A green reservoir skeleton reconstruction sand prevention method

Abstract

The present application belongs to the technical field of petroleum engineering, and particularly relates to a green reservoir skeleton reconstruction sand control method. The sand control method comprises the following steps: formation sand collection and pretreatment; mixing the formation sand with the sand-carrying fluid to form a suspended sand liquid; pumping the suspended sand liquid into the formation; pumping the sand consolidation agent into the formation; pumping the displacement fluid, waiting for setting, and opening the well. In the present application, the formation sand flushed out from the oil-water well in the same block is used to replace the artificial quartz sand to fill into the oil well reservoir, and then the sand consolidation agent is squeezed into the formation sand to consolidate the formation sand and establish an artificial well wall, so that the reservoir skeleton is reconstructed, the sand control mode of replacing the sand screen pipe as the sand blocking barrier is realized, the green treatment of the formation sand is realized, and the environmental pollution is reduced, so the present application has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of petroleum engineering technology, specifically relating to a method for sand control in the reconstruction of a green reservoir framework. Background Technology

[0002] Existing sand control methods involve filling the reservoir with artificial quartz sand to create an artificial wellbore that blocks formation sand. A filter pipe is then installed in the wellbore to prevent the quartz sand from flowing back into the wellbore. However, because quartz sand has a relatively large particle size, the artificial wellbore used to block formation sand differs in size from the local formation sand. During production, free fine sand from the reservoir can easily intrude into the artificial wellbore, forming a sand-mixed zone and reducing the permeability of the sand-blocking layer. Furthermore, the formation sand can clog the filter pipe, further reducing production capacity. This patent proposes replacing artificial quartz sand with formation sand flushed from oil and water wells in the same block. A sand-fixing agent is then injected into the formation sand to solidify it, creating an artificial wellbore. This reconstructs the reservoir framework, replacing the filter pipe as a sand-blocking barrier, and simultaneously achieving green treatment of the formation sand, reducing environmental pollution.

[0003] CN103775037A provides a sand control method that pumps solidified sand into the liquid-consolidated formation to prevent clay expansion, migration, and blockage. Simultaneously, a wire-wound screen is placed inside the wellbore, and 0.3-0.6mm quartz sand is filled between the screen and the well wall for sand control. This patent, however, involves filling the formation with sand from the local water wells and then filling it with a sand-consolidating agent to solidify the sand. The concepts and construction methods of these sand control methods differ significantly.

[0004] CN107575187A discloses a multi-stage plugging high-saturation filling method for water control and sand prevention in fine sand reservoirs. A multi-stage sand-blocking barrier is set between the mechanical sand-control screen and the fine sand reservoir. At the distal end, a smaller-particle-size sand-control and water-reducing proppant is used as the primary sand-blocking barrier; at the proximal end, a larger-particle-size quartz sand is used as the secondary sand-blocking barrier; and inside the wellbore, even larger-particle-size ceramsite is used as the tertiary sand-blocking barrier. This multi-stage sand-blocking barrier effectively removes mud and delays blockage. This patent, however, involves filling the formation with formation sand from the local well and then filling it with a sand-stabilizing agent to solidify the filled formation sand, thus delaying blockage.

[0005] CN105952420A provides a sand control method to reduce the pressure during filling construction. By controlling the sand-carrying fluid, when the surface filling pressure reaches the limit pressure, the pumping of the first sand-mixing fluid is stopped, and the reservoir-compatible fluid is injected to dilute the first sand-carrying fluid downhole, thereby reducing the construction pressure. This patent provides a sand control method that fills the formation sand of the block with water well formation sand in the formation, and then fills in a sand-fixing agent to solidify the filled formation sand, so as to delay the blockage of fine sand. The purpose of this patent is different, and the sand control method is also different.

[0006] CN109236246A discloses a sand control method that uses low-viscosity reservoir purification wastewater as a sand-carrying fluid. Using reservoir purification wastewater as a sand-carrying fluid can reduce the risk of sand blockage and burial. This patent provides a sand control method that fills the formation with formation sand from water wells in the same block and then fills it with a sand-fixing agent to solidify the filled formation sand, thereby delaying the blockage of fine sand reservoirs. The two sand control methods have different purposes and different measures. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing a green reservoir framework reconstruction method for sand control. This invention replaces artificial quartz sand with formation sand flushed from oil and water wells in the same block when filling the oil well reservoir. Then, a sand-fixing agent is squeezed into the formation sand to solidify the formation sand and build an artificial well wall, thereby reconstructing the reservoir framework. This method replaces filter pipes as a sand-blocking barrier and achieves green treatment of formation sand, reducing environmental pollution.

[0008] To achieve the above objectives, this invention discloses a method for sand control through green reservoir framework reconstruction, which includes, but is not limited to, the following steps:

[0009] (1) Formation sand collection and pretreatment;

[0010] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0011] (3) Pump the suspended sand solution into the formation;

[0012] (4) Pump the sand-fixing agent into the formation;

[0013] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0014] Preferably, the sand control method further includes block screening and formation sand screening steps.

[0015] Furthermore, the conditions for block screening are a fine sand oil layer with a permeability greater than 100md, a median particle size of less than 0.15mm, and a clay content of 15-30%.

[0016] Furthermore, the conditions for screening the formation sand are that the permeability of the formation sand after consolidation with the addition of a sand-fixing agent is above 100 md and the consolidation strength is above 1 MPa.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The formation sand of oil and water wells in the same block is used instead of artificial quartz sand. The particle size distribution of the formation sand of oil and water wells in the same block is similar to that of oil well formation sand. Compared with the single particle size distribution of quartz sand, the sand-blocking capacity is enhanced, which effectively avoids the formation sand from mixing into the sand-blocking layer, ensures the permeability of the sand-blocking layer, and realizes the reconstruction of the reservoir skeleton.

[0019] (2) By inserting a sand-fixing agent into the formation to solidify the formation sand filling the reservoir, the sand filter pipe is no longer needed, thus avoiding the blockage of the sand filter pipe and further ensuring production capacity. The formation sand flushed out by the oil and water wells is clean and free of oil stains after treatment, which can eliminate the influence of formation crude oil and mud on the solidification effect when the sand-fixing agent is used to solidify the sand and enhance the solidification strength.

[0020] (3) No mechanical tubing is left in the wellbore, which reduces the difficulty of post-treatment of oil and water wells, reduces operating costs, and allows for the secondary use of formation sand generated by oil and water wells, realizing the reconstruction of the reservoir skeleton, which has the advantages of being green and environmentally friendly; the sand control period is more than 2 years, and the production rate remains above 70% after sand control. Detailed Implementation

[0021] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0022] According to the purpose of this invention, a method for reconstructing and controlling sand in green reservoir frameworks is provided, which includes, but is not limited to, the following steps:

[0023] (1) Formation sand collection and pretreatment;

[0024] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0025] (3) Pump the suspended sand solution into the formation;

[0026] (4) Pump the sand-fixing agent into the formation;

[0027] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0028] In this invention, preferably, the sand control method further includes block screening and formation sand screening steps.

[0029] Furthermore, the conditions for block screening are a fine sand oil layer with a permeability greater than 100md, a median particle size of less than 0.15mm, and a clay content of 15-30%.

[0030] Furthermore, the conditions for screening the formation sand are that the permeability of the formation sand after consolidation with the addition of a sand-fixing agent is above 100 md and the consolidation strength is above 1 MPa.

[0031] In this invention, preferably, the formation sand mentioned in step (1) is the flushed sand from water wells or oil wells in this block.

[0032] In a preferred embodiment, the pretreatment step described in step (1) involves cleaning the formation sand with a cleaning agent, immersing the formation sand in the cleaning agent, and cleaning the formation sand inside the mixer truck.

[0033] Furthermore, the cleaning agent is a commercially available cleaning agent used for cleaning crude oil reservoirs during oil and gas field development, with a mass concentration of 5-90%.

[0034] In this invention, preferably, the sand-carrying fluid in step (2) includes a clean sand-carrying fluid, a guar gum sand-carrying fluid, and a sand-carrying fluid that can be used for sand-carrying operations from block sewage, and the sand ratio of the suspended sand fluid is 3-99%.

[0035] In this invention, preferably, the process of pumping the suspended sand fluid into the formation in step (3) is carried out by pumping it into the formation through an oil pipe or a filling tool.

[0036] Furthermore, the discharge rate of the suspended sediment pumped into the formation in step (3) is 0.5-5 m³. 3 / m, the amount of formation sand in the suspended sand solution is 1-5t / m.

[0037] In this invention, preferably, the sand-fixing agent in step (4) includes reticulated fiber sand, phenolic resin, and epoxy resin, which can be used as sand-fixing agents for sand prevention measures.

[0038] Furthermore, the sand-fixing agent described in step (4) is pumped into the formation via tubing or filling tools.

[0039] In a preferred embodiment, the amount of sand-stabilizing agent pumped into the formation in step (4) is 1-3 t / m, and the discharge rate of the sand-stabilizing agent pumped into the formation is 0.3-1.5 m. 3 / min.

[0040] In this invention, preferably, the well opening time in step (5) is 3-7 days after the completion of construction, more preferably 3-5 days, so as to allow the formation sand squeezed into the formation to fully react and solidify with the sand-fixing agent.

[0041] In this invention, preferably, before opening the well in step (5), the solidified material inside the wellbore should be ground up with a working tool and flushed out of the wellbore.

[0042] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0043] Example 1

[0044] The reservoir parameters of a single oil-bearing layer in Block B2 of Shengli Oilfield are as follows: permeability 500 md, median formation sand grain size 0.13, oil layer thickness 5 m, clay content 20%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand control in this block. The specific steps are as follows:

[0045] Block B2 has a permeability of 500 md, a median sand grain size of 0.13, and a clay content of 20%, which meets the block screening criteria of this invention.

[0046] (1) Collecting and pretreatment of formation sand

[0047] Take 500g each of the flushed sand from the B2 oil and water wells in block B, clean it with a 5% mass concentration cleaning agent, and then mix it with the reticulated fiber sand. The permeability was measured to be 120md and the consolidation strength to be 2MPa, which meets the formation sand screening standard.

[0048] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0049] The sand-carrying fluid is a clean sand-carrying fluid with a sand ratio of 3%.

[0050] (3) Pump the suspended sand solution into the formation;

[0051] The suspended sediment is pumped into the formation via tubing, with a pumping rate of 1.0 m³ / s. 3 / m, the amount of formation sand used in the suspended sand solution is 1t / m, and the total amount is 5t.

[0052] (4) Pump the sand-fixing agent into the formation;

[0053] The sand-fixing agent is pumped into the formation via a mesh fiber sand pump through the oil pipe. The pumping rate of the sand-fixing agent is 1 t / m, with a total volume of 5 t. The discharge rate of the sand-fixing agent pumped into the formation is 0.3 m. 3 / min.

[0054] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0055] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 3 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0056] On-site implementation results: The sand control effect lasts for 3 years, and the output remains above 75% after sand control, showing good on-site application results.

[0057] Example 2

[0058] The reservoir parameters of a single oil-bearing layer in Block B5 of Shengli Oilfield are as follows: permeability 800 md, median formation sand grain size 0.12, oil layer thickness 10 m, clay content 21.5%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand control in this block. The specific steps are as follows:

[0059] Block B5 has a permeability of 800 md, a median sand grain size of 0.12, and a clay content of 21.5%, which meets the block screening criteria of this invention.

[0060] (1) Collecting and pretreatment of formation sand

[0061] Take 500g each of the flushed sand from the B5 oil and water wells in block B, clean it with a 10% concentration cleaning agent, and mix it with the reticulated fiber sand. The permeability was measured to be 150md and the consolidation strength to be 2.5MPa, which meets the formation sand screening standard.

[0062] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0063] The sand-carrying liquid is wastewater from Block B5, with a sand ratio of 10%.

[0064] (3) Pump the suspended sand solution into the formation;

[0065] The suspended sediment was pumped into the formation using a filling tool, with a pumping rate of 1.2 m³ / s. 3 / m, the amount of formation sand used in the suspended sand solution is 2t / m, and the total amount is 20t.

[0066] (4) Pump the sand-fixing agent into the formation;

[0067] The sand-fixing agent is pumped into the formation using a filling tool with a mesh fiber sand pump. The pumping rate of the sand-fixing agent is 1.5 t / m, with a total volume of 15 t. The discharge rate of the sand-fixing agent pumped into the formation is 0.5 m. 3 / min.

[0068] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0069] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 4 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0070] On-site implementation results: The sand control effect lasts for 4 years, and the output remains above 78.2% after sand control, showing good on-site application results.

[0071] Example 3

[0072] Shengli Oilfield Block D 12 The parameters of a single oil-bearing reservoir are as follows: permeability 550 md, median formation sand grain size 0.11, oil layer thickness 8 m, clay content 15.8%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand erosion in this block. The specific steps are as follows:

[0073] Block D 12The permeability is 550 md, the median sand grain size is 0.11, and the clay content is 15.8%, which meets the block screening criteria of this invention.

[0074] (1) Collecting and pretreatment of formation sand

[0075] Take block D 12 500g each of sand flushed from oil and water wells were cleaned with a 50% concentration cleaning agent and then mixed with phenolic resin. The permeability was measured to be 180md and the consolidation strength to be 3.5MPa, which meets the formation sand screening standard.

[0076] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0077] Sand-carrying liquid for block D 12 Wastewater, sand ratio 25%.

[0078] (3) Pump the suspended sand solution into the formation;

[0079] The suspended sediment is pumped into the formation via tubing, with a pumping rate of 2.5 m³ / h. 3 / m, the amount of formation sand used in the suspended sand solution is 3t / m, and the total amount is 24t.

[0080] (4) Pump the sand-fixing agent into the formation;

[0081] The sand-fixing agent, phenolic resin, is pumped into the formation via the tubing at a rate of 2 t / m, totaling 16 t. The discharge rate of the sand-fixing agent into the formation is 0.8 m. 3 / min.

[0082] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0083] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 5 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0084] On-site implementation results: The sand control effect lasts for 5 years, and the output after sand control remains above 81.5%, showing good on-site application results.

[0085] Example 4

[0086] The reservoir parameters of the B5 heterogeneous reservoir in the Shengli Oilfield are as follows: permeability 1000 md, median formation sand grain size 0.13, oil layer thickness 12 m, clay content 22.7%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand from entering this block. The specific steps are as follows:

[0087] Block B5 has a permeability of 1000 md, a median sand grain size of 0.13, and a clay content of 22.7%, which meets the block screening criteria of this invention.

[0088] (1) Collecting and pretreatment of formation sand

[0089] Take 500g each of the flushed sand from the oil and water wells in Block B5, clean it with a 30% concentration cleaning agent, and mix it with the reticulated fiber sand. The permeability was measured to be 250md and the consolidation strength to be 3.8MPa, which meets the formation sand screening standard.

[0090] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0091] The sand-carrying fluid is a clean sand-carrying fluid with a sand ratio of 50%.

[0092] (3) Pump the suspended sand solution into the formation;

[0093] The suspended sediment was pumped into the formation using a filling tool, with a pumping rate of 4.0 m³ / s. 3 / m, the amount of formation sand used in the suspended sand solution is 4t / m, and the total amount is 48t.

[0094] (4) Pump the sand-fixing agent into the formation;

[0095] The sand-stabilizing agent is pumped into the formation using a filling tool with a mesh fiber sand pump. The pumping rate of the sand-stabilizing agent is 2.5 t / m, with a total volume of 30 t. The discharge rate of the sand-stabilizing agent pumped into the formation is 1.2 m. 3 / min.

[0096] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0097] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 6 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0098] On-site implementation results: The sand control effect lasts for 4.5 years, and the output after sand control remains above 81.2%, indicating good on-site application results.

[0099] Example 5

[0100] Shengli Oilfield Block M 13 The reservoir parameters of the heterogeneous oil layer are as follows: permeability 700 md, median formation sand grain size 0.14, oil layer thickness 20 m, clay content 24.2%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand erosion in this block. The specific steps are as follows:

[0101] Block M 13 The permeability is 700 md, the median sand grain size is 0.14, and the clay content is 24.2%, which meets the block screening criteria of this invention.

[0102] (1) Collecting and pretreatment of formation sand

[0103] Take block M 13 500g each of sand flushed from oil and water wells were cleaned with an 80% concentration cleaning agent and then mixed with phenolic resin. The permeability was measured to be 250md and the consolidation strength to be 2.6MPa, which meets the formation sand screening standard.

[0104] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0105] The sand-carrying solution is a guar gum-based sand-carrying solution with a sand ratio of 65%.

[0106] (3) Pump the suspended sand solution into the formation;

[0107] The suspended sediment is pumped into the formation via tubing, with a pumping rate of 0.5 m³ / h. 3 / m, the amount of formation sand used in the suspended sand solution is 2t / m, and the total amount is 40t.

[0108] (4) Pump the sand-fixing agent into the formation;

[0109] The phenolic resin sand-fixing agent is pumped into the formation via tubing at a rate of 1.8 t / m, totaling 36 t. The discharge rate of the sand-fixing agent into the formation is 1.0 m. 3 / min.

[0110] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0111] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 3 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0112] On-site implementation results: The sand control effect lasts for 5 years, and the output after sand control remains above 84.3%, indicating good on-site application results.

[0113] Example 6

[0114] Shengli Oilfield Block M 15 The reservoir parameters of the heterogeneous oil layer are as follows: permeability 1200 md, median formation sand grain size 0.12, oil layer thickness 15 m, clay content 21.5%, fine sand oil layer. The method of this invention is used to rebuild the reservoir framework and prevent sand erosion in this block. The specific steps are as follows:

[0115] Block M 15 The permeability is 1200 md, the median sand grain size is 0.12, and the clay content is 21.5%, which meets the block screening criteria of this invention.

[0116] (1) Collecting and pretreatment of formation sand

[0117] Take block M 15500g each of sand flushed from oil and water wells were cleaned with a 90% concentration cleaning agent and then mixed with reticulated fiber sand. The permeability was measured to be 300md and the consolidation strength to be 4.0MPa, which meets the formation sand screening standard.

[0118] (2) Formation sand and sand-carrying fluid mix to form suspended sand fluid;

[0119] Sand-carrying liquid for clearing block M 15 The wastewater has a sand content of 99%.

[0120] (3) Pump the suspended sand solution into the formation;

[0121] The suspended sediment is pumped into the formation using a filling tool, with a pumping rate of 5 m³ / h. 3 / m, the amount of formation sand used in the suspended sand solution is 5t / m, and the total amount is 75t.

[0122] (4) Pump the sand-fixing agent into the formation;

[0123] The sand-stabilizing agent is pumped into the formation using a filling tool with a mesh fiber sand pump. The amount of sand-stabilizing agent pumped into the formation is 3 t / m, with a total amount of 45 t. The discharge rate of the sand-stabilizing agent pumped into the formation is 1.5 m. 3 / min.

[0124] (5) Pump in the displacement fluid, wait for it to solidify, and then open the well.

[0125] Before well opening, the solidified material inside the wellbore should be ground up with working tools and flushed out of the wellbore. Well opening should be done 7 days after the completion of construction, so that the formation sand squeezed into the formation can fully react and solidify with the sand-fixing agent.

[0126] On-site implementation results: The sand control effect lasts for 4.5 years, and the output remains above 81% after sand control, showing good on-site application results.

[0127] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0128] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. Furthermore, various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the spirit of the present invention, and they should also be regarded as the content disclosed by the present invention.

Claims

1. A green reservoir skeleton reconstruction sand prevention method, characterized in that, The sand control method includes but is not limited to the following steps: (1) Formation sand collection and pretreatment; (2) Mixing formation sand with sand-carrying fluid to form suspended sand fluid; (3) Pumping the suspended sand fluid into the formation; (4) Pumping sand consolidation agent into the formation; (5) Pumping displacement fluid, waiting for setting, and opening the well; The sand control method also includes block screening and formation sand screening steps; The conditions for block screening are that the permeability is greater than 100 md, the median particle size is less than 0.15 mm, and the argillaceous content of the fine sand oil layer is 15-30%; The formation sand in step (1) is the flushed sand of the water well or oil well in the block. The conditions for formation sand screening are that the measured permeability after the formation sand is added with sand consolidation agent for consolidation is above 100 md, and the consolidation strength is above 1 MPa.

2. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The pretreatment step in step (1) is to clean the formation sand with a cleaning agent, which is immersed in the formation sand and cleaned in the mixing truck.

3. The green reservoir skeleton reconstruction sand prevention method according to claim 2, characterized in that, The cleaning agent is a cleaning agent for cleaning reservoir crude oil in oil and gas field development on the market, with a mass concentration of 5-90%.

4. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The sand-carrying fluid in step (2) includes clean sand-carrying fluid, guar gum sand-carrying fluid, and block sewage sand-carrying fluid for sand-carrying operation, and the sand ratio of the suspended sand fluid is 3-99%.

5. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, In step (3), the suspended sand fluid is pumped into the formation through tubing or filling tool.

6. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The displacement of the sand-carrying fluid pumped into the formation in step (3) is 0.5-5 m 3 / m, and the amount of formation sand in the sand-carrying fluid is 1-5 t / m.

7. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The sand consolidation agent in step (4) includes reticular fiber sand, phenolic resin, and epoxy resin for sand control measures.

8. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The amount of the sand consolidation agent pumped into the formation in step (4) is 1-3 t / m, and the displacement of the sand consolidation agent pumped into the formation is 0.3-1.5 m / min. 3 / min.

9. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, In step (4), the sand consolidation agent is pumped into the formation through tubing or filling tool.

10. The green sand reservoir skeleton reconstruction sand prevention method according to claim 1, characterized in that, The timing of opening the well in step (5) is 3-7 days after the construction is completed.

11. The green sand reservoir skeleton reconstruction sand prevention method according to claim 10, characterized in that, In step (5), the consolidated material in the wellbore should be ground with the operation tool before opening the well, and the wellbore is flushed out.