CN202611654U - Insertion sealing structure for water injection sand prevention well - Google Patents
Insertion sealing structure for water injection sand prevention well Download PDFInfo
- Publication number
- CN202611654U CN202611654U CN 201220230167 CN201220230167U CN202611654U CN 202611654 U CN202611654 U CN 202611654U CN 201220230167 CN201220230167 CN 201220230167 CN 201220230167 U CN201220230167 U CN 201220230167U CN 202611654 U CN202611654 U CN 202611654U
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- water inlet
- annular space
- inlet cover
- central tube
- tube
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Abstract
The utility model discloses an insertion sealing structure for a water injection sand prevention well. The insertion sealing structure comprises an upper sealing cylinder, and a water inlet sleeve which is arranged in the upper sealing cylinder and fixedly connected with a central tube, wherein a step surface is arranged in the water inlet sleeve; a first annular space is formed between the thin-wall section of the water inlet sleeve under the step surface and the central tube; a water inlet which is communicated with the first annular space is formed on the top; a second annular space is formed between the water inlet sleeve and the cylinder wall of the upper sealing cylinder; a piston is arranged in the second annular space; a spring is clamped between the piston and the cylinder bottom of the upper sealing cylinder; the lower end of the upper sealing cylinder is connected with a lower sealing cylinder; a third annular space which is communicated with the first annular space is formed between the cylinder wall of the lower sealing cylinder and the central tube; a water outlet which is communicated with the third annular space is formed at the lower end; and a sealing module is fixed on an external circle of the lower sealing cylinder. By adoption of the structure, the central tube is not required to be lifted in the flushing process of a water injection well, and a well back-flushing process can be realized. The insertion sealing structure for the water injection sand prevention well is simple in construction process, high in efficiency, short in construction time and low in cost.
Description
Technical field
The utility model relates to a kind of insertion hermetically-sealed construction, particularly relates to a kind of insertion hermetically-sealed construction that is used for the water filling sand proof well.
Background technology
At present, each oil field in multilayered reservoir waterflooding extraction process, is generally used separate injection tubing string for improving the oil field development benefit, and each interlayer generally adopts the insertion sealing to insert layer separating packer and realizes seperated layer water injection.Normal water filling is injected water and is got into the stratum from oil pipe through inserting sealing and injection well downhole flow regulator.But when the needs well-flushing, owing to insert seat envelope between sealing and the packer, can't set up the flow channel of flushing fluid, the therefore employing mentioned water injection string and realized anti-flushing well technology more, and construction technology is complicated, efficient is low, the engineering time is long, cost is high.
The utility model content
The utility model provides a kind of insertion hermetically-sealed construction of water filling sand proof well for solving the technical problem that exists in the known technology; Adopt this structure; In the water injection well washing well process, need not mention tubing string, just can realize anti-flushing well technology, construction technology is simple, efficient is high, the engineering time is short, cost is low.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: a kind of insertion hermetically-sealed construction that is used for the water filling sand proof well; Comprise the inversion upper seal bore that is packed on the central tube cylindrical; Be arranged on the water inlet cover in the said upper seal bore; On the inwall of said water inlet cover, be provided with the step surface that is positioned at said water inlet cover middle part; Be formed with first annular space between water inlet cover thin segment under the step surface and the central tube, the top of said water inlet cover thin segment is provided with the water inlet that is communicated with said first annular space, and stretch out outside said upper seal bore the bottom of said water inlet cover thin segment; Water inlet cover heavy wall section suit on the step surface is fixed on the central tube; Between the barrel of said water inlet cover and said upper seal bore, be formed with second annular space; In said second annular space, piston is installed, said piston shutoff is clamped with spring between an end of said piston and said upper seal bore on said water inlet; The lower end of said upper seal bore is connected with the upper end of lower seal tube; Be formed with the 3rd annular space that is communicated with said first annular space between the barrel of said lower seal tube and the central tube, the barrel bottom of said lower seal tube is provided with the delivery port that is communicated with said the 3rd annular space; Be fixed with seal modules on the barrel cylindrical of said lower seal tube.
Said seal modules has three groups, and three groups of said seal modules are evenly arranged on the said lower seal tube.
Advantage and the good effect that the utlity model has are: be employed in to insert in the sealing and set up the backwash passage; And be provided with by the water inlet that casing pressure is opened, spring is closed, make to insert to seal to have the ball-and-seat function, when the water injection well water filling; Prevent channelling; When well-flushing, need not mention central tube, just can realize anti-flushing well technology, construction technology is simple, efficient is high, the engineering time is short, cost is low.And the anti-flushing well passage that inserts sealing is big, is difficult for being stopped up by granule foreign; Simple in structure, few easy workout part, period of validity are long, can reuse, and can be widely used in the oil field sand prevention water injection well.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure: 1, central tube, 2, upper seal bore, 3, spring, 4, the water inlet cover, 5, piston, 6, the lower seal tube, 7, seal modules, the 8, the 3rd annular space, 9, first annular space, 10, second annular space, 4-1, step surface, 4-2, water inlet, 6-1, delivery port.
The specific embodiment
For further understanding summary of the invention, characteristics and the effect of the utility model, the following examples of giving an example now, and conjunction with figs. specifies as follows:
See also Fig. 1; A kind of insertion hermetically-sealed construction that is used for the water filling sand proof well; Comprise the inversion upper seal bore 2 that is packed on central tube 1 cylindrical; Be arranged on the water inlets cover 4 in the upper seal bore 2, the inwall of water inlet cover 4 is provided with and is positioned at the step surface 4-1 that water into overlaps 4 middle parts, and the water inlet step surface 4-1 is under overlapped between thin segment and the central tube 1 and is formed with first annular space 9; The top of water inlet cover thin segment is provided with the water inlet 4-2 that is communicated with first annular space 9, and stretch out outside upper seal bore 2 bottom of water inlet cover thin segment; Water inlet cover heavy wall section suit on the step surface 4-1 is fixed on the central tube 1; Between the barrel of water inlet cover 4 and upper seal bore 2, be formed with second annular space 10; In second annular space 10, piston 5 is installed, piston 5 shutoff are clamped with spring 3 between an end of piston 5 and upper seal bore 2 on water inlet 4-2; The lower end of upper seal bore 2 is connected with the upper end of lower seal tube 6, is formed with the 3rd annular space 8 that is communicated with first annular space 9 between the barrel of lower seal tube 6 and the central tube, and the barrel bottom of lower seal tube 6 is provided with the delivery port 6-1 that is communicated with the 3rd annular space 8; Be fixed with seal modules 7 on the barrel cylindrical of lower seal tube 6, seal modules 7 has three groups, and three groups of seal modules 7 are evenly arranged on the lower seal tube 6.
The operating principle of the utility model:
Above-mentioned insertion sealing is required with oil pipe down to target depth according to pipe arrangement, and seal modules cooperates with layer separating packer, realizes sealing, and reaches the layering purpose of different injection interlayer.During normal water filling, water filling is flow through in central tube, and oil pressure is greater than casing pressure, and spring is in elongation state, the piston shutoff water inlet that puts of water inlet, the backwash passage water inlet that is formed by first annular space and the 3rd annular space is in closed condition.Inject water and get into each water filling layer through corresponding injection well downhole flow regulator.Piston and the supporting structure of intaking and overlapping have been realized the ball-and-seat function, prevent crossflow.When pit shaft needed anti-flushing well, casing pressure was greater than oil pressure, and anti-flushing well liquid gets into second annular space between piston and the water inlet cover; Promote piston stroking upward compression spring; Open the water inlet that water inlet puts, anti-flushing well liquid gets into the backwash passage, and flows to the lower port of central tube through the delivery port on the lower seal tube; Last anti-flushing well liquid backflows to ground through the central tube inner chamber, accomplishes the anti-flushing well flow process.
Although combine accompanying drawing that the preferred embodiment of the utility model is described above; But the utility model is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under the enlightenment of the utility model; Not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection domain of the utility model.
Claims (2)
1. insertion hermetically-sealed construction that is used for the water filling sand proof well; It is characterized in that; Comprise the inversion upper seal bore that is packed on the central tube cylindrical; Be arranged on the water inlet cover in the said upper seal bore, on the inwall of said water inlet cover, be provided with the step surface that is positioned at said water inlet cover middle part, be formed with first annular space between water inlet cover thin segment under the step surface and the central tube; The top of said water inlet cover thin segment is provided with the water inlet that is communicated with said first annular space, and stretch out outside said upper seal bore the bottom of said water inlet cover thin segment; Water inlet cover heavy wall section suit on the step surface is fixed on the central tube; Between the barrel of said water inlet cover and said upper seal bore, be formed with second annular space; In said second annular space, piston is installed, said piston shutoff is clamped with spring between an end of said piston and said upper seal bore on said water inlet; The lower end of said upper seal bore is connected with the upper end of lower seal tube; Be formed with the 3rd annular space that is communicated with said first annular space between the barrel of said lower seal tube and the central tube, the barrel bottom of said lower seal tube is provided with the delivery port that is communicated with said the 3rd annular space; Be fixed with seal modules on the barrel cylindrical of said lower seal tube.
2. the insertion hermetically-sealed construction that is used for the water filling sand proof well according to claim 1 is characterized in that said seal modules has three groups, and three groups of said seal modules are evenly arranged on the said lower seal tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220230167 CN202611654U (en) | 2012-05-21 | 2012-05-21 | Insertion sealing structure for water injection sand prevention well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220230167 CN202611654U (en) | 2012-05-21 | 2012-05-21 | Insertion sealing structure for water injection sand prevention well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202611654U true CN202611654U (en) | 2012-12-19 |
Family
ID=47345363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220230167 Expired - Fee Related CN202611654U (en) | 2012-05-21 | 2012-05-21 | Insertion sealing structure for water injection sand prevention well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202611654U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452524A (en) * | 2013-08-27 | 2013-12-18 | 中国海洋石油总公司 | Electrically-flushable packer and electrically-flushable insert seal for flooding well |
-
2012
- 2012-05-21 CN CN 201220230167 patent/CN202611654U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452524A (en) * | 2013-08-27 | 2013-12-18 | 中国海洋石油总公司 | Electrically-flushable packer and electrically-flushable insert seal for flooding well |
| CN103452524B (en) * | 2013-08-27 | 2016-02-10 | 中国海洋石油总公司 | Water injection well with can electric well flushing packer and can electric well flushing insert sealing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: Tianjin Branch of China Sea Prtroleum (China) Co., Ltd. Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: Tianjin Branch of China Sea Prtroleum (China) Co., Ltd. Patentee before: China National Offshore Oil Corporation |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20190521 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |