Electrically Controlled Oil Bag Flow-Type Water Cut Tester

Abstract

The present invention relates to the technical field of downhole operations and is an electronically controlled oil bladder flow-through type flow rate and water cut tester, which comprises an upper circuit protection tube, a liquid outlet joint, a flow-through tube, a liquid inlet joint, a lower circuit protection tube, a water cut sensor, a flow rate sensor, an oil bladder rubber cylinder, a hydraulic pump, a motor and an oil tank. The inner side of the lower end of the upper circuit protection tube is fixedly provided with a liquid outlet joint, and the liquid outlet joint is provided with an upper flow-through channel with an opening downward. A liquid outlet hole capable of communicating with the upper flow-through channel is arranged on the outer side of the liquid outlet joint, and a water cut sensor and a flow rate sensor are arranged in the upper flow-through channel. The structure of the present invention is reasonable and compact, and it is convenient to use. The oil liquid in the oil tank is pumped into the oil bladder rubber cylinder through the hydraulic pump, so that the oil bladder rubber cylinder seals the annulus. By setting a pressure relief valve, the oil bladder rubber cylinder can be quickly depressurized, shortening the charging and discharging cycle of the oil bladder rubber cylinder, and having the characteristics of accuracy, high efficiency and rapidity.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole operations and is an electronically controlled oil bag flow-through type flow rate and water cut tester. Background Art

[0002] The production profile logging data is an important basis for formulating and adjusting the oilfield development plan, and the water cut measurement is one of the important parameters in the production profile logging. At present, the impedance type water cut meter is mainly widely used in the measurement of the water cut of the oil-water two-phase flow in vertical oil wells in oilfield production. The working principle of the impedance type water cut meter is to determine the water cut by measuring the ratio of the conductivity of the downhole oil-water mixed phase to the conductivity of the water phase therein. When the flow collection umbrella is opened and the liquid inlet is opened, the conductivity of the oil-water mixed phase is measured, which is called the mixed phase value; when the flow collection umbrella is closed and the liquid inlet is sealed, the instrument measures the conductivity of the water phase in the sampling state, which is called the full water value. The ratio of the full water value to the mixed phase value is the relative response of the water cut, and the magnitude of the relative response of the water cut reflects the magnitude of the water cut of the fluid to be measured. The accurate measurement of the full water value is the key factor for the water cut measurement. During the logging process, it is necessary to continuously open and close the umbrella, which increases the risk of instrument instability; if the liquid inlet cannot be completely closed when closing the umbrella, the oil-phase fluid will enter the sampling cylinder, resulting in the inability to measure the full water value normally, leading to the failure of the water cut measurement and the inability to obtain accurate production profile logging data.

[0003] In addition, when the existing water cut meter uses a turbine flowmeter to measure the fluid flow rate, due to the requirement of the starting displacement, it is impossible to perform low-flow measurement. To increase the fluid flow velocity, a flow collection umbrella is usually used to collect the oil-water mixed liquid into the central flow hole. A water cut sensor and a turbine flow sensor are installed in the central flow hole to complete the measurement work. Due to the existence of the flow collection umbrella, it is only possible to stop and test point by point during the downhole logging process, which is very difficult for oil layers with very close adjacent distances. Summary of the Invention

[0004] The present invention provides an electronically controlled oil bag flow-through type flow rate and water cut tester, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of inaccurate low-flow measurement in the existing water cut test.

[0005] The technical solution of the present invention is achieved by the following measures: An electronically controlled oil bladder flow-through type water cut tester includes an upper circuit protection tube, a liquid outlet joint, a flow-through tube, a liquid inlet joint, a lower circuit protection tube, a water content sensor, a flow sensor, an oil bladder rubber cylinder, a hydraulic pump, a motor and a fuel tank. The inner side of the lower end of the upper circuit protection tube is fixedly installed with a liquid outlet joint. The liquid outlet joint is provided with an upper flow-through channel with a downward opening. The outer side of the liquid outlet joint is provided with a liquid outlet hole that can communicate with the upper flow-through channel. The water content sensor and the flow sensor are arranged in the upper flow-through channel; The outer side of the lower part of the liquid outlet joint is fixedly installed with a flow-through tube whose lower end is located below it. The middle part of the flow-through tube is provided with a middle flow-through channel that penetrates up and down. The outer side of the middle part of the flow-through tube is provided with an oil bladder rubber cylinder; The outer side of the lower end of the flow-through tube is fixedly installed with a liquid inlet joint whose lower end is located below it. The liquid outlet joint is provided with a lower flow-through channel with an upward opening. The outer side of the liquid inlet joint is provided with a liquid inlet hole that can communicate with the lower flow-through channel; The upper flow-through channel, the middle flow-through channel and the lower flow-through channel are communicated in sequence from top to bottom; The upper end of the liquid inlet joint is fixedly installed with a lower circuit protection tube on the outer side. The lower circuit protection tube is provided with a hydraulic pump, a motor and a fuel tank. The driving shaft of the motor is connected to the input end of the hydraulic pump. The liquid inlet of the hydraulic pump is communicated with the fuel tank through a first oil circuit. The liquid outlet of the hydraulic pump is communicated with the liquid inlet of the oil bladder rubber cylinder through a second oil circuit. The liquid outlet of the oil bladder rubber cylinder is communicated with the fuel tank through a third oil circuit. A pressure relief valve is arranged on the third oil circuit.

[0006] The following is a further optimization and / or improvement of the above-mentioned invention technical solution:

[0007] The above may further include a safety valve, and a safety valve is arranged on the second oil circuit.

[0008] At least two liquid outlet holes may be evenly distributed along the circumference on the outer side of the middle part of the above-mentioned liquid outlet joint. At least two liquid inlet holes are evenly distributed along the circumference on the outer side of the middle part of the liquid inlet joint. Both the liquid outlet holes and the liquid inlet holes are slender holes.

[0009] The above may further include an upper cable joint and a lower cable joint. The upper cable joint is arranged on the inner side of the upper part of the upper circuit protection tube, and the lower cable joint is arranged on the inner side of the lower part of the lower circuit protection tube.

[0010] On the liquid outlet joint corresponding to the outer side position of the above-mentioned upper flow-through channel, there may be a first wire hole that penetrates up and down. On the flow-through tube corresponding to the outer side position of the middle flow-through channel, there is a second wire hole that penetrates up and down. On the liquid inlet joint corresponding to the outer side position of the lower flow-through channel, there is a third wire hole that penetrates up and down. The first wire hole, the second wire hole and the third wire hole are communicated in sequence from top to bottom.

[0011] The structure of the present invention is reasonable and compact, and it is convenient to use. The oil liquid in the fuel tank is pumped into the oil bladder rubber cylinder by the hydraulic pump to seal the annulus by the oil bladder rubber cylinder; By setting a pressure relief valve, the oil bladder rubber cylinder can be quickly depressurized, shortening the charging and discharging cycle of the oil bladder rubber cylinder, and having the characteristics of accuracy, high efficiency and rapidity. Description of the Drawings

[0012] Appended Figure 1 It is a schematic front sectional view of the best embodiment of the present invention.

[0013] The codes in the appended drawings are respectively: 1 is the upper circuit protection tube, 2 is the liquid outlet joint, 3 is the overcurrent tube, 4 is the liquid inlet joint, 5 is the lower circuit protection tube, 6 is the water content sensor, 7 is the flow sensor, 8 is the oil bladder rubber cylinder, 9 is the hydraulic pump, 10 is the motor, 11 is the fuel tank, 12 is the upper overcurrent channel, 13 is the middle overcurrent channel, 14 is the lower overcurrent channel, 15 is the liquid inlet hole, 16 is the liquid outlet hole, 17 is the safety valve, 18 is the upper cable joint, 19 is the lower cable joint, and 20 is the pressure relief valve. Specific embodiments

[0014] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solution of the present invention and the actual situation.

[0015] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the Figure 1 appended drawings of the specification. For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the appended drawings of the specification.

[0016] The present invention will be further described below in conjunction with the embodiments and the appended drawings:

[0017] As shown in the appended Figure 1As shown in the figure, the electric control oil bag flow-through type flow and water cut tester includes an upper circuit protection tube 1, a liquid outlet joint 2, a flow-through tube 3, a liquid inlet joint 4, a lower circuit protection tube 5, a water cut sensor 6, a flow sensor 7, an oil bag rubber cylinder 8, a hydraulic pump 9, a motor 10 and a fuel tank 11. Inside the lower end of the upper circuit protection tube 1, a liquid outlet joint 2 is fixedly installed. On the liquid outlet joint 2, there is an upper flow-through channel 12 with an opening downward. On the outer side of the liquid outlet joint 2, there is a liquid outlet hole 16 that can communicate with the upper flow-through channel 12. Inside the upper flow-through channel 12, there are a water cut sensor 6 and a flow sensor 7; on the outer side of the lower part of the liquid outlet joint 2, a flow-through tube 3 with its lower end located below it is fixedly installed. In the middle of the flow-through tube 3, there is a middle flow-through channel 13 that penetrates up and down. On the outer side of the middle part of the flow-through tube 3, there is an oil bag rubber cylinder 8; on the outer side of the lower end of the flow-through tube 3, a liquid inlet joint 4 with its lower end located below it is fixedly installed. On the liquid outlet joint 2, there is a lower flow-through channel 14 with an opening upward. On the outer side of the liquid inlet joint 4, there is a liquid inlet hole 15 that can communicate with the lower flow-through channel 14; the upper flow-through channel 12, the middle flow-through channel 13 and the lower flow-through channel 14 are connected in sequence from top to bottom; on the outer side of the upper end of the liquid inlet joint 4, a lower circuit protection tube 5 is fixedly installed. Inside the lower circuit protection tube 5, there are a hydraulic pump 9, a motor 10 and a fuel tank 11. The driving shaft of the motor 10 is connected to the input end of the hydraulic pump 9. The liquid inlet of the hydraulic pump 9 is communicated with the fuel tank 11 through a first oil circuit. The liquid outlet of the hydraulic pump 9 is communicated with the liquid inlet of the oil bag rubber cylinder 8 through a second oil circuit. The liquid outlet of the oil bag rubber cylinder 8 is communicated with the fuel tank 11 through a third oil circuit. A pressure relief valve 20 is provided on the third oil circuit.

[0018] During the well logging process, after the ground issues a flow concentration command, the hydraulic pump 9 pumps the hydraulic oil carried in the fuel tank 11 into the oil bag rubber cylinder 8, causing the oil bag rubber cylinder 8 to expand and tightly adhere to the inner wall of the casing, blocking the annular space between the outer circle of the present invention and the inner wall of the casing. The produced liquid in the casing enters the lower flow-through channel 14, the middle flow-through channel 13 and the upper flow-through channel 12 in sequence through the liquid inlet hole 15, and the flow rate and water cut parameters of the produced liquid in the casing are obtained by the water cut sensor 6 and the flow sensor 7 in the upper flow-through channel 12. The present invention seals off the annulus through the oil bag rubber cylinder 8 to complete flow concentration and data testing. Compared with the traditional flow concentration umbrella type flow concentration, the flow concentration effect is better, there is no leakage, and the test data accuracy is higher; in addition, the present invention uses a single-core cable for power supply and modular design, and can realize multiple charging and discharging of the oil bag rubber cylinder 8 for flow concentration in one trip downhole, facilitating the measurement of the flow rate and water cut data of each production layer in the wellbore, and there is no need to continuously support and retract the umbrella during the well logging process, avoiding the risk of instability of the umbrella support and retraction instrument.

[0019] According to actual needs, the above-mentioned electric control oil bag flow-through type flow and water cut tester can be further optimized or / and improved:

[0020] As attached Figure 1 As shown in the figure, it further includes a safety valve 17, and a safety valve 17 is provided on the second oil circuit. During use, by setting the safety valve 17, it is ensured that the pressure difference between the inside and outside of the oil bag rubber cylinder 8 does not exceed the safety value.

[0021] As shown in the attached Figure 1 figure, at least two liquid outlet holes 16 are evenly distributed along the circumference on the outer side of the middle part of the liquid outlet joint 2, and at least two liquid inlet holes 15 are evenly distributed along the circumference on the outer side of the middle part of the liquid inlet joint 4. Both the liquid outlet holes 16 and the liquid inlet holes 15 are elongated holes. During use, with such a setting, the present invention can collect liquid flow better and faster to complete the test of corresponding data.

[0022] As shown in the attached Figure 1 figure, it further includes an upper cable joint 18 and a lower cable joint 19. The upper cable joint 18 is provided on the inner side of the upper part of the upper circuit protection tube 1, and the lower cable joint 19 is provided on the inner side of the lower part of the lower circuit protection tube 5. During use, with such a setting, it is convenient for data transmission.

[0023] As shown in the attached Figure 1 figure, a first wire passing hole penetrating up and down is provided on the liquid outlet joint 2 corresponding to the outer side position of the upper liquid passing channel 12, a second wire passing hole penetrating up and down is provided on the liquid passing tube 3 corresponding to the outer side position of the middle liquid passing channel 13, and a third wire passing hole penetrating up and down is provided on the liquid inlet joint 4 corresponding to the outer side position of the lower liquid passing channel 14. The first wire passing hole, the second wire passing hole and the third wire passing hole are communicated in sequence from top to bottom. During use, by arranging cables in the first wire passing hole, the second wire passing hole and the third wire passing hole, they are isolated from the upper liquid passing channel 12, the middle liquid passing channel 13 and the lower liquid passing channel 14, avoiding affecting the contact between the liquid and the cables.

[0024] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and the best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An electronically controlled oil bladder flow-through type water cut tester, characterized in that It includes an upper circuit protection tube, a liquid outlet joint, an overcurrent tube, a liquid inlet joint, a lower circuit protection tube, a water content sensor, a flow sensor, an oil bladder rubber cylinder, a hydraulic pump, a motor and a fuel tank. The liquid outlet joint is fixedly installed inside the lower end of the upper circuit protection tube. The liquid outlet joint is provided with an upper overcurrent channel with a downward opening. The outer side of the liquid outlet joint is provided with a liquid outlet hole that can communicate with the upper overcurrent channel. The water content sensor and the flow sensor are arranged in the upper overcurrent channel; the lower outer side of the liquid outlet joint is fixedly installed with an overcurrent tube with its lower end located below it. The middle of the overcurrent tube is provided with a middle overcurrent channel that penetrates up and down. The outer side of the middle of the overcurrent tube is provided with an oil bladder rubber cylinder; the lower outer side of the overcurrent tube is fixedly installed with a liquid inlet joint with its lower end located below it. The liquid outlet joint is provided with a lower overcurrent channel with an upward opening. The outer side of the liquid inlet joint is provided with a liquid inlet hole that can communicate with the lower overcurrent channel; the upper overcurrent channel, the middle overcurrent channel and the lower overcurrent channel are communicated in sequence from top to bottom; the upper outer side of the liquid inlet joint is fixedly installed with a lower circuit protection tube. The lower circuit protection tube is provided with a hydraulic pump, a motor and a fuel tank. The driving shaft of the motor is connected to the input end of the hydraulic pump. The liquid inlet of the hydraulic pump is communicated with the fuel tank through a first oil circuit. The liquid outlet of the hydraulic pump is communicated with the liquid inlet of the oil bladder rubber cylinder through a second oil circuit. The liquid outlet of the oil bladder rubber cylinder is communicated with the fuel tank through a third oil circuit. A pressure relief valve is arranged on the third oil circuit; at least two liquid outlet holes are evenly distributed along the circumference on the outer side of the middle of the liquid outlet joint. At least two liquid inlet holes are evenly distributed along the circumference on the outer side of the middle of the liquid inlet joint. The liquid outlet holes and the liquid inlet holes are all slender holes; a first wiring hole that penetrates up and down is provided on the liquid outlet joint corresponding to the outer side position of the upper overcurrent channel. A second wiring hole that penetrates up and down is provided on the overcurrent tube corresponding to the outer side position of the middle overcurrent channel. A third wiring hole that penetrates up and down is provided on the liquid inlet joint corresponding to the outer side position of the lower overcurrent channel. The first wiring hole, the second wiring hole and the third wiring hole are communicated in sequence from top to bottom; it also includes a safety valve. A safety valve is arranged on the second oil circuit; it also includes an upper cable joint and a lower cable joint. The upper cable joint is arranged inside the upper part of the upper circuit protection tube. The lower cable joint is arranged inside the lower part of the lower circuit protection tube.

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