A method for calculating effective hole depth based on displacement and oil pressure monitoring values

Abstract

The present invention discloses a method for calculating effective hole depth based on displacement and oil pressure monitoring values. The present invention belongs to the field of geotechnical engineering survey, and includes: obtaining the working parameters of the drilling rig, and drawing a change diagram based on the working parameters; combining the change diagram, and obtaining the effective interval of the drilling rig through a method for determining the effective drilling interval based on the oil pressure threshold; wherein the working parameters include: displacement data and oil pressure monitoring values; the effective interval includes: the effective interval of the soil layer and the effective interval of the rock layer; based on the displacement data and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the displacement data and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth. The present invention can display the drilling footage length of the drilling rig in real time and calculate the effective drilling depth, reduce the human influence of manual or instrument counting methods, and improve work efficiency.

Description

Technical Field

[0001] The invention belongs to the field of geotechnical engineering investigation, and in particular relates to an effective hole depth calculation method based on displacement and oil pressure monitoring values. Background Art

[0002] With the promotion of my country's urbanization process and the increase in energy mining demand, urban underground space construction, coal mine site expansion, and underground resource development are constantly developing. Geological drilling, hydrological well drilling, geothermal drilling, engineering survey drilling, and oil drilling all require drilling to obtain effective and reliable geological information about unknown underground conditions. The effective acquisition of geological information often depends on the quality of the borehole, and the depth of the borehole is an important indicator. In the study of borehole depth monitoring during coring, domestic scholars Sun Zhifei and others determined the number of drill rods by manual or instrument counting to obtain the borehole depth. The measurement principle is L = NH (L is the total length of the drill rod, N is the number of drill rods, and H is the length of a single drill rod); foreign scholars Tello and others used the form of waves (sound waves, low-voltage pulses, electromagnetic waves) to monitor and calculate the depth of the borehole during engineering construction. Based on the wave propagation speed v, the sensor receives the reflected signal and determines the time difference t between the emitted and reflected signals. From L = vt / 2, the length of the drill rod column L is obtained, and finally the borehole depth is accumulated. However, in the above studies, the monitoring and management of drilling construction quality and hole depth gradually showed many shortcomings: 1) Manual or instrument counting methods are greatly affected by human factors, the reliability of geotechnical engineering survey data is reduced, and the quality of survey results is difficult to guarantee; 2) The hole depth of the drilling process is monitored in the form of waves (sound waves, low-voltage pulses, electromagnetic waves, etc.), but the waves are affected by factors such as the connection between drill rods, rod thickness, and formation media during transmission, and the signal transmission has defects such as reflection and attenuation during transmission. Summary of the invention

[0003] The purpose of the present invention is to provide an effective hole depth calculation method based on displacement and oil pressure monitoring values ​​to solve the problem of inaccurate hole depth calculation caused by artificial influence and attenuation of wave transmission process in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides an effective hole depth calculation method based on displacement and oil pressure monitoring values, comprising:

[0005] Obtaining the working parameters of the drilling rig, and drawing a change schematic diagram based on the working parameters; wherein the change schematic diagram includes: a soil layer change schematic diagram and a rock layer change schematic diagram;

[0006] Based on the change schematic diagram, an effective interval of the drilling rig is obtained; wherein the effective interval includes: an effective interval of a soil layer and an effective interval of a rock layer;

[0007] Based on the laser displacement sensor and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the laser displacement sensor and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth.

[0008] Preferably, the process of obtaining the working parameters of the drilling rig includes:

[0009] A drilling rig construction record sheet is obtained, and based on the drilling rig construction record sheet, core sample characteristics after coring while drilling are obtained, and based on the core sample characteristics, working parameters for drilling into soil layers and working parameters for drilling into rock layers are obtained respectively, and the working parameters include: displacement data and oil pressure monitoring data.

[0010] Preferably, the process of drawing the change schematic diagram includes:

[0011] With time as the horizontal axis and displacement data and oil pressure monitoring data as the vertical axis, the working parameter data of the on-site drilling rig when drilling into the soil layer and rock layer are respectively used to draw a schematic diagram of the soil layer change and a schematic diagram of the rock layer change.

[0012] Preferably, the process of obtaining the effective interval of the drilling rig includes:

[0013] According to a method for determining an effective drilling interval based on an oil pressure threshold, based on the change diagram, the effective interval of the soil layer of the drilling rig is obtained by obtaining the range of the oil pressure average value and the first sudden change rate of the oil pressure.

[0014] Preferably, the process of obtaining the total monitored displacement of the soil layer includes:

[0015] Obtain soil layer displacement data through a laser displacement sensor, obtain a single effective interval of the soil layer effective interval, and obtain a plurality of effective segments based on the single effective interval and the soil layer displacement data;

[0016] Based on the effective section, the maximum value and the minimum value of the soil layer displacement are obtained, the displacement difference between the maximum value and the minimum value of the soil layer displacement is calculated, the displacement difference is accumulated to obtain the monitoring displacement of a single effective interval, and the monitoring displacement of a single effective interval is accumulated to obtain the total monitoring displacement of the soil layer.

[0017] Preferably, the process of obtaining the total monitoring displacement of the rock formation includes:

[0018] Obtaining rock formation displacement data through a laser displacement sensor, obtaining a single effective interval of the rock formation effective interval, and obtaining a plurality of effective sections based on the single effective interval and the rock formation displacement data;

[0019] Based on the effective section, the maximum and minimum rock formation displacements are obtained, the displacement difference between the maximum and minimum rock formation displacements is calculated, the displacement difference is accumulated to obtain the monitoring displacement of a single effective interval, and the monitoring displacements of a single effective interval are accumulated to obtain the total monitoring displacement of the rock formation.

[0020] Preferably, the process of obtaining the total displacement includes:

[0021] The total monitored displacement of the soil layer and the total monitored displacement of the rock layer are combined and added to obtain a total displacement, wherein the total displacement is the effective hole depth.

[0022] The technical effects of the present invention are:

[0023] The present invention obtains the effective interval of the drilling rig through the working parameters of the drilling rig; wherein the effective interval includes: the effective interval of the soil layer and the effective interval of the rock layer; based on the laser displacement sensor and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the laser displacement sensor and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth.

[0024] The present invention relies on monitoring the working parameters of the drilling rig during the drilling process to display the drilling footage of the drilling rig in real time and calculate the effective drilling depth, thereby reducing the human influence of manual or instrument counting methods and improving work efficiency. The present invention uses a laser displacement sensor as a displacement measurement medium, which is less affected by the outside world during signal transmission, and can quickly and easily calculate the drilling depth of the borehole in different time periods. In combination with real-time transmission equipment, the purpose of remote monitoring can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 A graph showing the variation of displacement and oil pressure data over time when drilling into a soil layer in an embodiment of the present invention;

[0027] Figure 2 A graph showing the displacement and oil pressure data changing over time when drilling into a rock formation in an embodiment of the present invention;

[0028] Figure 3 It is an enlarged diagram of displacement and oil pressure data changing with time when drilling into a soil layer in an embodiment of the present invention;

[0029] Figure 4 It is an enlarged diagram of displacement and oil pressure data changing with time when drilling into a rock formation in an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the flow chart of the calculation formula of the drilling depth when drilling into the soil layer in the embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of the flow chart of the calculation formula of the drilling depth when drilling into the rock formation in the embodiment of the present invention;

[0032] Figure 7 4 is a flow chart of a method in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] Embodiment 1

[0036] like Figure 7 As shown, in this embodiment, a method for calculating an effective hole depth based on displacement and oil pressure monitoring values ​​is provided, including: obtaining working parameters of a drilling rig, drawing a change diagram based on the working parameters, and obtaining an effective interval of the drilling rig based on the change diagram; wherein the effective interval includes: an effective interval of a soil layer and an effective interval of a rock layer;

[0037] Based on the laser displacement sensor and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the laser displacement sensor and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth.

[0038] In this embodiment, the effective interval of the soil layer is the effective interval of the drilling rig working parameters (laser displacement and oil pressure data) when the drilling rig drills into the soil layer; the total monitoring displacement of the soil layer is the total monitoring displacement of the laser displacement sensor when the drilling rig drills into the soil layer;

[0039] The effective interval of the rock formation is the effective interval of the drilling rig working parameters (laser displacement and oil pressure data) when the drilling rig drills into the rock formation; the total monitoring displacement of the rock formation is the total monitoring displacement of the laser displacement sensor when the drilling rig drills into the rock formation.

[0040] Specific implementations include:

[0041] 1) During the first drilling (ZK1), the effective drilling intervals b (b1, b2, ..., b k ).

[0042] 2) According to the drilling start and end time recorded in the hole construction record table of the first drilling (ZK1), determine the n valid intervals b1-b during the drilling process of the drilling rig n According to the physical and mechanical properties (color, hardness, compressibility, etc.) of the core sample obtained from the borehole, that is, the characteristics of the core sample obtained, it is judged that the drilling rig is in the effective range b1-b n The stratum drilled into is a rock stratum or a soil stratum. The k effective intervals are divided into two groups, namely, 土 Group B 岩 With time as the horizontal axis and oil pressure and displacement as the vertical axis, the working parameter data of the on-site drilling rig when drilling into the soil layer and rock layer are plotted into a graph of displacement and oil pressure monitoring data during the drilling process versus time, such as Figure 1-Figure 2 shown.

[0043] 3) According to a method for determining the effective drilling interval based on the oil pressure threshold, based on the time record of the first drilling and the displacement and oil pressure monitoring data of the drilling process over time, the two oil pressure thresholds of the kth (k=1,2,...,m) effective drilling interval during the first drilling in the study area are obtained. The two oil pressure thresholds include: the oil pressure average value and the oil pressure first mutation change rate (within 5s). The data is summarized to obtain a reasonable threshold range for the study area, that is, the range of the oil pressure average value (minimum to maximum value) and the minimum value of the oil pressure first mutation change rate. The range of the oil pressure average value and the oil pressure first mutation change rate (within 5s) when drilling in the soil layer and the rock layer is determined respectively, recorded as P 1土 , P 2土 , P 1岩 , P 2岩 The effective drilling range during drilling construction is determined by obtaining the range of the average oil pressure value and the first sudden change rate of the oil pressure (within 5 seconds).

[0044] When drilling is needed again in the same study area, by comparing the oil pressure monitoring data of the on-site drilling process, the corresponding effective drilling time interval (the average oil pressure is within this range and the first sudden change rate of oil pressure is greater than the minimum value) of other drilling construction in the same study area can be quickly and accurately found.

[0045] 4) Obtain displacement data through a laser displacement sensor, and divide m effective intervals based on the displacement data and the process of determining the effective interval of the drilling rig. Each time a displacement drop segment is identified in an effective interval j (j = 1, 2, ..., m), it is recorded as an effective segment i, and the maximum displacement H in the segment is calculated. imax With the minimum displacement H imin By accumulating the displacement differences of n effective segments in effective interval j, the monitoring displacement l of effective interval j is obtained. j, as shown in formula 1. The displacement and oil pressure data change over time as shown in the enlarged diagram Figure 3-Figure 4 The monitoring displacement of each effective interval is accumulated to obtain the total monitoring displacement of the soil layer. The calculation method of the total monitoring displacement of the rock layer is consistent with that of the soil layer.

[0046]

[0047] 5) The total displacement l of the two groups of effective intervals j Accumulate them to get L 土 and L 岩 The formula flow chart of the drilling depth when drilling into the soil layer is as follows: Figure 5 As shown in the figure, the formula flow diagram of the drilling depth when drilling into the rock formation is as follows Figure 6 As shown. We can get L 土 =29.63m, L 岩 =4.80m. 土 With L 岩 The total displacement L can be obtained by combining (土+岩) , that is, the borehole depth L of m effective intervals. Substituting the borehole depth when drilling in soil or rock into formula 2 yields: L 总 =34.43m.

[0048]

[0049] l k (k=1,2,…,m) is the monitoring displacement of a single effective drilling interval in the total m effective drilling intervals of the soil layer and the rock layer during the drilling process (assuming that there are w effective drilling periods when drilling the soil layer and mw effective drilling periods for the rock layer). The actual hole depth can be obtained by summing them up.

[0050] Beneficial effects of this embodiment:

[0051] This embodiment relies on the monitoring of the drilling rig's working parameters during the drilling process to realize real-time display of the drilling rig's footage length and calculate the effective drilling depth, thereby reducing the human influence of manual or instrument counting methods and improving work efficiency. This embodiment uses a laser displacement sensor as a displacement measurement medium, and the signal is less affected by the outside world during transmission. The drilling depth of the borehole in different time periods can be calculated quickly and simply, and the purpose of remote monitoring can be achieved in conjunction with real-time transmission and other equipment.

[0052] 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 calculating effective hole depth based on displacement and oil pressure monitoring values, characterized in that: The following steps are involved: Obtaining working parameters of the drilling rig, and drawing a change diagram based on the working parameters; The change schematic diagram includes: a soil layer change schematic diagram and a rock layer change schematic diagram; The process of obtaining the working parameters of the drilling rig includes: Obtaining a drilling rig construction record sheet, obtaining core sample characteristics after coring while drilling based on the drilling rig construction record sheet, and obtaining working parameters for drilling into soil layers and working parameters for drilling into rock layers based on the core sample characteristics, respectively, wherein the working parameters include displacement data and oil pressure monitoring data; The process of drawing a change diagram includes: With time as the horizontal axis and displacement data and oil pressure monitoring data as the vertical axis, the working parameter data of the on-site drilling rig when drilling into the soil layer and rock layer are plotted into a soil layer change schematic diagram and a rock layer change schematic diagram respectively; Based on the change schematic diagram, an effective interval of the drilling rig is obtained; wherein the effective interval includes: an effective interval of a soil layer and an effective interval of a rock layer; The process of obtaining the effective interval of the drilling rig includes: Based on the change diagram, the effective range of the drilling rig is obtained by respectively obtaining the average value of the oil pressure and the range of the first sudden change rate of the oil pressure when drilling in the soil layer and the rock layer; Based on the laser displacement sensor and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the laser displacement sensor and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth.

2. The effective hole depth calculation method based on displacement and oil pressure monitoring values ​​according to claim 1 is characterized in that: The process of obtaining the total monitoring displacement of the soil layer includes: Obtain soil layer displacement data through a laser displacement sensor, obtain a single effective interval of the soil layer effective interval, and obtain a plurality of effective segments based on the single effective interval and the soil layer displacement data; Based on the effective section, the maximum value and the minimum value of the soil layer displacement are obtained, the displacement difference between the maximum value and the minimum value of the soil layer displacement is calculated, the displacement difference is accumulated to obtain the monitoring displacement of a single effective interval, and the monitoring displacement of a single effective interval is accumulated to obtain the total monitoring displacement of the soil layer.

3. The effective hole depth calculation method based on displacement and oil pressure monitoring values ​​according to claim 1 is characterized in that: The process of obtaining the total monitoring displacement of the rock formation includes: Obtaining rock formation displacement data through a laser displacement sensor, obtaining a single effective interval of the rock formation effective interval, and obtaining a plurality of effective sections based on the single effective interval and the rock formation displacement data; Based on the effective section, the maximum and minimum rock formation displacements are obtained, the displacement difference between the maximum and minimum rock formation displacements is calculated, the displacement difference is accumulated to obtain the monitoring displacement of a single effective interval, and the monitoring displacements of a single effective interval are accumulated to obtain the total monitoring displacement of the rock formation.

4. The effective hole depth calculation method based on displacement and oil pressure monitoring values ​​according to claim 1 is characterized in that: The process of obtaining the total displacement includes: The total monitored displacement of the soil layer and the total monitored displacement of the rock layer are combined and added to obtain a total displacement, wherein the total displacement is the effective hole depth.

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