A field sampler for oil field exploration

Abstract

This utility model discloses an oilfield sampler for oilfield exploration, relating to the field of oilfield exploration equipment. It aims to solve the problems of unstable connection, poor sealing, low sampling accuracy, and inconvenient operation of existing samplers. The sampler includes a sampling rod, a sampling head, an operating rod, a sampling chamber, a limiting sleeve, a sealing cap, a threaded post, and a connecting sleeve. The operating rod drives the axial extension and retraction of the sampling rod. The sampling chamber has scale markings on its outer side to assist in depth judgment, and an anti-corrosion layer on its inner wall. The limiting sleeve and sealing cap are threadedly connected and equipped with a sealing ring to enhance sealing. The connecting sleeve and sampling head are detachably connected to adapt to different scenarios. Operating protrusions are provided on the outer side of the sealing cap and connecting sleeve for easy tightening. This utility model features a stable structure, reliable sealing, and convenient operation. It can accurately sample in layers, ensure oil sample purity, improve exploration efficiency, and has strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of oilfield exploration technology, specifically to an oilfield sampler used for oilfield exploration. Background Technology

[0002] In oilfield exploration, precise sampling and analysis of underground oil layers is a fundamental step in understanding key information such as the properties and oil content of the oil layers, supporting oilfield development decisions.

[0003] However, existing oilfield samplers have many shortcomings in practical applications: the connection between the operating rod and the sampling rod is mostly fixed or simple, lacking a reliable detachable structure. During frequent use and transport in complex field environments, loose connections can easily affect operation, or even cause parts to detach and become damaged, increasing equipment maintenance costs and the risk of failure. The mating parts of the limiting sleeve and sealing cap, as well as the overall sealing design of the sampler, are insufficient to effectively prevent external impurities and moisture from entering the sampling chamber. Oil samples may also leak during sampling and transfer, damaging the original state of the oil sample and interfering with the accuracy of subsequent analysis results. Furthermore, the sampling chamber directly contacts the oil sample, and existing materials and surface treatments are susceptible to contamination from the oil sample. Corrosive components can damage and deform the tank walls with prolonged use, shortening the sampler's lifespan and potentially contaminating the oil sample with debris, thus affecting the reliability of analytical data. During sampling, the lack of intuitive and precise depth markers makes it difficult for operators to accurately determine the sampling depth corresponding to the extension stroke of the sampling rod, forcing them to rely on experience or rough estimations. This leads to confusion between oil samples at different depths, failing to meet the requirements of stratified sampling for detailed exploration. Furthermore, the tightening and loosening of components such as sealing caps and connecting sleeves is limited by structural design. In field operations, the smooth surfaces and insufficient friction of these components can cause slippage and difficulty in tightening, affecting the smoothness of the sampling process.

[0004] Therefore, it is necessary to design an oilfield sampler for oilfield exploration to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide an oilfield sampler for oilfield exploration, so as to solve the problems of insufficient connection stability, poor sealing performance, weak corrosion resistance, ambiguous depth judgment, poor compatibility of sampling head and low ease of operation in the existing technology, and meet the needs of oilfield exploration for sampling accuracy, reliability and efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An oilfield sampler for oilfield exploration includes a sampling rod and a sampling head. An operating rod is connected to one axial side of the sampling rod for driving the sampling rod to extend and retract axially. A sampling chamber is provided on the outer side of the sampling rod. A limit sleeve is provided on one axial side of the sampling chamber. A sealing cap is threadedly connected to the limit sleeve. The sealing cap is sleeved and installed on the outer side of the sampling rod. A threaded post is provided on the other axial side of the sampling chamber. A connecting sleeve is threadedly connected to the side of the threaded post away from the sampling chamber.

[0008] Furthermore, the operating rod and the sampling rod are detachably connected. The end of the operating rod has a connecting protrusion, and the end of the sampling rod has a connecting groove that matches the connecting protrusion. The two are fixed together by a snap-fit ​​connection. This detachable snap-fit ​​structure ensures the stability of the connection between the operating rod and the sampling rod, and facilitates the disassembly, storage, and carrying of the equipment, making it particularly suitable for frequent movement and use in field exploration environments.

[0009] Furthermore, the limiting sleeve is a ring structure, with its inner wall slidingly engaging with the outer wall of the sampling rod. The outer wall of the limiting sleeve has external threads, and the inner wall of the sealing cap has internal threads that match the external threads. A sealing ring is provided at the threaded connection between the sealing cap and the limiting sleeve to enhance sealing performance. The sliding engagement between the limiting sleeve and the sampling rod does not affect the axial extension and retraction of the sampling rod, while the threaded sealing cap, in conjunction with the sealing ring, effectively prevents external impurities from entering the sampling chamber and prevents oil sample leakage, ensuring the purity and integrity of the oil sample.

[0010] Furthermore, the sampling chamber has a hollow cavity structure with an anti-corrosion layer on its inner wall. This anti-corrosion layer is made of at least one of polytetrafluoroethylene (PTFE) coating and epoxy resin coating, used to prevent oil samples from corroding the inner wall of the sampling chamber. The hollow cavity structure provides space for oil sample storage, while the anti-corrosion layer resists the erosion of corrosive components in the oil sample, extending the service life of the sampling chamber and preventing oil sample contamination due to damage to the chamber wall.

[0011] Furthermore, the outer wall of the sampling chamber is equipped with scale markings to assist in determining the sampling depth in conjunction with the extension and retraction stroke of the sampling rod. Operators can visually grasp the extension and retraction distance of the sampling rod by observing the relative position of the scale markings and the sampling rod, thereby accurately determining the sampling depth, meeting the needs of stratified sampling, and improving the scientific accuracy of the sampling data.

[0012] Furthermore, the end of the connecting sleeve furthest from the threaded post is provided with an internal thread, and the end of the sampling head is provided with an external thread adapted to the internal thread. The sampling head and the connecting sleeve are detachably connected by threads, and the sampling head has a conical structure with several sampling holes at its end, which communicate with the internal cavity of the sampling chamber. The detachable design of the threaded connection allows the sampling head to be flexibly replaced according to different geological conditions; the conical structure facilitates the insertion of the sampling head into the formation, and the sampling holes enable efficient collection of oil samples and introduction into the sampling chamber, improving sampling efficiency.

[0013] Furthermore, the outer wall of the sealing cap and the connecting sleeve is provided with operating protrusions, which are evenly distributed around the circumference of the sealing cap and the connecting sleeve to facilitate the operator in screwing on the sealing cap and the connecting sleeve. The operating protrusions increase the friction between the hand and the parts, allowing the operator to easily screw on the sealing cap and the connecting sleeve even when their hands are wet or they are wearing gloves during field operations, simplifying the operation process and improving work efficiency.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model, through the design of an oilfield sampler for oilfield exploration, achieves the following effects: 1. The operating rod and sampling rod adopt a detachable snap-fit ​​structure, with the connecting protrusion and connecting groove fitting together. This facilitates the assembly, disassembly, storage, and transportation of the equipment, and ensures a quick and stable connection during use, preventing operational errors and component damage caused by loose connections, and guaranteeing reliable operation in complex field environments; 2. A sealing ring is added to the threaded connection between the limiting sleeve and the sealing cover. Combined with the tightness of the threaded connection, this significantly improves the sealing effect of the sampling chamber, effectively blocking external impurities and moisture intrusion, preventing oil sample leakage, and ensuring that the oil sample remains in its original state during sampling, storage, and transfer, providing a reliable sample for subsequent accurate analysis; 3. The inner wall of the sampling chamber is coated with a polytetrafluoroethylene coating or an epoxy resin coating, etc., to resist the erosion of corrosive components in the oil sample, delaying the aging and damage rate of the sampling chamber, and extending its service life. 4. The outer wall of the sampling chamber is equipped with scale markings that are linked to the extension and retraction stroke of the sampling rod. This allows operators to intuitively and accurately determine the sampling depth, meeting the needs of fine exploration for stratified sampling of oil layers at different depths, avoiding oil sample confusion, and improving the scientific rigor and reliability of sampling. 5. The connecting sleeve and sampling head are connected by a threaded detachable connection, facilitating the flexible replacement of sampling heads with different structures (such as conical shapes) and sampling hole designs according to actual geological conditions and oil layer conditions. This adapts to diverse sampling scenarios, reduces problems such as sampling hole blockage and insufficient sampling, and improves sampling efficiency and quality. 6. The sealing cap and the outer wall of the connecting sleeve are equipped with circumferentially evenly distributed operating protrusions to increase friction during screwing operations. This allows operators to screw on components more easily and stably during field operations, avoiding slippage and operational difficulties, optimizing the sampling operation process, and improving overall work efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the planar structure of this utility model;

[0018] Figure 3 This utility model Figure 2 A schematic diagram of the internal structure of a part.

[0019] In the diagram: 1. Sampling rod; 2. Sampling head; 3. Operating rod; 4. Sampling chamber; 5. Limiting sleeve; 6. Sealing cap; 7. Threaded post; 8. Connecting sleeve; 9. Sealing ring; 10. Scale markings; 41. Anti-corrosion layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] Example 1

[0023] Please see Figure 1 This embodiment provides an oilfield sampler for oilfield exploration, including a sampling rod 1 and a sampling head 2. An operating rod 3 is connected to one axial side of the sampling rod 1. The operating rod 3 is used to drive the sampling rod 1 to extend and retract axially. A sampling chamber 4 is provided on the outer side of the sampling rod 1. A limit sleeve 5 is provided on one axial side of the sampling chamber 4. A sealing cover 6 is threadedly connected to the limit sleeve 5. The sealing cover 6 is sleeved and installed on the outer side of the sampling rod 1. A threaded post 7 is provided on the other axial side of the sampling chamber 4. A connecting sleeve 8 is threadedly connected to the side of the threaded post 7 away from the sampling chamber 4.

[0024] Example 2

[0025] Please see Figure 1 as well as Figure 2 Based on Embodiment 1, this embodiment further defines the operating rod 3 and the sampling rod 1 as detachably connected. The end of the operating rod 3 is provided with a connecting protrusion, and the end of the sampling rod 1 is provided with a connecting groove that matches the connecting protrusion. The two are fixed by snap-fit. This connection method does not require additional tools and can be quickly assembled and disassembled during field operations, greatly reducing the volume of the equipment when carried and improving transportation convenience.

[0026] Example 3

[0027] Please see Figure 1 as well as Figure 2Based on Example 1, this embodiment further defines the limiting sleeve 5 as a ring structure, with its inner sidewall slidingly engaging with the outer sidewall of the sampling rod 1. This ensures that the sampling rod 1 maintains a stable trajectory during axial extension and retraction, avoiding deviation that could affect sampling accuracy. The outer sidewall of the limiting sleeve 5 is provided with an external thread, and the inner sidewall of the sealing cover 6 is provided with an internal thread that matches the external thread. A sealing ring 9 is provided at the threaded connection between the sealing cover 6 and the limiting sleeve 5. Through the tight engagement of the threads and the sealing effect of the sealing ring 9, external mud and water can be effectively prevented from entering the sampling chamber 4, while also preventing oil sample leakage and ensuring the purity and integrity of the oil sample.

[0028] Example 4

[0029] Please see Figure 3 Based on Example 1, this embodiment further defines the sampling chamber 4 as a hollow cavity structure, with an anti-corrosion layer 41 on its inner wall. In this embodiment, the anti-corrosion layer 41 is made of polytetrafluoroethylene coating, which has excellent chemical corrosion resistance and non-stick properties. It can resist the erosion of corrosive components such as acids and alkalis in the oil sample, avoid rust and damage to the inner wall of the sampling chamber 4, extend the service life of the equipment, and prevent debris from the chamber wall from mixing into the oil sample, ensuring the accuracy of subsequent analysis data.

[0030] Example 5

[0031] Please see Figure 2 Based on Example 1, this embodiment further specifies that the outer wall of the sampling chamber 4 is provided with a scale mark 10. The minimum division value of the scale mark 10 is 1cm. When the operator drives the sampling rod 1 to extend or retract, he / she can observe the relative position change between the scale mark 10 and the sampling rod 1 to judge the sampling depth in real time and accurately, so as to easily achieve layered sampling of oil layers at different depths and avoid the problem of oil sample confusion caused by depth estimation error in traditional sampling.

[0032] Example 6

[0033] Please see Figure 1 Based on Embodiment 1, this embodiment further specifies that the end of the connecting sleeve 8 away from the threaded post 7 is provided with an internal thread, and the end of the sampling head 2 is provided with an external thread adapted to the internal thread. The sampling head 2 and the connecting sleeve 8 are detachably connected by the thread. When facing different geological conditions (such as loose strata and dense strata), the appropriate sampling head 2 can be quickly replaced. In this embodiment, the sampling head 2 has a conical structure. The conical design can reduce the resistance when the sampling head 2 is inserted into the strata, making it easier to penetrate into the oil layer. The end of the sampling head 2 is provided with 4 evenly distributed sampling holes with a diameter of 5mm. The sampling holes are connected to the internal cavity of the sampling chamber 4, which can efficiently collect oil samples and quickly introduce them into the sampling chamber 4, thereby improving sampling efficiency.

[0034] Example 7

[0035] Please see Figure 1 Based on Embodiment 1, this embodiment further specifies that both the sealing cap 6 and the connecting sleeve 8 have operating protrusions on their outer walls. The height of the operating protrusions is 3mm and the width is 5mm. There are 6 operating protrusions evenly distributed around the sealing cap 6 and the connecting sleeve 8. The operating protrusions can greatly increase the friction between the hand and the parts. Even if the operator is wearing gloves or has wet hands, they can easily screw the sealing cap 6 and the connecting sleeve 8, avoid slipping, and simplify the sampling operation process.

[0036] The working process of this utility model is as follows: When using the oilfield sampler for oilfield exploration, firstly, the operating rod 3 is fixed by engaging the connecting groove of the sampling rod 1 with the end connecting protrusion to ensure a stable connection between the two; then, the sampling head 2 is connected by screwing the external thread of the end to the internal thread of the connecting sleeve 8. When screwing, the operating protrusion on the outside of the connecting sleeve 8 is used to quickly complete the assembly; finally, check the threaded connection status of the sealing cover 6 and the limiting sleeve 5, confirm that the sealing ring 9 is undamaged, ensure the initial sealing performance of the sampling chamber 4, observe the scale markings 10 on the outer wall of the sampling chamber 4, record the scale value corresponding to the initial position of the sampling rod 1, determine the target sampling depth according to the exploration requirements, and clarify the travel range of the sampling rod 1 that needs to be extended and retracted.

[0037] During sampling, hold the operating lever 3 and align the conical sampling head 2 with the oil layer to be sampled. Slowly press down to insert the sampling head 2 into the formation. The conical design reduces insertion resistance and ensures that the sampling head 2 reaches the target oil layer area smoothly. Drive the sampling rod 1 to extend and retract axially through the operating lever 3. The sampling rod 1 moves stably under the sliding fit of the inner wall of the limiting sleeve 5. When the sampling rod 1 extends and retracts to the target depth (confirmed by the scale mark 10), the formation oil sample enters the sampling chamber 4 through the sampling hole at the end of the sampling head 2. The hollow cavity structure of the sampling chamber 4 provides storage space for the oil sample. The anti-corrosion layer 41 on the inner wall prevents the oil sample from reacting with the chamber wall. After the sampling is completed, reverse the driving lever 3 to reset the sampling rod 1. Then, with the help of the operating protrusion on the outside of the sealing cover 6, tighten the threaded connection between the sealing cover 6 and the limiting sleeve 5. The sealing ring 9 further enhances the sealing effect to prevent the oil sample from leaking or being contaminated during the extraction process.

[0038] After sampling is completed, hold the operating lever 3 and slowly pull the sampler out of the formation to avoid the oil sample in the sampling chamber 4 from shaking and overflowing due to excessive speed. Use the operating protrusion to loosen the sealing cap 6 and transfer the oil sample in the sampling chamber 4 to a special storage container. Then disassemble the operating lever 3 and the sampling head 2, and clean the sampling rod 1, sampling chamber 4, sealing cap 6 and other components, especially cleaning the residual oil sample on the inner wall of the sampling chamber 4 to ensure that the equipment can be reused.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oilfield sampler for oilfield exploration, comprising a sampling rod (1) and a sampling head (2), characterized in that: The sampling rod (1) is connected to an operating rod (3) on one axial side for driving the sampling rod (1) to extend and retract axially. A sampling chamber (4) is provided on the outside of the sampling rod (1). A limiting sleeve (5) is provided on one axial side of the sampling chamber (4). A sealing cover (6) is threaded onto the limiting sleeve (5). The sealing cover (6) is sleeved and installed on the outside of the sampling rod (1). A threaded post (7) is provided on the other axial side of the sampling chamber (4). A connecting sleeve (8) is threaded onto the side of the threaded post (7) away from the sampling chamber (4).

2. The oilfield sampler for oilfield exploration according to claim 1, characterized in that: The operating rod (3) and the sampling rod (1) are detachably connected. The end of the operating rod (3) is provided with a connecting protrusion, and the end of the sampling rod (1) is provided with a connecting groove that matches the connecting protrusion. The two are fixed by snap-fit.

3. The oilfield sampler for oilfield exploration according to claim 1, characterized in that: The limiting sleeve (5) is a ring structure, and its inner sidewall is slidably fitted with the outer sidewall of the sampling rod (1). The outer sidewall of the limiting sleeve (5) is provided with an external thread, and the inner sidewall of the sealing cover (6) is provided with an internal thread that matches the external thread. A sealing ring (9) is provided at the threaded connection between the sealing cover (6) and the limiting sleeve (5) to enhance the sealing performance.

4. An oilfield sampler for oilfield exploration according to claim 1, characterized in that: The sampling chamber (4) is a hollow cavity structure, and its inner wall is provided with an anti-corrosion layer (41). The anti-corrosion layer (41) is made of at least one of polytetrafluoroethylene coating and epoxy resin coating, which is used to prevent oil sample from corroding the inner wall of the sampling chamber (4).

5. An oilfield sampler for oilfield exploration according to claim 1, characterized in that: The outer wall of the sampling chamber (4) is provided with scale markings (10) to assist in judging the sampling depth in conjunction with the extension and retraction stroke of the sampling rod (1).

6. An oilfield sampler for oilfield exploration according to claim 1, characterized in that: The connecting sleeve (8) has an internal thread at one end away from the threaded post (7), and the sampling head (2) has an external thread at the end that is compatible with the internal thread. The sampling head (2) and the connecting sleeve (8) are detachably connected by threads. The sampling head (2) has a tapered structure and has several sampling holes at its end. The sampling holes are connected to the internal cavity of the sampling chamber (4).

7. An oilfield sampler for oilfield exploration according to claim 1, characterized in that: The outer walls of the sealing cap (6) and the connecting sleeve (8) are provided with operating protrusions. The operating protrusions are evenly distributed around the sealing cap (6) and the connecting sleeve (8) to facilitate the operator to screw the sealing cap (6) and the connecting sleeve (8).

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