CN115029114A - Water plugging fracturing crack diverting agent suitable for high-water-content oil reservoir and preparation method thereof - Google Patents
Water plugging fracturing crack diverting agent suitable for high-water-content oil reservoir and preparation method thereof Download PDFInfo
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Abstract
The invention provides a water plugging fracturing fracture diverting agent suitable for a high-water-content oil reservoir and a preparation method thereof, wherein the trial diverting agent comprises the following components in percentage by mass: 20-50% of water-absorbent resin particles; 30-40% of oil-soluble permeable porous material particles; the balance of inorganic reinforcing agent. The water-plugging fracturing fracture diverting agent suitable for the high-water-content oil reservoir can realize dual functions of plugging an original fracture channel and fracturing diverting, and can reduce the integral permeability after sealing after water absorption expansion; the strength is high after plugging, and crack steering can be realized; in addition, the oil-soluble permeable porous material particles of the original cracks can be dissolved with oil to form production channels, residual oil in the original crack channels is excavated, and the single-well yield is improved.
Description
Technical Field
The invention belongs to the technical field of oilfield flooding development, and particularly relates to a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir and a preparation method thereof.
Background
After an oil field enters the middle and later stages of water injection development, the oil reservoir production adopting fracturing operation has the characteristics of quick water breakthrough of the oil well, quick yield decrease and the like, and particularly, after the water content is quickly increased due to the crack communication of an oil-water well, the water content is suddenly flooded, and the final recovery ratio is low due to the fact that the water content reaches more than 80%.
At present, one of the main means for solving the problems is steering fracturing, the conventional steering fracturing is to inject a fracture steering agent in the fracturing process, utilize the plasticity of a temporary plugging agent and the rigidity of a propping agent, realize bridge plugging in a fracture by controlling hydraulic fracturing construction parameters, improve the net pressure of the hydraulic fracturing fracture and force the fracture to steer. This type of diverting fracturing, while creating new fractures, does not achieve selective plugging of the original fractures, and there is a water cut that rises again. The other type of the diversion fracturing is to inject cement blocking agents to block the original cracks completely and then temporarily block the cracks to form new cracks.
For example, the patent of publication No. CN103484088A discloses an oil-soluble water-viscous type water-plugging fracturing propping agent and a preparation method thereof, wherein the oil-soluble water-viscous type water-plugging fracturing propping agent consists of aggregate particles and an outer coating, the outer coating is coated on the outer circumference of the aggregate particles, the aggregate particles are quartz sand or ceramsite, and the outer coating is modified reinforced polyhydroxyalkanoate. The fracturing fluid can be quickly dissolved in crude oil and completely consolidated in formation water, and is used for the field of low-permeability and high-water-saturation reservoir fracturing.
Patent publication No. CN201810684091 discloses a water-plugging fracturing tectorial membrane proppant for a bottom water oil reservoir and a preparation method thereof, wherein the proppant comprises aggregate, an oil-soluble sealing agent, a slow-release curing agent, a resin binder and a curing agent. The fracturing fluid is suitable for high water plugging fracturing of a bottom water reservoir transformation control seam, can be contacted with reservoir rocks for a long time, adopts an oil-soluble sealing material to coat a propping agent, is solidified and molded by a coating layer after being pressed under the temperature and the pressure of the reservoir, is stable when meeting water, and is dissolved when meeting oil, thereby achieving the purpose of plugging a bottom water transformation production layer, taking the basic function of supporting a diversion fracture by using a conventional propping agent into consideration, and simultaneously taking the effect of water plugging and sealing into consideration.
The chemical selective plugging of the patent literature only adopts a surface coating of a rigid material, so that the coating is worn and consumed, and the plugging performance is reduced; permeability exists after plugging, and plugging capability is limited; the permeation channels are gaps among the particles of the film-coated material, and the permeability is reduced under the crushing action of the ground stress.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a water-plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir, which can thoroughly block an original fracture to realize diverting fracturing, can restart the re-production capacity of the original fracture, and can excavate residual oil existing in a matrix near the original fracture.
The invention also aims to provide a preparation method of the water plugging fracturing fracture diverting agent for the high-water-cut oil reservoir.
The invention is realized by the following technical scheme:
the water plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir comprises the following components in percentage by mass: 20-50% of water-absorbent resin particles; 30-40% of oil-soluble permeable porous material particles; the balance of inorganic reinforcing agent.
As a further preferable scheme, the water-absorbent resin particles are one or a combination of more of modified starch super-absorbent resin particles, polyacrylic acid super-absorbent expanded resin particles and vinyl acetate modified water-absorbent expanded resin particles.
As a further preferable mode, the particle diameter of the water absorbent resin particle is 0.3 to 2.0 mm.
Further, the oil-soluble permeable porous material particles are composed of the following components in percentage by mass: 20-40% of oil-soluble resin and 60-80% of porous material particles containing interconnected pores.
Preferably, the oil-soluble resin is one or a combination of several of p-tert-butyl phenol formaldehyde resin, dicyclopentadiene resin and petroleum resin.
As a further preferable scheme, the porous material particles containing interconnected pores are one or more of alumina foamed ceramics, silicon carbide foamed ceramics, zirconia foamed ceramics, foamed iron, foamed copper and foamed titanium.
As a further preferable scheme, the particle size distribution interval of the porous material particles containing the communicating pores is as follows: 0.4-2.5 mm.
As a further preferable scheme, the inorganic reinforcing agent is one or a mixture of two of nano calcium carbonate and nano silicon dioxide.
A preparation method of a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir comprises the following steps:
s1, preparing oil-soluble permeable porous material particles;
s2, adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the inorganic reinforcing agent into a sand mixer in proportion, and uniformly stirring at a rotating speed of 100-150 r/min to obtain the water-plugging fracturing crack diverting agent suitable for the high-water-cut oil reservoir.
Specifically, the specific method for preparing the oil-soluble permeable porous material particles by the S2 method comprises the following steps: heating a reaction kettle to 120 ℃, adding 20-40% by mass of oil-soluble resin into the reaction kettle, heating to melt, adding 60-80% by mass of solid material containing intercommunicating pores into the reaction kettle, stirring at the rotating speed of 40-60 r/min for 30min, sieving the obtained solid material with a 0.4-2.5mm screen mesh, and cooling to room temperature to obtain oil-soluble permeable porous material particles.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the water-absorbent resin has the water-absorbing expansion effect, realizes expansion under the condition of higher water content in the original crack, reduces the integral sealing permeability, and increases the bonding capacity with the crack surface.
2. The oil-soluble permeable porous material particles have rigidity and can enter crack channels; the oil-soluble resin in the oil-soluble permeable porous material particles has a selective plugging effect, and original channels of the oil-soluble permeable porous material particles can be dissolved to provide permeable channels when oil is extracted from an oil well and produced liquid contains oil.
3. The inorganic reinforcing agent adopts a nano-scale material, and can be filled in micron and nano-sized gaps between water-absorbent resin particles and oil-soluble permeable porous material particles.
4. The water-plugging fracturing fracture diverting agent for the high-water-content oil reservoir provided by the invention is used for plugging an original fracture channel by bridging and expanding actions to realize diverting to form a new fracture, and meanwhile, the oil-soluble resin in the filled porous material is dissolved when meeting oil and is stable when meeting water, so that a permeable channel is provided, and selective plugging is realized.
5. The water-plugging fracturing crack diverter for the high-water-cut oil reservoir can completely plug an original crack channel at the initial stage, and meanwhile, if residual oil exists in the original crack channel, the oil-soluble resin in the filled oil-soluble permeable porous material particles can be dissolved in oil in the later production process, and the oil-soluble resin can provide a permeable channel by virtue of the stable property of the oil-soluble resin when meeting water, so that the residual oil existing in a matrix near the original crack can be excavated.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear and clear, and to implement the technical means according to the content of the description, the following description is made of the preferred embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below.
Fig. 1 is a schematic diagram of a pressure-bearing plugging experiment result.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in the routine experiments. The preparation methods mentioned in the invention are all conventional methods unless specified otherwise; all starting materials mentioned in the following examples were obtained from published commercial sources unless otherwise specified.
The invention provides a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir, which comprises the following components in percentage by mass: 20-50% of water-absorbent resin particles; 30-40% of oil-soluble permeable porous material particles; the balance of inorganic reinforcing agent.
As a further preferable scheme, the water-absorbent resin particles are one or a combination of more of modified starch super-absorbent resin particles, polyacrylic acid super-absorbent expanded resin particles and vinyl acetate modified water-absorbent expanded resin particles. Preferably, the water absorbent resin particles have a particle diameter of 0.3 to 2.0 mm. The water-absorbent resin has the function of water absorption and expansion, realizes expansion under the condition of higher water content in the original crack, reduces the integral sealing permeability, and increases the bonding capacity with the crack surface.
Further, the oil-soluble permeable porous material particles are composed of the following components in percentage by mass: 20-40% of oil-soluble resin and 60-80% of porous material particles containing interconnected pores.
Preferably, the oil-soluble resin is one or a combination of several of p-tert-butyl phenol formaldehyde resin, dicyclopentadiene resin and petroleum resin.
As a further preferable scheme, the porous material particles containing interconnected pores are one or more of alumina ceramic foam, silicon carbide ceramic foam, zirconia ceramic foam, iron foam, copper foam and titanium foam.
As a further preferable scheme, the particle size distribution interval of the porous material particles containing the communicating pores is as follows: 0.4-2.5 mm.
The oil-soluble permeable porous material particles have rigidity and can enter crack channels; the oil-soluble resin in the oil-soluble permeable porous material particles has the function of selective plugging, and can realize dissolution of original channels of the oil-soluble permeable porous material particles when an oil well is pumped and oil is contained in produced liquid, so that a permeation channel is provided, and selective plugging is realized.
As a further preferable scheme, the inorganic reinforcing agent is one or a mixture of two of nano calcium carbonate and nano silicon dioxide. The inorganic reinforcing agent adopts a nano-scale material, and can be filled in micron and nano-sized gaps among water-absorbent resin particles and oil-soluble permeable porous material particles.
The invention also provides a preparation method of the water plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir, which comprises the following steps:
s1, preparing oil-soluble permeable porous material particles;
s2, adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the inorganic reinforcing agent into a sand mixer in proportion, and uniformly stirring at a rotating speed of 100-150 r/min to obtain the water-plugging fracturing fracture diverting agent suitable for the high-water-content oil reservoir.
As a further preferable technical scheme, the preparation method of the oil-soluble permeable porous material particles comprises the following steps: heating a reaction kettle to 120 ℃, adding 20-40% by mass of oil-soluble resin into the reaction kettle, heating to melt, adding 60-80% by mass of solid material containing intercommunicating pores into the reaction kettle, stirring at the rotating speed of 40-60 r/min for 30min, sieving the obtained solid material with a 0.4-2.5mm screen, and cooling to room temperature to obtain oil-soluble permeable porous material particles.
The invention adopts the diverting agent prepared by water-absorbent resin particles, oil-soluble permeable porous material particles and an inorganic reinforcing agent, the oil-soluble permeable porous material particles are used as a framework, the water-absorbent resin absorbs water to expand and fill the wall surface of a crack, and the inorganic reinforcing agent blocks the gap with the size of nanometer and micron. The original crack channel can be completely blocked at the initial stage, and according to the dynamic state in the original crack fluid production process at the later stage, the original channel of the porous material particles with oil solubility and permeability can be dissolved after encountering crude oil to form a production channel, so that the residual oil in the original crack channel is excavated, and the yield of a single well is improved.
Example 1:
the embodiment provides a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir, which comprises the following components in percentage by mass: 50% of water-absorbent resin particles, 40% of oil-soluble permeable porous material particles and 10% of inorganic reinforcing agent.
Specifically, the water absorbent resin particles are composed of the following components in percentage by mass: 60% of modified starch super absorbent resin particles and 40% of vinyl acetate modified water-absorbent expanded resin particles.
Specifically, the oil-soluble permeable porous material particles are composed of 40% by mass of an oil-soluble resin and 60% by mass of porous material particles containing interconnected pores. Specifically, the oil-soluble resin comprises the following components in percentage by mass: 70% of p-tert-butyl phenol formaldehyde resin and 30% of dicyclopentadiene resin. The porous material particles containing the interconnected pores are alumina foamed ceramics.
Specifically, the inorganic reinforcing agent is nano silicon dioxide.
The preparation method comprises the following steps:
s1, heating a reaction kettle, sequentially adding p-tert-butyl phenol formaldehyde resin and dicyclopentadiene resin into the reaction kettle according to a proportion, heating to melt, adding each material, stirring for 20min to fully melt, mixing, stirring for 20min after all the materials are added, then adding alumina foamed ceramic according to a proportion, stirring for 30min, sieving the obtained solid material, and cooling to room temperature to produce oil-soluble permeable porous material particles;
s2, proportionally adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the inorganic reinforcing agent into a sand mixer, uniformly stirring, and bagging.
Example 2
The embodiment provides a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir, which comprises the following components in percentage by mass: 30% of water-absorbent resin particles, 30% of oil-soluble permeable porous material particles and 40% of inorganic reinforcing agent.
Specifically, the water absorbent resin particles are composed of the following components in percentage by mass: 54% of polyacrylic acid high water-absorption expanded resin particles and 46% of vinyl acetate modified water-absorption expanded resin particles.
Specifically, the oil-soluble permeable porous material particles are composed of 28% by mass of an oil-soluble resin and 72% by mass of porous material particles containing interconnected pores. Specifically, the oil-soluble resin comprises the following components in percentage by mass: 40% of p-tert-butyl phenol formaldehyde resin, 25% of dicyclopentadiene resin and the balance of petroleum resin. The porous material particles containing the interconnected pores are titanium foam.
Specifically, the inorganic reinforcing agent comprises the following components in percentage by mass: 40% of nano silicon dioxide and 60% of nano calcium carbonate.
The preparation method comprises the following steps:
s1, heating a reaction kettle, sequentially adding p-tert-butylphenol formaldehyde resin, dicyclopentadiene resin and petroleum resin into the reaction kettle according to a proportion, heating to be molten, adding each material, stirring for 20min to fully melt, mixing, adding all the materials, stirring for 20min, adding foamed titanium into the materials according to the proportion, stirring for 30min, sieving the obtained solid material, and cooling to room temperature to produce oil-soluble permeable porous material particles;
s2, adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the inorganic reinforcing agent into a sand mixer in proportion, uniformly stirring and bagging.
Example 3
The embodiment provides a water plugging fracturing fracture diverting agent suitable for a high-water-cut oil reservoir, which comprises the following components in percentage by mass: 50% of water-absorbent resin particles, 33% of oil-soluble permeable porous material particles and 17% of inorganic reinforcing agent.
Specifically, the water absorbent resin particles are composed of the following components in percentage by mass: 22 percent of modified starch super absorbent resin particles, 52 percent of polyacrylic acid super absorbent expanded resin particles and the balance of vinyl acetate modified water absorbent expanded resin particles.
Specifically, the oil-soluble permeable porous material particles are composed of 23% by mass of an oil-soluble resin and 77% by mass of porous material particles containing interconnected pores. Specifically, the oil-soluble resin comprises the following components in percentage by mass: 54% of p-tert-butyl phenol formaldehyde resin, 31% of dicyclopentadiene resin and the balance of petroleum resin. The porous material particles containing the interconnected pores consist of the following components in percentage by mass: 26% of silicon carbide foam ceramic and 73% of foam copper.
Specifically, the inorganic reinforcing agent comprises the following components in percentage by mass: 72 percent of nano silicon dioxide and 28 percent of nano calcium carbonate.
The preparation method comprises the following steps:
s1, heating a reaction kettle, sequentially adding p-tert-butylphenol formaldehyde resin, dicyclopentadiene resin and petroleum resin into the reaction kettle according to a proportion, heating to be molten, adding each material, stirring for 20min to fully melt the materials, then mixing for 20min after all the materials are added, then adding silicon carbide foamed ceramic and foamed copper into the materials according to the proportion, stirring for 30min, sieving a solid material, and cooling to room temperature to produce oil-soluble permeable porous material particles;
s2, adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the nano inorganic reinforcing agent into a sand mixer in proportion, uniformly stirring and bagging.
Example 4
For the water plugging fracturing crack diverter product prepared in example 3, a pressure-bearing plugging experiment and a sand-filled pipe displacement experiment are carried out in a high-temperature high-pressure fluid loss tester.
Pressure-bearing plugging experiment:
and selecting a sealable pressurized fluid loss barrel, sealing a 2mm pore slot with a plug, filling a steering agent and fracturing fluid into the fluid loss barrel, heating the fluid loss barrel to 70 ℃ under the stirring condition, controlling the pressure in the fluid loss barrel to be continuously increased from 0 to 40MPa, and observing and recording the fluid loss condition.
As shown in figure 1, in a plugging experiment of the diverting agent for water plugging and fracturing cracks, the filtration loss increases with the increase of pressure and then gradually stabilizes, and the change of the filtration loss is not large when the pressure increases, which shows that the diverting agent has good plugging performance under the pressure of 40MPa and the temperature of 70 ℃.
Sand-packed pipe displacement experiment:
the sand filling pipe 1 and the sand filling pipe 2 are filled with quartz sand with different mesh combinations of 40-80 meshes, 80-100 meshes, 100 meshes 150 meshes and 200 meshes 300 meshes, wherein the sand filling pipe 1 is made of quartz sand, and the sand filling pipe 2 is made of the same combination of quartz sand and a diverter with the thickness of 5cm (located in the middle of the sand filling pipe).
Firstly, stratum water is adopted to displace a sand filling pipe 1 and a sand filling pipe 2, and the measured permeability rates of the sand filling pipe 1 and the sand filling pipe 2 are respectively k 1 And k 2 Then, the sand filling pipe 2 is kept stand for 48 hours for aging at the simulated formation temperature of 70 ℃, and the permeability k is calculated 3 (ii) a Then, the sand filling pipe 2 is displaced by adopting kerosene, the simulated formation temperature is kept still for 48 hours for aging at 80 ℃, and the permeability k is tested and calculated 4 Continuing to age for 240h, testing and calculating the permeability k 5 The calculation results are shown in table 1 below.
Table 1 displacement experiment of sand-packed pipe
| K 1 | K 2 | K 3 | K 4 | K 5 |
| 311.1 | 1.3 | 0.9 | 72.7 | 124.2 |
As shown in Table 1, permeability K was measured for simulated formation water in sand pack pipe 2 2 Much less than the permeability K measured in the sand-packed pipe 1 1 The plugging effect of the diverting agent is good; the permeability K is measured after simulating the stratum water aging in the sand-filled pipe 2 3 Less than the permeability K measured before non-aging 2 This is because voids caused by the expansion of the water absorbent resin decrease with time; the permeability K of the kerosene after 48h and 240h of displacement aging is measured in the sand-packed pipe 2 4 And K 5 It is shown that the oil-soluble permeable porous material particles in the diverting agent can be released to some extent in the oil phase and the permeability is partially restored with time.
In conclusion, the water plugging fracturing fracture diverter applicable to the high-water-cut oil reservoir can completely plug original fracture channels in the initial stage, and according to the dynamic state of the original fracture fluid in the later stage in the production process, the original channels of the oil-soluble permeable porous material particles can be dissolved to form production channels after encountering crude oil, so that residual oil existing in a matrix near the original fractures is excavated, and the development effect is improved.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. The water plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir is characterized by comprising the following components in percentage by mass: 20-50% of water-absorbent resin particles; 30-40% of oil-soluble permeable porous material particles; the balance of inorganic reinforcing agent.
2. The water-plugging fracturing fracture diverter suitable for the high-water-cut oil reservoir as claimed in claim 1, wherein: the water-absorbing resin particles are one or a combination of more of modified starch super-absorbent resin particles, polyacrylic acid super-absorbent expanded resin particles and vinyl acetate modified water-absorbent expanded resin particles.
3. The water-plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir as claimed in claim 1, is characterized in that: the particle diameter of the water-absorbent resin particles is 0.3-2.0 mm.
4. The water-plugging fracturing fracture diverter suitable for the high-water-cut oil reservoir is characterized in that the oil-soluble permeable porous material particles are composed of the following components in percentage by mass: 20-40% of oil-soluble resin and 60-80% of porous material particles containing interconnected pores.
5. The water-plugging fracturing fracture diverter suitable for the high-water-cut oil reservoir as claimed in claim 4, wherein: the oil-soluble resin is one or a combination of several of p-tert-butylphenol formaldehyde resin, dicyclopentadiene resin and petroleum resin.
6. The water-plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir as claimed in claim 4, characterized in that: the porous material particles containing the interconnected pores are one or more of alumina foamed ceramics, silicon carbide foamed ceramics, zirconia foamed ceramics, foamed iron, foamed copper and foamed titanium.
7. The water-plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir as claimed in claim 6, wherein the particle size distribution interval of the porous material particles containing the interconnected pores is as follows: 0.4-2.5 mm.
8. The water shutoff fracturing fracture diverting agent suitable for high-water-cut oil reservoirs is characterized in that the inorganic reinforcing agent is one or a mixture of nano calcium carbonate and nano silica.
9. The preparation method of the water plugging fracturing fracture diverting agent suitable for the high-water-cut oil reservoir is characterized by comprising the following steps of:
s1, preparing oil-soluble permeable porous material particles;
s2, adding the water-absorbent resin particles, the oil-soluble permeable porous material particles and the inorganic reinforcing agent into a sand mixer in proportion, and uniformly stirring at a rotating speed of 100-150 r/min to obtain the water-plugging fracturing fracture diverting agent suitable for the high-water-content oil reservoir.
10. The preparation method of the water plugging fracturing fracture diverter suitable for the high water-cut oil reservoir as claimed in claim 9, wherein the specific method for preparing the oil-soluble permeable porous material particles by S2 is as follows: heating a reaction kettle to 120 ℃, adding 20-40% by mass of oil-soluble resin into the reaction kettle, heating to melt, adding 60-80% by mass of solid material containing intercommunicating pores into the reaction kettle, stirring at the rotating speed of 40-60 r/min for 30min, sieving the obtained solid material with a 0.4-2.5mm screen, and cooling to room temperature to obtain oil-soluble permeable porous material particles.
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