritical carbon dioxide fracturing injection tool 2 to a perforation 3, and the supercritical carbon dioxide injection fracturing reforms a reservoir to form an artificial crack 8; and (3) pumping sand-carrying fluid into the oil sleeve annulus 6 from the wellhead 4, pumping liquid carbon dioxide into the coiled tubing 1, and impacting the sand-carrying fluid by utilizing high-flow-rate supercritical carbon dioxide sprayed from the supercritical carbon dioxide spraying fracturing tool 2 to form supercritical carbon dioxide foam, wherein the supercritical carbon dioxide foam carries propping agent to enter the artificial crack 8, so that the artificial crack is prevented from being closed, and reservoir fracturing transformation is completed.
The invention provides a supercritical carbon dioxide injection composite foam sand-carrying fracturing method, which combines supercritical carbon dioxide injection fracturing and foam fracturing technologies, adopts supercritical carbon dioxide injection to break rock and make a seam, forms supercritical carbon dioxide foam mixed with propping agent by impacting sand-carrying fluid, utilizes the supercritical carbon dioxide foam to carry propping agent into the deep part of the seam, and overcomes the problem of difficult sand carrying of supercritical carbon dioxide; meanwhile, the fracturing material used in the invention does not contain solid phase substances and high polymer substances, and cannot cause damage to a reservoir; overcomes the defect that the traditional fracturing fluid cannot achieve the functions of seam making capability, sand carrying property and low injury.
Example 1
A supercritical carbon dioxide jet composite foam sand carrying fracturing method comprises the following specific implementation steps:
Step a, completing construction preparation according to construction requirements: preparing a construction tool comprising a coiled tubing 1 and a supercritical carbon dioxide injection fracturing tool 2; preparing a fracturing construction material, wherein the fracturing construction material comprises liquid carbon dioxide, foaming base liquid, propping agent and displacement liquid;
In this embodiment, the foaming base liquid includes: 2.0wt% of a multifunctional agent, 0.2wt% of a foaming agent, 0.1wt% of a cosurfactant, 0.6wt% of a corrosion inhibitor, 1.5wt% of a clay stabilizer, 3.0wt% of a viscosity modifier;
preferably, the multifunctional agent is erucamide propyl hydroxysulfobetaine;
preferably, the foaming agent is sodium fatty alcohol polyoxyethylene ether sulfate;
preferably, the cosurfactant is methanol;
preferably, the corrosion inhibitor is imidazoline;
Preferably, the clay stabilizer is potassium chloride;
Preferably, the viscosity modifier is calcium chloride;
Preferably, the propping agent is a low-density ceramsite propping agent, and the particle size of the propping agent is 70-140 meshes.
Step b, spraying the continuous oil pipe 1 and the supercritical carbon dioxide to the fracturing tool 2, and connecting the continuous oil pipe and the supercritical carbon dioxide in a sealing way; the supercritical carbon dioxide jet fracturing tool 2 is lowered to the perforation position 3 through the wellhead 4 by using the continuous oil pipe 1, liquid carbon dioxide is pumped into the continuous oil pipe 1, and the pumping discharge capacity is 12.0m 3/min. In the process of flowing to the stratum, the temperature and the pressure of the pumped liquid carbon dioxide are gradually increased, when the temperature is higher than 31.1 ℃ and the pressure is higher than 7.38MPa, the carbon dioxide becomes a supercritical state, and the supercritical carbon dioxide sprays a fracturing reservoir through a nozzle 7 of a supercritical carbon dioxide spraying fracturing tool to form an artificial crack, wherein in the spraying process, the spraying pressure is 90MPa, and the spraying speed is 160m/s.
And c, mixing the foaming base liquid with the low-density ceramsite propping agent through a ground sand mixing tank to form sand-carrying liquid, wherein the sand ratio of the sand-carrying liquid is 35%.
Step d, when the construction curve on the fracturing pump truck is obviously reduced, reducing the pumping discharge capacity of liquid carbon dioxide, and simultaneously injecting sand-carrying fluid into the oil sleeve annulus 6 by using a displacement pump of 8m 3/min; at the perforation position 3, high-flow-rate supercritical carbon dioxide impacts sand-carrying fluid to form supercritical carbon dioxide foam, and under the action of annular pressure and injection pressure, the supercritical carbon dioxide foam carries propping agent to enter the artificial crack 8 to prevent the artificial crack from closing;
Specifically, in order to form supercritical carbon dioxide foam at a perforation position by pumping liquid carbon dioxide, the pumping discharge capacity is not required to be too high, when the discharge capacity is 4.0m 3/min, the injection pressure reaches 28MPa, the injection speed reaches 40m/s, the supercritical carbon dioxide foam can be effectively formed by impacting sand-carrying liquid, and the formed foam sand ratio is 25%;
specifically, when the high-flow-rate supercritical carbon dioxide impacts the sand-carrying fluid to form foam, the sand ratio can be reduced by mixing the supercritical carbon dioxide with the water phase, so that the sand-carrying fluid with high sand ratio needs to be designed when the sand ratio is designed, and the foam sand ratio can still meet the construction requirement after the supercritical carbon dioxide foam is formed.
Step e, stopping pumping the sand-carrying fluid when the sand-carrying fluid consumption reaches the design consumption, pumping displacement fluid into the oil sleeve annulus 6, and displacing all the sand-carrying fluid in the oil sleeve ring into the artificial cracks to prevent sand blockage; after the displacement is finished, the pumping of the liquid carbon dioxide is stopped, the supercritical carbon dioxide jet fracturing tool 2 is closed, and the fracturing transformation is completed.
Example 2
A supercritical carbon dioxide jet composite foam sand carrying fracturing method comprises the following specific implementation steps:
Step a, completing construction preparation according to construction requirements: preparing a construction tool comprising a coiled tubing 1 and a supercritical carbon dioxide injection fracturing tool 2; preparing a fracturing construction material, wherein the fracturing construction material comprises liquid carbon dioxide, foaming base liquid, propping agent and displacement liquid;
in this embodiment, the foaming base liquid pack is: 4.0wt% of a multifunctional agent, 0.15wt% of a foaming agent, 0.12wt% of a cosurfactant, 2.5wt% of a corrosion inhibitor, 2.0wt% of a clay stabilizer, 3.0wt% of a viscosity modifier;
preferably, the multifunctional agent is erucamide propyl hydroxysulfobetaine;
Preferably, the foaming agent is alpha-sodium alkenyl sulfonate;
Preferably, the cosurfactant is ethanol;
preferably, the corrosion inhibitor is sodium benzoate;
Preferably, the clay stabilizer is potassium chloride;
Preferably, the viscosity modifier is magnesium chloride;
preferably, the propping agent is quartz sand propping agent, and the particle size of the propping agent is 70-140 meshes.
Step b, spraying the continuous oil pipe 1 and the supercritical carbon dioxide to the fracturing tool 2, and connecting the continuous oil pipe and the supercritical carbon dioxide in a sealing way; the supercritical carbon dioxide jet fracturing tool 2 is lowered to a perforation position through a wellhead 4 by using the continuous oil pipe 1, liquid carbon dioxide is pumped into the continuous oil pipe 1, and the pumping discharge capacity is 10.0m 3/min. In the process of flowing into the stratum, the temperature and the pressure of the liquid carbon dioxide pumped from the wellhead 4 are gradually increased, when the temperature is higher than 31.1 ℃ and the pressure is higher than 7.38MPa, the carbon dioxide becomes a supercritical state, the supercritical carbon dioxide sprays a fracturing reservoir through a nozzle 7 of a supercritical carbon dioxide spraying fracturing tool to form an artificial crack, in the spraying process, the spraying pressure is 75MPa, and the spraying speed is 140m/s. .
And c, mixing the foaming base liquid with the quartz sand propping agent through a ground sand mixing tank to form sand carrying liquid, wherein the sand ratio of the sand carrying liquid is 30%.
Step d, when the construction curve on the fracturing pump truck is obviously reduced, reducing the pumping discharge capacity of liquid carbon dioxide, and simultaneously injecting sand-carrying fluid into the oil sleeve annulus 6 by using a displacement pump of 7.5m 3/min; at the perforation position 3, high-flow-rate supercritical carbon dioxide impacts sand-carrying fluid to form supercritical carbon dioxide foam, and under the action of annular pressure and injection pressure, the supercritical carbon dioxide foam carries propping agent to enter the artificial crack 8 to prevent the artificial crack from closing;
Specifically, in the process, in order to form supercritical carbon dioxide foam at a perforation position, the pumping discharge capacity is not required to be too high, when the discharge capacity is 5.0m 3/min, the injection pressure reaches 36MPa, the injection speed reaches 50m/s, the sand-carrying fluid can be effectively impacted to form the supercritical carbon dioxide foam, and the formed foam sand ratio is 20%;
specifically, when the high-flow-rate supercritical carbon dioxide impacts the sand-carrying fluid to form foam, the sand ratio can be reduced by mixing the supercritical carbon dioxide with the water phase, so that the sand-carrying fluid with high sand ratio needs to be designed when the sand ratio is designed, and the foam sand ratio can still meet the construction requirement after the supercritical carbon dioxide foam is formed.
Step e, stopping pumping the sand-carrying fluid when the sand-carrying fluid consumption reaches the design consumption, pumping displacement fluid into the oil sleeve annulus 6, and displacing all the sand-carrying fluid in the oil sleeve ring into the artificial cracks to prevent sand blockage; after the displacement is finished, the pumping of the liquid carbon dioxide is stopped, the supercritical carbon dioxide jet fracturing tool 2 is closed, and the fracturing transformation is completed.
Example 3
A supercritical carbon dioxide jet composite foam sand carrying fracturing method comprises the following specific implementation steps:
Step a, completing construction preparation according to construction requirements: preparing a construction tool comprising a coiled tubing 1 and a supercritical carbon dioxide injection fracturing tool 2; preparing a fracturing construction material, wherein the fracturing construction material comprises liquid carbon dioxide, foaming base liquid, propping agent and displacement liquid;
In this embodiment, the foaming base liquid pack is: 4.5wt% of a multifunctional agent, 0.1wt% of a foaming agent, 0.12wt% of a cosurfactant, 2.6wt% of a corrosion inhibitor, 2.3wt% of a clay stabilizer, 3.5wt% of a viscosity modifier;
Preferably, the multifunctional agent is erucamide propyl betaine;
Preferably, the foaming agent is sodium dodecyl benzene sulfonate and sodium dodecyl sulfate;
Preferably, the cosurfactant is butanediol;
preferably, the corrosion inhibitor is dicyclohexylamine nitrite;
Preferably, the clay stabilizer is potassium chloride;
Preferably, the viscosity modifier is calcium chloride or magnesium chloride;
Preferably, the propping agent is a low-density ceramsite propping agent, and the particle size of the propping agent is 70-140 meshes.
Step b, spraying the continuous oil pipe 1 and the supercritical carbon dioxide to the fracturing tool 2, and connecting the continuous oil pipe and the supercritical carbon dioxide in a sealing way; the supercritical carbon dioxide jet fracturing tool 2 is lowered to a perforation position through a wellhead 4 by using the continuous oil pipe 1, liquid carbon dioxide is pumped into the continuous oil pipe 1, and the pumping discharge capacity is 8.0m 3/min. In the process of flowing into the stratum, the temperature and the pressure of the liquid carbon dioxide pumped from the wellhead 4 are gradually increased, when the temperature is higher than 31.1 ℃ and the pressure is higher than 7.38MPa, the carbon dioxide becomes a supercritical state, the supercritical carbon dioxide sprays a fracturing reservoir through a nozzle 7 of a supercritical carbon dioxide spraying fracturing tool to form an artificial crack, in the spraying process, the spraying pressure is 65MPa, and the spraying speed is 120m/s.
And c, mixing the foaming base liquid with the low-density ceramsite propping agent through a ground sand mixing tank to form sand-carrying liquid, wherein the sand ratio of the sand-carrying liquid is 25%.
Step d, when the construction curve on the fracturing pump truck is obviously reduced, reducing the pumping discharge capacity of liquid carbon dioxide, and simultaneously injecting sand-carrying fluid into the oil sleeve annulus 6 by using a displacement pump of 7.0m 3/min; at the perforation position 3, high-flow-rate supercritical carbon dioxide impacts sand-carrying fluid to form supercritical carbon dioxide foam, and under the action of annular pressure and injection pressure, the supercritical carbon dioxide foam carries propping agent to enter the artificial crack 8 to prevent the artificial crack from closing;
Specifically, in the process, in order to form supercritical carbon dioxide foam at a perforation position, the pumping discharge capacity is not required to be too high, when the discharge capacity is 6.0m 3/min, the injection pressure reaches 42MPa, the injection speed reaches 60m/s, the sand-carrying fluid can be effectively impacted to form the supercritical carbon dioxide foam, and the formed foam sand ratio is 18%;
specifically, when the high-flow-rate supercritical carbon dioxide impacts the sand-carrying fluid to form foam, the sand ratio can be reduced by mixing the supercritical carbon dioxide with the water phase, so that the sand-carrying fluid with high sand ratio needs to be designed when the sand ratio is designed, and the foam sand ratio can still meet the construction requirement after the supercritical carbon dioxide foam is formed.
Step e, stopping pumping the sand-carrying fluid when the sand-carrying fluid consumption reaches the design consumption, pumping displacement fluid into the oil sleeve annulus 6, and displacing all the sand-carrying fluid in the oil sleeve ring into the artificial cracks to prevent sand blockage; after the displacement is finished, the pumping of the liquid carbon dioxide is stopped, the supercritical carbon dioxide jet fracturing tool 2 is closed, and the fracturing transformation is completed.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (6)
1. The supercritical carbon dioxide jet composite foam sand carrying fracturing method is characterized by comprising the following steps of:
step a, preparing construction materials and construction tools in advance according to construction requirements, wherein the construction materials comprise liquid carbon dioxide, foaming base liquid, propping agent and displacement liquid; the construction tool comprises a supercritical carbon dioxide jet fracturing tool and a coiled tubing;
Step b, using a continuous oil pipe to lower a supercritical carbon dioxide injection fracturing tool to a perforation, injecting pure liquid carbon dioxide into the continuous oil pipe, and pumping the pure liquid carbon dioxide with a pumping discharge capacity of 6.0-12.0m 3/min; the temperature and the pressure of the liquid carbon dioxide in the continuous oil pipe are gradually increased, and finally the liquid carbon dioxide becomes supercritical carbon dioxide; the supercritical carbon dioxide is sprayed to the fracturing reservoir through a nozzle of a supercritical carbon dioxide spraying fracturing tool to form an artificial crack, wherein in the spraying process, the spraying pressure is 40-90MPa, and the spraying speed is more than 100m/s;
step c, mixing the foaming base liquid and the propping agent in a sand mixing tank to form sand-carrying liquid, wherein the sand-carrying liquid-sand ratio is 20-40%;
Step d, after the construction curve on the fracturing pump truck is obviously reduced, injecting liquid carbon dioxide into the coiled tubing by a displacement pump of 3.0-6.0m 3/min, and simultaneously injecting sand-carrying fluid into the oil casing annulus by a displacement pump of 6.0-10.0m 3/min, wherein the injection pressure of the supercritical carbon dioxide is 20-40MPa, and the injection speed is 30-60m/s; at the perforation position, the supercritical carbon dioxide with high flow rate impacts the sand-carrying fluid to form supercritical carbon dioxide foam, the foam sand ratio is 10-30%, and the supercritical carbon dioxide foam carries propping agent to enter the artificial crack under the action of annular pressure and jet pressure to prevent the artificial crack from closing;
And e, stopping pumping when the sand-carrying fluid consumption reaches the designed consumption, pumping displacement fluid into the oil sleeve annulus, displacing all the sand-carrying fluid in the oil sleeve annulus into the artificial cracks, stopping pumping liquid carbon dioxide after displacement, and closing the supercritical carbon dioxide injection fracturing tool to finish fracturing transformation.
2. The supercritical carbon dioxide injection composite foam sand carrying fracturing method of claim 1, wherein the sand carrying fluid is a mixture of a foaming base fluid and a propping agent.
3. The method for fracturing sand carried by supercritical carbon dioxide jetting composite foam according to claim 2, wherein the foaming base fluid is a mixed aqueous solution of 1-10wt% of a multifunctional agent, 0.1-1wt% of a foaming agent, 0.08-0.2wt% of a cosurfactant, 0.5-3.5wt% of a corrosion inhibitor, 0.5-2.5wt% of a clay stabilizer and 0.5-5wt% of a viscosity regulator.
4. The supercritical carbon dioxide injection composite foam sand-carrying fracturing method according to claim 3, wherein the multifunctional agent can form worm-shaped micelles under the action of the viscosity regulator, so that the viscosity of sand-carrying fluid is improved, and a large amount of proppant is prevented from settling in an oil casing annulus; after the sand-carrying fluid forms foam under the impact of supercritical carbon dioxide, worm-shaped micelle formed by the multifunctional agent is adsorbed on the interface of the supercritical carbon dioxide foam, so that the stability of the supercritical carbon dioxide foam is improved, and the supercritical carbon dioxide foam is beneficial to carrying the propping agent to the deep part of the artificial crack.
5. The supercritical carbon dioxide injection composite foam sand-carrying fracturing method according to claim 3, wherein the multifunctional agent is one or a mixture of erucamide propyl hydroxysulfobetaine and erucamide propyl betaine;
The foaming agent is at least one of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate and alpha-alkenyl sodium sulfonate;
The cosurfactant is at least one of methanol, ethanol, propanol and butanediol;
The corrosion inhibitor is at least one of imidazoline, dicyclohexylamine nitrite, urotropine and sodium benzoate;
The clay stabilizer is potassium chloride;
the viscosity regulator is at least one of sodium chloride, calcium chloride and magnesium chloride.
6. The supercritical carbon dioxide injection composite foam sand-carrying fracturing method according to claim 2, wherein the propping agent is a low-density ceramsite propping agent or a quartz sand propping agent, and the particle size is one or a combination of 40-70 meshes or 70-140 meshes.
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