CN117736719A - Medicament composition for improving suspension effect of propping agent and application thereof - Google Patents
Medicament composition for improving suspension effect of propping agent and application thereof Download PDFInfo
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Abstract
The invention belongs to the field of exploitation of petroleum, natural gas, shale gas and other fluid mineral products, and particularly relates to a medicament composition for improving a suspension effect of a propping agent and a preparation method thereof. The raw materials of the pharmaceutical composition comprise a surface modifier and fibers, wherein the surface modifier comprises an agent A, an agent B and a dispersion medium; the agent A is one or more of coco trimethyl ammonium chloride, dioctadecyl dimethyl ammonium bromide and laurylamine; the agent B is one or more of lactic acid, citric acid, acetic acid and hydrofluoric acid. The application method comprises the step of spraying the surface modification agent onto the surface of the propping agent, and adding the propping agent and the fibers into the fracturing fluid together for use. The preparation method is convenient and quick in raw materials, simple and environment-friendly, and the suspension rate of the propping agent in clean water and slick water can reach 100% at normal temperature by adopting the pharmaceutical composition and the use method, so that the preparation method has a good application prospect.
Description
Technical Field
The invention belongs to the field of exploitation of petroleum, natural gas, shale gas and other fluid mineral products, and particularly relates to a medicament composition for improving a suspension effect of a propping agent and application thereof.
Background
In unconventional reservoir development, hydraulic fracturing technology is an important means of increasing the production of target reservoir hydrocarbons. At present, the conventional fracturing technology uses fracturing fluid with certain viscosity to carry propping agent to the cracks, and increases the flow conductivity of hydraulic cracks, so that the yield increasing effect is achieved, and the propping agent mainly uses quartz sand and ceramsite at present. The research finds that the fracturing modification process has the following main problems: the viscosity of sand-carrying fluid after entering into the crack is reduced, and propping agent can not be quickly settled under the action of gravity and can not be moved to the far end of the crack, so that the effective supporting volume of the sand-carrying fluid in the transverse and longitudinal directions is small, the aim of large-scale efficient reservoir utilization is difficult to achieve, and the transformation effect is limited.
Chinese patent application CN106832145a discloses a gas suspension proppant suitable for slickwater fracturing, and methods of making and using the same. The gas suspension propping agent comprises orthopaedics particles, the surface of the propping agent is modified by hydrophobic and gas-philic emulsion, and the modified emulsion is prepared by polymerizing fluorine-containing polymer monomer, high polymer adhesive, silane coupling agent, surfactant and deionized water. According to the gas suspension propping agent, 10-20% of nitrogen is injected in the slickwater fracturing process, and the hydrophobic and gas-philic coating can adsorb tiny bubbles formed by the nitrogen in slickwater, so that the propping agent is still in a suspension state under a low-viscosity condition, the purpose of carrying sand by a cross-linking liquid is achieved, a large amount of organic materials are not needed to be used for improving the viscosity of the fracturing liquid, the stratum is not damaged, and flowback is facilitated.
Chinese patent application CN108084989a discloses an effervescent gas suspension propping agent suitable for slickwater fracturing and a method for preparing the same. The gas-suspended proppants require coating by application to conventional proppant surfaces, including inner and outer coatings. The outer coating is spray coated with an effervescent agent, which self-generates bubbles upon encountering water, which can adsorb to the surface of the inner coating, allowing it to float in the water. The inner coating is a hydrophobic and gas-philic coating and is prepared by solidifying hydrophobic and gas-philic emulsion. The propping agent is freely suspended in slick water, so that the purpose of carrying sand by common crosslinking liquid is achieved.
Chinese patent application CN114032085a discloses a high-efficiency gas suspension propping agent for fracturing and a preparation method thereof. The preparation method comprises the following steps: providing proppant particles, a surface modification treatment fluid, a modifier solution, and an organic molecular linking agent; stirring the proppant particles by using the surface modification treatment liquid at 25-120 ℃ to carry out surface roughening treatment, separating and drying to obtain the proppant particles subjected to surface roughening treatment; and mixing the proppant particles subjected to surface roughening treatment with the modifier solution and the organic molecular connecting agent, carrying out modification reaction, separating and drying to obtain the modified proppant. The propping agent can greatly reduce the requirement on fracturing fluid, and can achieve good suspension effect in different water-based fracturing fluids.
The three gas suspension propping agent modified agent formulas have the advantages of multiple types of agents and high cost; the volume of the compressed bubbles is reduced under the high-temperature and high-pressure reservoir condition to influence the suspension effect of the propping agent, and the fracture supporting volume is reduced; when large-displacement slick water is constructed, due to the fact that gas needs to be injected, the construction pressure is high due to the fact that the liquid column pressure is reduced, sand blocking risks are improved, and the application range is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a medicament composition for improving the suspension effect of a propping agent, which is characterized in that the surface of the propping agent is modified by using the medicament to change the surface of the propping agent from hydrophilic to hydrophobic, and the propping agent can interact with fibers in water to form a space network structure, so that the suspension effect of the propping agent in cracks is improved.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows:
a pharmaceutical composition for improving the laying effect of proppants, wherein the raw materials of the pharmaceutical composition comprise a surface modifier and fibers, and the surface modifier comprises an agent A, an agent B and a dispersion medium; the agent A is one or more of coco trimethyl ammonium chloride, dioctadecyl dimethyl ammonium bromide and laurylamine; the agent B is one or more of lactic acid, citric acid, acetic acid and hydrofluoric acid.
Preferably, the volume ratio of the agent A to the agent B to the dispersion medium is 2-5:0.5-2:83-97.
Preferably, the ratio of the agent A to the agent B to the dispersion medium to the fibers is 2-5ml:0.5-2ml:83-97ml:0.1-1.0g.
Preferably, the agent A is laurylamine.
Preferably, the agent B is citric acid or lactic acid.
Preferably, the fibers are polyester-based fibers.
Preferably, the dispersion medium is one or more of water, ethanol, ethylene glycol and methanol.
Preferably, the preparation method of the surface-modifying agent comprises the following steps:
(1) Adding the agent A into a dispersion medium, and mixing;
(2) Adding the agent B into the system in the step (1) and mixing; heating and stirring to obtain the final product.
Preferably, the mixing in the step (1) is stirring mixing, wherein the stirring temperature is 40-50 ℃ and the stirring time is 1-5min; preferably 1.5-2min.
Preferably, in the step (2), the heating temperature is 40-50 ℃, and the stirring time is 1-5min; preferably 1.5-2min.
It is still another object of the present invention to provide a method of using a pharmaceutical composition by spraying a surface modifying agent onto the surface of a proppant and adding the agent to a clear or slick water fracturing fluid along with the fibers.
Preferably, the volume to mass ratio of the surface modifying agent to the proppant is 0.2-0.5mL/100g.
It is a further object of the present invention to provide the use of the above pharmaceutical composition for enhancing proppant placement.
Compared with the prior art, the invention has the beneficial effects that:
(1) The technology breaks through the inherent rule of viscosity and speed sand carrying of the traditional fracturing fluid. The modified propping agent can be distributed in clusters in clear water and slick water, high-speed diversion channels which are mutually dispersed and open are formed in the cracks, the sand spreading volume of the cracks in the transverse direction and the longitudinal direction is increased, and the fracturing modification effect of the unconventional oil and gas reservoir is improved. When in site construction, only the surface of the propping agent is required to be sprayed with the modifying agent on line and a small amount of fiber is added, the modified propping agent can be directly connected into the well along with the fiber, modification before construction is not required, and the construction process is simple.
(2) The conventional fracturing fluid viscosity and speed sand carrying process cannot carry propping agent to the far end of the fracture to support the fracture for short, and the fracture supporting volume is limited. According to the invention, the proppant is suspended in clusters in the clean water and the slick water and is not easy to settle by spraying the modified agent and adding the fibers on the surface of the proppant, and compared with the traditional proppant and fiber technology, the fracturing modification effect of a reservoir can be improved by effectively improving the fracture supporting volume and the diversion capability. The technology breaks through the traditional sand carrying concept that the propping agent depends on the viscosity and the speed of the fracturing fluid, and is a creative new concept and technology.
(3) The invention can realize that the suspension rate of the propping agent in the clean water and slick water fracturing fluid can reach 100 percent at normal temperature.
(4) The invention realizes that the 100% suspension rate of the propping agent in the clean water and slick water fracturing fluid can be stabilized for 60 days at normal temperature.
Drawings
FIG. 1 is a graph showing the suspension effect of example 1 fiber+modified silica sand proppant in clear water compared to control fiber+conventional silica sand proppant; wherein the left side is a suspension effect diagram of the control group; the right hand side is the suspension effect of example 1.
Detailed Description
The invention is further described in connection with the following detailed description. The raw materials used in the following embodiments are all commercially available conventional raw materials, wherein the polyamide resin fiber supplier is Shenzhen Tadada technology Co., ltd, model CPF-15-12.
Example 1
The embodiment is composed of the following raw materials: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 3:2:85; the dispersing medium is clear water, the agent A is coco trimethyl ammonium chloride, the agent B is lactic acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) Adding the agent B into the mixture obtained in the step (1), heating for 2min in a water bath kettle at 40 ℃, and continuously stirring for 1.5min by using a glass rod to obtain a propping agent surface modification agent;
(3) Spraying 0.2ml of surface modification agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.1g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s, and the quartz sand suspension rate was calculated.
The control group added the unmodified quartz sand proppant together with 0.1g of polyamide resin fiber into 300ml of clear water, and put the mixture into a 500ml blue cap bottle with scales to shake up and down for 10s, and calculate the suspension rate of the unmodified quartz sand. The results are shown in FIG. 1.
The suspension rate calculation formula is as follows:
w-suspension rate,%;
B 1 -suspending the volume of quartz sand, ml;
B 2 sedimentation quartz sand volume, ml.
Example 2
The embodiment is composed of the following raw materials: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 4:1.5:84.5; the dispersion medium is 50% ethanol water solution, the agent A is dioctadecyl dimethyl ammonium bromide, the agent B is citric acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (A), heating in a water bath kettle at 40 ℃ for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of the modifying agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
Example 3
The embodiment is composed of the following raw materials in parts by volume: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 5:0.5:84.5; the dispersion medium is clear water, the agent A is laurylamine, the agent B is citric acid, and the fiber is polyamide fiber.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (1), and putting the mixture into a water bath kettle at 40 ℃ for heating for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of surface modification agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
Comparative example 1
The comparative example consists of the following raw materials in parts by volume: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 5:0.5:84.5; the dispersion medium is clear water, the agent A is oleic acid, the agent B is citric acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (1), and putting the mixture into a water bath kettle at 40 ℃ for heating for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of the modifying agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
Comparative example 2
The comparative example consists of the following raw materials in parts by volume: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 5:0.5:84.5; the dispersing medium is clear water, the agent A is stearic acid, the agent B is citric acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (1), and putting the mixture into a water bath kettle at 40 ℃ for heating for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of the modifying agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
Comparative example 3
The embodiment is composed of the following raw materials in parts by volume: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 5:0.5:84.5; the dispersing medium is clear water, the agent A is octadecyl trimethyl ammonium chloride, the agent B is citric acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (1), and putting the mixture into a water bath kettle at 40 ℃ for heating for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of the modifying agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
Comparative example 4
The embodiment is composed of the following raw materials in parts by volume: agent A, agent B, dispersion medium and fiber; the volume ratio of the agent A to the agent B to the dispersion medium is 5:0.5:84.5; the dispersion medium is clear water, the agent A is laurylamine, the agent B is acetic acid, and the fibers are polyamide fibers.
The preparation method comprises the following steps:
(1) Adding a dispersing medium into a beaker, adding the agent A into the dispersing medium, and continuously stirring for 1.5min by using a glass rod at the temperature of 40 ℃ to obtain a mixture;
(2) And (3) adding the agent B into the mixture obtained in the step (1), and putting the mixture into a water bath kettle at 40 ℃ for heating for 2min, and continuously stirring for 1.5min to obtain the proppant surface modifying agent.
(3) Spraying 0.2ml of the modifying agent onto the surface of 100g of quartz sand propping agent (40/70 meshes), and adding the modified quartz sand propping agent and 0.15g of polyamide resin fiber into 300ml of clear water; a mixture of fiber + modified quartz sand proppant and clear water is obtained.
The obtained mixture was put into a 500ml blue cap bottle with a scale and shaken up and down for 10s. Quartz sand suspension rate was calculated as in example 1.
The suspension ratios of the proppants manufactured in examples 1-3 and comparative examples 1-4 are shown in Table 1 below.
The proppants manufactured in examples 1-3 and comparative examples 1-2 were left in a clean or slick water fracturing fluid at normal temperature for 60 days, and the suspension rate was again measured according to the method of example 1, with the results shown in table 1 below.
TABLE 1 suspension Rate results for modified Quartz sand proppants
| Examples | Suspension percentage (%) | Suspending rate of 60 days at room temperature (%) |
| Example 1 | 95 | 94 |
| Example 2 | 97 | 97 |
| Example 3 | 100 | 100 |
| Comparative example 1 | 10 | 5 |
| Comparative example 2 | 14 | 10 |
| Comparative example 3 | 83 | 78 |
| Comparative example 4 | 87 | 85 |
The foregoing detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but is to be accorded the full scope of all such equivalents and modifications so as not to depart from the scope of the invention.
Claims (12)
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| CN202211161592.6A CN117736719A (en) | 2022-09-22 | 2022-09-22 | Medicament composition for improving suspension effect of propping agent and application thereof |
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| CN202211161592.6A CN117736719A (en) | 2022-09-22 | 2022-09-22 | Medicament composition for improving suspension effect of propping agent and application thereof |
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