CO2 true and false display gas logging identification method, system and equipment

Abstract

The invention belongs to the field of petroleum and natural gas engineering, and particularly relates to a CO2 true and false display gas logging identification method, system and equipment. The method aims at solving the problems that in the prior art, an abnormal CO2 source cannot be distinguished according to whether a CO2 single peak exists or not, and a drilling fluid adjusting basis cannot be provided for a drilling construction party. The method comprises the steps that the drilling state is obtained; acquiring a CO2 measurement value; a CO2 abnormal well section is obtained; obtaining peak appearance time; according to the peak appearance time, through a pre-constructed single-root peak judgment method, judging whether a single-root peak exists or not; and judging whether false display exists based on the single root peak. According to the method, the problem of true and false identification of CO2 multi-source generation in the drilling process is well solved, a drilling fluid adjustment basis is provided for a drilling construction party, and a valuable CO2 gas reservoir is found for a construction party.

Description

Background Art

[0001] CO2 gas is often detected during the gas logging process in the B depression. The duration is long and the content can reach up to 100%. As an acidic gas, CO2 will change the performance of drilling fluid if the content in drilling fluid is too high. It will also corrode drilling tools and be detrimental to drilling engineering. However, CO2 is a non-hydrocarbon gas with a wide range of uses. Finding CO2 gas reservoirs with industrial value is also one of the goals of oil and gas exploration. Through the analysis of a large amount of CO2-containing logging data, it is found that the detected CO2 does not all come from the formation. About two-thirds of it comes from drilling fluid additives. For example, FCLS (ferrochromium lignin sulfonate) is a commonly used viscosity reducing diluent for drilling fluid. It is made by adding ferrous sulfate and sodium dichromate to papermaking waste liquid after fermentation and concentration, and then spray drying. The main component is C, which can generate CO2 when fermented at high temperature in the well. Another example is starch derivatives, which are commonly used fluid loss reducers for drilling fluids. They are easily degraded by bacteria to produce CO2. Commonly used low-fluorescence liquid lubricants also produce CO2 at high temperatures in the well. With the advancement of drilling technology, the mechanical drilling speed is getting faster and faster, and new drilling fluid needs to be continuously prepared and added to the wellbore, which will correspondingly produce false CO2 displays.

[0002] Since CO2 is generated from multiple sources, there are both true displays of the formation and false anomalies caused by chemical reactions of drilling fluid additives. Therefore, after detecting CO2, it is necessary to distinguish its authenticity, eliminate the false and retain the true, and objectively evaluate the gas content of the formation. The logging response characteristics of CO2 gas are similar to those of total hydrocarbons, such as high and low display values, curve shape, aftereffect, single peak, etc.

[0003] Based on this, the present invention proposes a CO2 true and false display gas measurement identification method, system and equipment. Summary of the invention

[0004] In order to solve the above-mentioned problems in the prior art, namely, the prior art is unable to identify the source of CO2 anomalies by the presence or absence of a single CO2 peak, and is unable to provide a basis for drilling fluid adjustment for the drilling construction party, the present invention provides a CO2 true and false display gas testing identification method, system and equipment.

[0005] In one aspect of the present invention, a method for identifying true and false CO2 gas measurement is provided, the method comprising the following steps:

[0006] Step S10, during the drilling process, obtaining a well logging diagram; extracting the characteristics of the drilling parameters from the well logging diagram, and then obtaining the drilling status;

[0007] Step S20, when it is monitored that the drilling state is after connecting the column or the pole and drilling is being performed again, the CO2 content in the wellbore is detected by a gas monitor to obtain a CO2 measurement value;

[0008] Step S30, obtaining a base value of CO2 content; based on the base value and the CO2 measurement value, obtaining a CO2 abnormal well section;

[0009] Step S40, after obtaining the CO2 abnormal well section, when a CO2 non-abnormal well section appears, obtain the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum, as the first time; calculate the difference between the first time and the start time of obtaining the CO2 measurement value again, as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value;

[0010] Step S50, judging whether there is a single peak according to the peak time by using a pre-constructed single peak judgment method;

[0011] If yes, jump to step S60; if no, take the CO2 abnormal section as the CO2 false display section, jump to step S10, and re-perform CO2 true and false display identification until the drilling is completed;

[0012] Step S60, taking the well section with CO2 anomaly before the first CO2 single peak appears as the CO2 true display well section, and jumping to step S10 to re-perform CO2 true and false display identification until the drilling is completed.

[0013] In some preferred embodiments, the characteristics of drilling parameters extracted from the well logging diagram include: well depth, drilling pressure, hook load, drill speed, standpipe pressure, pump stroke, outlet density, outlet conductivity, outlet temperature, and CO2 measurement value.

[0014] In some preferred embodiments, when the drilling pressure, the hook load, the drill head speed, the standpipe pressure, the pump stroke, the outlet density, and the outlet conductivity are all zero, the outlet temperature is the set temperature, and the CO2 measurement value is zero, the drilling state is connecting the column or the pole.

[0015] In some preferred embodiments, the CO2 abnormal well section and the CO2 non-abnormal well section are obtained by:

[0016] The well section where the CO2 measurement value is greater than the set multiple of the base value is judged as the CO2 abnormal well section; if so, it is the CO2 abnormal well section, otherwise it is the CO2 non-abnormal well section.

[0017] In some preferred embodiments, a pre-constructed single peak determination method is used to determine whether a single peak exists, and the method is as follows:

[0018] When the peak time corresponding to each CO2 non-abnormal well section is less than or equal to the late time, and the first peak time is equal to the late time, a first measurement value is obtained by combining the maximum CO2 measurement value corresponding to the CO2 non-abnormal well section and the increase in well depth, and a single peak is obtained by judging based on the first measurement value and the first preset time;

[0019] The delayed time is the time it takes for the gas to be released from the bottom of the well to the ground and then be sent to the gas detection instrument for detection.

[0020] In some preferred embodiments, the first measurement value is:

[0021] The maximum CO2 measurement value corresponding to the peak time that does not change with the increase of well depth is used as the first measurement value.

[0022] In some preferred embodiments, the starting point and the ending point of the CO2 appearance in the CO2 non-abnormal well section corresponding to the first measurement value are obtained as the CO2 starting inflection point and the CO2 ending inflection point; the maximum CO2 measurement value is obtained between the CO2 starting inflection point and the CO2 ending inflection point;

[0023] Calculate the interval from the time of the CO2 starting inflection point to the time of the maximum CO2 measurement value as the first time T1;

[0024] Calculate the interval from the time of the CO2 termination inflection point to the time of the maximum CO2 measurement value as the second time T2;

[0025] The maximum CO2 measurement value corresponding to the CO2 non-abnormal well section where both T1 and T2 are less than or equal to the first preset time is taken as a single peak.

[0026] Another aspect of the present invention provides a CO2 true and false display gas measurement identification system, based on a CO2 true and false display gas measurement identification method, the system comprises:

[0027] A drilling status acquisition module is configured to acquire a well logging diagram during the drilling process; extract the characteristics of the drilling parameters from the well logging diagram, and then obtain the drilling status;

[0028] A measurement value acquisition module, which is configured to detect the CO2 content in the wellbore through a gas monitor to obtain a CO2 measurement value when it is monitored that the drilling state is after connecting a column or a pole and drilling is performed again;

[0029] An abnormal well section acquisition module is configured to acquire a base value of CO2 content; based on the base value and the CO2 measurement value, obtain a CO2 abnormal well section;

[0030] A peak time acquisition module, when a CO2 non-abnormal well section appears after the CO2 abnormal well section is obtained, obtains the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum, as the first time; calculates the difference between the first time and the start time of the CO2 measurement value obtained again, as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value;

[0031] A first true or false display judgment module determines whether there is a single peak according to the peak time by using a pre-built single peak judgment method;

[0032] If yes, jump to the second true or false display judgment module; if no, take the CO2 abnormal well section as the CO2 false display well section, jump to the drilling status acquisition module, and re-perform CO2 true or false display identification until the drilling is completed;

[0033] The second true or false display judgment module regards the CO2 abnormal well section before the first single peak appears as the CO2 true display well section, and jumps to the drilling status acquisition module to re-perform CO2 true or false display identification until the drilling is completed.

[0034] According to a third aspect of the present invention, an electronic device is provided, comprising:

[0035] at least one processor; and

[0036] a memory communicatively connected to at least one of the processors; wherein,

[0037] The memory stores instructions that can be executed by the processor, and the instructions are used to be executed by the processor to implement the above-mentioned CO2 true and false display gas measurement identification method.

[0038] In a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to be executed by the computer to implement the above-mentioned CO2 true and false display gas measurement identification method.

[0039] Beneficial effects of the present invention:

[0040] The present invention discloses a method for identifying true and false CO2 gas logging. The method determines whether the CO2 anomaly is a true indication generated by the formation or a false indication generated by a drilling fluid additive based on whether a single CO2 peak appears in the gas logging. If a single CO2 peak appears when connecting a single root or erecting a column after the gas logging detects the CO2 anomaly, the detected CO2 anomaly is a true indication generated by the formation. If no single CO2 peak appears, it is a false indication generated by the drilling fluid additive. The present invention solves the problem of identifying the true and false CO2 generated by multiple sources during the drilling process, provides a basis for drilling fluid adjustment for the drilling construction party, and helps the construction party find valuable CO2 gas reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0042] Figure 1 It is a flow chart of a CO2 true and false display gas detection identification method of the present invention;

[0043] Figure 2 It is a schematic diagram of a characteristic curve of true display gas logging parameters in a CO2 true and false display gas logging identification method of the present invention;

[0044] Figure 3 It is a schematic diagram of a characteristic curve of false display gas logging parameters in a CO2 true and false display gas logging identification method of the present invention;

[0045] Figure 4 This is a schematic diagram of a single peak judgment in a CO2 true and false display gas measurement identification method of the present invention;

[0046] Figure 5 It is a structural diagram of a computer system of a server for implementing the method, system, and device embodiments of the present application. DETAILED DESCRIPTION

[0047] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0048] 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.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the first embodiment of the present invention provides a CO2 true and false display gas measurement identification method, the method comprising the following steps:

[0050] Step S10, during the drilling process, obtaining a well logging diagram; extracting the characteristics of the drilling parameters from the well logging diagram, and then obtaining the drilling status;

[0051] Step S20, when it is monitored that the drilling state is after connecting the column or the pole and drilling is being performed again, the CO2 content in the wellbore is detected by a gas monitor to obtain a CO2 measurement value;

[0052] Step S30, obtaining a base value of CO2 content; based on the base value and the CO2 measurement value, obtaining a CO2 abnormal well section;

[0053] Step S40, after obtaining the CO2 abnormal well section, when a CO2 non-abnormal well section appears, obtain the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum, as the first time; calculate the difference between the first time and the start time of obtaining the CO2 measurement value again, as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value;

[0054] Step S50, judging whether there is a single peak according to the peak time by using a pre-constructed single peak judgment method;

[0055] If yes, jump to step S60; if no, take the CO2 abnormal section as the CO2 false display section, jump to step S10, and re-perform CO2 true and false display identification until the drilling is completed;

[0056] Step S60, taking the well section with CO2 anomaly before the first CO2 single peak appears as the CO2 true display well section, and jumping to step S10 to re-perform CO2 true and false display identification until the drilling is completed.

[0057] Wherein, in step S10, a well logging diagram is obtained after a certain time interval, and the certain time is determined by the time of uncovering a set of display layers.

[0058] The present invention is based on the single peak generation mechanism, and has a good effect in identifying the true and false display of CO2. In the drilling process, after drilling a drill rod or a column, a new drill rod or column is connected to continue drilling. When the drill rod or column is connected, the drilling fluid is in a static state. The gas in the drilled gas-bearing stratum will invade into the wellbore and gather under the action of the pressure difference. After the drill rod or column is connected, the drilling fluid is recirculated for drilling. This part of the gas is detected by the gas detector, which is called a single peak. If there is no high-pressure gas-bearing layer in the drilled stratum, gas will not gather in the wellbore when the drill rod or column is connected, and no single peak will appear. In general, single peaks are mostly reactions of hydrocarbon gases, and single peaks of CO2 gas rarely appear. A single peak is the gas in the drilled gas-bearing stratum that is detected again. It is not a gas-bearing reaction of the newly uncovered stratum, so it is called a false display and should be eliminated in the official data. In actual operation, after the CO2 abnormality occurs, we need to see whether a single peak appears afterwards. If a single peak appears, the previous CO2 abnormality is a true display. If there is no single peak, it is a false display caused by the drilling fluid additive.

[0059] Preferably, the characteristics of drilling parameters extracted from the well logging diagram include: well depth, drilling pressure, hook load, drill head speed, standpipe pressure, pump stroke, outlet density, outlet conductivity, outlet temperature, and CO2 measurement value.

[0060] Preferably, when the drilling pressure, the hook load, the drill head speed, the riser pressure, the pump stroke, the outlet density, and the outlet conductance are all zero, the outlet temperature is the set temperature, and the CO2 measurement value is zero, the drilling state is connecting the column or the pole.

[0061] Preferably, the CO2 abnormal well section and the CO2 non-abnormal well section are obtained by:

[0062] The well section where the CO2 measurement value is greater than the set multiple of the base value is judged as the CO2 abnormal well section; if so, it is the CO2 abnormal well section, otherwise it is the CO2 non-abnormal well section.

[0063] The set multiple is 2-10 times, and is preferably 2 times in this embodiment.

[0064] Preferably, a pre-constructed single peak determination method is used to determine whether a single peak exists, and the method is as follows:

[0065] When the peak time corresponding to each CO2 non-abnormal well section is less than or equal to the late time, and the first peak time is equal to the late time, a first measurement value is obtained by combining the maximum CO2 measurement value corresponding to the CO2 non-abnormal well section and the increase in well depth, and a single peak is obtained by judging based on the first measurement value and the first preset time;

[0066] The delayed time is the time it takes for the gas to be released from the bottom of the well to the ground and then be sent to the gas detection instrument for detection.

[0067] Preferably, the first measurement value is:

[0068] The maximum CO2 measurement value corresponding to the peak time that does not change with the increase of well depth is used as the first measurement value.

[0069] Preferably, see Figure 4 , obtaining the starting point and the ending point of the CO2 appearance in the CO2 non-abnormal well section corresponding to the first measurement value as the CO2 starting inflection point and the CO2 ending inflection point; obtaining the maximum CO2 measurement value between the CO2 starting inflection point and the CO2 ending inflection point;

[0070] Calculate the interval from the time of the CO2 starting inflection point to the time of the maximum CO2 measurement value as the first time T1;

[0071] Calculate the interval from the time of the CO2 termination inflection point to the time of the maximum CO2 measurement value as the second time T2;

[0072] The maximum CO2 measurement value corresponding to the CO2 non-abnormal well section where both T1 and T2 are less than or equal to the first preset time is taken as a single peak.

[0073] Wherein, the single peak is a sharp peak that rises and falls quickly.

[0074] Wherein, the first preset time is 5 minutes.

[0075] like Figure 2 As shown, Figure 2 1. CO2 display; 2. Single peak; 3. Single peak; 4. Single peak; 5. Drilling pressure, hook load, rotary table speed; 6. Standpipe pressure, 1# pump stroke, 2# pump stroke; 7. Outlet density, outlet temperature, outlet conductivity; 8. Total hydrocarbons, CO2; 9. Drilling pressure, hook load, rotary table speed; 10. Standpipe pressure, 1# pump stroke, 2# pump stroke; 11. Outlet density, outlet temperature, outlet conductivity; 12. Total hydrocarbons, CO2; 13 Drilling pressure, hook load, rotary table speed; 14. Standpipe pressure, 1# pump stroke, 2# pump stroke; 15. Outlet density, outlet temperature, outlet conductivity; 16. Total hydrocarbons, CO2.

[0076] True display embodiment, Figure 2 This is the well logging diagram of Well X9 in Area X of Depression B.

[0077] During the drilling process, the columns were connected when the well depths reached 2829.85m, 2858.52m, 2886.95m, and 2915.13m. The gas logging did not detect CO2 anomalies before the late well depth of 2829m, and CO2 became active after the late well depth of 2829m. Hereinafter, "late well depth" is referred to as "well depth".

[0078] According to the CO2 active display, drilling conditions and abnormal layer division standards, one CO2 abnormal section and three CO2 abnormal points were divided in the section 2820-2920m. The abnormal points are the peak points in the non-abnormal sections, and the sections where abnormal points 2, 3 and 4 are located are non-abnormal sections.

[0079] Abnormal section 1, well section 2829-2832m, thickness 3m, CO2 display value is as follows Figure 2 As shown in Figure 1, the displayed value is 16.4%. The late time is 30 minutes.

[0080] Further abnormal point 2, well depth 2857m, CO2 display value is as follows Figure 2 As shown in Figure 2, the displayed value is 8.2%, which is a sharp peak with a rapid rise and fall, lasting for about 4.5 minutes and a peak time of 30 minutes, which is the same as the late arrival time.

[0081] Further abnormal point 2, 30 minutes before that, the well depth reached 2858.52m, and the drilling pressure, hook load and drill speed were all zero. Figure 2 As shown in 5; the riser pressure, 1# pump stroke and 2# pump stroke are all zero, such as Figure 2 As shown in 6; the outlet density and outlet conductivity are both zero, and the outlet temperature is 20℃, such as Figure 2 As shown in 7; CO2 is zero, such as Figure 2 As shown in Figure 8. From the above parameter characteristics, it can be seen that this is a connection column.

[0082] Further, as for abnormal point 2, it can be known from the above parameter characteristics that abnormal point 2 is a single peak of abnormal segment 1.

[0083] Further abnormal point 3, well depth 2887m, CO2 display value is as follows Figure 2 As shown in Figure 3, the displayed value is 7.6%, which is a sharp peak with rapid rise and fall, lasting for about 4.5 minutes and peaking time of 30 minutes, which is the same as the peak time of abnormal point 2.

[0084] Further abnormal point 3, 30 minutes before that, the well depth reached 2886.95m, and the drilling pressure, hook load and drill speed were all zero. Figure 2 As shown in 9, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 2 As shown in 10; the outlet density and outlet conductivity are both zero, and the outlet temperature is 20°C, such as Figure 2As shown in 11; CO2 is zero, such as Figure 2 As shown in 12. From the above parameter characteristics, it can be known that this is a connection column.

[0085] Further, as for abnormal point 3, it can be known from the above parameter characteristics that abnormal point 3 is also a single peak of abnormal segment 1.

[0086] Further abnormal point 4, well depth 2916m, CO2 display value is as follows Figure 2 As shown in Figure 4, the displayed value is 6.5%, which is a fast-rising and fast-falling peak, lasting for about 4 minutes and with a peak time of 30 minutes, which is the same as the peak time of abnormal points 2 and 3.

[0087] Further abnormal point 4, 30 minutes before that, the well depth reached 2915.13m, and the drilling pressure, hook load and drill speed were all zero. Figure 2 As shown in 13, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 2 As shown in 14; the outlet density and outlet conductivity are both zero, and the outlet temperature is 22°C, such as Figure 2 As shown in 15; CO2 is zero, such as Figure 2 As shown in 16. From the above parameter characteristics, it can be known that the column is connected here.

[0088] Further, as for abnormal point 4, it can be known from the above parameter characteristics that abnormal point 4 is also a single peak of abnormal segment 1.

[0089] After the gas detector detects CO2, a single CO2 peak will appear each time the column is connected, and the CO2 anomaly in abnormal section 1 is judged to be a true display of the formation.

[0090] Exception layer verification:

[0091] The well was drilled to 3500m and completed. At the depth of 2830m, the RDT test technology was used to obtain the formation fluid and obtain 200cm 3 Gas, gas sample composition analysis, CO2 accounts for 99.5%, the test results are consistent with the above judgment.

[0092] like Figure 3 As shown, Figure 3Middle: 1. CO2 display; 2. Single peak; 3. Single peak; 4. Single peak; 5. Single peak, 6. Drilling pressure, hook load, rotary table speed; 7. Standpipe pressure, 1# pump stroke, 2# pump stroke; 8. Outlet density, outlet temperature, outlet conductivity; 9. Total hydrocarbons, CO2; 10. Drilling pressure, hook load, rotary table speed; 11. Standpipe pressure, 1# pump stroke, 2# pump stroke; 12. Outlet density, outlet temperature, outlet conductivity; 13. Total hydrocarbons, CO2; 14. Drilling pressure, hook load, rotary table speed; 15. Standpipe pressure, 1# pump stroke, 2# pump stroke; 16. Outlet density, outlet temperature, outlet conductivity; 17. Total hydrocarbons, CO2; 18. Drilling pressure, hook load, rotary table speed; 19. Standpipe pressure, 1# pump stroke, 2# pump stroke; 20. Outlet density, outlet temperature, outlet conductivity; 21. Total hydrocarbons, CO2.

[0093] Fake display example, Figure 3 This is the well logging diagram of Well X10 in Area X of Depression B.

[0094] During the drilling process, CO2 began to appear at a depth of 3237.50m, and the high value lasted for about 22 minutes. After that, CO2 remained at about 4.5% and showed a gradually decreasing trend. Based on the active CO2 display, drilling conditions, and abnormal layer division standards, 3237.50-3240.00m was determined to be the CO2 abnormal section.

[0095] The abnormal section is 3237.50-3240.00m, with a thickness of 2.50m. The CO2 display value is as follows Figure 3 As shown in Figure 1, the displayed value is 12.4%. The late time is 40 minutes.

[0096] When the drilling depth reaches 3246.24m and the later reaches 3243.56m, the drilling pressure, hook load and drill speed are all zero. Figure 3 As shown in 6, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 3 As shown in 7; the outlet density and outlet conductivity are both zero, and the outlet temperature is 21°C, such as Figure 3 As shown in 8; CO2 is zero, such as Figure 3 As shown in Figure 9. From the above parameter characteristics, it can be seen that this is the first single connection after drilling through the CO2 abnormal layer.

[0097] For the first single connection, after the drilling fluid resumes circulation and drilling, if there is a single peak, it should appear after 40 minutes. Figure 3 As shown in 2, Figure 3 No single peak appears in the middle 2.

[0098] When the drilling depth reaches 3255.81m and the later reaches 3253.24m, the drilling pressure, hook load and drill speed are all zero. Figure 3As shown in 10, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 3 As shown in 11; the outlet density and outlet conductivity are both zero, and the outlet temperature is 25°C, such as Figure 3 As shown in 12; CO2 is zero, such as Figure 3 As shown in Figure 13. From the above parameter characteristics, it can be seen that this is the second single connection after drilling through the CO2 abnormal layer.

[0099] For the second single-root connection, after the drilling fluid resumes circulation and drilling, if there is a single-root peak, it should appear after 40 minutes. Figure 3 As shown in 3, Figure 3 No single peak appeared in the middle 3.

[0100] When the drilling depth reaches 3265.37m and the later reaches 3261.76m, the drilling pressure, hook load and drill speed are all zero. Figure 3 As shown in 14, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 3 As shown in 15; the outlet density and outlet conductivity are both zero, and the outlet temperature is 22°C, such as Figure 3 As shown in 16; CO2 is zero, such as Figure 3 As shown in Figure 17. From the above parameter characteristics, it can be seen that this is the third single connection after drilling through the CO2 abnormal layer.

[0101] For the third single-root connection, after the drilling fluid resumes circulation and drilling, if there is a single-root peak, it should appear after 40 minutes. Figure 3 As shown in 4, Figure 3 No single peak appeared in the middle 4.

[0102] When the drilling depth reaches 3274.91m and the later reaches 3270.26m, the drilling pressure, hook load and drill speed are all zero. Figure 3 As shown in 18, the riser pressure, 1# pump stroke and 2# pump stroke are all zero. Figure 3 As shown in 19; the outlet density and outlet conductivity are both zero, and the outlet temperature is 22°C, such as Figure 3 As shown in 20; CO2 is zero, such as Figure 3 As shown in Figure 21. From the above parameter characteristics, it can be seen that this is the fourth single connection after drilling through the CO2 abnormal layer.

[0103] For the fourth single-root connection, after the drilling fluid resumes circulation and drilling, if there is a single-root peak, it should appear after 40 minutes. Figure 3 As shown in Figure 5, Figure 3 No single peak appeared in the 5th position.

[0104] After the gas detector detected CO2, no CO2 single root peak appeared in four consecutive single root connections. It was judged that the CO2 anomaly in the 3237.50-3240.00m well section was not generated by the formation, but was caused by drilling fluid additives and was a false display.

[0105] Exception layer verification:

[0106] The well was drilled to a depth of 4500m and the RDT test technology was used to obtain formation fluid at a depth of 3239m. No fluid was obtained, and the test results were consistent with the above judgment.

[0107] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0108] A CO2 true and false display gas measurement identification system according to a second embodiment of the present invention is based on a CO2 true and false display gas measurement identification method, and the system includes:

[0109] A drilling status acquisition module is configured to acquire a well logging diagram during the drilling process; extract the characteristics of the drilling parameters from the well logging diagram, and then obtain the drilling status;

[0110] A measurement value acquisition module, which is configured to detect the CO2 content in the wellbore through a gas monitor to obtain a CO2 measurement value when it is monitored that the drilling state is after connecting a column or a pole and drilling is performed again;

[0111] An abnormal well section acquisition module is configured to acquire a base value of CO2 content; based on the base value and the CO2 measurement value, obtain a CO2 abnormal well section;

[0112] A peak time acquisition module, when a CO2 non-abnormal well section appears after the CO2 abnormal well section is obtained, obtains the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum, as the first time; calculates the difference between the first time and the start time of the CO2 measurement value obtained again, as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value;

[0113] A first true or false display judgment module determines whether there is a single peak according to the peak time by using a pre-built single peak judgment method;

[0114] If yes, jump to the second true or false display judgment module; if no, take the CO2 abnormal well section as the CO2 false display well section, jump to the drilling status acquisition module, and re-perform CO2 true or false display identification until the drilling is completed;

[0115] The second true or false display judgment module regards the CO2 abnormal well section before the first single peak appears as the CO2 true display well section, and jumps to the drilling status acquisition module to re-perform CO2 true or false display identification until the drilling is completed.

[0116] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0117] It should be noted that the CO2 true and false display gas measurement identification system provided in the above embodiment is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not regarded as improper limitations of the present invention.

[0118] An electronic device according to a third embodiment of the present invention includes:

[0119] at least one processor; and

[0120] a memory communicatively connected to at least one of the processors; wherein,

[0121] The memory stores instructions that can be executed by the processor, and the instructions are used to be executed by the processor to implement the above-mentioned CO2 true and false display gas measurement identification method.

[0122] A computer-readable storage medium according to a fourth embodiment of the present invention stores computer instructions, and the computer instructions are used to be executed by the computer to implement the above-mentioned CO2 true and false display gas measurement identification method.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process and related instructions of the storage device and processing device described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0124] Those skilled in the art should be able to appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two, and the programs corresponding to the software modules and method steps can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the technical field. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in electronic 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 to exceed the scope of the present invention.

[0125] Reference below Figure 5 , which shows a schematic diagram of the structure of a computer system of a server for implementing the method, system, and device embodiments of the present application. Figure 5 The server shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0126] like Figure 5 As shown, the computer system includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503. Various programs and data required for system operation are also stored in the RAM 503. The CPU 501, the ROM 502 and the RAM 503 are connected to each other through a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0127] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0128] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 509, and / or installed from the removable medium 511. When the computer program is executed by the central processing unit (CPU) 501, the above-mentioned functions defined in the method of the present application are executed. It should be noted that the above-mentioned computer-readable medium of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, - but not limited to - a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection with one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, an apparatus or a device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, an apparatus or a device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0129] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0130] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0131] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0132] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0133] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A CO2 true and false display gas measurement identification method, characterized in that: The method comprises the following steps: Step S10, during the drilling process, obtaining a well logging diagram; extracting the characteristics of the drilling parameters from the well logging diagram, and then obtaining the drilling status; Step S20, when it is monitored that the drilling state is after connecting the column or the pole and drilling is being performed again, the CO2 content in the wellbore is detected by a gas monitor to obtain a CO2 measurement value; Step S30, obtaining a base value of CO2 content; based on the base value and the CO2 measurement value, obtaining a CO2 abnormal well section; Step S40, when a CO2 non-abnormal well section appears after the CO2 abnormal well section is obtained, the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum is obtained as the first time; Calculate the difference between the first time and the start time of obtaining the CO2 measurement value again as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value; Step S50, judging whether there is a single peak according to the peak time by using a pre-constructed single peak judgment method; If yes, jump to step S60; if no, take the CO2 abnormal section as the CO2 false display section, jump to step S10, and re-perform CO2 true and false display identification until the drilling is completed; Step S60, taking the CO2 abnormal section before the first single peak appears as the CO2 true display section, and jumping to step S10 to re-perform CO2 true and false display identification until the drilling is completed.

2. A CO2 true and false display gas measurement identification method according to claim 1, characterized in that: The characteristics of drilling parameters extracted from the well logging diagram include: well depth, drilling pressure, hook load, drill head speed, standpipe pressure, pump stroke, outlet density, outlet conductivity, outlet temperature, and CO2 measurement value.

3. A CO2 true and false display gas measurement identification method according to claim 2, characterized in that: When the drilling pressure, the hook load, the drill head speed, the standpipe pressure, the pump stroke, the outlet density, and the outlet conductance are all zero, the outlet temperature is the set temperature, and the CO2 measurement value is zero, the drilling state is connecting the column or the pole.

4. A CO2 true and false display gas measurement identification method according to claim 1, characterized in that: The CO2 abnormal well section and the CO2 non-abnormal well section are obtained by: The well section where the CO2 measurement value is greater than the set multiple of the base value is judged as the CO2 abnormal well section; if so, it is the CO2 abnormal well section, otherwise it is the CO2 non-abnormal well section.

5. A CO2 true and false display gas measurement identification method according to claim 1, characterized in that: The pre-built single peak determination method is used to determine whether a single peak exists. The method is as follows: When the peak time corresponding to each CO2 non-abnormal well section is less than or equal to the late time, and the first peak time is equal to the late time, a first measurement value is obtained by combining the maximum CO2 measurement value corresponding to the CO2 non-abnormal well section and the increase in well depth, and a single peak is obtained by judging based on the first measurement value and the first preset time; The delayed time is the time it takes for the gas to be released from the bottom of the well to the ground and then be sent to the gas detection instrument for detection.

6. A CO2 true and false display gas measurement identification method according to claim 5, characterized in that: The first measurement value is: The maximum CO2 measurement value corresponding to the peak time that does not change with the increase of well depth is used as the first measurement value.

7. A CO2 true and false display gas measurement identification method according to claim 6, characterized in that: Obtaining the starting point and ending point of CO2 appearance in the CO2 non-abnormal well section corresponding to the first measurement value as the CO2 starting inflection point and the CO2 ending inflection point; obtaining the maximum CO2 measurement value between the CO2 starting inflection point and the CO2 ending inflection point; Calculate the interval from the time of the CO2 starting inflection point to the time of the maximum CO2 measurement value as the first time T1; Calculate the interval from the time of the CO2 termination inflection point to the time of the maximum CO2 measurement value as the second time T2; The maximum CO2 measurement value corresponding to the CO2 non-abnormal well section where both T1 and T2 are less than or equal to the first preset time is taken as a single peak.

8. A CO2 true and false display gas measurement identification system, characterized in that: A CO2 true and false display gas measurement identification method based on any one of claims 1 to 7, the system comprises: A drilling status acquisition module is configured to acquire a well logging diagram during the drilling process; extract the characteristics of the drilling parameters from the well logging diagram, and then obtain the drilling status; A measurement value acquisition module, which is configured to detect the CO2 content in the wellbore through a gas monitor to obtain a CO2 measurement value when it is monitored that the drilling state is after connecting a column or a pole and drilling is performed again; An abnormal well section acquisition module is configured to acquire a base value of CO2 content; based on the base value and the CO2 measurement value, obtain a CO2 abnormal well section; A peak time acquisition module, when a CO2 non-abnormal well section appears after the CO2 abnormal well section is obtained, obtains the time when the CO2 measurement value of the CO2 non-abnormal well section reaches the maximum, as the first time; calculates the difference between the first time and the start time of the CO2 measurement value obtained again, as the peak time; wherein the CO2 non-abnormal well section is determined based on the base value and the CO2 measurement value; A first true or false display judgment module determines whether there is a single peak according to the peak time by using a pre-built single peak judgment method; If yes, jump to the second true or false display judgment module; if no, take the CO2 abnormal well section as the CO2 false display well section, jump to the drilling status acquisition module, and re-perform CO2 true or false display identification until the drilling is completed; The second true or false display judgment module regards the CO2 abnormal well section before the first single peak appears as the CO2 true display well section, and jumps to the drilling status acquisition module to re-perform CO2 true or false display identification until the drilling is completed.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to at least one of the processors; wherein, The memory stores instructions executable by the processor, and the instructions are used to be executed by the processor to implement a CO2 true and false display gas measurement identification method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to be executed by the computer to implement the CO2 true and false display gas measurement identification method according to any one of claims 1-7.

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