CN113969159A - Weighted slickwater fracturing fluid and preparation method thereof - Google Patents

Weighted slickwater fracturing fluid and preparation method thereof Download PDF

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Publication number
CN113969159A
CN113969159A CN202111317209.7A CN202111317209A CN113969159A CN 113969159 A CN113969159 A CN 113969159A CN 202111317209 A CN202111317209 A CN 202111317209A CN 113969159 A CN113969159 A CN 113969159A
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fracturing fluid
weighted
jhfr
pressure
agent
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Inventor
余维初
宋永涛
周东魁
张颖
舒文明
吴爱斌
高健津
肖想松
周五
余镭
李玉敏
杨世楚
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Modern Oil Sience & Technology Co ltd Of Jingzhou
Yangtze University
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Modern Oil Sience & Technology Co ltd Of Jingzhou
Yangtze University
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    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/582—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of bacteria
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds

Abstract

The invention relates to weighted slickwater fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas field fracturing. The JHFR drag reducer, the JHFD multifunctional additive, the HE-BIO biological oil-displacing agent and the weighting agent are composed according to certain mass percentage, and the density is 1.17-2.10 g/cm3The resistance reducing rate is up to 66% under the condition of 30% calcium chloride weighting agent; the surface tension is as low as 23.4mN/m, and the interfacial tension is 10‑2~10‑3The anti-swelling rate is more than 80 percent between mN/m, the requirements of fracturing construction on low friction resistance, shale hydration inhibition, low reservoir damage and quick flowback are met, the requirements on construction equipment and tools are effectively reduced, the use is safe, the preparation is simple, the cost is low, and the application range is wideAnd the pump pressure reducing effect is good. The problems of large residue content, high friction resistance, low flowback rate, large using amount of clean fracturing fluid, high cost, poor salt resistance, low reachable density, poor pressure of a shaft fluid column and large application limitation after the gel breaking of the existing guanidine gum weighted fracturing fluid are solved.

Description

Weighted slickwater fracturing fluid and preparation method thereof
Technical Field
The invention relates to weighted slickwater fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas field fracturing.
Background
When the fracturing technology is applied to special oil and gas wells such as a high-pressure well, a deep well, an ultra-deep well and a compact oil and gas reservoir well, the major problem is that the construction pump pressure is too high, so that very high requirements are provided for fracturing construction equipment and tools, and the construction risk is greatly increased; at present, the heavy fracturing fluid and the liquid column pressure are adopted, and the method is a main method for reducing the pumping pressure of fracturing construction; chinese patent applications CN103232840A, CN103911138A, CN113355078A and CN109735319A disclose some heavy fracturing fluid formulas, and most of the heavy fracturing fluids are guanidine gum heavy fracturingOne of the fracturing fluid or the clean fracturing fluid is added with weighting agents such as sodium nitrate, potassium formate and the like to improve the liquid column pressure of a shaft so as to achieve the purposes of reducing the pressure of a well mouth and lightening the construction risk. However, in the actual construction process, the guanidine gum is not easy to dissolve, and has the problems of large residue content after gum breaking, high friction resistance and low flowback rate. After the weighting agent is added, the salt not only competes with the guar gum for water molecules to increase the dissolution time of the guar gum, but also increases the friction resistance of the fracturing fluid and the difficulty of breaking the fracturing fluid, and has poor pumping pressure reduction effect. In the well construction process of 7600m of certain well depth, the pump injection density is 1.35 g/cm3The oil pressure of the potassium formate weighted fracturing fluid is almost the same as that of the non-weighted fracturing fluid, so that the purpose of reducing the pumping pressure cannot be achieved. The clean fracturing fluid has the advantages of simple preparation, low friction, no residue, small damage to stratum, high flowback speed after construction and high flowback rate, but has large using amount, high cost, poor salt resistance, poor pressure of provided shaft fluid column and great application limitation. Therefore, it is very important to provide a weighting agent with wide sources, adjustable density, low friction resistance, simple preparation and low cost, which is widely applicable to high-pressure wells, deep wells, ultra-deep wells and compact oil and gas reservoirs.
Disclosure of Invention
The invention aims to provide the weighted slickwater fracturing fluid and the preparation method thereof aiming at the defects of the prior art, the compatibility among all treating agent components and between the whole fracturing fluid system and formation water is good, the variety of the matched weighting agents is multiple, and the maximum density of the fracturing fluid system can reach 2.10g/cm3. The fracturing fluid system has the advantages of simple preparation, low cost, low friction, obvious pressure reduction effect, high flowback rate and the like, and even under 30% of calcium chloride weighting agent, the resistance reduction rate of the fracturing fluid system reaches 66%; the surface tension of the weighted slickwater fracturing fluid system is as low as 23.4mN/m, and the interfacial tension is 10-2~10-3The requirements of fracturing site construction on low friction resistance, shale hydration inhibition, low reservoir damage and quick flowback are met between mN/m, the requirements on construction equipment and tools are effectively reduced, and the construction is improvedThe safety and the success rate are widely suitable for the construction of high-pressure wells, deep wells, ultra-deep wells and compact oil and gas reservoirs.
The invention realizes the purpose through the following technical scheme:
the weighted slickwater fracturing fluid is characterized by being composed of the following components in percentage by mass:
JHFR drag reducing agent: 0.05% -0.20%;
JHFD multifunctional additive: 0.1% -0.3%;
HE-BIO biological oil-displacing agent: 0.4% -0.6%;
weighting agent: 15% -84%;
water: and (4) the balance.
Wherein: the JHFR drag reducer, the JHFD multifunctional additive, the HE-BIO biological oil displacement agent and the special weighting agent are products produced by modern petroleum technology development limited company in Jingzhou city;
the JHFR drag reducer is one of JHFR-2A or JHFR-2D;
the weighting agent is one or more of sodium chloride, potassium chloride, special weighting agent, calcium chloride, sodium bromide, calcium bromide, sodium formate, potassium formate and cesium formate.
The density of the weighted slickwater fracturing fluid is 1.17-2.10 g/cm3Is adjustable.
Further optimized, the weighted slickwater fracturing fluid and the preparation method thereof are characterized in that the weighted slickwater fracturing fluid comprises the following components in percentage by mass:
JHFR drag reducing agent: 0.1 percent;
JHFD multifunctional additive: 0.2 percent;
HE-BIO biological oil-displacing agent: 0.5 percent;
special weighting agent: 70 percent of
Water: and (4) the balance.
A preparation method of weighted slickwater fracturing fluid is characterized by comprising the following steps:
adding a JHFR drag reducer, a JHFD multifunctional additive and HE-BIO biological oil displacement agent into water, and stirring for 30min to dissolve the three components, wherein the three components can be added in a non-sequential manner;
step two, obtaining a relational expression (2) of the density of the fracturing fluid and the well depth by converting a well mouth pressure formula (1), calculating the required density of the fracturing fluid during construction according to the relational expression (2), adding a weighting agent, and stirring for 30min until the weighting agent is completely dissolved to obtain the weighted slickwater fracturing fluid;
the wellhead pressure formula is as follows:
Figure 5291DEST_PATH_IMAGE001
wherein:
Figure 20301DEST_PATH_IMAGE002
bottom hole burst pressure, MPa;
Figure 800039DEST_PATH_IMAGE003
in terms of friction loss, MPa;
Figure 523144DEST_PATH_IMAGE004
the pressure of the wellbore liquid column is MPa.
Converting the formula (1) to obtain a relation between the density of the fracturing fluid and the well depth as follows:
Figure 806358DEST_PATH_IMAGE005
wherein:
Figure 628820DEST_PATH_IMAGE006
to increase the density of the fracturing fluid, g/cm3；
Figure 223750DEST_PATH_IMAGE007
The wellhead pressure is MPa;
Hdepth of layer for purpose, m;
Figure 750546DEST_PATH_IMAGE008
bottom hole burst pressure, MPa;
Figure 419425DEST_PATH_IMAGE009
in terms of friction loss, MPa;
Figure 881630DEST_PATH_IMAGE010
wellbore fluid column pressure, MPa.
Compared with the prior art, the invention has the beneficial effects that:
the density of the weighted slickwater fracturing fluid disclosed by the invention is 1.17-2.10 g/cm3The method is adjustable, a proper weighted fracturing fluid system is provided for solving the transformation of oil and gas reservoirs with high temperature, high pressure, low permeability and ultra-low permeability, and the reservoir transformation effect is good; when a shallow reservoir is reformed, a special weighting agent with wide source and low price can be used, and the density can be adjusted to 1.56g/cm3The method meets the transformation requirements of most shallow oil and gas reservoirs in China, and effectively reduces the transformation cost of the shallow oil and gas reservoirs.
When deep well and ultra-deep well reservoir fracturing is carried out, additives such as bactericide, cleanup additive, cross-linking agent, gel breaker and the like are not required to be added in the construction process, only the additives with small dosage and low price are required to be used, and the overall cost is effectively reduced;
the low-viscosity fluid of the heavy slickwater fracturing fluid can generate a more complex fracture network, provides a better flow guide channel, is applied to a low-permeability reservoir such as shale gas, can improve the contact area of the fracturing fluid and the reservoir, and reduces the length of a diffusion path, thereby improving the productivity. Compared with the traditional station type liquid distribution mode, all additives in the weighted slickwater fracturing fluid system are micromolecule and instant products, the on-site instant preparation and injection can be realized without a buffer tank and other auxiliary equipment, the continuous fracturing operation can be rapidly expanded, and the on-site construction operation is very convenient.
The heavy slickwater fracturing fluid can adopt one or more of sodium chloride, potassium chloride, special weighting agents, calcium chloride, sodium bromide, calcium bromide, sodium formate and potassium formate as the weighting agents, and the selectable weighting agents are various; when 30% of calcium chloride is added, the drag reduction rate of the weighted slickwater fracturing fluid system can still be larger than 64%, the pressure reduction amplitude can reach 20-40%, and wellhead pressure-bearing equipment is effectively protected.
The surface tension of the JHFD multifunctional additive is as low as 23.4mN/m, and the interfacial tension is 10-2~10-3The anti-swelling rate is more than 80 percent between mN/m, and the anti-swelling and discharge-assisting effects are good; not only has good inhibition clay expansion effect, effectively prevents the granule migration, still has the advantage that wetting properties is good, the flowback rate is high, effectively reduces the injury of fracturing fluid to the reservoir.
The nutrient solution in the HE-BIO biological oil displacement agent can activate microorganisms in an oil layer, generate carbon dioxide in a reservoir, reduce the viscosity of crude oil and the tension of an oil-water interface, have strong emulsifying capacity on the crude oil, form an emulsion mainly comprising oil-in-water, have good cleaning and displacement effects, and is beneficial to improving the recovery ratio of the crude oil in a low-permeability reservoir. The weighted slickwater fracturing fluid has good compatibility with a reservoir stratum and strong inhibition, and is beneficial to protecting an oil-gas layer. The invention aims to solve the problems of poor pump pressure reduction effect caused by large residue content, high friction resistance and low flowback rate after the gel breaking of the existing guanidine gum heavy fracturing fluid, and the problems of large using amount of clean fracturing fluid, high cost, poor salt resistance, low reachable density, poor pressure of a provided shaft fluid column and large application limitation.
Drawings
FIG. 1 is a graph of a weighted fracturing fluid construction pressure for a well using an existing fracturing fluid;
FIG. 2 is a graph showing the relationship between the amount of calcium chloride added and the drag reduction ratio in example 2 of the present invention;
FIG. 3 is a graph showing the density profile of a weighted fracturing fluid of example 3 of the present invention;
fig. 4 is a graph showing the density profile of a weighted fracturing fluid of example 4 of the present invention.
Detailed Description
The research and development ideas of the applicant of the invention are as follows:
the fracturing technology is one of important measures for modifying reservoir of oil and gas wells, increasing yield of oil wells, increasing injection of water wells and improving productivity and recovery ratio of oil and gas wells, along with continuous deepening of exploration and development of oil and gas fields, special oil and gas wells such as high-pressure wells, deep wells, ultra-deep wells and compact oil and gas reservoir wells are increased, and when the fracturing technology is applied to the oil and gas wells, the construction pump pressure is too high, so that very high requirements on fracturing construction equipment and tools are provided, and construction risks are greatly increased. The wellhead pressure at the surface is calculated by the following equation:
Figure 465320DEST_PATH_IMAGE011
wherein:
Figure 202332DEST_PATH_IMAGE012
bottom hole burst pressure, MPa;
Figure 194559DEST_PATH_IMAGE013
in terms of friction loss, MPa;
Figure 624403DEST_PATH_IMAGE014
the pressure of the wellbore liquid column is MPa.
And (3) converting the formula (1) to obtain a relational expression of the density of the fracturing fluid and the well depth:
Figure 193925DEST_PATH_IMAGE015
in equation (2):
Figure 469049DEST_PATH_IMAGE016
to increase the density of the fracturing fluid, g/cm3;
Figure 705995DEST_PATH_IMAGE017
The wellhead pressure is MPa;Hdepth of layer for purpose, m;
Figure 41161DEST_PATH_IMAGE018
bottom hole burst pressure, MPa;
Figure 973345DEST_PATH_IMAGE019
in terms of friction loss, MPa;
Figure 52160DEST_PATH_IMAGE020
wellbore fluid column pressure, MPa.
From the formula (2), the pressure of the wellhead is reduced mainly by two modes of increasing the pressure of a liquid column of the shaft and reducing the friction loss; at present, the heavy fracturing fluid is adopted, the increase of the liquid column pressure is a main means for reducing the pressure of a fracturing construction pump, and the density of the fracturing fluid is increased by 0.1 g/cm each time3And for a reservoir with the burial depth of 5000 m, the construction pressure of a wellhead can be reduced by 4-5 MPa. Chinese patent applications CN103232840A, CN103911138A, CN113355078A and CN109735319A all disclose some heavy fracturing fluid formulas, but most of the heavy fracturing fluids are guanidine gum heavy fracturing fluids and clean fracturing fluids, and the heavy agents such as sodium nitrate, potassium formate and the like are added to increase the liquid column pressure of a shaft so as to achieve the purposes of reducing the pressure of a well mouth and lightening the construction risk. However, in the actual use process, the guanidine gum has the problems of difficult dissolution, large residue content after gum breaking, high friction resistance and low flowback rate, so after the weighting agent is added, the salt not only competes with the guanidine gum for water molecules to increase the dissolution time of the guanidine gum, but also increases the friction resistance of the fracturing fluid and the difficulty of breaking the gum of the fracturing fluid, and reduces the viscosity of the gum breaking liquid. (see fig. 1) fig. 1 is a graph of the pressure at which a well weighted fracturing fluid is applied using an existing fracturing fluid.
The well depth was 7600m, as can be seen from FIG. 1 above, the pump density was 1.35 g/cm3The oil pressure of the potassium formate weighted fracturing fluid is almost the same as that of a non-weighted fracturing fluid, and the potassium formate weighted fracturing fluid does not achieve the purpose of reducing construction pressure. The molecular weight of the additive used in the existing clean fracturing fluid is very small, which is only about 1/5000 of the relative molecular weight of the guanidine gum, and the additive has the advantages of simple preparation, low friction, no residue, little damage to the stratum, high flowback speed after construction, high flowback rate and the like, but the additive has high manufacturing cost and large using amount, and the provided shaft fluid column has poor pressure and large application limitation. Thus providing a low density, low friction, low cost, high flowback rateHigh weighted fracturing fluids are a problem to be solved in the art. The invention provides a weighted slickwater fracturing fluid and a preparation method thereof for research and development, not only has wide sources of weighting agents, adjustable density according to well depth, low friction resistance and low preparation cost, is simple to operate, but also is widely suitable for high-pressure wells, deep wells, ultra-deep wells and compact oil and gas reservoirs, effectively reduces construction pump pressure, reduces the requirements on matched construction equipment and tools, and improves the safety and success rate of construction.
The concrete implementation of the weighted slickwater fracturing fluid and the preparation method thereof are further explained in detail below;
the weighted slickwater fracturing fluid is characterized by being composed of the following components in percentage by mass:
JHFR drag reducing agent: 0.05% -0.20%;
JHFD multifunctional additive: 0.1% -0.3%;
HE-BIO biological oil-displacing agent: 0.4% -0.6%;
weighting agent: 15% -84%;
water: and (4) the balance.
Wherein: the JHFR drag reducer, the JHFD multifunctional additive, the HE-BIO biological oil displacement agent and the special weighting agent are products produced by modern petroleum technology development limited company in Jingzhou city;
the JHFR drag reducer is one of JHFR-2A or JHFR-2D;
the weighting agent is one or more of sodium chloride, potassium chloride, special weighting agent, calcium chloride, sodium bromide, calcium bromide, sodium formate, potassium formate and cesium formate.
The density of the weighted slickwater fracturing fluid is 1.17-2.10 g/cm3Is adjustable.
Further optimized, the weighted slickwater fracturing fluid and the preparation method thereof are characterized in that the weighted slickwater fracturing fluid comprises the following components in percentage by mass:
JHFR drag reducing agent: 0.1 percent;
JHFD multifunctional additive: 0.2 percent;
HE-BIO biological oil-displacing agent: 0.5 percent;
special weighting agent: 70 percent of
Water: balance of
A preparation method of weighted slickwater fracturing fluid is characterized by comprising the following steps:
adding a JHFR drag reducer, a JHFD multifunctional additive and HE-BIO biological oil displacement agent into water, and stirring for 30min to dissolve the three components, wherein the three components can be added in a non-sequential manner;
step two, obtaining a relational expression (2) of the density of the fracturing fluid and the well depth by converting a well mouth pressure formula (1), calculating the required density of the fracturing fluid during construction according to the relational expression (2), adding a weighting agent, and stirring for 30min until the weighting agent is completely dissolved to obtain the weighted slickwater fracturing fluid;
the wellhead pressure formula is as follows:
Figure 143612DEST_PATH_IMAGE022
wherein:
Figure 915259DEST_PATH_IMAGE024
bottom hole burst pressure, MPa;
Figure 692329DEST_PATH_IMAGE026
in terms of friction loss, MPa;
Figure 574834DEST_PATH_IMAGE028
the pressure of the wellbore liquid column is MPa.
Converting the formula (1) to obtain a relation between the density of the fracturing fluid and the well depth as follows:
Figure 130581DEST_PATH_IMAGE030
wherein:
Figure 73129DEST_PATH_IMAGE032
to increase the density of the fracturing fluid, g/cm3；
Figure 104539DEST_PATH_IMAGE034
The wellhead pressure is MPa;
Hdepth of layer for purpose, m;
Figure 525156DEST_PATH_IMAGE036
bottom hole burst pressure, MPa;
Figure 325622DEST_PATH_IMAGE038
in terms of friction loss, MPa;
Figure 439071DEST_PATH_IMAGE040
wellbore fluid column pressure, MPa.
Example 1:
the weighted slickwater fracturing fluid described in the embodiment 1 consists of the following components in percentage by mass:
0.1% of JHFR-2A drag reducer, 0.2% of JHFD multifunctional additive, 0.5% of HE-BIO biological oil displacement agent, 15-30% of calcium chloride and the balance of water.
The weighted slickwater fracturing fluid system obtained in example 1 was subjected to a drag reduction test: the experimental instrument is a high-temperature high-pressure slickwater drag reduction tester, the experimental temperature is 25 ℃, the pipe diameter is 10mm, and the discharge capacity is 30L/min. The resistance reduction rate of the weighted slickwater fracturing fluid system in example 1 is measured according to the change of the concentration of calcium chloride, (see figure 2) figure 2 is a graph of the relationship between the addition amount of the calcium chloride and the resistance reduction rate of the invention, and it can be seen that the resistance reduction rate of the weighted slickwater fracturing fluid system in example 1 is always more than 60% under the discharge capacity test.
Example 2:
the weighted slickwater fracturing fluid described in the embodiment 2 consists of the following components in percentage by mass:
0.1% of JHFR-2D drag reducer, 0.2% of JHFD multifunctional additive, 0.5% of HE-BIO biological oil displacement agent, 15-45% of sodium formate and the balance of water.
The surface tension, interfacial tension and anti-swelling rate of the weighted slickwater fracturing fluid system obtained in example 2 were respectively tested, and the test results are shown in table 1. As can be seen from table 1, the weighted slickwater fracturing fluid system of example 2 has lower surface tension, interfacial tension, and higher anti-swelling properties.
Table 1 weighted slickwater fracturing fluid performance test results
Figure DEST_PATH_IMAGE042
Example 3:
the weighted slickwater fracturing fluid described in the embodiment 3 consists of the following components in percentage by mass:
0.05% -0.2% of JHFR-2D drag reducer, 0.2% of JHFD multifunctional additive, 0.5% of HE-BIO biological oil displacement agent, 20% of sodium nitrate and the balance of water.
Carrying out drag reduction test on the weighted slickwater fracturing fluid system obtained in the example 3, wherein an experimental instrument is a high-temperature high-pressure slickwater drag reduction tester, the experimental temperature is 25 ℃, the pipe diameter is 10mm, and the discharge capacity is 30L/min; the drag reduction ratio of the weighted slickwater fracturing fluid system of example 3 was determined as a function of JHFR-2D drag reducer concentration (see fig. 3), and from fig. 3 it can be seen that the drag reduction ratio of the weighted slickwater fracturing fluid increased as the JHFR-2D drag reducer concentration increased. Fig. 3 is a graph showing the density profile of a weighted fracturing fluid of example 3 of the present invention.
Example 4:
the weighted slickwater fracturing fluid described in this embodiment 4 consists of the following components in percentage by mass:
0.1% of JHFR-2D drag reducer, 0.2% of JHFD multifunctional additive, 0.5% of HE-BIO biological oil-displacing agent, 20-84% of special weighting agent and the balance of water.
The density of the special weighting agent was tested at 80 deg.C (see FIG. 4) for the weighted slickwater fracturing fluid system obtained in example 4, and the density of the weighted slickwater fracturing fluid weighted with the special weighting agent could reach 1.65g/cm3And the requirements of fracturing transformation of most of oil and gas reservoirs in China can be met. Fig. 4 is a graph showing the density profile of a weighted fracturing fluid of example 4 of the present invention.
Example 5:
the weighted slickwater fracturing fluid described in this example 5 consists of the following components in percentage by mass:
0.1% of JHFR-2A drag reducer, 0.2% of JHFD multifunctional additive, 0.4% -0.6% of HE-BIO biological oil displacement agent, 20% of sodium formate and the balance of water.
The viscosity reduction efficiency and the oil displacement efficiency of the weighted slickwater fracturing fluid system obtained in the example 5 and crude oil are tested, and the test results are shown in table 2:
table 2 weighted slickwater fracturing fluid performance test results
Figure DEST_PATH_IMAGE044
Example 6:
the weighted slickwater fracturing fluid described in this example 6 is composed of the following components in percentage by mass:
0.1% of JHFR-2A drag reducer, 0.1-0.3% of JHFD multifunctional additive, 0.5% of HE-BIO biological oil displacement agent, 32% of sodium formate, 8% of potassium formate and the balance of water.
The surface tension, interfacial tension and anti-swelling rate of the weighted slickwater fracturing fluid system obtained in example 6 were respectively tested, and the test results are shown in table 3. It can be seen from table 3 that the weighted slickwater fracturing fluid system has lower surface tension, interfacial tension and higher anti-swelling properties.
TABLE 3 weighted slickwater fracturing fluid Performance test results
Figure DEST_PATH_IMAGE046
The preparation method of the weighted slickwater fracturing fluid is characterized by comprising the following steps: adding a JHFR drag reducer, a JHFD multifunctional additive and HE-BIO biological oil displacement agent into water, stirring for dissolving, wherein the stirring time is at least 30min, and the three components can be added in a non-sequential manner. Then obtaining a relational expression (2) of the density of the fracturing fluid and the well depth by converting the wellhead pressure formula (1) according to the wellhead pressure formula (1), calculating the required density of the fracturing fluid during construction according to the formula (2), adding a weighting agent, and stirring for 30min until the weighting agent is completely dissolved to obtain the weighted slickwater fracturing fluid; calculating the required density of the fracturing fluid during construction by depending on a relational expression (2) of the density of the fracturing fluid and the well depth, adding the required weighting agent, and stirring until the weighting agent is completely dissolved to obtain the weighted slickwater fracturing fluid.
The above description is only a preferred embodiment of the present invention, and the above illustration is not to be construed as limiting the spirit of the present invention in any way, and any simple modifications or variations of the above embodiments, and equivalent embodiments which may be altered or modified by the technical content disclosed above, will still fall within the technical scope of the present invention, after reading the present specification, by a person of ordinary skill in the art without departing from the spirit and scope of the present invention.

Claims (3)

1. The weighted slickwater fracturing fluid is characterized in that: the paint comprises the following components in percentage by mass:
JHFR drag reducing agent: 0.05% -0.20%;
JHFD multifunctional additive: 0.1% -0.3%;
HE-BIO biological oil-displacing agent: 0.4% -0.6%;
weighting agent: 15% -84%;
water: the balance;
wherein: the JHFR drag reducer, the JHFD multifunctional additive, the HE-BIO biological oil displacement agent and the special weighting agent are products produced by modern petroleum technology development limited company in Jingzhou city;
the JHFR drag reducer is one of JHFR-2A or JHFR-2D;
the weighting agent is one or more of sodium chloride, potassium chloride, special weighting agent, calcium chloride, sodium bromide, calcium bromide, sodium formate, potassium formate and cesium formate;
the density of the weighted slickwater fracturing fluid is 1.17-2.10 g/cm3Is adjustable.
2. A weighted slickwater fracturing fluid as claimed in claim 1, wherein: the weighted slickwater fracturing fluid comprises the following components in percentage by mass:
JHFR drag reducing agent: 0.1 percent;
JHFD multifunctional additive: 0.2 percent;
HE-BIO biological oil-displacing agent: 0.5 percent;
special weighting agent: 70 percent of
Water: and (4) the balance.
3. A preparation method of weighted slickwater fracturing fluid is characterized by comprising the following steps:
adding a JHFR drag reducer, a JHFD multifunctional additive and HE-BIO biological oil displacement agent into water, and stirring for 30min to dissolve the three components, wherein the three components can be added in a non-sequential manner;
step two, obtaining a relational expression (2) of the density of the fracturing fluid and the well depth by converting a well mouth pressure formula (1), calculating the required density of the fracturing fluid during construction according to the relational expression (2), adding a weighting agent, and stirring for 30min until the weighting agent is completely dissolved to obtain the weighted slickwater fracturing fluid;
the wellhead pressure formula is as follows:
Figure DEST_PATH_IMAGE002
wherein:
Figure DEST_PATH_IMAGE004
bottom hole burst pressure, MPa;
Figure DEST_PATH_IMAGE006
in terms of friction loss, MPa;
Figure DEST_PATH_IMAGE008
the pressure of a shaft liquid column is MPa;
converting the formula (1) to obtain a relation between the density of the fracturing fluid and the well depth as follows:
Figure DEST_PATH_IMAGE010
wherein:
Figure DEST_PATH_IMAGE012
to increase the density of the fracturing fluid, g/cm3；
Figure DEST_PATH_IMAGE014
The wellhead pressure is MPa;
Figure DEST_PATH_IMAGE016
depth of layer for purpose, m;
Figure DEST_PATH_IMAGE018
bottom hole burst pressure, MPa;
Figure DEST_PATH_IMAGE020
in terms of friction loss, MPa;
Figure DEST_PATH_IMAGE022
wellbore fluid column pressure, MPa.
CN202111317209.7A 2021-11-09 2021-11-09 Weighted slickwater fracturing fluid and preparation method thereof Pending CN113969159A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103589416A (en) * 2013-11-19 2014-02-19 中国石油天然气股份有限公司 Low-friction recyclable slickwater fracturing fluid suitable for compact oil and gas reservoirs and preparation method thereof
CN110685656A (en) * 2019-10-11 2020-01-14 长江大学 Fracturing and three-mining integrated construction method for low-permeability oil reservoir

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103589416A (en) * 2013-11-19 2014-02-19 中国石油天然气股份有限公司 Low-friction recyclable slickwater fracturing fluid suitable for compact oil and gas reservoirs and preparation method thereof
CN110685656A (en) * 2019-10-11 2020-01-14 长江大学 Fracturing and three-mining integrated construction method for low-permeability oil reservoir

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王丽伟，等: "深层油气用加重滑溜水压裂液体系", 《钻 井 液 与 完 井 液》 *
邢继钊; 张颖; 周东魁; 余维初; 戴彩丽; 雷盼盼: "乌里雅斯太凹陷砂砾岩油藏压裂三采一体化技术与应用", 《长江大学学报(自然科学版) 》 *

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