A method for integrated production increase and carbon storage transformation of unconventional oil and gas resources

Abstract

The present invention relates to the field of oil and gas resource development, and specifically to a method for integrated production increase and carbon storage of unconventional oil and gas resources, comprising the following steps: drilling horizontally arranged directional wells and vertically arranged directional wells in the target transformation area to form a slurry delivery channel; mixing ultrafine cement powder, a coagulant, a foaming agent, and a foam stabilizer with distilled water to obtain an intermediate product; injecting the base liquid and the intermediate product into a No. II mixing tank under a CO2 atmosphere, and continuously stirring to obtain a transformation slurry; the transformation slurry is used to split the formation through holes on the casing in the slurry delivery channel; the transformation slurry is solidified to form a water-stopping and heat-insulating layer; constructing an extraction well from the surface to the reservoir, heating the reservoir, and simultaneously using surface extraction equipment to extract the oil and gas resources. The present invention simultaneously solves the problems of large heat energy loss and groundwater intrusion during the extraction of such resources, as well as the problem of easy leakage of CO2 underground storage.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas resource development, and in particular to a method for integrated production increase and carbon storage transformation of unconventional oil and gas resources. Background Art

[0002] my country is rich in medium- and low-maturity unconventional oil and gas resources. If these medium- and low-maturity unconventional oil and gas resources can be fully developed and utilized, it will be of great strategic significance for alleviating energy shortages, improving energy utilization and maintaining national energy security.

[0003] However, groundwater intrusion, leading to formation collapse and significant heat loss, are major bottlenecks currently facing the in-situ development of low- and medium-maturity unconventional oil and gas. Existing reservoir modification methods struggle to address these issues, including poor water-stopping and thermal insulation. Furthermore, among existing modification technologies aimed at achieving carbon neutrality, conventional underground CO2 storage relies solely on dissolution, binding, and adsorption, making it difficult to avoid CO2 leakage. Summary of the Invention

[0004] In order to simultaneously solve the problems of groundwater intrusion into the stratum during the exploitation of such resources, resulting in collapse and large heat energy loss, as well as the problem of easy leakage during the underground storage of CO2, the present invention provides the following technical solutions:

[0005] A method for integrated production increase and carbon storage of unconventional oil and gas resources, comprising the following steps:

[0006] Step 1: Set up a directional drilling rig on the surface above the target transformation area and conduct directional drilling. Drill several horizontally arranged directional wells in the cap and underlying layers at a depth of 10-20m from the target reservoir. Simultaneously, drill several vertically arranged directional wells within the reservoir to be mined, and add fixed directional wells to form a stable slurry transportation channel.

[0007] Step 2: preparing a transformation slurry, which includes the following components in parts by weight: 15-70 parts of ultrafine cement powder, 5-20 parts of a coagulant, 0-5 parts of a foaming agent, 0-5 parts of a foam stabilizer, and an appropriate amount of distilled water;

[0008] Step 3: The reforming slurry is injected into the slurry conveying channel at a pressure of 1 MPa through the slurry injection module. When the reforming slurry fills all the slurry conveying channels, the injection pressure is set to a value higher than the reservoir ground stress, so that the reforming slurry passes through the holes on the casing in the slurry conveying channel to split the formation. As the reforming slurry is continuously injected at high pressure, a slurry diffusion area is formed near the slurry conveying channel.

[0009] Step 4. After the injection of the reformed slurry is completed, wait until the reformed slurry in the slurry diffusion area has been solidified to form a circle of water-stopping and heat-insulating layer; at this time, construct a mining well from the surface to the reservoir, and place the downhole heater in the mining module into the downhole reservoir, turn on the downhole heater to heat the reservoir, and at the same time use the ground mining device to mine oil and gas resources through the mining well. When the output rate is lower than the predetermined value, the reservoir is deemed to be mined, the relevant ground equipment is removed and go to the next target reservoir to restart the next working cycle.

[0010] As a further solution of the present invention: the detailed steps of preparing the transformation slurry are as follows: ultrafine cement powder and distilled water are added to the base liquid A stirring tank at a mass ratio of 3:1 and 1:3 respectively, and the stirring is continued at a speed of 120 revolutions per minute; a coagulant and distilled water are added to the base liquid B stirring tank at a mass ratio of 1:1 and 1:5 respectively, and the stirring is continued at a speed of 240 revolutions per minute; a foaming agent and distilled water are added to the base liquid C stirring tank at a mass ratio of 1:3 and 1:10 respectively, and the stirring is continued at a speed of 480 revolutions per minute; a foaming agent and distilled water are added to the base liquid D stirring tank at a mass ratio of 1:1 and 1:10 respectively, and the stirring is continued at a speed of 480 revolutions per minute; a foaming agent and distilled water are added to the base liquid D stirring tank at a mass ratio of 1:1 and 1:10 respectively, and the stirring is continued at a speed of 500 revolutions per minute. :3 and 1:10, respectively, adding a foam stabilizer and distilled water, and continuously stirring at a speed of 480 revolutions per minute; after sufficient stirring, injecting the base liquid in the base liquid B stirring tank, the base liquid C stirring tank and the base liquid D stirring tank into the stirring tank No. Ⅰ for stirring to obtain an intermediate product; turning on the switch between the carbon dioxide gas tank and the stirring tank No. Ⅱ to maintain a CO2 atmosphere inside the stirring tank No. Ⅱ; then injecting the base liquid in the base liquid A stirring tank and the intermediate product in the stirring tank No. Ⅰ into the stirring tank No. Ⅱ, and continuously stirring at a speed of 120 revolutions per minute, and continuously stirring for 15 minutes after mixing, to obtain a transformed slurry.

[0011] As a further solution of the present invention: the median particle size of the ultrafine cement powder is between 3 and 6 microns.

[0012] As a further embodiment of the present invention, the coagulant includes one or more of water glass (sodium silicate, potassium silicate), chlorides (sodium chloride, calcium chloride), nitrates (sodium nitrate, calcium nitrate), nitrites (sodium nitrite, calcium nitrite), sulfates (sodium sulfate, aluminum sulfate), and carbonates (sodium carbonate, sodium bicarbonate).

[0013] As a further solution of the present invention: the foam stabilizer includes one or more of macromolecular substances (polyacrylamide, polyvinyl alcohol, protein, polypeptide, starch, cellulose, etc.), silicone resin polyether emulsions (MPS), non-ionic surfactants (dodecyl dimethyl amine oxide, alkyl alcohol amide), aliphatic substances, etc.

[0014] As a further solution of the present invention: the foaming agent includes one or more of anionic surfactants, cationic surfactants, nonionic surfactants, animal proteins and plant proteins.

[0015] As a further solution of the present invention: a transformation system is adopted in the transformation method, and the transformation system includes a slurry configuration module, a slurry injection module and a mining module. Each module is placed on the ground directly above the transformation area. The slurry configuration module is connected to the slurry injection module, and the slurry injection module and the mining module both have well parts deep underground.

[0016] As a further solution of the present invention: the slurry configuration module includes a base liquid A stirring tank, a base liquid B stirring tank, a base liquid C stirring tank, a base liquid D stirring tank, a carbon dioxide gas tank, a stirring tank No. Ⅰ and a stirring tank No. Ⅱ; the liquid outlets of the base liquid B stirring tank, the base liquid C stirring tank and the base liquid D stirring tank are all connected to the liquid inlet of the stirring tank No. Ⅰ, the liquid outlets of the base liquid A stirring tank and the No. Ⅰ stirring tank are connected to the liquid inlet of the No. Ⅱ stirring tank, and the gas outlet of the carbon dioxide gas tank is connected to the gas inlet of the No. Ⅱ stirring tank.

[0017] As a further solution of the present invention: the slurry injection module includes a directional drilling rig, a casing, a slurry delivery channel and a high-pressure grouting screw pump, and the liquid outlet of the No. II mixing tank is connected to the high-pressure grouting screw pump.

[0018] As a further solution of the present invention: the mining module includes a production well, a surface mining device and a downhole heater.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention uses a reformed slurry to split the area near the medium- and low-maturity unconventional oil and gas resource reservoir. Since the main body of the reformed slurry is a cement skeleton, it has good mechanical strength. During the target reservoir mining process, it can ensure the stability of the internal stress state of the reservoir and prevent the backflow of groundwater around the reservoir caused by reservoir mining, thereby increasing mining efficiency.

[0021] 2. The present invention uses a reformed slurry to split the area near the medium- and low-maturity unconventional oil and gas resource reservoirs. Since the solidified body of the reformed slurry has good porosity characteristics, the solidified body has an excellent thermal insulation effect. During the target reservoir exploitation process, the heat generated can be always trapped inside the reservoir, thereby improving energy utilization and increasing reservoir exploitation efficiency.

[0022] 3. During the mixing process of the various components of the reforming slurry, since it is continuously in a CO2 atmosphere, the CO2 gas can form carbonic acid through diffusion, dissolution and hydration. The carbonic acid is ionized into hydrogen ions and bicarbonate ions in the liquid phase, and then reacts with unhydrated tricalcium silicate and dicalcium silicate to produce silica gel and calcium carbonate. On the one hand, it fills the bubbles inside the reforming slurry and the pores in the consolidated body, and on the other hand, it strengthens the overall strength of the consolidated body, and ultimately achieves the mineralization and storage of CO2.

[0023] 4. The reaction principle of the present invention is simple, the engineering process is not complicated, and the reaction raw materials are commonly used industrial raw materials with low prices, which meets the mining industry's needs for high efficiency, economy and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the transformation system used in the integrated transformation method for increasing production and storing carbon of unconventional oil and gas resources in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of constructing a water-stopping and heat-insulating layer near a reservoir in an integrated method for increasing production and storing carbon for unconventional oil and gas resources according to an embodiment of the present invention.

[0026] Figure 3 1 is a stress-strain curve of a uniaxial compression test of Experimental Group 1 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0027] Figure 4 This is a photograph of samples from Experimental Group 1 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources according to an embodiment of the present invention.

[0028] Figure 5 This is a photograph of the sample of Experimental Group 1 before the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0029] Figure 6 This is a photograph of the sample of Experimental Group 1 after the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0030] Figure 7 1 is the stress-strain curve of the uniaxial compression test of Experimental Group 2 for the integrated transformation method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0031] Figure 8 This is a photograph of samples from Experimental Group 2 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0032] Figure 9This is a photograph of the sample of Experimental Group 2 before the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0033] Figure 10 This is a photograph of the sample of Experimental Group 2 after the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0034] Figure 11 1 is the stress-strain curve of the uniaxial compression test of Experimental Group 3 of the integrated transformation method for increasing production and storing carbon in unconventional oil and gas resources in the embodiment of the present invention.

[0035] Figure 12 This is a photograph of samples from Experimental Group 3 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0036] Figure 13 This is a photograph of the sample of Experimental Group 3 before the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0037] Figure 14 This is a photograph of the sample of Experimental Group 3 after the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0038] Figure 15 1 is the stress-strain curve of the uniaxial compression test of Experimental Group 4 of the integrated transformation method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0039] Figure 16 This is a photograph of samples from Experimental Group 4 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0040] Figure 17 This is a photograph of the sample of Experimental Group 4 before the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0041] Figure 18 This is a photograph of the sample of Experimental Group 4 after the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0042] Figure 19 1 is a stress-strain curve of a uniaxial compression test of Experimental Group 5 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0043] Figure 20 This is a photograph of samples from Experimental Group 5 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0044] Figure 21 This is a photograph of the sample of Experimental Group 5 before the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0045] Figure 22 This is a photograph of the sample of Experimental Group 5 after the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0046] Figure 23 1 is the stress-strain curve of the uniaxial compression test of Experimental Group 6 for the integrated transformation method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0047] Figure 24 This is a photograph of samples from Experimental Group 6 of the integrated method for increasing production and storing carbon for unconventional oil and gas resources in an embodiment of the present invention.

[0048] Figure 25 This is a photograph of the sample of Experimental Group 6 before the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0049] Figure 26 This is a photograph of the sample of Experimental Group 6 after the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0050] Figure 27 1 is the stress-strain curve of the uniaxial compression test of Experimental Group 7 for the integrated transformation method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0051] Figure 28 This is a photograph of samples from Experimental Group 7 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0052] Figure 29 This is a photograph of the sample of Experimental Group 7 before the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0053] Figure 30 This is a photograph of the sample of Experimental Group 7 after the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources according to an embodiment of the present invention.

[0054] Figure 31 1 is a stress-strain curve of a uniaxial compression test of Experimental Group 8 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0055] Figure 32This is a photograph of samples from Experimental Group 8 of the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0056] Figure 33 This is a photograph of the sample of experimental group 8 before the uniaxial compression test in the integrated production increase and carbon storage modification method for unconventional oil and gas resources in an embodiment of the present invention.

[0057] Figure 34 This is a photograph of the sample of Experimental Group 8 after the uniaxial compression test in the integrated method for increasing production and storing carbon in unconventional oil and gas resources in an embodiment of the present invention.

[0058] In the figure: 1-base liquid A mixing tank, 2-base liquid B mixing tank, 3-base liquid C mixing tank, 4-base liquid D mixing tank, 5-carbon dioxide gas tank, 6-No. I mixing tank, 7-No. II mixing tank, 8-directional drilling rig, 9-casing, 10-slurry conveying channel, 11-high-pressure grouting screw pump, 12-mining well, 13-surface mining device, 14-downhole heater. DETAILED DESCRIPTION

[0059] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0060] Another object of the present invention is to provide an integrated production increase and carbon storage system for medium- and low-maturity unconventional oil and gas resources. Another object of the present invention is to provide a formulation and configuration method of a transformation slurry, which has the functions of heat insulation, water stopping and carbon storage.

[0061] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0062] Example 1, reference Figure 1-Figure 2 The embodiment of the present invention provides a method for integrated production increase and carbon storage of unconventional oil and gas resources, comprising the following steps:

[0063] Step 1: A directional drilling rig 8 is set up on the surface above the target transformation area of ​​medium-low maturity unconventional oil and gas resources, and directional drilling is carried out using the directional drilling rig 8. Several horizontally arranged directional wells are drilled in the cap rock and the underlying layer at a depth of 10-20 meters from the target reservoir. At the same time, several vertically arranged directional wells are drilled within the reservoir range to be mined, and these directional wells are reinforced with perforated casing 9 to form a stable slurry transportation channel 10.

[0064] Step 2: Ultrafine cement powder and distilled water are added to the base liquid A mixing tank 1 in a mass ratio of 3:1 and 1:3, and the mixture is continuously stirred at a speed of 120 revolutions per minute; a coagulant and distilled water are added to the base liquid B mixing tank 2 in a mass ratio of 1:1 and 1:5, and the mixture is continuously stirred at a speed of 240 revolutions per minute; a foaming agent and distilled water are added to the base liquid C mixing tank 3 in a mass ratio of 1:3 and 1:10, and the mixture is continuously stirred at a speed of 480 revolutions per minute; a foam stabilizer and distilled water are added to the base liquid D mixing tank 4 in a mass ratio of 1:3 and 1:10, and the mixture is continuously stirred at a speed of 480 revolutions per minute; after sufficient stirring, the base liquids in the base liquid B mixing tank 2, the base liquid C mixing tank 3, and the base liquid D mixing tank 4 are injected into the No. 1 mixing tank 6 for stirring to obtain an intermediate product;

[0065] Step 3: Open the switch between the carbon dioxide gas tank 5 and the No. 2 stirring tank 7 to maintain a CO2 atmosphere inside the No. 2 stirring tank 7; then, inject the base liquid in the base liquid A stirring tank 1 and the intermediate product in the No. 1 stirring tank 6 into the No. 2 stirring tank 7, respectively, and continuously stir at a speed of 120 revolutions per minute. After mixing, continue stirring for 15 minutes to obtain a reformed slurry, which includes the following components in parts by weight: 50 parts of ultrafine cement powder, 20 parts of a coagulant, 0.5 parts of a foaming agent, and 0.5 parts of a foam stabilizer;

[0066] Step 4: The reformed slurry that has been thoroughly stirred in the No. II mixing tank 7 is injected into the slurry delivery channel 10 at a pressure of 1 MPa through the high-pressure grouting screw pump 11 in the slurry injection module. When the reformed slurry fills all the slurry delivery channels 10, the injection pressure of the high-pressure grouting screw pump 11 is set to a value higher than the reservoir ground stress, so that the reformed slurry passes through the holes on the casing 9 in the slurry delivery channel 10 to split the formation. As the reformed slurry is continuously injected at high pressure, a slurry dispersion area can be formed near the slurry delivery channel 10.

[0067] Step five: After the injection of the reformed slurry is completed, wait for 48 hours. At this time, the reformed slurry in the slurry diffusion area near the slurry conveying channel 10 has been solidified to form a circle of water-stopping and heat-insulating layer; at this time, use the directional drilling rig 8 to construct a mining well from the surface to the reservoir, and put the downhole heater 14 in the mining module into the downhole reservoir, turn on the downhole heater 14, heat the reservoir, and use the ground mining device 13 to mine oil and gas resources through the mining well. When the output rate is lower than the predetermined value, the reservoir is deemed to be mined, the ground-related equipment is removed and the next target reservoir is moved to restart the next working cycle.

[0068] The above-mentioned transformation method uses an integrated transformation system for increasing production and storing carbon in low- to medium-maturity unconventional oil and gas resources, including a slurry configuration module, a slurry injection module, and a production module. Each module is placed on the ground directly above the transformation area. The slurry configuration module is connected to the slurry injection module. Both the slurry injection module and the production module have well sections that extend deep underground.

[0069] The slurry configuration module includes a base liquid A stirring tank 1, a base liquid B stirring tank 2, a base liquid C stirring tank 3, a base liquid D stirring tank 4, a carbon dioxide gas tank 5, a No. I stirring tank 6, and a No. II stirring tank 7;

[0070] The liquid outlets of the base liquid B stirring tank 2, the base liquid C stirring tank 3, and the base liquid D stirring tank 4 are all connected to the liquid inlet of the No. 1 stirring tank 6, the liquid outlets of the base liquid A stirring tank 1 and the No. 1 stirring tank 6 are all connected to the liquid inlet of the No. 2 stirring tank 7, and the gas outlet of the carbon dioxide gas tank 5 is connected to the gas inlet of the No. 2 stirring tank 7;

[0071] The slurry injection module includes a directional drill 8, a casing 9, a slurry delivery channel 10 and a high-pressure grouting screw pump 11;

[0072] The liquid outlet of the No. II stirring tank 7 in the slurry configuration module is connected to the high-pressure grouting screw pump 11 in the slurry injection module;

[0073] The mining module includes a mining well 12 , a surface mining device 13 and a downhole heater 14 .

[0074] CO2 gas forms carbonic acid through diffusion, dissolution and hydration. Carbonic acid ionizes into hydrogen ions and bicarbonate ions in the liquid phase, which then react with unhydrated tricalcium silicate and dicalcium silicate to form silica gel and calcium carbonate, achieving the mineralization and storage of CO2. The essence and mechanism of the reaction are shown in the following chemical equation:

[0075] (1) Reaction of unhydrated calcium silicate with CO2:

[0076]

[0077] (2) Reaction of hydration products with CO2:

[0078] .

[0079] Eight groups of experiments were conducted, and the experimental details are as follows:

[0080] The experimental instruments include the following:

[0081] Constant speed digital blade stirrer, maximum stirring volume: 20 L; power: 72 W; speed range: 100-2000 rpm; maximum torque: 20 N·cm; maximum viscosity: 5 000 mPa·s; allowable ambient temperature: 5-40 ℃, used for stirring.

[0082] High-precision electronic balance, brand: Ji Ming; graduation value: 0.01 g; scale pan size: 24*19*7 cm; weight: 3 kg, used to weigh the mass of each component.

[0083] Constant temperature and humidity curing chamber, control accuracy: 60±1℃; compressor power: 145 W; internal dimensions: 60 cm*50 cm*113 cm; humidity control: ≥90%; heating power: 1000 W; operating voltage: 220 V, used for curing consolidated body specimens.

[0084] The DDL100 high-temperature electronic universal testing machine has a temperature range of 20-800°C, a maximum test force of 100 kN, force measurement accuracy of ±0.5% of the indicated value within the range of 0.4% to 100% of the load cell capacity, crosshead displacement measurement with a resolution better than 0.001 mm, a stepless crosshead speed range of 0.005 to 500 mm / min, displacement speed accuracy better than ±0.5% (no-load, detection distance greater than 20 mm), speed load capacity with a maximum allowable load of less than 50 mm / min, a test space width of 540 mm, and a clamping range of Ø8 to Ø22. It is used to measure the compressive strength of consolidated specimens.

[0085] The experimental method is as follows: Ultrafine cement powder, coagulant, foaming agent, and foam stabilizer are weighed in proportion by weight. The coagulant, foaming agent, and foam stabilizer are mixed evenly to obtain a mixing liquid. The weighed ultrafine cement powder is gradually added to the mixing liquid and stirred until a uniform state is achieved, thereby obtaining the cement material. A mixing cup filled with the required amount of distilled water is placed on a table to ensure stability. The motor is then started and maintained at a speed of 800 rpm. After confirming that the motor is operating normally, the cement material is gradually added to the mixing cup. As the cement material is gradually added, it is observed to ensure that it is fully dispersed in the distilled water. Once all the cement material is completely dispersed in the distilled water, a reforming slurry is obtained. The quartz sand material is gradually added and stirred continuously until the quartz sand is completely and evenly dispersed in the reforming slurry. During the stirring process, ensure that the quartz sand is gradually incorporated into the reforming slurry to avoid lumps or uneven distribution. The stirring process requires careful observation until the quartz sand is fully and evenly mixed with the reforming slurry. Then continue stirring at 1000 r / min for 2 min to obtain the sample slurry. The sample mold is filled with 25mm×50mm sample slurry to ensure that it is full. Then, the filled sample mold is placed under a pressure of 0.1 MPa and the temperature is controlled to maintain the predetermined temperature of the reservoir. Under this temperature and pressure condition, the sample is cured to maintain its stable solidification state in the sample mold. The curing time lasts for 24 hours to ensure that the sample slurry is fully solidified and hardened. Take out The sample in the 25mm×50mm specimen mold ensures that the sample is intact after being taken out. Subsequently, the sample is placed in the DDL100 high-temperature electronic universal testing machine in preparation for subsequent mechanical property testing. Before placing the sample in the DDL100 high-temperature electronic universal testing machine, it is necessary to confirm that its position is correct to ensure the accuracy and reliability of the test results. The main function of the coagulant is to adjust the solidification time of the slurry. In view of the different actual solidification times required during the injection process in actual applications, the content of the coagulant is adjusted in the experiment to ensure that the solidification time of the samples under each formula is at least greater than 2 hours. It has no significant effect on the permeability and mechanical strength of the solidified body. The experimental group without coagulant only has a longer solidification time.

[0086] Experimental group 1: The components of the modified slurry are shown in Table 1, and the coagulant is sodium silicate in water glass.

[0087] Table 1 Formula of modified slurry

[0088] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 1 100g 300g 30g 10g 0g 0g

[0089] The stress-strain curve of the uniaxial compression test of experimental group 1 is shown in Figure 3 , Figure 3 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 4 This is a photo of the sample of experimental group 1. Figure 5 This is a photo of the sample of experimental group 1 before the uniaxial compression test. Figure 6 This is a photo of the specimen in experimental group 1 after the uniaxial compression test. Figure 3 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 15.035 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0090] The permeability test was performed on the samples of experimental group 1, and the test results are shown in Table 2.

[0091] Table 2 Permeability of samples under different confining pressures

[0092]

[0093] As shown in Table 2, the sample from Experimental Group 1 maintains good porosity even under high formation pressure, with a maximum permeability of 9436.66 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0094] Experimental Group 2: The components of the modified slurry are shown in Table 3, and the coagulant is aluminum sulfate among sulfates.

[0095] Table 3 Formula of modified slurry

[0096] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 2 100g 300g 30g 20g 0g 0g

[0097] The stress-strain curve of the uniaxial compression test of experimental group 2 is shown in Figure 7 , Figure 7 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 8 This is a photo of the sample of experimental group 2. Figure 9 This is a photo of the sample of experimental group 2 before the uniaxial compression test. Figure 10 This is a photo of the specimens of experimental group 2 after the uniaxial compression test. Figure 7 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 4.554 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0098] The permeability test was performed on the samples of experimental group 2, and the test results are shown in Table 4.

[0099] Table 4 Permeability of samples under different confining pressures

[0100]

[0101] Table 4 shows that the sample from Experimental Group 2 maintains good porosity even under high formation pressure, with a maximum permeability of 14,987.65 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0102] Experimental group 3: The components of the modified slurry are shown in Table 5. The coagulant is calcium chloride in chloride salt, the foaming agent is an anionic surfactant, and the foam stabilizer is a macromolecular substance.

[0103] Table 5 Formula of modified slurry

[0104] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 3 100g 300g 30g 10g 0.2g 0.1g

[0105] The stress-strain curve of the uniaxial compression test of experimental group 3 is shown in Figure 11 , Figure 11 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 12 This is a photo of the sample of experimental group 3. Figure 13 This is a photo of the sample of experimental group 3 before the uniaxial compression test. Figure 14 This is a photo of the specimen of experimental group 3 after the uniaxial compression test. Figure 11 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 0.537 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0106] The permeability test was performed on the samples of experimental group 3, and the test results are shown in Table 6.

[0107] Table 6 Permeability of samples under different confining pressures

[0108]

[0109] As shown in Table 6, the sample from Experimental Group 3 maintains good porosity even under high formation pressure conditions, with a maximum permeability of 23162.73 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0110] Experimental Group 4: The components of the modified slurry are shown in Table 7. The coagulant is calcium nitrate from nitrate, the foaming agent is silicone resin polyether emulsion, and the foam stabilizer is a nonionic surfactant.

[0111] Table 7 Formula of modified slurry

[0112] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 4 100g 300g 30g 10g 0.1g 0.3g

[0113] The stress-strain curve of the uniaxial compression test of experimental group 4 is shown in Figure 15 , Figure 15 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 16 This is a photo of the sample of experimental group 4. Figure 17 This is a photo of the sample of experimental group 4 before the uniaxial compression test. Figure 18 This is a photo of the specimen of experimental group 4 after the uniaxial compression test. Figure 15 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 2.174 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0114] The permeability test was performed on the samples of experimental group 4, and the test results are shown in Table 8.

[0115] Table 8 Permeability of samples under different confining pressures

[0116]

[0117] Table 8 shows that the sample from Experimental Group 4 maintains good porosity even under high formation pressure, with a maximum permeability of 4852.44 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0118] Experimental Group 5: The components of the modified slurry are shown in Table 9. The coagulant is calcium nitrite in nitrite, the foaming agent is a cationic surfactant, and the foam stabilizer is a macromolecular substance.

[0119] Table 9 Formula of modified slurry

[0120] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 5 100g 300g 30g 10g 0.3g 0.3g

[0121] The stress-strain curve of the uniaxial compression test of experimental group 5 is shown in Figure 19 , Figure 19 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 20 This is a photo of the sample of experimental group 5. Figure 21 This is a photo of the sample of experimental group 5 before the uniaxial compression test. Figure 22 This is a photo of the specimen in experimental group 5 after the uniaxial compression test. Figure 19 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 0.321 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0122] The permeability test was performed on the samples of experimental group 5, and the test results are shown in Table 10.

[0123] Table 10 Permeability of samples under different confining pressures

[0124]

[0125] Table 10 shows that the sample in Experimental Group 5 maintains good porosity even under high formation pressure conditions, with a maximum permeability of 13772.44 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0126] Experimental Group 6: The components of the modified slurry are shown in Table 11.

[0127] Table 11 Formula of modified slurry

[0128] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 6 60g 300g 30g 0g 0g 0g

[0129] The stress-strain curve of the uniaxial compression test of experimental group 6 is shown in Figure 23 , Figure 23 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 24 This is a photo of the sample of experimental group 6. Figure 25 This is a photo of the sample of experimental group 6 before the uniaxial compression test. Figure 26 This is a photo of the specimen of experimental group 6 after the uniaxial compression test. Figure 23 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 21.866 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0130] The permeability test was performed on the samples of experimental group 6, and the test results are shown in Table 12.

[0131] Table 12 Permeability of samples under different confining pressures

[0132]

[0133] Table 12 shows that the sample from Experimental Group 6 maintains good porosity even under high formation pressure, with a maximum permeability of 3538.75 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0134] Experimental Group 7: The components of the modified slurry are shown in Table 13. The foaming agent is a macromolecular substance and the foam stabilizer is an aliphatic substance.

[0135] Table 13 Formula of modified slurry

[0136] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 7 60g 180g 150g 0g 0.1g 0.1g

[0137] The stress-strain curve of the uniaxial compression test of experimental group 7 is shown in Figure 27 , Figure 27 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 28 This is a photo of the sample of experimental group 7. Figure 29 This is a photo of the sample of experimental group 7 before the uniaxial compression test. Figure 30 This is a photo of the specimen of experimental group 7 after the uniaxial compression test. Figure 27 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 9.921 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0138] The permeability test was performed on the samples of experimental group 7, and the test results are shown in Table 14.

[0139] Table 14 Permeability of samples under different confining pressures

[0140]

[0141] Table 14 shows that the sample from Experimental Group 7 maintains good porosity even under high formation pressure conditions, with a maximum permeability of 2928.62 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0142] Experimental Group 8: The components of the modified slurry are shown in Table 15. The coagulant is sodium carbonate among carbonates, the foaming agent is animal protein, and the foam stabilizer is a nonionic surfactant.

[0143] Table 15 Formula of modified slurry

[0144] Group Liquid A Liquid A cement Liquid B water Liquid B coagulant Liquid B foaming agent Liquid B foam stabilizer 8 80g 240g 100g 5g 0.3g 0.3g

[0145] The stress-strain curve of the uniaxial compression test of experimental group 8 is shown in Figure 31 , Figure 31 The horizontal axis is the displacement of the sample, and the vertical axis is the stress at the corresponding moment. Figure 32 This is a photo of the sample of experimental group 8. Figure 33 This is a photo of the sample of experimental group 8 before the uniaxial compression test. Figure 34 This is a photo of the specimen in experimental group 8 after the uniaxial compression test. Figure 31 The strength characteristics of the formula sample can be clearly seen, and its uniaxial compressive strength is 6.645 MPa, which can ensure that it has good mechanical strength during the transformation process to form a high-strength skeleton to support the stratum.

[0146] The permeability test was performed on the samples of experimental group 8, and the test results are shown in Table 16.

[0147] Table 16 Permeability of samples under different confining pressures

[0148]

[0149] Table 16 shows that the sample from Experimental Group 8 maintains good porosity even under high formation pressure, with a maximum permeability of 2945.54 mD. Therefore, this sample exhibits excellent thermal insulation, ensuring that the generated heat is always trapped within the target reservoir during production, improving energy utilization and, consequently, increasing reservoir production efficiency.

[0150] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for integrated production increase and carbon storage of unconventional oil and gas resources, characterized in that: The following steps are involved: Step 1: Set up a directional drilling rig on the surface above the target transformation area and conduct directional drilling. Drill several horizontally arranged directional wells in the cap and underlying layers at a depth of 10-20m from the target reservoir. Simultaneously, drill several vertically arranged directional wells within the reservoir to be mined, and add fixed directional wells to form a stable slurry transportation channel. Step 2: preparing a transformation slurry, which includes the following components in parts by weight: 15-70 parts of ultrafine cement powder, 5-20 parts of a coagulant, 0-5 parts of a foaming agent, 0-5 parts of a foam stabilizer, and an appropriate amount of distilled water; Step 3: The reforming slurry is injected into the slurry conveying channel at a pressure of 1 MPa through the slurry injection module. When the reforming slurry fills all the slurry conveying channels, the injection pressure is set to a value higher than the reservoir ground stress, so that the reforming slurry passes through the holes on the casing in the slurry conveying channel to split the formation. As the reforming slurry is continuously injected at high pressure, a slurry diffusion area is formed near the slurry conveying channel. Step 4: After the injection of the reformed slurry is completed, wait until the reformed slurry in the slurry diffusion area has been solidified to form a circle of water-stopping and heat-insulating layer; at this time, construct a mining well from the surface to the reservoir, and place the downhole heater in the mining module into the downhole reservoir, turn on the downhole heater, and use the ground mining equipment to mine oil and gas resources.

2. The integrated method for increasing production and storing carbon in unconventional oil and gas resources according to claim 1, characterized in that: The detailed steps of preparing the transformation slurry are as follows: ultrafine cement powder and distilled water are added to a base liquid A mixing tank at a mass ratio of 3:1 and 1:3, respectively, and stirred continuously at a speed of 120 rpm; Add coagulant and distilled water to the base liquid B mixing tank at a mass ratio of 1:1 to 1:5, respectively, and continue stirring at 240 rpm; Add foaming agent and distilled water to the base liquid C mixing tank at a mass ratio of 1:3 to 1:10, respectively, and continue stirring at 480 rpm; Add foam stabilizer and distilled water to the base liquid D mixing tank at a mass ratio of 1:3 to 1:10, respectively, and continue stirring at 480 rpm. After sufficient stirring, the base liquids in the base liquid B stirring tank, the base liquid C stirring tank, and the base liquid D stirring tank are injected into the stirring tank No. 1 and stirred to obtain an intermediate product; Turn on the switch between the carbon dioxide gas tank and stirring tank No. 2 to maintain a CO2 atmosphere inside stirring tank No. 2; then inject the base liquid in the base liquid A stirring tank and the intermediate product in stirring tank No. 1 into stirring tank No. 2 respectively, and continue stirring at a speed of 120 revolutions per minute. After mixing, continue stirring for 15 minutes to obtain the transformed slurry.

3. The integrated method for increasing production and storing carbon for unconventional oil and gas resources according to claim 1 or 2, characterized in that: The median particle size of ultrafine cement powder is between 3-6 microns.

4. The integrated method for increasing production and storing carbon for unconventional oil and gas resources according to claim 1 or 2, characterized in that: The coagulant comprises one or more of water glass, chloride, nitrate, nitrite, sulfate and carbonate.

5. The integrated method for increasing production and storing carbon for unconventional oil and gas resources according to claim 1 or 2, characterized in that: The foaming agent includes one or more of anionic surfactants, cationic surfactants, nonionic surfactants, animal proteins and plant proteins.

6. The integrated method for increasing production and storing carbon for unconventional oil and gas resources according to claim 1 or 2, characterized in that: The foam stabilizer includes one or more of macromolecular substances, silicone resin polyether emulsions, nonionic surfactants and aliphatic substances.

7. The integrated method for increasing production and storing carbon for unconventional oil and gas resources according to claim 1, characterized in that: The transformation method adopts a transformation system, which includes a slurry configuration module, a slurry injection module and a mining module. Each module is placed on the ground directly above the target transformation area. The slurry configuration module is connected to the slurry injection module. The slurry injection module and the mining module both have well parts deep underground.

8. The integrated method for increasing production and storing carbon in unconventional oil and gas resources according to claim 7, characterized in that: The slurry configuration module includes a base liquid A stirring tank, a base liquid B stirring tank, a base liquid C stirring tank, a base liquid D stirring tank, a carbon dioxide gas tank, a stirring tank No. I and a stirring tank No. II; the liquid outlets of the base liquid B stirring tank, the base liquid C stirring tank and the base liquid D stirring tank are all connected to the liquid inlet of the stirring tank No. I, the liquid outlets of the base liquid A stirring tank and the No. I stirring tank are connected to the liquid inlet of the No. II stirring tank, and the air outlet of the carbon dioxide gas tank is connected to the air inlet of the No. II stirring tank.

9. The integrated method for increasing production and storing carbon in unconventional oil and gas resources according to claim 8, characterized in that: The slurry injection module includes a directional drilling rig, a casing, a slurry delivery channel and a high-pressure grouting screw pump, and the liquid outlet of the No. II mixing tank is connected to the high-pressure grouting screw pump.

10. The integrated method for increasing production and storing carbon in unconventional oil and gas resources according to claim 9 or 8, characterized in that: The production module includes a production well, a surface production device and a downhole heater.

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