CN111561311A - Optical fiber water exploration test system and test method for oil field mechanical production horizontal well - Google Patents
Optical fiber water exploration test system and test method for oil field mechanical production horizontal well Download PDFInfo
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- CN111561311A CN111561311A CN202010491415.9A CN202010491415A CN111561311A CN 111561311 A CN111561311 A CN 111561311A CN 202010491415 A CN202010491415 A CN 202010491415A CN 111561311 A CN111561311 A CN 111561311A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
Abstract
The invention provides an optical fiber water exploration test system for an oil field mechanical production horizontal well, which comprises: the device comprises an oil pipe, a test optical fiber, a liquid inlet device, a plurality of gratings, an optical transmitter and receiver and an optical fiber grating demodulator; the tail end of the oil pipe is plugged and is put into an oil well casing of a horizontal well, an opening is formed in the side wall of the vertical section of the oil pipe, and a guide sealing sleeve for communicating the oil well casing and the oil pipe is arranged at the opening; the test optical fiber is put into the oil well casing and passes through the guide sealing sleeve to enter the oil pipe, and the tail end of the test optical fiber is fixed in the horizontal section of the oil pipe; the plurality of liquid inlet devices are respectively connected to the horizontal section of the oil pipe, and each liquid inlet device is respectively communicated with the oil pipe and the oil well casing pipe; the plurality of gratings are connected to the test optical fiber and are uniformly distributed on the test optical fiber; the optical transceiver is connected with the test optical fiber signal; the fiber grating demodulator is in signal connection with the optical transmitter and receiver. The invention also provides an optical fiber water exploration testing method of the oil field mechanical production horizontal well, which is implemented by adopting the optical fiber water exploration testing system of the oil field mechanical production horizontal well.
Description
Technical Field
The invention belongs to the field of oilfield development, and particularly relates to an optical fiber water exploration test system and method for an oilfield mechanical production horizontal well.
Background
Along with the continuous enlargement of the development scale of the horizontal well, the problem of prolonging the water breakthrough of the oil well along with the development time is solved while the recovery efficiency of the oil field is improved, the productivity of the oil well is rapidly reduced after the water breakthrough, the liquid production profile test of the horizontal well needs to be developed urgently, the underground temperature parameters are directly read on the ground, a basis is provided for optimizing the development scheme and improving the recovery efficiency, and therefore the water shutoff is implemented in a targeted manner. The conventional production profile testing technology of the horizontal well at present has great testing difficulty in each production section, and mainly has the following defects: 1. in the conventional testing technology, the testing success rate is low (30%) because the crawler meets the card; 2. poor instrument response in small flow and fluid layering states, e.g. large starting displacement (starting flow rate 0.01m/s, 5) of turbine flowmeter1/2″The corresponding flow of the sleeve is 10.6m3D); 3. the conventional liquid production profile test cannot directly read data, the test time is long (average 15 days/well), and the operation risk is increased by taking down a test pipe column; 4. the mechanical method testing technology is stuck open by a packer, which does not belong to the test under the same pressure system, and the measuring result is inaccurate.
Disclosure of Invention
In view of the above, the present invention provides an optical fiber water exploration testing system and a testing method for an oil field mechanical production horizontal well, which are used for overcoming the above problems or at least partially solving or alleviating the above problems.
The invention provides an optical fiber water exploration test system for an oil field mechanical production horizontal well, which comprises:
the oil pipe is arranged in an oil well casing of a horizontal well, an opening is formed in the side wall of the vertical section of the oil pipe, a guide sealing sleeve is arranged at the opening and is communicated with the oil well casing and the oil pipe, and the tail end of the horizontal section of the oil pipe is plugged;
the test optical fiber is lowered from the oil well casing and penetrates through the guide sealing sleeve to enter the oil pipe, and the tail end of the test optical fiber is fixed in the horizontal section of the oil pipe;
the liquid inlet devices are respectively connected to the horizontal section of the oil pipe, and each liquid inlet device is respectively communicated with the oil pipe and the oil well casing pipe;
the gratings are connected in series on the test optical fiber and are uniformly distributed on the test optical fiber;
the optical transceiver is connected with the test optical fiber signal;
and the fiber grating demodulator is in signal connection with the optical transmitter and receiver.
The invention also has the following optional features.
Optionally, the end of the test optical fiber is connected with a pressure guide body, and the pressure guide body is fixed at the end of the horizontal section of the oil pipe.
Optionally, an annular positioning groove is formed in an inner side wall of the tail end of the horizontal section of the oil pipe, and the pressure guide body can be clamped in the annular positioning groove.
Optionally, a packer is arranged between the oil pipe and the oil well casing, the packer is located between the vertical section and the horizontal section of the oil pipe and the oil well casing, and the guide sealing sleeve is arranged on the side wall of the oil pipe above the packer.
Optionally, a guide plug is connected to the end of the horizontal section of the oil pipe.
Optionally, the liquid inlet device is a constant pressure valve.
Optionally, the inner end of the guide sealing sleeve extends into the oil pipe from an opening on the oil pipe and inclines downwards, and the outer end opening of the guide sealing sleeve inclines upwards.
The invention also provides an optical fiber water exploration test method for the oil field mechanical production horizontal well, which comprises the following steps:
s001: judging a test oil well according to the oil production mixing amount of the oil well, and taking out an original oil pipe after sand washing and well washing are carried out on an oil well casing of the test oil well;
s002: reassembling a connecting oil pipe, connecting a packer and a plurality of liquid inlet devices in the reassembled oil pipe, forming a hole on the side wall of the oil pipe, arranging a guide sealing sleeve at the hole, installing a pressure guide device in the oil pipe, connecting a test optical fiber on the pressure guide device, leading the other end of the test optical fiber out of the oil pipe from the guide sealing sleeve, and connecting a plurality of gratings on the test optical fiber in series;
s003: the well-assembled and connected oil pipe is put into a horizontal well, and a packer is started to anchor the oil pipe in an oil well casing;
s004: pumping pressure fluid into the oil pipe to push the pressure guide body to move to an annular positioning groove at the tail end of the oil pipe, enabling each testing section of the horizontal section of the oil well to be provided with a liquid inlet device and a grating correspondingly, and connecting the testing optical fiber with an optical transceiver and an optical fiber grating demodulator;
s005: pressing the oil well casing to conduct the liquid inlet device, and allowing the liquid in each testing section of the horizontal section of the oil well to enter the oil pipe through the liquid inlet device;
s006: setting an oil well pump in an oil pipe through a supporting device, starting the oil pumping unit to drive the oil well pump to pump liquid through an oil pumping rod, and pumping the liquid produced in each testing section of the horizontal section of the oil well into a grating with a corresponding flow path in the oil pipe and then pumping the liquid out of the ground;
s007: the optical transceiver emits laser to detect the wavelength change condition of the corresponding grating, inputs the information into the fiber grating demodulator, obtains the temperature profile test curve of each test section, and judges the water production condition of each part of the oil well horizontal section according to the temperature profile test curve.
According to the optical fiber water exploration test system and the test method for the oil field mechanical production horizontal well, the test optical fiber and the lower part of the plurality of serially connected gratings are placed in the horizontal section of the oil pipe, and in the oil production process of the oil pipe, the temperature of each position of the horizontal section of the oil well is tested through the optical transceiver, the test optical fiber, the plurality of gratings and the optical fiber grating demodulator, so that the water production condition of each position of the horizontal section of the oil well is judged, and position information is provided for the next step of targeted water plugging. Furthermore, the optical fiber water exploration test system and the test method for the oil field mechanical production horizontal well are simple in process, high in test efficiency and accurate in positioning, and can reduce the site construction operation cost.
Drawings
FIG. 1 is a schematic structural diagram of an optical fiber water exploration test system of an oilfield mechanical production horizontal well.
In the above figures: 1, oil pipe; 101 an annular positioning groove; 2 oil well casing; 3, guiding a sealing sleeve; 4, testing the optical fiber; 5, a liquid inlet device; 6, grating; 7, an oil pumping unit; 8 oil-well pump; 9 pumping rod; 10, an optical transceiver; 11 fiber grating demodulator; 12, a pressure guide body; 13 a packer; and 14, guiding the plug.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
Example 1
Referring to fig. 1, an embodiment of the present invention provides an optical fiber water exploration testing system for an oil field mechanical production horizontal well, including: the device comprises an oil pipe 1, a test optical fiber 4, a liquid inlet device 5, a plurality of gratings 6, an optical transceiver 10 and an optical fiber grating demodulator 11; the oil pipe 1 is put into an oil well casing 2 of a horizontal well, the side wall of a vertical section of the oil pipe 1 is provided with an opening, a guide sealing sleeve 3 is arranged at the opening, the guide sealing sleeve 3 is communicated with the oil well casing 2 and the oil pipe 1, and the tail end of a horizontal section of the oil pipe 1 is plugged; the test optical fiber 4 is put into the oil well casing 2 and enters the oil pipe 1 through the guide sealing sleeve 3, and the tail end of the test optical fiber 4 is fixed in the horizontal section of the oil pipe 1; the liquid inlet devices 5 are respectively connected to the horizontal section of the oil pipe 1, and each liquid inlet device 5 is respectively communicated with the oil pipe 1 and the oil well casing 2; the plurality of gratings 6 are connected in series on the test optical fiber 4 and are uniformly distributed on the test optical fiber 4; the optical transceiver 10 is in signal connection with the test optical fiber 4; the fiber grating demodulator 11 is in signal connection with the optical transceiver 10.
The oil well needing water exploration test is an oil well with the capacity rapidly reduced after water breakthrough, and water plugging can be carried out pertinently after the water inlet position is obtained. After the reassembled oil pipe 1 is put into the well, a test optical fiber and a grating are spread and expanded on a horizontal section of the oil pipe 1, an oil well pump is put into a vertical section of the oil pipe 1, an oil pumping unit 7 on the ground is connected with an oil well pump 8 through an oil pumping rod 9 to pump oil, and water produced on the horizontal section of an oil well casing 2 enters the horizontal section of the oil pipe 1 through a liquid inlet device 5 under pressure and flows upwards under the action of the oil well pump 8; meanwhile, the optical transmitter and receiver 10 on the ground sends laser through the test optical fiber 4 to detect the wavelength change condition of the corresponding grating 6, the temperature of each section of oil production and water production parts of the horizontal section of the oil pipe 1 is different, the temperature of the water production parts is higher, the wavelength distribution of the grating 6 at each position in the horizontal well is detected in real time, and the optical fiber grating demodulator 11 on the ground receives the wavelength distribution signal and then converts the wavelength distribution signal to obtain the temperature profile test curve of the horizontal section of the oil well, so that the water production condition of each section of the horizontal section of the oil well can be judged. The fiber grating demodulator 11 is a standard device, and can be purchased in the market.
Example 2
Referring to fig. 1, on the basis of embodiment 1, the end of the test optical fiber 4 is connected with a pressure guide body 12, and the pressure guide body 12 is fixed at the end of the horizontal section of the oil pipe 1.
After the pressure guide body 12 is placed in the oil pipe 1 and connected with the testing optical fiber 4, the pressure is pressed into the oil pipe 1, the pressure pushes the pressure guide body 12 to move towards the tail end of the oil pipe 1 until the pressure guide body moves to the tail end of the oil pipe 1 and is fixed, and the testing optical fiber 4 and the grating 6 are completely stretched out in the horizontal section of the oil pipe 1.
Example 3
On the basis of embodiment 2, an annular positioning groove 101 is arranged on the inner side wall of the tail end of the horizontal section of the oil pipe 1, and the pressure guide body 12 can be clamped in the annular positioning groove 101.
When the pressure guide body 12 moves to the annular positioning groove 101 at the end of the oil pipe 1, the edge of the pressure guide body extends, is clamped and fixed, and cannot move continuously in the oil pipe 1, so that the positions of the test optical fiber 4 and the grating 6 are also fixed.
Example 4
Referring to fig. 1, in example 1, one or more packers 13 are provided between the tubing 1 and the well casing 2, a first packer 13 is located between the vertical and horizontal sections of the tubing 1 and well casing 2, and an opening in the tubing 1 and a guiding gland 3 are provided in the sidewall of the tubing 1 above the first packer 13.
After the packer 13 is set, the oil pipe 1 can be anchored in the oil well casing 2, so that the oil well casing is fixed, the opening on the oil pipe 1 and the guide sealing sleeve 3 are positioned above the first packer 13, and the test optical fiber 4 and the grating 6 cannot be influenced by the packer 13 when being put into the oil pipe 1.
Example 5
Referring to fig. 1, on the basis of embodiment 1, a guide plug 14 is connected to the end of the horizontal section of the oil pipe 1.
The guide screw plug 14 is a plug which is in threaded connection with the tail end of the oil pipe 1, and the end part of the guide screw plug is provided with an arc surface, so that the oil pipe 1 can be conveniently put into a well.
Example 6
Referring to fig. 1, on the basis of embodiment 1, the liquid inlet device 5 is a constant pressure valve.
The liquid production volume of the oil well horizontal segment of different sections is different, and the pressure in the well is different, and the constant pressure valve only switches on after the pressure at place section is greater than preset pressure, makes fluid get into oil pipe 1 in, can detect the position of intaking of oil well horizontal segment through constant pressure valve cooperation grating 6.
Example 7
On the basis of embodiment 1, the inner end of the guide sealing sleeve 3 extends into the oil pipe 1 from an opening on the oil pipe 1 and inclines downwards, and the outer end opening of the guide sealing sleeve 3 inclines upwards.
The guide sealing sleeve 3 is fixed at the opening on the side wall of the oil pipe 1, and the test optical fiber 4 penetrates through the guide sealing sleeve 3, so that the oil pipe 1 can be sealed, oil leakage is avoided, meanwhile, the test optical fiber 4 and the grating 6 can conveniently penetrate through the guide sealing sleeve, and the test optical fiber 4 and the grating 6 can not be scratched.
Example 8
The embodiment of the invention also provides an optical fiber water exploration test method for the oil field mechanical production horizontal well, which comprises the following steps: s001: judging a test oil well according to the oil production mixing amount of the oil well, and taking out an original oil pipe 1 after carrying out sand washing and well washing on an oil well casing 2 of the test oil well; s002: reassembling the connecting oil pipe 1, connecting a packer 13 and a plurality of liquid inlet devices 5 in the reassembling oil pipe 1, opening a hole on the side wall of the oil pipe 1, arranging a guide sealing sleeve 3 at the opening, installing a pressure guide body 12 in the oil pipe 1, connecting a test optical fiber 4 on the pressure guide body 12, leading the other end of the test optical fiber 4 out of the oil pipe 1 from the guide sealing sleeve 3, and connecting a plurality of gratings 6 on the test optical fiber 4 in series; s003: the well-assembled and connected oil pipe 1 is put into a horizontal well, and a packer 13 is started to anchor the oil pipe 1 in an oil well casing 2; s004: a pressure fluid is driven into the oil pipe 1 to push the pressure guide body 12 to move to the annular positioning groove 101 at the tail end of the oil pipe 1, so that each testing section of the horizontal section of the oil well is correspondingly provided with a liquid inlet device 5 and a grating 6, and the testing optical fiber 4 is connected with the optical transceiver 10 and the fiber grating demodulator 11; s005: pressing the oil well casing 2 to conduct the liquid inlet device 5, and enabling liquid in each testing section of the horizontal section of the oil well to enter the oil pipe 1 through the liquid inlet device 5; s006: the oil well pump 8 is put into the oil pipe 1 and is set through the supporting device, the oil pumping unit 7 is started to drive the oil well pump 8 to pump liquid through the oil pumping rod 9, and the liquid produced in each testing section of the horizontal section of the oil well enters the grating 6 corresponding to the flow path in the oil pipe 1 and is pumped out of the ground; s007: the optical transceiver 10 emits laser to detect the wavelength change condition of the corresponding grating 6, inputs the information into the fiber grating demodulator 11, obtains the temperature profile test curve of each test section, and judges the water production condition of each part of the oil well horizontal section according to the temperature profile test curve.
In S002, the distance between every two adjacent gratings 6 on the test optical fiber 4 is equal to the distance between every two adjacent liquid inlet devices 5 on the oil pipe 1, and the distance between every two gratings 6 is 5-20 m. The liquid inlet device 5 adopts a constant pressure valve, and the conduction pressure of the constant pressure valve is set to be 10-20 MPa.
In S006, the oil pumping unit 7 drives the oil well pump 8 to work through the oil pumping rod 9, the produced water in the horizontal section of the oil well enters the oil pipe 1 through the constant pressure valves at all places, and the temperature of the produced water is transmitted to the gratings 6 at all places.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (8)
1. The utility model provides an oil field machine-produced horizontal well optic fibre water exploration test system which characterized in that includes:
the oil pipe (1) is lowered into an oil well casing (2) of a horizontal well, an opening is formed in the side wall of a vertical section of the oil pipe (1), a guide sealing sleeve (3) is arranged at the opening, the guide sealing sleeve (3) is communicated with the oil well casing (2) and the oil pipe (1), and the tail end of a horizontal section of the oil pipe (1) is plugged;
the testing optical fiber (4) is lowered from the oil well casing (2) and penetrates through the guide sealing sleeve (3) to enter the oil pipe (1), and the tail end of the testing optical fiber (4) is fixed in the horizontal section of the oil pipe (1);
the liquid inlet devices (5) are respectively connected to the horizontal section of the oil pipe (1), and each liquid inlet device (5) is respectively communicated with the oil pipe (1) and the oil well casing pipe (2);
the gratings (6), the gratings (6) are connected in series on the test optical fiber (4) and are uniformly distributed on the test optical fiber (4);
the optical transceiver (10), the said optical transceiver (10) and said test fiber (4) signal connection;
and the fiber grating demodulator (11), the fiber grating demodulator (11) and the optical transceiver (10) are in signal connection.
2. The optical fiber water exploration test system for the oilfield mechanical production horizontal well according to claim 1, wherein the tail end of the test optical fiber (4) is connected with a pressure guide body (12), and the pressure guide body (12) is fixed at the tail end of the horizontal section of the oil pipe (1).
3. The optical fiber water exploration test system for the oilfield mechanical production horizontal well according to claim 2, wherein an annular positioning groove (101) is formed in the inner side wall of the tail end of the horizontal section of the oil pipe (1), and the pressure guide body (12) can be clamped in the annular positioning groove (101).
4. The oilfield mechanical-production horizontal well optical fiber water exploration test system according to claim 1, wherein one or more packers (13) are arranged between the oil pipe (1) and the oil well casing (2), a first packer (13) is arranged between the vertical section and the horizontal section of the oil pipe (1) and the oil well casing (2), and the opening on the oil pipe (1) and the guiding sealing sleeve (3) are arranged on the side wall of the oil pipe (1) above the first packer (13).
5. The optical fiber water exploration test system for the oilfield mechanical production horizontal well according to claim 1, wherein a guide pipe plug (14) is connected to the tail end of the horizontal section of the oil pipe (1).
6. The optical fiber water exploration test system for the oilfield mechanical production horizontal well according to claim 1, wherein the liquid inlet device (5) is a constant pressure valve.
7. The optical fiber water exploration test system for the oilfield mechanical production horizontal well according to claim 1, wherein the inner end of the guiding sealing sleeve (3) extends into the oil pipe (1) from the opening on the oil pipe (1) and inclines downwards, and the outer end opening of the guiding sealing sleeve (3) inclines upwards.
8. An optical fiber water exploration test method for an oil field mechanical production horizontal well is characterized by comprising the following steps:
s001: judging a test oil well according to the oil production mixing amount of the oil well, and taking out an original oil pipe after sand washing and well washing are carried out on an oil well casing of the test oil well;
s002: reassembling a connecting oil pipe, connecting a packer and a plurality of liquid inlet devices in the reassembled oil pipe, forming a hole on the side wall of the oil pipe, arranging a guide sealing sleeve at the hole, installing a pressure guide device in the oil pipe, connecting a test optical fiber on the pressure guide device, leading the other end of the test optical fiber out of the oil pipe from the guide sealing sleeve, and connecting a plurality of gratings on the test optical fiber;
s003: the well-assembled and connected oil pipe is put into a horizontal well, and a packer is started to anchor the oil pipe in an oil well casing;
s004: pumping pressure fluid into the oil pipe to push the pressure guide body to move to an annular positioning groove at the tail end of the oil pipe, enabling each testing section of each oil well horizontal section to be provided with a liquid inlet device and a grating correspondingly, and connecting a testing optical fiber with an optical transceiver and an optical fiber grating demodulator;
s005: pressing the oil well casing to conduct the liquid inlet device, and allowing the liquid in each testing section of the horizontal section of the oil well to enter the oil pipe through the liquid inlet device;
s006: setting an oil well pump in an oil pipe through a supporting device, starting the oil pumping unit to drive the oil well pump to pump liquid through an oil pumping rod, and pumping the liquid produced in each testing section of the horizontal section of the oil well into a grating with a corresponding flow path in the oil pipe and then pumping the liquid out of the ground;
s007: the optical transceiver emits laser to detect the wavelength change condition of the corresponding grating, inputs the information into the fiber grating demodulator, obtains the temperature profile test curve of each test section, and judges the water production condition of each part of the oil well horizontal section according to the temperature profile test curve.
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| CN202010491415.9A CN111561311A (en) | 2020-06-02 | 2020-06-02 | Optical fiber water exploration test system and test method for oil field mechanical production horizontal well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115263281A (en) * | 2022-08-01 | 2022-11-01 | 中国石油化工股份有限公司 | Horizontal well water exploration test pipe column |
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