A method, device and apparatus for sampling drilling cuttings

Abstract

The present application relates to the field of oil and gas industry exploration and development, and particularly relates to a drilling rock sample method, device and equipment. The method comprises the following steps: obtaining the space size from the drilling start position to the sampling position as a first space, and obtaining a plurality of drilling fluid flow rates, a plurality of annular increments and a plurality of drilling times corresponding to a plurality of time points during drilling; calculating the time of rock reaching the sampling position corresponding to each time point as a sampling reference time according to the first space and the drilling fluid flow rate, the annular increment and the drilling time corresponding to each time point; determining a plurality of sampling times according to the sampling reference time corresponding to each time point and a predetermined sampling period; and sampling the rock according to the plurality of sampling times. Through the method, the time of rock reaching the sampling port generated by the drilling bit at a plurality of time points during drilling is accurately calculated, and the rock is sampled according to the time of rock reaching the sampling port.

Description

Technical Field

[0001] This article relates to the field of oil and gas exploration and development, and in particular to a method, apparatus and equipment for drilling cuttings sampling. Background Technology

[0002] Drilling is a costly, high-risk, and technology-intensive engineering operation, and a crucial step in the oil and gas industry for drilling formations, discovering oil and gas shows, and establishing oil and gas production capacity. Geological data plays a critical role in the drilling process. The acquisition of geological data, known as "well logging," provides geological references for drilling operations, including collecting, recording, and analyzing engineering parameters such as drilling time, drilling pressure, and suspended weight, as well as geological parameters such as core samples, cuttings, drilling fluid density, conductivity, and temperature. It is often referred to as the "eyes" of the drilling operation. While the acquisition and analysis of major logging parameters are largely automated, cuttings acquisition requires high-quality sampling, must be timely and matched to drilling conditions, and requires further analysis and judgment beyond sampling, such as cuttings description.

[0003] During drilling, the drill bit cuts rocks and other materials from the formation into cuttings, injecting drilling fluid into the wellbore. The drilling fluid, carrying the cuttings, enters the overflow pipe through the annulus. A filter in the overflow pipe filters out the cuttings, which are then sent to a cuttings container and transported outside the well. The filtered drilling fluid is then reintroduced into the wellbore for reuse. To analyze the formation using the cuttings, a cuttings sampling port is typically installed in the overflow pipe. A portion of the sampled cuttings is fed into a processing unit for drying and other subsequent treatments, facilitating analysis of the dried cuttings. Current cuttings sampling methods involve manually controlling the opening and closing of the sampling port to collect cuttings from the overflow pipe. However, due to variations in downhole drilling speed and drilling fluid pumping rate into the overflow pipe, manual sampling can only be completed in one go. Manual sampling is highly subjective, and it's difficult to accurately retrieve cuttings in the face of complex downhole conditions and rough estimations of cuttings return time. Consequently, the accuracy of using these cuttings for formation analysis is low. Therefore, it is necessary to develop cuttings sampling devices and supporting systems that precisely determine sampling time and integrate with automated continuous mechanical sampling to ensure that each meter of cuttings more accurately represents the underground rock formations.

[0004] There is an urgent need for a drilling cuttings sampling method to solve the problems of existing technologies that can only collect all the cuttings at once, manual sampling is highly subjective, and it is difficult to accurately retrieve cuttings in the face of complex downhole conditions and rough estimation of cuttings return time. As a result, the obtained cuttings are not uniformly distributed in the formation, and the accuracy of formation analysis using these cuttings is low. Summary of the Invention

[0005] To address the problems in the prior art, this embodiment provides a drilling cuttings sampling method, apparatus, and equipment. This method enables precise calculation of the arrival time of drilling cuttings at the sampling port at multiple time points during drilling, allowing sampling based on these arrival times. This achieves uniform sampling of cuttings from different depths within the formation, avoiding the complete removal of all cuttings at once. The cuttings obtained using this method better reflect the actual formation conditions, thereby improving the accuracy of formation analysis using these cuttings.

[0006] To solve the above-mentioned technical problems, the specific technical solution presented in this paper is as follows: On the one hand, the embodiments of this article provide a method for drilling cuttings sampling, including, The space between the drilling start point and the sampling point is obtained as the first space, and multiple drilling fluid flow rates, multiple annular increments and multiple drilling times are obtained at multiple time points during the drilling process; Based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, calculate the time when the cuttings arrive at the sampling location at each time point, and use it as the sampling reference time. Multiple sampling times are determined based on the sampling reference time corresponding to each time point and the predetermined sampling cycle; The rock fragments were sampled according to multiple sampling times.

[0007] Furthermore, after determining the sampling reference time, the method further includes: Establish the correspondence between the sampling reference time corresponding to each time point and the incremental drilling progress of the drill bit corresponding to that time point; Multiple sampling times are determined based on the correspondence and the predetermined sampling period.

[0008] Furthermore, the predetermined sampling period includes a predetermined sampling depth; Determining multiple sampling times based on the aforementioned correspondence and the predetermined sampling period further includes: Based on the predetermined sampling depth and the corresponding relationship, a plurality of sampling reference times corresponding to the predetermined sampling depth are determined; The sampling time is selected from a plurality of determined sampling reference times according to a predetermined sampling time step.

[0009] Furthermore, the sampling location is inside the overflow prevention pipe, which is connected to the wellbore; The wellbore includes a drill pipe and a drill bit fixed to one end of the drill pipe, and the drill bit drills along the axial direction of the wellbore; The annular increment includes the increment of the wellbore annulus after the drill bit has entered the wellbore between this time point and the previous time point adjacent to it. The wellbore annulus represents the annular region formed by the drill pipe and the inner wall of the wellbore. The drilling fluid carries the rock cuttings back from the wellbore into the overflow pipe.

[0010] Furthermore, the calculation formula for the first space is:

[0011] in, This refers to the first space. This indicates the annulus in the wellbore corresponding to the drilling start position. This refers to the volume of the overflow pipe from the wellhead to the sampling location inside the overflow pipe.

[0012] Furthermore, the formula for calculating the time it takes for the cuttings to reach the sampling location at each time point, based on the first space and the drilling fluid flow rate, annular increment, and drilling time corresponding to each time point, is as follows:

[0013] in, This indicates the time when the rock cuttings arrived at the sampling location corresponding to the first time point. This refers to the first space. This represents the annular increment corresponding to the first time point. This represents the drilling fluid flow rate corresponding to the first time point. This indicates the drilling time corresponding to the first time point. Indicates the first i The time point corresponding to the arrival time of the rock cuttings at the sampling point. Indicates the first i The corresponding annular increment at each time point Indicates the first i Drilling fluid flow rate at each time point Indicates the first i Drilling time corresponding to each time point.

[0014] Furthermore, after determining multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period, the method further includes, The amount of cuttings to be sampled at each sampling time is determined based on the predetermined cuttings sampling capacity and the drilling fluid flow rate corresponding to each sampling time. The rock fragments are sampled according to the sampling time and the corresponding amount of rock fragments sampled.

[0015] On the other hand, this embodiment also provides a drilling cuttings sampling device, including: The data acquisition unit is used to acquire the spatial size from the drilling start position to the sampling point as the first space, and to acquire multiple drilling fluid flow rates, multiple annular increments and multiple drilling times corresponding to multiple time points during the drilling process; The sampling reference time calculation unit is used to calculate the time when the cuttings arrive at the sampling point at each time point based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, and use it as the sampling reference time. The sampling time determination unit is used to determine multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period. A sampling control unit is used to sample the rock cuttings according to multiple sampling times.

[0016] On the other hand, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the above-described method.

[0017] On the other hand, embodiments of the present invention also provide a computer storage medium storing a computer program thereon, which executes the above-described method when run by the processor of a computer device.

[0018] Using the embodiments described herein, the time it takes for the cuttings generated by the drill bit to reach the sampling position with the drilling fluid is first calculated based on the spatial size from the pre-drilling start position to the sampling position, the drilling fluid flow rate at each time point during drilling, the annular increment, and the drilling time. Then, using this time as a reference, multiple sampling times are determined according to a predetermined sampling cycle. Finally, the cuttings are sampled according to the multiple sampling times. This method calculates the sampling time for the cuttings generated at each time point of the drill bit's drilling, uniformly sampling cuttings at different depths in the formation, avoiding the complete collection of cuttings at once. The cuttings obtained by the method described in this embodiment can better reflect the actual situation of the formation, thereby improving the accuracy of formation analysis using these cuttings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or prior art described herein, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this article. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an implementation system for a drilling cuttings sampling method according to an embodiment of the present invention; Figure 2 The diagram shown is a flowchart of a drilling cuttings sampling method according to an embodiment of this paper. Figure 3 The figure shows the steps in this embodiment to determine the drilling depth and the sampling time of the generated cuttings based on the sampling reference time; Figure 4 The diagram illustrates the steps for determining multiple sampling times based on the correspondence and the predetermined sampling period in this embodiment. Figure 5 The figure shows the steps for calculating the amount of rock debris sampled in the embodiments of this article; Figure 6 The diagram shown is a schematic diagram of a drilling cuttings sampling device according to an embodiment of this article; Figure 7 The diagram shown is a structural schematic of the computer device in the embodiment of this article; Figure 8 The diagram shown is a structural schematic of the sampling bucket in the embodiment of this article.

[0021] [Explanation of Figure Markers]: 1. Strata; 101. Shaft; 102. Overflow prevention pipe; 103. Sampling location; 104. Rock cuttings bucket; 105. Drill pipe; 106. Drill bit; 107. Wellbore annulus; 108. Drilling fluid; 109. Recycling device; 601. Data Acquisition Unit; 602. Sampling reference time calculation unit; 603. Sampling Time Determination Unit; 604. Sampling control unit; 702. Computer equipment; 704. Processing equipment; 706. Storage resources; 708. Drive mechanism; 710. Input / Output Module; 712. Input devices; 714. Output devices; 716. Presentation equipment; 718. Graphical User Interface; 720. Network interface; 722. Communication link; 724. Communication bus; 801. Baffle; 802. Screen. Detailed Implementation

[0022] The technical solutions in the embodiments described below will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments described herein, and not all of the embodiments. Based on the embodiments described herein, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this document.

[0023] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings herein are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0024] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this application all comply with the relevant provisions of national laws and regulations.

[0025] like Figure 1 The diagram shows a schematic of an implementation system for a drilling cuttings sampling method according to an embodiment of the present invention. The system includes a formation 1, a wellbore 101 within the formation 1, a drill pipe 105 and a drill bit 106 located at one end of the drill pipe 105 within the wellbore 101. The drill bit 106 drills into the formation 1, forming cuttings. Drilling fluid 108 is injected into the wellbore 101, carrying the cuttings upwards through the annulus 107 and flowing into the overflow pipe 102. The overflow pipe 102 has a sampling position 103. During sampling, the valve at the sampling position 103 is opened, and the cuttings are sampled into a cuttings container 104. After sampling, the valve at the sampling position 103 is closed, and the drilling fluid 108 flows into a recovery device 109 to filter out the waste cuttings and recover the drilling fluid 108.

[0026] In addition, it should be noted that, Figure 1 The example shown is merely one application environment provided by this disclosure. In practical applications, other application environments may also be included, and this specification does not impose any limitations.

[0027] Because the drilling speed and the rate at which drilling fluid is pumped into the overflow pipe are variable, it is difficult for humans to estimate the time it takes for the cuttings generated per meter of drilling to reach the sampling port. In current technology, cuttings can only be sampled by controlling the opening and closing of the sampling port manually. However, since it is impossible to estimate the time it takes for cuttings at a specific drilling depth to reach the sampling port, it is difficult to sample cuttings at a specific drilling depth. The cuttings samples obtained by manually controlling the opening and closing of the sampling port are not uniformly distributed according to the formation depth, so the accuracy of using these cuttings to analyze the formation is low.

[0028] To address the problems existing in the prior art, this embodiment provides a drilling cuttings sampling method. This method calculates the sampling time for the cuttings generated at each time point of the drill bit's drilling, and uniformly samples cuttings at different depths in the formation. Figure 2 The diagram illustrates a drilling cuttings sampling method according to an embodiment of this paper. While the process of sampling drilling cuttings is described in this diagram, it can include more or fewer steps based on conventional or non-creative labor. The order of steps listed in the embodiment is merely one possible execution order among many and does not represent the only possible order. In actual system or device products, the methods shown in the embodiment or the accompanying drawings can be executed sequentially or in parallel. Specifically, as shown... Figure 2 As shown, the method, which can be executed by a processor, may include: Step 201: Obtain the spatial size from the drilling start position to the sampling position as the first space, and obtain multiple drilling fluid flow rates, multiple annular increments, and multiple drilling times at multiple time points during the drilling process; Step 202: Calculate the time when the cuttings arrive at the sampling location at each time point based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, and use it as the sampling reference time; Step 203: Determine multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period; Step 204: Sample the rock fragments according to multiple sampling times.

[0029] Using the embodiments described herein, the time it takes for the cuttings generated by the drill bit to reach the sampling position with the drilling fluid is first calculated based on the spatial size from the pre-drilling start position to the sampling position, the drilling fluid flow rate at each time point during drilling, the annular increment, and the drilling time. Then, using this time as a reference, multiple sampling times are determined according to a predetermined sampling cycle. Finally, the cuttings are sampled according to the multiple sampling times. This method calculates the sampling time for the cuttings generated at each time point of the drill bit's drilling, uniformly sampling cuttings at different depths in the formation, avoiding the complete collection of cuttings at once. The cuttings obtained by the method described in this embodiment can better reflect the actual situation of the formation, thereby improving the accuracy of formation analysis using these cuttings.

[0030] In this embodiment, the sampling location is inside the overflow preventer pipe, which is connected to the wellbore. The wellbore includes a drill pipe and a drill bit fixed to one end of the drill pipe. The drill bit drills along the axial direction of the wellbore. The annular increment includes the increment of the wellbore annulus between this time point and the adjacent previous time point after the drill bit has drilled. The wellbore annulus represents the annular area formed by the drill pipe and the inner wall of the wellbore. The drilling fluid carries the rock cuttings back from the wellbore to the overflow preventer pipe.

[0031] In the embodiments described herein, such as Figure 1 As shown, the first space includes the wellbore annulus corresponding to the distance from the drill bit to the overflow pipe, and the sum of the overflow pipe volumes corresponding to the distance from the junction of the overflow pipe and the wellbore to the sampling position. During the drilling process, the drill bit breaks up rocks and other materials in the formation to form cuttings. At the same time, drilling fluid is injected into the wellbore from the surface. After the drilling fluid reaches the drill bit position, it carries the formed cuttings back up from the wellbore annulus and flows into the overflow pipe. The cuttings in the drilling fluid are obtained at the sampling position in the overflow pipe. After filtering and other operations, the cuttings enter the cuttings bucket. The staff can analyze the cuttings in the cuttings bucket and calculate formation data.

[0032] During drilling, the generated cuttings need to pass through a first space to reach the sampling location. The time required for the cuttings to reach the sampling location is related to the drilling fluid flow rate and the size of the first space. Furthermore, as the drill bit penetrates deeper, the size of the first space gradually increases, with the increase being the annular increment. In this embodiment, drilling time represents the drilling speed, but unlike drilling speed, drilling time represents the time required to drill one meter. Multiple drilling fluid flow rates, annular increments, and drilling times are obtained at multiple time points during the drilling process. Each time point corresponds to one drilling fluid flow rate, annular increment, and drilling time. Then, based on the first space and the corresponding drilling fluid flow rate, annular increment, and drilling time, the time for the cuttings to reach the sampling location at each time point is calculated as a sampling reference time. This sampling reference time represents the time it takes for the cuttings generated during each drilling time to reach the sampling location. Then, multiple sampling times are determined based on the sampling reference time corresponding to each time point and a predetermined sampling cycle. Finally, cuttings are sampled from the overflow pipe based on these multiple sampling times.

[0033] According to one embodiment of this article, in order to further determine the drilling depth and the sampling time of the generated cuttings based on the sampling reference time, such as... Figure 3 As shown, after determining the sampling reference time, the method further includes: Step 301: Establish the correspondence between the sampling reference time corresponding to each time point and the incremental drilling of the drill bit corresponding to that time point; Step 302: Determine multiple sampling times based on the correspondence and the predetermined sampling period.

[0034] In this embodiment, because the annular increment corresponding to each time point is obtained, the drilling depth of the drill bit can be determined based on the annular increment. Therefore, the drilling depth corresponding to each time point can be determined, thereby establishing a correspondence between the sampling reference time corresponding to each time point and the drill bit drilling increment corresponding to that time point. Then, multiple sampling times are determined based on the correspondence and a predetermined sampling period. In one embodiment of this embodiment, the predetermined sampling period includes a predetermined sampling depth, such as... Figure 4 As shown, determining multiple sampling times based on the correspondence and the predetermined sampling period further includes: Step 401: Determine multiple sampling reference times corresponding to the predetermined sampling depth based on the predetermined sampling depth and the corresponding relationship; Step 402: Select the sampling time from the determined plurality of sampling reference times according to the predetermined sampling time step.

[0035] In this embodiment, multiple sampling reference times corresponding to the predetermined sampling depth can be determined based on the predetermined sampling depth and the corresponding relationship. For example, the time for the rock cuttings generated by drilling 0.1 meters to reach the sampling position can be established based on the increment (meters) of the drill bit. If the predetermined sampling depth is 1 meter, the time for the rock cuttings generated by drilling 0.1 meters to reach the sampling position during the 1 meter process can be determined based on the predetermined sampling depth and the corresponding relationship. In this way, the time for the first rock cuttings generated to reach the sampling position and the time for the last rock cuttings generated to reach the sampling position during the 1 meter process can be calculated.

[0036] Finally, the sampling time is selected from multiple determined sampling reference times according to the predetermined sampling time step. For example, if the rock cuttings generated at the beginning of the 1-meter drilling reaches the sampling position at 10:05:10 and the rock cuttings generated at the end of the 1-meter drilling reaches the sampling position at 10:50:10, and if the predetermined sampling time step is to sample once every 5 minutes, then the sampling time can be determined to start from 10:05:10 and sample once every 5 minutes until the time reaches 10:50:10, so that the rock cuttings generated from the 1-meter drilling can be extracted evenly.

[0037] It should be noted that sampling can also be performed according to the reference sampling time, that is, multiple sampling times can be selected from multiple reference sampling times according to the sampling time step. This specification does not limit the embodiments.

[0038] According to one embodiment of this article, the calculation formula for the first space is (1): (1) in, This refers to the first space. This indicates the annulus in the wellbore corresponding to the drilling start position. This refers to the volume of the overflow pipe from the wellhead to the sampling location inside the overflow pipe.

[0039] According to one embodiment of this paper, the formula for calculating the time when the cuttings arrive at the sampling location at each time point based on the first space and the drilling fluid flow rate, annular increment, and drilling time corresponding to each time point is (2)-(3):

[0040] in, This indicates the time when the rock cuttings arrived at the sampling location corresponding to the first time point. This refers to the first space. This represents the annular increment corresponding to the first time point. This represents the drilling fluid flow rate corresponding to the first time point. This indicates the drilling time corresponding to the first time point. Indicates the first i The time point corresponding to the arrival time of the rock cuttings at the sampling point. Indicates the first i The corresponding annular increment at each time point Indicates the first i Drilling fluid flow rate at each time point Indicates the first i Drilling time corresponding to each time point.

[0041] This can be understood as follows: the cuttings at the first time point of drilling need to traverse the entire first space to reach the sampling position. The time for the cuttings at the first time point to reach the sampling position includes the time required for the cuttings at the first time point to flow through the entire first space with the drilling fluid at that time point, the time required for the cuttings at the first time point to flow through the annulus increment at that time point with the drilling fluid at that time point, and the drilling time at the first time point. The drilling time can be the time difference between the time difference between the initial and subsequent time points when the cuttings are broken and enter the drilling fluid system. Therefore, the drilling time at the first time point can be 0.

[0042] The cuttings generated at the second time point also need to follow the same path as the cuttings generated at the first time point to reach the sampling location. Therefore, the time for the cuttings generated at the second time point to reach the sampling location includes the time required for the cuttings generated at the first time point to reach the sampling location, the time required for the cuttings at the second time point to flow through the annulus increment corresponding to the drilling fluid at that time point, and the drilling time corresponding to the second time point. This process is repeated to calculate the time for the cuttings generated at each time point to reach the sampling location.

[0043] In practice, the time it takes for the rock cuttings generated after each meter of drilling to reach the sampling location can be calculated. Specifically, the number of time points during the first meter of drilling is set to 1. j There are 2 time points during the drilling process to the 2nd meter. j One, in drilling the first i The number of time points in the process of making rice is ij If there are 1, then the time it takes for the rock cuttings produced after drilling the first meter to reach the sampling location is (4):

[0044] in, This indicates the time it takes for the rock cuttings produced after drilling the first meter to reach the sampling location. This indicates the drilling fluid flow rate at the first time point during the drilling of the first meter. This represents the annular increment at the first time point during the drilling of the first meter. This indicates the drilling time corresponding to the first time point during the drilling process of the first meter. This indicates the process of drilling the first meter. j Drilling fluid flow rate at each time point This indicates the process of drilling the first meter. j The corresponding annular increment at each time point This indicates the process of drilling the first meter. j Drilling time corresponding to each time point.

[0045] Then drill into the first i The time it takes for the rock debris generated by the rice to reach the sampling location is (5):

[0046] in, Indicates drilling into the first i The time it takes for rock fragments generated by the sample to reach the sampling location. Indicates drilling into the first i The process of rice j Drilling fluid flow rate at each time point Indicates drilling into the first i The process of rice j The corresponding annular increment at each time point Indicates drilling into the first i The process of rice j Drilling time corresponding to each time point.

[0047] This determines the time it takes for the rock cuttings generated per meter of drilling to reach the sampling location. Then, based on the predetermined sampling depth and the time it takes for the rock cuttings generated per meter of drilling to reach the sampling location, the sampling time corresponding to this predetermined sampling depth can be determined.

[0048] In this embodiment, after the rock cuttings are taken from the sampling port, they pass through a filter device into a rock cuttings container. Because the capacity of the rock cuttings container is limited, if a large amount is sampled each time, multiple containers of rock cuttings may be obtained. Therefore, to facilitate subsequent analysis of the rock cuttings, it is necessary to control the amount of rock cuttings sampled each time to avoid collecting too much rock cuttings. Therefore, according to one embodiment of this paper, such as... Figure 5 As shown, after determining multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period, the method further includes, Step 501: Determine the amount of cuttings to be sampled for each sampling time based on the predetermined cuttings sampling capacity and the drilling fluid flow rate corresponding to each sampling time; Step 502: Sample the rock fragments according to the sampling time and the corresponding amount of rock fragments.

[0049] In this embodiment, the sampling cuttings capacity can be set according to actual needs. The sampling cuttings capacity corresponding to each sampling time is determined based on the sampling cuttings capacity and the drilling fluid flow rate corresponding to each sampling time, that is, the amount of cuttings sampled each time is determined. Then, the cuttings are sampled according to the sampling time and the corresponding amount of cuttings sampled, so as to ensure uniform sampling and avoid excessive amount of cuttings sampled.

[0050] In this embodiment, the sampling location can be a sampling port with an adjustable valve. The amount of cuttings sampled can be controlled by controlling the opening and closing degree of the valve. The opening and closing degree of the valve at each sampling time can be calculated based on the predetermined cuttings sampling capacity, the drilling fluid flow rate corresponding to each sampling time, and the size of the sampling port valve. After sampling is completed at the sampling time point, the valve is closed to pause sampling. After the next sampling time arrives, the valve is controlled to open according to the corresponding opening and closing degree to perform sampling.

[0051] In one embodiment of this document, the sampling bucket can be structured as follows: Figure 8 As shown, it includes multiple louvered baffles 801, a screen 802, and a barrel.

[0052] A louvered baffle 801 is located at the sampling position. The opening and closing degree of the baffle 801 can be controlled to control the amount of rock cuttings sampled. After the rock cuttings pass through the open baffle 801, they flow into the screen 802. The screen 802 filters out the drilling fluid in the rock cuttings, thus obtaining the final rock cuttings.

[0053] In some other embodiments described herein, the return of cuttings to the surface is not a one-time or instantaneous process, but is influenced by multiple factors. However, generally speaking, the drilling speed determines the amount of cuttings supplied to the drilled fractured formation and integrated into the drilling fluid system. δY The displacement of drilling fluid circulation δF The efficiency of cuttings return is determined by factors such as the drill string assembly and the corresponding annular volume used to reach the depth and above the well. δL This determines the time it takes for the pump to push the drilling fluid column containing cuttings upwards at a given instantaneous discharge rate. δ t Therefore, a discrete cuttings return curve can be constructed based on instantaneous data observed at a certain time point, with time as the horizontal axis and cuttings return volume as the vertical axis. For a certain well depth point... k unit time microelement δT:δYk=δROP k δTk≈δDk ,in δT This represents a microelement per unit of time. δDk This indicates the depth of penetration per unit time, which is the depth the drill bit penetrates within a specific unit of time.

[0054] Let a certain mark be K The time required for deep spot drilling is ROP k Then the required number of samples is ROP k / δTk ,here δTk The sampling interval can be 0.1 seconds or 0.2 seconds; assuming a single-meter upward return, the value of the drilling time micro-element is based on the sampling interval for each drilling time. δROP k Determine the opening of the sampling inlet. Let the starting time of sampling be [time point]. Tk 1. Sampling completion time is Tk 2. The number of drilling time recording points during the sampling period is 2. m =INT(( Tk 1- Tk 2) / δTk ), where INT is the rounding symbol. For the sampling timing, this case uses the moment when cuttings from a certain meter depth are first returned from the bottom of the well and reach the sampling point with the drilling fluid as the sampling start point. Since the equipment's sampling action is activated (when the equipment is powered on), the opening and closing of the sampling port is determined by calculating the flow rate, ensuring that the sampling quantity is uniformly planned according to the corresponding micro-drilling time parameters within a unit micro-element time point. Let there be a corresponding depth point of the well to be sampled. m For each drilling time recording point, then for the marked point... b depth point p The calculation method for the opening degree of each sampling node can be (6)-(7):

[0055] in, Indicates that it is marked as b Depth point p Opening degree of each sampling node Representing depth point b The p Drilling time per sampling point Refers to depth point b Drilling fluid discharge rate.

[0056] Based on the same inventive concept, this embodiment also provides a drilling cuttings sampling device, such as... Figure 6 As shown, it includes: The data acquisition unit 601 is used to acquire the spatial size from the drilling start position to the sampling point as the first space, and to acquire multiple drilling fluid flow rates, multiple annular increments and multiple drilling times corresponding to multiple time points during the drilling process; The sampling reference time calculation unit 602 is used to calculate the time when the cuttings arrive at the sampling point at each time point based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, and use it as the sampling reference time. The sampling time determination unit 603 is used to determine multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period. The sampling control unit 604 is used to sample the rock cuttings according to a plurality of the sampling times.

[0057] Since the principle of the above-mentioned device in solving the problem is similar to that of the above-mentioned method, the implementation of the above-mentioned device can refer to the implementation of the above-mentioned method, and the repeated parts will not be described again.

[0058] like Figure 7 The diagram illustrates the structure of a computer device according to an embodiment of the present invention. The apparatus in this invention can be the computer device described in this embodiment, executing the method of the present invention as described above. The computer device 702 may include one or more processing devices 704, such as one or more central processing units (CPUs), each of which can implement one or more hardware threads. The computer device 702 may also include any storage resource 806 for storing any kind of information, such as code, settings, data, etc. Non-limitingly, for example, the storage resource 706 may include any type of RAM, any type of ROM, flash memory, hard disk, optical disk, etc. More generally, any storage resource can use any technology to store information. Further, any storage resource can provide volatile or non-volatile retention of information. Further, any storage resource can represent a fixed or removable component of the computer device 702. In one case, when the processing device 704 executes associated instructions stored in any storage resource or combination of storage resources, the computer device 702 can perform any operation of the associated instructions. The computer device 702 also includes one or more drive mechanisms 708 for interacting with any storage resource, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0059] Computer device 702 may also include an input / output module 710 (I / O) for receiving various inputs (via input device 712) and providing various outputs (via output device 714). A specific output mechanism may include a presentation device 716 and an associated graphical user interface (GUI) 718. In other embodiments, the input / output module 710 (I / O), input device 712, and output device 714 may be omitted, and the device may function solely as a computer device within a network. Computer device 702 may also include one or more network interfaces 720 for exchanging data with other devices via one or more communication links 722. One or more communication buses 724 couple the components described above together.

[0060] Communication link 722 can be implemented in any way, such as via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, or any combination thereof. Communication link 722 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0061] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0062] This embodiment also provides a computer-readable instruction, wherein when a processor executes the instruction, the program therein causes the processor to perform the above-described method.

[0063] It should be understood that in the various embodiments of this document, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0064] It should also be understood that, in the embodiments herein, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0065] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0066] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0067] In the embodiments provided herein, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices, or units, or they may be electrical, mechanical, or other forms of connection.

[0068] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments described herein, depending on actual needs.

[0069] Furthermore, the functional units in the various embodiments of this document can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0070] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this paper, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this paper. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0071] This document uses specific embodiments to illustrate the principles and implementation methods of this document. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this document. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this document. Therefore, the content of this specification should not be construed as a limitation of this document.

Claims

1. A method for sampling drilling cuttings, characterized in that, include: The size of the space from the drilling start point to the sampling point is used as the first space, and multiple drilling fluid flow rates, multiple annular increments, and multiple drilling times are obtained at multiple time points during the drilling process. Based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, calculate the time when the cuttings arrive at the sampling location at each time point, and use it as the sampling reference time. Multiple sampling times are determined based on the sampling reference time corresponding to each time point and the predetermined sampling cycle; The rock fragments were sampled according to multiple sampling times; The formula for calculating the time it takes for cuttings to reach the sampling location at each time point, based on the first space and the drilling fluid flow rate, annular increment, and drilling time corresponding to each time point, is as follows: in, This indicates the time when the rock cuttings arrived at the sampling location corresponding to the first time point. This refers to the first space. This represents the annular increment corresponding to the first time point. This represents the drilling fluid flow rate corresponding to the first time point. This indicates the drilling time corresponding to the first time point. Indicates the first i The time point corresponding to the arrival time of the rock cuttings at the sampling point. Indicates the first i The corresponding annular increment at each time point Indicates the first i Drilling fluid flow rate at each time point Indicates the first i Drilling time corresponding to each time point.

2. The method according to claim 1, characterized in that, After determining the sampling reference time, the method further includes: Establish the correspondence between the sampling reference time corresponding to each time point and the incremental drilling progress of the drill bit corresponding to that time point; Multiple sampling times are determined based on the correspondence and the predetermined sampling period.

3. The method according to claim 2, characterized in that, The predetermined sampling period includes a predetermined sampling depth; Determining multiple sampling times based on the aforementioned correspondence and the predetermined sampling period further includes: Based on the predetermined sampling depth and the corresponding relationship, a plurality of sampling reference times corresponding to the predetermined sampling depth are determined; The sampling time is selected from a plurality of determined sampling reference times according to a predetermined sampling time step.

4. The method according to claim 1, characterized in that, The sampling location is inside the overflow prevention pipe, which is connected to the wellbore. The wellbore includes a drill pipe and a drill bit fixed to one end of the drill pipe, and the drill bit drills along the axial direction of the wellbore; The annular increment includes the increment of the wellbore annulus after the drill bit has entered between this time point and the previous time point adjacent to it. The wellbore annulus represents the annular region formed by the drill pipe and the inner wall of the wellbore. The drilling fluid carries the rock cuttings back from the wellbore into the overflow pipe.

5. The method according to claim 4, characterized in that, The calculation formula for the first space is: in, This refers to the first space. This indicates the annulus in the wellbore corresponding to the drilling start position. This refers to the volume of the overflow pipe from the wellhead to the sampling location inside the overflow pipe.

6. The method according to claim 1, characterized in that, After determining multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period, the method further includes, The amount of cuttings to be sampled at each sampling time is determined based on the predetermined cuttings sampling capacity and the drilling fluid flow rate corresponding to each sampling time. The rock fragments are sampled according to the sampling time and the corresponding amount of rock fragments sampled.

7. A drilling cuttings sampling device, characterized in that, include: The data acquisition unit is used to acquire the spatial size from the drilling start position to the sampling point as the first space, and to acquire multiple drilling fluid flow rates, multiple annular increments and multiple drilling times at multiple time points during the drilling process. The sampling reference time calculation unit is used to calculate the time when the cuttings arrive at the sampling point at each time point based on the first space and the drilling fluid flow rate, annular increment and drilling time corresponding to each time point, and use it as the sampling reference time. The sampling time determination unit is used to determine multiple sampling times based on the sampling reference time corresponding to each time point and the predetermined sampling period. A sampling control unit is used to sample the rock cuttings according to multiple sampling times; The formula for calculating the time it takes for cuttings to reach the sampling location at each time point, based on the first space and the drilling fluid flow rate, annular increment, and drilling time corresponding to each time point, is as follows: in, This indicates the time when the rock cuttings arrived at the sampling location corresponding to the first time point. This refers to the first space. This represents the annular increment corresponding to the first time point. This represents the drilling fluid flow rate corresponding to the first time point. This indicates the drilling time corresponding to the first time point. Indicates the first i The time point corresponding to the arrival time of the rock cuttings at the sampling point. Indicates the first i The corresponding annular increment at each time point Indicates the first i Drilling fluid flow rate at each time point Indicates the first i Drilling time corresponding to each time point.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 6.

9. A computer storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor of the computer device, it performs the method according to any one of claims 1 to 6.

Images