A full reservoir sampling tester for oil and gas wells

Abstract

The present invention relates to the technical field related to oil and gas well sampling, and discloses an oil and gas well full-reservoir sampling tester, including a sampling tube, the sampling tube is made of elastic material, the sampling tube is provided with a sampling cavity, at least two groups of sampling pistons are slidably provided in the sampling cavity, a lifting line is provided between adjacent sampling pistons, a pointed mounting part is provided at the lower end of the sampling tube, and a pointed part is provided at the lower end of the pointed mounting part. By arranging the pointed part, the sampling tube, the sampling cavity, the sampling piston, the lifting line, the sampling port, etc., the device is placed in the oil well, and the lifting line drives the sampling piston to move upward from top to bottom in sequence. As the depth of the device in the well increases, oil and gas at different depths are supplemented into the gap between adjacent sampling pistons through the sampling port, thereby realizing the function of depth sampling.

Description

Technical Field

[0001] The invention relates to the technical field related to oil and gas well sampling, and in particular to an oil and gas well full reservoir sampling tester. Background Art

[0002] With the continuous deepening of oil development and the increase in water injection workload, the various oil layers produced underground have undergone great changes: formation pressure deficit; formation water content changes; formation productivity changes; the total production and water content of a single well have changed, etc. The cased well formation test sampler is an instrument designed to measure pressure and sample a single layer and grasp the dynamic changes of a single layer in a timely manner. At present, there are two types of formation testing technologies, one is oil rod formation testing and the other is cable formation testing. The construction period of oil rod formation testing is long, the labor intensity is high, the positioning operation is complex, and the safety control is poor. Cable formation testing uses a cable to transport the downhole part of the instrument to the underground, uses a natural gamma instrument to calibrate the depth and position, and then issues a command through the ground control part to enable the downhole instrument (test part and pumping part) to complete the isolation, testing and sampling of the target well section, and use temperature sensors, pressure sensors, and fluid identification sensors to monitor the formation fluid characteristics to complete the dynamic evaluation of the reservoir. However, after an oil well has been used for a period of time, blockages may appear in the oil well, which is often caused by loose rock formations. Existing sampling equipment usually cannot pass through the blocked area well and has poor passability. Therefore, the main problem to be solved by the present invention is to improve the passability of the sampler and provide a method for sampling the entire reservoir at different depths in one operation. Summary of the invention

[0003] The object of the present invention is to provide an oil and gas well full reservoir sampling tester to overcome the above-mentioned defects in the prior art.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides an oil and gas well full-reservoir sampling tester, comprising a sampling tube, the sampling tube is provided with a sampling cavity, at least two groups of sampling pistons are slidably provided in the sampling cavity, a lifting line is provided between adjacent sampling pistons, a pointed mounting portion is provided at the lower end of the sampling tube, a pointed portion is provided at the lower end of the pointed mounting portion, the pointed mounting portion is provided with an impact slide groove, an impact block is slidably provided in the impact slide groove, the sampling cavity is connected to the outside and is provided with a sampling port, a sampling conical plate is provided on the outer side of the sampling tube and located on the upper side of the sampling port opening, a connecting pipe is provided at the upper end of the sampling cavity, the sampling conical plate is rotatably connected to the outer side of the sampling tube, a spiral plate is provided on the inner side of the sampling conical plate, the spiral plates are spirally distributed on the inner surface of the sampling conical plate, a take-up wheel is provided on the upper side wall of the sampling cavity, and the upper end of the lifting line is connected to the take-up wheel.

[0006] According to a further technical solution, a rotating barrel is rotatably provided on the outer side of the sampling tube, a connecting rod is provided on the upper end of the rotating barrel, and the connecting rod is connected to the sampling cone plate.

[0007] A further technical solution is that an extraction power chamber is provided on the upper wall of the sampling chamber, a driving pulley is provided for rotation inside the extraction power chamber, a motor is connected to the shaft of the driving pulley, the driving pulley is connected to the lifting line, the lower side of the extraction power chamber is connected to the sampling chamber, and the lower end of the lifting line extends into the sampling chamber.

[0008] A further technical solution is that a reset chamber is provided on the lower wall of the sampling chamber, the upper side of the reset chamber is connected to the sampling chamber, a motor is provided in the reset chamber, the motor shaft of the reset chamber is provided with a reset pulley, the reset pulley is provided with a reset wire, a through wire groove is provided in the middle of the sampling piston which is connected up and down, the reset wire passes through the through wire groove, a limit block is provided at the upper end of the reset line, and the limit block is stuck on the upper side of the sampling piston on the uppermost side.

[0009] According to a further technical solution, two groups of air vents are connected to the lower cavity of the impact chute, two groups of air pipes are arranged in the connecting pipe, the air inlet pipe and the air outlet pipe of the connecting pipe are respectively connected to the two groups of air vents, and the air outlet pipe of the connecting pipe is provided with a switch.

[0010] A further technical solution is that a rotating ring is rotatably provided between the sampling tube and the pointed mounting portion, teeth are provided on the outer side of the rotating ring, a sliding tooth groove is provided on the inner side of the rotating barrel, sliding teeth are slidably provided in the sliding tooth groove, a spring is provided between the sliding teeth and the wall of the sliding tooth groove, the sliding teeth are meshed with teeth on the outer side of the rotating ring, a threaded hole is provided in the middle of the rotating ring, the threaded hole is provided with threads, a screw is threadedly connected in the threaded hole, an impact pad is provided at the lower end of the screw, an impact groove is provided in the middle of the pointed mounting portion, the impact pad is slidably provided in the impact groove, and a spring is provided between the lower side of the impact pad and the upper end of the impact block.

[0011] According to a further technical solution, the sampling tube is provided with a longitudinal slide groove, the longitudinal slide groove opens downward, a longitudinal slider is provided in the longitudinal slide groove for sliding up and down, a return spring is provided between the longitudinal slider and the upper side wall of the longitudinal slide groove, and the lower end of the longitudinal slider is connected to the screw rod.

[0012] Beneficial effects of the present invention:

[0013] An oil and gas well full-reservoir sampling tester of the present invention is placed in an oil well by arranging a pointed head, a sampling tube, a sampling cavity, a sampling piston, a lifting line, a sampling port, etc. The lifting line drives the sampling piston to move upward from top to bottom in sequence. As the depth of the device in the well increases, oil and gas at different depths are supplemented to the gap between adjacent sampling pistons through the sampling port, thereby realizing the function of depth-divided sampling. Compared with the existing sampler, the sampling cavity of the device is distributed longitudinally, and the volume of the sampling cavity can be greatly increased without increasing the diameter. Liquid, gaseous and solid substances at multiple depths can be extracted at one time, and the adaptability is strong.

[0014] The present invention provides a full-reservoir sampling tester for oil and gas wells by setting a pointed head, an impact chute, an impact block, a sampling cone plate, a spiral plate, etc. The device continues to move downward under the action of gravity until the pointed head touches the bottom, the impact block slides back and forth in the impact chute, the impact block hits the lower side wall of the impact chute at high speed, and the pointed head mounting part drives the pointed head to drill further downward into the oil mud, thereby providing impact force for the device to penetrate obstacles such as oil mud and gravel downward.

[0015] As the impact block repeatedly impacts the bottom of the chute, the rotating barrel drives the sampling cone plate to rotate, and the spirally distributed spiral plate collects the solid matter on the outside into the sampling cavity. The solid matter passes through the gap between the lower side of the sampling cone plate and the sampling tube, and enters the sampling cavity through the sampling port, and is collected by the upper and lower groups of sampling pistons, thereby realizing the full reservoir collection function of solid, liquid and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at the middle BB;

[0021] Figure 4 yes Figure 1 Schematic diagram of the enlarged structure at C in the middle;

[0022] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of D in the figure. DETAILED DESCRIPTION

[0023] Combine the following Figure 1-5 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are the same as Figure 1 The up-down, left-right, front-back directions of the projection relationship itself are consistent.

[0024] Combined with Figure 1-5 The oil and gas well full reservoir sampling tester comprises a sampling tube 10, wherein the sampling tube 10 is provided with a sampling cavity 11, wherein at least two groups of sampling pistons 12 are slidably provided in the sampling cavity 11, and a lifting line 36 is provided between adjacent sampling pistons 12, and a pointed head mounting part 26 is provided at the lower end of the sampling tube 10, and a pointed head 22 is provided at the lower end of the pointed head mounting part 26, and an impact chute 19 is provided at the pointed head mounting part 26, and an impact block 20 is slidably provided in the impact chute 19, The sampling cavity 11 is connected to the outside and is provided with a sampling port 16. A sampling cone plate 13 is provided on the upper side of the sampling port 16 on the outside of the sampling tube 10. A connecting tube 40 is provided on the upper end of the sampling cavity 11. The sampling cone plate 13 is rotatably connected to the outside of the sampling tube 10. A spiral plate 15 is provided on the inner side of the sampling cone plate 13. The spiral plate 15 is spirally distributed on the inner surface of the sampling cone plate 13. A take-up wheel is provided on the upper side wall of the sampling cavity 11, and the upper end of the lifting line 36 is connected to the take-up wheel.

[0025] The device is placed in an oil well, and the connecting pipe 40 serves to connect the device. The length of the connecting pipe 40 is extended, and the device is extended downward along the oil well. After reaching the specified depth, the take-up wheel rotates to drive the lifting line 36 and the uppermost sampling piston 12 to move upward for a distance. The uppermost sampling piston 12 exceeds the height of the sampling port 16 and continues to move upward until the second-layer sampling piston 12 blocks the opening of the sampling port 16. During this process, the outer oil and gas are supplemented into the gap between the first-layer sampling piston 12 and the second-layer sampling piston 12 through the sampling port 16, completing one sampling. The connecting pipe 40 is continued to be extended, and the take-up wheel is continued to be rotated, so that the oil and gas are absorbed in the gap between the second-layer sampling piston 12 and the third-layer sampling piston 12, thereby realizing the function of depth sampling. The device is under the action of gravity. The impact block 20 is pushed upward by the gas, and the air vent is opened on the lower side of the impact chute 19. Driven by the spring, the impact block 20 hits the lower wall of the impact chute 19 at high speed, and the pointed mounting portion 26 drives the pointed head 22 to drill further downward into the oil sludge, thereby driving the device to move downward. During this process, the sampling cone plate 13 rotates, and the sampling cone plate 13 drives the spiral plate 15 to rotate. The spirally distributed spiral plate 15 collects the solid matter on the outside into the sampling chamber 11. The solid matter passes through the gap between the lower side of the sampling cone plate 13 and the sampling tube 10, and enters the sampling chamber 11 through the sampling port 16, and is collected by the upper and lower groups of sampling pistons 12, thereby realizing the full reservoir collection function of solid, liquid and gas.

[0026] Preferably, a rotating barrel 14 is rotatably provided on the outer side of the sampling tube 10 , a connecting rod 35 is provided on the upper end of the rotating barrel 14 , and the connecting rod 35 is connected to the sampling cone plate 13 .

[0027] The rotating barrel 14 rotates, and the rotating barrel 14 drives the sampling cone plate 13 to rotate through the connecting rod 35. The rotation of the sampling cone plate 13 drives the spiral plate 15 inside the sampling cone plate 13 to rotate, so that the oil sludge and other substances are collected into the sampling cavity 11.

[0028] Preferably, an extraction power chamber 17 is provided on the upper wall of the sampling chamber 11, and a driving pulley 34 is rotatably provided inside the extraction power chamber 17. A motor is connected to the shaft of the driving pulley 34, and a lifting line 36 is connected to the driving pulley 34. The lower side of the extraction power chamber 17 is connected to the sampling chamber 11, and the lower end of the lifting line 36 extends into the sampling chamber 11.

[0029] The motor drives the driving wire wheel 34 in the extraction power chamber 17 to rotate, and the driving wire wheel 34 drives the lifting wire 36 to curl, thereby driving a series of sampling pistons 12 to move upward.

[0030] Preferably, a reset chamber 18 is provided on the lower wall of the sampling chamber 11, and the upper side of the reset chamber 18 is connected to the sampling chamber 11. A motor is provided in the reset chamber 18, and the motor shaft of the reset chamber 18 is provided with a reset pulley 41. The reset pulley 41 is provided with a reset line 37. A through-wire groove 38 is provided in the middle of the sampling piston 12, and the reset line 37 passes through the through-wire groove 38. A limit block 39 is provided at the upper end of the reset line 37, and the limit block 39 is stuck on the upper side of the uppermost sampling piston 12.

[0031] The motor in the reset chamber 18 drives the reset wheel 41 to rotate, and the reset wheel 41 drives the reset line 37 to stretch downward. The reset line 37 pulls the upper sampling piston 12 through the limit block 39, thereby moving the sampling piston 12 downward from top to bottom until all the sampling pistons 12 are reset to the lower cavity of the sampling chamber 11.

[0032] Preferably, two groups of vents 21 are connected to the lower cavity of the impact chute 19, two groups of air pipes are provided in the connecting pipe 40, the air inlet pipe and the air outlet pipe of the connecting pipe 40 are respectively connected to the two groups of vents 21, and the air outlet pipe of the connecting pipe 40 is provided with a switch.

[0033] The air inlet pipe of the connecting pipe 40 is supplemented to the lower side of the impact groove 19 through the air vent 21, thereby squeezing the impact block 20 upward. The air outlet pipe of the connecting pipe 40 is provided with a switch to be turned on, and the spring pushes the impact block 20 to move downward in the impact groove 19, thereby discharging the gas in the impact groove 19 through the air outlet pipe of the connecting pipe 40.

[0034] Preferably, a rotating ring 27 is rotatably provided between the sampling tube 10 and the pointed mounting portion 26, teeth are provided on the outer side of the rotating ring 27, a sliding tooth groove 33 is provided on the inner side of the rotating barrel 14, a sliding tooth 28 is slidably provided in the sliding tooth groove 33, a spring is provided between the sliding tooth 28 and the wall of the sliding tooth groove 33, the sliding tooth 28 is meshed with the teeth on the outer side of the rotating ring 27, a threaded hole 32 is provided in the middle of the rotating ring 27, the threaded hole 32 is provided with threads, a screw 29 is threadedly connected to the threaded hole 32, an impact pad 30 is provided at the lower end of the screw 29, an impact groove 19 is provided in the middle of the pointed mounting portion 26, an impact pad 30 is slidably provided in the impact groove 19, and a spring is provided between the lower side of the impact pad 30 and the upper end of the impact block 20.

[0035] When the impact block 20 moves upward, the impact pad 30 is pressed upward by the spring, and the impact pad 30 drives the screw 29 to move upward in the threaded hole 32. Under the influence of the thread, the rotating ring 27 rotates, and the rotating ring 27 drives the rotating barrel 14 to rotate unidirectionally through the outer toothed belt and sliding teeth 28, thereby providing power for the rotation of the rotating barrel 14.

[0036] Preferably, the sampling tube 10 is provided with a longitudinal slide groove 23, which opens downward. A longitudinal slider 25 is provided in the longitudinal slide groove 23 for sliding up and down. A return spring 24 is provided between the longitudinal slider 25 and the upper side wall of the longitudinal slide groove 23, and the lower end of the longitudinal slider 25 is connected to the screw 29.

[0037] The longitudinal slide groove 23 cooperates with the longitudinal slider 25 to limit the rotation of the longitudinal slider 25. The longitudinal slider 25 can only slide up and down in the longitudinal slide groove 23, thereby converting the up and down movement of the screw rod 29 into the rotation of the rotating ring 27. The function of the reset spring 24 is to push the longitudinal slider 25 to reset downward.

[0038] It should be noted that, although the present specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above-mentioned embodiments only express the preferred implementation modes of the present technical solution. The description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present technical solution. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations, improvements and substitutions can be made, which all belong to the protection scope of the present technical solution.

Claims

1. A full reservoir sampling tester for oil and gas wells, comprising a sampling tube, characterized in that: The sampling tube is made of elastic material, a sampling cavity is provided in the sampling tube, at least two groups of sampling pistons are slidably provided in the sampling cavity, a lifting line is provided between adjacent sampling pistons, a pointed mounting portion is provided at the lower end of the sampling tube, a pointed portion is provided at the lower end of the pointed mounting portion, an impact slide groove is provided on the pointed mounting portion, an impact block is slidably provided in the impact slide groove, the sampling cavity is connected to the outside and is provided with a sampling port, a sampling cone plate is provided on the outer side of the sampling tube and located on the upper side of the sampling port opening, a connecting pipe is provided at the upper end of the sampling cavity, the sampling cone plate is rotatably connected to the outer side of the sampling tube, a spiral plate is provided on the inner side of the sampling cone plate, and the spiral plates are spirally distributed on the inner surface of the sampling cone plate, a take-up wheel is provided on the upper side wall of the sampling cavity, and the upper end of the lifting line is connected to the take-up wheel; The cavity at the lower side of the impact chute is connected to two groups of vents, and two groups of air pipes are arranged in the connecting pipe. The air inlet pipe and the air outlet pipe of the connecting pipe are respectively connected to the two groups of vents, and the air outlet pipe of the connecting pipe is provided with a switch; A rotating ring is rotatably provided between the sampling tube and the pointed mounting portion, a tooth is provided on the outer side of the rotating ring, a sliding tooth slot is provided on the inner side of the rotating barrel, a sliding tooth is slidably provided in the sliding tooth slot, a spring is provided between the sliding tooth and the wall of the sliding tooth slot, the sliding tooth meshes with the tooth on the outer side of the rotating ring, a threaded hole is provided in the middle of the rotating ring, the threaded hole is provided with a thread, and a screw is provided in the threaded connection in the threaded hole; An impact pad is provided at the lower end of the screw rod, an impact slot is provided in the middle of the pointed mounting portion, the impact pad is slidably arranged in the impact slot, and a spring is provided between the lower side of the impact pad and the upper end of the impact block.

2. The oil and gas well full reservoir sampling tester according to claim 1, characterized in that: A rotating barrel is rotatably arranged on the outer side of the sampling tube, a connecting rod is arranged on the upper end of the rotating barrel, and the connecting rod is connected to the sampling cone plate.

3. The oil and gas well full reservoir sampling tester according to claim 1, characterized in that: An extraction power chamber is provided on the upper wall of the sampling chamber, a driving pulley is provided for rotation in the extraction power chamber, a motor is connected to the shaft of the driving pulley, the lifting line is connected to the driving pulley, the lower side of the extraction power chamber is connected to the sampling chamber, and the lower end of the lifting line extends into the sampling chamber.

4. The oil and gas well full reservoir sampling tester according to claim 1, characterized in that: A reset chamber is provided on the lower wall of the sampling chamber, the upper side of the reset chamber is connected with the sampling chamber, a motor is provided in the reset chamber, a reset pulley is provided on the motor shaft of the reset chamber, a reset wire wheel is provided, a through wire groove is provided in the middle of the sampling piston, the reset wire passes through the through wire groove, a limit block is provided at the upper end of the reset wire, and the limit block is stuck on the upper side of the sampling piston at the uppermost side.

5. The oil and gas well full reservoir sampling tester according to claim 1, characterized in that: The sampling tube is provided with a longitudinal slide groove, the longitudinal slide groove opens downward, a longitudinal slider is provided in the longitudinal slide groove for sliding up and down, a return spring is provided between the longitudinal slider and the upper side wall of the longitudinal slide groove, and the lower end of the longitudinal slider is connected to the screw rod.

Images