CN210371142U

CN210371142U - Underground screw pump

Info

Publication number: CN210371142U
Application number: CN201921143849.9U
Authority: CN
Inventors: 栗继美; 吴运刚; 黄鹏; 司建斌
Original assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Downhole Operation Co Sinopec of Shengli Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Downhole Operation Co Sinopec of Shengli Petroleum Engineering Corp
Priority date: 2019-07-21
Filing date: 2019-07-21
Publication date: 2020-04-21
Anticipated expiration: 2029-07-21

Abstract

The utility model discloses a screw pump in pit, a screw pump in pit includes the locating pin, and the lower extreme at the stator is connected to the locating pin, is equipped with the centre bore that can let construction instrument or instrument pass through in the locating pin. During construction, the lower end of the stator is connected with the positioning pin, the upper end of the stator is connected with the upper pump pipe column, and the lower end of the positioning pin is connected with the lower pump pipe column and is lowered to a preset depth in the well; connecting a construction instrument or tool to the lower end of a construction cable or rod pipe, and installing a sliding centralizer on the construction cable or rod pipe above the construction instrument or tool; and lowering the construction cable or the rod pipe, enabling a construction instrument or a tool to pass through the stator and the positioning pin, and lowering the construction instrument or the tool to a preset position for construction. The utility model discloses shorten the oil testing greatly and put into production operation cycle, reduced the operating cost by a wide margin, improved the construction operation scope that screw pump and other instrument combinations used, also be favorable to the protection to the reservoir when improving the efficiency of construction.

Description

Underground screw pump

Technical Field

The utility model relates to a petroleum industry ground drive's screw pump in pit, especially a screw pump in pit.

Background

In order to save construction operation cost and shorten construction period in oil and gas exploration and development, a construction operation mode that a perforation and a pump are combined in a tubular column is often adopted, so that the construction operation cost can be greatly reduced, and the operation period is shortened.

For wells with perforated intervals not exceeding 1500m, surface-driven downhole screw pumps are often used as pumping tools. The ground driving underground screw pump is characterized in that a ground driving device transmits a rotating torque to a rotor through a sucker rod string to drive the rotor to rotate so as to realize liquid discharge. Compared with other liquid drainage modes, the liquid drainage device has the advantages of low production cost, convenience in field installation and use, energy conservation, wide application range of crude oil viscosity and the like. However, the internal structures of the positioning pin at the bottom of the existing underground screw pump are all intercepting structures, such as two parallel rods or a round steel plate with a plurality of holes, the structures are not full-diameter structures and only allow fluid to pass through, and a well descending instrument and tools cannot pass through. The internal structure of the locating pin prevents the downhole instrument or tool carried by the construction cable or the rod pipe from passing through the screw pump, and the screw pump does not have the functions of centering and preventing the abrasion of the inner cavity of the stator for the construction cable or the rod pipe passing through the screw pump. Therefore, when the down-hole screw pump liquid drainage and perforation are simultaneously used for one-trip tubular column construction, a down-hole instrument or a tool does not penetrate through the screw pump generally, the down-hole depth of the screw pump is designed to be close to the perforating gun, the distance between a stator of the screw pump and the perforating gun is shortened, the length of the tubular column is checked by the construction instrument carried by the construction cable as much as possible, and the perforating precision of the perforating gun on a target perforating well section is improved.

The lift of a common screw pump is only 1400m, the maximum lowering depth is usually designed to be 1400m, if the position of a reservoir layer extracted by using the screw pump is near 1400m, the perforation error of a perforating gun on the reservoir layer is not large, but if the position of the reservoir layer extracted by using the screw pump is below 1500m, the existing perforation-test-screw pump liquid drainage integrated tubular column process can generate large perforation error. Because a well descending instrument or a tool cannot penetrate through the screw pump to depth the pump descending tubular column, and the perforation can generate large errors when the length of the tubular column which cannot be deeply calibrated is too long, the existing perforation-testing-screw pump liquid drainage integrated tubular column process is usually only used in a well with the depth of a perforation well section not exceeding 1500m, and the deeper perforation well section usually adopts a mode of dividing the perforation and the screw pump descending tubular column into two tubular columns for completion.

The current method is only limited to using a sucker rod to carry a rod type oil pumping device and using reciprocating motion to realize pumping drainage, and the drainage mode needs to install a heavy reciprocating type driving system on the ground, so that the power consumption is high, the transportation, installation and use costs are high, and the safety risk of hoisting is high.

The problems limit the application range of the screw pump liquid discharge and perforating one-time pipe column completion operation technology, cause wells with perforating depth exceeding 1500m, increase the construction operation cost and have longer test oil/production operation period.

Disclosure of Invention

The utility model aims at providing an above-mentioned defect to prior art exists provides a screw pump in pit, solves the screw pump and can not pass construction cable or pole pipe, to the difficult problem of under-pump construction, realizes the range of application of the multi-functional tubular column that can take the screw pump, reduces the operating cost of oil pipe transport perforation and screw pump construction well.

The technical scheme of the utility model is that:

the utility model provides a screw pump in pit includes the locating pin, and the lower extreme at the stator is connected to the locating pin, is equipped with the centre bore that can let construction instrument or instrument pass through in the locating pin.

The inner diameter of the center hole of the positioning pin is larger than the outer diameter of a construction instrument or a tool and smaller than the minimum drift diameter of the screw pump stator.

And chamfers are arranged on the inner walls of the upper end and the lower end of the center hole of the positioning pin.

And the inner surface of the positioning pin is provided with a wear-resistant layer.

The excircle of both ends of locating pin is equipped with the screw thread, is connected with stator and pump lower limb respectively.

The utility model has the advantages that: the utility model discloses improved the structure of the locating pin that the screw pump bottom is connected, improved the locating pin for full latus rectum with it, guaranteed that construction instrument or instrument can from following through. Because the sliding centralizer can be seated on the upper end of the stator to centralize a construction cable or a rod pipe, and the abrasion to the inner cavity of the stator is effectively prevented. The size of the central hole of the positioning pin is larger than a construction instrument or a tool needing to pass through and smaller than the minimum inner drift diameter of the screw pump stator, so that the moving range of a construction cable or a rod pipe in the inner cavity of the screw pump stator is limited from the bottom of the screw pump stator, and the abrasion of the construction cable or the rod pipe to the inner cavity of the screw pump stator is prevented.

The utility model provides a screw pump rotor is after construction instrument or instrument construction completion, go into the screw pump stator again, let construction cable or pole pipe carry construction instrument or instrument go into the tubular column that has the screw pump stator earlier, pass through stator and locating pin and accomplish construction under the pump, when treating the rotary pump, go into the stator again with the screw pump rotor, the difficult problem of construction cable or pole pipe construction under to the pump can not be passed in the screw pump has been solved, realize the range of application of multi-functional one-trip tubular column, reduce the screw pump oil recovery well and pass through oil pipe transport perforation and construction cost. .

The utility model discloses especially, be suitable for and use in the multi-functional one-trip construction operation tubular column of accomplishing perforation and screw pump flowing back or subsidiary test, can make construction cable or pole pipe carry construction instrument or instrument and pass through the screw pump, thereby make the construction tubular column possess the well logging simultaneously except possessing the flowing back function, operation functions such as perforation, the quick pump drainage of changeing after the perforation has been realized, the test oil and the operation cycle of putting into production have been shortened greatly, the operating cost has been reduced by a wide margin, the construction operation scope of screw pump and other instrument combination uses has been improved, also be favorable to the protection to the reservoir stratum when improving the efficiency of construction.

Use the utility model discloses can also bring other additional effects, if reduced the number of times of pulling out of construction tubular column, not only shortened the operation time limit for a project, reduced the operating cost, but also reduced the damage of the oil pipe screw thread of tubular column pulling out of-process, reduced oil pipe's restoration and loss cost.

The utility model provides a screw pump installation convenience simple to use, it is the same with the use and the installation of conventional screw pump in the pit, reduced the administrative cost and the construction degree of difficulty, can also show reduction workman's intensity of labour simultaneously, improve the security of production, have apparent economic benefits and social.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The following detailed description of the present invention with reference to the drawings is not intended to limit the scope of the present invention, and all the modifications of the present invention belong to the protection category.

Referring to fig. 1, a down-hole screw pump includes a locating pin 5, the locating pin 5 is connected to a lower end of a stator 3, and a center hole through which a construction instrument or tool 6 can pass is provided in the locating pin 5. The stator 3 in the screw pump has a single-layer structure and also has a double-layer structure. The construction instrument or tool 6 comprises a gamma instrument, a magnetic locator, a pressure gauge, a weighting rod and a sliding sleeve opening tool, after the construction instrument or tool 6 passes through the screw pump, the depth of the lower pump tubular column can be electrically measured and checked, the depth of the liquid level in the lower pump oil pipe can be measured, the lower pump fluid can be sampled, tools on the lower pump tubular column can be opened and closed by using conveying sliding sleeve opening and closing tools such as a coiled tubing or a cable, a steel wire and the like, and the lower pump oil pipe can be cut, punched and the like by using the conveying construction tools such as the cable or the coiled tubing.

The inner diameter of the center hole of the positioning pin 5 is larger than the outer diameter of a construction instrument or tool 6 and smaller than the minimum drift diameter of the screw pump stator 3.

The inner walls of the upper end and the lower end of the center hole of the positioning pin 5 are provided with chamfers, so that a construction instrument or a tool 6 can be conveniently put in and taken out, the inner cavity surface of the stator 3 can be protected, and the inner cavity surface of the stator 3 can be prevented from being abraded by a construction cable or a rod pipe 6。

The inner surface of the positioning pin 5 is provided with a wear-resistant layer，Such as: chrome plating, nitriding, nickel-phosphorus plating, wear-resistant alloy coating and the like.

The excircle of the two ends of the positioning pin 5 is provided with threads which are respectively connected with the stator 3 and the pump lower tubular column 7.

The lower pump tubular column 7 of the screw pump needs to be matched with tools for preventing the tubular column from rotating, such as a turning plate type tubing anchor, a cam type tubing anchor or a slip packer and the like.

A construction method for passing through a downhole screw pump comprises the following steps:

A. the lower end of the stator 3 is connected with a positioning pin 5, the upper end of the stator is connected with an upper pump pipe column 1, the lower end of the positioning pin 5 is connected with a lower pump pipe column 7, and the stator is lowered to a preset depth in the well;

B. connecting a construction instrument or tool 6 to the lower end of a construction cable or rod pipe 4, and installing a sliding centralizer 2 on the construction cable or rod pipe 4 above the construction instrument or tool 6; the construction cable or rod pipe 4 comprises tools which can put a construction instrument or tool 6 into the well, such as a logging cable, a steel wire rope, a sucker rod, a continuous oil pipe and the like;

C. lowering a construction cable or a rod pipe 4, enabling a construction instrument or a tool 6 to penetrate through the stator 3 and the positioning pin 5, and lowering to a preset position for construction;

D. after construction, the construction instrument or tool 6 is lifted out and the sliding centralizer 2 is brought out to the ground.

The inner diameter of the sliding centralizer 2 is larger than the outer diameter of a construction cable or a rod pipe 4, and the outer diameter of the sliding centralizer is larger than the maximum inner drift diameter of the stator 3 and is smaller than the inner diameter of the pipe column 1 on the pump. When the construction instrument or tool 6 and the sliding centralizer 2 are put down to the upper end of the stator 3, the construction instrument or tool 6 penetrates through the screw pump and the positioning pin 5, the sliding centralizer 2 stays in the upper pump tubular column 1 above the stator 3 due to the fact that the outer diameter of the sliding centralizer 2 is larger than the maximum inner diameter of the stator 3, and the construction cable or the rod pipe 4 is prevented from wearing the inner cavity of the stator 3 while being centered.

When the screw pump oil production well needs to be pumped, a sucker rod string or a torque rod string with a rotor at the bottom is put into the stator 3, and the installation is completed according to the use mode of the screw pump, so that the pumping is realized.

Claims

1. The utility model provides a screw pump in pit, includes locating pin (5), and the lower extreme at stator (3) is connected in locating pin (5), characterized by is equipped with the centre bore that can let construction instrument or instrument (6) pass through in locating pin (5).

2. A downhole screw pump according to claim 1, wherein the inner diameter of the central bore of the locating pin (5) is larger than the outer diameter of the construction instrument or tool (6) and smaller than the smallest diameter of the screw pump stator (3).

3. A downhole screw pump according to claim 1 or 2, wherein the inner walls of the upper and lower ends of the central bore of the locating pin (5) are chamfered.

4. A downhole screw pump according to claim 3, wherein the inner surface of the locating pin (5) is provided with a wear resistant layer.

5. A downhole screw pump according to claim 4, wherein the outer circles of both ends of the locating pin (5) are provided with threads and are respectively connected with the stator (3) and the pump lower pipe column (7).