Device and method for evaluating oil and gas production from shale

Abstract

The present invention discloses an oil and gas production evaluation device and an oil and gas production evaluation method for shale, relating to the field of shale oil and gas resource evaluation. The oil and gas production evaluation device includes: a heating assembly, within which a heating chamber is formed; a centrifugal assembly rotatably arranged within the heating chamber, with a limiting groove formed on the centrifugal assembly; a reaction assembly arranged within the limiting groove, within which a reaction chamber, an air inlet channel and an air outlet channel communicating with the reaction chamber are formed; a clamping assembly arranged within the reaction chamber and having a fixing chamber formed inside, the fixing chamber being adapted to accommodate a core, and the clamping assembly having an air inlet hole and an air outlet hole communicating with the fixing chamber, the air inlet hole communicating with the air inlet channel, and the air outlet hole communicating with the air outlet channel. According to the oil and gas production evaluation device of the embodiments of the present invention, the oil and gas production evaluation device can improve the quantitative evaluation accuracy and contribute to the precise exploration and efficient development of shale oil.

Description

Technical Field

[0001] The present invention relates to the field of shale oil and gas resource evaluation, and particularly to an oil and gas production evaluation device and an oil and gas production evaluation method for shale. Background Art

[0002] In related technologies, shale oil, as an important unconventional oil resource, is mainly divided into two types: medium-low maturity shale oil and medium-high maturity shale oil. Medium-low maturity shale oil is mainly composed of untransformed solid organic matter and needs to be heated to 300-600 °C to be transformed into oil and gas products, while medium-high maturity shale oil is mainly composed of liquid oil. Due to the complex geological characteristics and physicochemical properties of shale and the interaction with the stored hydrocarbons, only part of the primary hydrocarbons and secondary hydrocarbons generated by pyrolysis existing in the core can be produced, which is the movable oil resource volume, and the rest cannot be produced, which is the immovable oil resource volume. At present, the accurate evaluation of the movable oil resource volume inside shale under different environments is one of the urgent challenges faced by shale oil exploration and exploitation.

[0003] Currently, there is a lack of evaluation devices specifically for the production of movable oil and hydrocarbon gas in shale, and the existing similar devices have single functions and cannot meet the accurate quantitative evaluation under in-situ conditions, which restricts the accurate exploration and efficient development of shale oil. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide an oil and gas production evaluation device for shale, which can improve the accuracy of quantitative evaluation and contribute to the accurate exploration and efficient development of shale oil.

[0005] The present invention also provides an oil and gas production evaluation method applied to the above-mentioned oil and gas production evaluation device.

[0006] The oil and gas production evaluation device for shale according to an embodiment of the present invention includes: a heating assembly, a heating chamber is formed inside the heating assembly; a centrifugal assembly, the centrifugal assembly is rotatably arranged inside the heating chamber, and a limiting groove is formed on the centrifugal assembly; a reaction assembly, the reaction assembly is arranged inside the limiting groove, and a reaction chamber is formed inside the reaction assembly, and an air inlet channel and an air outlet channel communicating with the reaction chamber are formed on the reaction assembly; a clamping assembly, the clamping assembly is arranged inside the reaction chamber and a fixing chamber is formed inside the clamping assembly, the fixing chamber is adapted to accommodate a core, and an air inlet hole and an air outlet hole communicating with the fixing chamber are formed on the clamping assembly, the air inlet hole communicates with the air inlet channel, and the air outlet hole communicates with the air outlet channel.

[0007] An oil and gas production evaluation device for shale according to an embodiment of the present invention. The oil and gas production evaluation device is provided with a heating component, a centrifugal component, a reaction component, and a clamping component. The clamping component can be used to fix the core. The reaction component can pressurize the reaction chamber to simulate the pressure of shale underground. The heating component can heat the core. The centrifugal component can discharge the oil and gas in the core into the reaction chamber. The reaction component can collect the oil and gas through the gas outlet channel for measuring the oil and gas, so as to calculate the content of movable oil and hydrocarbon gas in shale more accurately, be closer to the real data in actual production, and the measurement process has higher accuracy and reliability.

[0008] In some embodiments of the present invention, the reaction component includes: a first housing disposed in the limiting groove. A fixing member is provided in the first housing. A fixed end is formed on one side of the fixing member along a first direction, and the fixed end is in limiting cooperation with one end of the clamping component along the first direction. A second housing is disposed on one side of the first housing along the first direction and is hermetically connected to the first housing. An intake channel and an outlet channel are formed on the second housing. An elastic member connected to the other end of the clamping component along the first direction is formed on the inner wall of the second housing.

[0009] In some embodiments of the present invention, a baffle is provided on the side of the second housing facing the clamping component, and the free end of the baffle is connected to the fixing member. Wherein, a reaction chamber is formed between the baffle, the fixing member, and the second housing.

[0010] In some embodiments of the present invention, an intake cavity is formed between the outer wall of the baffle and the inner wall of the first housing. The fixing member is formed with a ventilation channel, a first through hole, and a second through hole communicating with the ventilation channel. The first through hole communicates with the intake cavity, and the second through hole is correspondingly arranged with the intake hole.

[0011] In some embodiments of the present invention, the clamping component includes: a bottom plate disposed on the fixing member and in limiting cooperation with the fixed end. Part of the bottom plate is correspondingly arranged with the second through hole, and an intake hole is formed on the bottom plate. A side plate is disposed on the side of the bottom plate away from the fixing member and extends along the first direction. An air outlet hole is formed on the side plate. A top plate is disposed at the free end of the side plate and cooperates with the side plate. The top plate is connected to the elastic member. Wherein, the bottom plate, the side plate, and the top plate define the fixing cavity.

[0012] In some embodiments of the present invention, the oil and gas production evaluation device further includes: a sealing member, which is received in the reaction chamber and disposed around the outer peripheral wall of the side plate. Along the first direction, one end of the sealing member abuts against the fixed end, and the other end of the sealing member abuts against the top plate.

[0013] In some embodiments of the present invention, the centrifugal assembly includes: a centrifugal generator, which is disposed on the heating assembly; a rotating shaft, which is power-connected to the centrifugal generator; a housing, the bottom end of the housing is connected to the free end of the rotating shaft, and the limiting groove is formed on the housing; a flip cover, which is movably disposed on the housing and is adapted to fix the reaction assembly in the limiting groove.

[0014] In some embodiments of the present invention, there are a plurality of the housings, the bottom ends of the plurality of housings are all connected to the rotating shaft, and the plurality of housings are symmetrically arranged along the axis of the rotating shaft.

[0015] In some embodiments of the present invention, the heating assembly includes: a base, an installation groove adapted to install the centrifugal generator is provided at the top end of the base; a heating element, which is disposed at the top end of the base and extends along the first direction; a top cover, which is disposed at the free end of the heating element; wherein, the base, the heating element and the top cover define the heating chamber.

[0016] The oil and gas production evaluation method for shale according to the embodiments of the present invention will be described below.

[0017] According to the oil and gas production evaluation method for shale according to the embodiments of the present invention, the oil and gas production evaluation method is applied to the above-mentioned oil and gas production evaluation device, and the oil and gas production evaluation method includes: controlling the reaction assembly to make the reaction chamber reach a simulated environment, the simulated environment includes that the reaction chamber is filled with an inert gas and the reaction chamber reaches a preset pressure; controlling the heating assembly to heat the reaction chamber and continue for a first preset time; controlling the centrifugal assembly to centrifuge the core and continue for a second preset time; controlling the reaction assembly to open the intake channel and the exhaust channel to collect the oil and gas products in the reaction chamber.

[0018] According to the oil and gas production evaluation method for shale according to the embodiments of the present invention, since the oil and gas production evaluation method is applied to the oil and gas production evaluation device of the above embodiment, the oil and gas production evaluation method can calculate the content of movable oil and hydrocarbon gas in shale more accurately, be closer to the real data in actual production, and the measurement process has higher accuracy and reliability.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of an oil and gas production evaluation device for shale according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1 a schematic structural diagram of the reaction component and the clamping component in ;

[0023] Figure 3 is Figure 2 a schematic structural diagram of the reaction component and the clamping component after filling with a columnar core in ;

[0024] Figure 4 is Figure 2 a schematic structural diagram of the reaction component and the clamping component after filling with a blocky core in ;

[0025] Figure 5 is Figure 3 a schematic diagram of the gas flow direction after injecting an inert gas into the reaction component and the clamping component in ;

[0026] Figure 6 is a schematic structural diagram of an oil and gas production evaluation device filled with multiple cores according to an embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of an oil and gas production evaluation device filled with a core and a counterweight according to an embodiment of the present invention;

[0028] Figure 8 is a schematic flow diagram of an oil and gas production evaluation method for shale according to an embodiment of the present invention.

[0029] Reference Numerals:

[0030] 10. Oil and gas production evaluation device;

[0031] 11. Heating component; 111. Heating cavity; 112. Base; 1121. Installation groove; 113. Heating element; 114. Top cover;

[0032] 12. Centrifugal component; 121. Centrifugal generator; 122. Rotating shaft; 123. Outer shell; 1231. Limiting groove; 124. Flip cover; 125. Spring hinge;

[0033] 13. Reaction component; 131. Reaction chamber; 132. Intake channel; 1321. First control valve; 133. Exhaust channel; 1331. Second control valve; 134. First housing; 135. Second housing; 1351. Baffle; 136. Fixing member; 1361. Fixed end; 1362. Ventilation channel; 1363. First through hole; 1364. Second through hole; 137. Elastic member; 138. Intake chamber;

[0034] 14. Clamping component; 141. Fixed cavity; 142. Bottom plate; 1421. Intake hole; 143. Side plate; 1431. Exhaust hole; 144. Top plate;

[0035] 15. Sealing member; 16. Control member; 20. Core; 30. Counterweight. Detailed implementation manner

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0037] Next, refer to Figures 1 - 7 Describe an oil and gas production evaluation device 10 for shale according to an embodiment of the present invention. The oil and gas production evaluation device 10 includes a heating component 11, a centrifugal component 12, a reaction component 13, and a clamping component 14.

[0038] A heating chamber 111 is formed in the heating component 11. The centrifugal component 12 is rotatably disposed in the heating chamber 111, and a limiting groove 1231 is formed on the centrifugal component 12. The reaction component 13 is disposed in the limiting groove 1231, and a reaction chamber 131 is formed in the reaction component 13. An intake channel 132 and an exhaust channel 133 communicating with the reaction chamber 131 are formed on the reaction component 13. The clamping component 14 is disposed in the reaction chamber 131, and a fixed cavity 141 is formed inside the clamping component 14. The fixed cavity 141 is adapted to accommodate the core 20. An intake hole 1421 and an exhaust hole 1431 communicating with the fixed cavity 141 are formed on the clamping component 14. The intake hole 1421 is communicated with the intake channel 132, and the exhaust hole 1431 is communicated with the exhaust channel 133.

[0039] Currently, there is a lack of evaluation devices for movable oil and hydrocarbon gas production in shale, and existing similar devices have a single function and cannot meet the accurate quantitative evaluation under in-situ conditions, which restricts the accurate exploration and efficient development of shale oil.

[0040] Such as Figure 1 and Figure 2As shown, specifically, the oil and gas production evaluation device 10 may include a heating component 11, a centrifugal component 12, a reaction component 13 and a clamping component 14. A heating chamber 111 may be formed in the heating component 11. The heating component 11 may play a heating role, so that the temperature in the heating chamber 111 reaches a desired temperature, and the heating component 11 may also adjust the temperature to achieve heating or constant temperature, etc., to meet actual measurement requirements. The centrifugal component 12 may be arranged in the heating chamber 111, and the centrifugal component 12 may rotate in the heating chamber 111 to achieve a centrifugal effect, and a limiting groove 1231 may be formed on the centrifugal component 12.

[0041] The reaction component 13 can be arranged in the limiting groove 1231. Optionally, the reaction component 13 and the limiting groove 1231 are detachably connected by screws or bolts, or the reaction component 13 and the limiting groove 1231 are detachably connected by snapping or plugging. A reaction chamber 131 can be formed in the reaction component 13. An air inlet channel 132 and an air outlet channel 133 are also formed on the reaction component 13. The air inlet channel 132 and the air outlet channel 133 can be connected to the reaction chamber 131. A first control valve 1321 can be arranged at the air inlet channel 132, and a second control valve 1331 can be arranged at the air outlet channel 133. The first control valve 1321 and the second control valve 1331 can control the air flow of the air inlet channel 132 and the air outlet channel 133 respectively. In some embodiments, the number of the air inlet channels 132 can be multiple, and the multiple air inlet channels 132 can be symmetrically distributed with the air outlet channel 133 as the center.

[0042] Further, the clamping assembly 14 can be arranged in the reaction chamber 131, and a fixed cavity 141 can be formed inside the clamping assembly 14, and the fixed cavity 141 can be used to accommodate the core 20, and the core 20 can be a shale sample, and the core 20 can be columnar or block-shaped, and an air inlet 1421 and an air outlet 1431 can be formed on the clamping assembly 14, and the air inlet 1421 and the air outlet 1431 can be communicated with the fixed cavity 141 respectively, and the air inlet 1421 can be communicated with the air inlet channel 132, and the air outlet 1431 can be communicated with the air outlet channel 133, as shown in FIG. Figure 3 and Figure 5 As shown, when the inert gas is guided to the inlet hole 1421 through the inlet channel 132, it enters the core 20 in the fixed cavity 141 through the inlet hole 1421, and then is guided from the inside of the core 20 to the outlet hole 1431, and finally is guided from the outlet hole 1431 to the outlet channel 133 and discharged.

[0043] It should be noted that the reaction component 13 can introduce a certain flow of inert gas such as nitrogen or carbon dioxide into the reaction chamber 131 through the intake channel 132 to discharge the oxygen in the reaction chamber 131, so as to avoid affecting the evaluation results. The reaction component 13 can also increase the air pressure in the reaction chamber 131 by continuously injecting inert gas to simulate the pressure of shale underground. The heating component 11 can heat the core 20 in the reaction chamber 131 to cause the organic matter inside the core to pyrolyze to produce oil and gas, and gasify the produced movable oil and hydrocarbon gas. The centrifugal component 12 discharges the oil and gas inside the core 20 into the reaction chamber 131 through centrifugal action, so as to facilitate the staff to collect the oil and gas, thereby more accurately measuring the content of movable oil and hydrocarbon gas in the core 20, judging whether the shale oil here meets the development conditions, improving the quantitative evaluation accuracy, promoting the precise exploration and efficient development of shale oil. The oil and gas production evaluation device 10 is applicable to the determination of movable oil and hydrocarbon gas in various unconventional oil and gas resources such as medium-low maturity shale oil, medium-high maturity shale oil, shale gas, tight oil, oil shale and oil-rich coal. It has a wide application range, and can realize the on-demand adjustment and automatic control of pyrolysis temperature, ambient pressure, centrifugal speed, experimental time and sample quantity. Moreover, it can carry out simulation tests under various inert atmosphere environments and different mining processes, with comprehensive functions and strong practicability.

[0044] In short, the oil and gas production evaluation device 10 of the embodiment of the present invention is provided with a heating component 11, a centrifugal component 12, a reaction component 13 and a clamping component 14. The clamping component 14 can be used to fix the core 20. The reaction component 13 can pressurize the reaction chamber 131 to simulate the pressure of shale underground. The heating component 11 can heat the core 20. The centrifugal component 12 can discharge the oil and gas in the core 20 into the reaction chamber 131. The reaction component 13 can collect the oil and gas through the air outlet channel 133 to facilitate the measurement of the oil and gas, so as to more accurately calculate the content of movable oil and hydrocarbon gas in the shale, be closer to the real data in actual production, and the measurement process has higher accuracy and reliability.

[0045] Such as Figures 2 to 4As shown, in some embodiments of the present invention, the reaction assembly 13 may include a first housing 134 and a second housing 135. The first housing 134 may be disposed in the limiting groove 1231, and a fixing member 136 may be disposed inside the first housing 134. The fixing member 136 may be in contact with the inner wall of the first housing 134 to fix the fixing member 136. Optionally, there may be an interference fit between the fixing member 136 and the inner wall of the first housing 134. A fixing end 1361 may be formed on one side of the fixing member 136 along the first direction. The fixing end 1361 may be used to fix the clamping assembly 14. Specifically, the fixing end 1361 is in limit fit with one end of the clamping assembly 14 along the first direction. The second housing 135 may be disposed on one side of the first housing 134 along the first direction, and the second housing 135 can be hermetically connected to the first housing 134.

[0046] In some embodiments, an extension portion extending towards the first housing 134 is formed on the second housing 135. The extension portion may extend into the first housing 134 and cooperate with the inner wall of the first housing 134. Optionally, the extension portion and the first housing 134 may be connected by threads, or a sealing member is provided between the extension portion and the first housing 134, and the extension portion and the first housing 134 are in interference fit. An air inlet channel 132 and an air outlet channel 133 may be formed on the second housing 135. The air inlet channel 132 and the air outlet channel 133 may be disposed through the second housing 135 along the first direction. An elastic member 137 may be disposed on the inner wall of the second housing 135. The elastic member 137 can be connected to the other end of the clamping assembly 14 along the first direction. The elastic member 137 can apply a thrust force towards the fixing member to fix the clamping assembly 14 at the fixing end 1361. It can be understood that the fixing end 1361 and the elastic member 137 can respectively fix the two ends of the clamping assembly 14 along the first direction, thereby improving the stability of the clamping assembly 14.

[0047] As Figure 1 and Figure 2 shown, in some embodiments of the present invention, a baffle 1351 may be disposed on the side of the second housing 135 facing the clamping assembly 14. The baffle 1351 can extend towards the fixing member 136, and the free end of the baffle 1351 can be connected to the fixing member 136. Among them, a reaction chamber 131 may be formed between the baffle 1351, the fixing member 136 and the second housing 135. The baffle 1351 may be located on the outer periphery of the clamping assembly 14. When the centrifugal assembly 12 works, the oil and gas in the core 20 are guided to the baffle 1351 under the influence of centrifugal force, ensuring that the oil and gas can be discharged after the subsequent air outlet channel 133 is opened. In some working conditions, part of the oil and gas will liquefy and adhere to the baffle 1351 and the sealing member 15 for subsequent collection.

[0048] As Figure 3and Figure 5 As shown, in some embodiments of the present invention, an intake cavity 138 may be formed between the outer wall of the baffle 1351 and the inner wall of the first housing 134. The intake cavity 138 can communicate with the intake passage 132. A ventilation passage 1362, a first through hole 1363 and a second through hole 1364 communicating with the ventilation passage 1362 may be formed on the fixing member 136. The first through hole 1363 can be directly opposite to and communicate with the intake cavity 138, and the second through hole 1364 can be correspondingly arranged and communicate with the intake hole 1421. Under actual working conditions, the inert gas can enter the intake cavity 138 through the intake passage 132, be guided into the ventilation passage 1362 through the first through hole 1363, and then be guided to the intake hole 1421 through the second through hole 1364. Therefore, the fixing member 136 can play a role in limiting the clamping assembly 14 and guiding the gas. The fixing member 136 and the baffle 1351 can also separate the intake cavity 138 from the reaction cavity 131, which helps to collect and measure the oil and gas.

[0049] As Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the clamping assembly 14 may include a bottom plate 142, side plates 143 and a top plate 144. The bottom plate 142 can be arranged on the fixing member 136, and the bottom plate 142 can be in limiting cooperation with the fixed end 1361. Optionally, there may be an interference fit between the outer peripheral wall of the bottom plate 142 and the fixed end 1361. A part of the bottom plate 142 can be correspondingly arranged with the second through hole 1364, and an intake hole 1421 may be formed on the bottom plate 142. The number of the intake holes 1421 can be multiple, and the multiple intake holes 1421 can be arranged at intervals on the bottom plate 142. The side plates 143 can be arranged on the side of the bottom plate 142 away from the fixing member 136, and the side plates 143 can extend along the first direction. The side plates 143 can be formed with air outlet holes 1431. The number of the air outlet holes 1431 can be multiple, and the multiple air outlet holes 1431 can be arranged at intervals on the side plates 143. The top plate 144 can be arranged at the free end of the side plates 143, and the top plate 144 can cooperate with the side plates 143.

[0050] Optionally, the top plate 144 and the side plates 143 can be connected by threads, or there may be an interference fit between the top plate 144 and the side plates 143. The side away from the side plates 143 of the top plate 144 can be connected to the elastic member 137. During actual operation, the top plate 144 can be first disassembled from the side plates 143, and then the core 20 can be placed in the fixing cavity 141, and then the top plate 144 and the side plates 143 can be connected, so as to realize the limitation of the core 20. Among them, a fixing cavity 141 can be defined between the bottom plate 142, the side plates 143 and the top plate 144.

[0051] As Figure 2 and Figure 3As shown, in some embodiments of the present invention, the oil and gas production evaluation device 10 may include a sealing member 15. The sealing member 15 can be accommodated in the reaction chamber 131 and can be disposed around the outer peripheral wall of the side plate 143. Along the first direction, one end of the sealing member 15 can abut against the fixed end 1361, and the other end of the sealing member 15 can abut against the top plate 144, ensuring that the sealing member 15 can completely cover the air outlet 1431. Specifically, the sealing member 15 can be configured as a sealing net with extremely small pore diameters. Therefore, the sealing member 15 can allow oil and gas to pass through and block the core 20 debris from passing through. When the centrifuge assembly 12 centrifuges the core 20, the oil and gas in the core 20 can be exported through the air outlet 1431 and the sealing member 15, and the core 20 debris can be blocked by the sealing member 15 in the fixed chamber 141, which helps to measure the weight of the core 20 debris and improves the accuracy and reliability of the measurement.

[0052] As Figure 1 shown, in some embodiments of the present invention, the centrifuge assembly 12 may include a centrifuge generator 121, a rotating shaft 122, a housing 123, and a flip cover 124. The centrifuge generator 121 can be disposed on the heating assembly 11 and can serve as a driving device, such as an electric motor used in a traditional centrifuge or a vibrator used in a vibrating screen. The rotating shaft 122 can be power-connected to the centrifuge generator 121, and the centrifuge generator 121 can drive the rotating shaft 122 to rotate. The housing 123 can be connected to the free end of the rotating shaft 122. When the rotating shaft 122 rotates, the housing 123 can rotate synchronously with the rotating shaft 122, and a limiting groove 1231 can be formed on the housing 123. The flip cover 124 can be movably disposed on the housing 123 and can be used to fix the reaction assembly 13 in the limiting groove 1231. Optionally, the flip cover 124 and the housing 123 can be connected by a spring hinge 125, and the flip cover 124 can limit the reaction assembly 13 in the first direction by rotation. The oil and gas production evaluation device 10 may further include a control member 16. The control member 16 can be disposed at the centrifuge generator 121 and is used to control the centrifuge assembly 12 and the heating assembly 11 to achieve functions such as programmed temperature rise, constant temperature, different rotation speeds, and centrifugation time.

[0053] As Figure 6 and Figure 7As shown, in some embodiments of the present invention, the number of the outer shells 123 can be multiple. The bottoms of the multiple outer shells 123 can all be connected to the rotating shaft 122, and the multiple outer shells 123 can be symmetrically arranged along the axis of the rotating shaft 122, so as to ensure that the center of gravity of the multiple outer shells 123 is located at the center of gravity of the rotating shaft 122, ensuring the stability of the multiple outer shells 123 during the centrifugation process. Moreover, using multiple outer shells 123 can be used to test multiple cores 20, improving the measurement accuracy. When the number of cores 20 to be measured is less than the number of outer shells 123, the redundant outer shells 123 can add counterweight blocks 30 into the fixed cavity 141 to balance the weight. The counterweight blocks 30 can be special cylinders with adjustable mass and an outer diameter and height matching the fixed cavity 141.

[0054] As Figure 1 As shown, in some embodiments of the present invention, the heating assembly 11 can include a base 112, a heating element 113, and a top cover 114. An installation groove 1121 can be formed at the top end of the base 112, and the installation groove 1121 can be used to install the centrifugal generator 121 to realize the limitation of the centrifugal generator 121. The heating element 113 can be arranged at the top end of the base 112, and the heating element 113 can extend along the first direction. In some embodiments, the heating element 113 can be selected as a heating coil to heat the central area. The top cover 114 can be arranged at the free end of the heating element 113, and the top cover 114 is detachably connected to the heating element 113 to facilitate the insertion or removal of the reaction assembly 13. Among them, the base 112, the heating element 113, and the top cover 114 define a heating cavity 111.

[0055] The oil and gas production evaluation method of the embodiments of the present invention will be described below.

[0056] As Figure 8 As shown, the oil and gas production evaluation method for shale according to the embodiments of the present invention is applied to the oil and gas production evaluation device of the above embodiments. The oil and gas production evaluation method includes:

[0057] S1. Control the reaction component to make the reaction chamber reach the simulated environment, where the simulated environment includes that the reaction chamber is filled with inert gas and the reaction chamber reaches the preset pressure. First, weigh a core of a specific size. The initial mass of the core can be recorded as M0. Then place the core in the fixed chamber. After tightening the top plate, wind the sealing element around the outer periphery of the side plate and place it in the reaction chamber. After installing the elastic element, tighten the second housing with the first housing. Then place the reaction component in the limiting groove and fix it. Then inject inert gas into the reaction chamber through the air inlet channel. The inert gas passes through the air inlet channel, the air inlet chamber, the first through hole, the ventilation channel, the second through hole and the air inlet hole in sequence and enters the core, purging the core evenly and stably. Then it passes through the air outlet hole through the sealing element and enters another part of the reaction chamber. It should be noted that during the gas injection process, the change of the internal gas pressure in the reaction chamber should be detected in real time until the internal pressure of the reaction chamber reaches the preset pressure P0, and P0 satisfies the relationship: 0 < P0 ≤ 30 MPa, so as to simulate the pressure environment of the core underground.

[0058] S2. Control the heating component to heat the reaction chamber and last for the first preset time. After the preset pressure P0 is reached in the reaction chamber, turn on the heating component to heat the core to the preset temperature T0 at a specific heating rate. Then maintain the core at the preset temperature T0 and last for the first preset time t1 to ensure that the core can react fully. During this process, the second control valve can be used to control the opening of the air outlet channel to release some gas to adjust the internal air pressure of the reaction chamber and make it stable at the preset pressure P0. Among them, the preset temperature T0 satisfies the relationship: 30°C ≤ T0 ≤ 600°C, and the first preset time t1 satisfies the relationship: 0 < t1 ≤ 10 h.

[0059] S3. Control the centrifugal component to centrifuge the core and last for the second preset time. After the heating component lasts for the first preset time t1, turn on the centrifugal component and set the preset rotation speed r0 and the second preset time t2 to make the movable oil inside the core be thrown out and be thrown towards the baffle through the air outlet hole and the sealing element. Due to the blockage of the sealing element, the core is still bound in the fixed chamber. Among them, the preset rotation speed r0 satisfies the relationship: 0 < r0 ≤ 10000 r / min, and the second preset time t2 satisfies the relationship: 0 < t2 ≤ 2 h.

[0060] S4. Control the reaction assembly to open the intake channel and the outlet channel to collect the oil and gas products in the reaction chamber. After the centrifugal assembly has been running for the second preset time t2, control the second control valve to open the outlet channel, and externally cool and collect the oil and gas in real time. After the pressure is released, control the first control valve to open the intake channel and introduce an inert gas such as nitrogen or carbon dioxide with a certain flow rate through the intake channel to purge the core and the oil and gas products inside the reaction chamber, so that they are released from the outlet channel to the greatest extent. Record the mass of the collected oil as m1 and the mass of the water as m2. After purging for the third preset time t3, stop injecting gas and turn off the heating assembly. The third preset time satisfies the relationship: 0.5 ≤ t3 ≤ 1 h. After cooling to room temperature, take out the core and weigh it again, record the mass as M1. At the same time, collect the residual oil inside the packer and the reaction chamber with an organic solvent and weigh it and record it as m3. The calculation methods for the mass and proportion of each product in the shale are as follows: the amount of movable oil produced: m1 + m3; the proportion of movable oil produced: (m1 + m3) / M0; the amount of shale gas produced: M0 - M1 - m1 - m2 - m3; the proportion of shale gas produced: (M0 - M1 - m1 - m2 - m3) / M0.

[0061] According to the oil and gas production evaluation method for shale in the embodiments of the present invention, since the oil and gas production evaluation method is applied to the oil and gas production evaluation device in the above embodiments, the oil and gas production evaluation method can more accurately calculate the content of movable oil and hydrocarbon gas in the shale, be closer to the real data in actual production, and the measurement process has higher accuracy and reliability.

[0062] In the first embodiment of the present invention, the sample is medium-low maturity shale, in the shape of a column, with an initial mass M0 of 100 g, the number of outer shells is one, the reaction chamber is filled with columnar cores, the nitrogen injection heating process is adopted, the preset pressure P0 is 10 MPa, the preset temperature T0 is 350 °C, the heating rate is 10 °C / min, the first preset time t1 is 2 h, the preset rotation speed r0 is 2500 r / min, the second preset time t2 is 1 h, and the third preset time t3 is 30 min.

[0063] Before use, weigh a single cylindrical core, with an initial mass of 100 g. Then place the core in the fixed cavity. After tightening the top plate, wrap the sealing element around the outer periphery of the side plate and place it in the reaction cavity. After installing the elastic element, tighten the second housing with the first housing. Then place the reaction assembly in the limiting groove and fix it. Next, inject nitrogen into the reaction cavity through the air inlet channel. During the injection process, the internal gas pressure change of the reaction cavity should be detected in real time until the internal pressure of the reaction cavity reaches the preset pressure of 10 MPa. Then turn on the heating assembly and heat the core to the preset temperature of 350 °C at a heating rate of 10 °C / min. Then maintain the core at the preset temperature of 350 °C for the first preset time of 2 h to allow the core to fully react. During this process, the internal air pressure of the reaction cavity can be adjusted and stabilized at the preset pressure of 10 MPa by controlling the opening of the air outlet channel through the second control valve to release some gas.

[0064] After the heating assembly has been operating for 2 h, remove the injection pipeline, close the top cover, and set the preset rotation speed to 2500 r / min. After the second preset time of 1 h, turn on the centrifugal assembly to eject the movable oil inside the core, and it will be ejected towards the baffle through the air outlet hole and the sealing element.

[0065] After the centrifugal assembly has been operating for 1 h, open the air outlet valve to release the oil and gas, and perform real-time cooling and collection on the outside. After the pressure release is complete, control the first control valve to open the air inlet channel and introduce a certain flow rate of nitrogen through the air inlet channel to purge the core and the oil and gas products inside the reaction cavity, so that they are released from the air outlet valve to the greatest extent. Record the mass of the collected oil as m1 (m1 = 3.82 g), the mass of the water as m2 (m2 = 1.05 g). After purging for 30 min, stop the injection of gas, turn off the heating assembly. After the device has cooled to room temperature, take out the core and weigh it again, and record the mass as M1 (M1 = 92.28 g). At the same time, collect the residual oil inside the sealing element and the reaction cavity with an organic solvent and weigh it and record it as m3 (m3 = 0.94 g). Finally, clean the entire device for the next use.

[0066] The calculation method for the mass and proportion of each product in the shale after the experiment is as follows: The amount of movable oil produced: m1 + m3 = 3.82 + 0.94 = 4.76 g, the proportion of movable oil produced: (m1 + m3) / M0 = 4.76 / 100 = 4.76%; The amount of shale gas produced: M0 - M1 - m1 - m2 - m3 = 100 - 92.28 - 3.82 - 1.05 - 0.94 = 1.91 g, the proportion of shale gas produced: (M0 - M1 - m1 - m2 - m3) / M0 = 1.91 / 100 = 1.91%.

[0067] In the second embodiment of the present invention, the sample is oil shale in the shape of fragments, with an initial mass M0 of 100 g. The number of outer shells is two. One reaction chamber is filled with columnar oil shale cores, and the other reaction chamber is filled with a counterweight of the same weight. The carbon dioxide injection heating process is adopted, with a preset pressure P0 of 20 MPa, a preset temperature T0 of 550 °C, a heating rate of 5 °C / min, a first preset time t1 of 1 h, a preset rotation speed r0 of 5000 r / min, a second preset time t2 of 0.5 h, and a third preset time t3 of 40 min.

[0068] Before use, weigh the fragmented oil shale cores, with an initial mass of 100 g. Then place the cores in the fixed chamber, tighten the top plate, wrap the sealing member around the outer periphery of the side plate and place it in the reaction chamber. After installing the elastic member, tighten the second housing with the first housing. Then place the reaction assembly in the limiting groove and fix it. Then inject carbon dioxide into the reaction chamber through the air inlet channel. During the injection process, the internal gas pressure change in the reaction chamber should be detected in real time until the internal pressure of the reaction chamber reaches the preset pressure of 20 MPa. Then turn on the heating assembly and heat the cores to the preset temperature of 550 °C at a heating rate of 5 °C / min. Then maintain the cores at the preset temperature of 550 °C for the first preset time of 1 h to allow the cores to fully react. During this process, the opening of the air outlet channel can be controlled by the second control valve to release some gas to adjust the internal air pressure of the reaction chamber and stabilize it at the preset pressure of 20 MPa.

[0069] After the heating assembly has been operating for 1 h, remove the injection pipeline, close the top cover, set the preset rotation speed of 5000 r / min, and turn on the centrifugal assembly after the second preset time of 0.5 h to throw out the movable oil inside the cores and throw it towards the baffle through the air outlet holes and the sealing member.

[0070] After the centrifugal assembly has been operating for 0.5 h, open the air outlet valve to release the oil and gas, and perform real-time cooling and collection outside. After the pressure release is complete, control the first control valve to open the air inlet channel and introduce a certain flow rate of nitrogen through the air inlet channel to purge the cores and the oil and gas products inside the reaction chamber to release them to the maximum extent through the air outlet valve. Record the mass of the collected oil as m1 (m1 = 13.43 g) and the mass of the water as m2 (m2 = 4.21 g). After purging for 40 min, stop the gas injection, turn off the heating assembly. After the device has cooled to room temperature, take out the cores and weigh them again, and record the mass as M1 (M1 = 75.74 g). At the same time, collect the residual oil inside the sealing member and the reaction chamber with an organic solvent and weigh and record it as m3 (m3 = 1.68 g). Finally, clean the entire device for the next use.

[0071] The calculation methods for the mass and proportion of each product in the shale after the experiment are as follows: The amount of movable oil produced: m1 + m3 = 13.43 + 1.68 = 15.11 g. The proportion of movable oil produced: (m1 + m2) / M0 = 15.11 / 100 = 15.11%. The amount of shale gas produced: M0 - M1 - m1 - m2 - m3 = 100 - 75.74 - 13.43 - 4.21 - 1.68 = 4.94 g. The proportion of shale gas produced: (M0 - M1 - m1 - m2 - m3) / M0 = 4.94 / 100 = 4.94%.

[0072] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0073] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features.

[0074] In the description of the present invention, the meaning of "a plurality" is two or more.

[0075] In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0076] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0077] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for evaluating oil and gas production in shale, characterized in that: include: A heating component, wherein a heating cavity is formed in the heating component; A centrifugal assembly, the centrifugal assembly is rotatably disposed in the heating chamber, and a limiting groove is formed on the centrifugal assembly; A reaction component, wherein the reaction component is disposed in the limiting groove, a reaction chamber is formed in the reaction component, and an air inlet channel and an air outlet channel communicating with the reaction chamber are formed on the reaction component; A clamping assembly, wherein the clamping assembly is disposed in the reaction chamber and a fixed cavity is formed inside the clamping assembly, the fixed cavity is suitable for accommodating a core, and an air inlet and an air outlet are formed on the clamping assembly and communicate with the fixed cavity, the air inlet is communicated with the air inlet channel, and the air outlet is communicated with the air outlet channel; The reaction assembly comprises: A first shell, wherein the first shell is disposed in the limiting groove, a fixing member is disposed in the first shell, a fixing end is formed on one side of the fixing member along the first direction, and the fixing end is limitedly matched with one end of the clamping assembly along the first direction; The second shell is arranged on one side of the first shell along the first direction and is sealed with the first shell, the air inlet channel and the air outlet channel are formed on the second shell, and the inner wall of the second shell is formed with an elastic member connected with the other end of the clamping assembly along the first direction.

2. The oil and gas production evaluation device for shale according to claim 1, characterized in that: A baffle is provided on one side of the second shell facing the clamping assembly, and a free end of the baffle is connected to the fixing member; Wherein, the reaction chamber is formed between the baffle, the fixing member and the second shell.

3. The oil and gas production evaluation device for shale according to claim 2, characterized in that: An air inlet cavity is formed between the outer wall of the baffle and the inner wall of the first shell, and the fixing member forms an air vent and a first through hole and a second through hole connected to the air vent, the first through hole is connected to the air inlet cavity, and the second through hole is arranged corresponding to the air inlet hole.

4. The oil and gas production evaluation device for shale according to claim 3, characterized in that: The clamping assembly comprises: A bottom plate, the bottom plate is arranged on the fixing member and is limitedly matched with the fixing end, a part of the bottom plate is arranged corresponding to the second through hole, and the air inlet hole is formed on the bottom plate; a side plate, the side plate being arranged on a side of the bottom plate away from the fixing member and extending along the first direction, the side plate being formed with the air outlet; A top plate, the top plate is arranged at the free end of the side plate and matched with the side plate, and the top plate is connected to the elastic member; Wherein, the bottom plate, the side plate and the top plate define the fixing cavity.

5. The oil and gas production evaluation device for shale according to claim 4, characterized in that: Also includes: A sealing member is received in the reaction chamber and is disposed around the outer peripheral wall of the side plate. Along the first direction, one end of the sealing member abuts against the fixed end, and the other end of the sealing member abuts against the top plate.

6. The oil and gas production evaluation device for shale according to claim 1, characterized in that: The centrifugal assembly comprises: A centrifugal generator, wherein the centrifugal generator is disposed on the heating component; a rotating shaft, the rotating shaft being dynamically connected to the centrifugal generator; A shell, the bottom end of which is connected to the free end of the rotating shaft, and the limiting groove is formed on the shell; A flip cover is movably disposed on the housing and is suitable for fixing the reaction component in the limiting groove.

7. The oil and gas production evaluation device for shale according to claim 6, characterized in that: There are multiple shells, the bottom ends of the multiple shells are connected to the rotating shaft, and the multiple shells are symmetrically arranged along the axis of the rotating shaft.

8. The oil and gas production evaluation device for shale according to claim 6, characterized in that: The heating assembly comprises: A base, wherein a top of the base is provided with a mounting groove suitable for mounting the centrifugal generator; A heating element, the heating element is disposed on the top of the base and extends along a first direction; A top cover, the top cover being arranged at a free end of the heating element; Wherein, the base, the heating element and the top cover define the heating chamber.

9. A method for evaluating oil and gas production in shale, characterized in that: The oil and gas production evaluation method is applied to the oil and gas production evaluation device according to any one of claims 1 to 8, and the oil and gas production evaluation method comprises: Controlling the reaction assembly to make the reaction chamber reach a simulated environment, wherein the simulated environment includes the reaction chamber being filled with an inert gas and the reaction chamber reaching a preset pressure; Controlling the heating component to heat the reaction chamber for a first preset time; Controlling the centrifugal assembly to centrifuge the core for a second preset time; The reaction component is controlled to open an air inlet channel and an air outlet channel to collect the oil and gas products in the reaction chamber.

Images