CN115745476A - Porous cement polymer composite material, preparation method and application thereof in enhancing permeability of natural gas hydrate reservoir - Google Patents
Porous cement polymer composite material, preparation method and application thereof in enhancing permeability of natural gas hydrate reservoir Download PDFInfo
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Abstract
The invention discloses a porous cement polymer composite material, a preparation method and application thereof in enhancing and increasing permeability of a natural gas hydrate reservoir, wherein a foaming agent is not adopted, fine recycled concrete with uniform particle size is taken as aggregate, porous fly ash and cement are taken as cementing agents, bamboo fiber or particles are taken as auxiliary materials, a certain amount of cationic polyacrylamide and water are added to be mixed to prepare porous cement polymer composite slurry, and the cement polymer composite material with good permeability and strength prepared after solidification is used for enhancing the cementing strength of the natural gas hydrate reservoir to form an artificial well wall which can be used as a sand blocking medium, and the sand blocking and improving mode is adopted to relieve sand production and prolong the sand production time, improve the permeability of the cement polymer composite material and prolong the sand prevention time of the cement polymer composite slurry.
Description
The technical field is as follows:
the invention relates to the technical field of natural gas hydrate exploitation, in particular to a porous cement polymer composite material, a preparation method and application thereof in enhancing permeability of a natural gas hydrate reservoir stratum.
Background art:
the natural gas hydrate is cage-shaped crystal formed by low-grade hydrocarbon and water under the conditions of high pressure and low temperature, and is mainly distributed in deep sea land slope areas with the water depth of more than 300m and land permafrost zones, wherein the marine natural gas hydrate resource amount accounts for about 97% of the global total resource amount. The carbon content of gas hydrate deposits that have been explored on a global scale is about twice that of existing fossil energy sources. The natural gas hydrate is considered to be the most potential continuous energy source after shale gas, coal bed gas and dense gas due to wide distribution, large reserve, cleanness and the like, and the natural gas hydrate gets the attention and the attention of governments, enterprises and scholars of various countries and becomes the top point of future energy strategy and the leading edge of technological innovation in the strive of various countries in the world.
The marine natural gas hydrate layer generally exists in soft unconsolidated or weakly consolidated sediments with the water depth of more than 800m and the depth of 400m below the sea bottom, the burial is shallow, the sediment framework is weakly consolidated or unconsolidated argillaceous silty sand, and the argillaceous content is up to more than 40%. The typical natural gas hydrate in China mainly exists in muddy silt sediments in a dispersing or weak cementing mode, the natural gas hydrate or cement, reservoir framework particles and the average permeability of a reservoir are only a few millidarcies. The reservoir distribution is composed of a hydrate layer, a mixed layer and a gaseous hydrocarbon layer from top to bottom in sequence, and the physical parameters of the reservoir are shown in table 1.
TABLE 1 Natural gas hydrate reservoir physical parameters
Such hypotonic soft reservoir characteristics present a significant challenge to the development of natural gas hydrates. The natural gas hydrate exploitation process is a coupled complex process for changing the thermodynamic condition of a stable zone of the natural gas hydrate, decomposing solid hydrates, generating liquid water migration and producing natural gas. The technical methods for natural gas hydrate development that have been proposed so far mainly include: depressurization, heating, and chemical potential difference driving (including injection and CO) 2 Displacement, etc.) and solid state fluidization, etc., see table 2.
TABLE 2
However, hydrate production currently faces great distances from commercialization. In the process of mining, hydrate phase change causes changes of mechanical properties and porosity of a reservoir, in-situ formation stress is redistributed, and a series of geological risk problems such as instability of a well wall, sand production of a well hole, formation settlement, landslide and the like are easily induced. Wherein, sand production is one of bottleneck problems which restrict the safe and high-efficiency exploitation of hydrate.
The cement strength of the muddy silt can be further reduced by the decomposition and generation of hydrates in the natural gas hydrate development process, and the muddy sand is produced along with the produced liquid (mixture of gas and water) in the production process. The sand production can increase the sand setting amount in the shaft, cause the damage of underground equipment such as an electric submersible pump and the like, greatly increase the production period and even stop the production, and the sand-liquid mixture moved upwards is also subjected to related treatment; and the sand production can also cause the structural damage and the strength reduction of the stratum around the well, so that the ground stress is redistributed, and the risk of the occurrence of geological disasters is increased. Therefore, how to prevent the sand production of the natural gas hydrate reservoir stratum, effectively increase the strength of the reservoir stratum, improve the permeability of the reservoir stratum and improve the gas production efficiency is a core problem to be solved for realizing the industrialization of the natural gas hydrate.
Aiming at two key problems of extremely low permeability and serious sand production caused by muddy silt in a hydrate reservoir, chinese scholars give suggestions mainly based on hydraulic fracturing and assisted with near-well reservoir transformation. But hydraulic fracturing cannot solve the problem that the mechanical strength of a reservoir is not enough to produce sand seriously during hydrate exploitation. Sand production is one of the key factors restricting the efficient and safe exploitation of hydrates. The measures proposed at present are basically based on the conventional sand control method of loose sandstone oil and gas reservoirs. The main conventional sand control methods at present include a mechanical sand control method combining gravel packing and various screen pipes, a chemical sand control method, and a composite sand control method combining chemical sand control and mechanical sand control. The chemical sand control method is mainly divided into an artificial cemented formation method and an artificial well wall method. The artificial cementing method is to cement loose sand grains in the loose sandstone stratum at the contact points of the sand grains by adopting a cementing agent so as to achieve the aim of preventing sand and enhance the mechanical strength of the loose sandstone stratum. The chemical sand consolidation agent of the conventional loose sandstone oil-gas reservoir is formed by cementing sand grains by using inorganic cementing agents such as silicic acid, calcium silicate and the like or organic cementing agents such as phenolic resin, urea resin, epoxy resin, polyurethane and the like, so that the cementing strength is improved. The artificial well wall method is to extrude resin coated sand, cement mortar and the like into the vacancy of the well hole to form an artificial well wall with certain permeability, so that the artificial well wall can be used for cementing a stratum and forming a stratum sand blocking medium for sand prevention. The chemical sand control method of the conventional oil and gas reservoir has better sand control effect on fine silt than the mechanical sand control method, but can damage the permeability of a reservoir stratum, and meanwhile, the organic sand consolidation agent is easy to age and has shorter effective period.
The sea area hydrate reservoir is mainly formed by argillaceous fine silt, the median particle size is 10-16 mu m, the particle size is thinner than that of a conventional loose sandstone oil-gas reservoir, the argillaceous content reaches 25% -50%, the sediment is weakly cemented or unconsolidated, and sand production is more serious after phase change induction in the mining process. The characteristic of weak cementation of conventional high-argillaceous fine silt causes the difficulty of the sand prevention of a hydrate reservoir to be higher than that of the conventional loose sandstone oil and gas reservoir, and higher requirements are put forward on a sand prevention medium and a sand prevention process. At present, the research on the problem of sand prevention of a natural gas hydrate reservoir is still in a starting stage, and mainly aims at the research on a sand production mechanism, sand migration rules of different sand blocking media and blockage. 2020. Aiming at the low-permeability argillaceous silt hydrate reservoir stratum, the traditional idea of 'blocking and preventing' is changed into 'fixing and improving', namely, the permeability of the reservoir stratum is improved while the hydrate reservoir stratum is reinforced.
Grouting technology is commonly adopted in underground engineering construction to reinforce weak strata and block underground water. The grouting materials in the grouting technology are classified into granular materials and organic chemical materials. The granular materials mainly comprise cement paste, cement-water glass double-slurry, superfine cement paste, clay paste and the like. The grouting material has the advantages of low cost, wide material source, simple slurry preparation, simple grouting process and the like, and is widely used by underground engineering. The organic chemical materials mainly comprise polyacrylamides, polyurethanes, polyacrylates, epoxy resins and the like, and the materials have low viscosity and are easy to be injected into fine cracks or pores, but have high cost, complex process and influence on the environment, so that the application is limited to a certain extent. The grout infiltrates and diffuses in the stratum under a certain pressure condition or reaches the fracture pressure to perform fracture diffusion or fill in the fracture, but the water permeability coefficient of the underground rock-soil body can be reduced after the current grouting grout is solidified.
The prepared porous polyurethane slurry can be rapidly cured to form a stable porous supporting network framework with high flow conductivity and high strength in the temperature and pressure environment of the seabed hydrate reservoir after the split diffusion is carried out on the prepared porous polyurethane slurry under the stratum rupture pressure, and can have stronger cementing effect with the sediment, so that the mechanical strength of the reservoir is improved, the stability of the reservoir is improved, the permeability of the reservoir is improved, the double-increase modification-enhanced permeation of the natural gas hydrate reservoir is realized, and the safe and efficient development of the natural gas hydrate is facilitated.
The domestic scholars are inspired to develop foam water glass slurry. The water glass slurry is used as a main agent, and external agents such as a foaming agent, a foam stabilizer and the like are added to adjust the stability and the property to a certain extent, so that the water glass slurry can be cemented with a reservoir to form a porous structure, and the purpose of enhancing the stable permeability is achieved. The foam concrete is a cement light material with porous inner parts, which is formed by fully stirring a solution prepared from a foaming agent and water with cement slurry, pouring and molding after uniformly stirring and maintaining in a physical foaming way. Because the cement lightweight material introduces a large amount of micro-foam in the preparation process, the air bubbles are uniformly distributed in the cement slurry, so that the volume weight of the cement lightweight material is far lower than that of common concrete. The hardened porous cement/concrete contains a large number of air holes inside, is applied to the projects of soft soil foundation backfill, cavity filling, tunnel collapse treatment, water leakage plugging and the like, and adopts the light concrete with small self-weight, good fluidity before consolidation, good consolidation effect after consolidation but small consolidation strength.
Although the slurry with high porosity and high permeability is injected into the stratum through 'solid-liquid modification', part of fine powder silt of the reservoir can be solidified and the permeability of the reservoir can be increased after the slurry permeates the stratum with a certain radius, a certain channel is provided for produced gas and liquid, and the sand production of the hydrate reservoir can be relieved to a certain degree. However, in the production process of the hydrate, the fine powder silt still can be produced along with the produced gas-liquid mixture under the production pressure difference.
The invention content is as follows:
the invention aims to provide a porous cement polymer composite material, a preparation method and application thereof in enhancing and permeability increasing of a natural gas hydrate reservoir stratum, wherein a foaming agent is not adopted, fine recycled concrete with uniform particle size is used as an aggregate, porous fly ash and cement are used as a cementing agent, bamboo fiber or particles are used as auxiliary materials, a certain amount of cationic polyacrylamide and water are added to be mixed to prepare porous cement polymer composite slurry, the porous cement polymer composite slurry is extruded into a hole gap of a well and permeates the natural gas hydrate reservoir stratum with a certain radius under certain pressure, the cement polymer composite material with good permeability and strength is prepared after solidification and used for enhancing the bonding strength of the natural gas hydrate reservoir stratum to form an artificial well wall, the artificial well wall can be used as a sand blocking medium, sand production is relieved and the production time is prolonged by adopting a blocking and improving mode, the permeability is improved, and the sand prevention time is prolonged.
A porous cement polymer composite material is prepared by taking fine recycled concrete with uniform grain diameter of 1-3mm as aggregate, porous fly ash and cement as cementing agent, bamboo fiber particles as auxiliary materials, and cationic polyacrylamide and water; according to the total mass percentage of 100%, the mass fraction of the bamboo fiber particles is 7% -8%, the mass fraction of the cationic polyacrylamide is 1%, the aggregate and the cementing agent are collectively called as ash, the water-cement ratio is (0.3-0.6): 1, and the mass ratio of the aggregate to the cementing agent is (3) ((1-1.5)).
Preferably, the mass fraction of the bamboo fiber particles is 8%, the mass fraction of the cationic polyacrylamide is 1%, and the water-cement ratio is 0.5.
The preparation method of the porous cement polymer composite material comprises the following steps: stirring the aggregate and the cementing agent for 3-8 minutes, adding the bamboo fiber particles, the cationic polyacrylamide and water, stirring and mixing, filling the mixture into a mold, curing and curing, and demolding to obtain the high-performance bamboo fiber reinforced polypropylene composite material.
The invention also protects the application of the porous cement polymer composite material in enhancing the permeability of a natural gas hydrate reservoir, and the application comprises the following steps: stirring the aggregate and the cementing agent, adding the bamboo fiber particles, the cationic polyacrylamide and water, stirring and mixing to obtain slurry, extruding the slurry into a hole and penetrating a natural gas hydrate reservoir stratum with a certain radius under certain pressure, and curing to prepare the cement polymer composite material with good permeability and strength, so that the cementing strength of the natural gas hydrate reservoir stratum is enhanced, and the permeability of the cement polymer composite material is improved to form the artificial borehole wall.
The strength of the slurry after being injected into a natural gas hydrate reservoir for cementation is greatly increased, and the prepared cement polymer composite material has uniform particle size, uniform size of formed pores and good permeability. The added bamboo fiber polymer also increases the permeability to the reservoir cement. The cationic polyacrylamide can flocculate superfine silt, and the formed flocculate is loose and has high permeability, so that the gas-liquid flow is not influenced, and the prepared cement polymer composite material with good permeability and strength is used for enhancing the bonding strength of a natural gas hydrate reservoir stratum, improving the permeability and prolonging the sand prevention time.
The invention has the following beneficial effects:
1) Unlike porous polyurethane, water glass and concrete, which are foamed with foaming agent to prepare porous slurry, the present invention prepares composite porous cement polymer slurry with foamed porous polyurethane, water glass and concrete, fine regenerated concrete of homogeneous grain size as aggregate, porous flyash and cement as cementing agent, bamboo fiber or grain as supplementary material, certain amount of cationic polyacrylamide and water, and the composite cement polymer slurry is cured to prepare composite cement polymer material with excellent permeability and strength.
2) The cement polymer composite material prepared by the invention has uniform grain diameter, uniform pore size and good permeability. The added bamboo fiber polymer also increases the permeability to the reservoir cement. The cationic polyacrylamide flocculates the ultrafine silt sand, and the formed flocculate is loose and has high permeability, so that the gas-liquid flow is not influenced, and the prepared cement polymer composite material with good permeability and strength is used for enhancing the bonding strength of a natural gas hydrate reservoir stratum, improving the permeability of the natural gas hydrate reservoir stratum and prolonging the sand prevention time of the natural gas hydrate reservoir stratum.
Description of the drawings:
FIG. 1 is a schematic diagram of the medium sand blocking test principle of the present invention.
The specific implementation mode is as follows:
the following is a further description of the invention and is not intended to be limiting.
Sample preparation example 1: preparation of porous cement polymer composite slurry:
sieving fine recycled concrete aggregate with the particle size of about 2mm by using a sieve with 8-10 meshes, taking 42.3kg of fine recycled concrete, stirring the fine recycled concrete aggregate, 4.23kg of porous fly ash and 14.108kg of cement for 5 minutes by using a single horizontal shaft, adding 8kg of bamboo fiber particles, 1kg of cationic polyacrylamide and 30.33kg of water, fully dissolving the bamboo fiber particles, and stirring for 5 minutes to prepare the porous cement polymer composite slurry.
Comparative example 1:
reference sample preparation example 1, except that fly ash, bamboo fiber particles and cationic polyacrylamide were not added in the preparation of the porous cement polymer composite slurry.
Comparative example 2:
reference sample preparation example 1 except that the porous cement polymer composite slurry was prepared without adding bamboo fiber particles and cationic polyacrylamide.
Comparative example 3:
reference sample preparation example 1, except that the cationic polyacrylamide was not added in the preparation of the porous cement polymer composite slurry.
The reservoir simulation rock sample is obtained by artificial sampling according to the sea area seabed sand sample granularity distribution curve and the argillaceous content. The reservoir simulation rock samples are respectively cemented by 20 meshes, 40 meshes, 100 meshes, 200 meshes, 500 meshes, 1000 meshes of montmorillonite and illite, and quartz with clay. The argillaceous content is 40.2%, the median of the sample particle size is 11 μm, the sample is high-mud fine siltstone, and the particle size and the physical property are basically consistent with the physical property of unconsolidated sediments of a reservoir.
Examples of Performance testing
1. Determination of the coagulation time
The slurry materials of the sample preparation example 1 and the comparative examples 1 to 3 were subjected to viscosity measurement by a viscometer method, and the time when the slurry viscosity reached 100cp, at which the slurry substantially lost fluidity, was the primary gel time. See table 3 for results.
2. Preparation of rock samples
The mortar uniformly stirred in preparation example 1 and comparative examples 1 to 3 was uniformly and respectively filled into a phi 50mm x 100mm circular rigid mold and preliminarily tamped, pressurized for 30s at a pressure of 3.0MPa by a compression tester, cured for 2h in 3% saline at a temperature of 10 ℃ to 20 ℃, and then demolded. And placing the demolded sample into a high-pressure reaction kettle, placing the demolded sample into a 3% saline water environment at the temperature of 10-20 ℃, and curing for 3 days and 30 days to prepare a rock sample for testing the compressive strength and the permeability. See table 3 for results.
3. Testing of compressive strength:
the wet rock sample with the diameter of 50X 100mm is placed into an NYL-60 type uniaxial stress tester for testing the compressive strength, the rock sample is placed into a compression-resistant container with the compression section of 50mm X50mm, the center of the rock sample, the center of the container and the center of a pressing plate of the tester are geometrically centered, the rock sample is uniformly loaded at the speed of 2400N/s until the rock sample is damaged, and the damage load F is recorded. Compressive strength R c Calculated by the following formula:
R c ＝F/A
f-breaking load (N); a-area under force (mm) 2 )
4. And (3) testing permeability:
and (3) putting the wet rock sample of phi 50 x 100mm into a core holder of a rock permeameter to test the permeability of the rock sample according to a national oil and gas industry standard SY/T (relative permeability test method of two-phase fluid in rock). Sealing by using rubber seal with a certain outer diameter, wherein the ring pressure is 1.2-1.4MPa, opening a water supply system, keeping the overflow constant with a constant water head, and counting the flow of a water outlet within 5min after the flow is stable. The permeability coefficient was calculated using the darcy formula and then converted to permeability:
wherein K is the permeability coefficient (cm/s); q is 5min seepage flow; l is the percolation length (cm); a is the cross-sectional area (cm) of seepage flow 2 ) (ii) a H is the head difference (cm); t is the percolation time(s). See table 3 for results.
TABLE 3
The reservoir simulation rock sample is obtained by artificial sampling according to a sea area seabed sand sample particle size distribution curve and the shale content. The reservoir simulation rock samples are respectively cemented by 20 meshes, 40 meshes, 100 meshes, 200 meshes, 500 meshes, 1000 meshes of montmorillonite and illite, and quartz by clay. The argillaceous content is 40.2%, the median of the sample particle size is 11 μm, the sample is high-mud fine siltstone, and the particle size and the physical property are basically consistent with the physical property of unconsolidated sediments of a reservoir.
As can be seen from table 3, in comparative example 2, the increase of the fly ash slightly reduces the compressive strength of the composite material but increases the permeability of the composite material compared to comparative example 1, and in comparative example 3, the compressive strength is not greatly increased but the permeability is improved by 20% compared to comparative example 2, and it is possible that on one hand, the hydroxyl groups of the bamboo fibers can form hydrogen bonds with the hydrated cement, and the hydrophilic elongated fibers provide a seepage channel for water. In example 1 in which cationic polyacrylamide was added, amide groups also formed hydrogen bonds with a part of the hydroxyl groups of bamboo fibers, and the high molecular weight cationic polyacrylamide increased the flow resistance of water. Thus, the permeability was reduced on the basis of comparative example 3, but the compressive strength was increased. Therefore, the coal ash and the hydrophilic bamboo fiber have synergistic effect, and the prepared cement polymer composite material has the advantages of obviously improved permeability under the condition of slightly increased strength, and good permeability and strength. After the cationic polyacrylamide is added, the fly ash and the hydrophilic bamboo fiber are cooperated, and the strength of the prepared cement polymer composite material is improved under the condition that the permeability is slightly increased.
5. Sand blocking simulation test
A sand blocking simulation test device (see the Dongtang silver, zhongbo, song Yang and the like, a sand blocking simulation test and evaluation method of a natural gas hydrate reservoir sand control medium, china university of Petroleum institute (Nature science edition), 2020, 44 (5): 79-88) is adopted, and the principle is shown in figure 1. The 4-medium sand blocking simulation displacement experiments prepared in the example 1 and the comparative examples 1 to 3 use the same pump flow, the same silt flow and the same silt volume content, and as the water-carrying displacement is carried out, the sand blocking medium is gradually blocked, so that the circulation and the permeability are reduced while the sand blocking is realized. The automatic sand feeder mixes a certain concentration of argillaceous siltstone into water, and the permeability of the argillaceous siltstone is tested for 3d and 30d by different sand blocking media. The permeability of the sand blocking media 3d and 30d was calculated using the darcy formula. See table 4 for results.
TABLE 4
As can be seen from table 4, after the mud sand flowing in one direction through the different sand-blocking media 3d of comparative example 1, comparative example 2, comparative example 3 and example 1, the permeability of the sand-blocking media is greatly reduced, but the permeability of the media of comparative example 1, comparative example 2, comparative example 3 and example 1 is still 1500mD, 1300mD, 1000mD and 1200mD respectively. It is shown that the high permeability porous sand-blocking media of comparative example 1, comparative example 2, comparative example 3, and example 1 still have good permeability after a certain amount of quicksand 3 d. After the unidirectional displacement flow of the sand through the different sand blocking media 30d of comparative examples 1, 2, 3, 1, the permeability of the media of comparative examples 1, 2, 3 is only a few millidarcies while the permeability of the media of example 1 is still 400 millidarcies. It is shown that the high permeability porous sand-blocking media of comparative example 1, comparative example 2, and comparative example 3 have poor permeability after flowing through a certain amount of quicksand 30d, while example 1 still has good permeability. This is because the permeability of the 4 sand-blocking media decreases significantly in the initial stage (3 d), but they still have a better permeability. However, fine sand in the fine sand flow is easier to pass through the sand blocking media of comparative examples 1, 2 and 3 under a certain pressure difference, part of the sand passes through the rock sample of the sand blocking media of comparative examples 1, 2 and 3, part of the fine sand moves for a longer distance in the sand blocking media, part of the fine sand is blocked in the later stage of the sand blocking media, and part of the mud forms a thin layer mud cake with certain permeability on the surface of the sand blocking media at a slow speed, so that (3 d) at the moment still has good water seepage performance, but the sand blocking effect of the sand blocking media of comparative examples 1, 2 and 3 is poor. Over time (30 d), the thin cake of mud was progressively packed with little seepage capacity at constant pressure differential. In example 1, the added cationic polyacrylamide can flocculate the silt with negative charges, fine silt with fine particle size is flocculated into loose coarse particles at the beginning (3 d), a filter cake with high permeability is formed on the surface of the blocking medium, and loose flocculated particles are gradually formed in the medium, so that the permeability is good at the beginning, most of the quicksand can be blocked, and the formed flocculated coarse silt cake has higher permeability than that of the fine silt cake along with the time, so that the sand blocking medium of example 1 has good water and air flow seepage capability after 30d compared with the sand blocking media of comparative examples 1, 2 and 3. Because the flocculation of the cationic polyacrylamide flocculates fine powder silt from the reservoir in the production process into coarse silt, the sand blocking medium in the embodiment 1 has better sand blocking capability, and has better seepage capability and smaller influence on water flow seepage capability along with the extension of production time compared with the sand blocking media prepared in the proportion 1, the proportion 2 and the proportion 3, and the production time of hydrate reservoir production liquid can be greatly prolonged.
Claims (4)
1. A porous cement polymer composite material is characterized in that fine recycled concrete with uniform grain diameter of 1-3mm is used as aggregate, porous fly ash and cement are used as cementing agents, bamboo fiber particles are used as auxiliary materials, and cationic polyacrylamide and water are added to form the porous cement polymer composite material; according to the total mass percent of 100%, the mass fraction of the bamboo fiber particles is 7% -8%, and the mass fraction of the cationic polyacrylamide is 1%; the aggregate and the cementing agent are collectively called as ash, the water-cement ratio is (0.3-0.6) to 1, and the mass ratio of the aggregate to the cementing agent is (3) (1-1.5).
2. The porous cement polymer composite material as claimed in claim 1, wherein the mass fraction of the bamboo fiber particles is 8%, the mass fraction of the cationic polyacrylamide is 1%, and the water cement ratio is 0.5.
3. The method for preparing the porous cement polymer composite material according to claim 1, comprising the steps of: stirring the aggregate and the cementing agent for 3-8 minutes, adding the bamboo fiber particles, the cationic polyacrylamide and water, stirring and mixing, filling the mixture into a mold, curing and curing, and demolding to obtain the high-performance bamboo fiber reinforced polypropylene composite material.
4. The use of the porous cement polymer composite of claim 1 for enhanced permeability enhancement in natural gas hydrate reservoirs, comprising the steps of: stirring the aggregate and the cementing agent, adding the bamboo fiber particles, the cationic polyacrylamide and water, stirring and mixing to obtain slurry, extruding the slurry into a hole, infiltrating a natural gas hydrate reservoir with a certain radius under certain pressure, and forming an artificial well wall.
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