CN114934764A - System and method for performing dense gas high-strength sand fracturing - Google Patents
System and method for performing dense gas high-strength sand fracturing Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000012530 fluid Substances 0.000 claims abstract description 142
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 238000002156 mixing Methods 0.000 claims description 112
- 238000005086 pumping Methods 0.000 claims description 34
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 6
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- 239000004568 cement Substances 0.000 claims description 2
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- 239000003129 oil well Substances 0.000 abstract description 3
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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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
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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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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
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Abstract
The invention discloses a system and a method for carrying out high-strength sand fracturing of dense gas, belonging to the technical field of gas field fracturing engineering, and aiming at a dense gas reservoir, after low-viscosity fracturing fluid with two shaft volumes is added in a pad fluid stage, low-concentration fracturing fluid is adopted for carrying out low-sand-ratio sand fracturing; and after adding sand into two steps, changing the high-viscosity fracturing fluid to perform high sand ratio sand adding until the sand adding is finished to design the sand amount, and then replacing the sand carrying fluid in the shaft with low viscous fluid. The contrast test verifies that the sand adding method can effectively improve the flow conductivity of the crack, slow down the yield decreasing rate of the oil-gas well, reduce the dosage of the fracturing fluid and achieve the aims of cost reduction and efficiency improvement; and the problems that the conventional fracturing method is large in ground liquid entering amount and difficult in later-stage flowback, cracks with relatively high flow conductivity are formed, the initial yield of a gas well is improved, the reduction speed of the later-stage production yield of the oil well is high and the like are solved.
Description
Technical Field
The invention belongs to the technical field of gas reservoir engineering fracturing, relates to a system for performing tight gas high-strength sand fracturing, and further relates to a method for performing tight gas high-strength sand fracturing.
Background
The conventional compact gas agent fracturing method is to inject a large amount of low-viscosity fracturing fluid in a pad fluid stage and add 1m of fracturing fluid in the middle 3 The proppant plays the roles of making seams in the early stage, polishing seams and reducing the difficulty of adding sand in the later stage. The fracturing fluid volume that this mode was added is too big, has improved construction cost, and a large amount of income well fluid volume also causes the tight gas well problem that often appears the flowback difficulty. Meanwhile, the sand adding difficulty of the compact gas reservoir is high, the average sand ratio of the conventional sand adding mode is relatively low, the sand ratio is forcibly increased to cause the construction pressure to quickly rise and exceed the construction pressure limit, the amount of the support agent in the formed crack is small, the crack flow conductivity is low, and the initial yield and the long-term accumulated yield of the gas well are influenced.
Therefore, in order to solve the problems that the conventional tight gas well fracturing method has a large ground liquid entering amount and the sand adding sand ratio is difficult to increase, it is necessary to design a tight gas high-strength sand adding fracturing method and a fracturing system suitable for the fracturing method.
Disclosure of Invention
The invention aims to provide a system for carrying out dense gas high-strength sand fracturing, which solves the problems of large ground liquid entering amount, low average sand ratio and difficult sand adding at high sand ratio in the prior art.
The technical scheme adopted by the invention is that the system for carrying out the dense gas high-strength sand fracturing comprises a propping agent tank for containing propping agent, a first sand-carrying liquid tank for containing low-viscosity fracturing liquid, a second sand-carrying liquid tank for containing high-viscosity fracturing liquid, a sand mixing truck, a high-pressure pump truck and a fracturing pump truck, wherein the propping agent tank, the sand-carrying liquid tank and the sand-carrying liquid tank are connected to the sand mixing truck together, the sand mixing truck enters a well after being connected to a wellhead of an oil-gas well through the high-pressure pump truck (5) and a cement pump truck, and the fracturing pump truck is communicated to an oil jacket annulus of the wellhead of the oil-gas well; a centrifugal pump is arranged in the sand mixing truck, and a magnetic flowmeter is arranged at the inlet of the sand mixing truck.
The invention is characterized in that:
the high-pressure pump truck is a 2000-type high-pressure fracturing pump truck.
The fracturing pump truck is a 700 type fracturing pump truck.
The invention also aims to provide a method for carrying out dense gas high-strength sand fracturing, which is implemented according to the following steps:
step 1: and injecting low-viscosity fracturing fluid as a pad fluid at the wellhead of the gas well.
Step 2: mixing a proppant and a low-viscosity fracturing fluid into a first sand mixing fluid;
and step 3: injecting the first sand mulling liquid into a wellhead of a gas well to perform fracturing sand adding operation, and keeping the pressure balance in the oil casing;
and 4, step 4: mixing the proppant and the high-viscosity fracturing fluid into a second sand mixing fluid;
and 5: injecting the second sand mulling fluid into a wellhead of the gas well to perform fracturing sand adding operation, and keeping the pressure balance in the oil casing;
step 6: and after the fracturing sand adding operation is finished, injecting low-viscosity fracturing fluid into the wellhead of the gas well to perform fracturing displacement operation.
The invention is also characterized in that:
the method is implemented according to the following steps: the method comprises the following steps:
step 1: the method comprises the following steps of (1) filling a propping agent for fracturing into a propping agent tank, filling a low-viscosity fracturing fluid into a first sand carrying liquid tank, filling a high-viscosity sand carrying liquid into a second sand carrying liquid tank, and then connecting the propping agent tank, the first sand carrying liquid tank and the second sand carrying liquid tank to a sand mixing truck;
and 2, step: pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank into the sand mixing truck by using a centrifugal pump of the sand mixing truck;
and step 3: pumping the fracturing fluid in the sand mixing truck into a wellhead of an oil-gas well for fracturing through a fracturing pump truck, and starting the fracturing pump truck to balance the pressure in an oil casing;
and 4, step 4: pumping a propping agent and low-viscosity fracturing liquid into a sand mixing truck by using a centrifugal pump of the sand mixing truck to be mixed into first sand mixing liquid after the low-viscosity fracturing liquid is pumped, and accurately measuring the concentration of the sand mixing liquid by using a magnetic flowmeter;
and 5: pumping the propping agent and high-viscosity fracturing liquid in the second sand carrying liquid tank into a sand mixing truck by using a centrifugal pump of the sand mixing truck to be mixed into second sand mixing liquid, and accurately measuring the concentration of the sand mixing liquid by using a magnetic flowmeter;
and 6: pumping the fracturing blender in the fracturing blender truck into a wellhead of an oil-gas well for fracturing through a fracturing pump truck, and simultaneously starting the fracturing pump truck to balance the pressure in an oil sleeve according to a fracturing design;
and 7: after the designed sand amount is added, pumping the low-viscosity fracturing liquid in the first sand carrying fluid tank into a sand mixing truck by using a centrifugal pump of the sand mixing truck;
and 8: and pumping the fracturing fluid in the sand mulling vehicle into a wellhead of an oil-gas well for fracturing through a fracturing pump truck, and simultaneously starting the fracturing pump truck to balance the pressure in the oil casing.
The injection amount of the low-viscosity fracturing fluid in the step 1 is two well volumes.
The viscosity of the low-viscosity fracturing fluid is not lower than 30mPa.s, and the viscosity of the high-viscosity fracturing fluid is not lower than 80 mPa.s.
The sand concentration of the first sand mixing liquid is not more than 200kg/m 3 。
The sand concentration of the second sand mixing liquid is not less than 600kg/m 3 The average sand ratio is not less than 25%.
The sand concentration of the second sand mixing liquid is 120kg/m 3 Is gradually increased, but is not higher than 700kg/m 3 。
According to the fracturing system and method, the low sand ratio continuous sand adding is started in the pad fluid stage, so that the consumption of the non-sand-carrying fracturing fluid is reduced, the difficulty of increasing the sand concentration in the later period is reduced, the average sand ratio of the high-viscosity sand-carrying fluid in the later period is increased, and the problems that the conventional fracturing method is large in ground liquid entering amount, difficult to flowback in the later period, capable of forming cracks with relatively high flow conductivity, capable of increasing the initial yield of a gas well, and high in production yield reduction speed in the later period of the oil well are solved.
Drawings
FIG. 1 is a schematic diagram of the configuration of the system for performing tight gas high strength sand fracturing of the present invention.
In the figure, 1, a propping agent tank, 2, a first sand-carrying liquid tank, 3, a second sand-carrying liquid tank, 4, a sand mixing truck, 5, a high-pressure pump truck, 6, a fracturing pump truck and 7, an oil-gas well wellhead.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The system for carrying out the tight gas high-strength sand fracturing is shown in figure 1. The fracturing fluid mixing truck comprises a proppant tank 1 filled with a super proppant, a sand-carrying fluid tank 2 filled with low-viscosity fracturing fluid, a sand-carrying fluid tank 3 filled with high-viscosity fracturing fluid, a sand mixing truck 4, a high-pressure pump truck 5, a fracturing pump truck 6 and an oil-gas well mouth 7, wherein the proppant tank and the sand-carrying fluid tank are connected to the sand mixing truck together, the sand mixing truck enters a well after being connected to the oil-gas well mouth through the high-pressure pump truck, a centrifugal pump is arranged in the sand mixing truck, and a magnetic flowmeter is arranged at an inlet of the sand mixing truck. The high-pressure pump truck is a 2000-type high-pressure fracturing pump truck. Still be provided with 700 type fracturing pump trucks in the tight gas high strength sand fracturing system, fracturing pump truck communicates to the oil jacket annular space of oil gas well wellhead.
In order to solve the problems that the conventional compact gas well fracturing method is large in ground liquid entering amount and difficult in flowback and sand adding ratio is difficult to improve, reduce the using amount of fracturing liquid, form cracks with relatively high long-term flow conductivity, slow down the production yield reduction speed in the later period of an oil and gas well and the like, the method for carrying out compact gas high-strength sand adding fracturing by using the system is provided. The invention is illustrated in detail by the following 3 examples.
Example 1:
the method comprises the following steps: the method comprises the following steps of (1) loading a propping agent for fracturing into a propping agent tank 1, loading a low-viscosity fracturing fluid into a first sand-carrying fluid tank 2, loading a high-viscosity sand-carrying fluid into a first sand-carrying fluid tank 3, and then connecting the propping agent tank 1, the first sand-carrying fluid tank 2 and a second sand-carrying fluid tank 3 to a sand mixing truck 4 together; wherein the viscosity of the low-viscosity fracturing fluid is 30mPa.s, and the viscosity of the high-viscosity fracturing fluid is 80 mPa.s. The injection fluid amount is the volume of the well bore of the fracturing stage plus 20m 3 . The volume of the well bore is 30m 3 The amount of the injected liquid was 50m 3 。
Step two: pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank 2 into the sand mixing truck 4 as a pad fluid by using a centrifugal pump of the sand mixing truck 4;
step three: pumping the fracturing fluid in the fracturing blender truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and simultaneously starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step four: pumping the low-viscosity fracturing fluid into two wells, pumping the proppant and the low-viscosity fracturing fluid into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form a first sand mixing fluid, and accurately measuring the concentration of the sand mixing fluid by using a magnetic flowmeter; the sand concentration of the first sand mixing liquid after mixing in the sand mixing truck is 200kg/m 3 According to 80kg/m 3 、120kg/m 3 The sand concentration is injected;
step five: pumping the mixed sand in the sand mixing truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and simultaneously starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step six: pumping the proppant and the high-viscosity fracturing fluid in the second sand-carrying fluid tank 3 into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form second sand mixing fluid, and accurately measuring the concentration of the second sand mixing fluid by using a magnetic flowmeter; the sand concentration of the second sand mixing liquid is 200kg/m 3 Not higher than 700kg/m 3 。
Step seven: the fracturing pump truck 5 is used for pumping the fracturing fluid in the fracturing truck 4 into a wellhead 7 of an oil-gas well for fracturing, and the fracturing pump truck 6 is started to balance the pressure in an oil sleeve.
Example 2:
the method comprises the following steps: packing fracturing proppantThe method comprises the following steps that 1, a propping agent tank 1 is filled with low-viscosity fracturing fluid into a first sand-carrying fluid tank 2, high-viscosity sand-carrying fluid is filled into a first sand-carrying fluid tank 3, and then the propping agent tank 1, the first sand-carrying fluid tank 2 and a second sand-carrying fluid tank 3 are connected to a sand mixing truck 4 together; wherein the viscosity of the low viscosity fracturing fluid is 50mPa.s, and the viscosity of the high viscosity fracturing fluid is 100 mPa.s. The injection fluid amount is the volume of the well bore of the fracturing stage plus 20m 3 . The well bore volume is now 40m 3 The amount of the injected liquid is 60m 3 。
Step two: pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank 2 into the sand mixing truck 4 as a pad fluid by using a centrifugal pump of the sand mixing truck 4;
step three: pumping the fracturing fluid in the fracturing blender truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step four: pumping the low-viscosity fracturing fluid into two wells, pumping the proppant and the low-viscosity fracturing fluid into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form a first sand mixing fluid, and accurately measuring the concentration of the sand mixing fluid by using a magnetic flowmeter; the sand concentration of the first sand mixing liquid after mixing in the sand mixing truck is 150kg/m 3 According to 80kg/m 3 、120kg/m 3 The sand concentration is injected;
step five: pumping the mixed sand in the sand mixing truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and simultaneously starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step six: pumping the proppant and the high-viscosity fracturing fluid in the second sand-carrying fluid tank 3 into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form second sand mixing fluid, and accurately measuring the concentration of the second sand mixing fluid by using a magnetic flowmeter; the sand concentration of the second sand mixing liquid is 220kg/m 3 Not higher than 700kg/m 3 。
Step seven: the fracturing pump truck 5 is used for pumping the fracturing fluid in the fracturing truck 4 into a wellhead 7 of an oil-gas well for fracturing, and the fracturing pump truck 6 is started to balance the pressure in an oil sleeve.
Example 3:
the method comprises the following steps: the proppant for fracturing is filled into a proppant tank 1, the low-viscosity fracturing fluid is filled into a first sand-carrying fluid tank 2, and the high-viscosity fracturing fluid is high in viscosityFilling the sand-carrying liquid into a first sand-carrying liquid tank 3, and then connecting the proppant tank 1, the first sand-carrying liquid tank 2 and a second sand-carrying liquid tank 3 to a sand mixing truck 4; wherein the viscosity of the low-viscosity fracturing fluid is 30mPa.s, and the viscosity of the high-viscosity fracturing fluid is 80 mPa.s. The injection liquid amount is the well bore volume of the fracturing stage plus 20m 3 . The volume of the well bore is 30m 3 The amount of the injected liquid was 50m 3 。
Step two: pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank 2 into the sand mixing truck 4 as a pad fluid by using a centrifugal pump of the sand mixing truck 4;
step three: pumping the fracturing fluid in the fracturing blender truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and simultaneously starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step four: pumping the low-viscosity fracturing fluid into two wells, pumping the proppant and the low-viscosity fracturing fluid into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form a first sand mixing fluid, and accurately measuring the concentration of the sand mixing fluid by using a magnetic flowmeter; the sand concentration of the first sand mixing liquid after mixing in the sand mixing truck is not more than 180kg/m 3 According to 80kg/m 3 、120kg/m 3 The sand concentration is injected;
step five: pumping the mixed sand in the sand mixing truck 4 into a wellhead 7 of an oil-gas well for fracturing through a fracturing pump truck 5, and simultaneously starting a fracturing pump truck 6 to balance the pressure in an oil casing;
step six: pumping the proppant and the high-viscosity fracturing fluid in the second sand-carrying fluid tank 3 into the sand mixing truck 4 by using a centrifugal pump of the sand mixing truck 4 to form second sand mixing fluid, and accurately measuring the concentration of the second sand mixing fluid by using a magnetic flowmeter; the sand concentration of the second sand mixing liquid is 230kg/m 3 Not higher than 700kg/m 3 。
Step seven: the fracturing pump truck 5 pumps the fracturing fluid in the fracturing pump truck 4 into the wellhead 7 of the oil-gas well for fracturing, and the fracturing pump truck 6 is started to balance the pressure in the oil sleeve.
In the above examples, the viscosity of the low viscosity fracturing fluid is not less than 30mpa.s, the viscosity of the high viscosity fracturing fluid is not less than 80mpa.s, and the injection fluid amount is the wellbore volume of the fracturing stage plus 20m 3 。
The sand mulling liquid in the sand mulling vehicle 4 must be pumped by a centrifugal pump according to a certain sand concentration, and the specific pump speed is based on the actual operation requirement; the settled proppant must be easily redispersed by the mixed liquid sand and fracturing fluid; the sand mixing liquid must be capable of being broken by a gel breaker so as to effectively reduce the damage of residues to the stratum.
The high-strength sand fracturing method of the dense gas comprises the steps of adding low-viscosity fracturing fluid with 2 times of well volume in a pad fluid stage, then starting sand adding with a low sand ratio, continuously adding sand with a high sand ratio of high-viscosity fluid, and not injecting pure liquid into the middle of the pad fluid, wherein a sand blender truck is required to be provided with a centrifugal pump and a magnetic flowmeter, and the concentration of the sand blending fluid is accurately measured by adopting centrifugal pump pumping and the magnetic flowmeter; after being mixed by a sand mixer, a propping agent, low-viscosity fracturing fluid and high-viscosity fracturing fluid are pumped into a wellhead of an oil-gas well through a 2000-type high-pressure fracturing pump truck, and after the 2000-type high-pressure fracturing pump truck is started, the 2000-type high-pressure fracturing pump truck and a 700-type fracturing pump truck are required to start to balance the pressure in an oil sleeve at the same time; the sand adding stage reduces the using amount of the non-sand-carrying fracturing fluid and the difficulty of improving the sand concentration in the later stage, improves the average sand ratio of the high-viscosity sand-carrying fluid in the later stage, further solves the problems of large ground liquid entering amount, low average sand ratio and low crack flow conductivity of the conventional fracturing method, and finally the crack flow conductivity formed by fracturing is more than 20 D.cm.
According to the invention, low-slime and high-viscosity liquid are stored in different sand carrying tanks respectively, so that low-slime low-sand-ratio sand carrying in a liquid pre-stage and high-sand-ratio continuous sand adding in a liquid carrying stage can be realized, the consumption of non-sand-carrying fracturing liquid and the difficulty in increasing the sand concentration in the later stage are reduced, the average sand ratio of high-viscosity sand-carrying liquid in the later stage is increased, and further the problems of large ground liquid entering amount, difficult flowback in the later stage, formation of cracks with relatively high flow conductivity, increase of the initial yield of a gas well, reduction of the production yield in the later stage of the oil well and the like are solved.
The method solves the problems that the sand adding difficulty of a compact gas reservoir is high, the average sand ratio of a conventional sand adding mode is relatively low, the construction pressure is rapidly increased and exceeds the construction pressure limit due to the forced increase of the sand ratio, the initial yield and the long-term accumulative yield of a gas well are influenced due to the small amount of the support agent in the formed crack and the low flow conductivity of the crack, the flow conductivity of the crack is effectively improved, the yield decreasing rate of the oil and gas well is slowed down, the using amount of fracturing fluid is reduced, and the purposes of cost reduction and efficiency improvement are achieved.
Claims (10)
1. The system for carrying out tight gas high-strength sand fracturing is characterized by comprising a proppant tank (1) for containing proppant, a first sand-carrying liquid tank (2) for containing low-viscosity fracturing liquid, a second sand-carrying liquid tank (3) for containing high-viscosity fracturing liquid, a sand mixing truck (4), a high-pressure pump truck (5) and a fracturing pump truck (6), wherein the proppant tank (1), the first sand-carrying liquid tank (2) and the second sand-carrying liquid tank (3) are jointly connected to the sand mixing truck (4), the sand mixing truck (4) is connected to an oil-gas well opening (7) through the high-pressure pump truck (5) and a cement pump truck (6) and then enters a well, and the fracturing pump truck (6) is communicated to an oil sleeve annulus of the oil-gas well opening (7); a centrifugal pump is arranged in the sand mixing truck (4), and a magnetic flowmeter is arranged at the inlet of the sand mixing truck (4).
2. The system for tight gas high strength sanding fracturing as defined in claim 1 wherein the high pressure pump truck (5) is a 2000 model high pressure fracturing pump truck.
3. The system for tight gas high strength sanding fracturing of claim 1, where the fracturing pump truck (6) is a type 700 fracturing pump truck.
4. The method for carrying out the dense gas high-strength sand fracturing is characterized by comprising the following steps of:
step 1: injecting low-viscosity fracturing fluid as pad fluid into a wellhead of the gas well;
step 2: mixing a proppant and a low-viscosity fracturing fluid into a first sand mixing fluid;
and step 3: injecting the first sand mixing liquid into a wellhead of the gas well to perform fracturing sand adding operation, and keeping the balance of the pressure in the oil casing;
and 4, step 4: mixing the proppant and the high-viscosity fracturing fluid into a second sand mixing fluid;
and 5: injecting the second sand mixing liquid into a wellhead of the gas well to perform fracturing sand adding operation, and keeping the balance of the pressure in the oil casing;
and 6: and after the fracturing sand adding operation is finished, injecting low-viscosity fracturing fluid into the wellhead of the gas well to perform fracturing displacement operation.
5. The method for carrying out tight gas high strength sand fracturing as claimed in claim 4, wherein it is carried out in particular according to the following steps: the method comprises the following steps:
step 1: the method comprises the steps of filling a propping agent for fracturing into a propping agent tank (1), filling a low-viscosity fracturing fluid into a first sand-carrying liquid tank (2), filling a high-viscosity fracturing fluid into a second sand-carrying liquid tank (3), and then connecting the propping agent tank (1), the first sand-carrying liquid tank (2) and the second sand-carrying liquid tank (3) to a sand mixing truck (4) together;
step 2: pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank (2) into the sand mixing truck (4) by using a centrifugal pump of the sand mixing truck (4);
and step 3: pumping the fracturing fluid in the fracturing blender truck (4) into a wellhead (7) of an oil-gas well for fracturing through a fracturing pump truck (5), and simultaneously starting a fracturing pump truck (6) to balance the pressure in an oil casing;
and 4, step 4: after the low-viscosity fracturing fluid is pumped, a proppant and the low-viscosity fracturing fluid are pumped into the sand mixing truck (4) by using a centrifugal pump of the sand mixing truck (4) to be mixed into a first sand mixing fluid, and the concentration of the sand mixing fluid is accurately measured by using a magnetic flowmeter;
and 5: pumping the propping agent and the high-viscosity fracturing fluid in the second sand-carrying fluid tank (3) into the sand mixing truck (4) by using a centrifugal pump of the sand mixing truck (4) to form a second sand mixing fluid, and accurately measuring the concentration of the sand mixing fluid by using a magnetic flowmeter;
and 6: pumping the mixed sand in the sand mixing truck (4) into a wellhead (7) of an oil-gas well for fracturing through a fracturing pump truck (5), and simultaneously starting a fracturing pump truck (6) to balance the pressure in an oil sleeve according to a fracturing design;
and 7: after the designed sand amount is added, pumping the low-viscosity fracturing fluid in the first sand-carrying fluid tank (2) into the sand mixing truck (4) by using a centrifugal pump of the sand mixing truck (4);
and 8: and pumping the fracturing fluid in the sand mixing truck (4) into an oil-gas well mouth (7) through a fracturing pump truck (5) for fracturing, and simultaneously starting a fracturing pump truck (6) to balance the pressure in the oil sleeve.
6. The method for tight gas high strength sand fracturing as claimed in claim 5, wherein the injection amount of the low viscosity fracturing fluid in step 1 is two well volumes.
7. The method for conducting tight gas high strength sand fracturing as recited in claim 5 wherein the viscosity of the low viscosity fracturing fluid is no less than 30mPa.s and the viscosity of the high viscosity fracturing fluid is no less than 80 mPa.s.
8. The method for tight gas high strength sand fracturing as claimed in claim 5, wherein the sand concentration of the first sand mixing fluid is not more than 200kg/m 3 。
9. The method for tight gas high strength sand fracturing as claimed in claim 5, wherein the sand concentration of the second sand mixing fluid is not less than 600kg/m 3 The average sand ratio is not less than 25%.
10. The method for conducting tight gas high strength sand fracturing as claimed in claim 5, wherein the sand concentration of the second sand blending liquid is 120kg/m 3 The step of (a) is gradually increased.
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| CN105781516A (en) * | 2016-03-30 | 2016-07-20 | 中国石油天然气股份有限公司 | Ultralow-density proppant fracturing method and fracturing system applicable to same |
| CN108952655A (en) * | 2017-05-18 | 2018-12-07 | 中国石油化工股份有限公司 | A kind of normal pressure shale gas sieve tube completion water-jet volume fracturing method |
| CN109386271A (en) * | 2017-08-03 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of horizontal well wears lamination cracking method |
| CN110159239A (en) * | 2019-05-06 | 2019-08-23 | 中国石油天然气股份有限公司 | Vertical well large-scale hydraulic fracturing oil jacket co-injection fracturing method |
| US20200370405A1 (en) * | 2019-05-23 | 2020-11-26 | Halliburton Energy Services, Inc. | Methods and applications of wide particle-size distribution proppant materials in subterranean formations |
| CN114059980A (en) * | 2020-07-29 | 2022-02-18 | 中国石油化工股份有限公司 | Shale reservoir fracturing method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105781516A (en) * | 2016-03-30 | 2016-07-20 | 中国石油天然气股份有限公司 | Ultralow-density proppant fracturing method and fracturing system applicable to same |
| CN108952655A (en) * | 2017-05-18 | 2018-12-07 | 中国石油化工股份有限公司 | A kind of normal pressure shale gas sieve tube completion water-jet volume fracturing method |
| CN109386271A (en) * | 2017-08-03 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of horizontal well wears lamination cracking method |
| CN110159239A (en) * | 2019-05-06 | 2019-08-23 | 中国石油天然气股份有限公司 | Vertical well large-scale hydraulic fracturing oil jacket co-injection fracturing method |
| US20200370405A1 (en) * | 2019-05-23 | 2020-11-26 | Halliburton Energy Services, Inc. | Methods and applications of wide particle-size distribution proppant materials in subterranean formations |
| CN114059980A (en) * | 2020-07-29 | 2022-02-18 | 中国石油化工股份有限公司 | Shale reservoir fracturing method |
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