CN113738328A - Production method for improving output of small sand compact gas reservoir - Google Patents
Production method for improving output of small sand compact gas reservoir Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 97
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 16
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- 239000003345 natural gas Substances 0.000 claims description 10
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- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
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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/cm3(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 transformation 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 lithologic property of the small sand body, improves the distribution efficiency of the propping agent in the sand body, and improves the miningDegree of qi.
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 108m3In the rural area of the Anhui county of Tongbai county, Henan province, the condensate oil geological reserve is 11.7 multiplied by 104t, low condensate oil content of 66-170g/m, and low and medium abundance (2.93X 10)8m/km2) The small condensate gas reservoir. The gas layer is mainly distributed in VII, VIII and IX oil layers of three nuclear sections of the walnut garden, and the depth of burial is 3000-4000 m. The average porosity of the reservoir was 5.37% and the permeability was 1.29X 10-3μ m, increasing with depth of burial, is an ultra-low porosity, ultra-low permeability reservoir. The reservoir is obviously controlled by the fracture of the basin edge, and the characteristics of multi-source convergence, short-distance transportation, rapid sedimentation and vertical superposition of multiple sets of reservoirs are formed. Former ann canopy oil fieldDepletion mining is used for condensate reservoirs, but there are 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 (II) the underground deep layer system is arranged in the longitudinal direction, the widely distributed well logging is interpreted 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 used for industrial exploitation.
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 starting pressure threshold.
The heterogeneous type (IV) is that because a plurality of single sand bodies develop in the same layer, the physical property and the gas content of each sand body are different greatly, and the sand body shows stronger heterogeneous property. 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.
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 0.5km2Natural gas reserves < 0.4X 108m3Condensate oil reserve less than 0.4X 104t; 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; poise (a Chinese character)The bulk ratio is 0.2-0.3; the density of the rock is 2.4-2.7g/cm3；
Performing fracturing modification in the following way:
(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 transformation 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-liquid 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 proppant in the sand-carrying raw glue solution, the small-particle-size slug and the large-particle-size slug are ceramsite of 70/140 meshes, 40/70 meshes and 30/50 meshes respectively.
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 replacing stage, the original glue solution is used for replacing 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 liquid stage, the sand-carrying cross-linking liquid 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 40/70-mesh ceramsite, and the coarse-grain sand is 30/50-mesh ceramsite. 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
The following further describes embodiments of the present invention with reference to the 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 3000 m. The reservoir temperature was 130 ℃. In the longitudinal direction, the number of reservoir layers is large, the thickness is large, the lithology is compact, and the physical property is poor. On a plane, the oil-gas containing area is 0.1km2. Natural gas reserve of 0.1X 108m3Condensate oil reserve 0.2X 104t。
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 5 m.
Rock compactness: the compressive strength is 200 MPa; the elastic modulus is 45 GPa; a Poisson ratio of 0.25; rock density 2.4g/cm3。
Physical properties of rocks: permeability of 0.002X 10-3μm3(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 feather crack and a structural crack exist.
(2) 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, ball throwing 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 separate-layer fracturing is carried out by using a separate-layer 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. A 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 compositions of the working solutions were 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 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, water and a crosslinking agent (the crosslinking ratio is 100:0.4, and the organic boron crosslinking agent).
The composition of the slickwater is as follows: 0.25% EM30 drag reducer + 1.0% potassium chloride + 0.2% 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 sequentially pumping and injecting a pad fluid and a sand carrying fluid, 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 seam. 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, shielding 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 making the complex main crack, the pad fluid comprises slickwater and raw glue solution which are alternately injected, wherein the slickwater is used for making 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 to play a role in plugging tiny rock cracks, so that 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 controlled to gradually increase 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, the extension of the crack height in the longitudinal direction is controlled by adopting a construction method of changing the displacement and the liquid viscosity. The variable displacement refers to displacement change of a pad fluid stage; specifically, the discharge capacity is 3-4-4.5m3And/min. The variable viscosity means that the viscosity of the pad fluid stage is greater than that of the pad fluid stage compared with that of 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) the buried depth of the target layer is 3500 m. 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 0.2km2. Natural gas reserve of 0.3X 108m3, condensate oil reserve 0.3X 104t。
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 5 m;
rock compactness: the compressive strength is 210 MPa; the elastic modulus is 42 GPa; a Poisson ratio of 0.22; rock density 2.5g/cm3；
The physical properties are as follows: permeability of 0.009X 10-3μ m 3; porosity: 2 percent; irreducible water saturation 40%;
logging parameters: resistivity of 90 Ω · m; the acoustic wave time difference was 200. mu.s/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 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, water and a crosslinking agent (the crosslinking ratio is 100: 0.4; an organic boron crosslinking agent).
The composition of the slickwater is as follows: 0.25% EM30 drag reducer + 1.0% potassium chloride + 0.2% high temperature cleanup additive + water.
The middle top liquid is the primary glue liquid.
And 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%.
And in the sand carrying liquid stage, a mode of a first cross-linking liquid, a middle top liquid, a second cross-linking liquid, a middle top liquid, a third cross-linking liquid, a middle top liquid and a fourth cross-linking liquid is adopted, wherein 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 respectivelyIs 4.5, 5, 5.5 and 6m3/min。
In the above fracturing process, a crosslinking liquid is used at a rate of 4m3And (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 (10)
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 0.5km2Natural gas reserves < 0.4X 108m3Condensate oil reserve less than 0.4X 104t; 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 density of the rock is 2.4-2.7g/cm3；
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 transformation according to the sand body deposition microphase and the rock property to realize volume fracturing.
2. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 1, wherein in the step (2), aiming at the sand body which is subjected to the fracturing modification in the early stage and the fracture of which is closed, the small-scale fracturing modification is carried out on the closed fracture, then the temporary plugging is carried out to form the plugging diversion, and then the main fracturing for forming the complicated main fracture is carried out.
3. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 2, wherein the main fracturing stage comprises sequentially injecting a pad fluid, a sand carrying fluid and a displacement fluid; in the pre-liquid 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.
4. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 3, wherein 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 sequentially increased.
5. The production method for improving the yield of the small sand compact gas reservoir as claimed in claim 4, wherein the proppants in the sand-carrying raw glue solution, the small-particle-size slug and the large-particle-size slug are ceramsite with 70/140 meshes, 40/70 meshes and 30/50 meshes respectively.
6. The production method for improving the yield of the small sand compact gas reservoir according to any one of claims 3 to 5, 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 greater than the slickwater viscosity.
7. The production method for improving the yield of the small sand compact gas reservoir according to claim 1, wherein in the step (2), the fracturing modification comprises the steps of 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 replacing stage, the original glue solution is used for replacing in place.
8. The method for improving the yield of the small sand compact gas reservoir as claimed in claim 7, 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 70/140 mesh ceramsite.
9. The production method for improving the yield of the small sand compact gas reservoir according to claim 7 or 8, 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 40/70-mesh ceramsite, and the coarse-grain sand is 30/50-mesh ceramsite.
10. The method of claim 9, wherein the injection volumes of the sand-carrying fluid phases are sequentially increased.
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