Mud one-way valve, sampling barrel and formation tester

Abstract

The invention relates to a slurry one-way valve, a sampling barrel and a formation tester, the slurry one-way valve comprises a valve body, a first hole section and a second hole section which are communicated with each other are arranged in the valve body, and the first hole section and the second hole section are connected to form a slurry through hole penetrating through the valve body; a valve element and an elastic unit are arranged in the second hole section, the end, away from the first hole section, of the second hole section is connected with a limiting piece, a fluid through hole with the axis parallel to the axis of the mud through hole is formed in the limiting piece, the limiting piece is used for limiting the valve element and the elastic unit in the second hole section, and the elastic unit is used for pressing the valve element on the bottom wall of the first hole section. The valve element can seal the mud through hole after being pressed on the bottom wall of the first hole section. When the mud one-way valve is applied to a sampling barrel of a formation tester, the requirement that a formation fluid sample smoothly enters the sampling barrel can be met, the formation fluid sample cannot reversely flow through the mud one-way valve, and therefore the problem that the formation fluid sample in the sampling barrel is lost is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of formation testers, and in particular relates to a mud one-way valve, a sampling tube and a formation tester. Background Art

[0002] The existing formation test sampling instrument mainly realizes sampling and storage of sampled mud through a stop valve. Specifically, when sampling, the stop valve is opened and the formation fluid sample enters the sampling tube through the stop valve. After sampling, the stop valve is closed to limit the outflow of the formation fluid sample in the sampling tube, that is, the formation fluid sample is stored in the sampling tube. Therefore, if the stop valve fails, the formation fluid sample injected into the sampling tube will be lost. According to the one-way fluidity of the one-way valve, in order to prevent the formation fluid sample in the sampling tube from flowing out and not hinder the formation fluid sample from entering the sampling tube, a one-way valve can be set in the sampling fluid channel. Therefore, a mud one-way valve for formation test sampling instruments is needed. Summary of the invention

[0003] In order to solve all or part of the above problems, the present invention aims to provide a mud check valve, a sampling tube and a formation tester. When the mud check valve of the present invention is applied to the sampling tube of the formation tester, the formation fluid sample can smoothly enter the sampling tube, and the formation fluid sample cannot flow back through the mud check valve, thereby overcoming the problem of formation fluid sample loss in the sampling tube.

[0004] According to one aspect of the present invention, a mud one-way valve is provided, comprising a valve body, wherein a first hole section which is interconnected and a second hole section which has a hole diameter larger than that of the first hole section are provided in the valve body, wherein the first hole section and the second hole section are connected to form a mud through hole which penetrates the valve body; a valve core and an elastic unit are provided in the second hole section, and an end of the second hole section away from the first hole section is connected to a limiting member, wherein a fluid through hole whose axis is parallel to the axis of the mud through hole is provided in the limiting member, wherein the limiting member is used to limit the valve core and the elastic unit in the second hole section, and the elastic unit is used to press the valve core against the bottom wall of the first hole section, and the valve core can seal the mud through hole after being pressed against the bottom wall of the first hole section.

[0005] Furthermore, the valve core includes a valve core body and a sealing ring, the sealing ring is sleeved on the valve core body, the sealing ring is located between the valve core body and the bottom wall of the first hole section, and the elastic force of the elastic unit is used to make the valve core body squeeze the sealing ring toward the direction close to the bottom wall of the first hole section so as to seal the mud through hole through the sealing ring.

[0006] Furthermore, the valve core body includes a head and a tail, the diameter of the tail is larger than the aperture of the first hole section, the diameter of the head is smaller than the aperture of the first hole section, the tail and the sealing ring are both located in the second hole section, the sealing ring is sleeved on the head, and the outer diameter of the sealing ring is larger than the inner diameter of the first hole section, and the elastic unit is arranged between the tail and the limit member.

[0007] Furthermore, a threaded hole is provided at one end of the second hole segment away from the first hole segment, the minor diameter of the threaded hole is larger than the hole diameter of the second hole segment, the limiting member is a limiting nut matched with the threaded hole; and the elastic element is a spring.

[0008] Furthermore, a plurality of mud flow holes are provided in the second hole segment, and the length direction of the mud flow holes is parallel to the axis of the second hole segment.

[0009] Furthermore, when the limit member is located inside the mud through hole, the length of the valve body along the axial direction of the mud through hole is less than or equal to 15 mm; when the limit member is partially located outside the mud through hole, the maximum length between one end of the valve body and one end of the limit member along the axial direction of the mud through hole is less than or equal to 15 mm; perpendicular to the axial direction of the mud through hole, the maximum diameter of the valve body is less than or equal to 10 mm.

[0010] Furthermore, an external thread is provided on the outer side of the valve body, and the valve body is fixed in the sample flow channel of the sampling cylinder through the external thread.

[0011] The present invention provides a sampling barrel of a formation tester, comprising a sampling barrel body and a sampling barrel cover fixedly connected to the sampling barrel body, the sampling barrel cover is provided with a sample flow channel, a mud one-way valve is sealed and fixedly connected in the sample flow channel, the mud one-way valve is as described in any one of claims 1 to 7, and along the flow direction of the fluid sample, the first hole section is located upstream of the flow direction, and the second hole section is located downstream of the flow direction.

[0012] Furthermore, the mud one-way valve is threadedly connected to the sample circulation channel, and the mud one-way valve and the sample circulation channel are sealedly connected via a sealing structure.

[0013] The present invention also provides a formation tester, comprising a sampling tube of the formation tester described in any one of the above.

[0014] It can be seen from the above technical solutions that the mud one-way valve, sampling tube and formation tester provided by the present invention have the following beneficial effects:

[0015] When the mud check valve of the present invention is applied to the sampling tube of the formation tester, the requirement that the formation fluid sample can smoothly enter the sampling tube can be met, and the formation fluid sample cannot flow back through the mud check valve, thereby overcoming the problem of the formation fluid sample loss in the sampling tube;

[0016] The mud one-way valve of the present invention adopts a sealing ring for sealing. Compared with the prior art which adopts a metal cone seal or a spherical seal, the sealing ring for sealing has a better sealing effect in a mud environment.

[0017] The mud check valve of the present invention has a relatively small volume, and can be easily installed in a sampling tube with limited space.

[0018] The arrangement of the multiple mud flow holes of the mud one-way valve of the present invention can ensure that the formation fluid sample flows smoothly through the mud one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of a mud one-way valve according to an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of a sampling tube of a formation tester according to an embodiment of the present invention;

[0021] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0022] The reference numerals in the figure are: mud check valve 01, sampling tube body 02, sampling tube cover 03, sample flow channel 031, fluid inlet 032, high pressure manual valve 04, inspection port 05, pressure relief valve 06, sealing structure 07;

[0023] Valve body 011, first hole section 0111, second hole section 0112, mud circulation hole 0113, valve core body 012, head 0121, tail 0122, elastic unit 013, limiter 014, fluid through hole 0141, sealing ring 015. DETAILED DESCRIPTION

[0024] In order to better understand the purpose, structure and function of the present invention, a mud one-way valve, a sampling tube and a formation tester of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1As shown, a mud one-way valve according to an embodiment of the present invention is shown, comprising a valve body 011, wherein a first hole section 0111 and a second hole section 0112 which are interconnected are arranged in the valve body 011, wherein the first hole section 0111 and the second hole section 0112 are connected to form a mud through hole which penetrates the valve body 011; a valve core and an elastic unit 013 are arranged in the second hole section 0112, and a limiting member 014 is connected to one end of the second hole section 0112 away from the first hole section 0111, wherein a fluid through hole 0141 whose axis is parallel to the axis of the mud through hole is provided in the limiting member 014, wherein the limiting member 014 is used to limit the valve core and the elastic unit 013 in the second hole section 0112, and the elastic unit 013 is used to press the valve core against the bottom wall of the first hole section 0111, and the valve core can seal the mud through hole after being pressed against the bottom wall of the first hole section 0111.

[0026] Specifically, the mud one-way valve of this embodiment includes a valve body 011, a first hole section 0111 and a second hole section 0112 in the valve body 011 are interconnected to form a mud through hole, a valve core and an elastic element are arranged in the second hole section 0112, a limiting member 014 is connected in the second hole section 0112, the valve core and the elastic element are limited in the second hole section 0112 by the first hole section 0111 and the limiting member 014, the elastic element is located between the limiting member 014 and the valve core, and the elastic element is used to press the valve core against the bottom wall of the first hole section 0111. The valve core is pressed against the bottom wall of the first hole section 0111 to achieve the blocking of the mud through hole.

[0027] For the mud one-way valve of this embodiment, when the mud flows from the second hole section 0112 to the first hole section 0111, due to the action of the elastic element, the valve core is blocked at the bottom wall of the first hole section 0111, so the mud cannot flow out from the first hole section 0111; on the contrary, when the mud flows from the first hole section 0111 to the second hole section 0112, the pressure of the mud acts on the valve core, and when the mud pressure increases to be greater than the elastic force of the elastic element on the valve core, the mud pressure pushes the valve core open, and the mud through hole is opened at this time, and the mud can flow from the first hole section 0111 to the second hole section 0112. It can be seen from the above two situations that the mud one-way valve of this embodiment has unidirectional conductivity, and when the first hole section 0111 is located upstream of the mud flow direction and the second hole section 0112 is located downstream of the mud flow direction, the mud one-way valve is conductive.

[0028] When the mud one-way valve of this embodiment is applied to the sampling tube of the formation tester, it can meet the requirement of allowing the formation fluid sample to enter the sampling tube smoothly, and even if the stop valve fails, the formation fluid sample cannot flow back through the mud one-way valve, so the formation fluid sample in the sampling tube will not be lost.

[0029] In one embodiment, the valve core includes a valve core body 012 and a sealing ring 015, the sealing ring 015 is sleeved on the valve core body 012, the sealing ring 015 is located between the valve core body 012 and the bottom wall of the first hole section 0111, and the elastic force of the elastic unit 013 is used to make the valve core body 012 squeeze the sealing ring 015 toward the direction close to the bottom wall of the first hole section 0111, so as to seal the mud through hole through the sealing ring 015.

[0030] The valve core of this embodiment includes a valve core body 012 and a sealing ring 015. The elastic force of the elastic element acts on the valve core body 012, and the sealing ring 015 is located between the valve core body 012 and the bottom wall of the first hole section 0111. The elastic force of the elastic element acts on the valve core body 012 to move the valve core body 012 toward the bottom wall of the first hole section 0111. The movement of the valve core body 012 pushes the sealing ring 015 between the valve core body 012 and the bottom wall of the first hole section 0111. Finally, the valve core body 012 is pressed on one side of the sealing ring 015, and the other side of the sealing ring 015 is pressed on the bottom wall of the first hole section 0111.

[0031] In this embodiment, the mud one-way valve is sealed by the sealing ring 015. Compared with the metal cone seal or spherical seal used in the prior art, the sealing effect of the sealing ring 015 used in the mud environment is better.

[0032] In one embodiment, the valve core body 012 includes a head portion 0121 and a tail portion 0122, the diameter of the tail portion 0122 is larger than the aperture of the first hole section 0111, the diameter of the head portion 0121 is smaller than the aperture of the first hole section 0111, the tail portion 0122 and the sealing ring 015 are both located in the second hole section 0112, the sealing ring 015 is sleeved on the head portion 0121, and the outer diameter of the sealing ring 015 is larger than the inner diameter of the first hole section 0111, and the elastic unit 013 is arranged between the tail portion 0122 and the limit member 014.

[0033] In this embodiment, the valve core body 012 includes a head portion 0121 and a tail portion 0122. The tail portion 0122 is located in the second hole section 0112 and has a diameter greater than that of the first hole section 0111. Therefore, the tail portion 0122 cannot pass through the first hole section 0111. The other end of the second hole section 0112 is connected to the limiting member 014. Therefore, the tail portion 0122 is limited in the second hole section 0112; the sealing ring 015 is sleeved on the head portion 0121, and the elastic element is arranged between the limiting member 014 and the tail portion 0122. The elastic force of the elastic element causes the tail portion 0122 to move in the direction close to the first hole section 0111. The tail portion 0122 moves in the direction close to the first hole section 0111, and the sealing ring 015 moves accordingly. Finally, the elastic force of the elastic element causes one side of the sealing ring 015 to be in close contact with the bottom wall of the first hole section 0111, that is, the sealing ring 015 finally achieves the sealing of the mud through hole.

[0034] In one embodiment, a threaded hole is provided at one end of the second hole segment 0112 away from the first hole segment 0111, the minor diameter of the threaded hole is larger than the hole diameter of the second hole segment 0112, the limiting member 014 is a limiting nut matched with the threaded hole; and the elastic element is a spring.

[0035] In this embodiment, the limiting member 014 is a limiting nut, which is threadedly connected to the valve body 011. The arrangement of this embodiment can facilitate the installation of the valve core, the elastic element and the limiting member 014. As an alternative, the elastic element can also be a disc spring.

[0036] In one embodiment, a plurality of mud circulation holes 0113 are provided in the second hole section 0112 , and the length direction of the mud circulation holes 0113 are parallel to the axis of the second hole section 0112 .

[0037] The provision of multiple mud flow holes 0113 in this embodiment can ensure that the formation fluid sample flows smoothly through the mud one-way valve.

[0038] In one embodiment, when the limit member 014 is located inside the mud through hole, the length of the valve body 011 along the axial direction of the mud through hole is less than or equal to 15 mm; when the limit member 014 is partially located outside the mud through hole, the maximum length between one end of the valve body 011 and one end of the limit member 014 along the axial direction of the mud through hole is less than or equal to 15 mm; perpendicular to the axial direction of the mud through hole, the maximum diameter of the valve body 011 is less than or equal to 10 mm.

[0039] In this embodiment, along the axial direction of the mud through hole, the maximum length of the mud one-way valve is less than or equal to 15 mm. When the limit member 014 is located in the mud through hole, the maximum length of the mud one-way valve at this location is the length of the valve body 011. When the limit member 014 is partially located outside the mud through hole, the maximum length of the mud one-way valve at this location is the maximum value of the length between one end of the valve body 011 and one end of the limit member 014, that is, the length between the left end of the valve body 011 and the right end of the limit member 014.

[0040] Perpendicular to the axial direction of the mud through hole, the maximum diameter of the valve body 011 is less than or equal to 10 mm.

[0041] The volume of the mud check valve of this embodiment is relatively small. For a sampling tube with limited space, the smaller the volume of the mud check valve, the easier it is to install. Therefore, the mud check valve of this embodiment is relatively easy to install in the sampling tube.

[0042] In the prior art, conventional mud control valves are mostly gate valves, butterfly valves, ball valves, etc., with specifications ranging from DN15 to DN400. The mud control valves of these specifications are large in size and cannot be used in sampling tubes; the conventional hydraulic one-way valve has a minimum diameter of 5mm, but its medium is usually water, gas or oil with relatively high purity, and cannot be used in mud liquid environments with more impurities. The mud one-way valve of this embodiment is sealed by the sealing ring 015 on the one hand, and can still be sealed in the mud liquid environment, that is, it can be used in the mud liquid environment; on the other hand, the length of the mud one-way valve is less than or equal to 15mm, and the maximum diameter is less than or equal to 10mm, so the mud one-way valve of this embodiment is small in size and can be used in sampling tubes.

[0043] Finally, the mud one-way valve of the embodiment of the present invention can be made of high temperature and high pressure resistant materials, so that it can be used in ultra-high temperature and high pressure deep formation environment.

[0044] Among them, the outer side of the valve body 011 is provided with an external thread, and the valve body 011 is fixed in the sample flow channel of the sampling tube through the external thread.

[0045] The provision of the external thread in this embodiment facilitates fixing the mud one-way valve in the sample flow channel of the sampling tube.

[0046] The present invention also provides a sampling tube for a formation tester, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a sampling tube body 02 and a sampling tube cover 03 fixedly connected to the sampling tube body 02, a sample flow channel 031 is provided on the sampling tube cover 03, a mud one-way valve 01 is sealed and fixedly connected in the sample flow channel 031, the mud one-way valve 01 is as described in any of the above embodiments, and along the flow direction of the fluid sample, the first hole section is located upstream of the flow direction, and the second hole section is located downstream of the flow direction.

[0047] Specifically, the sampling tube of the embodiment of the present invention includes a sampling tube body 02 and a sampling tube cover 03, the sampling tube cover 03 and the sampling tube body 02 are sealed and fixedly connected, and a sample flow channel 031 is provided on the sampling tube cover 03, through which the fluid sample can be injected into the sampling tube body 02. The mud check valve 01 of any of the aforementioned embodiments is fixedly sealed and arranged in the sample flow channel 031, and the mud check valve 01, on the one hand, enables the mud to be injected into the sampling tube body 02 through it; on the other hand, through its reverse cut-off function, the mud cannot flow back from the sampling tube body 02 to the outside of the sampling tube body 02; that is, the installation of the mud check valve 01 has a directional requirement, and it can be known from the above that the mud can flow out smoothly through the mud through hole and the fluid through hole when the mud enters the mud check valve 01 from one end of the first hole section, so in this embodiment, along the flow direction of the fluid sample, the first hole section is located upstream of the flow direction, and the second hole section is located downstream of the flow direction.

[0048] Again, for the sampling tube of the embodiment of the present invention, when the sampling operation is carried out, the formation fluid sample enters the sample flow channel 031 through the fluid inlet 032 through the suction pump, and enters the sampling tube body 02 through the mud one-way valve 01 on the sample flow channel 031; after the sampling tube body 02 is filled with the fluid sample, the mud one-way valve 01 can ensure that the fluid sample injected into the sampling tube body 02 will not flow out of the sampling tube body 02; the pressure relief valve 06, the high-pressure manual valve 04 and the inspection port 05 can also be set on the sample flow channel 031 as needed.

[0049] The sampling tube of the embodiment of the present invention can achieve the purpose of successfully bringing the fluid sample in the sampling tube body 02 back to the ground in the event of a stop valve failure in the sample flow channel 031, thereby better ensuring the success rate of the sampling operation.

[0050] In one embodiment, the mud one-way valve 01 is threadedly connected to the sample circulation channel 031 , and the mud one-way valve 01 and the sample circulation channel 031 are sealed by a sealing structure 07 .

[0051] An embodiment of the present invention further provides a formation tester, which includes a sampling tube of the formation tester described in any one of the above.

[0052] The formation tester of the embodiment of the present invention can achieve the purpose of successfully bringing the fluid sample in the sampling tube body back to the ground in the event of a stop valve failure in the sample flow channel, thereby better ensuring the success rate of the sampling operation.

[0053] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0054] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A mud check valve, characterized in that: The valve body comprises a first hole section which is interconnected and a second hole section which has a hole diameter larger than that of the first hole section. The first hole section and the second hole section are connected to form a mud through hole which penetrates the valve body. The second hole section comprises a valve core and an elastic unit. The end of the second hole section which is away from the first hole section is connected to a limiting member. The limiting member comprises a fluid through hole which has an axis parallel to the axis of the mud through hole. The limiting member is used to limit the valve core and the elastic unit in the second hole section. The elastic unit is used to press the valve core against the bottom wall of the first hole section. The valve core can seal the mud through hole after being pressed against the bottom wall of the first hole section.

2. The mud one-way valve according to claim 1, characterized in that: The valve core includes a valve core body and a sealing ring, wherein the sealing ring is sleeved on the valve core body and located between the valve core body and the bottom wall of the first hole section. The elastic force of the elastic unit is used to cause the valve core body to squeeze the sealing ring toward the bottom wall of the first hole section so as to seal the mud through hole through the sealing ring.

3. The mud one-way valve according to claim 2, characterized in that: The valve core body includes a head and a tail, the diameter of the tail is larger than the aperture of the first hole section, the diameter of the head is smaller than the aperture of the first hole section, the tail and the sealing ring are both located in the second hole section, the sealing ring is sleeved on the head, and the outer diameter of the sealing ring is larger than the inner diameter of the first hole section, and the elastic unit is arranged between the tail and the limit member.

4. The mud one-way valve according to claim 1, characterized in that: A threaded hole is provided at one end of the second hole segment away from the first hole segment, the minor diameter of the threaded hole is larger than the hole diameter of the second hole segment, the limiting member is a limiting nut matched with the threaded hole; and the elastic element is a spring.

5. The mud one-way valve according to claim 1, characterized in that: The second hole section is provided with a plurality of mud flow holes whose length direction is parallel to the axis of the second hole section.

6. The mud one-way valve according to claim 1, characterized in that: When the limit member is located inside the mud through hole, the length of the valve body along the axial direction of the mud through hole is less than or equal to 15 mm; when the limit member is partially located outside the mud through hole, the maximum length between one end of the valve body and one end of the limit member along the axial direction of the mud through hole is less than or equal to 15 mm; perpendicular to the axial direction of the mud through hole, the maximum diameter of the valve body is less than or equal to 10 mm.

7. The mud one-way valve according to claim 1, characterized in that: The outer side of the valve body is provided with an external thread, and the valve body is fixed in the sample flow channel of the sampling cylinder through the external thread.

8. A sampling tube of a formation tester, characterized in that: It includes a sampling tube body and a sampling tube cover fixedly connected to the sampling tube body, the sampling tube cover is provided with a sample flow channel, a mud one-way valve is sealed and fixedly connected in the sample flow channel, the mud one-way valve is as described in any one of claims 1-7, and along the flow direction of the fluid sample, the first hole section is located upstream of the flow direction, and the second hole section is located downstream of the flow direction.

9. The sampling tube of the formation tester according to claim 8, characterized in that: The mud one-way valve is threadedly connected to the sample circulation channel, and the mud one-way valve and the sample circulation channel are sealed by a sealing structure.

10. A formation tester, characterized in that: A sampling tube comprising the formation tester according to any one of claims 8-9.

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