CN110702710B - Experimental device for measuring residual oil distribution of tight oil reservoir and residual oil measuring method - Google Patents
Experimental device for measuring residual oil distribution of tight oil reservoir and residual oil measuring method Download PDFInfo
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- CN110702710B CN110702710B CN201911141613.6A CN201911141613A CN110702710B CN 110702710 B CN110702710 B CN 110702710B CN 201911141613 A CN201911141613 A CN 201911141613A CN 110702710 B CN110702710 B CN 110702710B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/082—Measurement of solid, liquid or gas content
Abstract
The invention discloses an experimental device for measuring the distribution of residual oil in a tight oil reservoir, which comprises: the sand filling pipe fixing part comprises a bracket and a sand filling pipe arranged on the bracket; the sand taking part comprises a guide rail, a moving support in sliding fit with the guide rail, a low-speed motor arranged on the moving support, a drill bit in transmission connection with the output end of the low-speed motor, and a sand receiving plate arranged on the moving support and positioned right below the motor and the drill bit, the guide rail and a sand filling pipe are parallel to each other, and the drill bit is positioned on the axis of the sand filling pipe; during operation, the movable support drives the drill bit and towards filling the gliding while of sand pipe, and low-speed motor drive drill bit is filling the intraductal rotation of sand and drilling out and is filling the intraductal oil sand of sand, oil sand is discharged in proper order and is fallen on connecing the sand board in proper order via filling one side that the sand pipe is close to the drill bit. The method for measuring the distribution of the residual oil of the tight oil reservoir based on the device has the advantages of low cost, convenience in use and high measurement efficiency and precision.
Description
Technical Field
The invention belongs to the technical field of oilfield development experimental equipment, and particularly relates to an experimental device for measuring the distribution of residual oil in a tight oil reservoir and a residual oil measuring method.
Background
In the oil exploitation process, the physical parameters of reservoir rocks and fluids are particularly important for improving the recovery ratio. The physical property parameters obtained by the method of simulating the oil reservoir rock by using the sand-packed pipe through experiments are of great significance to the guidance of oil field development.
After the simulation displacement oil production and huff and puff oil production experiments are finished, the research on the oil sand in the sand filling pipe provides a favorable basis for the analysis of the distribution of the residual oil. The oil sand after the experiment has the characteristics of large crude oil viscosity, high oil sand hardness and large oil viscosity, and most of the conventional manual digging modes take out the oil sand in the sand filling pipe, and carry out CT scanning and nuclear magnetic resonance or analyze the distribution condition of the residual oil in the oil sand by adopting a sectional weighing mode. Adopt artificial mode strength low, be difficult to clear up out oil sand, the oil sand distribution of inefficiency, clearance out is inhomogeneous. The analysis process by methods such as CT scanning and nuclear magnetic resonance is complicated, the cost is high, and the method does not have wide applicability. The sand is not uniformly taken by a weighing method, the weight difference of the oil sand after being washed and dried is small, and the analysis error of the residual oil is large.
Aiming at the problems that the manual cleaning of the oil sand of the sand filling pipe is low in labor efficiency, the method for analyzing the distribution of the residual oil in the oil sand through the CT scanning and nuclear magnetic resonance technology is complex in process, expensive in cost and free of wide applicability, sand taking by a weighing method is not uniform, the weight difference of the oil sand after being washed and dried is small, and the analysis error of the residual oil is large. The invention discloses an experimental device for measuring the distribution of residual oil in a tight oil reservoir and a residual oil measuring method, and solves the practical engineering problem.
Disclosure of Invention
Aiming at the problems, the invention discloses an experimental device for measuring the distribution of residual oil in a tight oil reservoir and a residual oil measuring method. According to the invention, the method for manually digging the sand filling pipe after the experiment is not used any more to clean the oil sand for CT scanning and nuclear magnetic resonance analysis of the distribution of the residual oil, but the method for uniformly cleaning the oil sand for qualitative analysis by a mechanical drilling and digging mode is used, so that the problems of low manual efficiency, nonuniform distribution of the cleaned oil sand, complicated process, high cost, no wide applicability and the like of the method for analyzing the distribution of the residual oil in the oil sand by the technologies such as CT scanning, nuclear magnetic resonance and the like are solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an experimental device for measuring the distribution of residual oil in a tight oil reservoir comprises:
the sand filling pipe fixing part comprises a bracket and a sand filling pipe arranged on the bracket;
the sand taking part comprises a guide rail, a moving support in sliding fit with the guide rail, a low-speed motor arranged on the moving support, a drill bit in transmission connection with the output end of the low-speed motor, and a sand receiving plate arranged on the moving support and positioned right below the motor and the drill bit, the guide rail and a sand filling pipe are parallel to each other, and the drill bit is positioned on the axis of the sand filling pipe; during operation, the movable support drives the drill bit and towards filling the gliding while of sand pipe, and low-speed motor drive drill bit is filling the intraductal rotation of sand and drilling out and is filling the intraductal oil sand of sand, oil sand is discharged in proper order and is fallen on connecing the sand board in proper order via filling one side that the sand pipe is close to the drill bit.
Further, the support comprises a bottom plate, an outer frame vertically arranged on the bottom plate and 2 cylindrical sand filling pipe fixing devices; the sand filling pipe fixing device is respectively sleeved at two ends of the sand filling pipe, the outer wall of the sand filling pipe is in clearance fit with the inner wall of the sand filling pipe fixing device, threaded holes are respectively formed in two sides of the side wall of the sand filling pipe fixing device, screws penetrate through the threaded holes, and the sand filling pipe is installed and then the stud is screwed down to fix the sand filling pipe; the sand filling pipe fixer is fixedly connected with the bottom plate and the outer frame through the branch frame.
Furthermore, the branch frame comprises 2 bottom support rods which are distributed at the bottom of the sand filling pipe fixer in a splayed manner and 1 top support rod which is positioned at the top of the sand filling pipe fixer; the top end of the bottom supporting rod is fixedly connected with the sand filling pipe fixer, and the bottom end of the bottom supporting rod is fixedly connected with the bottom plate; the top support rod is positioned in the vertical direction, the top end of the top support rod is fixedly connected with the outer frame, and the top end of the top support rod is fixedly connected with the sand filling pipe fixer.
Further, the 2 bottom support bars are at an angle of 60 ° to each other.
Further, the rotating speed of the low-speed motor is less than 20 r/min; and/or the drill bit is processed by a drill bit, and the radial size and the axial size of the drill bit are matched with the sand filling pipe (1); preferably, the drill bit has a radius of 23mm and a length of 100 mm.
The method for measuring the residual oil distribution of the tight oil reservoir is based on the experimental device for measuring the residual oil distribution of the tight oil reservoir, and comprises the following experimental steps:
a. taking down covers at two ends of the sand filling pipe filled with the oil sand, mounting the sand filling pipe on the support, and adjusting the center position of the sand filling pipe to be aligned with the drill bit;
b. checking whether the drill bit is aligned with the sand filling pipe, then pushing the movable support to the rightmost side, starting the low-speed motor, slowly pushing the movable support leftwards to drill through the oil sand of the sand filling pipe, enabling the drilled oil sand to fall on the sand receiving plate, turning off the low-speed motor, and taking out the drill bit;
c. the oil sand shaping frame is placed on oil absorption paper, oil sand on the sand receiving plate is sequentially filled into the oil sand fixing frame according to the position sequence of the oil sand in the sand filling pipe, the thickness of the oil sand at each position in the oil sand fixing frame is consistent, after the oil absorption paper absorbs crude oil attached to the oil sand for 72 hours, the oil sand fixing frame is moved away, the oil sand on the oil absorption paper is removed, and the oil stain width d at the position of the same distance L at intervals is measured by a ruler and recorded.
The experimental device and the method for measuring the residual oil distribution of the compact oil reservoir have the beneficial effects that the experimental device and the method for measuring the residual oil distribution of the compact oil reservoir are provided, the problems that the manual cleaning of the oil sand of the sand filling pipe is low in labor efficiency, the method for analyzing the oil sand residual oil distribution by using the CT scanning and nuclear magnetic resonance technology is complex in process, expensive in cost and not wide in applicability, the sand is not uniformly taken by using a weighing method, the weight difference of the oil sand after being washed and dried is small, the residual oil analysis error is large and the like are solved, and the experimental device and the method have the advantages of being low in cost, convenient to use, and high in measurement efficiency and precision.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a structural schematic diagram of a sand-packed pipe fixing ring.
FIG. 3 is a schematic diagram of an oil sand sizing frame.
Fig. 4a is a schematic diagram of absorbing 72h oil absorbing paper things.
FIG. 4b is a schematic diagram showing the distribution of the remaining oil at each position of the sand-packed pipe.
The reference numbers in the figures are: 1. the sand filling machine comprises a sand filling pipe, 2 guide rails, 3 a movable support, 4a low-speed motor, 5 a drill bit, 6 a sand receiving plate, 7 a bottom plate, 8 an outer frame, 9 a sand filling pipe fixing device, 10 a branch support, 10-1 a bottom support rod, 10-2 a top support rod, 11 a screw, 12 oil absorption paper, 13 oil sand paper and 14 an oil sand fixing frame.
Detailed Description
The invention is described in more detail below with reference to the following examples:
as shown in fig. 1 and fig. 2, an experimental device for measuring the remaining oil distribution of a tight oil reservoir. The utility model provides a measure tight oil reservoir remaining oil distribution experimental apparatus which characterized in that: the method comprises the following steps: the sand filling pipe fixing part comprises a bracket and a sand filling pipe 1 arranged on the bracket; the sand taking part comprises a guide rail 2, a movable support 3 in sliding fit with the guide rail 2, a low-speed motor 4 arranged on the movable support, a drill bit 5 in transmission connection with the output end of the low-speed motor 4, and a sand receiving plate 6 arranged on the movable support and positioned right below the motor and the drill bit, wherein the guide rail 2 and the sand filling pipe 1 are parallel to each other, and the drill bit 5 is positioned on the axis of the sand filling pipe 1; during operation, movable support 3 drives the drill bit and towards filling sand pipe 1 gliding while, and low-speed motor 4 drive drill bit 5 is at the intraductal rotation of filling sand and drills out the interior oil sand of filling sand pipe, the oil sand is discharged in proper order and is fallen on connecing sand plate 6 in proper order via the one end that fills sand pipe is close to drill bit 5.
Specifically, the support comprises a bottom plate 7, an outer frame 8 vertically arranged on the bottom plate 7 and 2 cylindrical sand filling pipe fixing devices 9; the sand filling pipe fixing devices 9 are respectively sleeved at two ends of the sand filling pipe 1, the outer wall of the sand filling pipe 1 is in clearance fit with the inner wall of the sand filling pipe fixing device 9, threaded holes are respectively formed in two sides of the side wall of the sand filling pipe fixing device 9, screws penetrate through the threaded holes, and the sand filling pipe 1 is installed in the sand filling pipe fixing device 9 and then is screwed down to fix the sand filling pipe 1; the sand-filled pipe fixer 9 is fixedly connected with the bottom plate 7 and the outer frame 8 through a branch frame 10.
The branch frame 10 comprises 2 bottom support rods 10-1 which are distributed at the bottom of the sand-filling pipe fixer in a splayed manner and 1 top support rod 10-2 which is positioned at the top of the sand-filling pipe fixer 9; the top end of the bottom support rod 10-1 is fixedly connected with a sand filling pipe fixer 9, and the bottom end is fixedly connected with the bottom plate 7; the top support rod 10-2 is positioned in the vertical direction, the top end of the top support rod is fixedly connected with the outer frame 8, and the bottom end of the top support rod is fixedly connected with the sand filling pipe fixer 9. The 2 bottom support bars 10-1 are mutually at an angle of 60 degrees.
The rotating speed of the low-speed motor 4 is less than 20r/min, and the drill bit 5 is characterized in that the drill bit is formed by processing a drill bit, the radius of the drill bit is 23mm, and the length of the drill bit is 100 mm.
Based on the experimental device for measuring the distribution of the residual oil of the tight oil reservoir, the device and the method for measuring the residual oil of the tight oil reservoir in a simulation mode comprise the following steps:
a. loosening screws on two sides of the sand filling pipe fixing device 9, taking down covers at two ends of the sand filling pipe 1 filled with the oil sand, penetrating the sand filling pipe 2 into the two sand filling pipe fixing devices 9 from right to left, adjusting the central axis of the sand filling pipe 1 to be on the same straight line with the central axis of the drill bit (5), and screwing the screws to fix the sand filling pipe 1.
b. Checking whether a drill bit 5 is aligned with the sand filling pipe 1, then pushing the movable support 3 to the rightmost side, starting the low-speed motor 4, slowly pushing the movable support 3 to the left and drilling the oil sand in the sand filling pipe 1, sequentially dropping the drilled oil sand on the sand receiving plate 6 through the right end of the sand filling pipe 1, shutting down the low-speed motor 4 after all the oil sand in the sand filling pipe 1 is drilled out, and taking out the drill bit 5.
c. Placing the oil sand shaping frame on oil absorption paper, sequentially filling the oil sand on the sand receiving plate into an oil sand fixing frame according to the position sequence of the oil sand in the sand filling pipe, enabling the thickness of the oil sand at each position in the oil sand fixing frame to be consistent, removing the oil sand fixing frame and removing the oil sand on the oil absorption paper after the oil absorption paper absorbs crude oil attached to the oil sand for 72 hours, and measuring the oil stain width d of the oil sand along the axis direction at the distance of every 1cm by using a ruler and recording the oil stain width d.
Table 1: oil stain width of each position of oil absorption paper
And (4) drawing different positions and oil spot widths in the table 1 to obtain the residual oil distribution diagram of the sand-packed pipe, such as fig. 4a and 4b, wherein fig. 4a and 4b are the residual oil distribution diagrams of the sand-packed pipe after multiple times of nitrogen huff and puff mining of the sand-packed pipe with the axial dimension of 60 cm. As can be seen from the figure, the energy of crude oil can be fully increased due to the nitrogen in the near well section (0-10cm) of the sand-filled pipe, and the residual oil is low after multiple rounds of huffing and puff; the nitrogen in the far well section (15-50cm) of the sand filling pipe cannot effectively reach the area for multiple times to increase crude oil energy, the distance from the well head is far, the loss of crude oil flowing resistance is large, part of the nitrogen is dissolved in the crude oil, so that the viscosity of the crude oil is reduced, the flowing performance of the crude oil is improved, when the crude oil in the position of 30-40cm flows to the position of 20-30cm, the pressure at the last stage of huffing and puff is reduced, the nitrogen is separated out, the crude oil is difficult to flow due to the increase of the viscosity of the crude oil, and the phenomenon that the residual oil in the far well section has high ends and low middle is caused.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (6)
1. The utility model provides a measure tight oil reservoir remaining oil distribution experimental apparatus which characterized in that: the sand filling pipe fixing part comprises a bracket and a sand filling pipe (1) arranged on the bracket; the sand taking part comprises a guide rail (2), a movable support (3) in sliding fit with the guide rail (2), a low-speed motor (4) arranged on the movable support (3), a drill bit (5) in transmission connection with the output end of the low-speed motor (4), and a sand receiving plate (6) which is arranged on the movable support (3) and is positioned right below the motor and the drill bit, wherein the guide rail (2) and the sand filling pipe (1) are parallel to each other, and the drill bit (5) is positioned on the axis of the sand filling pipe (1); when the movable support (3) works, the drill bit is driven by the movable support (3) to slide towards the sand filling pipe (1), the drill bit (5) is driven by the low-speed motor (4) to rotate in the sand filling pipe, oil sand in the sand filling pipe is drilled, and the oil sand is sequentially discharged from one end, close to the drill bit (5), of the sand filling pipe and sequentially falls on the sand receiving plate (6);
placing the oil sand shaping frame on oil absorption paper, sequentially filling the oil sand on the sand receiving plate (6) into an oil sand fixing frame according to the position sequence of the oil sand in a sand filling pipe, and enabling the thickness of the oil sand at each position in the oil sand fixing frame to be consistent; and after the oil absorption paper absorbs crude oil attached to the oil sand for at least 72 hours, removing the oil sand fixing frame and removing the oil sand on the oil absorption paper, and measuring and recording the oil stain width d of the oil sand at the same distance L at intervals along the axial direction by using a ruler.
2. The experimental device for measuring the residual oil distribution of the tight oil reservoir according to claim 1, wherein: the support comprises a bottom plate (7), an outer frame (8) vertically arranged on the bottom plate (7), 2 cylindrical sand filling pipe fixing devices (9) and a branch support (10) used for fixedly connecting the sand filling pipe fixing devices (9) to the bottom plate (7) and the outer frame (8); the sand filling pipe fixing device (9) is respectively sleeved at two ends of the sand filling pipe (1), the outer wall of the sand filling pipe (1) is in clearance fit with the inner wall of the sand filling pipe fixing device (9), threaded holes are respectively formed in two sides of the side wall of the sand filling pipe fixing device (9), screws penetrate through the threaded holes, and the sand filling pipe (1) is installed in the sand filling pipe fixing device (9) and then is screwed down to fix the sand filling pipe (1).
3. The experimental device for measuring the residual oil distribution of the tight oil reservoir according to claim 2, wherein: the branch frame (10) comprises 2 bottom support rods (10-1) distributed at the bottom of the sand filling pipe fixer in a splayed manner and 1 top support rod (10-2) positioned at the top of the sand filling pipe fixer (9); the top end of the bottom supporting rod (10-1) is fixedly connected with the sand filling pipe fixer (9), and the bottom end of the bottom supporting rod (10-1) is fixedly connected with the bottom plate (7); the top support rod (10-2) is positioned in the vertical direction, the top end of the top support rod is fixedly connected with the outer frame (8), and the bottom end of the top support rod (10-2) is fixedly connected with the sand filling pipe fixer (9).
4. The experimental device for measuring the residual oil distribution of the tight oil reservoir according to claim 3, wherein: the 2 bottom supporting rods (10-1) are mutually at an angle of 60 degrees.
5. The experimental device for measuring the residual oil distribution of the tight oil reservoir according to claim 1, wherein: the rotating speed of the low-speed motor (4) is less than 20 r/min; the drill bit (5) is formed by processing a drill bit, and the radial size and the axial size of the drill bit are matched with those of the sand filling pipe (1).
6. A method for measuring the remaining oil distribution of a tight oil reservoir is characterized by comprising the following steps: the method is carried out on the basis of the device for simulating and measuring the residual oil of the tight oil reservoir according to any one of claims 1 to 5, and comprises the following experimental steps:
taking down covers at two ends of a sand filling pipe (1) filled with oil sand, mounting the sand filling pipe (1) on a support, adjusting the central axis of the sand filling pipe (1) to be on the same straight line with the central axis of a drill bit (5), and screwing screws to mount and fix the sand filling pipe (1);
secondly, pushing the movable support (3) to the rightmost side, starting the low-speed motor (4), slowly pushing the movable support (3) to the left and drilling through the oil sand in the sand filling pipe (1), sequentially dropping the drilled oil sand on a sand receiving plate (6) through the right end of the sand filling pipe (1), stopping the low-speed motor (4) after all the oil sand in the sand filling pipe (1) is drilled out, and taking out the drill bit (5);
secondly, placing the oil sand shaping frame on oil absorption paper, sequentially filling the oil sand on the sand receiving plate (6) into an oil sand fixing frame according to the position sequence of the oil sand in a sand filling pipe, and enabling the thickness of the oil sand at each position in the oil sand fixing frame to be consistent; and after the oil absorption paper absorbs crude oil attached to the oil sand for at least 72 hours, removing the oil sand fixing frame and removing the oil sand on the oil absorption paper, and measuring and recording the oil stain width d of the oil sand at the same distance L at intervals along the axial direction by using a ruler.
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| CN113107459B (en) * | 2021-03-29 | 2022-02-15 | 西安石油大学 | Oil displacement sand pipe model sand filling-discharging integrated device and experimental method |
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