CN210858711U

CN210858711U - Underground sampling device

Info

Publication number: CN210858711U
Application number: CN201921541912.4U
Authority: CN
Inventors: 李建雄; 户贵华; 魏世举; 王长庚; 彭红波; 许刚
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-26
Anticipated expiration: 2029-09-17

Abstract

The utility model relates to an oil development equipment technical field, concretely relates to sampling device in pit. The downhole sampling device comprises: the sampling cylinder and the sealing cover component are arranged on the sampling cylinder, the sealing cover component comprises a piston and a cylinder sleeve, a liquid inlet flow passage is arranged in the piston, and a one-way valve is arranged in the liquid inlet flow passage; the liquid inlet flow passage is provided with an inlet, the cylinder sleeve is provided with a sampling hole, the cylinder sleeve is provided with a plugging section capable of plugging the inlet, the sampling hole is arranged above or below the plugging section, the plugging section and the inlet of the capping component are correspondingly distributed to prevent liquid from entering a closed state in the sample storage cavity, the inlet and the plugging section are distributed in a staggered mode and are communicated with the sampling hole, and the capping component comprises a shear pin for fixing a piston and the cylinder sleeve to keep the capping component in the closed state; one of the piston and the cylinder sleeve is a fixed part, the other one is a movable part, the movable part is positioned above the sampling cylinder at intervals, the upper end of the movable part protrudes out of the fixed part, and the movable part can bear the impact of falling objects thrown into the underground pipe column from the ground to shear the shear pin and move downwards.

Description

Underground sampling device

Technical Field

The utility model relates to an oil development equipment technical field, concretely relates to sampling device in pit.

Background

The oil field downhole environment is complex, and in order to better realize the monitoring and management of the oil field, samples at specific depths are often required to be taken out, the properties and components of downhole fluids are analyzed, and a basis is provided for oil field development or medicament compatibility. At present, the downhole sampling device has two types of electric and mechanical devices. The electric type motor is high in reliability, complex in structure, and generally needs to be matched with a matched tool for use, so that the motor is more limited in use and higher in cost, and the cost is more than 4 ten thousand yuan. And the mechanical type structure is shown as the chinese utility model patent of the bulletin number CN208220773U, and it specifically includes the top connection, and top connection lower extreme inside is fixed with central bucket, and the lower extreme external fixation has the cylinder body, installs the piston section of thick bamboo between central bucket and the cylinder body with axial displacement, has the spring between piston section of thick bamboo bottom and the cylinder body, has the first through-hole of leading liquid to piston section of thick bamboo top on the central bucket, has the second through-hole on the cylinder body, has the third through-hole on the section of thick bamboo wall of piston section of thick bamboo. A collecting barrel is arranged below the cylinder body, and a flow passage communicated with the collecting barrel is arranged between the piston cylinder and the central barrel. During the use, connect oil pipe on the last joint, transfer sampling device to the position of setting for in the pit through oil pipe, then well head pump liquid, liquid drive piston cylinder moves down, makes second through-hole and third through-hole intercommunication, and liquid in the pit flows into the collecting vessel through second through-hole, third through-hole and runner in, and the well head stops to suppress the back piston cylinder and resets under the spring action, guarantees the leakproofness of collecting vessel.

In the prior art, the mechanical sampling device needs to adopt an oil pipe to put down, and even needs to adopt a wellhead hydraulic driving mode to drive sampling, so that the whole operation cost is higher, and the operation and tool cost is more than 3 ten thousand yuan.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sampling device in pit to the sampling device in pit who solves among the prior art need transfer and lead to the higher technical problem of working costs with oil pipe.

In order to achieve the above object, the utility model discloses sampling device's technical scheme is in the pit: a downhole sampling device, comprising:

the sampling tube is put into the underground pipe column when in use, a sample storage cavity is arranged in the sampling tube, the lower end of the sampling tube is closed, and the sampling tube is supported on a support table in the underground pipe column when in use;

the sealing cover assembly is arranged at the upper end of the sampling cylinder and comprises a piston and a cylinder sleeve which are in sealing sliding fit, a liquid inlet flow channel connected with the sample storage cavity is arranged in the piston, and a one-way valve for liquid to enter the sample storage cavity is arranged in the liquid inlet flow channel;

the liquid inlet flow passage is provided with an inlet extending to the periphery of the piston, the cylinder sleeve is provided with a sampling hole, the cylinder sleeve is provided with a plugging section capable of plugging the inlet, the sampling hole is arranged above or below the plugging section, the plugging section and the inlet of the sealing cover assembly are correspondingly distributed to prevent liquid from entering a closed state in the sample storage cavity, the inlet and the plugging section are distributed in a staggered mode and communicated with the sampling hole in a sampling state, the sealing cover assembly comprises a shear pin for fixing the piston and the cylinder sleeve to keep the sealing cover assembly in the closed state, and the shear pin can be sheared when the piston and the cylinder sleeve are stressed to move relatively and the sealing cover assembly is placed in the sampling state;

one of the piston and the cylinder sleeve is a fixed part fixedly arranged on the sampling cylinder, the other one is a movable part, the movable part is positioned above the sampling cylinder at intervals, the upper end of the movable part protrudes out of the fixed part, the movable part can bear the impact of falling objects thrown into the underground pipe column from the ground to shear the shear pins and move downwards, and when the cylinder sleeve is the movable part, the cylinder sleeve comprises a top plate positioned above the piston at intervals, and the top plate is used for bearing the impact force.

The utility model has the advantages that: the utility model discloses a mode that sampling device adopted ground to throw the junk striking and open in the pit, can drop into sampling device in the pit directly by the present tubular column in the pit during use, sampling device stops when meetting the brace table (for example cross on the oil pipe or plug etc.) in the tubular column in the pit, then drop by the well head drops into the junk again, junk striking moving part, the moving part downshifts and cuts the shear pin, liquid passes through the thief hole in the pit, the import, the feed liquor runner promotes during the check valve gets into sample storage chamber, liquid in the sample storage chamber reaches after the certain degree, the inside and outside pressure differential of sample storage chamber is less than the opening pressure of check valve, the check valve is closed, make sampling device keeps sealing in the pit. The utility model discloses a sampling device utilizes current tubular column in the pit to carry out the fixed point sample, need not go into oil pipe under specially for the sample, simple structure, and convenient operation has saved oil pipe's operating cost down, and sampling device in the pit does not influence the normal use of tubular column in the pit in addition yet.

Further, the sampling holes comprise at least two circumferential sampling holes arranged on the cylinder liner at intervals along the circumferential direction. The arrangement of the plurality of circumferential sampling holes can improve the liquid entering speed.

Further, the circumferential sampling hole is a long hole extending along the up-down direction or extending along the circumferential direction. The circumferential sampling holes are designed into long holes, so that the liquid entering speed can be further improved.

Furthermore, the cylinder sleeve comprises a plugging section matched with the piston in a sliding sealing mode, and a hole expanding section which is located above or below the plugging section and has an inner diameter larger than that of the plugging section is further arranged, and the circumferential sampling hole is formed in the hole expanding section. After the reaming section is arranged, the inlet on the piston is communicated with the circumferential sampling hole through the annular space between the cylinder sleeve and the piston, the up-down correspondence between the inlet and the circumferential sampling hole is not required to be particularly ensured, and the structure is simpler.

Further, the piston is fixedly installed on the sampling tube, the reaming section is located the top of shutoff section, and the thief hole still includes the top thief hole of locating on the roof. Through setting up the top thief hole, can further improve the speed of feed liquor.

Further, the lower end of the piston is fixedly arranged in the sampling cylinder, and the upper end of the sampling cylinder is provided with an annular stop surface for limiting the downward movement limit of the cylinder sleeve. After the annular stop surface is arranged, the downward movement limit of the cylinder sleeve is limited, and the cylinder sleeve is prevented from being separated from the piston and even the sampling cylinder.

Furthermore, the sampling tube comprises a tube body with openings at two ends, the sealing cover assembly is installed at one end of the tube body, the pressure release valve is installed at the other end of the tube body and comprises a valve body fixedly installed on the tube body, and a pressure release flow channel and a valve core for controlling the on-off of the pressure release flow channel are arranged in the valve body. After the pressure relief valve is arranged, when the underground sampling device is lifted to the ground and then is sampled, the pressure relief is firstly carried out, high-pressure gas in oil gas in liquid is discharged, the waste of the liquid caused by the ejection of the high-pressure gas is prevented, and meanwhile, the injury is caused to operators.

Further, the pressure relief flow channel extends up and down, the pressure relief flow channel comprises a first section connected with the sample storage cavity and a second section connected with the exterior of the underground sampling device, and the first section and the second section are arranged along the transverse dislocation. First, second section horizontal dislocation is arranged, can not directly spout when guaranteeing high-pressure gas blowout, need buckle and spray, can reduce the speed of spraying, avoids causing the injury to operating personnel.

Furthermore, a valve core mounting hole for mounting the valve core is formed in the valve body, the valve core mounting hole transversely penetrates through the valve body and is communicated with the first section and the second section, and an annular pressure relief groove capable of being communicated with the first section and the second section is formed in the valve core. The valve core mounting hole penetrates through the valve body, the valve core mounting hole is convenient to process, the annular pressure relief groove is used for communicating and relieving pressure, and liquid leakage is avoided, so that liquid waste is avoided.

Further, the outer diameter of the downhole sampling device is adapted to be smaller than the inner diameter of the downhole string and an annular flow passage is formed between the downhole sampling device and the downhole string. After forming the annular runner for sampling device's existence can not cause the influence to the normal production operation of tubular column in the pit, treat that tubular column operation in the pit accomplishes lift in the pit when take out sampling device in the pit can, need not salvage sampling device in the pit once more.

Drawings

Fig. 1 is a schematic view of an embodiment 1 of the downhole sampling device of the present invention;

description of reference numerals: 100-a sampling tube; 11-a barrel body; 12-a pressure relief valve; 121-a valve body; 122-upper pressure relief section; 123-a lower pressure relief section; 124-valve core perforation; 125-a valve core; 126-through slots; 127-a drainage groove; 128-spool seal ring; 200-a closure assembly; 21-cylinder liner; 22-a piston; 23-circumferential sampling holes; 24-top sampling hole; 25-piston seal ring; 26-shear pins; 27-a valve ball; 28-a spring; 29-diversion holes; 210-a valve housing; 211-internal thread; 212-a valve port; 213-shear pin hole.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The utility model discloses a sampling device in pit can utilize the existing tubular column in pit to support and set for the degree of depth position in the well, utilizes the mode that sucker rod or other junk were thrown on ground to open and take a sample, can realize self-sealing after the sample is accomplished.

Embodiment 1 of the downhole sampling device, as shown in fig. 1, the downhole sampling device is placed in the same manner as in fig. 1 in use, extending up and down. The underground sampling device integrally comprises a sampling cylinder 100 and a sealing cover assembly 200 installed on the sampling cylinder 100, a sample storage cavity is formed in the sampling cylinder 100, a liquid inlet flow channel communicated with the sample storage cavity is formed in the sealing cover assembly 200, a one-way valve is arranged in the liquid inlet flow channel, liquid can enter the sample storage cavity in a one-way mode through the one-way valve, the sealing cover assembly 200 comprises a piston 22 and a cylinder sleeve 21, the liquid inlet flow channel can be communicated with the underground after the cylinder sleeve 21 is hit by falling objects on the ground, sampling is achieved, and after sampling is completed, the liquid inlet flow channel is sealed through the one-way valve to prevent the sample from flowing out.

The sampling tube 100 is structured as shown in fig. 1, the sampling tube 100 includes a tube body 11 and a pressure release valve 12, the tube body 11 is open at both axial ends, the lower end opening is closed by the pressure release valve 12, and the upper end opening is closed by a cover assembly 200.

The closing cap assembly 200 comprises a cylinder sleeve 21 and a piston 22, the cylinder sleeve 21 is integrally a cylinder body with a closed top, the inner diameter of the cylinder sleeve 21 is large at the top and small at the bottom, a circumferential sampling hole 23 is formed in a large hole section at the upper part of the cylinder sleeve, a plurality of circumferential sampling holes 23 are distributed at intervals along the circumferential direction, the upper end of the cylinder sleeve 21 is a top plate, and a top sampling hole 24 is also formed in the top plate. The lower small bore section of the cylinder liner 21 is actually a plugging section, and the inner diameter of the end is consistent with the outer diameter of the piston 22, so that the end can be in sliding sealing fit with the piston 22.

In this embodiment, set up the inlet channel of T shape on piston 22, wherein the inlet channel includes vertical section and horizontal section, and horizontal section is worn out and has formed the import by wearing out on piston 22's the periphery, has seted up the annular on piston 22 on the upper and lower both sides of import and has embedded piston seal 25 in the annular, when the import was located the aperture section of cylinder liner 21, relied on piston seal 25 and can carry out the shutoff to the import. Two steps are arranged below the vertical section of the liquid inlet flow channel, the step above is a conical step, the upper part is small and the lower part is large, and a valve port 212 is formed. In this embodiment, a check valve is installed in the vertical section of the liquid inlet flow channel, specifically, an internal thread 211 is processed at the lower end of the piston 22, a valve cover 210 is installed on the internal thread 211 in a threaded manner, a valve ball 27 and a spring 28 are sequentially arranged between the valve cover 210 and the valve port 212 from top to bottom, and the spring 28 is actually a compression spring. The valve port 212 can be closed by the support of the valve cover 210. In this embodiment, the inlet channel further includes a guiding hole 29 on the sidewall of the valve cover 210.

In this embodiment, the piston 22 and the cylinder liner 21 are relatively fixed by the shear pin 26, the shear pin 26 is installed in a manner that a blind hole is formed in the periphery of the piston 22, a penetrating shear pin hole 213 is formed in the cylinder liner 21, the shear pin hole 213 is actually a threaded hole, the shear pin 26 has an external thread, and during assembly, the shear pin 26 is screwed into the shear pin hole 213 and the blind hole of the piston 22 from the outside of the cylinder liner 21 to prevent the piston 22 and the cylinder liner 21 from moving up and down relatively. The assembled state of the piston 22 and the cylinder liner 21 is shown in fig. 1, in which the top plate of the cylinder liner 21 is located above the piston 22 and a sliding distance is provided therebetween. After the assembly is in place, the inlet of the liquid inlet flow passage in the piston 22 is sealed by the small hole section of the cylinder sleeve 21 and cannot be communicated with the outside, and the circumferential sampling hole 23 and the top sampling hole 24 are positioned above the inlet.

During assembly, the piston 22 of the capping assembly 200 is threadedly mounted inside the barrel 11, the bottom of the cylinder liner 21 is located above the sampling tube 100, there is a sliding distance therebetween, and the top of the sampling tube 100 has an annular stop surface capable of stopping the limit of downward movement of the cylinder liner 21.

The structure of the relief valve 12 is as shown in fig. 1, the relief valve 12 includes a valve body 121, a relief flow passage is formed in the valve body 121, and a valve core through hole 124 intersecting the relief flow passage is further formed, the relief flow passage extends vertically through the valve body 121, and the valve core through hole 124 transversely penetrates through the valve body 121.

In this embodiment, the pressure relief flow path includes an upper pressure relief section 122 at the upper side and a lower pressure relief section 123 at the lower side, and as can be seen from fig. 1, the upper pressure relief section 122 and the lower pressure relief section 123 are arranged in a staggered manner in the transverse direction. A spool 125 is threadedly installed in the spool through hole 124, and two spool sealing rings 128 are disposed at the front end of the spool 125 along the axial direction of the spool 125, and the spool sealing rings 128 can separate the upper pressure relief section 122 from the lower pressure relief section 123, and prevent liquid leakage. An annular relief groove 127 is formed in the valve core 125, and the transverse length of the relief groove 127 is greater than the distance between the upper relief section 122 and the lower relief section 123, but may be equal to that in other embodiments, so that the relief groove 127 can communicate the upper relief section 122 and the lower relief section 123. The end of the valve core 125 is provided with a straight through groove 126, which facilitates an external wrench to drive the valve core 125 to rotate.

In this embodiment, the overall outside diameter of the downhole sampling device is smaller than the inside diameter of the downhole string, and an annular flow passage is provided between the downhole sampling device and the downhole string.

The utility model discloses a use as follows: the present embodiment utilizes current tubular column in the pit, for example bailing tubular column or relevant transport perforation tubular column, if have plug etc. in the tubular column can support sampling device's in the pit supporting bench, utilize the brace table in the tubular column, if do not have in the tubular column from taking the brace table, then can support sampling device in the pit as a brace table at oil pipe internal fixation cross. When the device is used, the depth of the underground pipe column is adjusted to the sampling depth, the underground sampling device is put into a well, after the underground sampling device is put in place, a sucker rod is put into an oil pipe again, the sucker rod falls down to impact the cylinder sleeve 21, the cylinder sleeve 21 shears the shear pin 26 and then goes down, and the inlet of the liquid inlet flow channel is communicated with the circumferential sampling hole 23 and the top sampling hole 24 through the annular space between the cylinder sleeve 21 and the piston 22. Then the liquid in the well pushes away the check valve under the difference of internal pressure and external pressure and enters the sample storage cavity, when the liquid in the sample storage cavity increases to a certain amount, the difference of internal pressure and external pressure can not push away the check valve, at the moment, the check valve plugs the liquid inlet flow passage, and the internal liquid and the external liquid are prevented from flowing mutually. The underground pipe column can continue to carry out corresponding operation, and the underground sampling device is taken out when the underground pipe column is lifted. When the underground sampling device is disassembled to recover liquid, the pressure is required to be firstly released because the liquid in the sample storage cavity contains high-pressure gas. During pressure relief, the valve core 125 is rotated to communicate the upper pressure relief section 122, the flow relief groove 127 and the lower pressure relief section 123, so as to vent out high-pressure gas in the liquid in the sample storage cavity, and then the cover assembly 200 is detached to recover the liquid. Of course, if the amount of liquid is small, the liquid may be recovered by the relief valve 12.

In this embodiment, the piston 22 is fixedly mounted on the sampling cylinder 100, thereby constituting a fixed member, and the cylinder liner 21 is movable relative to the sampling cylinder 100, thereby constituting a movable member.

In this embodiment, the circumferential sampling holes 23 and the top sampling holes 24 are sampling holes.

In this embodiment, when the shear pin 26 is not sheared, the cap assembly 200 is in a closed state to prevent downhole fluid from entering the sample storage chamber. When the shear pin 26 is sheared, external fluid can enter the sample storage chamber, and the cap assembly 200 is in a sampling state.

In this embodiment, the circumferential sampling hole 23 is a long hole extending vertically, which can increase the flow area of the circumferential sampling hole 23, and of course, in other embodiments, the circumferential sampling hole may be a long hole extending circumferentially. Of course, in other embodiments, the number and shape of the circumferential sampling holes may be varied according to the actual circumstances.

In this embodiment, the small bore section in the cylinder liner 21 is used to form a sealing section in sliding sealing engagement with the piston 22, and the large bore section forms the reaming section.

In this embodiment, a valve port is formed by a step of a vertical section in the liquid inlet flow passage, and a spring and a valve ball are installed by matching with a valve cover in the check valve.

The utility model discloses sampling device's concrete embodiment 2 in the pit, above-mentioned embodiment, the pressure release runner is formed by two sections of dislocation arrangement, and in this embodiment, both ends in the pressure release runner can correspond from top to bottom. Moreover, the extending direction of the pressure relief flow channel can be changed according to the actual situation, for example, the pressure relief flow channel can be a bent flow channel.

The utility model discloses sampling device's concrete embodiment 3 in the pit, in the above-mentioned embodiment, the hole of installation case is perforated for the case that runs through the valve body, consequently, must set up at least twice sealing washer and guarantee the disconnection between two sections, avoids liquid leakage simultaneously, in this embodiment, can be the blind hole with the hole design of installation case, and at this moment, only need last pressure release section with under set up one sealing washer between the pressure release section can. In addition, in the embodiment, the annular pressure relief groove on the valve core can be eliminated, and the valve core is moved outwards during pressure relief, so that the upper pressure relief section and the lower pressure relief section are communicated through the hole for installing the valve core.

The utility model discloses sampling device's concrete embodiment 4 in the pit, in the above-mentioned embodiment, the sampler barrel comprises barrel and relief valve, and liquid can not spray when the effect of relief valve is in order to guarantee to take out liquid, if only need not the purpose that oil pipe transferred in order to realize sampling device in the pit, can cancel the relief valve, with the structure of sampler barrel design formula as an organic whole, the upper end opening of sampler barrel, the lower extreme is sealed.

The utility model discloses sampling device's embodiment 5 in the pit, in embodiment 1, realizes the intercommunication through the annular space between cylinder liner and the piston between the import of feed liquor runner and the thief hole, in this embodiment, can cancel one of them cancellation in circumference thief hole and the top thief hole. When the circumference thief hole is kept, the cylinder liner hole can be for straight hole, as long as guarantee that circumference thief hole corresponds just can realize the corresponding intercommunication of import and circumference thief hole with the import of inlet channel on the upper and lower direction. At this moment, when the circumference thief hole is the thief hole of extending from top to bottom or circumference extension, can increase the corresponding area between circumference thief hole and the import, improve the speed that liquid got into.

The utility model discloses sampling device's in the pit concrete embodiment 6, above-mentioned each embodiment, the piston has constituted the mounting, and the cylinder liner has constituted the moving part. In this embodiment, the cylinder liner is fixedly mounted on the sampling tube to form a fixed part, the piston is mounted on the cylinder liner through the shear pins to form a movable part, at this time, the upper end of the piston protrudes upwards from the cylinder liner to bear external force impact, and a sliding distance is formed between the lower end of the piston and the sampling tube to allow the piston to move downwards. At this time, the sampling holes include only circumferential sampling holes, which are located below the inlet. In order to ensure that the circumferential sampling holes correspond to the inlets, the sampling cylinder is provided with a stop member for limiting the downward movement limit of the piston, and the stop member is required to be provided with a through hole for liquid to pass through.

Claims

1. A downhole sampling device, comprising:

2. The downhole sampling device of claim 1, wherein the sampling bore comprises at least two circumferential sampling bores circumferentially spaced apart in the cylinder casing.

3. The downhole sampling device of claim 2, wherein the circumferential sampling hole is an elongated hole extending in an up-down direction or extending in a circumferential direction.

4. A downhole sampling device according to claim 2 or 3, wherein the cylinder sleeve comprises the plugging section in sliding sealing fit with the piston, and a reaming section with an inner diameter larger than that of the plugging section is further provided above or below the plugging section, and the reaming section is provided with the circumferential sampling hole.

5. The downhole sampling device of claim 4, wherein the plunger is fixedly mounted on the sampling tube, the reaming section is positioned above the plugging section, and the sampling bore further comprises a top sampling bore disposed in the top plate.

6. A downhole sampling device according to claim 1, 2 or 3, wherein the lower end of the piston is fixedly mounted inside the sampling barrel, and the upper end of the sampling barrel is provided with an annular stop surface for limiting the downward movement limit of the cylinder liner.

7. A downhole sampling device as claimed in claim 1, 2 or 3, wherein the sampling tube comprises a tube body with openings at two ends, the sealing cover assembly is mounted at one end of the tube body, the pressure release valve is mounted at the other end of the tube body, the pressure release valve comprises a valve body fixedly mounted on the tube body, and a pressure release flow channel and a valve core for controlling the on-off of the pressure release flow channel are arranged in the valve body.

8. The downhole sampling device of claim 7, wherein the pressure relief flow path extends in a vertical direction, the pressure relief flow path comprises a first section connected to the sample storage chamber and a second section connected to an exterior of the downhole sampling device, and the first and second sections are laterally offset.

9. The downhole sampling device of claim 8, wherein the valve body has a valve plug mounting hole for mounting the valve plug therein, the valve plug mounting hole extending transversely through the valve body and communicating with both the first and second sections, the valve plug having an annular relief groove therein for communicating the first and second sections.

10. A downhole sampling device as claimed in claim 1, 2 or 3 wherein the external diameter of the downhole sampling device is adapted to be smaller than the internal diameter of the tubular string and an annular flow passage is formed between the downhole sampling device and the tubular string.