Well completion pipe string for shale oil and gas well and using method of well completion pipe string

Abstract

The invention relates to the technical field of gas lift oil extraction, in particular to a well completion pipe string for a shale oil and gas well and a using method thereof, and the using method comprises the steps that oil extraction gas is continuously injected into an annular space of an oil pipe and a sleeve and is continuously injected into the oil pipe through gas lift valves in all open states; when the pressure of the well bottom reaches a preset pressure value, the single-channel rotary valve is controlled to be opened in a constant-pressure forward rotation mode, and oil flows into the oil pipe; determining a yield analysis mode according to the oil yield state; in analysis of oil gravel parameters, the gas lift valve adjusting mode is determined according to the oil gravel state; in the adjustment of the opening parameters of the gas lift valves, the opening parameters of the gas lift valves are adjusted according to the growth parameters; in the adjustment of the circulation opening frequency of the gas lift valve, the circulation opening frequency of the gas lift valve is adjusted according to the particle size difference value; the precision degree of gas lift control is improved, and then the gas lift efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas lift oil production, and in particular to a completion string for a shale oil and gas well and a use method thereof. Background Art

[0002] Gas lift oil production is a method of lifting the crude oil in the well to the surface by injecting high-pressure gas from the ground. The flow properties and coordination principles of this method are basically the same as those of self-flowing wells. Among them, the gas lift process parameters need to be targeted at the actual working conditions of shale oil and gas wells. Combined with the production fluctuations and long-term production stability requirements during the gas lift process, the application of fine pressure controlled gas lift completion production tubing in shale oil and gas production is crucial.

[0003] Chinese patent publication number CN108386163A discloses a gas lift induced blowout process and a gas lift induced blowout system, wherein the gas lift induced blowout system includes casing, oil pipe, injection valve and air inlet pipe, the casing is located in the well body, the oil pipe is sleeved in the casing, the injection valve is arranged on the oil pipe and can be connected with the oil pipe; one end of the air inlet pipe is connected with the injection valve, and the other end extends out of the wellhead and is connected with the gas source. The gas lift induced blowout system and gas lift induced blowout method provided by the invention presses gas lift gas into the oil pipe through a sealed pipeline composed of an air inlet pipe and an injection valve, isolates the annulus between the oil pipe and the casing, and the annulus protection liquid in the annulus will not leak into the oil pipe. After the gas lift is completed, there is no need to inject the annulus protection liquid into the annulus again, saving resources and reducing costs; it can be seen that the above technical solution has the following problems: it does not take into account the influence of the gas lift process parameters on the gas lift effect, resulting in that the gas lift process parameters may not meet the needs of actual production. Summary of the invention

[0004] To this end, the present invention provides a completion string for shale oil and gas wells and a method of using the same, so as to overcome the problem that the prior art does not take into account the influence of gas lift process parameters on the gas lift effect, resulting in the gas lift process parameters may not meet the actual production needs.

[0005] To achieve the above object, the present invention provides a method for using a completion string for a shale oil and gas well, comprising: The oil production gas is continuously injected into the annular space between the tubing and the casing, and is continuously injected into the tubing through each gas lift valve in the open state; When the pressure at the bottom of the well reaches the preset pressure value, the single-channel rotary valve is controlled to rotate forward at a constant pressure to open, allowing the oil to flow into the oil pipe; Determine the oil production state according to the oil production reference value and the oil fluctuation reference value, and determine the production analysis method according to the oil production state; In the analysis of the oil flow parameters, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; In the analysis of oil gravel parameters, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state; In adjusting the opening parameters of the gas lift valves, adjusting the opening parameters of each gas lift valve according to the growth parameters; In adjusting the cyclic opening frequency of the gas lift valve, the cyclic opening frequency of the gas lift valve is adjusted according to the particle size difference.

[0006] Furthermore, the production analysis method is determined according to the oil production status, including analyzing the oil gravel parameters or analyzing the oil flow parameters.

[0007] Furthermore, the oil production state is determined based on the oil production reference value and the oil fluctuation reference value, and the oil production state is a first oil production state in which the oil production reference value is less than a preset oil production reference value, or a second oil production state in which the oil production reference value is greater than or equal to the preset oil production reference value and the oil fluctuation reference value is greater than the preset oil fluctuation reference value.

[0008] Furthermore, under the first analysis condition, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; The treatment method is to adjust the gas injection volume, or conduct manual inspection; The oil flow parameters include oil temperature, oil viscosity and oil impurity content. Each type of oil flow parameter has a preset threshold range. The first analysis condition is that the oil production state is the first oil production state.

[0009] Further, if the number of dangerous flow parameters is the standard number, the gas injection amount is increased and adjusted; If the number of hazardous flow parameters is greater than the standard number, manual investigation is performed.

[0010] Further, under the second analysis condition, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state to adjust the opening parameter of the gas lift valve or adjust the cycle opening frequency of the gas lift valve; The second analysis condition is that the oil production state is a second oil production state.

[0011] Further, the oil grit state includes a first oil grit state in which the grit particle size characterization value is greater than a preset grit particle size characterization value and the grit particle size uniform value is greater than the preset grit particle size uniform value, and a second oil grit state in which the grit particle size characterization value is greater than the preset grit particle size characterization value and the grit particle size uniform value is less than the preset grit particle size uniform value; Oil grit parameters include grit particle size characterization value and grit particle size uniform value.

[0012] Furthermore, in adjusting the opening parameters of the gas lift valves, the growth parameters of the gravel particle size characterization values ​​are detected, and the opening parameters of the gas lift valves are increased and adjusted according to the growth parameters; The increase in the opening parameter is positively correlated with the growth parameter; The growth parameter is the difference between the gravel particle size characterization value corresponding to the current monitoring period and the gravel particle size characterization value corresponding to the most recent monitoring period.

[0013] Furthermore, in adjusting the cyclic opening frequency of the gas lift valve, the difference between the uniform value of the sand and gravel particle size and the preset uniform value of the sand and gravel particle size is detected and recorded as the particle size difference, and the cyclic opening frequency of the gas lift valve is increased and adjusted according to the particle size difference; The increase adjustment amount of the cycle opening frequency is positively correlated with the particle size difference.

[0014] Furthermore, the oil production gas is natural gas.

[0015] Further, oil pipeline; The packer is sleeved outside the side wall of the oil pipe to isolate the oil layer and the formation between the oil pipe and the casing; A plurality of gas lift valves, each of which is arranged on the outer wall of the oil pipe and is used to inject oil production gas into the oil pipe; A vibration detection device, which is arranged on the side wall of the oil pipe and located above the packer, and is used to detect the vibration frequency of the oil pipe; A single-channel rotary valve is arranged at the bottom of the oil pipe and is used to allow oil to enter the oil pipe through an open state.

[0016] Furthermore, each gas lift valve is arranged at a different height and can be controlled individually.

[0017] Furthermore, the material of the packer is stainless steel, and the outer surface of the packer is treated with plasma ions.

[0018] Compared with the prior art, the beneficial effect of the present invention lies in that, in the technical solution of the present invention, the oil production status is determined according to the oil production reference value and the oil fluctuation reference value, the current gas lift effect is effectively reflected by the oil production status, and the production analysis method is effectively selected according to the oil production status, so that the selection of the production analysis method can be more in line with the actual working scenario, further improving the analysis efficiency of the production analysis method for the current gas lift status, thereby improving the refinement of the gas lift control of the present invention.

[0019] Furthermore, the oil flow parameters in the present invention include oil temperature, oil viscosity and oil impurity content. Through the analysis of the oil flow parameters, the flow performance of the current oil can be effectively characterized, avoiding the problem of poor accuracy in determining the flow performance due to the characterization of a single parameter, thereby improving the gas injection volume regulation efficiency of the present invention and further improving the gas lift efficiency.

[0020] Furthermore, in the present invention, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value. The oil gravel state effectively reflects the gravel situation in the oil, and the reflected gravel situation is not the detection result of a single moment. Therefore, the detection accuracy is improved, and the gas lift valve adjustment mode is determined according to the oil gravel state, so that the selection of the gas lift valve adjustment mode is more in line with the actual production process, thereby improving the effectiveness of the gas lift valve adjustment mode, and further improving the refinement of the gas lift control of the present invention.

[0021] Furthermore, in the present invention, in the regulation of the cyclic opening frequency of the gas lift valve, the difference between the uniform value of the gravel particle size and the preset uniform value of the gravel particle size is detected, and the cyclic opening frequency of the gas lift valve is increased and adjusted according to the particle size difference. The particle size difference reflects the uniformity of the gravel particle size in the oil, and different amplitudes of increasing the cyclic opening frequency are selected according to different uniformities. By changing the cyclic opening frequency to adjust the opened gas lift valve, the influence of gravel on the working efficiency of the gas lift valve is reduced, thereby further improving the gas lift efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a method for using a completion string for a shale oil and gas well according to the present invention; Figure 2 This is a flow chart of the present invention for determining a production analysis method according to the oil production status; Figure 3 This is a flow chart of determining the gas lift valve adjustment method according to the oil gravel state of the present invention; Figure 4 It is a structural schematic diagram of the completion string of the present invention; In the figure: tubing 1, gas lift valve 2, packer 3, casing 4, single-channel rotary valve 5. DETAILED DESCRIPTION

[0023] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0025] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0026] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figures 1 to 3 As shown, the present invention provides a method for using a completion string for a shale oil and gas well, comprising: The oil production gas is continuously injected into the annular space between the tubing and the casing, and is continuously injected into the tubing through each gas lift valve in the open state; When the pressure at the bottom of the well reaches the preset pressure value, the single-channel rotary valve is controlled to rotate forward at a constant pressure to open, allowing the oil to flow into the oil pipe; Determine the oil production state according to the oil production reference value and the oil fluctuation reference value, and determine the production analysis method according to the oil production state; In the analysis of the oil flow parameters, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; In the analysis of oil gravel parameters, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state; In adjusting the opening parameters of the gas lift valves, adjusting the opening parameters of each gas lift valve according to the growth parameters; In adjusting the cyclic opening frequency of the gas lift valve, the cyclic opening frequency of the gas lift valve is adjusted according to the particle size difference.

[0028] Specifically, the production analysis method is determined according to the oil production status, including analyzing the oil gravel parameters or analyzing the oil flow parameters.

[0029] Specifically, the oil production state is determined based on the oil production reference value and the oil fluctuation reference value. The oil production state is a first oil production state in which the oil production reference value is less than a preset oil production reference value, or a second oil production state in which the oil production reference value is greater than or equal to the preset oil production reference value and the oil fluctuation reference value is greater than the preset oil fluctuation reference value.

[0030] Among them, the present invention applies a cyclic monitoring cycle, and the duration of the monitoring cycle can be determined by the user. A monitoring cycle duration is provided, and the monitoring cycle is 1h. Each monitoring cycle corresponds to an oil production reference value and an oil fluctuation reference value. At the end of each monitoring cycle, a production analysis method is determined. The method for confirming the oil production reference value is to detect the oil output once every 10 minutes within a single monitoring cycle. The oil output is the oil output of the shale oil and gas well per unit time. The average value of all oil outputs monitored within the monitoring cycle is recorded as the oil production reference value. The method for confirming the oil fluctuation reference value is to record the oil fluctuation reference value as S, and the calculation formula of S is:

[0031] Among them, hi is the oil output monitored for the ith time in a single monitoring cycle, h0 is the oil production reference value, and n is the total number of oil outputs monitored in a single monitoring cycle; the values ​​of the preset oil production reference value and the preset oil fluctuation reference value can be set by the user according to the actual application scenario. The greater the user's demand for oil production and oil production stability, the larger the value of the preset oil production reference value, and the smaller the value of the preset oil fluctuation reference value. A preset oil production reference value and a preset oil fluctuation reference value are provided. The value of the preset oil production reference value can be determined by the user according to the historical mining process, and the average value of the oil production reference value that meets the user's mining needs during the mining process is recorded as the preset oil production reference value. It can be understood that the user can screen some records of the historical mining process according to his own experience to screen out the historical mining process of the oil well that is closest to the geological conditions and mining conditions of the current shale oil and gas wells. This is content that is easy to understand for technicians in this field and will not be repeated here. The value of the preset oil fluctuation reference value is 20% of h0.

[0032] Specifically, under the first analysis condition, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; The treatment method is to adjust the gas injection volume, or conduct manual inspection; The manual troubleshooting is to perform troubleshooting on the completion string and related oil production equipment by the user, which is already known to those skilled in the art and will not be elaborated here.

[0033] The oil flow parameters include oil temperature, oil viscosity and oil impurity content. Each type of oil flow parameter has a preset threshold range. It can be understood that setting a preset threshold range that meets user needs for different oil flow parameters is something that can be understood by those skilled in the art and will not be elaborated here. The user can determine the preset threshold range that meets the actual application scenario based on the historical completion string usage records and operating experience, and there is no need to elaborate here.

[0034] The first analysis condition is that the oil production state is the first oil production state.

[0035] Specifically, if the number of dangerous flow parameters is the standard number, an increase adjustment is made with respect to the gas injection volume; If the number of hazardous flow parameters is greater than the standard number, manual investigation is performed.

[0036] Among them, the increase in gas injection volume is negatively correlated with the reference value of oil production, and the standard number is 1. If the number of dangerous flow parameters is 0, there is no need to select a response treatment method.

[0037] Specifically, under the second analysis condition, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state to adjust the opening parameter of the gas lift valve or adjust the cycle opening frequency of the gas lift valve; The second analysis condition is that the oil production state is a second oil production state.

[0038] Specifically, the oil grit state includes a first oil grit state in which the grit particle size characterization value is greater than a preset grit particle size characterization value and the grit particle size uniform value is greater than the preset grit particle size uniform value, and a second oil grit state in which the grit particle size characterization value is greater than the preset grit particle size characterization value and the grit particle size uniform value is less than the preset grit particle size uniform value; Oil grit parameters include grit particle size characterization value and grit particle size uniform value.

[0039] In the first oil gravel state, the gas lift valve adjustment method is to increase the opening parameter of the gas lift valve; In the second oil gravel state, the gas lift valve adjustment method is to increase the cycle opening frequency of the gas lift valve; Among them, a preset weight of gravel in the produced oil is obtained once. The acquisition method can be to separate the gravel in the produced oil through oil separation and sand removal equipment or to use the gravel particle size characterization value of the cyclone desander. The value of the preset weight can be set by the user according to the actual scenario. The greater the user's demand for the accuracy of the oil gravel state, the greater the value of the preset weight. A certain amount of gravel is taken for particle size detection. The method of particle size detection is easy to understand for technicians in this field and is not limited here. The uniform value of gravel particle size is recorded as P, P = (H1 / H0) × 0.5 + (H2 / H0) × 0.5, wherein H1 is the maximum particle size detected minus the particle size The difference between the average value, H2 is the absolute value of the difference between the minimum particle size detected and the average particle size, H0 is the average particle size, the average particle size is set to the gravel particle size characterization value, the preset gravel particle size characterization value and the preset gravel particle size uniform value can be set by the user according to the actual application scenario. The greater the user's demand for oil collection efficiency, the smaller the value of the preset gravel particle size characterization value. This is easy for technicians in this field to understand. A method for setting a preset gravel particle size uniform value is provided. The average value of the gravel particle size uniform value corresponding to the mining records that meet the user's mining efficiency requirements in the historical mining records is recorded as the preset gravel particle size uniform value. Specifically, in adjusting the opening parameters of the gas lift valves, the growth parameters of the gravel particle size characterization values ​​are detected, and the opening parameters of each gas lift valve are increased and adjusted according to the growth parameters; The increase in the opening parameter is positively correlated with the growth parameter; The growth parameter is the difference between the gravel particle size characterization value corresponding to the current monitoring period and the gravel particle size characterization value corresponding to the most recent monitoring period.

[0040] Specifically, in adjusting the cyclic opening frequency of the gas lift valve, the difference between the uniform value of the sand and gravel particle size and the preset uniform value of the sand and gravel particle size is detected and recorded as the particle size difference, and the cyclic opening frequency of the gas lift valve is increased and adjusted according to the particle size difference; The increase adjustment amount of the cycle opening frequency is positively correlated with the particle size difference.

[0041] The difference between the uniform value of the gravel particle size and the preset uniform value of the gravel particle size is the difference obtained by subtracting the uniform value of the gravel particle size from the preset uniform value of the gravel particle size.

[0042] The opening parameter is the injection pressure of the gas lift valve. In the present invention, the gas lift valve adopts a cyclic opening mode, wherein the gas lift valves are sorted in descending order of installation height. For example, the gas lift valve closest to the surface is numbered 1, and the gas lift valve closest to the gas lift valve numbered 1 is numbered 2, and so on. It is not elaborated here. The cyclic opening mode is the cyclic opening and closing state of the gas lift valves with odd numbers and the gas lift valves with even numbers, that is, the gas lift valves with odd numbers are opened at the same time, and at this time the gas lift valves with even numbers are all closed. After a preset time, the gas lift valves with odd numbers are all closed, and at this time the gas lift valves with even numbers are all opened, and the above actions are repeated. The cyclic opening frequency is the number of times the odd-numbered gas lift valves are opened within a certain period of time. The increase in the cyclic opening frequency is achieved by reducing the preset time.

[0043] Specifically, the oil production gas is natural gas.

[0044] See also Figure 4 As shown, it is a schematic diagram of the structure of the completion string of the present invention, and the completion string includes: Oil pipe 1; The packer 3 is sleeved outside the side wall of the oil pipe 1 to seal the oil layer and the formation between the oil pipe 1 and the casing 4; A plurality of gas lift valves 2, each of which is arranged on the outer wall of the oil pipe 1 and is used to inject oil production gas into the oil pipe 1; A vibration detection device, which is arranged on the side wall of the oil pipe and located above the packer, and is used to detect the vibration frequency of the oil pipe; The single-channel rotary valve 5 is arranged at the bottom of the oil pipe 1 to allow oil to enter the oil pipe 1 in an open state.

[0045] Specifically, each gas lift valve 2 is arranged at a different height and can be controlled individually.

[0046] A configuration method of a gas lift valve 2 is provided. The number of the gas lift valves 2 is 6, and the distance between any two adjacent gas lift valves is the same.

[0047] Specifically, the material of the packer 3 is stainless steel, and the outer surface of the packer 3 is treated with plasma ions.

[0048] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for using a completion string for a shale oil and gas well, characterized in that: include: The oil production gas is continuously injected into the annular space between the tubing and the casing, and is continuously injected into the tubing through each gas lift valve in the open state; When the pressure at the bottom of the well reaches the preset pressure value, the single-channel rotary valve is controlled to rotate forward at a constant pressure to open, allowing the oil to flow into the oil pipe; Determine the oil production state according to the oil production reference value and the oil fluctuation reference value, and determine the production analysis method according to the oil production state; In the analysis of the oil flow parameters, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; In the analysis of oil gravel parameters, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state; In adjusting the opening parameters of the gas lift valves, adjusting the opening parameters of each gas lift valve according to the growth parameters; In adjusting the cyclic opening frequency of the gas lift valve, the cyclic opening frequency of the gas lift valve is adjusted according to the particle size difference.

2. The method for using a completion string for a shale oil and gas well according to claim 1, characterized in that: The production analysis method is determined according to the oil production status, including analysis of oil gravel parameters or analysis of oil flow parameters.

3. The method for using a completion string for a shale oil and gas well according to claim 2, characterized in that: The oil production state is determined based on the oil production reference value and the oil fluctuation reference value. The oil production state is a first oil production state in which the oil production reference value is less than a preset oil production reference value, or a second oil production state in which the oil production reference value is greater than or equal to the preset oil production reference value and the oil fluctuation reference value is greater than the preset oil fluctuation reference value.

4. The method for using a completion string for a shale oil and gas well according to claim 3, characterized in that: Under the first analysis condition, threshold analysis is performed on each oil flow parameter, and the oil flow parameters that are not within the preset threshold range are recorded as dangerous flow parameters, and the response method is determined according to the number of dangerous flow parameters; The treatment method is to adjust the gas injection volume, or conduct manual inspection; The oil flow parameters include oil temperature, oil viscosity and oil impurity content. Each type of oil flow parameter has a preset threshold range. The first analysis condition is that the oil production state is the first oil production state.

5. The method for using a completion string for a shale oil and gas well according to claim 3, characterized in that: If the number of dangerous flow parameters is the standard number, the gas injection volume is increased and adjusted; If the number of hazardous flow parameters is greater than the standard number, manual investigation is performed.

6. The method for using a completion string for a shale oil and gas well according to claim 3, characterized in that: Under the second analysis condition, the oil gravel state is determined according to the gravel particle size characterization value and the gravel particle size uniform value, and the gas lift valve adjustment method is determined according to the oil gravel state, that is, adjusting the opening parameter of the gas lift valve or adjusting the cycle opening frequency of the gas lift valve; The second analysis condition is that the oil production state is a second oil production state.

7. The method for using a completion string for a shale oil and gas well according to claim 6, characterized in that: The oil grit state includes a first oil grit state in which the grit particle size characterization value is greater than a preset grit particle size characterization value and the grit particle size uniform value is greater than the preset grit particle size uniform value, and a second oil grit state in which the grit particle size characterization value is greater than the preset grit particle size characterization value and the grit particle size uniform value is less than the preset grit particle size uniform value; Oil grit parameters include grit particle size characterization value and grit particle size uniform value.

8. The method for using a completion string for a shale oil and gas well according to claim 7, characterized in that: In adjusting the opening parameters of the gas lift valves, the growth parameters of the gravel particle size characterization values ​​are detected, and the opening parameters of each gas lift valve are increased and adjusted according to the growth parameters; The increase in the opening parameter is positively correlated with the growth parameter; The growth parameter is the difference between the gravel particle size characterization value corresponding to the current monitoring period and the gravel particle size characterization value corresponding to the most recent monitoring period.

9. The method for using a completion string for a shale oil and gas well according to claim 8, characterized in that: In adjusting the cyclic opening frequency of the gas lift valve, the difference between the uniform value of the sand and gravel particle size and the preset uniform value of the sand and gravel particle size is detected and recorded as the particle size difference, and the cyclic opening frequency of the gas lift valve is increased and adjusted according to the particle size difference; The increase adjustment amount of the cycle opening frequency is positively correlated with the particle size difference.

10. The method for using a completion string for a shale oil and gas well according to claim 9, characterized in that: The oil production gas is natural gas.

11. A completion string using the method according to any one of claims 1 to 10, characterized in that: include: Oil pipes; The packer is sleeved outside the side wall of the oil pipe to isolate the oil layer and the formation between the oil pipe and the casing; A plurality of gas lift valves, each of which is arranged on the outer wall of the oil pipe and is used to inject oil production gas into the oil pipe; A vibration detection device, which is arranged on the side wall of the oil pipe and located above the packer, and is used to detect the vibration frequency of the oil pipe; A single-channel rotary valve is arranged at the bottom of the oil pipe and is used to allow oil to enter the oil pipe through an open state.

12. The completion string according to claim 11, characterized in that: Each gas lift valve is set at a different height and can be controlled individually.

13. The completion string according to claim 12, characterized in that: The material of the packer is stainless steel, and the outer surface of the packer is treated with plasma ions.

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