CN202000912U - Oil-well drainage and liquid level-reducing tubing string - Google Patents
Oil-well drainage and liquid level-reducing tubing string Download PDFInfo
- Publication number
- CN202000912U CN202000912U CN2011200695568U CN201120069556U CN202000912U CN 202000912 U CN202000912 U CN 202000912U CN 2011200695568 U CN2011200695568 U CN 2011200695568U CN 201120069556 U CN201120069556 U CN 201120069556U CN 202000912 U CN202000912 U CN 202000912U
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- liquid level
- oil pipe
- tubing string
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Abstract
An oil-well drainage and liquid level-reducing tubing string is applied to reduce the depth of liquid level of a well shaft during the negative pressure perforation in petroleum industry. The tubing string mainly comprises an oil tubing, a ball seat, a cut-off circulating valve and a bottom plug, wherein the cut-off circulating valve is in threaded connection with the upper part of the bottom plug, the V-shaped ball seat is in threaded connection with the upper part of the cut-off circulating valve, the oil tubing is in threaded connection with the upper part of the ball seat, and the oil tubing directly extends to a well head. The utility model has the benefits as follows: the liquid level of the oil well is reduced by the drainage through the tubing string, so as to achieve the purpose of negative pressure perforation; the problems of complex and difficult construction, high safety risk, long cycle and expensive cost in the liquid level reduction method using liquid nitrogen injection in the prior art are solved; the drainage construction is simple and has less difficulty and low safety risks; and the construction cycle is short and the construction cost is reduced.
Description
Technical field
The utility model relates to the oil technical field of construction in the oil exploration, particularly is to fall the liquid level tubing string for what realize that underbalance perforating reduces the pit shaft level, is that a kind of oil well row drags for and falls the liquid level tubing string.
Background technology
At present, at sea in the exploration well oil test, before the blank tubing underbalance perforating, need to get rid of pit shaft water and fall liquid level, reduce formation contaminant, the maximum production capacity in performance stratum.
Before the present technique utility model, the method that liquid level falls in draining is to inject liquid nitrogen in well.Work progress is as follows: 1, before the construction, the weather conditions that choosing is suitable are near the arrangement towboat is transported to the test offshore wells platform to equipment such as liquid nitrogen pump sledge, liquid nitrogen, liquid nitrogen containers from harbour; 2, utilize the crane on the formation testing platform from towboat, equipment to be hung in place and installation on the platform; 3, cleaning outlet flow container connects discharge opeing and imports and exports flow process, and pressure testing is qualified; 4, the high-pressure pump on the primer pump sledge injects liquid nitrogen (being called anti-act) from the oil jacket annular space, oil pipe outlet draining, and the metering of water feed liquor jar, the accumulative total displacement is used for converting pit shaft and falls level; 5, go out nitrogen in the annular space with needle valve control open flow, so far finished the draining of fluid injection nitrogen and fallen the liquid level construction, total 48 hours times spent, about 560,000 yuan of total operating expenses.Falling the liquid level whole construction course from the draining of fluid injection nitrogen can draw: the method construction is complicated, difficulty is big, exist bigger security risk, and long expense height of cycle.
Summary of the invention
The purpose of this utility model is: provide a kind of oil well row to drag for and fall the liquid level tubing string, utilize oil pipe tubing string row to drag for the reduction oil well liquid level, realize underbalance perforating.Overcome that the draining of former post liquid nitrogen falls that the liquid level method exists that construction is complicated, difficulty and security risk is big and the high problem of long expense of cycle.
The technical solution adopted in the utility model is: oil well row drags for and falls the liquid level tubing string, mainly by oil pipe, ball seat, disconnected pin formula circulating valve and stifled composition of the end; It is characterized in that: the stifled top disconnected pin formula circulating valve that the is threaded end of at, the top of the disconnected pin formula circulating valve V-arrangement ball seat that is threaded, the oil pipe that is threaded on ball seat top, oil pipe is connected to well head always.
It is the oil pipe of 89mm that oil pipe adopts external diameter 73mm or external diameter.
For realizing that dragging for water must get through oil pipe and seal oil pipe again, use be that ball valve and disconnected pin formula circulating valve are existing products.The function of disconnected pin formula circulating valve is: pound the pin that cut-offs in the pin formula circulating valve by the well head caber, ditch oil pipe and annulus access enter in the oil pipe water.Dragging for water when construction, in oil pipe, drop into steel ball, the diameter of steel ball is greater than the centre bore of ball seat, on the V-arrangement face of the ball seat of steel ball seat envelope, on when carrying oil pipe the water in the oil pipe can not flow out, realize that oil pipe drags for water.The end stifled energy shutoff oil pipe lowest part forms the sealing oil pipe when making down oil pipe.The external diameter of oil well casing is 139.7mm or 177.8mm.
The beneficial effects of the utility model: the utility model oil well row drags for and falls the liquid level tubing string, can utilize oil pipe tubing string row to drag for the reduction oil well liquid level, realizes underbalance perforating.Overcome that the draining of former post liquid nitrogen falls that the liquid level method exists that construction is complicated, difficulty and security risk is big and the high problem of long expense of cycle.Drag for that water construction is simple, difficulty is little, security risk is little, and the short construction period expense is few.
Description of drawings
Fig. 1 is that the utility model oil well row drags for the tubular column structure schematic diagram that falls the employing of liquid level tubing string.
Among the figure, 1-sleeve pipe, 2-oil pipe, 3-ball seat, the 4-pin formula circulating valve that breaks, stifled at the bottom of the 5-, the 6-artificial bottom of a well.
The specific embodiment
Embodiment 1: drag for oil well row that to fall the liquid level tubing string be example, the utility model is described in further detail.
Consult Fig. 1.Artificial bottom of a well 6 is arranged at sleeve pipe 1 bottom at oil well.Being lowered to oil well row in sleeve pipe 1 drags for and falls the liquid level tubing string.Oil well row drags for and falls the liquid level tubing string and be made up of oil pipe 2, ball seat 3, disconnected pin formula circulating valve 4 and the end stifled 5.Oil pipe 2 adopts the oil pipe of external diameter 73mm.
Stifled 5 the top disconnected pin formula circulating valve 4 that the is threaded end of at.The top of the disconnected pin formula circulating valve 4 V-arrangement ball seat 3 that is threaded.The oil pipe 2 that is threaded on ball seat 3 tops, oil pipe 2 is connected to well head always, and the length of oil pipe 1 is 3000m.
Oil pipe row drags for and falls the liquid level method and comprise row and two processes of dragging for: the row of being mainly reflected in and dragging for, and by row with drag for the purpose that liquid level falls in realization.
A, row's process: be full of clear water in the sleeve pipe 1, be lowered in sleeve pipe 1 and fall the liquid level tubing string, fall fashionable sealing the under the liquid level tubing string, the water volume of eliminating should be the oil pipe cumulative volume.Fall the liquid level tubing string such as being lowered in sleeve pipe, the length of oil pipe 2 is that 3000m, external diameter are that 73mm, internal diameter are 62mm, total displacement of volume V1: tubing length 3000m * oil pipe external diameter volume 4.18L/m=12.5m
3
B, the process of dragging for: fall the postpone that puts in place under the liquid level tubing string, drop into iron staff from well head, pound the pin that cut-offs pin formula circulating valve 4, make in the oil pipe 2 to be communicated with the oil jacket annular space, annular space water flows in the oil pipe 2, the level balance of the interior and oil jacket annular space of oil pipe 2.Drop into steel ball from well head again, fall on the ball seat 3, at this moment oil pipe 2 becomes sealing.Play oil pipe 2 row then and drag for tubing string and take water in the oil pipe out of, be equivalent to oil pipe and drag for water.Such as following 3000m external diameter 73mm internal diameter 62mm oil pipe in the external diameter 139.7mm wall thickness 9.17mm sleeve pipe, always drag for water volume V2: balance backsight level: tubing length 3000m * oil pipe inner volume 3.02L/m ÷ oil pipe inner volume and annular volume 10.4L/m=871m; V2=(tubing length 3000m-871m) * oil pipe inner volume 3.02L/m=6.4m
3
So, total displacement of volume V=V1+V2=12.5m
3+ 6.4m
3=18.9m
3, conversion level H=18.9m
3÷ oil pipe inner volume and annular volume 10.4L/m+ oil subsidy are apart from 4.0m=1821m.Basic hole volume 2/3rds volumes of discharging meet the requirement that liquid level falls in underbalance perforating.
Since this method utility model is used, six wells on probation at the scene altogether, because of not employing extra equipment and material, just simple lift pipe string down once, be the prevailing operation of formation testing team, success rate reaches 100%, does not have once safety and engineering accident and takes place, reduce labour intensity, be subjected to a line worker welcome.In addition, produced considerable economic, every well partial node is economized 360,000 yuan of engineering costs.Every well shortens construction period 24 hours.
Claims (2)
1. an oil well row drags for and falls the liquid level tubing string, mainly blocks up (5) by oil pipe (2), ball seat (3), disconnected pin formula circulating valve (4) and the end and forms; It is characterized in that: the top of stifled (5) the disconnected pin formula circulating valve (4) that the is threaded end of at, the top of disconnected pin formula circulating valve (4) the V-arrangement ball seat (3) that is threaded, the oil pipe (2) that is threaded on ball seat (3) top, oil pipe (2) is connected to well head always.
2. oil well row according to claim 1 drags for and falls the liquid level tubing string, and it is characterized in that: it is the oil pipe of 89mm that oil pipe (2) adopts external diameter 73mm or external diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200695568U CN202000912U (en) | 2011-03-16 | 2011-03-16 | Oil-well drainage and liquid level-reducing tubing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200695568U CN202000912U (en) | 2011-03-16 | 2011-03-16 | Oil-well drainage and liquid level-reducing tubing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202000912U true CN202000912U (en) | 2011-10-05 |
Family
ID=44703657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200695568U Expired - Lifetime CN202000912U (en) | 2011-03-16 | 2011-03-16 | Oil-well drainage and liquid level-reducing tubing string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202000912U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790916A (en) * | 2015-04-24 | 2015-07-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for removing gas well accumulated liquid by means of oil jacket pressure balancing method |
-
2011
- 2011-03-16 CN CN2011200695568U patent/CN202000912U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790916A (en) * | 2015-04-24 | 2015-07-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for removing gas well accumulated liquid by means of oil jacket pressure balancing method |
| CN104790916B (en) * | 2015-04-24 | 2017-04-19 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for removing gas well accumulated liquid by means of oil jacket pressure balancing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111005 |
|
| CX01 | Expiry of patent term |