Construction method of assembled composite site for oil and gas drilling well site

Abstract

This invention discloses a construction method for a prefabricated composite surface for oil and gas drilling sites, relating to the field of drilling site floor structure technology. The invention employs clay petrification technology to solidify the original soil into a surface base layer to meet engineering requirements. This clay petrification technology consists of two organic chemical substances: a powder and a liquid. The powder has strong water-reducing capabilities and is suitable for soils with high moisture content; the liquid improves the clay's resistance to hydration and, after dilution with water, is mixed with the clay, making it suitable for more humid areas. By using clay petrification technology to solidify the original soil into a surface base layer, the density can be further increased with continued use, making the clay increasingly petrified and harder. This prevents rainwater seepage into the base layer, avoiding soil softening and uneven settlement, preventing breakage of the surface panels, and improving the reusability of the surface panels.

Description

Technical Field

[0001] This invention relates to the field of drilling site pavement structure technology, and more specifically to a construction method for a prefabricated composite pavement for oil and gas drilling sites. Background Technology

[0002] According to the national energy strategy, the task of oil and gas extraction is heavy, and pre-drilling engineering, a temporary civil engineering project to ensure the orderly conduct of drilling operations, is a crucial link in the exploration and development chain, directly affecting the progress of natural gas extraction. Ensuring its quality and timely completion is a basic requirement. On the one hand, pre-drilling engineering construction in the Sichuan-Chongqing region faces challenges such as complex terrain, long rainy season, and heavy rainfall. Traditional methods typically use concrete, requiring formwork, steel reinforcement, pouring, vibrating concrete, curing, and cutting, among other things. This involves numerous trades, machinery, equipment, and procedures, with overlapping work areas and generally long construction periods, highlighting the conflict between project quality and schedule. On the other hand, according to the "Decision of the Ministry of Natural Resources on the First Batch of Repealed and Amended Departmental Regulations" issued at the 2nd Ministerial Meeting of the Ministry of Natural Resources on July 16, 2019, the "Implementation Measures of the Land Reclamation Regulations" explicitly stipulates that "land damaged by production and construction activities shall be reclaimed by the production and construction unit or individual according to the principle of 'whoever damages it, reclaims it'."

[0003] The demolition and reclamation of conventional concrete drilling sites after drilling operations inevitably generates a large amount of construction waste, the demolition, transportation, and disposal of which are unavoidable. Statistics show that there are approximately 150 drilling sites annually in the Sichuan-Chongqing region, each with a cast-in-place concrete area of ​​about 5,000 square meters and a thickness of 200 mm. This roughly estimates that approximately 150,000 cubic meters of construction waste are generated annually, posing significant environmental management challenges. Providing high-quality drilling sites quickly and efficiently, ensuring environmentally friendly oil and gas exploration and development in the Sichuan-Chongqing region, and reducing operating costs are currently major challenges.

[0004] For example, the invention patent application published on October 13, 2020, with publication number CN111764216A and titled "A Construction Method and Application of Prefabricated Concrete Road Slabs," describes a method for quickly and neatly completing road construction through six steps: prefabrication of concrete road slabs, foundation base construction, laying of waterproof and sand cushion layers, road slab installation, treatment of slab joints and earthen shoulders, and ancillary works. The road slabs of this invention are prefabricated in a factory, less affected by outdoor weather conditions, and the construction period is easily guaranteed. The road slabs of this invention use standardized dimensions, the molds are easy to make, and concrete pouring is convenient. They are applicable to various roadbeds with a certain load-bearing capacity, suitable not only for temporary transport roads and storage yards but also for road construction in disaster relief and rescue operations. The various processes of this invention are smoothly connected, construction equipment is centralized, waste during splicing is minimal and can be centrally disposed of, and on-site installation has a very small environmental impact.

[0005] The aforementioned single prefabricated site construction method still has unresolved structural and environmental problems and is not suitable for the complex sites of oil and gas drilling sites. Specifically, the development of oil and gas inevitably generates oily waste. Even with appropriate treatment methods, a small amount of oil may still seep through the gaps between the prefabricated site panels. This oil contains large molecular organic compounds such as polycyclic aromatic hydrocarbons, alkanes, and benzene compounds, which can pollute the soil environment. Furthermore, rainwater can easily seep into the underlying soil, causing it to soften and settle unevenly, losing its load-bearing capacity, and potentially leading to the breakage of the site panels. This poses certain structural safety and environmental risks. Summary of the Invention

[0006] To overcome the defects and shortcomings of the existing technology, this invention provides a construction method for prefabricated composite surfaces in oil and gas drilling sites. The purpose of this invention is to solve the problems of uneven soil settlement and softening of the base layer leading to surface panel breakage. This invention employs clay petrification technology to solidify the original soil into a surface base layer to meet engineering requirements. The clay petrification technology consists of two organic chemical substances: a powder and a liquid. The powder has strong water-reducing capabilities and is suitable for soils with high moisture content; the liquid improves the clay's resistance to hydration and, after dilution with water, is mixed with the clay, making it suitable for more humid areas. This invention uses clay petrification technology to solidify the original soil into a surface base layer. With continued use, the density can be further increased, making the clay increasingly petrified and harder. This prevents rainwater from seeping into the base layer, thus avoiding soil softening and uneven settlement, preventing surface panel breakage, and improving the reusability of the surface panels.

[0007] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0008] This invention provides a construction method for a prefabricated composite site for oil and gas drilling sites, the method comprising the following steps:

[0009] S1. Precast concrete panel;

[0010] S2, Construction of clay petrochemical base layer;

[0011] S3. Lay the impermeable layer. After completing the construction of the clay petrochemical base layer, lay the impermeable layer on the clay petrochemical base layer.

[0012] S4. Lay a buffer layer. After the impermeable layer is laid, lay a buffer layer on top of the impermeable layer.

[0013] S5. Installation of the field panel: After step S4 is completed, the precast concrete field panel from step S1 is transported to the well site for assembly.

[0014] S6. Dry-mixed rubber granule mortar is used to fill the joints between the panels after the panels are assembled.

[0015] A further preferred embodiment is the construction method of the clay petrified base layer, specifically:

[0016] S201. Before earthwork operations at the well site, the clay should be cleared and piled up, and then the earthwork leveling operation at the well site should be carried out.

[0017] S202. Analyze the clay and, based on its moisture content, formulate a treatment formula and design the base layer thickness.

[0018] S203. Spread the clay piled up in step S201 evenly on the well site. Add soil stabilizing liquid agent to the clay according to the treatment formula set in step S202 and mix it evenly.

[0019] S204. Monitor the moisture content of the soil mixed in step S203, and determine the amount of water-reducing powder to be used based on the measured moisture content.

[0020] S205. Based on the amount of water-reducing powder determined in step S204, weigh the water-reducing powder, add it to the soil mixed in step S203, add a certain proportion of cement, and mix thoroughly.

[0021] S206. Spread the mixture after thorough mixing in step S205 onto the surface after step S201.

[0022] S207. The road roller is used to first apply static compaction, and then vibratory compaction is performed.

[0023] More preferably, the soil stabilizing liquid agent is YJ-1 or YJ-2, and the water-reducing powder agent is FJ-1 or FJ-2; the dosage of the soil stabilizing liquid agent is 1% to 2% of the clay content; the dosage of the water-reducing powder agent is determined according to the required reduction in moisture content, and 1% of the clay content of the water-reducing powder agent is added for every 1.5% reduction in moisture content; the cement is 425 grade cement, and the cement dosage is 4% to 8% of the clay content.

[0024] In a further preferred embodiment, in step S207, a 18-22 ton road roller is used to first perform static compaction once, followed by vibratory compaction, and then the process is repeated 5 times.

[0025] A further preferred embodiment is the prefabrication method for the concrete slab.

[0026] S101. Make molds: According to the specifications of the concrete slab, make precast molds for the concrete slab.

[0027] S102. Fabrication of steel reinforcement cage: The steel reinforcement cage is tied point by point, and corner protection components are welded at the four corners.

[0028] S103. Embedded hangers: Multiple hangers are symmetrically embedded on the patterned surface of the panel and multiple hangers are embedded on the long side of the panel. All hangers are tied to the steel reinforcement skeleton.

[0029] S104. Set the wear-resistant layer. Spread the wear-resistant material evenly on the bottom mold of the precast mold made in step S101, and then pour cement slurry onto the wear-resistant material.

[0030] S105. Structural layer concrete pouring: After the cement slurry of the wear-resistant layer has initially set, pour the structural layer concrete on the wear-resistant layer, and vibrate and slurry to finish the surface.

[0031] S106. Set up an anti-slip layer. After the structural layer concrete has initially set, use a special tool to pull strips on the upper surface of the structural layer concrete as an anti-slip layer for the pavement.

[0032] S107. Curing and maintenance of the field panel: After the pouring is completed, use steam for continuous and uninterrupted curing for no less than 8 hours. After curing, transport it to the stockyard for further curing.

[0033] More preferably, the specifications of the scene include heavy-duty plates and light-duty plates, with the length-to-width ratio of the heavy-duty plates being 1:1 and the length-to-width ratio of the light-duty plates being 1:2.

[0034] In a further preferred embodiment, in step S101, when making the precast mold for the concrete slab, the bottom mold is made of a steel plate with raised texture, the side mold is made of channel steel, the long side mold is provided with tie holes, and the side mold is fixed by tie rods.

[0035] In a further preferred embodiment, in step S104, the thickness of the cement slurry is consistent with the thickness of the wear-resistant material.

[0036] A further preferred method for laying the seepage-proof layer in step S3 is as follows:

[0037] S301. Level the clay petrochemical base plane of step S2, and use medium or fine sand to level any uneven parts.

[0038] S302. Felt waterproof geotextile (400g specification) is used as the seepage prevention layer. The geotextiles are connected by welding, and double welds are set at the overlap. The width of the double welds is not less than 2mm×10mm. T-shaped staggered welding is adopted, and the misalignment between transverse welds is greater than or equal to 500mm.

[0039] In a further preferred embodiment, in step S4, when laying the buffer layer, dry-mixed rubber granule mortar is selected as the buffer layer material, and a laser level is placed in both the longitudinal and transverse directions of the board, with the buffer layer thickness being 50mm.

[0040] In a further preferred embodiment, the installation and construction of the field panel in step S5 is specifically as follows:

[0041] S501. First, lay out the installation location on paper and design the connection with the equipment foundation; plan the heavy load area and light load area, and the starting and ending points of the plate assembly should be 300mm~500mm away from the well site clear water ditch wall.

[0042] S502. Place a laser level at each end of the long side of the field panel to control the assembly height of the field panel.

[0043] S503. Use horizontal hoisting to ensure that the panels are placed stably at the installation point when they are in place, and control the gap width between the panels to be 10mm~15mm.

[0044] S504. The unassembled parts at the well site's clear water ditch were filled in with concrete.

[0045] In a further preferred embodiment, in step S6, a dry-mixed rubber granule mortar (cement:sand:rubber granules) with a ratio of 1:(2.5~4.5):1 is prepared, and the joints between the boards are manually filled to form a flat surface. The density of the joints is checked with a trowel, and it is deemed appropriate that the dry-mixed rubber granule mortar does not leak after the trowel is inserted and removed.

[0046] Furthermore, during the dismantling of the field panels, the field panels are first slowly hoisted to loosen the mortar. After the dry-mixed rubber granule mortar in the mortar is loosened, the mortar material around the field panels is cleaned. After the mortar material is cleaned, the field panels are hoisted onto the transport vehicle. Then, the dry-mixed rubber granule mortar of the buffer layer is collected into a pile, and the seepage prevention layer is cut and collected into rolls and transported to the next project for use, and the land at the well site is returned to cultivation.

[0047] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0048] 1. The construction method of this invention reduces the amount of construction waste. There are approximately 150 drilling sites in the Sichuan-Chongqing region each year, each with an area of ​​about 100m × 50m and a 20cm thick cast-in-place concrete layer. Based on this, it is roughly estimated that each drilling site generates approximately 150,000m³ of construction waste. If a drilling site has an assembly panel area of ​​2000 square meters, and the panel is rotated weekly, it can be reused once a week, reducing construction waste emissions by 400m³ per rotation.

[0049] 2. The construction method of this invention can reduce environmental pollution during the disposal process and promote energy conservation and carbon reduction. Because the material is reused within the well site, the mining of sand and gravel raw materials and the use of cement are reduced. Simultaneously, noise, dust, and water and electricity consumption at the construction site are reduced. This avoids the construction waste generated during the demolition of concrete after traditional construction reclamation and the dust generated during its transportation, thereby reducing the environmental impact of traditional construction and promoting the green development of drilling projects.

[0050] 3. The construction method of this invention accelerates the construction period and reduces construction costs. Compared with traditional cast-in-place concrete well site construction, it saves 7-14 days of construction and maintenance time and costs, thereby reducing construction costs.

[0051] 4. This invention applies prefabricated well site panels on a large scale in oil drilling engineering, which is the first time this has been done both domestically and internationally, improving the safety, reliability and applicability of conventional well site floor structures.

[0052] 5. The top of the board is equipped with an anti-slip and wear-resistant layer to prevent slips and falls caused by oil stains, and to address the issue of wear and tear from dragging drill rods and other equipment. Corner guards are installed around the board's perimeter to prevent corner damage during transportation, installation, dismantling, and repeated use. Lifting studs are installed on the board surface to address issues such as uneven lifting, inconvenience in installing and removing slings during installation. Demolding studs are installed on the sides of the board to address lifting difficulties during manufacturing, transportation, and handling. An anti-slip layer is installed on the bottom of the board to prevent slippage during use.

[0053] 6. This invention incorporates a clay petrified base layer, reducing the environmental problems easily caused by oil seepage during drilling in traditional drilling environments. Furthermore, this clay petrified base layer will become increasingly compacted and gradually petrified during subsequent use, preventing hollow areas in the drilling panel base layer and avoiding the possibility of the drilling panel breaking under pressure.

[0054] 7. The construction method of this invention allows the site panels to be dismantled and transported to another well site for continued use after use at one well site, solving the problem of disposing of large amounts of construction waste generated by the demolition of traditional cast-in-place concrete surfaces. The prefabricated composite structure replaces the cast-in-place concrete structure, solving the problem of land reclamation after drilling, restoring the soil to its original arable capacity, achieving the effects of resource conservation and ecological protection. Quality is guaranteed; the prefabricated site panels can be prefabricated in the factory, solving the problems of difficulty in controlling quality and curing during on-site pouring. Attached Figure Description

[0055] Figure 1 This is a flowchart illustrating the construction method of the prefabricated composite structure according to the present invention.

[0056] Figure 2 This is a schematic diagram of the layered structure of the prefabricated composite scene of the present invention;

[0057] Figure 3 This is a schematic diagram of the structure of the field panel of the present invention;

[0058] Figure 4 This is a schematic diagram of the hanging nail assembly structure on the surface panel of the present invention;

[0059] Figure 5 This is a schematic diagram of the steel reinforcement frame structure of the field panel of the present invention;

[0060] Figure 6 This is a schematic diagram of the structure of the composite field panel after splicing together multiple field panels of the present invention;

[0061] Figure 7 This is a schematic diagram of the panel seam structure after splicing multiple panels of the composite field according to the present invention;

[0062] Attached reference numerals: 1. Site panel, 2. Clay petrochemical base layer, 3. Impermeable layer, 4. Buffer layer, 5. Panel joint, 6. Reinforcing steel frame, 7. Hanging nail, 8. Corner guard component. Detailed Implementation

[0063] The present invention will now be described in detail with reference to specific embodiments. The present invention is illustrated in drilling sites in various natural gas regions of Sichuan and Chongqing, including tight oil and gas reservoirs, deeper gas reservoirs, and shale gas reservoirs. The following embodiments are merely a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0064] Example 1

[0065] As a preferred embodiment of the present invention, please refer to the appendix to the specification. Figure 1 As shown in the figure, this embodiment discloses a construction method for a prefabricated composite surface for oil and gas drilling sites. The construction method includes the following steps:

[0066] S1. Precast concrete panel;

[0067] S2, Construction of clay petrochemical base layer;

[0068] S3. Lay the impermeable layer. After completing the construction of the clay petrochemical base layer, lay the impermeable layer on the clay petrochemical base layer.

[0069] S4. Lay a buffer layer. After the impermeable layer is laid, lay a buffer layer on top of the impermeable layer.

[0070] S5. Installation of the field panel: After step S4 is completed, the precast concrete field panel from step S1 is transported to the well site for assembly.

[0071] S6. After the slab panels are assembled, use dry-mixed rubber granule mortar to fill the joints between the panels. The composite slab structure completed with dry-mixed rubber granule mortar is shown in the attached image. Figure 2 As shown. From top to bottom, it includes a clay petrified base layer, an impermeable layer, a buffer layer, and a field panel.

[0072] In the clay petrochemical base layer, the clay petrochemical technology consists of two organic chemical substances: powder and liquid. The main function of the powder is to reduce water content, while the main function of the liquid is to improve the soil's water stability and resistance to hydration. The powder has a strong water-reducing capacity and is suitable for soils with high moisture content; the liquid can improve the clay's resistance to hydration and, after being diluted with water and mixed with the clay, is suitable for more humid areas.

[0073] The water-reducing and compacting powder does not act as an oxidant or a binder. Instead, it accelerates the natural processes of water removal and air desorption on the surface of clay particles, treats water in the soil, and promotes dense particle arrangement, thereby enabling the engineering soil to improve its physical and chemical properties and be put into use in a short period of time. This product is environmentally friendly and recyclable.

[0074] Clay petrifying agent liquid breaks the electrical potential carried by clay particles by blocking and isolating the water film adhering to them. This causes the fine clay particles to aggregate irreversibly, making the treated soil easier to compact, increasing its density and hydration resistance. Simultaneously, by hindering the capillary ascent and adhesion of water, the density can further increase with continued use, making the clay increasingly petrified and harder.

[0075] Based on the specific soil conditions at the project construction site, experiments determined that the powder and liquid agents could be used separately or in combination, or combined and then used interchangeably with other curing agents. Its core advantage is that it can be formulated to suit various moisture contents and adapts well to all situations.

[0076] Felt waterproof geotextile is used as the seepage prevention layer. A 50mm thick dry-mixed rubber mortar layer is set as the structural buffer layer, with the ratio of cement:dry sand:rubber particles being 1:(2.5~4.5):1.

[0077] Prefabricated field panel: ① On the top layer of the prefabricated field panel, in order to meet the friction of drill rods and other materials on the field during drilling and to prevent workers from slipping when the field is contaminated with oil, a layer of anti-slip and wear-resistant structure similar to patterned steel is set up to increase the anti-slip and wear-resistant properties of the prefabricated panel.

[0078] ② In the design and manufacturing of prefabricated field panels, to meet the passage requirements of special heavy-duty petroleum vehicles (some of which meet or exceed the highway engineering technical standards for Class 20 vehicles) during relocation and installation, and to prevent acid and alkali corrosion during acidification and fracturing, the optimal panel dimensions (length-to-width ratio of 1:1 to 1:2), and the rational configuration of reinforcing steel and acid- and alkali-resistant (P6) impermeable concrete were determined through tests on load-bearing capacity, assembly speed, and stability. The prefabricated field panels were manufactured using an inverted method. First, wear-resistant material was spread inside the formwork, then a reinforcing mesh was placed, and the structural layer concrete was poured. After vibration and finishing, a special tool was used to pull strips along the short side as an anti-slip layer for the paving. Two hanging nails were installed on the side of the panel for easy demolding and loading / unloading; four installation hanging nails were installed on the top surface of the panel for easy installation. The hanging nails are as follows: Figure 4 As shown. To reduce collision damage to the prefabricated panels during transportation, hoisting, and use, angle steel is installed at the four corners of the panels for protection, such as... Figure 3 and Figure 5 As shown.

[0079] ③ On the bottom layer of the prefabricated panel, an anti-slip layer is set along the short side using a special tool to increase the friction of the panel bottom and prevent displacement during use.

[0080] In this embodiment, when dismantling the field panel, the field panel is first slowly hoisted to loosen the mortar. After the dry-mixed rubber granule mortar in the mortar is loosened, the mortar material around the field panel is cleaned. After the mortar material is cleaned, the field panel is hoisted onto the transport vehicle. Then, the dry-mixed rubber granule mortar of the buffer layer is collected into a pile, and the seepage prevention layer is cut and collected into rolls and transported to the next project for use, so as to restore the well site land to cultivation.

[0081] Example 2

[0082] As another preferred embodiment of the present invention, this embodiment further supplements and elaborates on the technical solution of the present invention based on the above-described embodiment 1. In this embodiment, the construction method for prefabricated field panels is as follows:

[0083] Step 1: Making the mold

[0084] The panel is available in two aspect ratios: 1:1 and 1:2. The bottom formwork is made of textured steel plate, 15mm thick; the side formwork is made of 16#a type channel steel, 160mm high and 6.5mm thick. The long side formwork is equipped with tie rods with 14mm diameter for fixing.

[0085] The aspect ratio of the heavy-duty plate is 1:1, and the aspect ratio of the light-duty plate is 1:2.

[0086] Step 2: Construction of the steel frame

[0087] The steel reinforcement cage is tied point by point, and corner protection components are welded at the four corners.

[0088] Step 3: Embedding lifting components

[0089] Four hanging nails are symmetrically embedded on the patterned side of the slab. Two hanging nails are embedded on the long side for easy formwork replacement. The hanging nails are tied to the reinforcing steel frame.

[0090] Step 4: Wear-resistant layer

[0091] Evenly spread wear-resistant material on the bottom mold, then pour cement slurry with a thickness consistent with that of the wear-resistant aggregate.

[0092] Step 5: Structural layer concrete pouring

[0093] After the cement slurry for the wear-resistant layer has initially set, pour the concrete for the slab structure layer, vibrate and compact it to finish the surface.

[0094] Step 6: Anti-slip layer

[0095] After the concrete has initially set, a special tool is used to pull strips along the short side as an anti-slip layer for the paving.

[0096] Step 7: Maintenance and Care of the Field Panels

[0097] After pouring, the precast panels are continuously cured with steam for no less than 8 hours. Using the side-mounted screws, the precast panels are flipped over and lifted onto a transport vehicle, then transported to the storage yard for further curing.

[0098] Example 3

[0099] As another preferred embodiment of the present invention, this embodiment is a further detailed description and supplement to the technical solution of the present invention based on the above-described Embodiment 1 or Embodiment 2. In this embodiment, the clay petrified base construction method...

[0100] Step 1: Before earthwork operations at the well site, the clay should be cleared and piled up. Then, the earthwork leveling operation at the well site should be carried out.

[0101] Step 2: Analyze the clay and, based on its moisture content, determine the treatment formula and design the base layer thickness. The treatment thickness is 300mm~600mm.

[0102] Step 3: Spread the clay piled up in Step 1 evenly on the well site, add soil stabilizing liquid, and mix it evenly with an excavator.

[0103] Step 4: Test the moisture content of the mixed soil and use the data to determine the amount of water-reducing powder to be used.

[0104] Step 5: Add the determined amount of water-reducing powder in step 3, along with a certain proportion of cement, and use an excavator to thoroughly mix the powder and soil.

[0105] Step 6: Use a loader to spread the fully mixed material onto the site where Step 1 was completed.

[0106] Step 7: Use an 18-22 ton road roller to perform static compaction once, then vibratory compaction, and repeat the process 5 times.

[0107] The soil stabilizing liquid agent is YJ-1 or YJ-2, and the water-reducing powder agent is FJ-1 or FJ-2. The selection of the soil stabilizing liquid agent corresponds to the selection of the water-reducing powder agent; if the soil stabilizing liquid agent is YJ-1, then the water-reducing powder agent is FJ-1; if the soil stabilizing liquid agent is YJ-2, then the water-reducing powder agent is FJ-2. The dosage of the soil stabilizing liquid agent is 1% to 2% of the clay content; the dosage of the water-reducing powder agent is determined according to the required reduction in moisture content; for every 1.5% reduction in moisture content, 1% of the clay content of the water-reducing powder agent is added; the cement is 425 grade cement, and the cement dosage is 4% to 8% of the clay content.

[0108] Example 4

[0109] As another preferred embodiment of the present invention, this embodiment is a further detailed description and supplement to the technical solution of the present invention based on the above-described embodiments 1, 2, or 3. In this embodiment, the construction method for laying the impermeable layer is as follows:

[0110] Step 1: Level the base plane in Step 2. Use medium or fine sand to level any uneven areas.

[0111] Step 2: The geotextile is connected by welding, with double welds at the overlap. The width of the double welds should not be less than 2mm × 10mm; a T-shaped staggered welding method should be used; the misalignment between transverse welds should be greater than or equal to 500mm.

[0112] Furthermore, the construction method for the buffer layer is to place a laser level in both the longitudinal and transverse directions of the slab; the thickness of the buffer layer is 50mm, and dry-mixed rubber granule mortar is selected as the buffer layer material.

[0113] Example 5

[0114] As another preferred embodiment of the present invention, this embodiment is a further detailed description and supplement to the technical solution of the present invention based on the above-described embodiments 1, 2, 3, or 4. In this embodiment, the field panel is installed as follows:

[0115] Step 1: First, lay out the installation location of the well site on paper and design the connection with the equipment foundation. Plan the heavy-load area and light-load area, and the start and end points of plate assembly should be 300mm~500mm away from the well site's clear water ditch wall.

[0116] Step 2: Place a laser level at each end of the long side of the board to control the assembly height of the board.

[0117] Step 3: Use a crane or a proven excavator with lifting capabilities to lift the panel. The panel should be lifted horizontally to ensure it is placed stably at the installation point. The panel gap width should be controlled between 10mm and 15mm. Figure 6 As shown.

[0118] Step 4: The unassembled parts at the well site's clear water ditch were filled in with C20 concrete.

[0119] like Figure 7 As shown, for caulking with dry-mixed rubber granule mortar, prepare a 1:(2.5~4.5):1 dry-mixed rubber granule mortar and manually fill the joints, filling the flat surface. Use a trowel to check its density; it is suitable when the dry-mixed rubber granule mortar does not leak after the trowel is inserted and removed.

[0120] Panel removal:

[0121] Step 1: First, use a crane or an excavator with proven lifting capabilities to slowly lift and loosen the mortar joints. Then, manually clean the surrounding mortar material and lift the board onto the transport vehicle.

[0122] Step 2: Collect the dry sand into piles, cut the geotextile into rolls, and transport them to the next project for use.

[0123] Step 3: Returning the well site land to cultivation.

[0124] Example 6

[0125] As a specific embodiment of the present invention, the construction method of the prefabricated composite site for oil and gas drilling sites described in Embodiments 1, 2, 3, 4, or 5 above was applied to the pre-drilling engineering site of the Jinqiu Gas Well area drilling site in a tight oil and gas reservoir. It was implemented starting in June 2021 (the construction process was closed and not publicly disclosed). The average installation period for each pre-drilling engineering site panel was 8.2 days. To date, four projects in this area have been reused. The actual application includes the following steps:

[0126] Step 1: Precast concrete well site panels. Based on the actual site conditions, transportation conditions, load level, and construction site environment of the drilling site, the length-to-width ratio of the well site panels is selected to be 1:2.

[0127] Step 2: Construction of clay petrochemical base course. For the tight gas block, an environmentally friendly prefabricated composite structure with a soil base course of 26% moisture content is used for heavy-load construction. The filler material of the drilling site base course is treated with 8% soil water-reducing powder and 3% soil stabilizing liquid. The drilling site base course is excavated into the base course with an excavator to a depth of about 0.6m (including 10cm of base course mixed with soil stabilizing liquid).

[0128] Step 3: Lay the geotextile. The laying should be smooth and moderately taut, and it should be in contact with the base layer. The geotextile should be laid from the outside of the well site to the inside.

[0129] Step 4: Lay a sand buffer layer with a thickness of 50mm. The leveling layer should be compacted during laying to prevent separation of coarse and fine particles.

[0130] Step 5: Install the field panels. Install the field panels according to the survey and layout results. The assembly work proceeds from the corners of the well site towards the center, with alternating weft threads at the edges. The hooks can only be removed after the heavy-duty PC panels are firmly in place.

[0131] After step three is completed, the prefabricated field panels from step one are transported to the well site for assembly.

[0132] Step Six: Fill the gaps with dry-mixed rubber granule mortar. Use manufactured sand to sweep the gaps between the boards. The sand between the boards must be filled tightly. The spacing between the boards must be 8-10mm. The hanging holes and grooves of the field panels should be sealed with manufactured sand or other materials.

[0133] Step 7: Remove the field panel. After Step 6 is completed and put into use, remove it and reassemble it at the next well site.

[0134] In practical application, based on the actual site conditions, transportation conditions, load level, and construction environment of the prefabricated drilling site, the length and width of the panel were selected for natural gas drilling sites in tight oil and gas reservoir areas, with a length-to-width ratio of 1:2. During panel fabrication, a factory-made natural gas steam boiler was used for heating and curing, effectively shortening the curing time. The panel surface features a textured, embossed design to enhance its anti-slip and wear-resistant layer, while the bottom layer uses a roughened texture to enhance its anti-slip and anti-displacement properties. To reduce damage from collisions during transportation, hoisting, and use, four lifting nails were used to secure the panel to the upper and lower surfaces of the steel reinforcement frame. Steel corner protectors were added to the four corners of the panel to prevent damage from collisions during transportation and installation.

[0135] The base course filler at the drilling site was treated with 8% soil water-reducing powder and 3% soil stabilizing liquid. An excavator was used to excavate the base course to a depth of approximately 0.6m (including 10cm of the base course formed by mixing with the soil stabilizing liquid). An excavator was used to mix the soil with the soil stabilizing liquid on-site. The moisture content of the mixed soil was tested to determine the dosage of the water-reducing powder. The determined dosage of water-reducing powder was buried in the soil, and the powder and soil were thoroughly mixed using an excavator, with 2% cement added. A loader was used to spread the fully mixed material onto the base course, and a road roller was used to compact it.

[0136] Geotextile is used as the seepage prevention layer. The laying should be smooth, with appropriate tension, and in contact with the base layer. The geotextile should be laid from the outside of the well site inwards. Manufactured sand is used as the leveling layer, with a thickness of 50mm. The leveling layer should be compacted during laying to prevent separation of coarse and fine particles.

[0137] According to the survey and layout results, the paving panels should be installed, with assembly work proceeding from the corners of the well site towards the center, and the edges should be laid with alternating headers. Following the plan layout and paving direction, workers and construction machinery should coordinate to assemble each panel one by one. When using hoisting equipment, the panels should be lifted and lowered slowly, and cables should be used to control the stability of the paving panels. When the paving panels are in place, they must not be pushed or stepped on by hand. The hook can only be removed after the panel is firmly in place. Excavators can be used to align the paving panels, placing sleepers (5cm thick) on the panels and hammering them downwards. For heavy-duty PVC panels, timely adjustments should be made to meet design requirements. Ensure consistent panel spacing and that the height difference between adjacent panels meets requirements.

[0138] After the panel installation is completed, use manufactured sand to clean the gaps between the panels; the sand between the panels must be filled tightly, and the spacing between the panels must be 8-10mm; the lifting holes and grooves of the panel should be sealed with manufactured sand or other materials.

[0139] A 50cm gap is left between the site panel and the well site, and the same grade C35 concrete is used to pour the well site to the same elevation, so that the well site and the site panel form an integral whole.

[0140] This batch of tight gas prefabricated natural gas drilling platforms has been used in four projects in the area to date. The platforms were disassembled using cranes and transferred to the next batch of well sites for assembly. The technical method of this invention ensures quality control, clean processes, and rapid on-site assembly. Inspection after disassembly showed excellent performance. Due to the protection of the four corners of the platform panels with angle steel, no damage or scrap occurred throughout the entire service life, resulting in a 100% reuse rate and low maintenance costs, thus ensuring stable production in natural gas development.

[0141] Example 7

[0142] As another specific embodiment of the present invention, the difference from Embodiment 6 is as follows: This application is carried out on the pre-drilling engineering site of a 10,000-meter deep well site in northwestern Sichuan (closed construction, not publicly disclosed), with a paved area of ​​5,630 square meters. It is currently in use. The area of ​​this well site is twice that of a conventional pre-drilling engineering site. The long drilling cycle of deep wells results in a longer time for using the site panels compared to conventional drilling. 2,516 square meters of the site panels are reused from other turnover well site panels. In the second step of Embodiment 6, the base treatment is considered as an environmentally friendly prefabricated composite structure in a heavy-load area of ​​soil base with an original soil moisture content of 22%, and the following method is adopted:

[0143] The base filling material of the drilling site is made of 5% soil water-reducing powder and 2% soil stabilizing liquid. The base filling material is excavated into the drilling site using an excavator to a depth of about 0.6m (including 10cm of base layer mixed with soil stabilizing liquid).

[0144] An excavator was used to mix the soil with a soil stabilizing agent on-site. The moisture content of the mixed soil was then tested, and the data was used to determine the dosage of water-reducing powder.

[0145] The determined amount of water-reducing powder is buried in the soil, and an excavator is used to thoroughly mix the powder and soil, and 3% cement is added.

[0146] A loader is used to spread the fully mixed material onto the base course, and a road roller is used to compact it.

[0147] For large-area prefabricated paving, temporary storage space for the paving panels needs to be considered on-site. A trial lift should be conducted first, with a height of 50cm. During the trial lift, the reliability of the connection between the lifting rope and the prefabricated paving panel, and between the hook and the wire rope, should be tested. Components should be inspected for cracks. Only after confirming that all connections meet the requirements can the paving be lifted to the transport height. Two workers should manually hold the prefabricated paving panel to ensure it is upright and stable before installation. Paving work proceeds from the corners of the well site towards the center. The various processes are smoothly connected, construction equipment is centralized, there is no waste disposal during installation, minimizing environmental impact. Compared to traditional cast-in-place concrete construction at well sites, this method shortens curing time, significantly reduces overall construction time, lowers construction costs, and creates a clean and orderly site, providing a timely well site platform for deep drilling development.

[0148] For well sites with a depth of 10,000 meters and a large area, base layer solidification can improve the effective paving site conditions for prefabricated slabs. Its base layer petrochemical solidification can be adjusted according to the soil conditions of different sites, and is applicable to various base layers. It is beneficial for complex soils in multiple areas to achieve the paving conditions for slabs.

[0149] Example 8

[0150] As another example of this invention, in the Weiyuan Zizhong shale gas well site area (closed construction), this invention was applied to six pre-drilling projects in the Wei 202 and Wei 204 blocks of the gas area, with a site panel installation area of ​​10,881 square meters. A construction method for a prefabricated composite site for oil and gas drilling sites differs from Example 6 in that: compared to the steps in Example 6—site panel prefabrication, base layer curing, and gap treatment between panels—the actual application includes the following steps:

[0151] Step 1: Precast concrete slab panels. The slab panels were custom-sized with a length-to-width ratio of 1:1. The corner guards were not considered around the perimeter of the panels, and the panels were not textured at the top and bottom.

[0152] Step Two: Construction of the Clay Petrochemical Base Course. This block adopts an environmentally friendly prefabricated composite structure construction for the heavy-load zone of the original soil base course with a moisture content of 22%. The fill material of the drilling site base course is treated with 5% soil water-reducing powder and 2% soil stabilizing liquid. The drilling site base course is excavated into the base course using an excavator to a depth of approximately 0.6m (including 10cm of the base course formed by mixing with the soil stabilizing liquid).

[0153] Step 3: Lay the felt geotextile.

[0154] Step 4: Lay a sand buffer layer.

[0155] Step 5: Field panel installation.

[0156] Step 6: Use rubber pads to seal the gaps.

[0157] Because corner protection for the boards was not considered, edge damage caused by collisions during transportation and installation was found around the board's perimeter during actual use. This damage did not affect the board's reusability or load-bearing capacity, but it did affect its aesthetics. Rubber pads were used on-site to effectively prevent collision damage between the installed boards. The installation of the rubber pads included: ① The caulking rubber was an elastic material, 8mm thick, used between adjacent boards and remained in the joint. It maintained the joint width and prevented damage from friction between adjacent boards. ② The caulking rubber was cut into 15cm wide strips and placed between the installed board and the board to be installed, with the installation depth matching the board thickness. The height difference between adjacent boards could be checked and compared using the rubber thickness. ③ After the board installation and positioning were completed, the rubber was cut along the inner edge of the joint with a knife, ensuring the rubber height did not exceed the inner edge of the joint.

[0158] Example 9

[0159] As another example of this invention, it is applied in drilling sites in the Shunan gas field, such as Zi 232 and Zi 231. A construction method for a prefabricated composite well site for oil and gas drilling sites differs from Example 6 in that the pre-drilling earthwork balance excavation and filling work in this gas area is large, affecting the entire drilling construction cycle. Due to the implementation of this invention, the construction period is increased by 43% compared with the traditional cast-in-place concrete well site construction, which greatly shortens the entire pre-drilling construction period and provides favorable conditions for the drilling rig to enter the site. This invention is an environmentally friendly prefabricated composite well site structure. The structure includes, from bottom to top, a clay petrochemical solidified soil base layer, an anti-seepage structural layer, a sand and gravel buffer layer, and a prefabricated well panel. Compared with a single prefabricated well panel structure, the structure is more stable and the equipment transportation and use are safer and more reliable in the high-fill well site of the Weiyuan Zizhong shale gas area.

[0160] The above description is not intended to limit the present invention in any way, but is intended to illustrate that the present invention can be implemented or used by those skilled in the art through the above embodiments. Equivalent embodiments with changes or modifications to the above embodiments will be obvious to those skilled in the art. Therefore, the present invention includes, but is not limited to, the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for prefabricated composite surfaces used in oil and gas drilling sites, characterized by: The construction method includes the following steps. S1. Precast concrete panel; S2, Construction of clay petrochemical base layer; The specific construction method for the clay petrified base layer is as follows: S201. Before earthwork operations at the well site, the clay should be cleared and piled up, and then the earthwork leveling operation at the well site should be carried out. S202. Analyze the clay and, based on its moisture content, formulate a treatment formula and design the base layer thickness. S203. Spread the clay piled up in step S201 evenly on the well site. According to the treatment formula set in step S202, add soil stabilizing liquid to the clay and mix evenly. The dosage of soil stabilizing liquid is 1% to 2% of the clay weight. S204. Monitor the moisture content of the soil mixed in step S203, and determine the amount of water-reducing powder based on the detected moisture content; the amount of water-reducing powder is determined according to the required reduction in moisture content, and 1% of the clay content of water-reducing powder is added for every 1.5% reduction in moisture content. S205. According to the amount of water-reducing powder determined in step S204, weigh the water-reducing powder, add it to the soil mixed in step S203, and add a certain proportion of cement, the amount of cement being 4% to 8% of the clay content; and mix thoroughly. S206. Spread the mixture after thorough mixing in step S205 onto the surface after step S201. S207. First, use a road roller for static compaction, then start vibratory compaction. S3. Lay the impermeable layer. After completing the construction of the clay petrochemical base layer, lay the impermeable layer on the clay petrochemical base layer. S4. Lay a buffer layer by mixing dry-mixed rubber granule mortar with cement, sand and rubber granules in a ratio of 1:(2.5~4.5):1 as the buffer layer material; after the impermeable layer is laid, lay the buffer layer on top of the impermeable layer. S5. Installation of the field panel: After step S4 is completed, the precast concrete field panel from step S1 is transported to the well site for assembly. S6. Filling the joints with dry-mixed rubber granule mortar: After the panel assembly is completed, use dry-mixed rubber granule mortar to fill the joints between the panels. Mix cement, sand and rubber granules in a ratio of 1:(2.5~4.5):

1. Manually fill the joints and flatten the surface. Use a trowel to check the density of the joints. The mortar should not leak after the trowel is inserted and removed.

2. The construction method for prefabricated composite surfaces for oil and gas drilling sites as described in claim 1, characterized in that: The soil stabilizing liquid agent is YJ-1 or YJ-2, the water-reducing powder agent is FJ-1 or FJ-2, and the cement is 425 grade cement.

3. The construction method for prefabricated composite surfaces for oil and gas drilling sites as described in claim 1, characterized in that: In step S207, a 18-22 ton road roller is used to first perform static compaction once, followed by vibratory compaction, and then the process is repeated 5 times.

4. The construction method for a prefabricated composite site for oil and gas drilling sites as described in any one of claims 1-3, characterized in that: The specific method for prefabricating the concrete slab is as follows: S101. Make molds: According to the specifications of the concrete slab, make precast molds for the concrete slab. S102. Fabrication of steel reinforcement cage: The steel reinforcement cage is tied point by point, and corner protection components are welded at the four corners. S103. Embedded hangers: Multiple hangers are symmetrically embedded on the patterned surface of the panel and multiple hangers are embedded on the long side of the panel. All hangers are tied to the steel reinforcement skeleton. S104. Set the wear-resistant layer. Spread the wear-resistant material evenly on the bottom mold of the precast mold made in step S101, and then pour cement slurry onto the wear-resistant material. S105. Structural layer concrete pouring: After the cement slurry of the wear-resistant layer has initially set, pour the structural layer concrete on the wear-resistant layer, and vibrate and slurry to finish the surface. S106. Set up an anti-slip layer. After the structural layer concrete has initially set, use a special tool to pull strips on the upper surface of the structural layer concrete as an anti-slip layer for the pavement. S107. Curing and maintenance of the field panel: After the pouring is completed, use steam for continuous and uninterrupted curing for no less than 8 hours. After curing, transport it to the stockyard for further curing.

5. The construction method for prefabricated composite surfaces for oil and gas drilling sites as described in claim 4, characterized in that: The specifications of the scene include heavy-duty plates and light-duty plates. The aspect ratio of the heavy-duty plates is 1:1, and the aspect ratio of the light-duty plates is 1:

2.

6. The construction method for prefabricated composite surfaces for oil and gas drilling sites as described in claim 4, characterized in that: In step S101, when making the precast mold for the concrete field panel, the bottom mold is made of a steel plate with raised texture, the side mold is made of channel steel, the long side mold is equipped with tie holes, and the side mold is fixed by tie rods.

7. The construction method for prefabricated composite surfaces for oil and gas drilling sites as described in claim 4, characterized in that: In step S104, the thickness of the cement grout poured is the same as the thickness of the wear-resistant material.

8. The construction method for a prefabricated composite site for oil and gas drilling sites as described in any one of claims 1-3, characterized in that: The specific method for laying the S3 step impermeable layer is as follows: S301. Level the clay petrochemical base plane of step S2, and use medium or fine sand to level any uneven parts. S302. Felt waterproof geotextile is used as the seepage prevention layer. The geotextiles are connected by welding, and double welds are set at the overlap. The width of the double welds is not less than 2mm×10mm. A T-shaped staggered welding form is adopted, and the misalignment between transverse welds is greater than or equal to 500mm.

9. The construction method for a prefabricated composite site for oil and gas drilling sites as described in any one of claims 1-3, characterized in that: In step S4, when laying the buffer layer, place a laser level in both the longitudinal and transverse directions of the board, and lay the buffer layer with a thickness of 50mm.

10. The construction method for a prefabricated composite site for oil and gas drilling sites as described in any one of claims 1-3, characterized in that: In step S5, the specific installation and construction of the field panel is as follows: S501. First, lay out the installation location on paper and design the connection with the equipment foundation; plan the heavy load area and light load area, and the starting and ending points of the plate assembly should be 300mm~500mm away from the well site clear water ditch wall. S502. Place a laser level at each end of the long side of the field panel to control the assembly height of the field panel. S503. Use horizontal hoisting to ensure that the panels are placed stably at the installation point when they are in place, and control the gap width between the panels to be 10mm~15mm. S504. The unassembled parts at the well site's clear water ditch were filled in with concrete.

11. The construction method for a prefabricated composite site for oil and gas drilling sites as described in any one of claims 1-3, characterized in that: When dismantling the field panels, the field panels are first slowly hoisted to loosen the mortar. After the dry-mixed rubber granule mortar in the mortar is loosened, the mortar material around the field panels is cleaned. After the mortar material is cleaned, the field panels are hoisted onto the transport vehicle. Then, the dry-mixed rubber granule mortar of the buffer layer is collected into a pile, and the seepage prevention layer is cut and collected into rolls and transported to the next project for use, and the land at the well site is returned to cultivation.

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