CN203145913U - Completion pipe string for delaying bottom water coning - Google Patents
Completion pipe string for delaying bottom water coning Download PDFInfo
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- CN203145913U CN203145913U CN 201320093728 CN201320093728U CN203145913U CN 203145913 U CN203145913 U CN 203145913U CN 201320093728 CN201320093728 CN 201320093728 CN 201320093728 U CN201320093728 U CN 201320093728U CN 203145913 U CN203145913 U CN 203145913U
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- casing
- sleeve pipe
- reducing sleeve
- annular space
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Abstract
The utility model relates to a completion pipe string for delaying bottom water coning. The completion pipe string is characterized by comprising a down-hole casing, wherein the upper part of the down-hole casing is provided with a production pipe string, and the lower part of the down-hole casing is provided with an L-shaped reducing casing; the top of the vertical section of the reducing casing is fixedly connected in the down-hole casing through a casing hanger; an annular space is reserved between the horizontal section of the reducing casing and the wall of a well; the middle part of the horizontal section of the reducing casing is provided with an expanding section of which the pipe diameter is greater than diameters of the two ends, namely an annular space between the expanding section and the wall of the well is smaller than annular spaces between the horizontal sections at two ends and the wall of the well; and a plurality of through holes are formed in the toe pipe wall between the tail end of the expanding section and the tail end of the horizontal section. The completion pipe string solves the problems to balance bottom hole pressure, delay bottom water coning and prolong the development period of an oil-gas well, achieves unexpected effect and can be widely applied to the exploitation process of various horizontal oil-gas wells.
Description
Technical field
The utility model relates to the down-hole completion tubular column in a kind of completion petroleum production engineering, particularly about a kind of can balance payzone section pressure distribution, delay the completion tubular column of bottom water coning.
Background technology
The oil reservoir bottom surface of bottom water reservoir all contacts with end water, and this is bottom water reservoir is better than other oil reservoir aspect exploitation place, also is simultaneously the where the shoe pinches of bottom water reservoir exploitation.On the one hand, oil reservoir and end water engaging surface are long-pending big, and stratum energy can in time be replenished from end water, oil reservoir energy abundance; But then, in horizontal well production because produce that pressure falls around the pit shaft and oil reservoir in equilibrium relation, make that can occur oil-water interface in the bottom water reservoir deforms and be the phenomenon that ridged rises, be bottom water coning, production brings serious product water problems to oil well.
Under the identical condition of reservoir pressure, because the existence of horizontal segment flow resistance, the flow that the stratum flows into pit shaft reduces from the heel to the toe gradually, the producing pressure differential of horizontal segment heel is relatively large, the flow maximum of unit length horizontal segment, under the big discharge capacity working condition of long horizontal well, cause the horizontal segment heel to shift to an earlier date water breakthrough especially easily or see gas, and stayed a large amount of remaining oils at the toe of oil well simultaneously.Influence oil gas field production in order to control bottom water coning, common mode has horizontal well variable density perforation completion, external packer of pipe+slot pipe or perforated pipe completion, external packer of pipe+sliding sleeve liner-type well completion, segmentation to transfer Flow Control water and central tube technology etc.These completion mode mostly need to cooperate special tool, the operation process complexity, and the field conduct difficulty is big, and finally often is difficult to produce a desired effect.
Summary of the invention
At the problems referred to above, the purpose of this utility model provides and a kind ofly manufactures and designs at bottom water reservoir, can realize the balance bottom pressure, prolongs the completion tubular column that delays bottom water coning in oil gas well development cycle.
For achieving the above object, the utility model is taked following technical scheme: a kind of completion tubular column that delays bottom water coning, it is characterized in that: it comprises a down-hole casing, and the top of described down-hole casing is provided with flow string, and the bottom of described down-hole casing is provided with a L shaped reducing sleeve pipe; The top of described reducing sleeve pipe vertical section is fixedly connected in the down-hole casing by a casing hanger, leave annular space between the horizontal segment of described reducing sleeve pipe and the borehole wall, the middle part of described reducing sleeve pipe horizontal segment is provided with caliber greater than an extension diameter section of its two ends caliber, and namely the annular space between described extension diameter section and the described borehole wall is less than the horizontal segment at two ends and the annular space between the borehole wall; Toe tube wall between the end of described extension diameter section end and described horizontal segment is provided with some through holes.
Described reducing sleeve pipe overcoat is provided with a sand control screen, leaves annular space between described sand control screen and the described reducing sleeve pipe.
The utility model is owing to take above technical scheme, it has the following advantages: 1, the utility model is owing to be provided with a reducing sleeve pipe, be provided with a caliber greater than the extension diameter section of its two ends caliber at the middle part of reducing sleeve pipe horizontal segment, and only the toe tube wall between extension diameter section end and the horizontal segment end is provided with some through holes, make the oil gas of the bigger horizontal payzone section heel of pressure must be through after the annular space throttling narrow and small between extension diameter section and the borehole wall, can enter the reducing sleeve pipe by the through hole of toe, this improvement of the present utility model makes the oil gas back pressure of payzone section heel increase, the flow velocity of oil gas slows down, thereby the awl that has delayed horizontal payzone section heel oil-water interfaces advances, make that water evenly advances at the bottom of the horizontal segment, avoid in early days having reduced the influence to toe and bottom payzone section oil-gas mining at horizontal payzone section heel water breakthrough.2, the utility model can cooperate sand control screen to use, and carries out in the oil gas well of sand control measure sand control screen being set in outside the reducing sleeve pipe at needs, can prevent that the stratum sandstone from entering the reducing cased borehole.3, the utility model is owing to be the improvement that the completion tool in routine carries out, although its improved part is fairly simple, but it is applied in hydromechanical theory in the real work, solved the balance bottom pressure, delay bottom water coning, prolong this difficult problem of oil gas well development cycle, and played beyond thought effect.The utility model construction operation program is simple, but has improved the oil-gas mining rate effectively, and it can be widely used in the recovery process of various horizontal oil gas wells.
Description of drawings
Fig. 1 is structural representation of the present utility model
Fig. 2 is the utility model structural representation that is provided with sand control screen
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.
As shown in Figure 1, the utility model is to delay bottom water coning by reducing the flow velocity that oil gas enters blind pipe, it comprises a down-hole casing 1 that is arranged on oil gas well vertical section, the top of down-hole casing 1 is provided with conventional flow string 2, flow string 2 comprises a tubing hanger 21, tubing hanger 21 lower ends connect a flow string 22, and flow string 22 bottoms are fixedly connected in the down-hole casing 1 by a packer 23; Be arranged at intervals with a safety valve 24 and a circulation sliding sleeve 25 on the flow string 22 between packer 23 and the tubing hanger 21, safety valve 24 is electrically connected the outer control of well system by control line 26; The flow string 22 of packer 23 belows is provided with one and is located joint 27.The lower inner wall of down-hole casing 1 is provided with a casing hanger 3, a fixedly connected reducing sleeve pipe 4 on the casing hanger 3, leave annular space 6 between the horizontal segment of reducing sleeve pipe 4 and the borehole wall 5, the horizontal segment middle part of reducing sleeve pipe 4 is provided with an extension diameter section 7, the caliber of extension diameter section 7 is greater than the caliber at reducing sleeve pipe 4 horizontal segment two ends, and namely the annular space 6 between extension diameter section 7 and the borehole wall 5 is less than the horizontal segment at two ends and the annular space 6 between the borehole wall 5.Toe tube wall between the end of extension diameter section 7 ends and horizontal segment is provided with some through holes 8.
In above-described embodiment, better glued at rock sand, in the simple oil well of layer bit comparison, can directly use completion tubular column of the present utility model to carry out completion practice; In the oil gas well that easily shakes out, stop up reducing sleeve pipe 4 in order to prevent that the horizontal segment borehole wall from shaking out, can be outside reducing sleeve pipe 4 a sheathed sand control screen 9, as shown in Figure 2, the heel upper end of sand control screen 9 is connected in the down-hole casing 1 by a screen pipe hanger 10, also leaves annular space 11 between sand control screen 9 and the reducing sleeve pipe 4.Sand control screen 9 is provided with some through holes, enters annular space 11 between reducing sleeve pipe 4 and the sand control screen 9 for oil gas.
The utility model is when carrying out oil producing operation, the oil gas of horizontal payzone section 12 at first enters reducing sleeve pipe 4 and borehole wall 5(or sand control screen 9) between annular space in, oil gas in the annular space can flow to reducing sleeve pipe 4 toes, and enter in the reducing sleeve pipe 4 by the through hole 8 of reducing sleeve pipe 4 toes, utilize modes such as self-energy, gaslift or electric pump suction that oil gas is risen to flow string 2 places then, to carry out conventional oil producing operation.
The oil gas of horizontal payzone section 12 heels is by extension diameter section 6 and borehole wall 5(or the sand control screen 9 of reducing sleeve pipe 4) between annular space the time area of passage diminish, produce throttle effect, make the oil gas back pressure of horizontal payzone section 12 heels increase, the flow velocity of oil gas slows down, thereby the awl that delays horizontal payzone section 12 heel oil-water interfaces advances, make that water evenly advances at the bottom of each horizontal segment, avoid in early days having reduced the influence to toe and bottom payzone section oil-gas mining at horizontal payzone section 12 heel water breakthroughs.
The various embodiments described above only are used for explanation the utility model; wherein the structure of each parts, connected mode etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solutions of the utility model all should do not got rid of outside protection domain of the present utility model.
Claims (2)
1. completion tubular column that delays bottom water coning, it is characterized in that: it comprises a down-hole casing, and the top of described down-hole casing is provided with flow string, and the bottom of described down-hole casing is provided with a L shaped reducing sleeve pipe; The top of described reducing sleeve pipe vertical section is fixedly connected in the down-hole casing by a casing hanger, leave annular space between the horizontal segment of described reducing sleeve pipe and the borehole wall, the middle part of described reducing sleeve pipe horizontal segment is provided with caliber greater than an extension diameter section of its two ends caliber, and namely the annular space between described extension diameter section and the described borehole wall is less than the horizontal segment at two ends and the annular space between the borehole wall; Toe tube wall between the end of described extension diameter section end and described horizontal segment is provided with some through holes.
2. a kind of completion tubular column that delays bottom water coning as claimed in claim 1, it is characterized in that: described reducing sleeve pipe overcoat is provided with a sand control screen, leaves annular space between described sand control screen and the described reducing sleeve pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320093728 CN203145913U (en) | 2013-03-01 | 2013-03-01 | Completion pipe string for delaying bottom water coning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320093728 CN203145913U (en) | 2013-03-01 | 2013-03-01 | Completion pipe string for delaying bottom water coning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203145913U true CN203145913U (en) | 2013-08-21 |
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ID=48973449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320093728 Expired - Lifetime CN203145913U (en) | 2013-03-01 | 2013-03-01 | Completion pipe string for delaying bottom water coning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203145913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122760A (en) * | 2013-03-01 | 2013-05-29 | 中国海洋石油总公司 | Completion pipe string for suspending bottom water coning |
-
2013
- 2013-03-01 CN CN 201320093728 patent/CN203145913U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122760A (en) * | 2013-03-01 | 2013-05-29 | 中国海洋石油总公司 | Completion pipe string for suspending bottom water coning |
| CN103122760B (en) * | 2013-03-01 | 2015-06-10 | 中国海洋石油总公司 | Completion pipe string for suspending bottom water coning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130821 Effective date of abandoning: 20150610 |
|
| RGAV | Abandon patent right to avoid regrant |