CN108612507B - Method for performing temporary plugging diversion fracturing by using shear thickening fluid - Google Patents
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- 239000012530 fluid Substances 0.000 title claims abstract description 42
- 230000008719 thickening Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005086 pumping Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 claims description 3
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002612 dispersion medium Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims 2
- 239000007787 solid Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001052 transient effect Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
A method of transient fracturing using shear thickening fluids comprising the steps of: the method comprises the following steps: preparing a shear thickening fluid STF; step two: after the packer sets the main layer section needing construction, the STF liquid is slowly conveyed into the crack by using the coiled tubing; step three: pumping the fracturing fluid into the well by using a ground high-pressure pipeline after the STF liquid is conveyed into the cracks, and gradually adjusting and increasing the pumping pressure of the fracturing fluid to suppress and build the cracks so as to form a new complex crack network in the stratum; according to the invention, the shear thickening fluid STF is injected into the stratum, and the temporary plugging effect is formed in the fracturing process to force the fracturing hydraulic fracturing direction to change, so that a new complex fracture network is formed, and the reservoir transformation effect is greatly improved.
Description
Technical Field
The invention relates to the field of hydraulic fracturing of petroleum engineering, in particular to a method for performing temporary plugging diversion fracturing by using shear thickening fluid.
Background
Due to the fact that the conventional oil and gas resources cannot meet the social requirements in recent years, development of unconventional reservoirs is increasingly deepened. The hydraulic fracturing technology has become a very effective means for developing oil and gas resources of unconventional reservoirs, however, in order to form sand-filled fractures with high conductivity in the reservoirs and greatly improve the yield of oil and gas wells, a plurality of fractures must be pressed in the stratum to form a complex multistage fracture network. The main defects of the conventional hydraulic fracturing technology at present are that multi-level complex fracture networks are difficult to press out in oil-gas-enriched reservoirs, most of the formed fracture networks are single in shape and small in transverse and longitudinal expansion, even some fracturing constructions can only press one fracture in the reservoir, the reservoir transformation is hardly affected, the fracturing efficiency is low, oil gas is difficult to transport and produce, and the yield after the fracturing construction is not remarkably improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for performing temporary plugging diversion fracturing by using shear thickening liquid.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of transient fracturing using shear thickening fluids comprising the steps of:
the method comprises the following steps: preparing a shear thickening fluid STF;
mixing PEG200, PEG400 and light condensate oil with the viscosity of 30-100mPa.s according to the volume ratio of 4: 2: 1 mixing as a dispersed phase, mixing the nano sio2(350nm or 600nm), graphene and carbon nanotubes are used as dispersion media according to the solid phase content (45-75%): 1%: 1 percent of the mixture is added, and the mixture is uniformly stirred by utilizing magnetic force and ultrasonic wave to prepare the shear thickening fluid STF.
Step two: after the packer sets the main layer section needing construction, the STF liquid is slowly conveyed into the crack by using the coiled tubing;
step three: and after the STF liquid is conveyed into the cracks, pumping the fracturing fluid into the well by utilizing a ground high-pressure pipeline, and gradually adjusting and increasing the pumping pressure of the fracturing fluid so as to suppress and build the cracks, thereby forming a new complex crack network in the stratum.
The second specific method comprises the following steps:
slowly conveying the shear thickening fluid STF prepared in the step one to a stratum fracture through a continuous oil pipe manifold by using a pump truck, wherein the thickness of the shear thickening fluid STF is not more than 0.5m in the pumping process3And (2) pumping with the displacement of/min, avoiding the pumping pressure from generating fluctuation as far as possible, and if the pumping pressure is suddenly increased at a speed of more than 200Pa/s, reducing the pumping pressure to below 1MPa in time, wherein the amount of the STF liquid pumped finally is based on 1/3 of the volume of the crack.
The concrete method of the third step is as follows:
and after the shear thickening fluid STF is pumped into the stratum, pumping out the coiled tubing, opening a fracturing truck valve to pump the fracturing fluid into the shaft, if the pressure is suddenly increased at a speed of more than 500Pa/s in the process of pumping the fracturing fluid into the stratum, gradually increasing the pumping pressure at a speed of 0.5MPa/s to suppress the pressure, and when the pressure is increased to 40-70 MPa, carrying out fracture building.
The invention has the following beneficial effects:
1. according to the novel temporary plugging steering technology provided by the invention, when the fracturing fluid displacement front edge contacts the fluid by utilizing the shear thickening effect of the shear thickening fluid STF, the pressure enough to generate a new crack can be suppressed in the reservoir crack, so that the temporary plugging effect is realized at the contact surface. The fracturing direction of the fracturing fluid is changed under the temporary plugging action, new fractures are pressed out of the reservoir to form a multi-stage complex fracture network, and a channel is provided for oil and gas migration, so that the yield of the reservoir is greatly improved.
2. The shear thickening liquid STF prepared by the invention can still keep good shear thickening special effect at the formation temperature of 60-100 ℃, and the addition of the graphene reduces the viscosity of the STF liquid at normal temperature, so that the liquid can be conveniently pumped into a reservoir fracture by a continuous oil pipe.
3. The light condensate oil is added when the shear thickening fluid STF is prepared, so that the shear thickening fluid STF has certain compatibility with a reservoir, and after the fracturing fluid is drained back, the shear thickening fluid STF prepared by the method does not need to be drained back and can be slowly drained out together with an oil gas flow in the production process. In addition, due to the shear thickening effect of the shear thickening liquid STF, imbibition is difficult to occur, so that damage to a reservoir is reduced to a great extent.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples in 6 blocks of the Changqing oilfield, but the present invention is not limited to the examples listed below.
Referring to fig. 1, a method for transient locked-up diversion fracturing using a shear thickening fluid, comprising the steps of:
the method comprises the following steps: preparing a shear thickening fluid STF;
firstly, preparing a shear thickening liquid STF, and mixing dispersed phase PEG200, PEG400 and light condensate oil (the viscosity is 45.7mPa.s at the normal temperature of 25 ℃) according to the following ratio of 4: 2: 1 proportion, then utilizing magnetic force to combine with ultrasonic stirrer to disperse medium nano sio2(650nm), graphene, carbon nanotubes in a solid phase content of 57%: 1%: 1 percent of the total weight is uniformly mixed with the dispersed phase, and the prepared liquid is kept stand in a vacuum drying oven for 48 hours and used after bubbles in the liquid are eliminated.
Step two: after setting a fracture interval which is mainly required to be constructed by using a packer, slowly conveying STF liquid into a fracture by using a coiled tubing;
before carrying out fracturing construction, whether the check pipeline is normal, whether have the problem of revealing liquid and unable normal pump sending, can begin fracturing construction after guaranteeing that the pipeline is normal.
Slowly conveying the prepared shear thickening fluid STF into a stratum fracture through a continuous oil pipe manifold by using a pump truck, wherein the pumping process is carried out at a speed of 0.35m3And slowly pumping at a displacement of/min, finding that the pressure increase speed reaches 300Pa/s in the pumping process, and stably displacing by reducing the pumping pressure to 0.8MPa in time. The displacement was stopped at 1/3 where the final pumped volume reached the fracture volume.
Step three: after the shear thickening fluid STF is pumped in, the continuous oil pipe is pumped out, and the fracturing truck valve is opened to enable the fracturing fluid to be 1.5m3/min-2m3Pumping into the crack at a speed of/min, pumping the fracturing fluid into the formation crack at a speed of 750Pa/s after 7min, gradually increasing the pumping pressure at a speed of 0.5MPa/min to build the pressure, and forming the crack when the pressure is increased to 50 MPa.
And after the seam is formed, the fracturing fluid is drained back, and construction operation of the next layer section is carried out.
And (3) in the fracturing process, if liquid leaks or the pressure approaches the construction requirement, closing the valve in time, and stopping constructing and inspecting the pipeline.
The above description is only a partial description of the preferred embodiments of the present invention, and any person skilled in the art may modify the above technical solutions. Therefore, any simple modifications or equivalent substitutions made according to the technical solution of the present invention belong to the scope of the claims of the present invention.
Claims (1)
1. A method of temporary frac using a shear thickening fluid comprising the steps of:
the method comprises the following steps: preparing a shear thickening fluid STF;
mixing PEG200, PEG400 and light condensate oil with the viscosity of 30-100mPa.s according to the volume ratio of 4: 2: 1 mixing as a dispersed phase, mixing the nano sio2Stone, stone and method for producing sameThe graphene and the carbon nano-tube are used as dispersion media according to the solid content (45-75%): 1%: 1 percent of the mixture is added, and the mixture is uniformly stirred by utilizing magnetic force and ultrasonic wave to prepare the shear thickening liquid STF;
step two: after the packer seats and seals the interval needing to be constructed, the STF liquid is slowly conveyed into the crack by using the coiled tubing;
step three: pumping the fracturing fluid into the well by using a ground high-pressure pipeline after the STF liquid is conveyed into the cracks, and gradually adjusting and increasing the pumping pressure of the fracturing fluid to suppress and build the cracks so as to form a new complex crack network in the stratum;
the second specific method comprises the following steps:
slowly conveying the shear thickening fluid STF prepared in the step one into a stratum fracture through a continuous oil pipe by using a pump truck, wherein the thickness of the shear thickening fluid STF is not more than 0.5m in the pumping process3The displacement pumping of/min avoids the pumping pressure from fluctuating as much as possible, if the pumping pressure is suddenly increased at a speed of more than 200Pa/s, the displacement is timely reduced, the pumping pressure is reduced to below 1MPa, and the amount of the STF liquid pumped finally is based on 1/3 of the crack volume;
the concrete method of the third step is as follows:
and after the shear thickening fluid STF is pumped into the stratum, pumping out the coiled tubing, opening a fracturing truck valve to pump the fracturing fluid into the shaft, if the pressure is suddenly increased at a speed of more than 500Pa/s in the process of pumping the fracturing fluid into the stratum, gradually increasing the pumping pressure at a speed of 0.5MPa/s to suppress the pressure, and when the pressure is increased to 40-70 MPa, carrying out fracture building.
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| CN109233783B (en) * | 2018-10-08 | 2021-02-26 | 西安石油大学 | Shear thickening liquid, modified degradable fiber based on shear thickening liquid, preparation method of modified degradable fiber and temporary plugging steering fracturing method |
| CN109630065B (en) * | 2018-12-07 | 2020-12-08 | 西安石油大学 | Method for making branch seam by using super absorbent resin for temporary blocking and pressure building |
| CN114806521B (en) * | 2021-01-19 | 2023-09-26 | 中国石油化工股份有限公司 | Preparation method of shear thickening temporary plugging agent, plugging agent and evaluation method |
| CN113006761B (en) * | 2021-03-25 | 2022-10-18 | 西安石油大学 | Volume fracturing method for opening multistage artificial branch fracture network in main fracture |
| CN114740149A (en) * | 2022-02-23 | 2022-07-12 | 陕西延长石油（集团）有限责任公司 | Device and method for evaluating plugging capability of temporary plugging diverting agent in non-uniform cracks |
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| US3955998A (en) * | 1973-06-21 | 1976-05-11 | Phillips Petroleum Company | Aqueous gels for plugging fractures in subterranean formation and production of said aqueous gels |
| CN102093864B (en) * | 2010-12-21 | 2013-07-10 | 中国石油天然气股份有限公司 | Temporary plugging diversion agent for refracturing of oil-water well and preparation method thereof |
| CN103306660B (en) * | 2012-03-13 | 2015-12-09 | 中国石油化工股份有限公司 | A kind of method of shale gas reservoir fracturing volume increase |
| CN104727800B (en) * | 2015-01-22 | 2017-07-25 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of temporary stall based on the modified vinal in surface is to fracturing process |
| CN105672970B (en) * | 2015-12-31 | 2019-04-09 | 中国石油天然气股份有限公司 | It is a kind of to realize in net horizontal section temporary stall to the method for multiple crack fracturing |
| CN107489411B (en) * | 2017-09-08 | 2019-09-03 | 中国石油天然气股份有限公司 | A kind of mechanical packing is the same as the temporarily stifled horizontal well refracturing method combined |
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