In-situ leaching uranium mining layer high-pressure hydraulic jet well washing process

Abstract

The invention belongs to a jet well washing process, and particularly relates to a high-pressure hydraulic jet well washing process for an in-situ leaching uranium mining layer. The in-situ leaching uranium mining layer high-pressure hydraulic jet well washing process comprises the following steps: step 1, drifting a well; step 2, ground testing; thirdly, a cleaning tool string is assembled and cleaned; and 4, pulling out of the hole. The high-pressure hydraulic jet well washing method has the advantages that 40 liquid pumping holes are cleaned in total in high-pressure hydraulic jet well washing, and in follow-up test effect tracking, the water quantity of 16 drilled wells (40%) is increased to 1.5 m < 3 > / h, and the maintaining time is longer than 150 d; when the liquid injection hole is removed, the effect of the hole washing mode is far better than that of a liquid pumping hole, the water amount is increased by 1.3 m < 3 > / h, and the maintaining time is only 32.5 d.

Description

Technical Field

[0001] The present invention belongs to the process of jet well washing, and particularly relates to a high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layers. Background Technique

[0002] By analyzing the drilling construction process, leaching process, and well washing process of a certain in-situ leaching mine in Xinjiang, it is found that:

[0003] 1. According to the existing gravel-packed drilling construction process, plant gum and bentonite are mainly used as drilling fluids. This drilling method belongs to positive-pressure drilling. Under the action of pressure, the drilling fluid penetrates into the ore layer, polluting and blocking the filters, borehole walls, and near-well zones of the pumping and injection wells, reducing the permeability of the ore layer; the cementing fluid used in the drilling and completion process is mainly cement, which will block the formation after solidifying in the formation, reducing the permeability of the ore layer.

[0004] 2. According to the existing leaching process, it is mainly a neutral leaching process. The formation lithology is mainly gravel and coarse sand. The ore-bearing aquifer has a large porosity and good permeability. During the pumping and injection processes, it is extremely easy to produce sand. The sand migrates through pores or throats and accumulates near the pumping well, causing mechanical blockage of the near-well zone and filters. The content of water-sensitive clay mineral montmorillonite in the formation is low. Non-swelling clay minerals such as kaolinite, chlorite, and illite are dispersed and transported under the scouring of the leaching agent, which may lead to mechanical blockage of the near-well zone of the pumping well. Analyzing the mineral composition of the blockage in the drilling filter, it is mainly quartz, calcite, and a small amount of hexavalent uranium minerals of uranium, indicating that calcite and hexavalent uranium ore are redeposited during the in-situ leaching process. The results of indoor simulated leaching experiments combined with geochemical model calculations show that calcium carbonate and dolomite are one of the main minerals forming chemical precipitation blockage in the deposit; the oxidation of pyrite leads to a continuous increase in the concentration of SO4 2- in the system, making calcium sulfate tend to be saturated, and at the same time causing iron precipitation in the ore layer.

[0005] 3. According to the current well washing process, for the mechanical blockage and chemical blockage occurring during the production process, physical or chemical or combined well washing is adopted.

[0006] For the conventional air compressor well washing, the well washing effect is poor and the maintenance time is short. There are two main reasons. One is that the drilling depth is relatively large. Due to the small air volume of the air compressor, it is impossible to create a large negative pressure to cause groundwater to rush into the well, so that the blockage near the filter and in the near-well zone cannot rush into the well in large quantities and finally be discharged to the surface. The other is that there is chemical blockage in some drillings, and the conventional hole washing cannot dissolve the blockage.

[0007] Combined with dilute hydrochloric acid for well flushing, this method can effectively dissolve chemical blockages such as calcium carbonate and magnesium carbonate. The well flushing effect is obvious in the initial stage of well flushing, but as the well flushing progresses, the effect of this well flushing method decreases. Through analysis, firstly, the dilute acid reacts with the blockages in the formation pore throats and dissolves them. The formation pore throats are dredged, and due to the negative pressure caused by conventional air compressor well flushing, the dissolved substances are carried out. However, due to the water body replacement of a part of the dissolved substances, the pH value changes and new blockages are generated. In the initial stage of the generation of the newly formed blockages, the particles are small and can move with the water body. But after a long time, its saturation increases, and the small particle blockages form large particle blockages, re-blocking the originally dredged formation pore throats. Secondly, the chemical blockages in the near-well zone are dissolved by adding acid for a long time and carried out by air compressor well flushing. Since the air volume of the air compressor is small and cannot carry all the dissolved substances to the surface, over time, the blockages that have not been carried to the surface still exist near the filter and the wellbore, forming new blockages. Summary of the Invention

[0008] In view of the defects of the prior art, the present invention provides a high-pressure hydraulic jet well flushing process for in-situ leaching uranium ore layers.

[0009] The present invention is realized as follows: A high-pressure hydraulic jet well flushing process for in-situ leaching uranium ore layers, which includes the following steps:

[0010] Step 1: Well unblocking;

[0011] Step 2: Ground test;

[0012] Step 3: Assemble the cleaning tool string and conduct cleaning;

[0013] Step 4: Pull out the drill string.

[0014] For a high-pressure hydraulic jet well flushing process for in-situ leaching uranium ore layers as described above, wherein, the step 1 includes,

[0015] Use a well unblocking gauge to conduct well unblocking, check the casing deformation situation. The well unblocking drill string combination: well unblocking gauge + variable coupling + hydrographic drill pipe. Measure the length of the downhole tools and drill pipes, make records, describe the downhole tools and draw a sketch for recording, and lower the drill string to 1 m below the target section.

[0016] For a high-pressure hydraulic jet well flushing process for in-situ leaching uranium ore layers as described above, wherein, the step 1 includes,

[0017] The specification of the well unblocking gauge is Φ79mm×1.0m, and the specification of the well unblocking drill string combination is Φ79mm×1.0m well unblocking gauge + variable coupling + hydrographic drill pipe.

[0018] For a high-pressure hydraulic jet well flushing process for in-situ leaching uranium ore layers as described above, wherein, the step 1 includes,

[0019] After the well gauging tool enters the variable diameter position, control the lowering speed to < 2 m / s. Observe the weight indicator carefully. When encountering resistance, the applied pressure should not exceed 1.5 T. After passing through, repeatedly raise and lower the tool no less than 3 times; in the section to be cleaned, after passing up and down no less than 3 times, the drill can be pulled out. Take out the well gauging tool and check the changes at the bottom and side of the well gauging tool, and record and describe them.

[0020] A high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layers as described above, wherein step two includes,

[0021] Connect the cleaning tool according to the drill string assembly. Conduct tests based on the technical parameters of the cleaning tool. Start the pump truck. Gradually and slowly increase the pump pressure from 0 → 15 MPa. Control the displacement within 0 - 600 Lpm. Record the pump pressure and displacement during this period.

[0022] A high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layers as described above, wherein step three includes,

[0023] ⑴ Cleaning drill string structure:

[0024] Measure the length of the downhole tool and drill string, make records, describe the downhole tool and draw a sketch for recording. Assemble and lower the drill string to the milling section. The above-mentioned variable connection refers to the variable connection joint, and the short joint refers to the short connecting pipe;

[0025] ⑵ Construction parameter selection:

[0026] ① Displacement

[0027] Normal displacement: 320 L / min;

[0028] ② Pump pressure

[0029] The pump truck pressure is 8 MPa - 15 MPa. The single-hole well washing time is greater than 3 h. The wellhead returns clear water without impurities to be qualified;

[0030] ⑶ Operation requirements:

[0031] ① Before the cleaning tool is lowered into the well, carefully check whether all threads are tightened;

[0032] ② Make the connection according to the make-up torque required by the standard;

[0033] ③ Drilling requirements: The driller operates smoothly and strictly controls the lowering speed. Especially after entering the small wellbore, careful operation should be carried out;

[0034] ④ Start the pump when reaching 1 m above the top boundary of the section to be cleaned. Observe the change of the pump truck pressure. After the pump pressure is stable, quickly lower the drill string. Control the speed at 3 - 5 m / s to pass through the cleaning section. During this period, continuously lower and raise the drill string until 1 m below the bottom boundary of the cleaning section;

[0035] ⑤ During the cleaning process, pay attention to observing the water return situation at the wellhead, collect water samples, and compare them with the water samples before the operation.

[0036] ⑥ Observe the pressure changes of the pump truck at any time. If any abnormality is found, stop the cleaning immediately for inspection. After eliminating the problems, resume the construction operation.

[0037] ⑦ Keep records and describe them. There should be a sketch description for the tools going into the well.

[0038] As described above, a high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layers, wherein the step four includes,

[0039] ⑴ After completing the cleaning operation, stop the pump, disassemble the water hose, and slowly lift the drill string. The lifting load exceeding the hanging weight overload should not exceed 0.5T.

[0040] ⑵ When getting stuck at a certain point, start the pump and slowly lift to release the stuck. After the load returns to normal, stop the pump and lift, increasing the lifting speed.

[0041] ⑶ During the drill pipe pulling process, the technicians should pay attention to observing the liquid returning from the wellhead.

[0042] ⑷ After taking out the tools, comprehensively inspect the pipe string and cleaning tools, describe and record them, and clean and maintain the tools.

[0043] As described above, a high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layers, wherein when performing the above steps, the following matters should also be noted,

[0044] ⑴ During the well flushing and cleaning process, strictly execute the technical instructions, feed the drill evenly, and prevent sudden stops and slips.

[0045] ⑵ The driller observes and records the drill string parameters, especially intensively records the changes in the hanging weight, torque, and pump pressure. If any abnormality occurs, stop the cleaning immediately and analyze the downhole situation clearly.

[0046] ⑶ Operate smoothly, do not lift or lower suddenly. During the grinding and milling operations, do not suddenly brake the rotary table to avoid inertial back-off of the drill string.

[0047] ⑷ During the cleaning operation, except for the driller and technicians, other personnel should evacuate to prevent accidents. Personnel are prohibited from staying in the high-pressure area. Warning lights should be installed in the operation area and non-staff are strictly prohibited from entering the operation area.

[0048] ⑸ Install the wellhead self-sealing when pulling out and lowering the drill string. Do a good job in preventing the wellhead from falling during the whole construction process. Pay attention to observing the changes of the weight indicator at any time and record the friction resistance during the drill pipe pulling process.

[0049] ⑹ When getting stuck during the drill pipe pulling, the force should not exceed 2 tons to prevent hard sticking. The drill strings should be arranged neatly and numbered in sequence.

[0050] (7) The downhole tools shall be inspected, measured for size, and a sketch shall be drawn as per the regulations; the uphole tools shall be photographed, inspected, analyzed, and records shall be made.

[0051] (8) The downhole drill pipes must be full-bored, and the screw threads must be tightened to the specified torque.

[0052] (9) During the cleaning process, the production shift shall frequently check the operation of the equipment, detect problems as early as possible and handle them in a timely manner to ensure the continuity of the cleaning construction; reserve common components for timely replacement.

[0053] The remarkable effect of the present invention is that a total of 40 liquid extraction holes were cleaned by high-pressure hydraulic jet well washing. During the subsequent follow-up of the test effect, the water volume of 16 wells (40%) increased by 1.5 m 3 / h and the maintenance time was more than 150 days; when relieving the injection holes, the effect of this hole washing method was far less than that of the liquid extraction holes, and the water volume increased by 1.3 m 3 / h, and the maintenance time was only 32.5 days. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Schematic diagram of high-pressure hydraulic jet well washing process

[0055] In the figure: 1. Pump truck, 2. Drilling (workover) truck, 3. Drill pipe, 4. Turbine rotary nozzle DETAILED DESCRIPTION OF THE INVENTION

[0056] A high-pressure hydraulic jet well washing process for in-situ leaching uranium ore seams includes the following steps

[0057] 1. Well flushing:

[0058] Use a Φ79mm×1.0m full-bore gauge to flush the well and verify the casing deformation. Well-flushing drill string assembly: Lower a Φ79mm×1.0m full-bore gauge + reducer + hydrodrill pipe, measure the length of the downhole tools and drill pipes, make records, describe the downhole tools and draw a sketch for record, and lower the drill string to 1 m below the target section. Note: After the full-bore gauge enters the variable diameter position, control the lowering speed, <2 m / s, observe the weight indicator display, do not apply more than 1.5 T of pressure when encountering resistance, and repeatedly lift and lower by no less than 3 times after passing through; especially in the well cleaning section, lift and lower by no less than 3 times before pulling out the drill string. After pulling out the full-bore gauge, check the changes in the bottom and side of the full-bore gauge and record the description.

[0059] 2. Ground test

[0060] Connect the cleaning tool according to the drill string assembly, conduct tests based on the technical parameters of the cleaning tool, start the pump truck, gradually and slowly increase the pump pressure from 0 to 15 MPa, control the displacement within 0 - 600 Lpm. During this period, observe the rotational speed change of the cleaning tool and the water jet state, the changes in pump pressure and displacement, and the rotational speed and jet changes of the cleaning tool, and adjust the pump pressure and displacement according to the rotational speed and jet conditions, and record them. If there is any abnormality, immediately stop the pump for inspection and troubleshoot.

[0061] 3. Assemble the cleaning tool string and conduct cleaning

[0062] ⑴ Cleaning drill string structure:

[0063] Measure the length of the downhole tools and drill string, make records, describe the downhole tools and draw a sketch for recording, and lower the drill string to the milling section.

[0064] ⑵ Construction parameter selection:

[0065] ① Displacement

[0066] Normal displacement: 320 L / min

[0067] ② Pump pressure

[0068] The maximum pump pressure is controlled within 15 MPa (select a suitable pump pressure value as the construction pressure according to the pump pressure tested on the ground). According to on-site tests, the pump truck pressure is 8 MPa - 12 MPa, the single-hole well washing time should be more than 3 h, and the wellhead should return clear water without impurities to be qualified.

[0069] ⑶ Operation requirements:

[0070] ① Before the cleaning tool is lowered into the well, carefully check whether all threads are tightened;

[0071] ② Make the connection according to the make-up torque required by the standard;

[0072] ③ Requirements for lowering the drill string: The driller operates smoothly and strictly controls the lowering speed. Especially after entering the small wellbore, careful operation should be carried out;

[0073] ④ Start the pump when reaching 1 m above the top boundary of the cleaning well section, observe the change of the pump truck pressure. After the pump pressure is stable, quickly lower the drill string, and control the speed at 3 - 5 m / s to pass through the cleaning section. During this period, continuously lower and lift the drill string until 1 m below the bottom boundary of the cleaning section;

[0074] ⑤ During cleaning, pay attention to observing the water return situation at the wellhead, pay attention to taking water samples and comparing them with the water samples before the operation;

[0075] ⑥ Observe the change of the pump truck pressure at any time. If any abnormality is found, immediately stop the cleaning for inspection. After eliminating the abnormality, resume the construction operation;

[0076] ⑦Keep records and describe them. Downhole tools should have sketch descriptions.

[0077] 4. Pulling out the drill

[0078] ⑴After completing the cleaning operation, stop the pump, disassemble the hose, and slowly lift the drill string. The driller should pay attention to the change of the hook load. The lifting load exceeding the hook load overload should not exceed 0.5T.

[0079] ⑵When stuck at a certain point, start the pump and slowly lift and lower to release the stuck. After the load is normal, stop the pump and lift, and increase the lifting speed.

[0080] ⑶During the process of pulling out the drill, the technicians should pay attention to observing the liquid returning from the wellhead.

[0081] ⑷After pulling out the tools, comprehensively inspect the pipe string and cleaning tools, and make descriptive records. Clean and maintain the tools.

[0082] 5. Safety and precautions

[0083] ⑴During the wellbore cleaning process, strictly execute the technical instructions, feed the drill evenly, and prevent sudden stops and slips.

[0084] ⑵The driller observes and records the drill string parameters, especially the hook load, torque, and pump pressure changes at increased intervals. In case of abnormalities, immediately stop the cleaning and analyze the downhole conditions clearly.

[0085] ⑶Operate smoothly, do not lift or lower suddenly. During milling and reaming, it is prohibited to suddenly brake the rotary table to avoid reverse buckling of the drill string due to inertia.

[0086] ⑷During the cleaning operation, except for the driller and technicians, other personnel should evacuate to prevent accidents. Personnel are prohibited from staying in the high-pressure area. Warning lights should be installed in the operation area and non-staff are strictly prohibited from entering the operation area.

[0087] ⑸Install the wellhead self-sealing during tripping in and out. Do a good job in preventing the wellhead from falling during the whole construction process. Always pay attention to the change of the weight indicator and record the friction during pulling out the drill.

[0088] ⑹When stuck during pulling out the drill, the force should not exceed 2 tons to prevent hard sticking. The drill strings should be arranged neatly and numbered in sequence.

[0089] ⑺Downhole tools should be inspected, measured, and sketched according to regulations; out-of-well tools should be photographed, inspected, analyzed, and recorded.

[0090] ⑻Downhole drill strings must be full-bored and the threads must be tightened to the specified torque.

[0091] ⑼During the cleaning process, the production shift should frequently check the operation of the equipment, detect problems as early as possible and handle them in a timely manner to ensure the continuity of the cleaning construction. Keep a reserve of common parts for timely replacement.

[0092] The schematic structural diagram of the device used in the present invention is shown in the appendix Figure 1 As shown, a well opener is lowered into the well using a drilling (workover) rig to check the wellbore and determine the casing deformation. Connect the cleaning tool according to the drill string assembly, test it according to the technical parameters of the cleaning tool, start the pump truck, and the pressure of the pump truck is 8 MPa - 12 MPa. The high-pressure water acts on the turbine through a specific water eye of the turbine rotary cleaning tool, driving the turbine to rotate at high speed, stirring the wellbore water to form a water vortex, enabling the vortex to pass through the screen pipe, flowing out through the screen pipe and acting on the packed gravel through the frame filter. At the same time, cooperate with the piston to move up and down to form positive and negative pressures, disturbing the gravel filter outside the pipe to turn over, and cleaning the blockages adsorbed on the surface of the gravel. The single-hole well washing time should be more than 3 hours, and the wellhead returns clear water without impurities to be qualified.

[0093] The following gives a specific example.

[0094] In a uranium deposit in Xinjiang, a high-pressure hydraulic jet well washing process was carried out. A total of 40 pumping holes were cleaned by high-pressure hydraulic jet well washing. Although the well washing cost is high, in the subsequent follow-up of the test results, the water volume of 16 wells (40%) increased by 1.5 m 3 / h and the maintenance time was more than 150 days; when relieving the injection holes, the effect of this well washing method was far less than that of the pumping holes, and the water volume increased by 1.3 m 3 / h, and the maintenance time was only 32.5 days. Such a large difference occurred. After discussion, it was considered that the injection holes were mainly chemically blocked. High-pressure hydraulic jet well washing can have a certain effect on the chemically blocked substances with weak compaction, but has poor ability to remove the chemically blocked substances with severe compaction. When removing mechanical blockages in pumping holes, high-pressure hydraulic jet well washing is preferably selected. At the same time, this process does not use chemical reagents, is clean and environmentally friendly, does not produce well washing waste liquid, and will not cause secondary blockage to the formation.

Claims

1. A high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits, characterized in that, It includes the following steps: Step 1: Reaming the well; Step 2: Ground test; Step 3: Assemble the cleaning tool string and conduct cleaning; Step 4: Pulling out the drill string.

2. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 1, characterized in that: The said Step 1 includes, Reaming the well with a reamer to find out the casing deformation situation. The reaming drill string assembly: reamer + reducer + hydrodrill pipe. Measure the length of the downhole tools and drill string, make good records, describe the downhole tools and draw a sketch for recording, and lower the drill string to 1 m below the target section.

3. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 2, characterized in that: The said Step 1 includes, The specification of the reamer is Φ79mm×1.0m, and the specification of the reaming drill string assembly is Φ79mm×1.0m reamer + reducer + hydrodrill pipe.

4. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 3, characterized in that: The said Step 1 includes, After the reamer enters the variable diameter position, control the lowering speed, <2m / s. Pay attention to observing the indication of the weight indicator. When encountering resistance, apply a pressure not exceeding 1.5T. After passing through, repeatedly lift and lower ≮3 times; in the cleaning section, lift and lower ≮3 times up and down before pulling out the drill string. Pull out the reamer and check the changes in the bottom and side of the reamer, and record and describe them.

5. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 4, characterized in that: The said Step 2 includes, Connect the cleaning tools according to the drill string assembly, conduct tests according to the technical parameters of the cleaning tools, start the pump truck, and gradually and slowly increase the pump pressure from 0→15MPa. Control the displacement within 0 - 600Lpm, and record the pump pressure and displacement during this period.

6. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 5, characterized in that: The said Step 3 includes, ⑴ Cleaning drill string structure: Washing tool + coupling + 1 - 1.5m short joint + piston + coupling + Drill pipe; measure the length of the tools and drill pipes going into the well, make records, describe the tools going into the well and draw a sketch for recording. Assemble the drill pipes to the milling section. The above-mentioned couplings refer to coupling joints, and the short joints refer to short connecting pipes; ⑵ Selection of construction parameters: ① Displacement Normal displacement: 320L / min; ② Pump pressure The pump truck pressure is 8MPa - 15MPa, and the single-hole well washing time is greater than 3h. It is qualified only when the clear water returned from the wellhead is free of impurities; ⑶ Operation requirements: ① All threads of the cleaning tools should be carefully checked before lowering into the well; ② Make up the threads according to the make-up torque required by the standard; ③ Requirements for lowering the drill string: The driller operates smoothly and strictly controls the lowering speed. Especially after entering the small wellbore, operate carefully; ④ Start the pump when lowering to 1 m above the top boundary of the cleaning section, observe the change of the pump truck pressure. After the pump pressure is stable, quickly lower the drill string, and control the speed at 3 - 5m / s to pass through the cleaning section. During this period, continuously lower and lift the drill string until 1 m below the bottom boundary of the cleaning section; ⑤ Pay attention to observing the water return situation at the wellhead during cleaning, pay attention to taking water samples and compare them with the water samples before the operation; ⑥ Observe the change of the pump truck pressure at any time. If any abnormality is found, stop cleaning and check in time. After eliminating the abnormality, resume the construction operation; ⑦ Make good records and describe them. The downhole tools should have a sketch description.

7. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore deposits according to claim 6, characterized in that:The said Step 4 includes, ⑴ After completing the cleaning operation, stop the pump, disassemble the hose, and slowly lift the drill string. The lifting load exceeding the hanging weight overload should not exceed 0.5T; ⑵ When getting stuck at one point, start the pump and slowly lift and lower to release the stuck. After the load is normal, stop the pump and lift, and increase the lifting speed; ⑶ During the process of pulling out the drill string, the technical personnel should pay attention to observing the liquid returned from the wellhead; ⑷ After pulling out the tools, comprehensively check the pipe string and cleaning tools, and conduct description and record, and clean and maintain the tools.

8. The high-pressure hydraulic jet well washing process for in-situ leaching uranium ore layer according to claim 7, characterized in that: When performing the above steps, the following matters should also be noted, ⑴ During reaming and cleaning, strictly execute the technical instructions, feed the drill evenly, and prevent jamming and slipping; ⑵ The driller observes and records the drill string parameters, especially intensively records the changes in the hanging weight, torque and pump pressure. If any abnormality is found, stop cleaning in time and analyze the downhole situation clearly; ⑶The operation shall be stable, and there shall be no sudden lifting or lowering. During the grinding and milling operations, sudden braking of the rotary table is prohibited to avoid inertial reverse threading of the drill string; ⑷During the cleaning operation, all personnel other than the driller and technical personnel shall evacuate to prevent accidents; Personnel are prohibited from staying in the high-pressure area. Warning lights shall be installed in the operation area, and non-staff are strictly prohibited from entering the operation area; ⑸When tripping in or out, install a wellhead self-sealing device, and do a good job in preventing the wellhead from falling during the entire construction process; Always pay attention to the changes in the weight indicator and record the friction resistance during tripping out; ⑹When tripping out, if stuck, the force shall not exceed 2 tons to prevent hard sticking; The drill string shall be arranged neatly and numbered in sequence; ⑺The tools to be lowered into the well shall be inspected, measured, and sketched according to regulations; The tools taken out of the well shall be photographed, inspected, analyzed, and recorded; ⑸The drill string to be lowered into the well must be full-bored, and the threads must be tightened to the specified torque; ⑹During the cleaning process, the production shift shall frequently check the operation of the equipment, detect problems as early as possible and handle them in a timely manner to ensure the continuity of the cleaning construction; Prepare sufficient stocks of commonly used parts for timely replacement.

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