A device and process for real-time online analysis of carbon isotopes in drilling and logging sites

Abstract

The present application relates to the technical field of oil production engineering, and particularly relates to a drilling and logging site carbon isotope real-time online analysis device, which comprises a front gas taking device connected between a carbon dioxide analyzer and an isotope analyzer in a comprehensive logging instrument; the isotope analyzer is connected with the comprehensive logging instrument in a network mode and keeps time synchronization with a server of the comprehensive logging instrument; a first pressure gauge and a drying tube provided with a drying agent are connected with an internal air inlet pipeline of the front sampling box; a two-position three-way joint is connected with a first float flowmeter and an atmospheric pressure gas outlet; the atmospheric pressure gas outlet is connected with a chromatographic gas inlet of the isotope analyzer; the two-position three-way joint is connected with a second float flowmeter through a gas pipeline, and the second float flowmeter is connected with a booster gas pump; a three-way joint is connected with a second pressure gauge; and the three-way joint is connected with the chromatographic gas inlet of the isotope analyzer. The drilling and logging site carbon isotope real-time online analysis device and process method provided by the present application reduce the detection cost and guarantee the timeliness of isotope measurement.

Description

Technical Field

[0001] This invention relates to the field of oil production engineering technology, and in particular to a real-time online carbon isotope analysis device and process for drilling and logging. Background Technology

[0002] In oil and gas exploration, carbon isotopes have been widely used in geological event analysis, oil source correlation, maturity studies, sedimentary environment analysis, and paleoenvironment analysis. However, current isotope analysis involves sampling and sealing at the drilling and logging site, followed by single-point measurements in the laboratory. This significantly limits its application in oil and gas exploration. Achieving online isotope monitoring while drilling has become a technical bottleneck restricting the widespread application of isotopes. The most critical issue is integrating isotopes with integrated logging tools or pre-installed automatic continuous sampling devices. These devices need to be connected in series and parallel with the integrated logging gas and electrical circuits. Therefore, gas flow rate and pressure control are necessary to achieve two objectives: first, to control the input sample gas flow rate from 100ml / min-500ml / min to 0.1-0.2ml / min; and second, to reduce the output sample gas pressure from 10-20bar to 1-2bar. The precise control range of flow rate and pressure makes it possible for no similar gas pre-sampling automatic sampling device, either domestically or internationally, to achieve the function and purpose of continuous, online isotope analysis. Summary of the Invention

[0003] (a) Technical problems to be solved This invention provides a real-time online carbon isotope analysis device and process for drilling and logging sites, overcoming the shortcomings of existing isotope analyses, which require sampling and sealing at the drilling and logging site and can only be performed in a laboratory at a single point. This results in untimely isotope measurements, low detection efficiency, and high detection costs.

[0004] (II) Technical Solution To address the aforementioned problems, the present invention provides a real-time online carbon isotope analysis device for drilling and logging sites, comprising a pre-gas sampling device. The pre-gas sampling device is connected between the carbon dioxide analyzer and the isotope analyzer in the integrated logging instrument. One end of the device is connected to the exhaust port of the carbon dioxide analyzer in the integrated logging instrument, and the other end is connected to the chromatographic inlet of the isotope analyzer. The isotope analyzer is network-connected to the integrated logging instrument and keeps time synchronized with the integrated logging instrument server. The pre-gas sampling device includes a pre-sampling box; The exhaust gas from the carbon dioxide analyzer in the integrated logging tool enters the inlet of the pre-sampling box through the gas pipeline, and then enters the interior of the pre-sampling box. The air inlet pipe inside the pre-sampling chamber is connected to a first pressure gauge and a drying tube containing a desiccant; the first pressure gauge is used to measure the pressure of the gas entering through the air inlet. The other end of the drying tube is connected to the first interface of a two-position tee connector via an air pipeline. The second port of the two-way three-way connector is connected to the first float flow meter via an air pipeline, and the other end of the first float flow meter is connected to the atmospheric pressure outlet located on the top of the pre-sampling box; the atmospheric pressure outlet is connected to the chromatographic inlet of the isotope analyzer. The third port of the two-position three-way connector is connected to the second float flow meter via an air pipeline, and the other end of the second float flow meter is connected to a booster air pump. The outlet of the booster pump is connected to an air pipeline, which is connected to one of the branch pipes of the third tee connector; the other branch pipe of the tee connector is connected to a second pressure gauge. The third branch pipe of the three-way connector is connected to the chromatographic inlet of the isotope analyzer through the pressurized air outlet located at the top of the pre-sampling box.

[0005] Preferably, a first tee connector is connected between the gas pipeline and the pre-sampling box; one of the joints of the tee connector is connected to a one-way valve leading to a pressure relief port.

[0006] Preferably, the air inlet of the pre-sampling box is provided with a first pipeline quick-lock connector.

[0007] Preferably, the air outlet of the pre-sampling box is provided with a second pipeline quick-lock connector.

[0008] Preferably, the pre-sampling box is provided with a third pipeline quick-lock connector at the pressurized air outlet.

[0009] Preferably, the air pump switch on the booster air pump is fixed on the front sampling box.

[0010] Preferably, the desiccant is calcium chloride.

[0011] On the other hand, the present invention provides a real-time online carbon isotope analysis process method at the drilling and logging site, wherein the isotope analyzer receives and saves the WITS records sent by the integrated logging instrument, and synchronizes the time of the integrated logging instrument with the time of the isotope analyzer. When the first pressure gauge detects that the pressure of the sample gas is higher than the threshold, the two-position three-way connector is opened, and the sample gas passes through the first float flow meter and directly enters the isotope analyzer through the atmospheric pressure outlet. When the first pressure gauge detects that the pressure of the sample gas is lower than the threshold, the third port of the two-position three-way connector is opened. The sample gas passes through the second float flow meter and the booster pump increases the pressure to above the threshold. The voltage value after boosting is detected and displayed by the second pressure gauge. The pressurized sample gas enters the isotope analyzer through the pressurized gas outlet.

[0012] Preferably, the synchronization setting between the time of the integrated logging instrument and the time of the isotope analyzer includes: The isotope analyzer compares its current system time with the time information received from the integrated logging instrument. If they match, no changes are made. If the two are inconsistent, the current system time will be changed to the integrated logging instrument server time.

[0013] (III) Beneficial Effects The device and process for real-time online carbon isotope analysis at the drilling and logging site provided by this invention, through the setting of a pre-positioned gas sampling device, can effectively connect the gas analysis system of the integrated logging instrument with the isotope analyzer, realizing real-time continuous online analysis of carbon isotopes of methane, ethane, and propane while performing gas logging analysis with the integrated logging instrument. This solves the technical problem that carbon isotopes can only be measured at points, reduces detection costs, ensures the timeliness of isotope measurements, and provides technical means for comprehensive formation evaluation and oil and gas exploration. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the real-time online carbon isotope analysis device for drilling and logging of the present invention; Figure 2 This is a structural diagram of the real-time online carbon isotope analysis device for drilling and logging of the present invention. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figure 1-2 As shown, the present invention provides a real-time online carbon isotope analysis device for drilling and logging sites, comprising: a pre-gas sampling device connected to the exhaust port 1 of a carbon dioxide analyzer via a gas pipeline 2, the other end of the gas pipeline 2 being connected to a branch pipe ① of a first tee connector 3; a branch pipe ② of the first tee connector 3 being connected to a one-way valve 4 leading to a pressure relief port 5 for facilitating the discharge of excess gas; and a branch pipe ③ of the gas pipeline connected to the first tee connector 3 being connected to a first pipeline quick-lock connector 7 fixed on a pre-sampling box 23 in the pre-gas sampling device, serving as an air inlet 6, entering the interior of the pre-gas sampling device box 23; The air intake line is connected to the branch pipe ① of the second three-way connector 22, the branch pipe ② is connected to the first pressure gauge 21 through the air line, and the branch pipe ③ is connected to the drying pipe 8 through the air line. The desiccant is calcium chloride. The other end of the drying tube 8 is connected to port 2 of the two-position tee connector 19 via an air line; Port 1 of the two-way three-way connector 19 is connected to the first float flow meter 20 through the gas pipeline. The other end of the first float flow meter 20 is connected to the second pipeline quick-lock connector 9 fixed on the front gas intake device box 23 through the gas pipeline. It is connected to the chromatographic gas inlet 13 of the isotope analyzer through the atmospheric pressure gas outlet 10. The No. 3 port of the two-way three-way connector 19 is connected to the second float flow meter 18 through the air pipeline. The other end of the second float flow meter 18 is connected to the booster air pump 16 through the air pipeline. The air pump switch 17 of the booster air pump 16 is fixed on the front air intake device box 23. The outlet of the booster pump 16 is connected to the gas pipeline and is connected to the branch pipe ③ of the third tee connector 15. The branch pipe ② of the third tee connector 15 is connected to the second pressure gauge 11. The branch pipe ① of the third tee connector 15 is connected to the third pipeline quick-lock connector 14 fixed in the pre-positioned gas intake device box 23 through the gas pipeline, and is connected to the chromatographic inlet 13 of the isotope analyzer through the booster outlet 12.

[0017] When the pressure of the sample gas is higher than the threshold (which can be set to, for example, 1.8 kPa), and the first pressure gauge 21 displays the pressure value, port 1 of the two-position three-way connector 19 is opened. The sample gas passes through the first float flowmeter 20 and directly enters the isotope analyzer chromatograph from the atmospheric pressure outlet 10. When the pressure of the sample gas is lower than the threshold (1.8 kPa), and the first pressure gauge 21 displays the pressure value, port 3 of the two-position three-way connector 19 is opened. The sample gas passes through the second float flowmeter 18 and is then boosted to a pressure of over 1.8 kPa by the booster pump 16. The second pressure gauge 11 displays the pressure value, and the sample gas then enters the isotope analyzer chromatograph from the booster outlet 12.

[0018] In addition, this invention provides a real-time online carbon isotope analysis process for drilling and logging, comprising: The isotope analyzer receives and saves the WITS records sent by the integrated logging instrument, and synchronizes the time of the integrated logging instrument with the time of the isotope analyzer. When the first pressure gauge detects that the pressure of the sample gas is higher than the threshold, the two-position three-way connector is opened, and the sample gas passes through the first float flow meter and directly enters the isotope analyzer through the atmospheric pressure outlet. When the first pressure gauge detects that the pressure of the sample gas is lower than the threshold, the third port of the two-position three-way connector is opened. The sample gas passes through the second float flow meter and the booster pump increases the pressure to above the threshold. The voltage value after boosting is detected and displayed by the second pressure gauge. The pressurized sample gas enters the isotope analyzer through the pressurized gas outlet.

[0019] In addition, the present invention also integrates the synchronization setting of the logging instrument time and the isotope analyzer time, including: The isotope analyzer compares its current system time with the time information received from the integrated logging instrument. If they match, no changes are made. If the two are inconsistent, the current system time will be changed to the integrated logging instrument server time.

[0020] The integrated logging instrument server sends WITS records via TCP / IP. The records include time, well depth, and late well depth data, and provide time synchronization services.

[0021] The time synchronization program is enabled to unify the local area network time through the integrated logging server, so that the isotope analyzer keeps time synchronized with the integrated logging server. The integrated logging instrument records the time, well depth, and late well depth data.

[0022] The isotope analyzer receives and saves the WITS records from the integrated logging instrument. It compares its current system time with the integrated logging instrument server time. If they match, no changes are made; otherwise, it changes its system time to the integrated logging instrument server time, accurate to milliseconds, to ensure time synchronization.

[0023] The isotope analyzer can be used in conjunction with the integrated logging instrument for on-site drilling to meet the requirements of the on-site logging process. It can analyze carbon isotope values ​​in real time and achieve good results in oil source finding, engineering early warning of horizontal wells, and selection of "sweet spots".

[0024] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A real-time online carbon isotope analysis device for drilling and logging, characterized in that, It includes a pre-gas sampling device, which is connected between the carbon dioxide analyzer and the isotope analyzer in the integrated logging instrument. One end of the device is connected to the tail gas emission port of the carbon dioxide analyzer in the integrated logging instrument, and the other end is connected to the chromatographic inlet of the isotope analyzer. The isotope analyzer is network-connected to the integrated logging instrument and keeps time synchronized with the integrated logging instrument server. The pre-gas sampling device includes a pre-sampling box; the exhaust gas from the carbon dioxide analyzer in the integrated logging instrument enters the inlet of the pre-sampling box through a gas pipeline, and then enters the interior of the pre-sampling box. The inlet pipe inside the pre-sampling chamber is connected to a first pressure gauge and a drying tube containing a desiccant; the first pressure gauge is used to measure the pressure of the gas entering through the inlet. The other end of the drying tube is connected to the second port of the two-position tee connector via an air pipeline. The first port of the two-way three-way connector is connected to the first float flow meter via an air pipeline, and the other end of the first float flow meter is connected to the atmospheric pressure outlet located on the top of the pre-sampling box; the atmospheric pressure outlet is connected to the chromatographic inlet of the isotope analyzer. The third port of the two-way three-way connector is connected to the second float flow meter via an air pipeline, and the other end of the second float flow meter is connected to a booster air pump. The outlet of the booster pump is connected to an air pipeline, which is connected to one of the branch pipes of the third tee connector; the other branch pipe of the third tee connector is connected to a second pressure gauge. The third branch pipe of the third tee connector is connected to the chromatographic inlet of the isotope analyzer through the pressurized air outlet located at the top of the front sampling box. The isotope analyzer receives and saves the WITS records sent by the integrated logging instrument, and synchronizes the time of the integrated logging instrument with the time of the isotope analyzer. When the first pressure gauge detects that the pressure of the sample gas is higher than the threshold, the first port of the two-position three-way connector is opened, and the sample gas passes through the first float flow meter and directly enters the isotope analyzer through the atmospheric pressure outlet. When the first pressure gauge detects that the pressure of the sample gas is lower than the threshold, port 3 of the two-position three-way connector is opened. The sample gas passes through the second float flow meter and the booster pump increases the pressure to above the threshold. The voltage value after boosting is detected and displayed by the second pressure gauge. The pressurized sample gas enters the isotope analyzer through the pressurized gas outlet.

2. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The gas pipeline and the pre-sampling box are connected by a first tee connector; one of the connectors of the first tee connector is connected to a one-way valve leading to the pressure relief port.

3. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The air inlet of the pre-sampling box is equipped with a first pipeline quick-lock connector.

4. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The pre-sampling box is equipped with a second pipeline quick-lock connector at the atmospheric pressure outlet.

5. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The pre-sampling box is equipped with a third pipeline quick-lock connector at the pressurized air outlet.

6. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The air pump switch on the booster air pump is fixed on the front sampling box.

7. The real-time online carbon isotope analysis device for drilling and logging as described in claim 1, characterized in that, The desiccant is calcium chloride.

8. A process method for using the real-time online carbon isotope analysis device for drilling and logging as described in any one of claims 1-7, characterized in that, Synchronizing the time settings of the integrated logging instrument and the isotope analyzer includes: The isotope analyzer compares its current system time with the time information received from the integrated logging instrument. If they match, no changes are made. If the two are inconsistent, the current system time will be changed to the integrated logging instrument server time.

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