A method for determining effective drilling interval based on oil pressure threshold

Abstract

The present invention discloses a method for determining an effective drilling interval based on an oil pressure threshold, comprising the following steps: drilling according to a research area, obtaining the start and end time intervals of each downward drilling, obtaining oil pressure data during the drilling process and drawing a diagram of oil pressure detection data changes; obtaining an oil pressure threshold according to the oil pressure detection data change diagram and the start and end time intervals of each downward drilling; obtaining an effective drilling interval range according to the oil pressure threshold, and judging an effective drilling interval for drilling again according to the effective drilling interval range. The present invention relies on monitoring the oil pressure threshold during the drilling process of a drilling rig to quickly and effectively determine its effective drilling interval, thereby ensuring the accuracy of the hole depth data when calculating the actual hole depth and reducing manual errors; no manual recording is required at all times during the drilling rig construction process, thereby reducing labor costs or shortening construction periods.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering investigation, and in particular relates to a method for determining an effective drilling interval based on an oil pressure threshold. Background Art

[0002] As my country's comprehensive national strength continues to increase, investment in infrastructure has gradually increased, especially in public infrastructure projects such as roads, water conservancy and hydropower. Geological surveys can correctly reflect the engineering geological conditions of the site, combine the design and on-site construction conditions, conduct technical evaluations of different survey stages, and provide guidance for the construction of infrastructure, mines, slopes and other projects, serving the entire process of engineering construction. Geophysical prospecting and drilling are currently the main methods of engineering geological exploration. Drilling uses deep drilling machinery and technology to obtain underground specimens and obtain the actual situation of the stratigraphic profile. It is the most direct and effective method in geological exploration and a key technology for geological exploration in unknown areas. Drilling is widely used in mine production such as geological anomaly investigation and gas extraction. Therefore, the effective acquisition of geological information often depends on the quality of the borehole. The borehole depth is an important indicator, and determining the effective drilling time interval of the drill rig is an important step in calculating the borehole depth. Many domestic and foreign experts have also conducted correlation studies on important borehole depth data. Many domestic and foreign experts have also conducted correlation studies on important borehole depth data. For example, Sun Zhifei et al. determined the borehole depth by determining the number of drill rods by manual or instrument counting. Wang Hongguang et al. took rotary drilling rigs as the research object and used various solutions such as incremental encoders to detect and obtain the movement depth of the drill rod.

[0003] The monitoring and management of drilling construction quality and hole depth gradually showed many shortcomings: 1) The manual counting hole depth method has a high probability of error and low accuracy of hole depth data in the absence of on-site management; 2) The traditional counting rod method is time-consuming and labor-intensive, while the instrument counting method has high requirements for both manual and drilling drilling technology and is easily affected by human factors. Therefore, it is particularly important to accurately determine the effective drilling interval based on the oil pressure monitoring data change law diagram. Summary of the invention

[0004] The purpose of the present invention is to propose a method for determining an effective drilling interval based on an oil pressure threshold, which can quickly and accurately determine the effective drilling interval of a drilling rig, thereby further being used to calculate and obtain the actual drilling depth.

[0005] To achieve the above object, the present invention provides a method for determining an effective drilling interval based on an oil pressure threshold, comprising the following steps:

[0006] Drill holes according to the study area, obtain the start and end time intervals of each downward drilling, obtain the oil pressure data during the drilling process and draw a diagram of the change pattern of the oil pressure detection data;

[0007] Obtaining an oil pressure threshold value according to the oil pressure detection data variation regularity diagram and the start and end time intervals of each downward drilling;

[0008] The effective drilling interval range is obtained according to the oil pressure threshold, and the effective drilling interval for drilling again is determined according to the effective drilling interval range.

[0009] Optionally, the oil pressure detection data variation pattern diagram includes: plotting the oil pressure detection data variation pattern diagram based on the recorded time as the horizontal axis and the corresponding oil pressure data as the vertical axis.

[0010] Optionally, according to the oil pressure detection data variation pattern diagram, a number of effective drilling intervals are divided according to the start and end time intervals of each downward drilling.

[0011] Optionally, obtaining the oil pressure threshold according to the oil pressure detection data change law diagram specifically includes: the oil pressure average value and the oil pressure first sudden change rate. The oil pressure average value in the effective drilling range is obtained according to the oil pressure detection data change law diagram, and the oil pressure first sudden change rate is obtained according to the oil pressure detection data change law diagram.

[0012] Optionally, obtaining the range of the effective drilling interval according to the oil pressure threshold specifically includes: comparing the data sizes of the oil pressure average values ​​of several effective drilling intervals, and taking the interval formed by the maximum and minimum values ​​after comparison as the range of the oil pressure average values ​​of several effective drilling intervals; comparing the data in the first sudden change rates of the oil pressure of several effective drilling intervals, and taking the minimum value after comparison as the minimum value of the first sudden change rates of the oil pressure of several effective drilling intervals; obtaining the range of the effective drilling interval according to the range of the oil pressure average values ​​of the several effective drilling intervals and the minimum values ​​of the first sudden change rates of the oil pressure of the several effective drilling intervals.

[0013] Optionally, the effective drilling interval range is obtained based on the range of the average oil pressure values ​​of the several effective drilling intervals and the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, specifically including: based on the oil pressure detection data change law diagram, when the data in the oil pressure detection data change law diagram simultaneously satisfies the range of the average oil pressure values ​​of the several effective drilling intervals and is not less than the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, the corresponding time period is the effective drilling interval for re-drilling.

[0014] Technical effect of the invention: The invention discloses a method for determining an effective drilling interval based on an oil pressure threshold. The invention relies on monitoring the oil pressure threshold during the drilling process of the drilling rig to achieve rapid and effective determination of the effective drilling interval, thereby ensuring the accuracy of the hole depth data when calculating the actual hole depth and reducing manual errors; during the drilling rig construction process, there is no need for manual recording at all times, thereby reducing labor costs or shortening construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 It is a flow chart of a method for determining an effective drilling interval based on an oil pressure threshold according to an embodiment of the present invention;

[0017] Figure 2 This is a graph showing the displacement and oil pressure monitoring data of the on-site drilling process of the embodiment ZK1 of the present invention over time;

[0018] Figure 3 This is a graph showing the displacement and oil pressure monitoring data of the on-site drilling process of embodiment ZK2 of the present invention changing over time. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0021] like Figure 1 As shown, this embodiment provides a method for determining an effective drilling interval based on an oil pressure threshold, comprising the following steps:

[0022] Drill holes according to the study area, obtain the start and end time intervals of each downward drilling, obtain the oil pressure data during the drilling process and draw a diagram of the change pattern of the oil pressure detection data;

[0023] Obtaining an oil pressure threshold value according to the oil pressure detection data variation regularity diagram and the start and end time intervals of each downward drilling;

[0024] The effective drilling interval range is obtained according to the oil pressure threshold, and the effective drilling interval for drilling again is determined according to the effective drilling interval range.

[0025] According to a further optimization scheme, the oil pressure detection data variation pattern diagram includes: using the recorded time as the horizontal coordinate and the corresponding oil pressure data as the vertical coordinate to draw the oil pressure detection data variation pattern diagram.

[0026] A further optimization scheme is to divide a number of effective drilling intervals according to the start and end time intervals of each downward drilling according to the oil pressure detection data change law diagram.

[0027] A further optimization scheme, obtaining the oil pressure threshold according to the oil pressure detection data change law diagram specifically includes: the oil pressure average value and the oil pressure first sudden change rate. The oil pressure average value within the effective drilling range is obtained according to the oil pressure detection data change law diagram, and the oil pressure first sudden change rate is obtained according to the oil pressure detection data change law diagram.

[0028] A further optimization scheme, obtaining the effective drilling interval range according to the oil pressure threshold specifically includes: comparing the data size of the oil pressure average values ​​of several effective drilling intervals, and taking the interval formed by the maximum and minimum values ​​after comparison as the range of the oil pressure average values ​​of several effective drilling intervals; comparing the data in the first sudden change rates of the oil pressures of several effective drilling intervals, and taking the minimum value after comparison as the minimum value of the first sudden change rates of the oil pressures of several effective drilling intervals; obtaining the effective drilling interval range according to the range of the oil pressure average values ​​of the several effective drilling intervals and the minimum values ​​of the first sudden change rates of the oil pressures of the several effective drilling intervals.

[0029] A further optimization scheme is to obtain the effective drilling interval range according to the range of the average oil pressure values ​​of the several effective drilling intervals and the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, specifically including: based on the oil pressure detection data change law diagram, when the data in the oil pressure detection data change law diagram simultaneously satisfies the range of the average oil pressure values ​​of the several effective drilling intervals and is not less than the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, the corresponding time period is the effective drilling interval for drilling again.

[0030] 1) When drilling for the first time in the study area (denoted as ZK1), an intelligent device that monitors the drilling parameters of the drilling rig in real time is used to monitor and record the start and end time intervals of each downward drilling. The oil pressure data is collected and summarized. With time as the horizontal axis and oil pressure as the vertical axis, a diagram of the change pattern of the oil pressure monitoring data during the on-site drilling process is drawn, as shown in Figure 1. Figure 2 shown.

[0031] 2) Record the start and end time intervals of several downward drillings of the borehole ZK1 as effective drilling intervals b1, b2, ..., b k .

[0032] 3) In the effective interval b1, two oil pressure thresholds are obtained respectively, namely Oil pressure average value x1, first sudden change in oil pressure Rate (within 5s) y1;

[0033] Similarly, the effective drilling intervals b2, b3, ..., b k The threshold value, that is, the average oil pressure x2, x3, ..., x k and Oil Pressure first mutation change rate (within 5s)y2, y3, ..., y k .

[0034] 4) Assume k effective drilling intervals The average oil pressure range is P1, oil pressure in k effective drilling intervals First breakthrough Change The minimum value of the rate of change (within 5s) is P2, and the formula is as follows:

[0035] P1=[min(x1,x2,x3,……,x k ),max(x1,x2,x3,……,x k )] (1)

[0036] P2=min(y1,y2,y3,……,y k ) (2)

[0037] 5) When drilling is required again in the same study area (ZK2), the oil pressure monitoring data of the on-site drilling process is compared, such as Figure 3 As shown, Oil pressure average when belong P1 range, and Oil pressure first sudden change rate (within 5s) When it is greater than P2, this time period is the effective drilling interval during drilling (ZK2) construction.

[0038] 6) Repeat step 5) in the same study area to determine the effective drilling intervals for the construction of the remaining boreholes (ZK3, ZK4, ...).

[0039] The present invention discloses a method for determining an effective drilling interval based on an oil pressure threshold value. The present invention relies on monitoring the oil pressure threshold value during the drilling process of a drilling rig to achieve rapid and effective determination of the effective drilling interval, thereby ensuring the accuracy of hole depth data when calculating the actual hole depth and reducing manual errors; during the drilling rig construction process, manual recording is not required at all times, thereby reducing labor costs or shortening construction period.

[0040] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining an effective drilling interval based on an oil pressure threshold, characterized in that: include: Drilling is performed according to the research area, the start and end time intervals of each downward drilling are obtained, the oil pressure data during the drilling process is obtained and a diagram of the change law of the oil pressure detection data is drawn, and according to the diagram of the change law of the oil pressure detection data, a number of effective drilling intervals are divided according to the start and end time intervals of each downward drilling; Obtaining an oil pressure threshold value according to the oil pressure detection data variation regularity diagram and the start and end time intervals of each downward drilling; Obtaining an effective drilling interval range according to the oil pressure threshold, and judging an effective drilling interval for drilling again according to the effective drilling interval range, wherein the oil pressure threshold is an average oil pressure value and a first sudden change rate of the oil pressure; Obtaining the effective drilling interval range according to the oil pressure threshold specifically includes: comparing the data size of the oil pressure average values ​​of several effective drilling intervals, and taking the interval formed by the maximum value and the minimum value after comparison as the range of the oil pressure average values ​​of several effective drilling intervals; comparing the data in the first sudden change rate of the oil pressure of several effective drilling intervals, and taking the minimum value after comparison as the minimum value of the first sudden change rate of the oil pressure of several effective drilling intervals; obtaining the effective drilling interval range according to the range of the oil pressure average values ​​of the several effective drilling intervals and the minimum value of the first sudden change rate of the oil pressure of the several effective drilling intervals; The effective drilling interval range is obtained according to the range of the average oil pressure values ​​of the several effective drilling intervals and the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, specifically including: based on the oil pressure detection data change law diagram, when the data in the oil pressure detection data change law diagram simultaneously satisfies the range of the average oil pressure values ​​of the several effective drilling intervals and is not less than the minimum values ​​of the first sudden change rate of the oil pressure in the several effective drilling intervals, the corresponding time period is the effective drilling interval for drilling again.

2. The method for determining an effective drilling interval based on an oil pressure threshold according to claim 1, characterized in that: The oil pressure detection data variation pattern diagram comprises: using the recorded time as the horizontal coordinate and the corresponding oil pressure data as the vertical coordinate to draw the oil pressure detection data variation pattern diagram.

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