A jet-type dual-water-holding tracer logging tool

Abstract

The present invention relates to a jet-type dual-water-holding tracer logging instrument, comprising a measuring circuit short section, a liquid storage cylinder, a measuring cylinder and a motor push-retract short section connected in sequence, wherein a liquid storage chamber is provided inside the liquid storage cylinder, the liquid storage chamber contains an oily tracer liquid, and a measuring chamber is provided inside the measuring cylinder; a push-pull piston is provided inside the liquid storage chamber, a jet nozzle is provided at the end of the liquid storage chamber, and the liquid storage chamber is connected to the measuring chamber through the jet nozzle; a liquid inlet and a liquid outlet are respectively provided on the side wall of the measuring cylinder, and a first water-holding probe and a second water-holding probe are provided inside the measuring chamber, and the first water-holding probe and the second water-holding probe are respectively connected to a ground acquisition system through a measuring circuit. The tracer logging instrument adopts non-radioactive oily tracer liquid, which is safe, reliable and pollution-free. In addition, the test probe adopted by the tracer logging instrument is smaller in size and has higher measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of well logging equipment, and in particular relates to a jet-type dual-holding water tracer well logging instrument. Background Art

[0002] In the development of oil fields, it is necessary to measure the liquid production in oil wells. The methods used to measure liquid production at home and abroad mainly include turbine flow measurement method and tracer flow measurement method. For the turbine flow measurement method, due to the structural characteristics of the turbine flowmeter itself, it is impossible to effectively measure light and heavy oil, high condensate oil wells, and sand production wells. In the oil fields across the country, light and heavy oil, heavy oil, and high condensate oil wells account for a high proportion, so the turbine flow logging instrument has not been widely promoted and applied.

[0003] The tracer flow measurement method is widely used, but the logging tracers used in the current tracer flow measurement method are all radioactive liquids, or the water molecules are activated by neutron oxygen activation technology to make them radioactive. The existing isotope tracer flow measurement method directly injects the radioactive isotope tracer into the water body, which will cause water pollution. In addition, the detection components used in the existing tracer logging instruments are mostly photomultiplier tubes, which are expensive, which increases the manufacturing cost of the logging instrument. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a jet-type dual-holding water tracer logging tool. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] The present invention provides a jet-type dual-water-holding tracer logging instrument, comprising a measuring circuit short section, a liquid storage cylinder, a measuring cylinder and a motor push-and-retract short section connected in sequence, wherein:

[0006] The liquid storage cylinder has a liquid storage cavity inside, and the liquid storage cavity contains an oily tracer liquid, and the measuring cylinder has a measuring cavity inside;

[0007] The measuring circuit short section is provided with a measuring circuit, and the motor push-and-retract short section is provided with a motor;

[0008] A push-pull piston is arranged inside the liquid storage chamber, one end of which is connected to the motor, and an injection nozzle is provided at the end of the liquid storage chamber, through which the liquid storage chamber is connected to the measuring chamber;

[0009] A liquid inlet and a liquid outlet are respectively provided on the side walls of the measuring tube, a first water holding probe and a second water holding probe are arranged inside the measuring cavity, and the first water holding probe and the second water holding probe are respectively connected to a ground acquisition system through a measuring circuit.

[0010] In one embodiment of the present invention, the liquid storage cylinder and the measuring cylinder are connected via an intermediate connecting piece, the outer wall of the first end of the intermediate connecting piece is clamped with the inner wall of the measuring cylinder, and the outer wall of the second end of the intermediate connecting piece is clamped with the inner wall of the liquid storage cylinder.

[0011] In one embodiment of the present invention, a sealing ring is provided between the outer wall of the first end of the intermediate connecting member and the inner wall of the measuring cylinder; and a sealing ring is provided between the outer wall of the second end of the intermediate connecting member and the inner wall of the liquid storage cylinder.

[0012] In one embodiment of the present invention, the first water holding probe and the second water holding probe are arranged parallel to the axial direction of the measuring tube, wherein the first water holding probe is arranged at one end of the measuring cavity away from the liquid storage cavity, and the second water holding probe is arranged in the middle of the measuring cavity.

[0013] In one embodiment of the present invention, both the first water holding probe and the second water holding probe are capacitance probes, and both have a length of 3-6 cm.

[0014] In one embodiment of the present invention, the oily tracer liquid is a silicone grease blend or a grease blend.

[0015] In one embodiment of the present invention, a sealing ring is provided between the outer wall of the push-pull piston and the inner wall of the liquid storage cylinder.

[0016] In one embodiment of the present invention, a liquid injection port connected to the liquid storage cavity is provided on the side wall of the liquid storage cylinder, and a liquid injection sealing plug is provided in the liquid injection port.

[0017] In one embodiment of the present invention, the motor is connected to the measuring circuit via a connecting pin that crosses the liquid storage cavity and the measuring cavity.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The jet-type dual-holding water tracer logging instrument of the present invention adopts a non-radioactive oily tracer liquid, the density of which is close to the density of the fluid in the oil well, and can conveniently measure the flow velocity of the low-flow fluid in the oil well. At the same time, since the tracer is a non-radioactive fluid, it is safe, reliable and pollution-free.

[0020] 2. The test probe used in the jet-type dual-holding water tracer logging instrument of the present invention is a capacitance probe, which is metal inside and wrapped with insulating material outside. Compared with the existing photomultiplier tube probe, the capacitance probe is smaller in size and thus has higher measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a cross-sectional schematic diagram of a jet-type dual-holding water tracer logging tool provided in an embodiment of the present invention;

[0022] Figure 2 The present invention is a schematic diagram of the use process of the jet-type dual-holding water tracer logging tool provided in an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1- measuring circuit short section; 2- measuring cylinder; 3- liquid storage cylinder; 4- motor push-retract short section; 5- liquid storage chamber; 6- measuring chamber; 7- push-pull piston; 8- injection nozzle; 9- liquid inlet; 10- liquid outlet; 11- first water holding probe; 12- second water holding probe; 13- middle connecting piece; 14- sealing ring; 15- liquid injection port; 16- liquid injection sealing plug; 17- connecting pin; 18- casing; 19- oil layer. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments, but the embodiments of the present invention are not limited thereto.

[0026] Embodiment 1

[0027] See also Figure 1 , Figure 1 It is a cross-sectional schematic diagram of a jet-type dual-holding water tracer logging instrument provided by an embodiment of the present invention. As shown in the figure, the jet-type dual-holding water tracer logging instrument includes a measuring circuit short section 1, a measuring tube 2, a liquid storage tube 3 and a motor push-and-retract short section 4 connected in sequence, wherein the measuring circuit short section 1 is used to accommodate the measuring circuit, and the motor push-and-retract short section 4 is used to accommodate the motor that pushes the tracer liquid, and the motor is electrically connected to the measuring circuit. In this embodiment, the motor is connected to the measuring circuit through a connecting pin 17 that crosses the liquid storage chamber 5 and the measuring chamber 6. A liquid storage chamber 5 is provided inside the liquid storage tube 3, and the liquid storage chamber 5 contains an oily tracer liquid, and a measuring chamber 6 is provided inside the measuring tube 2.

[0028] A push-pull piston 7 is provided inside the liquid storage chamber 5, one end of which is connected to the motor, and the push-pull piston 7 can reciprocate inside the liquid storage chamber 5 according to the rotation of the motor. A spray nozzle 8 is provided at the end of the liquid storage chamber 5, and the liquid storage chamber 5 is connected to the measuring chamber 6 through the spray nozzle 8, so that the oily tracer liquid inside the liquid storage chamber 5 can be sprayed into the measuring chamber 6 through the spray nozzle 8 during the extension and retraction process of the push-pull piston 7.

[0029] A liquid inlet 9 and a liquid outlet 10 are respectively provided on the side walls of the measuring tube 2. In the present embodiment, the liquid inlet 9 is arranged on the side wall of the measuring tube 2 close to one end of the liquid storage tube 3, and the liquid outlet 10 is arranged on the side wall of the measuring tube 2 close to one end of the measuring circuit short section 1.

[0030] The first water holding probe 11 and the second water holding probe 12 are arranged inside the measuring cavity 6, and the first water holding probe 11 and the second water holding probe 12 are respectively connected to the ground acquisition system through the measuring circuit. In this embodiment, the first water holding probe 11 and the second water holding probe 12 are arranged parallel to the axial direction of the measuring tube 2, wherein the first water holding probe 11 is arranged at one end of the measuring cavity 6 away from the liquid storage cavity 5, and the second water holding probe 12 is arranged in the middle of the measuring cavity 6. Further, the first water holding probe 11 is arranged near the liquid inlet 9, and the second water holding probe 12 is arranged near the liquid outlet 10.

[0031] Further, in this embodiment, the first water-holding probe 11 and the second water-holding probe 12 are both capacitance probes, which are metal inside and wrapped with insulating material outside. The metal inside the probe is insulated from the instrument housing, and the medium change between the probe and the instrument housing can be detected. The length of the first water-holding probe 11 and the second water-holding probe 12 are both 3-6 cm, which is smaller than the existing photomultiplier tube probe (length of 20-30 cm), so the measurement accuracy is higher.

[0032] Continue to refer to Figure 1 The liquid storage cylinder 3 and the measuring cylinder 2 are connected by an intermediate connecting piece 13, the outer wall of the first end of the intermediate connecting piece 13 is engaged with the inner wall of the measuring cylinder 2, and the outer wall of the second end of the intermediate connecting piece 13 is engaged with the inner wall of the liquid storage cylinder 3. When not in use, the liquid storage cylinder 3 and the measuring cylinder 2 can be disassembled from the intermediate connecting piece 13, so as to be maintained and stored separately.

[0033] Furthermore, a sealing ring 14 is provided between the outer wall of the first end of the intermediate connecting member 13 and the inner wall of the measuring cylinder 2 ; and a sealing ring 14 is provided between the outer wall of the second end of the intermediate connecting member 13 and the inner wall of the liquid storage cylinder 3 .

[0034] The jet-type dual-holding water tracer logging instrument of this embodiment uses a non-radioactive oily tracer liquid, whose density is close to the density of the fluid in the oil well, and can conveniently measure the flow velocity of the low-flow fluid in the oil well. At the same time, since the tracer is a non-radioactive fluid, it is safe, reliable and pollution-free.

[0035] Embodiment 2

[0036] On the basis of the above-mentioned embodiments, the oily tracer liquid used in the jet-type dual-holding water tracer logging instrument of this embodiment is a silicone grease blend or a grease blend, and its density is close to the density of the liquid in the well. Therefore, the flow velocity of the oily tracer liquid is the same as the flow velocity of the liquid in the well to be tested.

[0037] Furthermore, a sealing ring 14 is provided between the outer wall of the push-pull piston 7 and the inner wall of the liquid storage cylinder 3 , so as to prevent the tracer liquid from flowing into the motor through the push-pull piston 7 and damaging the normal operation of the motor.

[0038] Furthermore, in the present embodiment, a liquid injection port 15 connected to the liquid storage chamber 5 is provided on the side wall of the liquid storage tube 3, and the liquid injection port 15 is used to inject the required oily tracer liquid into the liquid storage chamber 5 before measurement. After the injection is completed, a liquid injection sealing plug 16 is provided in the liquid injection port 15 to prevent leakage of the tracer liquid.

[0039] The use process of the jet type dual water holding tracer logging tool of this embodiment is as follows:

[0040] See also Figure 2 , Figure 2 Schematic diagram of the use process of the jet type dual water-holding tracer logging instrument provided by an embodiment of the present invention. Before logging, an oily tracer liquid with a density close to that of the liquid in the well is first injected into the liquid storage cylinder 3, and then the various parts of the jet type dual water-holding tracer logging instrument are combined and placed from the oil pipe or the annular space between the oil pipe and the casing 18 to the appropriate depth to be measured.

[0041] During the measurement process, the motor is powered by the measurement circuit, the motor starts to rotate, and the motor pushes the push-pull piston 7 to extend and retract, and then the oily tracer liquid in the liquid storage chamber is sprayed into the measurement chamber 6 through the spray nozzle 8.

[0042] As mentioned above, the lower end of the measuring tube 2 is provided with a liquid inlet 9; the upper end is provided with a liquid outlet 10. In an oil-producing well, crude oil and formation water will flow to the surface through the casing 18. During the logging process, the jet-type dual-water-holding tracer logging instrument reaches the upper end of the oil layer 19. During the upward movement of crude oil from the bottom of the well, part of the fluid flows in from the liquid inlet 9 and then flows out from the liquid outlet 10. In this process, when the fluid in the well flows through the measuring tube 2, it will drive the oily tracer liquid flowing out from the jet nozzle 8. When the oily tracer liquid passes through the first water-holding probe 11, the capacitance value at the first water-holding probe 11 will change; when the oily tracer liquid passes through the second water-holding probe 12, the capacitance value of the second water-holding probe 12 changes. According to the capacitance changes of the first water-holding probe 11 and the second water-holding probe 12, the time when the oily tracer liquid reaches the two probes can be detected, and the distance between the two probes is known. According to the formula: speed = distance / time, the flow velocity v of the fluid in the well can be calculated. a The specific calculation formula is as follows:

[0043]

[0044] Wherein, L1 is the distance between the first water holding probe 11 and the second water holding probe 12 , and Δt1 is the time interval for the tracer liquid to pass through the first water holding probe 11 and the second water holding probe 12 along with the fluid in the well.

[0045] Furthermore, there is a measuring circuit inside the measuring circuit short section 1, and the measuring circuit can send the capacitance change values ​​of the two water holding probes to the ground acquisition system through encoding, so as to be calculated by the ground acquisition system.

[0046] The test probe used in the jet-type dual-holding water tracer logging instrument of this embodiment is a capacitance probe, which is metal inside and wrapped with insulating material outside. Compared with the existing photomultiplier tube probe, the capacitance probe is smaller in size and has higher measurement accuracy.

[0047] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A jet-type dual-holding water tracer logging tool, It is characterized in that It comprises a measuring circuit short section (1), a measuring cylinder (2), a liquid storage cylinder (3) and a motor push-and-retract short section (4) which are connected in sequence, wherein: The liquid storage cylinder (3) has a liquid storage cavity (5) inside, and the liquid storage cavity (5) contains an oily tracer liquid, and the measuring cylinder (2) has a measuring cavity (6) inside; The measuring circuit short section (1) is provided with a measuring circuit, and the motor push-and-retract short section (4) is provided with a motor; A push-pull piston (7) is arranged inside the liquid storage chamber (5), one end of the push-pull piston (7) is connected to the motor, an injection nozzle (8) is provided at the end of the liquid storage chamber (5), and the liquid storage chamber (5) is connected to the measuring chamber (6) via the injection nozzle (8); The side walls of the measuring tube (2) are respectively provided with a liquid inlet (9) and a liquid outlet (10); a first water holding probe (11) and a second water holding probe (12) are arranged inside the measuring cavity (6); the first water holding probe (11) and the second water holding probe (12) are respectively connected to a ground acquisition system through a measuring circuit; The liquid storage cylinder (3) and the measuring cylinder (2) are connected via an intermediate connecting piece (13), the outer wall of the first end of the intermediate connecting piece (13) is clamped with the inner wall of the measuring cylinder (2), and the outer wall of the second end of the intermediate connecting piece (13) is clamped with the inner wall of the liquid storage cylinder (3); The first water holding probe (11) and the second water holding probe (12) are arranged parallel to the axial direction of the measuring tube (2), wherein the first water holding probe (11) is arranged at an end of the measuring cavity (6) away from the liquid storage cavity (5), and the second water holding probe (12) is arranged in the middle of the measuring cavity (6).

2. The jet-type dual-holding water tracer logging tool according to claim 1, It is characterized in that A sealing ring (14) is provided between the outer wall of the first end of the intermediate connecting member (13) and the inner wall of the measuring cylinder (2); and a sealing ring (14) is provided between the outer wall of the second end of the intermediate connecting member (13) and the inner wall of the liquid storage cylinder (3).

3. The jet-type dual-holding water tracer logging tool according to claim 1, It is characterized in that The first water holding probe (11) and the second water holding probe (12) are both capacitance probes with a length of 3-6 cm.

4. The jet-type dual-holding water tracer logging tool according to claim 1, It is characterized in that The oily tracer liquid is a silicone grease blend or a grease blend.

5. The jet-type dual-holding water tracer logging tool according to claim 1, It is characterized in that A sealing ring (14) is provided between the outer wall of the push-pull piston (7) and the inner wall of the liquid storage cylinder (3).

6. The jet-type dual-holding water tracer logging tool according to claim 1, It is characterized in that A liquid injection port (15) connected to the liquid storage chamber (5) is provided on the side wall of the liquid storage cylinder (3), and a liquid injection sealing plug (16) is provided in the liquid injection port (15).

7. The jet-type dual-holding water tracer logging tool according to any one of claims 1 to 6, It is characterized in that The motor is connected to the measuring circuit via a connecting pin (17) that crosses the liquid storage chamber (5) and the measuring chamber (6).

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