CN107762443B - Well workover device and well workover method - Google Patents
Well workover device and well workover method Download PDFInfo
- Publication number
- CN107762443B CN107762443B CN201610685655.6A CN201610685655A CN107762443B CN 107762443 B CN107762443 B CN 107762443B CN 201610685655 A CN201610685655 A CN 201610685655A CN 107762443 B CN107762443 B CN 107762443B
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- Prior art keywords
- well
- hole
- cylindrical body
- casing
- injection pipe
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 68
- 239000007924 injection Substances 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 10
- 230000008439 repair process Effects 0.000 abstract description 10
- 230000005465 channeling Effects 0.000 abstract description 5
- 239000003129 oil well Substances 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a well workover device and a well workover method. The well repairing device comprises a through cylindrical body, at least two packers are axially arranged on the outer part of the cylindrical body, a space is arranged between the adjacent packers, an inner injection pipe is slidably arranged in the cylindrical body, the upper end of the inner injection pipe is open, the lower end of the inner injection pipe in the cylindrical body is closed, an outlet hole is formed in the side wall of the inner injection pipe, and an injection hole capable of being communicated with the outlet hole is arranged in the space of the cylindrical body. The well repairing device can repair the problem of external pipe channeling of an oil well and a gas well, and does not need drilling operation after well repairing is finished.
Description
Technical Field
The invention relates to the field of petroleum exploration and development, in particular to a well repairing device. The invention also relates to a method for repairing a well using the well repairing device of the invention.
Background
After the casing is well-cemented and produced in the well of an oil well or a gas well, due to the cementing quality, the complex condition of the stratum and other reasons, the cementing cement sheath between the casing and the well wall is easily damaged, so that the problems of water and gas channeling outside the casing and the like are caused, the production life of the oil and gas well is greatly shortened, and potential safety production hazards and operation risks are caused.
Currently, the most common well intervention methods for this out-of-pipe cross-flow problem are: a bottom packer is lowered into the casing to a position below the problematic zone of the casing. Then, a workover device (such as a bridge plug, etc.) is lowered into the casing, and cement, plugging agent, etc. are injected to perform a workover operation. After the well repairing operation is finished, the bottom packer and a bridge plug and the like used in the well repairing process need to be removed by drilling, so that the casing pipe is communicated, and subsequent continuous production is facilitated. However, in a drilling operation, it is still possible to destroy the cemented cement sheath again and result in unsuccessful workover.
Disclosure of Invention
In order to solve the problems, the invention provides a well repairing device. The well repairing device can repair the problem of external pipe channeling of an oil well and a gas well, and does not need drilling and plugging operation after well repairing is finished. The invention also provides a method for repairing the well by using the well repairing device.
A well intervention device according to a first aspect of the invention comprises: the packer comprises a through tubular main body, at least two packers are axially arranged on the outer portion of the tubular main body, a space is arranged between every two adjacent packers, an inner injection pipe is slidably mounted in the tubular main body, the upper end of the inner injection pipe is open, the lower end of the inner injection pipe in the tubular main body is closed, an outlet hole is further formed in the side wall of the inner injection pipe, and an injection hole capable of being communicated with the outlet hole is arranged in the space of the tubular main body.
In using the well servicing device according to the invention, plugging agent is injected into the interior of the inner injection pipe. The plugging agent flows out through the outlet hole and the injection hole, then flows into the damaged well cementation cement ring, and is solidified again, so that well repair is realized. In particular, since the lower end of the inner injection pipe is closed, it is not necessary to insert a plugging device such as a bottom packer, a bridge plug, or a cannula packer into the casing before injecting the plugging agent into the inner injection pipe. After the well is repaired, the inner injection pipe can be directly lifted out of the well, so that the inside of the casing pipe is easily kept smooth without drilling and plugging operations. Thus, the possibility of damaging the cement sheath or other components again due to the drilling and plugging operation is completely eliminated during the whole well repair process.
In one embodiment, the inner injection tube is configured with a stopper structure in an upper region thereof to match the upper edge of the cylindrical body, the stopper structure being located at a distance from the center of the outlet hole equal to the distance from the upper edge of the cylindrical body to the center of the injection hole. Through setting up limit structure, can guarantee that the exit hole of interior filling tube keeps aligning with the filling hole of tube-shape main part throughout, the stifled agent just can smoothly be injected into the position department of waiting to mend at well workover in-process like this, has guaranteed that well workover operation smoothly goes on. In addition, the limiting structure also enables the upper area of the inner injection pipe to be kept outside the cylindrical main body, and therefore the inner injection pipe is greatly convenient to lift subsequently.
In one embodiment, the size of the outlet aperture is larger than the size of the injection aperture. Thus, even if the positions of the outlet hole, the stopper structure, and the injection hole may be slightly deviated, it is possible to ensure that the outlet hole is aligned and communicated with the injection hole. This greatly reduces the machining difficulty.
In one embodiment, a check valve for conducting the injection hole outward is installed on the outside of the cylindrical body corresponding to the injection hole. In operation, when the pressure of the tubular body or fluid (e.g., plugging agent) within the inner injection tube is sufficiently great, the one-way valve may open allowing the fluid (e.g., plugging agent) to flow out of the well servicing device. When the pressure of the plugging agent in the inner injection pipe is lower, the one-way valve is closed, and the material exchange between the cylindrical main body or the inner injection pipe and the environment outside the sleeve pipe is avoided. Therefore, after the plugging agent is stopped being injected into the inner injection pipe, the substances outside the sleeve can be automatically prevented from flowing back to the well repairing device under the action of the one-way valve, and the well repairing work can be smoothly carried out.
In one embodiment, the check valve includes a housing fixedly coupled to an outer wall of the cylindrical body, a flow passage formed in the housing to communicate with the injection hole, and a stopper installed in the flow passage to self-block the flow passage. In a preferred embodiment, the diameter of the initial portion of the flow passage is smaller than that of the outlet portion, a limit step is formed between the initial portion and the outlet portion, and the plug is in sealing contact with the limit step through a spring. Through the structure, the larger the pressure outside the sleeve is, the tighter the flow passage of the one-way valve is, and the smooth operation of well repair is further facilitated. In addition, the spring enables the plug to automatically move in the flow channel, manual remote control is avoided, and well repairing operation is facilitated.
In a preferred embodiment, the stopper comprises a head comprising a central portion for blocking the initial portion of the flow channel and a rim in sliding contact with the outlet portion of the flow channel, an axial through-hole being configured between the central portion and the rim. The edge of the head is matched with the flow channel, so that the plug can stably slide in the flow channel. The through hole is used for allowing the fluid to flow through when the head is separated from the limit step, so that the fluid does not flow through a gap between the edge of the head and the flow passage. Therefore, the abrasion of the fluid to the edge of the head and the flow channel is avoided, and the stable sliding of the plug in the flow channel is ensured.
In one embodiment, the plug further comprises a pushrod coupled to the head, the pushrod being offset from the through hole. Preferably, the spring is connected to the push rod.
According to a second aspect of the present invention, there is provided a method of servicing a well using a servicing apparatus as hereinbefore described, comprising the steps of:
step one, perforating the casing corresponding to the stratum with the fluid channeling outside the casing,
step two, the well repairing device is put into the casing to cover the perforation area of the casing at intervals and the packer is in sealing contact with the casing,
step three, injecting the plugging agent into the inner injection pipe and pressurizing so that the plugging agent flows out of the sleeve through the outlet hole, the injection hole and the hole formed on the sleeve,
and step four, after the well repairing is finished, the inner injection pipe is lifted out of the well.
And perforating the casing to communicate the inside of the casing with the well cementing cement sheath to be repaired. Thus, the plugging agent can flow into the well cementation cement sheath to be repaired from the inside of the well repair device which is arranged in the casing, thereby realizing well repair. In the whole well repairing process, the drilling and removing operation is not needed to be carried out on the interior of the casing pipe completely, so that the secondary damage possibly caused by the drilling and removing operation is avoided.
In a preferred embodiment, between step three and step four, there is an additional step of: after the injection of the plugging agent is finished, the inner injection pipe is lifted out of the cylindrical main body, and clean water is injected from the sleeve to perform backwashing.
Compared with the prior art, the invention has the advantages that: the well repairing device can repair the water and air flow channeling problem caused by the damaged well cementing cement sheath outside the casing. In particular, during and after the repair, no drilling and plugging operations are required, completely eliminating the possibility of the drilling and plugging operations again damaging the cement sheath or other components of the well cementation.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
figure 1 schematically shows a well intervention device according to the invention.
Figure 2 schematically shows a first state diagram of a non-return valve according to the invention.
Fig. 3 schematically shows a second state diagram of the non-return valve according to the invention.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Figure 1 schematically shows the structure of a well servicing device 100 according to the invention. As shown in fig. 1, the well servicing device 100 includes a penetrating cylindrical body 4. An inner injection pipe 2 is slidably mounted inside the tubular body 4, and packers, such as packer 5 and packer 10, are axially disposed on the outside of the tubular body 4. Between the packer 5 and the packer 10 is a space 12. It should be noted that the outer diameter of the tubular body 4, together with the packer 5 and the packer 10, should be smaller than the inner diameter of the casing 13, so that the well servicing device 100 can be lowered smoothly into the interior of the casing 13. The packers 5 and 10 are well known components to those skilled in the art and will not be described in detail herein.
The lower end 14 of the inner injection pipe 2 is closed and the upper end 15 is open. The inner injection pipe 2 is a long pipe with one closed end and one open end as a whole. Outlet openings 9 are also formed in the side wall of the inner filling pipe 2. On the side wall of the cylindrical body 4, an injection hole 8 communicating with the outlet hole 9 is provided in the space 12.
In workover, the casing 13 is first perforated to form a perforated zone 11 corresponding to the formation 16 outside the casing 13 where the cross-flow occurs to communicate the formation 16 with the environment inside the casing 13. The workover device 100 is then lowered into the casing 13 to the perforation zone 11. The space 12 between the packers 5 and 10 completely covers the perforation zone 11 and the packers 5 and 10 are in close contact with the casing 13. In this way, it is avoided that plugging agents or other substances contaminate or destroy parts of the casing 13 outside the perforated zone 11 during workover. Next, the outlet hole 9 and the injection hole 8 are communicated, and then the plugging agent is injected into the inner injection pipe 2. The plugging agent flows into the formation 16 through the outlet hole 9, the injection hole 8 and the perforated area 11, thereby completing the well intervention. After the well is repaired, the inner injection pipe 2 is lifted out of the well.
In one embodiment, a joint 1 is also configured at the upper edge of the inner filling pipe 2 to facilitate the lifting out of the inner filling pipe 2.
In order to ensure that the outlet opening 9 and the injection opening 8 remain in communication during injection of the plugging agent, a radially outwardly projecting stop formation 3 is configured in the upper region of the inner injection tube 2, which stop formation 3 is adapted to the upper edge 19 of the cylindrical body 4. Further, a distance L1 from the stopper structure 3 to the center of the outlet hole 9 is equal to a distance L2 from the upper edge 19 of the cylindrical body 4 to the center of the inlet hole 8. Thus, when the stopper structure 3 is supported on the upper edge 19 of the tubular body 4, the outlet hole 9 and the inlet hole 8 are necessarily communicated. In a preferred embodiment, the size of the outlet opening 9 is larger than the size of the injection opening 8. Thus, even if the distance L1 and the distance L2 deviate slightly from the standard, the outlet hole 9 and the injection hole 8 are kept in communication (as shown in fig. 1), which greatly reduces the difficulty of machining and improves the yield.
After the injection of the plugging agent is stopped, in order to prevent the injected plugging agent from flowing back into the inner injection pipe 2, in one embodiment, the injection hole 8 may be configured to be turned on or off. As shown in fig. 1 and 2, a check valve 7 corresponding to the injection hole 8 is attached to the outside of the cylindrical body 4.
In the embodiment shown in fig. 2, the check valve 7 includes a housing 76 fixedly connected to the outer wall of the cylindrical body 4, a flow passage 77 constructed in the housing 76, and a plug 71 installed in the flow passage 77. The flow channel 77 communicates with the injection hole 8, and includes a smaller diameter starting portion 75 and a larger diameter outlet portion 72. A limit step 78 is formed between the start portion 75 and the outlet portion 72. The plug 71 is in sealing contact with the limit step 78 through the spring 73, so that the flow channel 77 is blocked or communicated.
As also shown in fig. 2, plug 71 includes a head 81 and a push rod 82, and spring 73 is wound around push rod 82. The head 81 comprises a central portion 83 blocking the initial portion 75 of the flow channel 77 and a rim 84 in sliding contact with the outlet portion 72 of the flow channel 77. An axial through-hole 74 is formed between the central part 83 and the edge 84. It should be noted that the push rod 82 is offset from the through hole 74.
In the initial state, the central portion 83 is in close contact with the limit step 78 by the spring 73, and the through hole 74 cannot conduct the initial portion 75 and the outlet portion 72, i.e., the flow passage 77 is in a blocked state (as shown in fig. 2). When the inner injection tube 2 is injected with plugging agent and pressurized, the spring 73 is compressed and the central portion 83 is separated from the limit step 78 when the pressure from the initial portion 75 (or the inner injection tube 2) is sufficient to push the stopper 71 to move. At this point, the plugging agent will flow from the initial portion 75 of the flow path 77 through the through-holes 74 to the outlet portion 72 and out of the well servicing device 100 (as shown in fig. 3). As described above, plugging agent may flow into the formation 16 through the perforated zone 11 on the casing 13 to repair the damaged well casing annulus. It can be seen that the plugging agent does not flow through the gap between the edge 84 of the head 81 and the flow channel 77. In fact, the engagement between the edge 84 and the channel 77 is only intended to allow the plug 71 to slide stably inside the channel 77. This avoids damage to the rim 84 and the channel 77 and helps to ensure a stable sliding movement of the plug 71 within the channel 77. In a preferred embodiment, the number of the through holes 74 may be plural and evenly distributed in the circumferential direction.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A well servicing device comprising:
a perforated tubular body having at least two packers axially disposed on the exterior of the tubular body, a space being provided between adjacent packers,
an inner injection pipe slidably inserted into the cylindrical body, the inner injection pipe having an open upper end and a closed lower end inside the cylindrical body, an outlet hole formed in a sidewall of the inner injection pipe,
an injection hole capable of communicating with the outlet hole is provided in a region of the cylindrical body within the space,
wherein a stopper structure matched with the upper edge of the cylindrical body is configured at the upper region of the inner injection pipe, and the distance from the stopper structure to the center of the outlet hole is equal to the distance from the upper edge of the cylindrical body to the center of the injection hole.
2. The well servicing device according to claim 1, wherein a check valve for conducting an injection hole to the outside is installed outside the cylindrical body corresponding to the injection hole.
3. The well servicing device of claim 2, wherein the check valve comprises a housing fixedly connected to an outer wall of the cylindrical body, a flow passage communicating with the injection hole is formed in the housing, and a plug for self-plugging the flow passage is installed in the flow passage.
4. A well servicing device according to claim 3, wherein the diameter of the initial portion of the flow passage is smaller than the diameter of the outlet portion, a limit step being formed between the initial portion and the outlet portion, the plug being in sealing contact with the limit step by a spring.
5. A well servicing device according to claim 4, wherein the stopper comprises a head comprising a central part blocking the initial part of the flow passage and a rim in sliding contact with the outlet part of the flow passage, an axial through-going hole being configured between the central part and the rim.
6. The well servicing device of claim 5, wherein the plug further comprises a pushrod coupled to the head, the pushrod being offset from the through-hole.
7. The well servicing device of claim 6, wherein the spring is coupled to the push rod.
8. A well servicing device according to any of claims 1 to 7, wherein the size of the outlet aperture is larger than the size of the injection aperture.
9. A method of servicing a well using a servicing device according to any of claims 1 to 8, comprising the steps of:
step one, perforating the casing corresponding to a stratum with a cross flow outside the casing,
step two, the well repairing device is lowered into the casing, the interval covers the perforation area of the casing, and the packer is in sealing contact with the casing,
step three, communicating the outlet hole with an injection hole, injecting a plugging agent into the inner injection pipe and pressurizing so that the plugging agent flows out of the sleeve through the outlet hole, the injection hole and the hole formed on the sleeve,
and step four, after the well washing and well repairing process is finished, the inner injection pipe is lifted out of the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610685655.6A CN107762443B (en) | 2016-08-18 | 2016-08-18 | Well workover device and well workover method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610685655.6A CN107762443B (en) | 2016-08-18 | 2016-08-18 | Well workover device and well workover method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107762443A CN107762443A (en) | 2018-03-06 |
| CN107762443B true CN107762443B (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610685655.6A Active CN107762443B (en) | 2016-08-18 | 2016-08-18 | Well workover device and well workover method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107762443B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108798579A (en) * | 2018-08-21 | 2018-11-13 | 陕西延长石油(集团)有限责任公司研究院 | A kind of casing repairing strengthening agent constructing device and its application method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358513A (en) * | 2008-07-08 | 2009-02-04 | 东营市祥生工贸有限责任公司 | Water injection packer |
| CN201991483U (en) * | 2011-02-28 | 2011-09-28 | 中国石油集团川庆钻探工程有限公司 | Tubular column structure suitable for packer layering adds sand fracturing |
| CN104481432A (en) * | 2014-11-24 | 2015-04-01 | 中国石油天然气股份有限公司 | Sand washing pipe column and sand washing method of low-pressure leakage well |
| CN105587286A (en) * | 2014-10-23 | 2016-05-18 | 中国石油化工股份有限公司 | Anti-losing well-flushing packer |
| CN105612308A (en) * | 2013-10-09 | 2016-05-25 | 国际壳牌研究有限公司 | Riserless completions |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7287589B2 (en) * | 2000-03-02 | 2007-10-30 | Schlumberger Technology Corporation | Well treatment system and method |
-
2016
- 2016-08-18 CN CN201610685655.6A patent/CN107762443B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358513A (en) * | 2008-07-08 | 2009-02-04 | 东营市祥生工贸有限责任公司 | Water injection packer |
| CN201991483U (en) * | 2011-02-28 | 2011-09-28 | 中国石油集团川庆钻探工程有限公司 | Tubular column structure suitable for packer layering adds sand fracturing |
| CN105612308A (en) * | 2013-10-09 | 2016-05-25 | 国际壳牌研究有限公司 | Riserless completions |
| CN105587286A (en) * | 2014-10-23 | 2016-05-18 | 中国石油化工股份有限公司 | Anti-losing well-flushing packer |
| CN104481432A (en) * | 2014-11-24 | 2015-04-01 | 中国石油天然气股份有限公司 | Sand washing pipe column and sand washing method of low-pressure leakage well |
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| Publication number | Publication date |
|---|---|
| CN107762443A (en) | 2018-03-06 |
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