High-sulfur-content water-producing gas well production dynamic simulation device and hydrogen sulfide content determination method

Abstract

The invention discloses a high-sulfur-content water-producing gas well production dynamic simulation device and a hydrogen sulfide content determination method, and belongs to the technical field of sulfur-containing gas well development. The system comprises a production simulation module used for simulating production of a high-sulfur-content water-producing gas well; the water yield metering module is used for drying the wetting output gas generated by the production simulation module; and the sulfur content measuring module is used for desulfurizing the dry output gas generated by the water yield metering module. According to the dynamic production simulation device for the high-sulfur-content water-producing gas well, the gas production rule of the high-sulfur-content water-producing gas well under different production pressure differences and water saturations can be simulated by setting different experimental conditions of different production pressure differences or different initial water saturations, the whole production process simulation of the high-sulfur-content water-producing gas well can be realized, and the production efficiency of the high-sulfur-content water-producing gas well is improved. The operation is simple and easy to realize. Compared with theoretical research, the method has the advantages that the production process of the actual high-sulfur-content water-producing gas well is reduced more visually, and the content and change of the sulfur content in the produced gas can be obtained in time.

Description

Technical Field

[0001] The invention relates to the technical field of sulfur-containing gas well development, and in particular to a high-sulfur-containing water-producing gas well production dynamic simulation device and a method for determining hydrogen sulfide content. Background Art

[0002] The gas produced by high-sulfur gas wells contains toxic gas H 2 S, will not only cause environmental pollution and equipment damage, but also endanger the health of on-site workers. In addition, in the actual production process of gas wells, there will be a certain amount of water production, resulting in low production and poor stable production capacity and rapid decline.

[0003] At present, the existing production simulation experimental device of high-sulfur gas wells does not take into account the water production of gas wells. 2 S will be partially soluble in water, so the H 2 The S content is higher than the H 2 S content; or it only simulates the production of water-producing gas wells and cannot test the H content in the produced gas. 2 S content; or the inability to simulate the production performance of high-sulfur water-producing gas wells. Summary of the invention

[0004] The purpose of the present invention is to provide a high-sulfur water-producing gas well production dynamic simulation device and a hydrogen sulfide content determination method to solve the problem that the existing high-sulfur water-producing gas well production simulation device cannot accurately measure the hydrogen sulfide content.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The present invention provides a high-sulfur water-producing gas well production dynamic simulation device, comprising: a production simulation module, a water production metering module and a sulfur content measurement module;

[0007] The production simulation module is used to simulate the production of a high-sulfur water-producing gas well, obtain the simulated formation pressure value and the pressure values ​​at the inlet and outlet ends of the core to be tested, and generate wetted produced gas;

[0008] The water production metering module is used to dry the wet output gas produced by the production simulation module to obtain the output water volume and the dry output gas;

[0009] The sulfur content measurement module is used to desulfurize the dry output gas generated by the water production metering module, and calculate the sulfur content based on multiple groups of pressure value data and the dry output gas.

[0010] Further, in the high-sulfur water-producing gas well production dynamic simulation device, the production simulation module includes: a gas cylinder, a first constant speed and constant pressure pump, a core holder, and a back pressure valve connected in sequence;

[0011] A first pressure regulating valve is provided between the gas cylinder and the first constant speed and constant pressure pump, and a second pressure regulating valve is provided between the first constant speed and constant pressure pump and the inlet end of the core holder;

[0012] An intermediate container and a first pressure sensor are respectively connected between the first constant speed and constant pressure pump and the second pressure regulating valve via a joint; a confining pressure automatic tracking pump and a second pressure sensor are respectively connected between the second pressure regulating valve and the inlet end of the core clamp via a joint; the confining pressure automatic tracking pump is also connected to the core clamp, and a pressure gauge is provided on the core clamp; a third pressure sensor is connected between the outlet end of the core clamp and the back pressure valve via a joint; the back pressure valve is also connected to the second confining pressure automatic tracking pump.

[0013] The beneficial effect of the above further scheme is that the present invention simulates the production of a high-sulfur water-producing gas well through a production simulation module, and can more intuitively restore the production process of an actual high-sulfur water-producing gas well.

[0014] Furthermore, in the high-sulfur water-producing gas well production dynamic simulation device, the water production metering module includes: multiple groups of water production metering components and a gas flow meter, the inlet ends of the multiple groups of water production metering components are connected in parallel to the production simulation module through joints, and the outlet ends of the multiple groups of water production metering components are connected in parallel to the gas flow meter through joints;

[0015] The water production metering component includes: a high-pressure resistant transparent drying tube.

[0016] The beneficial effect of the above further solution is that the alternating use of the drying tube and the acquisition of the water production can be quickly realized through the water production metering module, which is simple to operate and low in cost.

[0017] Further, in the high-sulfur gas well production dynamic simulation device, the sulfur content measurement module includes: multiple groups of desulfurization components, waste gas recovery tanks and data acquisition terminals, the inlet ends of the multiple groups of desulfurization components are connected in parallel to the water production metering module through joints, and the outlet ends of the multiple groups of desulfurization components are connected in parallel to the waste gas recovery tank and the data acquisition terminal through joints, respectively, and the data acquisition terminal is also connected to the production simulation module and the water production metering module;

[0018] The desulfurization component comprises: a desulfurization bottle.

[0019] The beneficial effects of the above further scheme are: the sulfur content measurement module adopts a widely used desulfurizer, which has a good desulfurization effect, and the material is easy to obtain and has little harm to the human body; the alternating use process of the desulfurization bottle can be quickly realized.

[0020] The present invention also provides a method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, comprising:

[0021] Obtain changes in formation pressure points;

[0022] According to the change of formation pressure point, the above-mentioned high-sulfur water-producing gas well production dynamic simulation device is used to carry out stage production under different formation pressures to obtain the mass of solids in the desulfurization bottle used before and after each stage of production under different formation pressures and the gas flow measured by the gas flow meter during each stage of production;

[0023] According to the mass of solids in the desulfurization bottles used before and after production at each stage under different formation pressures and the gas flow rate measured by the gas flow meter during production at each stage, the predicted value of sulfur content in the production gas at each stage under different formation pressures is obtained;

[0024] The predicted sulfur content in the produced gas at each stage is accumulated to calculate the final sulfur content;

[0025] According to the final sulfur content, the hydrogen sulfide content of the high-sulfur water-producing gas well is obtained.

[0026] The beneficial effects of the present invention are as follows: a high-sulfur water-producing gas well production dynamic simulation device is used to perform dynamic simulation in combination with changes in formation pressure points, sulfur content prediction values ​​are calculated in stages, and the average value of the sulfur content prediction values ​​measured in each stage is taken as the final sulfur content, thereby improving the accuracy of sulfur content testing.

[0027] Furthermore, in the method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, obtaining the mass of solids in the desulfurization bottle used before and after production at each stage under different formation pressures and the gas flow rate measured by the gas flow meter during production at each stage includes:

[0028] Complete the preparation for the operation of the dynamic simulation device for the production of high-sulfur water-producing gas wells, and obtain the mass of the solids in the desulfurization bottle used before the stage production;

[0029] According to the changes in formation pressure points, the high-sulfur water-producing gas well production dynamic simulation device is operated. When the formation pressure drops to the next pressure point, the mass of the solid in the desulfurization bottle used after the stage production at the next pressure point and the gas flow measured by the stage production gas flowmeter are obtained;

[0030] By changing the formation pressure, the mass of solids in the desulfurization bottle used before and after each stage of production under different formation pressures and the gas flow measured by the gas flow meter during each stage of production are obtained.

[0031] The beneficial effect of the above further scheme is: the sulfur content is determined according to the mass of the solid produced in the desulfurization bottle used in the stage production, which is simple to operate and low in cost.

[0032] Furthermore, in the method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, the expression for the predicted sulfur content in the production gas at each stage under different formation pressures is:

[0033]

[0034] Among them, M Si is the predicted sulfur content in the i-th stage; V Si is the hydrogen sulfide H produced under standard conditions in stage i 2 S is the volume of the gas; V is the volume of the gas (C+S)i It is the gas flow measured by the gas flow meter in the i-th stage; i is the stage number.

[0035] The beneficial effect of the above further scheme is: the predicted sulfur content is calculated in stages, and the average value of the predicted sulfur content measured in each stage is taken as the final sulfur content, thereby improving the accuracy of the sulfur content test.

[0036] Furthermore, in the method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, the hydrogen sulfide H produced under the standard state in the i-th stage is 2 The expression for the volume of S gas is:

[0037] V Si The expression is:

[0038] Among them, m 2j is the mass of solids produced in the desulfurization bottle used in stage i; H 2 The relative molecular mass of S is 34.08088; i is the stage number.

[0039] Furthermore, in the method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, the expressions for the final sulfur content and the hydrogen sulfide content in a high-sulfur water-producing gas well are:

[0040]

[0041] in, is the final sulfur content; n is the total number of stages; M S(i-1) is the predicted sulfur content of the i-1th stage; i is the stage number.

[0042] The beneficial effect of the above further scheme is: the predicted sulfur content is calculated in stages, and the average value of the predicted sulfur content measured in each stage is taken as the final sulfur content, thereby improving the accuracy of the sulfur content test.

[0043] Furthermore, in the method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, the expression for the hydrogen sulfide content in a high-sulfur water-producing gas well is:

[0044]

[0045] in, is the hydrogen sulfide content; is the final sulfur content.

[0046] The beneficial effects of the above further scheme are: characterizing the hydrogen sulfide content according to the final sulfur content, calculating the sulfur content prediction value in stages, taking the average of the sulfur content prediction values ​​measured in each stage as the final sulfur content, thereby improving the accuracy of the sulfur content test.

[0047] The present invention has the following beneficial effects:

[0048] The high-sulfur water-producing gas well production dynamic simulation device provided by the present invention can simulate the gas production law of the high-sulfur water-producing gas well under different production pressure differences and water saturations by setting different production pressure differences or different initial water saturations of experimental conditions, and can realize the simulation of the entire production process of the high-sulfur water-producing gas well, and the operation is simple and easy to implement.

[0049] The high-sulfur water-producing gas well production dynamics simulation device provided by the present invention is used to simulate the production dynamics of the high-sulfur gas well, and to measure the water production law during the gas production process and the hydrogen sulfide content in the produced gas; compared with theoretical research, the present invention more intuitively restores the actual production process of the high-sulfur water-producing gas well, and can also timely obtain the content and changes of the sulfur content in the produced gas.

[0050] The device of the present invention provides a simple indoor simulation method for the production of high-sulfur water-producing gas wells, provides analytical data for the reasonable production allocation research of high-sulfur water-producing gas wells, and can effectively and accurately measure the hydrogen sulfide content.

[0051] The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well provided by the present invention utilizes a high-sulfur water-producing gas well production dynamic simulation device, performs dynamic simulation in combination with changes in formation pressure points, calculates the sulfur content prediction value in stages, and takes the average of the sulfur content prediction values ​​measured in each stage as the final sulfur content, thereby improving the accuracy of the sulfur content test. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0053] Figure 1 A structural diagram of a high-sulfur water-producing gas well production dynamic simulation device provided in an embodiment of the present invention;

[0054] Figure 2 A schematic diagram of the structure of a high-sulfur water-producing gas well production dynamic simulation device provided by an embodiment of the present invention;

[0055] Figure 3 A flow chart of a method for determining hydrogen sulfide content in a high-sulfur water-producing gas well provided in an embodiment of the present invention;

[0056] Figure 4 It is the curve of formation pressure, bottom hole flowing pressure and production pressure difference changing with time;

[0057] Figure 5 It is the gas production per second and cumulative gas production curve during the production process;

[0058] Figure 6 It is the cumulative water production curve in the production process;

[0059] Figure 7 It is the variation curve of the cumulative sulfur production and sulfur content in the produced gas;

[0060] Marks and corresponding parts names in the attached drawings:

[0061] Figure 2 The various parts are: 1. gas cylinder; 2. first pressure regulating valve; 3. first constant speed and constant pressure pump; 4. first valve; 5. first pressure sensor; 6. first four-way joint; 7. intermediate container; 8. second pressure regulating valve; 9. second pressure sensor; 10. second four-way joint; 11. pressure gauge; 12. core holder; 13. confining pressure automatic tracking pump; 14. third pressure sensor; 15. first three-way joint; 16. back pressure valve; 17. second constant speed and constant pressure pump; 18. second three-way joint; 19. second valve; 20. third valve; 21. first quick joint; 22. second quick joint; 23. first high-pressure resistant transparent drying tube; 24. second high-pressure resistant transparent drying tube; 25. Third quick connector; 26. Fourth quick connector; 27. Fourth valve; 28. Fifth valve; 29. ​​Sixth valve; 30. Fifth three-way connector; 31. Gas flow meter; 32. Sixth three-way connector; 33. Seventh valve; 34. Eighth valve; 35. Fifth quick connector; 36. First desulfurization bottle; 37. Sixth quick connector; 38. Second desulfurization bottle; 39. Seventh quick connector; 40. Eighth quick connector; 41. Ninth valve; 42. Tenth valve; 43. Third four-way connector; 44. Eleventh valve; 45. Waste gas recovery tank; 46. Data acquisition terminal; 47. Twelfth valve; 48. Fourth three-way connector; 49. Third three-way connector. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] Example 1

[0065] like Figure 1 As shown, a high-sulfur water-producing gas well production dynamic simulation device provided by an embodiment of the present invention includes a production simulation module, a water production metering module and a sulfur content measurement module;

[0066] The production simulation module is used to simulate the production of a high-sulfur water-producing gas well, obtain the simulated formation pressure value and the pressure values ​​at the inlet and outlet ends of the core to be tested, and generate wetted produced gas;

[0067] The water production metering module is used to dry the wet output gas produced by the production simulation module to obtain the output water volume and the dry output gas;

[0068] The sulfur content measurement module is used to desulfurize the dry output gas generated by the water production metering module, and calculate the sulfur content based on multiple groups of pressure value data and the dry output gas.

[0069] Please refer to Figure 2 As shown, in the high-sulfur water-producing gas well production dynamic simulation device provided by the present invention, the production simulation module includes a gas cylinder 1, a first pressure regulating valve 2, a first constant speed and constant pressure pump 3, a first valve 4, a first pressure sensor 5, an intermediate container 7, a second pressure regulating valve 8, a second pressure sensor 9, a pressure gauge 11, a core holder 12, a confining pressure automatic tracking pump 13, a third pressure sensor 14, a back pressure valve 16 and a second constant speed and constant pressure pump 17;

[0070] The gas outlet of the gas cylinder 1 is connected to one end of the first pressure regulating valve 2; the other end of the first pressure regulating valve 2 is connected to one end of the first constant speed constant pressure pump 3; the other end of the first constant speed constant pressure pump 3 is connected to one end of the first valve 4; the other end of the first valve 4 is connected to one end of the first pressure sensor 5, the intermediate container 7 and one end of the second pressure regulating valve 8 through the first four-way connector 6; the other end of the first pressure sensor 5, one end of the second pressure sensor 9 and one end of the third pressure sensor 14 are all connected to the sulfur content measurement module; the second pressure regulating valve The other end of 8 is respectively connected to the other end of the second pressure sensor 9, the core clamp 12 and one end of the confining pressure automatic tracking pump 13 through the second four-way joint 10; the pressure gauge 11 is arranged on the core clamp 12; the core clamp 12 is respectively connected to the other end of the confining pressure automatic tracking pump 13; the core clamp 12 is respectively connected to the other end of the third pressure sensor 14 and the back pressure valve 16 through the first three-way joint 15; the back pressure valve 16 is connected to the second constant speed constant pressure pump 17, and is connected to the water production metering module through the second three-way joint 18.

[0071] In this embodiment, the intermediate container 7 is used to provide sufficient but quantitative gas for the production simulation process, simulating the dynamics of the reservoir pressure gradually decreasing as the production progresses during the production process; the first pressure regulating valve 2 is used to adjust the supply pressure to maintain a relatively stable airflow output speed and keep the inlet pressure of the core holder 12 changing with a stable trend; the confining pressure automatic tracking pump 13 is used to automatically monitor the inlet pressure of the core holder 12, and reasonably set the pressure difference, thereby adjusting the confining pressure; the back pressure valve 16 is used to set the waste pressure. When the outlet pressure is lower than the pressure set by the back pressure valve, the production ends.

[0072] The second pressure sensor 9 and the third pressure sensor 14 are used to monitor the pressure at the inlet and outlet of the core holder 12 in real time, respectively.

[0073] Please refer to Figure 2 As shown, in the high-sulfur water-producing gas well production dynamic simulation device provided by the present invention, the water production metering components in the water production metering module are set to two groups, as follows:

[0074] The water production metering module includes a second valve 19, a third valve 20, a first quick connector 21, a second quick connector 22, a first high-pressure resistant transparent drying tube 23, a second high-pressure resistant transparent drying tube 24, a third quick connector 25, a fourth quick connector 26, a fourth valve 27, a fifth valve 28, a sixth valve 29, a gas flow meter 31 and a twelfth valve 47;

[0075] One end of the second valve 19 and one end of the third valve 20 are both connected to the back pressure valve 16 through the second three-way joint 18; the other end of the second valve 19 is connected to one end of the first high-pressure resistant transparent dry tube 23 through the first quick joint 21; the other end of the third valve 20 is connected to one end of the second high-pressure resistant transparent dry tube 24 through the second quick joint 22; the other end of the first high-pressure resistant transparent dry tube 23 is connected to one end of the fourth valve 27 through the third quick joint 25; the sixth valve 29 is installed on the connecting channel between the third quick joint 25 and one end of the fourth valve 27 through the third three-way joint 49; the other end of the second high-pressure resistant transparent dry tube 24 is connected to one end of the fifth valve 28 through the fourth quick joint 26; the twelfth valve 47 is installed on the connecting channel between the fourth quick joint 26 and one end of the fifth valve 28 through the fourth three-way joint 48; the other end of the fourth valve 27 and the other end of the fifth valve 28 are both connected to the gas flow meter 31 through the fifth three-way joint 30; the gas flow meter 31 is connected to the sulfur content measurement module.

[0076] In this embodiment, the high-pressure transparent drying tube is used to measure the water content in the output gas, including a first high-pressure transparent drying tube 23 and a second high-pressure transparent drying tube 24, and only one of the high-pressure transparent drying tubes is selected for production in each stage; in the stable production period at the initial stage of production, because the water production is relatively large, the high-pressure transparent drying tube is replaced at an interval of 30 minutes and the weight change of the high-pressure transparent drying tube is calculated to measure the water production; in the production decreasing stage, the high-pressure transparent drying tube is replaced at an interval of 1 hour and the weight change of the high-pressure transparent drying tube is calculated to measure the water production, and finally the cumulative water production law is obtained.

[0077] Please refer to Figure 2 As shown, in the high-sulfur water-producing gas well production dynamic simulation device provided by the present invention, the desulfurization components in the sulfur content measurement module are set to two groups, as follows:

[0078] The sulfur content measurement module includes a seventh valve 33, an eighth valve 34, a fifth quick connector 35, a first desulfurization bottle 36, a sixth quick connector 37, a second desulfurization bottle 38, a seventh quick connector 39, an eighth quick connector 40, a ninth valve 41, a tenth valve 42, an eleventh valve 44, an exhaust gas recovery tank 45 and a data acquisition terminal 46;

[0079] One end of the seventh valve 33 and one end of the eighth valve 34 are connected to the gas flow meter 31 through the sixth three-way connector 32; the other end of the seventh valve 33 is connected to the first desulfurization bottle 36 through the fifth quick connector 35; the other end of the eighth valve 34 is connected to the second desulfurization bottle 38 through the sixth quick connector 37; one end of the ninth valve 41 is connected to the first desulfurization bottle 36 through the seventh quick connector 39; one end of the tenth valve 42 is connected to the second desulfurization bottle 38 through the eighth quick connector 40; the other end of the ninth valve 41 and the other end of the tenth valve 42 are respectively connected to the exhaust gas recovery tank 45 and one end of the eleventh valve 44 through the third four-way connector 43; the other end of the eleventh valve 44 is connected to the data acquisition terminal 46; the data acquisition terminal 46 is respectively connected to the other end of the first pressure sensor 5, one end of the second pressure sensor 9, one end of the third pressure sensor 14 and the gas flow meter 31.

[0080] In this embodiment, the first desulfurization bottle 36 and the second desulfurization bottle 38 are provided with rubber stoppers and are filled with saturated copper sulfate solution, and are used to remove hydrogen sulfide gas in the dry gas coming through the gas flowmeter 31. The hydrogen sulfide content is measured by replacing the first desulfurization bottle 36 and the second desulfurization bottle 38 alternately and calculating the increase of solids in the desulfurization bottle used in each stage.

[0081] Preferably, the gas flow meter 31 is used to record the flow of the production gas in the dry gas state; the data acquisition terminal 46 is used to record the pressure of the intermediate container 7, the pressure at both ends of the core clamp 12 and the flow change recorded by the gas flow meter 31 in real time.

[0082] The working process of the high-sulfur water-producing gas well production dynamic simulation device provided by the present invention is as follows:

[0083] Take the rock sample of the target layer of the high-sulfur water-producing gas well in the research block to make a 50*25mm standard rock column for experiment, and put it into the core holder 12 after drying;

[0084] Fill the first high-pressure transparent drying tube 23 and the second high-pressure transparent drying tube 24 with equal amounts of moisture desiccant, and weigh their respective total masses, where the total mass is specifically the total mass of the high-pressure transparent drying tube and the internal reagents;

[0085] Add sufficient and equal amounts of saturated copper sulfate solution to the first desulfurization bottle 36 and the sixth quick connector 37, respectively, and weigh their respective total masses, where the total mass is specifically the total mass of the desulfurization bottle and the internal reagents;

[0086] The core is evacuated by a vacuum pump, and then the formation water is displaced into the core by nitrogen gas until the liquid outflow from the right end of the core holder 12 is stable and reaches a fully saturated water state, and then the saturated water state of the core is displaced to the water saturation of the target layer in the study area by gas-driven water;

[0087] Open the first pressure regulating valve 2 and the first valve 4, close the second pressure regulating valve 8, then adjust the outlet pressure of the gas cylinder 1 of the sulfur-containing gas through the first pressure regulating valve 2, and pump the configured sulfur-containing gas into the intermediate container 7 by the first constant speed constant pressure pump 3 until the pressure of the gas in the intermediate container 7 reaches the formation pressure of the target layer in the study area;

[0088] Close the first pressure regulating valve 2 and the first valve 4, and set the initial confining pressure of the core using the confining pressure automatic tracking pump 13 according to the conditions of the target layer;

[0089] According to the production pressure difference required by actual production, the second pressure regulating valve 8 is adjusted to control the inlet pressure at the left end of the core holder 12 to be P in , the outlet pressure is P out ;

[0090] The second constant speed constant pressure pump 17 is used to set the pressure of the back pressure valve 16, thereby controlling the pressure at the outlet of the core holder 12, the minimum pressure of which is the exhaust gas pressure P min ;

[0091] The confining pressure automatic tracking pump 13 is used to track the left inlet pressure P of the core holder 12 in real time. in , and then automatically adjust the confining pressure;

[0092] The first high-pressure transparent drying tube 23 is filled with dry nitrogen having the same sulfur content as the source gas until the initial pressure is equal to the pressure P at the outlet of the core holder 12. out Consistency;

[0093] The second high pressure resistant transparent drying tube 24 is filled with dry nitrogen with the same sulfur content until the initial pressure is the same as the pressure P at the outlet of the core holder 12. outi Consistent, P outi The pressure at the outlet of the core holder 12 when the high-pressure transparent drying tube used in the previous stage is replaced, and the replacement time interval of the high-pressure transparent drying tube is implemented according to the set formation pressure dropping to each pressure point;

[0094] After the pressure at both ends of the core holder 12 is stabilized, the second valve 19, the fourth valve 27, the seventh valve 33 and the ninth valve 41 are opened first to connect the first high-pressure transparent drying tube 23 and the first desulfurization bottle 36, and then the second pressure regulating valve 8 is adjusted to start the simulated production, while the pressure of the intermediate container 7, the pressure at both ends of the core holder 12 and the gas flow rate V measured by the gas flow meter 31 are monitored and recorded in real time.(C+S)i ;

[0095] When the formation pressure P drops to the next pressure point, quickly close the second valve 19, the fourth valve 27, the seventh valve 33 and the ninth valve 41, open the third valve 20, the sixth valve 29, the eighth valve 34 and the tenth valve 42, connect the second high-pressure resistant transparent drying tube 24 and the second desulfurization bottle 38, and continue production;

[0096] The second high-pressure resistant transparent drying tube 24 and the first desulfurization bottle 36 are removed, and the mass increment of the second high-pressure resistant transparent drying tube 24 is weighed as m. 1i , converted to volume is That is the water production in this stage. Combined with the gas flow measured by the flow meter, the water and gas production in this stage can be obtained.

[0097] The solid in the first desulfurization bottle 36 is separated and its mass is measured. Then, the H in the gas produced at this stage is calculated according to the following chemical formula: 2 S Quality:

[0098] CuSO 4 +H 2 S=CuS↓+H 2 SO 4

[0099] The amount of solid CuS and H 2 S is equal, the relative atomic mass of Cu is 63.546, the relative atomic mass of S is 32.065, and the relative atomic mass of H is 1.00794, so CuS and H 2 The mass ratio of S is 1:0.356454; therefore, the sulfur content M in the produced gas Si It can be calculated using formula 2, the unit is g / m 3 ;

[0100] Formula 2:

[0101] H produced under standard conditions 2 The volume of S gas is:

[0102]

[0103] Where: H 2 The relative molecular mass of S is 34.08088.

[0104] According to the changes in the set formation pressure points, the high-pressure transparent drying tube and the desulfurization bottle are replaced alternately, and the experiment is continued until the end of the experiment. The water production measured at every two adjacent pressure points is V Wi , Gas production V gi, sulfur content is M Si ;

[0105] The production pressure difference of simulated production is ΔP=PP out , when the formation pressure P is sufficient and greater than P in When the formation pressure P drops to and P in After they are equal, the production enters the decreasing stage. At this time, the formation pressure P and the clamp inlet pressure P in , outlet pressure P out At the same time, the pressure difference ΔP is also decreasing until P out ≤P min When the time comes, production stops.

[0106] Example 2

[0107] like Figure 3 As shown, the present invention provides a method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well, comprising the following steps:

[0108] S1. Obtain the change of formation pressure points;

[0109] S2. According to the change of formation pressure point, the high-sulfur water-producing gas well production dynamic simulation device described in any one of claims 1 to 4 is used to carry out stage production under different formation pressures to obtain the mass of solids in the desulfurization bottle used before and after each stage of production under different formation pressures and the gas flow rate measured by the gas flow meter during each stage of production;

[0110] S3. According to the mass of solids in the desulfurization bottles used before and after the production at each stage under different formation pressures and the gas flow rate measured by the gas flow meter during the production at each stage, the predicted sulfur content in the production gas at each stage under different formation pressures is obtained;

[0111] S4. Accumulate the predicted sulfur content in the production gas at each stage to calculate the final sulfur content;

[0112] S5. According to the final sulfur content, the hydrogen sulfide content of the high-sulfur water-producing gas well is obtained.

[0113] The step S2 is specifically as follows:

[0114] S201, take rock samples from the target layer of the high-sulfur water-producing gas well in the study area, make them into rock columns of standard cores for experiments, dry them and put them into the core holder 12, and fill the first high-pressure transparent drying tube 23 and the second high-pressure transparent drying tube 24 with equal amounts of water desiccant, and add equal amounts of saturated copper sulfate solution to the first desulfurization bottle 36 and the second desulfurization bottle 38 respectively, to complete the operation preparation of the high-sulfur water-producing gas well production dynamic simulation device;

[0115] S202, obtaining the mass of solids in the desulfurization bottles used before stage production according to the first desulfurization bottle 36 and the second desulfurization bottle 38;

[0116] S203, according to the change of formation pressure point, run the high-sulfur water-producing gas well production dynamic simulation device, when the formation pressure P drops to the next pressure point, obtain the mass of the solid in the desulfurization bottle used after the stage production and the gas flow measured by the stage production gas flowmeter 31;

[0117] S204. According to the mass of solids in the desulfurization bottle used before the stage production and the mass of solids in the desulfurization bottle used after the stage production, the mass of solids produced in the desulfurization bottle used in the stage production is obtained, and return to step S202 to enter the next stage.

[0118] The expression for the predicted value of sulfur content in the production gas at each stage in step S3 is:

[0119]

[0120]

[0121] Among them, M Si is the predicted sulfur content in the i-th stage; V Si is the hydrogen sulfide H produced under standard conditions in stage i 2 S is the volume of the gas; V is the volume of the gas (C+S)i is the gas flow rate measured by the gas flow meter 31 in the i-th stage; m 2j is the mass of solids produced in the desulfurization bottle used in stage i; H 2 The relative molecular mass of S is 34.08088; i is the stage number.

[0122] The expression of the final sulfur content in step S4 is:

[0123]

[0124] in, is the final sulfur content; n is the total number of stages; M S(i-1) is the predicted sulfur content of the i-1th stage; i is the stage number.

[0125] In this embodiment, the sulfur content in the configured experimental gas is fixed. 2 S will react with CuSO 4 If the solution is fully reacted and the sulfur deposition and dissolution caused by the test process are not considered, the sulfur content measured at each pressure stage should be the same in theory. Therefore, in order to improve the accuracy of the sulfur content test, the final sulfur content measured is taken as the average value of the results measured at each stage.

[0126] The expression of hydrogen sulfide content in step S5 is:

[0127]

[0128] in, is the hydrogen sulfide content; is the final sulfur content.

[0129] Taking a high-sulfur water-producing gas well as an example, the changes of formation pressure, bottom hole flowing pressure and production pressure difference over time are shown in Figure 2. Figure 4 shown.

[0130] The method for determining hydrogen sulfide content in a high-sulfur water-producing gas well provided by an embodiment of the present invention is used, and the high-sulfur water-producing gas well production dynamic simulation device provided by an embodiment of the present invention is used to perform stage production under different formation pressures to obtain the gas production per second and the cumulative gas production during the production process, as well as the cumulative water production during the production process. Figure 5 and Figure 6 shown.

[0131] based on Figure 5 and Figure 6 The test data was used to calculate the hydrogen sulfide content of high-sulfur water-producing gas wells and draw a graph. The results are shown in Figure 7.

[0132] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dynamic simulation device for high-sulfur water-producing gas well production, characterized in that: include: Production simulation module, water production metering module and sulfur content measurement module; The production simulation module is used to simulate the production of a high-sulfur water-producing gas well, obtain simulated formation pressure values ​​and pressure values ​​at the inlet and outlet ends of the core to be tested, and generate wetted produced gas; The water production metering module is used to dry the wet output gas produced by the production simulation module to obtain the output water volume and the dry output gas; The sulfur content measurement module is used to desulfurize the dry output gas generated by the water production metering module, and calculate the sulfur content based on multiple groups of pressure value data and the dry output gas.

2. The high-sulfur water-producing gas well production dynamic simulation device according to claim 1 is characterized in that: The production simulation module includes: a gas cylinder, a first constant speed and constant pressure pump, a core holder, and a back pressure valve connected in sequence; A first pressure regulating valve is provided between the gas cylinder and the first constant speed and constant pressure pump, and a second pressure regulating valve is provided between the first constant speed and constant pressure pump and the inlet end of the core holder; An intermediate container and a first pressure sensor are respectively connected between the first constant speed and constant pressure pump and the second pressure regulating valve via a joint; a confining pressure automatic tracking pump and a second pressure sensor are respectively connected between the second pressure regulating valve and the inlet end of the core clamp via a joint; the confining pressure automatic tracking pump is also connected to the core clamp, and a pressure gauge is provided on the core clamp; a third pressure sensor is connected between the outlet end of the core clamp and the back pressure valve via a joint; the back pressure valve is also connected to the second confining pressure automatic tracking pump.

3. The high-sulfur water-producing gas well production dynamic simulation device according to claim 1 is characterized in that: The water production metering module includes: a plurality of water production metering components and a gas flow meter, wherein the inlet ends of the plurality of water production metering components are connected in parallel to the production simulation module through joints, and the outlet ends of the plurality of water production metering components are connected in parallel to the gas flow meter through joints; The water production metering component includes: a high-pressure resistant transparent drying tube.

4. The high-sulfur water-producing gas well production dynamic simulation device according to claim 1 is characterized in that: The sulfur content measurement module includes: multiple groups of desulfurization components, waste gas recovery tanks and data acquisition terminals, the inlet ends of the multiple groups of desulfurization components are connected in parallel to the water production metering module through joints, and the outlet ends of the multiple groups of desulfurization components are connected in parallel to the waste gas recovery tank and the data acquisition terminal through joints, respectively, and the data acquisition terminal is also connected to the production simulation module and the water production metering module; The desulfurization component comprises: a desulfurization bottle.

5. A method for determining the content of hydrogen sulfide produced in a high-sulfur water-producing gas well, characterized in that: include: Obtain changes in formation pressure points; According to the change of formation pressure point, the high-sulfur water-producing gas well production dynamic simulation device described in any one of claims 1 to 4 is used to carry out stage production under different formation pressures to obtain the mass of solids in the desulfurization bottle used before and after each stage of production under different formation pressures and the gas flow rate measured by the gas flow meter during each stage of production; According to the mass of solids in the desulfurization bottles used before and after production at each stage under different formation pressures and the gas flow rate measured by the gas flow meter during production at each stage, the predicted value of sulfur content in the production gas at each stage under different formation pressures is obtained; The predicted sulfur content in the produced gas at each stage is accumulated to calculate the final sulfur content; According to the final sulfur content, the hydrogen sulfide content of the high-sulfur water-producing gas well is obtained.

6. The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well according to claim 5, characterized in that: The mass of solids in the desulfurization bottles used before and after production at each stage under different formation pressures and the gas flow rate measured by the gas flow meter during production at each stage include: Complete the operation preparation of the high-sulfur water-producing gas well production dynamic simulation device, and obtain the mass of the solid in the desulfurization bottle used before the stage production; According to the change of formation pressure point, the high-sulfur water-producing gas well production dynamic simulation device is operated, and when the formation pressure drops to the next pressure point, the mass of the solid in the desulfurization bottle used after the stage production at the pressure point and the gas flow measured by the stage production gas flowmeter are obtained; By changing the formation pressure, the mass of solids in the desulfurization bottle used before and after each stage of production under different formation pressures and the gas flow measured by the gas flow meter during each stage of production are obtained.

7. The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well according to claim 5, characterized in that: The expression for the predicted sulfur content in the produced gas at each stage under different formation pressures is: Among them, M Si is the predicted sulfur content in the i-th stage; V Si V is the volume of hydrogen sulfide H2S gas produced under standard conditions in the i-th stage; (C+S)i It is the gas flow measured by the gas flow meter in the i-th stage; i is the stage number.

8. The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well according to claim 1, characterized in that: The expression for the volume of hydrogen sulfide H2S gas produced under standard conditions in the i-th stage is: V Si The expression is: Among them, m 2j is the mass of solids produced in the desulfurization bottle used in stage i; is the relative molecular mass of H2S, which is 34.08088; i is the stage number.

9. The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well according to claim 5, characterized in that: The expression for the final sulfur content and the hydrogen sulfide content of high-sulfur water-producing gas wells is: in, is the final sulfur content; n is the total number of stages; M S(i-1) is the predicted sulfur content of the i-1th stage; i is the stage number.

10. The method for determining the hydrogen sulfide content in a high-sulfur water-producing gas well according to claim 5, characterized in that: The expression of hydrogen sulfide content in high-sulfur water-producing gas wells is: in, is the hydrogen sulfide content; is the final sulfur content.

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