Underground jarring force acquisition system and acquisition method

Abstract

The invention provides an underground jarring collecting system and method. The underground jarring collecting system comprises a jarring assembly and a collecting assembly. The jarring assembly comprises a connecting shaft with a cavity, a first compression piece and a second compression piece which are arranged in the cavity in a spaced mode, and a sliding shaft arranged between the first compression piece and the second compression piece. When fluid media are injected into the cavity, the first compression part is compressed, the guide shaft is driven to push the sliding shaft to slide, and the second compression part is compressed. The collecting assembly comprises a sensing assembly arranged in the second compression part and the cavity and a flow testing unit. The sensing assembly is used for monitoring the compression amount of the second compression part, and the flow testing unit is used for monitoring the flow of the fluid medium flowing out of the cavity. The jarring collecting system further comprises a controller, the controller is in electric signal connection with the sensing assembly and the flow testing unit, and the connecting shaft is connected with the heavy weight drill pipe. According to the device, the jarring force is monitored in real time during jarring, adjustment is made in time, and the jarring effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole jar equipment, and in particular to a downhole jar collection system. The present invention also relates to a collection method of the downhole jar force collection system. Background Art

[0002] The role of downhole jarring force collection is to improve collection efficiency. Jarring force can effectively break rocks and improve drilling efficiency. Especially when dealing with hard or complex rock formations, jarring force can significantly improve the penetration ability of the drill bit. And through jarring force, the shape and size of the wellbore can be better controlled, reducing the instability and collapse risk of the well wall, thereby improving the stability and integrity of the wellbore. In addition, during the drilling process, jarring force can help to remove the stuck drill, especially when encountering sand layers or soft and hard alternating formations, the jar can help the drill bit get out of trouble through impact force.

[0003] Therefore, accurate collection of underground jarring force is crucial to optimizing the performance of the jar and ensuring the safety of underground operations. The existing methods for collecting underground jarring force include mechanical jars, hydraulic jars, chemical jars, etc. Mechanical jars use a series of springs, pins, and release mechanisms to achieve jarring. The mechanical jar jar jars upward when the tension reaches a pre-selected value, and jars downward when the compression reaches a pre-selected value. Its jarring force is adjusted by setting a release mechanism on the ground or underground.

[0004] There are many factors that affect the accuracy of the jarring force, such as the depth of the well, the viscosity of the drilling fluid and lubricating oil, the number and quality of the drill pipes, and the valve core diameter. The jarring force of the existing jar can be freely adjusted by the size of the lifting force. When adjusting, the value calculated by the formula is adjusted. The jarring force calculated according to the formula often does not take into account the loss, and the value is often much higher than the actual jarring force, thus affecting the unblocking effect of the downhole jar. In particular, when the logging instrument encounters different stuck forces, the actual jarring unblocking tonnage that the downhole jar can achieve, and the actual displacement that the jarring can produce cannot be measured, and it is impossible to quantitatively evaluate the unblocking effect of the downhole jar, and it cannot provide an accurate basis for field applications. Summary of the invention

[0005] In view of this, the present invention aims to propose a downhole shock force collection system, so as to be able to monitor the shock force in real time during shock and make timely adjustments to ensure the shock effect of the shock jar.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A downhole jarring collection system comprises a jarring assembly and a collection assembly arranged in the jarring device;

[0008] The shock assembly comprises a connecting shaft having a cavity, a first compression member and a second compression member arranged in the cavity at intervals, and a sliding shaft arranged between the first compression member and the second compression member;

[0009] A guide shaft is also provided in the cavity. When a fluid medium is injected into the cavity, the first compression member is compressed, the guide shaft is driven to push the sliding shaft to slide, and the second compression member is compressed;

[0010] The collection assembly includes a sensing assembly disposed in the second compression member and the cavity, and a flow testing unit connected to an output end of the cavity;

[0011] The sensing component is used to monitor the compression amount of the second compression member, and the flow testing unit is used to monitor the flow rate of the fluid medium flowing out of the cavity;

[0012] The shock collection system further includes a controller, which is electrically connected to the sensing component and the flow test unit;

[0013] The connecting shaft is connected to the weighted drill rod.

[0014] Further, the cavity includes a first hydraulic cavity and a second hydraulic cavity, and a connecting cavity provided between the first hydraulic cavity and the second hydraulic cavity;

[0015] The guide shaft and the first compression member are arranged in the first hydraulic cavity, and the sliding shaft and the second compression member are arranged in the connecting cavity;

[0016] The weighted drill rod is provided with a connecting cavity in the axial direction, and a plurality of flow cavities evenly distributed around the circumference are provided in the radial direction of the weighted drill rod;

[0017] The flow testing unit is communicated with the flow chamber.

[0018] Furthermore, the front end of the first hydraulic chamber is connected to a pilot chamber, and the circulating medium flows from the pilot chamber into the first hydraulic chamber;

[0019] The guide shaft comprises a column base arranged in steps and a first connecting shaft, and the first compression member is sleeved on the first connecting shaft.

[0020] Further, the sliding shaft includes a trigger section, a connecting section, and a second connecting shaft;

[0021] The front end of the trigger section is provided with a groove, and the first connecting shaft is provided with a flange protruding toward the groove;

[0022] The second compression member is sleeved on the second connecting shaft, and the second compression member and the second connecting shaft are arranged in the second hydraulic chamber;

[0023] When the first compression member is driven to be compressed, the flange abuts against the groove, so that the sliding shaft slides axially along the cavity, and the second compression member is compressed.

[0024] Further, the first hydraulic chamber includes a first sliding section, a second sliding section and a third sliding section;

[0025] The diameter of the second sliding section is larger than that of the first sliding section;

[0026] The two first compression members are arranged along the axial direction of the second sliding section and the third sliding section;

[0027] A first spacer sleeve is provided between the two first compression members, and the outer diameter of the first spacer sleeve is matched with the diameter of the third sliding section.

[0028] Furthermore, two of the second compression members are sleeved on the second connecting shaft, and a second spacer sleeve is provided between the two of the second compression members;

[0029] An overflow chamber is provided at one end of the second hydraulic chamber away from the connecting chamber;

[0030] An overflow channel is provided on the weighted drill rod, the overflow chamber is communicated with the overflow channel, and the flow testing unit is arranged on the overflow channel.

[0031] Further, the induction component includes a magnetic ring arranged on the second compression member, and a waveguide inserted in the second connecting shaft;

[0032] The magnetic ring is close to the initial section on one side of the connecting section. When the second compression member is in a free state, when a pulse current is added into the waveguide, the controller obtains a current signal of the magnetic ring.

[0033] Further, the overflow channel includes a liquid inlet channel connected to the overflow chamber, a plurality of flow channels axially arranged on the weighted drill rod, a metering channel connected to the outlet end of the flow channel, and a liquid outlet channel connected to the outlet end of the metering channel;

[0034] The circulation channel is communicated with the liquid inlet channel.

[0035] Furthermore, a plurality of pipelines are arranged outside the weighted drill rod, and an annular tube is sleeved outside the weighted drill rod, and a flow gap is arranged between the annular tube and the weighted drill rod;

[0036] The metering channel and the liquid outlet channel are formed in the pipeline, and the liquid outlet pipeline is connected with the flow gap;

[0037] The outlet end of the circulation channel is arranged in the pipeline, a rotating column is arranged in the circulation channel, a spiral groove which spirally rises from top to bottom is arranged on the outer side of the rotating column, and the outer diameter of the rotating column is adapted to the inner diameter of the circulation channel;

[0038] When the fluid medium in the liquid inlet channel flows into the circulation channel and flows along the spiral groove, the rotating column is driven to rotate, and an angle sensor for detecting the number of rotations of the rotating shaft is provided in the circulation channel.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] The downhole shock collection system of the present invention is provided with a collection component for monitoring the compression amount of the second compression member, and the lifting force of the jar is calculated according to the compression amount of the second compression member. The lifting force is compared with the calculated lifting force. If the difference is too large, the lifting force of the jar needs to be adjusted. At the same time, a flow test unit is provided to monitor the flow rate of the fluid medium flowing out of the cavity, so as to correct the lifting force obtained by the second compression member again, so as to obtain a more accurate lifting force, so as to monitor the shock force in real time during shocking, and make timely adjustments to ensure the shock effect of the jar.

[0041] Another object of the present invention is to provide a collection method of a downhole shock collection system, wherein the collection method uses the downhole shock collection system as described above to collect shock force, and comprises the following steps:

[0042] Step 1: When the drilling tool is stuck in the well, the fluid medium is poured into the cavity, the first compression member is compressed, the guide shaft pushes the sliding shaft to slide, and the second compression member is compressed;

[0043] Step 2: The sensing component monitors the position information of the second compression member, and transmits the position information to the controller in the form of a current signal. The controller calculates the compression amount t1 of the second compression member according to the current signal, and calculates the lifting force according to the formula F=kΔx;

[0044] The shock force is obtained once every second, and the controller collects the shock force per unit time and forms a curve graph;

[0045] Step 3: The flow testing unit monitors the flow rate of the fluid medium flowing out of the cavity, and calculates the spring compression amount t2 by collecting the flow rate of the fluid medium per unit time. The controller calculates the difference between t1 and t2, and when the difference is greater than a preset threshold, adjusts the shock force;

[0046] Step 4: Repeat steps 1 to 3 until the drilling tool is loosened, the weighted drill rod is engaged with the drilling tool, and the drilling tool is lifted up to the well.

[0047] The collection method of the downhole shock collection system of the present invention monitors the position information of the second compression component through the sensing component, and the controller calculates the lifting force according to the position information, and then monitors the flow rate of the fluid medium flowing out of the cavity, and obtains the spring compression amount t2 through calculation. The controller calculates the difference between t1 and t2, and when the difference is greater than the preset threshold, adjusts the shock force to improve the shock efficiency of the downhole shocker and ensure the shock effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 A schematic diagram of the connection between the downhole shock collection system and the weighted drill pipe according to an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the connection between the flow test unit, the connecting shaft, and the weighted drill rod according to an embodiment of the present invention;

[0051] Figure 3 for Figure 2 A partial enlarged view of point I in the middle.

[0052] Description of reference numerals:

[0053] 1. shock assembly; 2. collection assembly; 3. weighted drill pipe; 4. pipeline; 5. annular pipe; 6. circulation gap; 7. rotating column; 8. wellway;

[0054] 101, connecting shaft; 102, first compression member; 103, second compression member; 104, sliding shaft; 105, guide shaft; 106, first hydraulic chamber; 107, second hydraulic chamber; 108, connecting chamber; 109, pilot chamber; 110, sealing ring; 111, first spacer; 112, second spacer; 113, overflow chamber;

[0055] 201. Sensing component; 202. Flow testing unit;

[0056] 301, connecting cavity; 302, circulation cavity; 303, overflow channel; 304, circulation pipe;

[0057] 701, spiral groove;

[0058] 1041, trigger section; 1042, connecting section; 1043, second connecting shaft; 1044, groove;

[0059] 1051, column base; 1052, first connecting axis; 1053, flange;

[0060] 1061, first sliding section; 1062, second sliding section; 1063, third sliding section;

[0061] 2011, magnetic ring; 2012, waveguide;

[0062] 3031, liquid inlet channel; 3032, circulation channel; 3033, metering channel; 3034, liquid outlet channel. DETAILED DESCRIPTION

[0063] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0064] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0065] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0066] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0067] This embodiment relates to a downhole shock collection system. As a whole, Figure 1 As shown, the downhole shock collection system includes a shock assembly 1 and a collection assembly 2 arranged in the shock device. The shock assembly 1 includes a connecting shaft 101 with a cavity, a first compression member 102 and a second compression member 103 arranged in the cavity at intervals, and a sliding shaft 104 arranged between the first compression member 102 and the second compression member 103. A guide shaft 105 is also arranged in the cavity. When a fluid medium is injected into the cavity, the first compression member 102 is compressed, the guide shaft 105 is driven to push the sliding shaft 104 to slide, and the second compression member 103 is compressed.

[0068] The collection component 2 includes a sensing component 201 disposed in the second compression component 103 and the cavity, and a flow test unit 202 connected to the output end of the cavity. The sensing component 201 is used to monitor the compression amount of the second compression component 103, and the flow test unit 202 is used to monitor the flow rate of the fluid medium flowing out of the cavity. The shock collection system also includes a controller, which is electrically connected to the sensing component 201 and the flow test unit 202, and the connecting shaft 101 is connected to the weighted drill rod 3.

[0069] The downhole jarring collection system of this embodiment is provided with a collection component 2 for monitoring the compression amount of the second compression member 103, and the lifting force of the jar is calculated according to the compression amount of the second compression member 103. The lifting force is compared with the calculated lifting force. If the difference is too large, the lifting force of the jar needs to be adjusted. At the same time, the flow rate of the fluid medium flowing out of the cavity is monitored by providing a flow test unit 202 to correct the lifting force obtained by the second compression member 103 again, so as to obtain a more accurate lifting force, so as to monitor the jarring force in real time during jarring, and make timely adjustments to ensure the jarring effect of the jar.

[0070] Based on the above overall introduction, an exemplary structure of the downhole shock collection system of this embodiment is as follows: Figure 1 As shown, the downhole shock collection system of this embodiment is transmitted into the wellbore 8, which includes a connecting shaft 101 carrying a fluid medium, a guide shaft 105, a first compression component 102, a sliding shaft 104 and a second compression component 103 which are sequentially arranged in a cavity. The fluid medium enters from the inlet end of the cavity and first applies pressure to the guide shaft 105. The fluid medium of this embodiment uses hydraulic oil.

[0071] As a preferred implementation mode, Figure 1 As shown, the cavity includes a first hydraulic cavity 106 and a second hydraulic cavity 107, and a connecting cavity 108 disposed between the first hydraulic cavity 106 and the second hydraulic cavity 107. The guide shaft 105 and the first compression member 102 are disposed in the first hydraulic cavity 106, and the sliding shaft 104 and the second compression member 103 are disposed in the connecting cavity 108. The weighted drill rod 3 is axially provided with a connecting cavity 301, and the weighted drill rod 3 is radially provided with a plurality of circulation cavities 302 evenly distributed around the circumference, and the flow test unit 202 is connected to the circulation cavity 302.

[0072] More specifically, Figure 1 As shown, the front end of the first hydraulic chamber 106 is connected to a pilot chamber 109, and the circulating medium flows from the pilot chamber 109 into the first hydraulic chamber 106. The guide shaft 105 includes a stepped column 1051 and a first connecting shaft 1052, on which the first compression member 102 is sleeved.

[0073] Further, as Figure 1 As shown, the sliding shaft 104 includes a trigger section 1041, a connecting section 1042, and a second connecting shaft 1043. A groove 1044 is provided at the front end of the trigger section 1041, and a flange 1053 protruding toward the groove 1044 is provided on the first connecting shaft 1052. The second compression member 103 is sleeved on the second connecting shaft 1043, and the second compression member 103 and the second connecting shaft 1043 are arranged in the second hydraulic chamber 107. When the first compression member 102 is driven to be compressed, the flange 1053 abuts against the groove 1044, so that the sliding shaft 104 slides along the axial direction of the cavity, and the second compression member 103 is compressed. The first compression member 102 and the second compression member 103 of this embodiment adopt telescopic springs. The first compression member 102 and the second compression member 103 are squeezed step by step by the input of the fluid medium, so that the first compression member 102 and the second compression member 103 store energy.

[0074] In addition, Figure 1 As shown, the first hydraulic chamber 106 includes a first sliding section 1061, a second sliding section 1062 and a third sliding section 1063. The diameter of the second sliding section 1062 is larger than that of the first sliding section 1061. The two first compression members 102 are arranged along the axial direction of the second sliding section 1062 and the third sliding section 1063. A first spacer 111 is arranged between the two first compression members 102, and the outer diameter of the first spacer 111 is adapted to the diameter of the third sliding section 1063.

[0075] like Figure 1 As shown, the diameter of the column 1051 is larger than the first connecting shaft 1052, and the first connecting shaft 1052 is also provided with a sealing ring 110, the diameter of the sealing ring 110 is adapted to the first sliding section 1061, and is used to seal the first sliding section 1061. When the guide shaft 105 is driven to move toward the sliding shaft 104, the sealing ring 110 is pushed to move to the second sliding section 1062, and the fluid medium partially flows through the second sliding section 1062 to the third sliding section 1063, and flows along the gap between the sliding shaft 104 and the cavity wall to the outlet end of the connecting shaft (101). The first spacer 111 and the sealing ring 110 of this embodiment are both made of rubber.

[0076] Preferably, if Figure 1As shown, two second compression members 103 are sleeved on the second connecting shaft 1043, and a second spacer 112 is provided between the two second compression members 103. An overflow chamber 113 is provided at one end of the second hydraulic chamber 107 away from the connecting chamber 108. An overflow channel 303 is provided on the weighted drill rod 3, and the overflow chamber 113 is connected to the overflow channel 303. The flow test unit 202 is provided on the overflow channel 303. In this embodiment, the elastic force of the first compression member 102 at the rear end is smaller than that of the first compression member 102 at the front end. The first compression member 102 at the rear end is compressed first, and the first compression member 102 at the front end is compressed later. The system can better adapt to different load conditions, thereby improving the stability of the entire system.

[0077] As a preferred implementation mode, Figure 1 and Figure 2 As shown, the induction component 201 includes a magnetic ring 2011 disposed on the second compression member 103, and a waveguide 2012 inserted in the second connecting shaft 1043. The magnetic ring 2011 is close to the initial section on one side of the connecting section 1042. When the second compression member 103 is in a free state, when a pulse current is added to the waveguide 2012, the controller obtains the current signal of the magnetic ring 2011.

[0078] Furthermore, if Figure 1 and Figure 2 As shown, the overflow channel 303 includes a liquid inlet channel 3031 connected to the overflow chamber 113, a plurality of circulation channels 3032 axially arranged on the weighted drill rod 3, a metering channel 3033 connected to the outlet end of the circulation channel 3032, and a liquid outlet channel 3034 connected to the outlet end of the metering channel 3033. The circulation channel 3032 is connected to the liquid inlet channel 3031. Figure 3 As shown, a flow tube 304 is provided between the overflow chamber 113 and each liquid inlet channel 3031 to facilitate the transportation of the fluid medium.

[0079] like Figure 2 As shown, a plurality of pipelines 4 are provided on the outside of the weighted drill rod 3, and an annular tube 5 is sleeved on the outside of the weighted drill rod 3, and a flow gap 6 is provided between the annular tube 5 and the weighted drill rod 3. The metering channel 3033 and the liquid outlet channel 3034 are formed in the pipeline 4, and the liquid outlet pipeline is connected with the flow gap 6. The outlet end of the flow channel 3032 is arranged in the pipeline 4, and a rotating column 7 is provided in the flow channel 3032. A spiral groove 701 that rises from top to bottom is provided on the outside of the rotating column 7, and the outer diameter of the rotating column 7 is adapted to the inner diameter of the flow channel 3032. When the fluid medium of the liquid inlet channel 3031 flows into the flow channel 3032, when the fluid medium flows along the spiral groove 701, the rotating column 7 is driven to rotate, and an angle sensor for detecting the number of rotations of the rotating shaft is provided in the flow channel 3032.

[0080] This embodiment also provides a collection method of a downhole shock collection system, which uses the downhole shock collection system as above to collect shock force, and includes the following steps:

[0081] Step 1: When the drilling tool is stuck in the well 8, the fluid medium is poured into the cavity, the first compression member 102 is compressed, the guide shaft 105 pushes the sliding shaft 104 to slide, and the second compression member 103 is compressed;

[0082] Step 2: The sensing component 201 monitors the position information of the second compression member 103 and transmits the position information to the controller in the form of a current signal. The controller calculates the compression amount t1 of the second compression member 103 according to the current signal and calculates the lifting force according to the formula F=kΔx;

[0083] The shock force is obtained once every second, and the controller collects the shock force per unit time and forms a curve graph;

[0084] Step 3: The flow testing unit 202 monitors the flow rate of the fluid medium flowing out of the cavity, and calculates the spring compression t2 by collecting the flow rate of the fluid medium per unit time. The controller calculates the difference between t1 and t2, and adjusts the shock force when the difference is greater than a preset threshold.

[0085] When a drill bit is stuck and needs to be struck, the drill bit is pressed down to produce shock:

[0086] Calculation of downforce

[0087] Downward force = downward striking tonnage set on the ground + mud resistance + friction resistance + weight indicator error.

[0088] Initial lifting force = G1-G2+G3+G4+G5+G6.

[0089] Among them, G1---original hanging weight (weight of drilling tools in the well);

[0090] G2---weight of drill string below the jar;

[0091] G3---The shock force required by the shock jar;

[0092] G4---mud resistance, about 5% of the upper pull;

[0093] G5---Friction resistance, which has a greater impact on well inclination and is about 5-20% of the lifting force;

[0094] G6---Indicator weight meter error (determined by the accuracy of the indicator weight meter itself);

[0095] According to the calculation of t1 and t2, the controller calculates the difference between t1 and t2. When the difference is greater than a preset threshold, the initial lifting force value is adjusted. In addition, the calculation of t1 and t2 can be used to provide an adjustment basis for the adjustment of the initial lifting force.

[0096] Step 4: In the upper impact operation: lower the drill bit, and make the weight of the drill bit above the jar 5 to 7 tons to return the jar's "upward impact damping mechanism". Lift the drill bit, adjust the upward impact force according to the impact force collected in the above steps 2 and 3, and then wait for the jar to impact. Repeat the above steps to achieve continuous upward impact operation.

[0097] Downstroke operation: lower the drill bit, and adjust the downstroke force accordingly according to the shock force collected in steps 2 and 3 above. Lift the drill bit up to 5 to 7 tons above the weight of the drill bit on the jar, so that the internal structure of the jar returns to its original position. Immediately lower the drill bit, and then wait for the jar to shock. Repeat the above steps to achieve continuous downstroke operation.

[0098] Repeat steps 1 to 3 until the drilling tool is loosened, the weighted drill rod 3 is engaged with the drilling tool, and the drilling tool is lifted up to the surface of the well.

[0099] The precautions for using the jar of this embodiment are as follows:

[0100] 1. The tool must be tested on the ground before it is lowered into the well and can only be used after passing the test.

[0101] 2. Check whether the oil plugs on the tool are tightened.

[0102] 3. On the turntable, after the tool is connected to the drill bit, remove the clamp and lower it into the well together with the drill bit.

[0103] 4. The tool and drill collar or weighted drill pipe can be combined into a column, but must be connected at the top of the column.

[0104] 5. The tool is best connected and placed above the neutral point of the entire drilling tool assembly so that the tool is under tension.

[0105] 6. The outer diameter of the tool should be less than or equal to the diameter of the drill collar and the lower drill assembly.

[0106] 7. When the tool is working underground, the force applied to the tool by lifting or lowering it is not allowed to exceed the maximum working load it is designed to withstand. When pulling out of the hole, the tool should be in a fully extended state, and the drill pipe mandrel clamp must be installed at the wellhead before it can be safely removed from the turntable to prevent collision.

[0107] 8. Recommended drilling tool combination: upper drilling tool + weighted drill pipe (outer diameter shall not be greater than the outer diameter of the jar) + jar + drill collar (outer diameter shall not be less than the outer diameter of the jar) + lower drilling tool.

[0108] The collection method of the downhole shock collection system of the present embodiment monitors the position information of the second compression component 103 through the sensing component 201, and the controller calculates the lifting force according to the position information, and then monitors the flow rate of the fluid medium flowing out of the cavity, and obtains the spring compression amount t2 by calculation. The controller calculates the difference between t1 and t2, and when the difference is greater than the preset threshold, adjusts the shock force to improve the shock efficiency of the downhole shocker and ensure the shock effect.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A downhole shock collection system, characterized in that: It comprises a shock component (1) and a collection component (2) arranged in the shock device; The shock assembly (1) comprises a connecting shaft (101) having a cavity, a first compression member (102) and a second compression member (103) arranged in the cavity at intervals, and a sliding shaft (104) arranged between the first compression member (102) and the second compression member (103); A guide shaft (105) is also provided in the cavity. When a fluid medium is injected into the cavity, the first compression member (102) is compressed, the guide shaft (105) is driven to push the sliding shaft (104) to slide, and the second compression member (103) is compressed; The collection component (2) comprises a sensing component (201) arranged in the second compression component (103) and the cavity, and a flow testing unit (202) connected to the output end of the cavity; The sensing component (201) is used to monitor the compression amount of the second compression element (103), and the flow testing unit (202) is used to monitor the flow rate of the fluid medium flowing out of the cavity; The shock collection system further comprises a controller, wherein the controller is electrically connected to the sensing component (201) and the flow testing unit (202); The connecting shaft (101) is connected to the weighted drill rod (3).

2. The downhole shock collection system according to claim 1, characterized in that: The cavity comprises a first hydraulic cavity (106) and a second hydraulic cavity (107), and a connecting cavity (108) provided between the first hydraulic cavity (106) and the second hydraulic cavity (107); The guide shaft (105) and the first compression member (102) are arranged in the first hydraulic chamber (106), and the sliding shaft (104) and the second compression member (103) are arranged in the connecting chamber (108); The weighted drill rod (3) is provided with a communication cavity (301) in the axial direction, and a plurality of circulation cavities (302) evenly distributed around the circumference are provided in the radial direction of the weighted drill rod (3); The flow testing unit (202) is in communication with the flow chamber (302).

3. The downhole shock collection system according to claim 2, characterized in that: The front end of the first hydraulic chamber (106) is connected to a pilot chamber (109), and the circulating medium flows from the pilot chamber (109) into the first hydraulic chamber (106); The guide shaft (105) comprises a column platform (1051) arranged in steps and a first connecting shaft (1052), and the first compression member (102) is sleeved on the first connecting shaft (1052).

4. The downhole shock collection system according to claim 3, characterized in that: The sliding shaft (104) comprises a trigger section (1041), a connecting section (1042), and a second connecting shaft (1043); The front end of the trigger section (1041) is provided with a groove (1044), and the first connecting shaft (1052) is provided with a flange (1053) protruding toward the groove (1044); The second compression member (103) is sleeved on the second connecting shaft (1043), and the second compression member (103) and the second connecting shaft (1043) are arranged in the second hydraulic chamber (107); When the first compression member (102) is driven to be compressed, the flange (1053) abuts against the groove (1044), so that the sliding shaft (104) slides axially along the cavity, and the second compression member (103) is compressed.

5. The downhole shock collection system according to claim 4, characterized in that: The first hydraulic chamber (106) comprises a first sliding section (1061), a second sliding section (1062) and a third sliding section (1063); The diameter of the second sliding section (1062) is larger than that of the first sliding section (1061); The two first compression members (102) are arranged along the axial direction of the second sliding section (1062) and the third sliding section (1063); A first spacer sleeve (111) is provided between the two first compression members (102), and the outer diameter of the first spacer sleeve (111) is matched to the diameter of the third sliding section (1063).

6. The downhole shock collection system according to claim 5, characterized in that: The two second compression members (103) are sleeved on the second connecting shaft (1043), and a second spacer sleeve (112) is provided between the two second compression members (103); An overflow chamber (113) is provided at one end of the second hydraulic chamber (107) away from the connecting chamber (108); The weighted drill rod (3) is provided with an overflow channel (303), the overflow chamber (113) is in communication with the overflow channel (303), and the flow test unit (202) is arranged on the overflow channel (303).

7. The downhole shock collection system according to claim 4, characterized in that: The induction component (201) comprises a magnetic ring (2011) arranged on the second compression member (103), and a waveguide (2012) inserted into the second connecting shaft (1043); The magnetic ring (2011) is located at an initial section close to one side of the connecting section (1042). When the second compression member (103) is in a free state, when a pulse current is added to the waveguide (2012), the controller obtains a current signal of the magnetic ring (2011).

8. The downhole shock collection system according to claim 6, characterized in that: The overflow channel (303) comprises a liquid inlet channel (3031) connected to the overflow chamber (113), a plurality of circulation channels (3032) axially arranged on the weighted drill rod (3), a metering channel (3033) connected to the outlet end of the circulation channel (3032), and a liquid outlet channel (3034) connected to the outlet end of the metering channel (3033); The circulation channel (3032) is in communication with the liquid inlet channel (3031).

9. The downhole shock collection system according to claim 8, characterized in that: A plurality of pipelines (4) are arranged outside the weighted drill rod (3), and an annular tube (5) is sleeved outside the weighted drill rod (3), and a flow gap (6) is arranged between the annular tube (5) and the weighted drill rod (3); The metering channel (3033) and the liquid outlet channel (3034) are formed in the pipeline (4), and the liquid outlet pipeline is connected to the flow gap (6); The outlet end of the circulation channel (3032) is arranged in the pipeline (4), a rotating column (7) is arranged in the circulation channel (3032), a spiral groove (701) which rises from top to bottom is arranged on the outer side of the rotating column (7), and the outer diameter of the rotating column (7) is matched with the inner diameter of the circulation channel (3032); When the fluid medium of the liquid inlet channel (3031) flows into the circulation channel (3032), the fluid medium flows along the spiral groove (701), and the rotating column (7) is driven to rotate. An angle sensor for detecting the number of rotations of the rotating shaft is provided in the circulation channel (3032).

10. A collection method of a downhole shock collection system, characterized in that: The method of collecting the jarring force using the downhole jarring collection system according to any one of claims 1 to 9 comprises the following steps: Step 1: When the drilling tool is stuck in the wellbore (8), a fluid medium is poured into the cavity, the first compression member (102) is compressed, the guide shaft (105) pushes the sliding shaft (104) to slide, and the second compression member (103) is compressed; Step 2: The sensing component (201) monitors the position information of the second compression member (103), and transmits the position information to the controller in the form of a current signal, and the controller calculates the compression amount t1 of the second compression member (103) according to the current signal, and calculates the lifting force according to the formula F=kΔx; The shock force is obtained once every second, and the controller collects the shock force per unit time and forms a curve graph; Step 3: the flow testing unit (202) monitors the flow rate of the fluid medium flowing out of the cavity, collects the flow rate of the fluid medium per unit time, calculates the spring compression amount t2, and the controller calculates the difference between t1 and t2, and when the difference is greater than a preset threshold, adjusts the shock force; Step 4: Repeat steps 1 to 3 until the drilling tool is loosened, the weighted drill rod (3) is engaged with the drilling tool, and the drilling tool is lifted up to the well.

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