CN113738328B - Production method for improving small sand compact gas reservoir yield - Google Patents
Production method for improving small sand compact gas reservoir yield Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention belongs to the technical field of oil field gas reservoir fracturing, and particularly relates to a production method for improving the yield of a small sand compact gas reservoir. The number of sand body layers of the small sand body compact gas reservoir is more than 2; the sand body deposition micro-phase is a estuary dam micro-phase or an underwater diversion river micro-phase; the compressive strength of the rock is 200-300 MPa; the elastic modulus is 40-50 GPa; the Poisson ratio is 0.2-0.3; the density of the rock is 2.4-2.7g/cm 3 (ii) a Performing fracturing modification in the following way: (1) Adopting mechanical layered fracturing, and constructing layer by layer from deep to shallow according to the depth; (2) And carrying out fracturing modification according to the sand body deposition microphase and the rock property to realize volume fracturing. The production method for improving the yield of the compact gas reservoir of the small sand body adopts a specific fracturing mode aiming at the sedimentary phase and lithological property of the small sand body, improves the distribution efficiency of the propping agent in the sand body, and improves the gas production degree.
Description
Technical Field
The invention belongs to the technical field of oil field gas reservoir fracturing, particularly relates to a production method for improving the yield of a small sand compact gas reservoir, and particularly relates to a mining technology of a compact low-permeability, low-porosity and low-abundance gas reservoir under different deposition microphases.
Background
With the increasing of the oil exploration and development degree, the difficulty of finding high-quality reserves is increased, the oil resources are gradually reduced, the gas price is continuously increased, and how to improve the recovery ratio becomes urgent. The Henan oil field has rich natural gas resources, and the characteristics of low permeability, early water breakthrough period of a gas well, low yield after perforation and the like of a natural gas reservoir are seriously keys for restricting the economic and effective development of the oil reservoir.
Geological reserve of natural gas of condensed gas reservoir of deep system of Anhui oil field 5.67X 10 8 m 3 In the rural area of the Anhui county of Tongbai county, henan province, the condensate oil geological reserve is 11.7 multiplied by 10 4 t, low condensate oil content of 66-170g/m, and low and medium abundance (2.93X 10) 8 m/km 2 ) The small condensate gas reservoir. The gas layer is mainly distributed in VII, VIII and IX oil sections of the kernel of the walnut garden, and the buried depth is 3000-4000m. The average porosity of the reservoir was 5.37% and the permeability was 1.29X 10 -3 And the micron is increased along with the buried depth, and is an ultra-low porosity and ultra-low permeability reservoir stratum. The reservoir is obviously controlled by the fracture of the basin edge, and the characteristics of multi-source gathering, short-distance transportation, rapid sedimentation and vertical superposition of multiple sets of reservoirs are formed. In the past, the landed oil field adopts depletion type exploitation to condensate gas reservoirs, but has some problems:
the gas reservoir has four low characteristics of low permeability, low pressure, low abundance and low yield, and a gas well has no natural capacity and can obtain economic yield only by fracturing modification.
And secondly, the deep layer of the installation shed is longitudinally, the well logging which is widely distributed is explained as the stratum of the dry layer, a set of method for identifying the gas-containing dry layer needs to be established, and the traditional dry layer is identified as the gas layer which can be industrially exploited.
And thirdly, because the reservoir is compact, the throat is in a nanometer-micron grade, and the water phase is generally in the characteristics of wetting and the like, the resistance of the natural gas during flowing is large, and the factors such as starting pressure, water saturation and the like have large influence on natural gas seepage. The natural gas flow is initiated only when the driving pressure gradient reaches the threshold starting pressure.
The heterogeneous type (IV) is a type in which a plurality of sets of single sand bodies are developed in the same layer, and the physical properties and gas contents of the sand bodies are greatly different, thus showing strong heterogeneity. Even the same dense sand body may form a plurality of gas reservoirs due to the heterogeneity of permeability. Gas in sand bodies with good physical properties is preferentially extracted, while sand bodies with relatively poor physical properties are not actually used for some time.
Disclosure of Invention
The invention aims to provide a production method for improving the yield of a compact gas reservoir of a small sand body, so that the distribution efficiency of a propping agent in the sand body is improved, sandstone with more areas is smashed, and the gas production degree is improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
production method for improving yield of small sand compact gas reservoir, wherein planar oil-gas containing area of small sand compact gas reservoir is less than 0.5km 2 Natural gas reserves < 0.4X 10 8 m 3 Condensate oil reserve less than 0.4X 10 4 t; the number of the sand body layers is more than 2; the sand body deposition micro-phase is a estuary dam micro-phase or an underwater diversion river micro-phase;
the compressive strength of the rock is 200-300 MPa; the elastic modulus is 40-50 GPa; the Poisson ratio is 0.2-0.3; the rock density is 2.4-2.7g/cm 3 ；
Performing fracturing modification by adopting the following modes:
(1) Aiming at the condition of containing multiple layers of sand bodies, mechanical layered fracturing is adopted, and the construction is carried out layer by layer from deep to shallow according to the depth;
(2) And carrying out fracturing modification according to the sand body deposition microphase and the rock property to realize volume fracturing.
The production method for improving the yield of the compact gas reservoir of the small sand body adopts a specific fracturing mode aiming at the sedimentary phase and lithological property of the small sand body, improves the distribution efficiency of the propping agent in the sand body, and improves the gas production degree.
Preferably, in the step (2), aiming at the sand body which is subjected to fracture reformation in the early stage and has closed fracture, small-scale fracture reformation is carried out on the closed fracture, then temporary plugging is carried out to form plugging steering, and then main fracturing for forming a complicated main fracture is carried out.
More preferably, the main fracturing stage comprises sequentially injecting a pad fluid, a sand carrying fluid and a displacement fluid; in the pre-fluid stage, slickwater and sand-carrying raw glue liquid are combined, the slickwater makes long cracks, and the sand-carrying raw glue liquid supports tiny cracks; in the sand carrying liquid stage, a small-particle-size slug, a raw glue solution and a large-particle-size slug are injected in sequence; and in the liquid replacing stage, the original glue solution is used for replacing in place.
Preferably, the particle sizes of the proppant in the sand-carrying raw glue solution, the small-particle-size slug and the large-particle-size slug are increased in sequence. The proppants in the sand-carrying virgin cement, the small-particle-size slug and the large-particle-size slug are respectively 70/140 meshes, 40/70 meshes and 30/50 meshes of ceramsite.
Preferably, the pre-liquid stage is constructed by changing the displacement and the liquid viscosity, the first slickwater, the first sand-carrying raw glue solution, the second slickwater and the second sand-carrying raw glue solution are injected in sequence, the construction displacement is gradually increased, and the raw glue solution viscosity is larger than that of the slickwater.
Preferably, in the step (2), the fracturing modification comprises injecting a pad fluid, a sand carrying fluid and a displacing fluid in sequence;
in the pre-liquid stage, cross-linking liquid is injected to open a reservoir, then sand-carrying slick water and slick water are alternately injected in sequence, filtration is reduced, cracks are expanded to a far position, and finally cross-linking liquid is injected;
in the sand-carrying liquid stage, sand-carrying cross-linking liquid and middle top liquid are sequentially and alternately injected, a main crack is opened, and the crack flow conductivity is improved;
and in the liquid displacing stage, the original glue liquid is used for displacing in place.
More preferably, the pre-liquid stage is used for injecting the sand-carrying slick water for 3 times, and the sand ratio is increased in sequence, wherein the sand is 70/140-mesh ceramsite.
Further preferably, in the sand carrying fluid stage, the sand carrying cross-linking fluid is co-injected for 4 times, and the sand ratio is sequentially increased; the method comprises the steps of firstly using fine-grain sand and then using coarse-grain sand, wherein the fine-grain sand is ceramsite of 40/70 meshes, and the coarse-grain sand is ceramsite of 30/50 meshes. Further preferably, in the sand-carrying fluid stage, the injection displacement of the sand-carrying cross-linking fluid is increased in sequence.
Drawings
Fig. 1 is a diagram of a fracturing string of example 1 of the present invention.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Specific examples of the production method for improving the yield of the small sand compact gas reservoir
Example 1
The production method for improving the yield of the small sand compact gas reservoir comprises the following steps:
(1) Characteristics of small sand compact gas reservoir
The target layer is a sandstone gas-bearing layer, and the buried depth is 3000m. The reservoir temperature was 130 ℃. In the longitudinal direction, the reservoir layers are more, the thickness is large, the lithology is compact, and the physical properties are poor. On a plane, the oil-gas containing area is 0.1km 2 . Natural gas reserve of 0.1X 10 8 m 3 Condensate reserves of 0.2X 10 4 t。
The number of layers in the longitudinal direction of the sand body is more than 2. The thickness of the single-layer sand body is less than 5m.
Rock compactness: the compressive strength is 200MPa; the elastic modulus is 45GPa; a Poisson's ratio of 0.25; rock density 2.4g/cm 3 。
Physical properties of rocks: permeability of 0.002X 10 -3 μm 3 (ii) a Porosity: 5 percent; irreducible water saturation was 40%.
Logging parameters: resistivity of 100 Ω · m; the sound wave time difference is 200 mu s/m; the well logging shows that a pinnate crack and a tectonic crack exist.
(2) Reforming by mechanical separate layer fracturing
The well type is a vertical well; the two mining layers are sealed and isolated by a packer; during construction, sand bodies are circularly transformed from the deepest depth to the shallowest depth according to the sequence of fracturing, pitching and fracturing. The ball throwing refers to throwing a steel ball and has the function of blocking the flowing direction of the fracturing fluid in the oil pipe. And after fracturing the reservoir stratum with the deep depth in the longitudinal direction, blocking a channel through which the pipe column of the flowing fracturing fluid flows downwards by throwing a steel ball, simultaneously opening the pipe column corresponding to the flowing fracturing fluid and the flow channel of the reservoir stratum with the shallow depth, and fracturing the reservoir stratum with the shallow depth after blocking.
The improved sand volume microphase comprises: estuary dam microphase. The reservoir sand body has been exploited through fracturing in the past, secondary fracturing exploitation is carried out at this time, the thickness of the sand body is smaller than 5m, and layered fracturing is carried out by using a layered fracturing pipe column. The water layer is arranged in the range of 10m-20m at the upper part or the lower part of the sand body.
The fracturing pump injection procedure is shown in table 1. The fracturing string diagram is shown in figure 1.
Table 1 fracturing pump injection procedure
In table 1, the fracture reformation consists of three stages of small-scale fracturing, temporary plugging and fracturing for creating complex main cracks. The composition of each working solution is as follows:
the composition of the raw glue solution is as follows: 0.45 percent of hydroxypropyl guar gum, 0.05 percent of sodium hydroxide, 1 percent of potassium chloride, 0.2 percent of high-temperature cleanup additive, 0.2 percent of bactericide and water.
The composition of the crosslinking solution is: 0.45% of hydroxypropyl guar gum, 0.05% of sodium hydroxide, 1% of potassium chloride, 0.2% of high-temperature cleanup additive, 0.2% of bactericide, water and a crosslinking agent (crosslinking ratio 100, organic boron crosslinking agent.
The composition of the slickwater is as follows: 0.25% of EM30 drag reducer +1.0% of potassium chloride +0.2% of high temperature cleanup additive + water.
The cross-linking agent is added into the raw glue solution to form cross-linking liquid, the viscosity of the raw glue solution is low, the viscosity is increased after the cross-linking agent is added, and the cross-linking liquid can carry the proppant with high sand concentration.
And transforming the closed fracturing fracture by small-scale fracturing, wherein the small-scale fracturing comprises pumping and injecting a pad fluid and a sand carrying fluid in sequence, and the sand ratio of the sand carrying fluid is gradually increased from 5% to 20%.
After small-scale fracturing, 100kg of temporary plugging agent is added along with the original glue solution, and then the original glue solution is continuously pumped to replace the temporary plugging agent into the crack. And after the pump is stopped for 20 minutes, the temporary plugging agent swells in the crack to form a plugging section. After temporary plugging, the mechanical distribution condition of underground rock is changed, and the flow direction of subsequent fluid is changed.
Furthermore, a water layer is arranged at the lower part of the sand layer, the temporary plugging agent is squeezed into the stratum and then the pump is stopped for a proper time, the temporary plugging agent is fully swelled, meanwhile, the propping agent sinks, a shield can be formed at the bottom of the crack, and the crack is clamped to extend downwards.
Fracturing of the complex main fracture: comprises sequentially pumping and injecting a pad fluid, a sand carrying fluid and a displacing fluid.
And in the fracturing stage of creating the complex main crack, the pad fluid comprises slickwater and raw glue solution which are alternately injected, wherein the slickwater is used for creating the long crack, and the raw glue solution is used for supporting the micro crack. Specifically, pumping is performed according to the sequence of slickwater, first sand-carrying raw glue solution, slickwater, second sand-carrying raw glue solution and raw glue solution. The first sand-carrying raw glue solution uses 70/140 mesh ceramsite, so that the effect of blocking tiny rock cracks is achieved, the net pressure in the cracks is improved, and the complexity of the cracks is increased.
And in the sand carrying liquid stage, the crosslinking liquid has the function of supporting the compact sandstone fracture. And pumping according to the mode of the first crosslinking liquid, the primary glue solution and the second crosslinking liquid. The first crosslinking liquid uses 40/70 mesh ceramsite, and the sand ratio is gradually increased from 10% to 25%. The second crosslinking liquid uses 30/50 mesh ceramsite, and the sand ratio is gradually increased from 20% to 35%.
And in the liquid replacing stage, the original glue solution is used for replacing the sand carrying liquid in place.
In the above pumping procedure, the proppant particle size is from fine to coarse along the pumping sequence. And the sand is added in multiple particle sizes, so that the connectivity between the branch seams is enhanced.
Furthermore, a construction method of changing displacement and liquid viscosity is adopted to control the extension of the crack in the longitudinal direction. The variable displacement refers to displacement change of a pad fluid stage; specifically, the discharge capacity is 3-4-4.5m 3 And/min. The variable viscosity means that the viscosity of the sand carrying fluid stage is greater than that of the pad fluid stage in comparison with the pad fluid stage. The viscosity of the slickwater is 5 MPa.s, and the viscosity of the base fluid (virgin rubber fluid) of the fracturing fluid reaches 60 MPa.s.
Example 2
The production method for improving the yield of the small sand compact gas reservoir comprises the following steps:
(1) Target layer is buriedThe depth of the reservoir is 3500m. The reservoir temperature was 132 ℃. In the longitudinal direction, the sandstone gas-bearing stratum has more reservoir layers, large thickness, compact lithology and poor physical properties. On a plane, the oil-gas containing area is 0.2km 2 . Natural gas reserve of 0.3X 10 8 m3, condensate oil reserve 0.3X 10 4 t。
The number of layers of the sand body is as follows: more than 2 layers; the thickness of the single-layer sand body is more than 5m;
rock compactness: the compressive strength is 210MPa; the elastic modulus is 42GPa; a Poisson ratio of 0.22; the density of the rock is 2.5g/cm 3 ；
The physical properties are as follows: permeability of 0.009X 10 -3 μ m3; porosity: 2 percent; irreducible water saturation 40%;
logging parameters: resistivity of 90 Ω · m; the sound wave time difference is 200 mus/m.
(2) By mechanical separate layer fracturing
Mechanical delamination measures reference is made to example 1. During construction, the sand body is reformed from the position with the deepest depth to the shallowest depth. The improved sand volume microphase comprises: and splitting the river microfacies underwater. The sand body is subjected to fracturing modification in the past, and a water layer exists in the range of 10-20 m at the upper part or the lower part of the sand body.
The fracturing pump injection procedure is shown in table 2.
TABLE 2 fracturing pump injection schedule
The construction stage is formed by combining a pad fluid stage, a sand carrying fluid stage and a displacement fluid stage. The components of each working solution are as follows:
the composition of the raw glue solution is as follows: 0.45 percent of hydroxypropyl guar gum, 0.05 percent of sodium hydroxide, 1 percent of potassium chloride, 0.2 percent of high-temperature cleanup additive, 0.2 percent of bactericide and water.
The composition of the crosslinking solution is: 0.45% of hydroxypropyl guar gum, 0.05% of sodium hydroxide, 1% of potassium chloride, 0.2% of high-temperature cleanup additive, 0.2% of bactericide, water and a crosslinking agent (crosslinking ratio 100:0.4; organic boron crosslinking agent.
The composition of the slickwater is as follows: 0.25% of EM30 drag reducer +1.0% potassium chloride +0.2% of high temperature cleanup additive + water.
The middle top liquid is the primary glue liquid.
In the pre-fluid stage, a mode of cross-linking fluid, first sand-carrying slickwater, second sand-carrying slickwater, third sand-carrying slickwater and cross-linking fluid is adopted. The sand ratios of the first sand-carrying slick water, the second sand-carrying slick water and the third slick water are increased in sequence and are respectively 5%, 7% and 9%.
In the sand carrying liquid stage, a mode of first cross-linking liquid, middle top liquid, second cross-linking liquid, middle top liquid, third cross-linking liquid, middle top liquid and fourth cross-linking liquid is adopted, the sand ratio of the first cross-linking liquid is 12-15%, the sand ratio of the second cross-linking liquid is 15-18%, the sand ratio of the third cross-linking liquid is 20-24%, and the sand ratio of the fourth cross-linking liquid is 25-35%. The first crosslinking liquid is divided into a front section and a rear section with the same liquid amount, and the sand ratio is respectively 12% and 15%. The second and third crosslinking liquids are the same. The fourth crosslinking liquid is divided into a front section, a middle section and a rear section, and the sand ratio is 25 percent, 30 percent and 35 percent in sequence.
The first, second and third cross-linking liquid uses 40/70 mesh ceramsite, and the fourth cross-linking liquid uses 30/50 mesh ceramsite.
The construction discharge capacity of the first, second, third and fourth cross-linking liquid is increased in sequence and is respectively 4.5, 5, 5.5 and 6m 3 /min。
In the fracturing process, the cross-linking fluid is firstly used for 4m 3 And (3) pressing open the reservoir at the displacement of/min, then using slickwater and a third-level powder ceramic slug to reduce filtration, on one hand, continuously expanding the crack to a far distance, and then using a cross-linking liquid to carry sand to open a main crack, thereby improving the flow conductivity of the crack and realizing volume fracturing.
According to the above method embodiment, the single well effect ratio is shown in table 3.
TABLE 3 comparison of Single well Effect before and after implementation
The results in table 3 show that the method of the present invention can effectively improve the formation conductivity and the gas recovery rate by reforming the small sand bodies.
Claims (7)
1. The production method for improving the yield of the small sand compact gas reservoir is characterized in that the planar oil-gas containing area of the small sand compact gas reservoir is less than 0.5km 2 Natural gas reserves < 0.4X 10 8 m 3 Condensate oil reserve less than 0.4X 10 4 t; the number of the sand body layers is more than 2; the sand body deposition micro-phase is a estuary dam micro-phase or an underwater diversion river micro-phase;
the compressive strength of the rock is 200 to 300MPa; the elastic modulus is 40 to 50GPa; the Poisson ratio is 0.2 to 0.3; carrying out rock density 2.4-2.7g/cm high-speed cultivation;
performing fracturing modification in the following way:
(1) Adopting mechanical layered fracturing, and constructing layer by layer from deep to shallow according to the depth;
(2) Performing fracturing transformation according to the sand body deposition microphase and the rock property to realize volume fracturing;
when the micro-phase of the sand body deposition is the micro-phase of the estuary dam, in the step (2), aiming at the sand body which is subjected to fracturing modification in the early stage and has closed fracturing fracture, small-scale fracturing modification is carried out on the closed fracturing fracture, then temporary plugging is carried out to form plugging steering, and then main fracturing for forming a complex main fracture is carried out;
the main fracturing stage comprises sequentially injecting a pad fluid, a sand carrying fluid and a displacement fluid; in the pre-fluid stage, slickwater and sand-carrying raw glue liquid are combined, the slickwater makes long cracks, and the sand-carrying raw glue liquid supports tiny cracks; in the sand carrying liquid stage, a small-particle-size slug, a raw glue solution and a large-particle-size slug are injected in sequence; a liquid displacing stage, namely displacing the original glue solution in place;
when the sand body deposition micro-phase is an underwater diversion river micro-phase, in the step (2), the fracturing modification comprises the steps of injecting a pad fluid, a sand carrying fluid and a displacement fluid in sequence;
in the pre-liquid stage, cross-linking liquid is injected to open a reservoir, then sand-carrying slick water and slick water are alternately injected in sequence, filtration is reduced, cracks are expanded to a far position, and finally cross-linking liquid is injected;
in the sand-carrying liquid stage, sand-carrying cross-linking liquid and middle top liquid are sequentially and alternately injected, a main crack is opened, and the crack flow conductivity is improved;
and in the liquid replacing stage, the original glue solution is used for replacing in place.
2. The method of claim 1, wherein the proppant in the sand-carrying virgin cement, the small-particle-size slug, and the large-particle-size slug are sequentially increased in particle size.
3. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 2, wherein the proppants in the sand-carrying raw glue solution, the small-particle-size slug and the large-particle-size slug are ceramsite of 70/140 mesh, 40/70 mesh and 30/50 mesh, respectively.
4. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 2 or 3, wherein the pre-liquid stage is constructed by changing the displacement and the liquid viscosity, the first slickwater, the first sand-carrying raw glue solution, the second slickwater and the second sand-carrying raw glue solution are injected in sequence, the construction displacement is gradually increased, and the raw glue solution viscosity is higher than the slickwater viscosity.
5. The method for improving the yield of the small sand compact gas reservoir as claimed in claim 1, wherein the pre-liquid stage is implemented by injecting sand-carrying slickwater for 3 times, the sand ratio is increased sequentially, and the sand is made of 70/140 mesh ceramsite.
6. The production method for improving the yield of the compact gas reservoir of the small sand body according to claim 1 or 5, wherein in the sand carrying fluid stage, the sand carrying cross-linking fluid is injected for 4 times, and the sand ratio is increased in sequence; the method comprises the steps of firstly using fine-grain sand and then using coarse-grain sand, wherein the fine-grain sand is ceramsite of 40/70 meshes, and the coarse-grain sand is ceramsite of 30/50 meshes.
7. The method for increasing the production of compact gas reservoirs with small sand bodies as claimed in claim 6, wherein the injection displacement of the sand-carrying cross-linking fluid is increased in the sand-carrying fluid stage.
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