Single vertical well water drive trona mine mining method

Abstract

The invention provides a single vertical well water drive trona mine mining method, and belongs to the technical field of geological development. The method comprises the steps that the tripping-in position of a packer is determined; connecting a central pipe and a packer and then putting the central pipe and the packer into a well; putting the central pipe into machine pumping equipment; hot water is injected through a central pipe and a sleeve annulus, mining is carried out through lifting equipment in the central pipe, continuous mining is achieved, meanwhile, injection-production parameters are adjusted, and production is regulated and controlled. The setting-in position of the packer determined by the method can effectively isolate the upper part and the lower part of an alkali ore layer, prevents substances at the upper part and the lower part from crossing each other, and is beneficial to the mining and utilization effects of alkali ore. According to the continuous mining mode provided by the invention, the production efficiency can be improved, and the production stop time is shortened, so that more stable production is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of geological development, and in particular relates to a single vertical well water-driven natural alkali ore mining method. Background Art

[0002] Trona is a soluble salt mineral because its main components, sodium carbonate and sodium bicarbonate, are not actually "bases" but "salts." It lacks the chemical molecular structure characteristic of an "alkali," but rather is an ionic compound composed of a strong alkali metal and a weak acid radical—a salt. However, when dissolved in water, these compounds produce a large number of hydroxide ions due to ionization and the interaction between the ions, making the aqueous solution alkaline. Furthermore, because it decomposes at temperatures above 400°C to produce sodium oxide, which has a similar effect to sodium hydroxide, it is commonly referred to in industry as "alkali." Furthermore, because high-purity sodium carbonate can be produced through artificial synthesis, it is named soda ash. In summary, non-metallic minerals whose main components are sodium carbonate and sodium bicarbonate are collectively referred to as trona.

[0003] There are three ways to mine natural soda ore, namely, shaft mining, solution mining and open-pit mining. Solution mining is based on the solubility of the mined material or ore. Dissolution is the selective or non-selective dissolution of soluble minerals in the ore deposit using water or other solvents to achieve the purpose of solution mining. Single-well water mining is a commonly used solution mining process, which has the advantages of simple system, simple process, low labor intensity and easy operation. The lower end of the casing opens to the upper part of the solution cavity, and the lower end of the center pipe opens to the bottom of the solution cavity. High-pressure hot water is injected by the casing, and the produced fluid is discharged from the center pipe. However, in this mining process, the contact area between the injection agent and the ore layer is low, the blind area of ​​ore layer mining is large, the sweep efficiency is low, and the degree of mining is low. Summary of the Invention

[0004] In response to the problems existing in the above-mentioned prior art, the present invention provides a single vertical well water-driven natural soda ore mining method. The technical problem to be solved by the present invention is to improve the sweep efficiency of the injection agent, increase the utilization rate of the natural soda ore, and achieve the purpose of increasing production and efficiency.

[0005] To solve the above technical problems, the present invention provides a single vertical well water flooding natural alkali ore mining method, comprising the following steps:

[0006] Step S1: Determine the running position of the packer;

[0007] Step S2: Connect the central pipe and the packer and lower them into the well;

[0008] Step S3: The central tube is lowered into the pumping equipment;

[0009] Step S4: hot water is injected into the annulus between the central pipe and the casing, and a lifting device is lowered into the central pipe to carry out mining, thereby achieving continuous mining. At the same time, injection and production parameters are adjusted to control production.

[0010] Furthermore, in step S1, the steps for determining the packer lowering position are as follows:

[0011] Step M1: select wells with alkali ore layer thickness greater than 3m for analysis;

[0012] Step M2: confirm the depth H and thickness h of the upper part of the alkali ore layer;

[0013] Step M3: The calculation formula for the packer lowering position is as follows:

[0014] L=(H+1 / 2h)

[0015] Where L is the depth of the packer lowering position.

[0016] Furthermore, in step S2, the steps of running the packer are as follows:

[0017] Step K1: Connect the central pipe and the packer, ensuring that they are lowered into the well at the same time;

[0018] Step K2: Apply butter to the outer surface of the packer's rubber sleeve to reduce the friction between the rubber sleeve and the wellbore wall, thereby making the packer's lowering smoother;

[0019] Step K3: Slowly and evenly lower the packer to the position determined in step S1;

[0020] Step K4: Set the packer according to the packer operating procedures to ensure that the packer is fixed in the wellbore.

[0021] Furthermore, in step S3, corresponding pumping equipment is selected and lowered according to the production capacity of the single well, the properties of the liquid, the depth and diameter of the well.

[0022] Furthermore, in step S4, the injection and production parameters include the injection rate, temperature and pressure of the hot water.

[0023] Furthermore, in step S4, the central tube and the casing annulus are first connected and sealed to prevent hot water leakage; then, hot water is injected into the central tube and the casing annulus, and the hot water enters the ore layer through the casing perforation section, and the natural soda ore is extracted along with the hot water.

[0024] The present invention discloses a single vertical well water-driven natural alkali ore mining method, wherein the lowering depth of the packer is (H+1 / 2h). The lowering position of the packer determined in this way can effectively isolate the upper and lower parts of the alkali ore layer, prevent the materials in the upper and lower parts from crossing each other, and is also beneficial to the mining and utilization effect of the alkali ore; before the packer is lowered, an appropriate amount of butter is applied to the outer surface of the rubber sleeve of the packer, which is for reducing friction and making the packer smoother in the process of being lowered into the well. Applying butter can reduce the friction between the rubber sleeve and the well wall, reduce friction resistance, and thus make the packer be lowered more smoothly; after the packer reaches the target lowering position, it is sealed according to the packer operating procedures, and the purpose of sealing is to ensure that the packer can effectively isolate different layers in the wellbore to achieve the expected sealing effect; by correctly selecting and lowering the pumping equipment, the liquid in the well can be effectively extracted to meet the production needs of the single well; by injecting hot water into the annulus of the central pipe and the casing, the continuous mining of underground resources is realized. This method is flexible and the injection and production parameters can be adjusted as needed to achieve the regulation of the production process.

[0025] During the mining process, the center pipe and the casing annulus must first be connected and sealed to prevent hot water leakage. Hot water is then injected into the center pipe and the casing annulus, and the hot water enters the ore layer through the casing perforation section, and the natural soda ore is extracted along with the hot water. A lifting device is lowered in the center pipe to achieve a continuous mining process. The lower lifting device can extract underground resources from the casing annulus to the ground and carry out corresponding processing. The continuous mining method provided by the present invention can improve production efficiency, reduce downtime, and thus achieve more stable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention discloses a flow chart of a single vertical well water-driven natural alkali ore mining method.

[0027] Figure 2 The present invention is a schematic diagram of a method for mining natural alkali ore by water flooding using a single vertical well.

[0028] Among them, 1. Alkali ore layer; 2. Casing; 3. Central pipe; 4. Packer; The arrows in the figure indicate the injection and production flow directions. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In order to better understand the purpose, structure and function of the present invention, the single vertical well water flooding natural alkali ore mining method of the present invention is further described in detail below with reference to the accompanying drawings.

[0033] Example 1:

[0034] like Figure 1 As shown, the present invention provides a single vertical well water flooding natural alkali ore mining method, comprising the following steps:

[0035] Step S1: Determine the lowering position of the packer 4;

[0036] Step S2: Connect the central pipe 3 and the packer 4 and lower them into the well;

[0037] Step S3: the central tube 3 is lowered into the pumping equipment;

[0038] Step S4: hot water is injected into the annulus between the central pipe 3 and the casing 2, and a lifting device is lowered into the central pipe 3 to carry out mining, thereby achieving continuous mining. At the same time, injection and production parameters are adjusted to control production.

[0039] Example 2:

[0040] like Figure 1 As shown, the present invention provides a single vertical well water flooding natural alkali ore mining method, comprising the following steps:

[0041] Step S1: Determine the lowering position of the packer 4;

[0042] Step S2: Connect the central pipe 3 and the packer 4 and lower them into the well;

[0043] Step S3: the central tube 3 is lowered into the pumping equipment;

[0044] Step S4: hot water is injected into the annulus between the central pipe 3 and the casing 2, and a lifting device is lowered into the central pipe 3 to carry out mining, thereby achieving continuous mining. At the same time, injection and production parameters are adjusted to control production.

[0045] This embodiment differs from the first embodiment in that:

[0046] In step S1, the steps for determining the lowering position of the packer 4 are as follows:

[0047] Step M1: select wells with an alkali ore layer 1 thickness greater than 3 m for analysis;

[0048] Step M2: confirming the depth H and thickness h of the upper part of the alkali ore layer 1;

[0049] Step M3: The calculation formula for lowering the packer 4 into position is as follows:

[0050] L=(H+1 / 2h)

[0051] Wherein, L is the depth of the packer 4 in the lowering position.

[0052] The upper depth of the alkali ore layer H refers to the vertical distance from the ground surface to the upper part of the alkali ore layer, and the thickness of the alkali ore layer h refers to the vertical thickness of the alkali ore layer.

[0053] After determining the upper depth H and thickness h, the placement of the packer 4 can be determined. The packer 4 is placed at a depth of (H + 1 / 2h). This placement effectively isolates the upper and lower portions of the alkali ore layer, preventing cross-contamination between the upper and lower portions. This also facilitates the mining and utilization of the alkali ore.

[0054] In step S2, the steps of lowering the packer 4 are as follows:

[0055] Step K1: Connect the central pipe 3 and the packer 4, ensuring that they are lowered into the well at the same time;

[0056] Step K2: Apply butter to the outer surface of the rubber tube of the packer 4 to reduce the friction between the rubber tube and the well wall, thereby making the lowering of the packer 4 smoother;

[0057] Step K3: Slowly and evenly lower the packer 4 to the position determined in step S1;

[0058] Step K4: Set the packer 4 according to the operating procedures to ensure that the packer 4 is fixed in the wellbore.

[0059] Before lowering the packer 4, apply a proper amount of butter on the outer surface of the rubber tube of the packer 4 to reduce friction and make the packer 4 run more smoothly in the well. Applying butter can reduce the friction between the rubber tube and the well wall, reduce frictional resistance, and thus make the packer 4 run more smoothly.

[0060] After the packer 4 reaches its target position, it is set according to the packer's operating procedures. This involves using appropriate tools to secure the packer 4 in the wellbore to prevent it from moving up and down. The purpose of setting the packer 4 is to ensure that the packer 4 can effectively isolate the different strata in the wellbore to achieve the desired isolation effect.

[0061] By executing the above steps, the process of lowering the packer 4 can be ensured to be safe and reliable, and the expected isolation effect can be achieved. The use of the packer 4 is very important for downhole operations, which can effectively prevent cross contamination between different layers and ensure the smooth progress of downhole operations.

[0062] Example 3:

[0063] like Figure 1 and Figure 2 As shown, the present invention provides a single vertical well water flooding natural alkali ore mining method, comprising the following steps:

[0064] Step S1: Determine the lowering position of the packer 4;

[0065] Step S2: Connect the central pipe 3 and the packer 4 and lower them into the well;

[0066] Step S3: the central tube 3 is lowered into the pumping equipment;

[0067] Step S4: hot water is injected into the annulus between the central pipe 3 and the casing 2, and a lifting device is lowered into the central pipe 3 to carry out mining, thereby achieving continuous mining. At the same time, injection and production parameters are adjusted to control production.

[0068] This embodiment differs from the first embodiment in that:

[0069] In step S3, corresponding pumping equipment is selected and lowered according to the production capacity of the single well, the properties of the liquid, the depth and diameter of the well.

[0070] Mechanical pumping equipment is a device used to extract groundwater or other liquids from underground wells and lift the liquid in the well to the ground.

[0071] When selecting pumping equipment, consider the production capacity of a single well. Production capacity refers to the amount of fluid produced in a well, typically expressed as flow rate, such as per minute or per hour. Based on the production capacity of a single well, select the appropriate pumping equipment to meet your extraction needs.

[0072] When selecting mechanical pumping equipment, in addition to considering production capacity, other factors need to be considered, such as well depth, wellbore diameter, and liquid properties. These factors will affect the selection and design of mechanical pumping equipment.

[0073] Once the appropriate pumping equipment has been identified, it can be lowered into the well. Before lowering the equipment, ensure that its installation and connections comply with relevant operating procedures and standards. During the lowering process, pay attention to the speed of the equipment, ensuring a smooth and slow lowering process to avoid damage or accidents.

[0074] By correctly selecting and running pumping equipment, the liquid in the well can be effectively extracted to meet the production needs of a single well.

[0075] In step S4, continuous mining of underground resources is achieved by injecting hot water into the annulus between the central pipe 3 and the casing 2. This method is flexible and can adjust the injection and mining parameters as needed, thereby achieving regulation of the production process.

[0076] During the mining process, the center pipe 3 and the annulus of the casing 2 must first be connected and sealed to prevent hot water leakage. Hot water is then injected into the annulus between the center pipe 3 and the casing 2. The hot water enters the ore layer through the perforated sections of the casing 2, and the natural soda ore is extracted along with the hot water. A lifting device is installed inside the center pipe 3 to achieve a continuous mining process. This lowering device extracts underground resources from the annulus of the casing 2 to the surface for appropriate processing. This continuous mining method improves production efficiency, reduces downtime, and achieves more stable production.

[0077] Furthermore, by adjusting injection and production parameters, we can control the extraction process. These parameters include the injection rate, temperature, and pressure of hot water. By adjusting these parameters, we can control the extraction rate and quality of underground resources to meet production needs.

[0078] The benefit of production control is the flexibility to adjust according to actual conditions. For example, when production needs to be accelerated, the hot water injection rate and temperature can be increased; when production needs to be slowed or temporarily suspended, the hot water injection volume can be reduced. By adjusting injection and production parameters, we can adjust production according to actual needs, improving production efficiency and quality.

[0079] In summary, the method of injecting hot water into the annulus between the central pipe 3 and the casing 2 and using a bottom-lift device for continuous extraction allows for flexible adjustment of injection and extraction parameters, thereby enabling control of the production process. This extraction method is efficient and stable, meeting the needs of continuous extraction of underground resources. Flexible adjustments based on actual conditions can improve production efficiency and quality.

[0080] Example 4:

[0081] like Figure 1 and Figure 2As shown in the figure, a single vertical well water flooding natural alkali ore mining method of the present invention is used to mine the natural alkali ore development vertical well B. The basic parameters of well B are: well logging interpretation shows that the 1802m-1857m is the natural alkali ore layer, the artificial well bottom depth is 1880m, the perforation layer section is 1803m-1856m, and the Surface casing+ Technical casing+ Alkali zone casing completion, The central pipe 3 is connected to the packer 4. Sucker Rod+ Weighted Rod+ pump.

[0082] Step N1: Determine the position for lowering the packer 4. The alkali ore layer is between 1802m and 1857m, and the packer 4 is lowered into the middle of the alkali ore layer, that is, at 1829.5m.

[0083] Step N2: Connect the central pipe 3 to the packer 4 and lower them simultaneously. Before lowering the packer 4 into the well, apply an appropriate amount of butter to the outer surface of the rubber sleeve. Lower the packer 4 slowly and evenly. Once it reaches the target location, set the packer 4 according to the operating procedures.

[0084] Step N3: Lower the lifting equipment into the central pipe 3. pump.

[0085] Step N4: Production and Control: Hot water is injected into the annulus between the central pipe 3 and the casing 2, and the alkali solution is pumped up to the surface by the pump in the central pipe 3.

[0086] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A single vertical well water flooding natural alkali ore mining method, characterized in that: The following steps are involved: Step S1: Determine the running position of the packer; Step S2: Connect the central pipe and the packer and lower them into the well; Step S3: The central tube is lowered into the pumping equipment; Step S4: hot water is injected into the annulus between the central pipe and the casing, and a lifting device is lowered into the central pipe to carry out mining, thereby achieving continuous mining. At the same time, injection and production parameters are adjusted to control production.

2. The single vertical well water flooding natural alkali ore mining method according to claim 1, characterized in that: In step S1, the steps for determining the packer running position are as follows: Step M1: select wells with alkali ore layer thickness greater than 3m for analysis; Step M2: confirm the depth H and thickness h of the upper part of the alkali ore layer; Step M3: The calculation formula for the packer lowering position is as follows: L=(H+1 / 2h) Where L is the depth of the packer lowering position.

3. The single vertical well water flooding natural alkali ore mining method according to claim 2, characterized in that: In step S2, the steps of running the packer are as follows: Step K1: Connect the central pipe and the packer, ensuring that they are lowered into the well at the same time; Step K2: Apply butter to the outer surface of the packer's rubber sleeve to reduce the friction between the rubber sleeve and the wellbore wall, thereby making the packer's lowering smoother; Step K3: lowering the packer to the position determined in step S1 at a uniform speed; Step K4: Set the packer according to the packer operating procedures to ensure that the packer is fixed in the wellbore.

4. The single vertical well water flooding natural alkali mining method according to any one of claims 1 to 3, characterized in that: In step S3, corresponding pumping equipment is selected and lowered according to the production capacity of the single well, the properties of the liquid, the depth and diameter of the well.

5. The single vertical well water flooding natural alkali ore mining method according to any one of claims 1 to 3, characterized in that: In step S4, the injection and production parameters include the injection rate, temperature and pressure of the hot water.

6. The single vertical well water flooding natural alkali mining method according to any one of claims 1 to 3, characterized in that: In step S4, the central pipe and the casing annulus are first connected and sealed to prevent hot water leakage; then, hot water is injected into the central pipe and the casing annulus, and the hot water enters the ore layer through the casing perforation section, and the natural soda ore is extracted along with the hot water.

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