CN115217441A - Ball-throwing device for cement injection plug and cement injection plug process thereof - Google Patents
Ball-throwing device for cement injection plug and cement injection plug process thereof Download PDFInfo
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- CN115217441A CN115217441A CN202210894055.6A CN202210894055A CN115217441A CN 115217441 A CN115217441 A CN 115217441A CN 202210894055 A CN202210894055 A CN 202210894055A CN 115217441 A CN115217441 A CN 115217441A
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- 239000004568 cement Substances 0.000 title claims abstract description 111
- 238000002347 injection Methods 0.000 title claims abstract description 33
- 239000007924 injection Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007790 scraping Methods 0.000 claims abstract description 61
- 239000002002 slurry Substances 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims description 27
- 238000005086 pumping Methods 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000011440 grout Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
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- 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 provides a cement injection plug ball injection device, which comprises a ball injection pipe, a first pipeline assembly, a second pipeline assembly and a third pipeline assembly, wherein the ball injection pipe is used for communicating an internal channel of a drill rod; the ball throwing device is characterized by further comprising a first baffle assembly and a second baffle assembly which are movably inserted on the ball throwing pipe, a first pipe scraping plug and a second pipe scraping plug are respectively placed above the first baffle assembly and the second baffle assembly, and the outer walls of the first pipe scraping plug and the second pipe scraping plug are tightly abutted to the inner wall of the ball throwing pipe and can slide in the ball throwing pipe. The invention also provides a cement injection plug process applying the cement injection plug ball-throwing device. The invention overcomes the problems that the cement plug is easy to pollute, the quality of the cement plug column is poor, the phenomena of sinking of the cement plug surface and unreal detection are easy to occur in the existing balanced method cement injection plug process, can prevent cement slurry from being polluted, improves the quality of the cement plug, ensures the safety of operation and improves the time efficiency of the balanced method cement injection plug operation.
Description
Technical Field
The invention relates to the technical field of offshore deep well drilling, in particular to a cementing plug ball-throwing device and a cementing plug process thereof.
Background
In offshore deep well drilling operation, when operations such as sidetracking, plugging, backfilling or well abandoning are needed, cementing plug operation is needed, and the currently common construction method is balanced cementing plug. The balance method cement plug is a method for driving the cement plug by utilizing the balance principle. The required cement slurry amount is conveyed into the well through a drill pipe or an oil pipe, when the cement slurry surfaces inside and outside the pipe are equal, the drill pipe or the oil pipe is slowly lifted, and the cement plug is left at the original position.
The construction principle is as follows: the drill pipe (or oil pipe) is lowered to the bottom depth of the preset cement plug, and before or after the cement slurry is pumped, a proper amount of pad fluid is pumped to prevent the cement slurry from being polluted. The amount of pad fluid before and after the cement slurry should be such that they are of the same height (density) in the annulus and in the drill pipe. The mud density of the displacement cement slurry in the drill rod is consistent with the mud density outside the drill rod so as to achieve the balance of the pressure inside and outside the pipe, and the cement slurry is displaced to the calculated depth of the top of the cement plug in the displacement process. It is common practice to leave a certain displacement margin to prevent back-spray of mud onto the drill floor when the drill pipe is removed after displacement and to allow the cement plug to reach hydraulic equilibrium. The construction procedure is as follows: 1) The smooth drilling rod is drilled to the bottom of the designed cement plug to circulate the slurry, so that the slurry density in the well is uniform and consistent; 2) Pumping in pre-fluid, pumping in cement slurry and pumping in post-fluid; 3) The mud replaces the cement paste to the designed position; 4) And (5) pulling the drill to the designed cement plug surface, and circularly cleaning the redundant cement paste.
However, in the prior art, when the balance method is used for cement plug injection, the cement plug is influenced by factors of design depth and design height (volume), and is easily polluted in a drill rod in the pumping process of the drill rod, so that the quality of the cement plug is influenced, and the phenomena of sinking and unrealistic detection of the surface of the cement plug are easily caused. Therefore, it is necessary to design new cement injection equipment and process, so as to improve the quality of the cement plug and ensure the operation safety and the construction continuity.
Disclosure of Invention
The invention aims to solve the problems that a cement plug is easy to pollute, the quality of a cement plug column is poor, and the phenomena of sinking of the cement plug surface and unreal detection are easy to occur in the existing balanced method cement injection plug process, and provides a cement injection plug ball-throwing device and a cement injection plug process thereof. The invention can prevent cement slurry from being polluted, improve the quality of the cement plug, ensure the safety of the balance method cement injection plug process operation and improve the timeliness of the balance method cement injection plug operation.
In order to solve the technical problems, the invention adopts the technical scheme that:
a ball injection device for a cementing plug comprises a ball injection pipe, a first pipeline assembly, a second pipeline assembly and a third pipeline assembly, wherein the ball injection pipe is used for being communicated with an internal channel of a drill rod;
the ball tube scraping device is characterized by further comprising a first baffle assembly which is movably inserted on the ball tube and located between the first pipeline assembly and the second pipeline assembly, a second baffle assembly which is movably inserted on the ball tube and located between the second pipeline assembly and the third pipeline assembly, a first pipe scraping plug which is placed above the first baffle assembly, and a second pipe scraping plug which is placed above the second baffle assembly, wherein the outer walls of the first pipe scraping plug and the second pipe scraping plug are tightly abutted to the inner wall of the ball tube and can slide in the ball tube.
It should be noted that the positions of the first pipe scraping plug and the second pipe scraping plug are reasonably arranged, so that different liquids can be conveniently pumped from different positions in a regulating and controlling manner, the first pipe scraping plug and the second pipe scraping plug are controlled to be released through the first baffle assembly and the second baffle assembly, and the pipe scraping plugs can be regulated and controlled to be released when the liquids are pumped in, so that the inner wall of the drill rod can be cleaned, and the quality of the cement paste plunger is improved.
Furthermore, the first pipeline assembly comprises a first pipeline used for pumping the postposition liquid and a first shutoff valve arranged on the first pipeline, the second pipeline assembly comprises a second pipeline used for pumping the cement paste and a second shutoff valve arranged on the second pipeline, and the third pipeline assembly comprises a third pipeline used for opening circulation and pumping the postposition liquid and a third shutoff valve arranged on the third pipeline.
Furthermore, the first shut-off valve, the second shut-off valve and the third shut-off valve are one of a butterfly valve, a ball valve and a gate valve.
It should be noted that the on-off of the first pipeline, the second pipeline and the third pipeline is opened and closed by the corresponding shut-off valves, the shut-off valves can be manually opened and closed or automatically opened and closed, and the realization of the purpose of the invention is not affected by the exact on-off sequence of the different pipelines and the specific on-off mode of the shut-off valves.
Furthermore, the first baffle assembly comprises a first baffle with one end movably inserted in the ball throwing pipe, a first hand wheel connected with the other end of the first baffle and used for adjusting the position of the first baffle, the second baffle assembly comprises a second baffle with one end movably inserted in the ball throwing pipe, and a second hand wheel connected with the other end of the second baffle and used for adjusting the position of the second baffle. In this way, the insertion positions of the first baffle and the second baffle can be adjusted by manually rotating the first hand wheel and the second hand wheel, so that the first pipe scraping plug and the second pipe scraping plug are released.
Furthermore, the first pipe scraping plug and the second pipe scraping plug are rubber pipe scraping plugs and have deformation elastic quantity of 350% -450%. It should be noted that the rubber pipe wiper plug has large deformation elasticity, so that the rubber pipe wiper plug can pass through a small channel without damaging the body, can easily pass through an internal limiting channel, is suitable for almost all types of cement paste and displacement liquid, and has good cleaning effect on the inner wall of a pipe.
Furthermore, the first wiper plug is spherical or cylindrical, and the second wiper plug is also spherical or cylindrical.
Further, the diameter of the first pipe scraping plug and the diameter of the second pipe scraping plug are larger than the inner diameter of the pipe of the drill rod.
Further, the first wiper plug and the second wiper plug are identical in shape.
The invention also provides a cement injection plug process applying the cement injection plug ball-throwing device, which specifically comprises the following steps:
s1: installing a ball throwing pipe at the inlet end of the drill rod, communicating the ball throwing pipe with the inner channel of the drill rod, lowering the drill rod to the bottom of the designed cement plug position, opening a passage of a third pipeline assembly, and communicating the third pipeline assembly with the inner part of the offshore deep well;
s2: pumping a certain amount of pad fluid from the third pipeline assembly, and then closing the passage of the third pipeline assembly;
s3: moving the second baffle plate assembly to enable the lower part of the second pipe scraping plug not to be blocked;
s4: opening a passage of the second pipeline assembly, pumping a certain amount of cement slurry into the second pipeline assembly, pushing the second pipe scraping plug to move downwards by the cement slurry, cleaning the inner wall of the drill pipe in the downward process, preventing the pollution of the cement slurry, and then closing the passage of the second pipeline assembly;
s5: moving the first baffle plate assembly to enable the lower part of the first pipe scraping plug not to be blocked;
s6: opening a passage of the first pipeline assembly, pumping a certain amount of post fluid from the first pipeline assembly, pushing the first pipe scraping plug to move downwards by the post fluid, scraping cement slurry adhered to the inner wall of the drill pipe in the downward process, simultaneously isolating the post fluid from the cement slurry, and pushing the cement slurry to reach a designed position by the post fluid;
s7: and (4) the drill rod is drilled to the surface of the designed cement plug position, and then the excess cement slurry in the drill rod is circularly cleaned, so that the cement injection plug operation is completed.
Further, the pad fluid and the post fluid are the same fluid.
Therefore, because the cement plug is influenced by the design depth, the design height or the volume factor, the cement plug is easy to pollute in the drill rod in the pumping process of the drill rod, the quality of the cement plug is influenced, and the phenomena of sinking and unreal detection of the surface of the cement plug are easy to cause.
(first, the device is completely written, then the process is written)
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the cement plug ball-throwing device, the positions of the first pipe scraping plug and the second pipe scraping plug are reasonably arranged, so that different liquids can be conveniently regulated and controlled to be pumped from different positions, the first baffle assembly and the second baffle assembly are used for controlling the release of the first pipe scraping plug and the second pipe scraping plug, the release of the pipe scraping plugs when the liquids are pumped can be regulated and controlled, the inner wall of a drill rod can be cleaned, and the quality of a cement paste plunger is improved.
(2) The cement plug ball-throwing device is applied to the cement plug operation, and the first pipe-scraping plug and the second pipe-scraping plug in the cement plug ball-throwing device are utilized to clean slurry, cement slurry and residual solid on the inner wall of the drill rod and can also be used for isolating liquid in the drill rod, so that the cement slurry is prevented from being polluted, the quality of a cement plug column is improved, the operation safety is ensured, and the operation timeliness is improved.
Drawings
FIG. 1 is a schematic structural view of a cementing plug ball-throwing device according to the present invention;
FIG. 2 is a schematic view of the application of the cementing plug ball-throwing device of the present invention;
FIG. 3 is a schematic view of the cementing plug process of the present invention;
figure 4 is a schematic view of the invention with the cementing plug at the end and the drill pipe removed.
The graphic symbols are as follows:
1-ball throwing pipe, 11-first pipeline component, 112-first shut-off valve, 12-second pipeline component, 122-second shut-off valve, 13-third pipeline component, 132-third shut-off valve, 2-first baffle component, 21-first baffle, 31-second baffle, 3-second baffle component, 4-first pipe scraping plug, 5-second pipe scraping plug, 7-postposition liquid, 8-drill pipe, 9-cement paste and 10-prepasition liquid.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to the specific situation.
Example 1
As shown in fig. 1, a cement plug ball-throwing device comprises a ball-throwing pipe 1 for communicating with an internal channel of a drill rod 8, a first pipeline assembly 11, a second pipeline assembly 12 and a third pipeline assembly 13 which are communicated with the ball-throwing pipe 1 and used for pumping different liquids, wherein the first pipeline assembly 11, the second pipeline assembly 12 and the third pipeline assembly 13 are sequentially arranged along a well-exploring direction of the ball-throwing pipe 1;
still including the activity insert locate throw on bulb 1 and be located first pipeline subassembly 11 and second pipeline subassembly 12 between first baffle subassembly 2, the activity is inserted and is located throw on bulb 1 and be located second baffle subassembly 3 between second pipeline subassembly 12 and the third pipeline subassembly 13, place in the first plug 4 of scraping of first baffle subassembly 2 top to and place in the second plug 5 of scraping of second baffle subassembly 3 top, the inseparable butt of the outer wall of first plug 4 of scraping and second plug 5 of scraping is on throwing the inner wall of bulb 1 and can slide in throwing bulb 1.
As shown in fig. 1, the first pipe assembly 11 includes a first pipe for pumping the post fluid 7 and a first shut-off valve 112 disposed on the first pipe, the second pipe assembly 12 includes a second pipe for pumping the cement slurry 9 and a second shut-off valve 122 disposed on the second pipe, and the third pipe assembly 13 includes a third pipe for opening the circulation and pumping the pre fluid 10 and a third shut-off valve 132 disposed on the third pipe.
In this embodiment, the first shut-off valve 112, the second shut-off valve 122, and the third shut-off valve 132 are ball valves.
As shown in fig. 1, the first baffle assembly 2 includes a first baffle 21 having one end movably inserted into the ball throwing tube 1, a first hand wheel connected to the other end of the first baffle 21 and used for adjusting the position of the first baffle 21, the second baffle assembly 3 includes a second baffle 31 having one end movably inserted into the ball throwing tube 1, and a second hand wheel connected to the other end of the second baffle 31 and used for adjusting the position of the second baffle 31. In this way, the insertion positions of the first baffle 21 and the second baffle 31 can be adjusted by manually rotating the first hand wheel and the second hand wheel, thereby releasing the first wiper plug 4 and the second wiper plug 5.
The cementing plug bowling device of this embodiment is through rationally laying the first position of scraping stopcock 4 and second and scraping stopcock 5 to can be convenient for regulate and control different liquid of position pump income from, scrape the first release of stopcock 4 and second and scrape stopcock 5 through first baffle subassembly 2 and second baffle subassembly 3 control, can regulate and control and scrape the stopcock and release when what kind of liquid of pump income, in order to reach clean 8 inner walls of drilling rod, improve the quality of grout 9 plungers.
Example 2
This embodiment is similar to embodiment 1, except that in this embodiment: the first pipe scraping plug 4 and the second pipe scraping plug 5 are rubber pipe scraping plugs and have deformation elastic quantity of 350% -450%. The deformation elastic quantity of the rubber pipe scraping plug is large, so that the rubber pipe scraping plug can pass through a small channel without damaging a body, easily passes through an internal limiting channel, is suitable for cement paste 9 and displacement liquid of almost all types, and has a good cleaning effect on the inner wall of a pipe.
In this embodiment, the first wiper plug 4 is spherical, and the second wiper plug 5 is also spherical.
In this embodiment, the first wiper plug 4 and the second wiper plug 5 have a diameter larger than the inner diameter of the pipe of the drill rod 8.
Other structures and principles of this embodiment are the same as those of embodiment 1.
Example 3
This embodiment is similar to embodiment 1, except that in this embodiment: the first wiper plug 4 is spherical in shape, and the second wiper plug 5 is cylindrical in shape.
Other structures and principles of this embodiment are the same as those of embodiment 1.
Example 4
As shown in fig. 2 to 4, the present embodiment is a cement plug process using the above-mentioned cement plug ball-throwing apparatus, which specifically includes the following steps:
s1: installing the ball throwing pipe 1 at the inlet end of the drill rod 8, enabling the ball throwing pipe 1 to be communicated with an internal channel of the drill rod 8, lowering the drill rod 8 to the bottom of a designed cement plug position, opening a third shut-off valve 132, and conducting a third pipeline, so as to conduct the third pipeline and the interior of the offshore deep well;
s2: pumping a quantity of pad 10 from the third conduit and closing the third shut-off valve 132;
s3: rotating the second hand wheel, and moving the inserting position of the second baffle 31 to enable the lower part of the second pipe scraping plug 5 not to be blocked;
s4: opening a second shut-off valve 122, conducting a second pipeline, pumping a certain amount of cement slurry 9 from the second pipeline, pushing a second pipe scraping plug 5 to move downwards by the cement slurry 9, cleaning the inner wall of the drill pipe 8 in the downward process, preventing the pollution of the cement slurry 9, and then closing the second shut-off valve 122;
s5: rotating the first hand wheel, and moving the first baffle plate 21 to enable the lower part of the first pipe scraping plug 4 not to be blocked;
s6: opening the first shut-off valve 112, conducting the first pipeline, pumping a certain amount of the post liquid 7 from the first pipeline, pushing the first pipe scraping plug 4 to move downwards by the post liquid 7, scraping cement slurry 9 adhered to the inner wall of the drill pipe 8 in the downward process, isolating the post liquid 7 from the cement slurry 9, and pushing the cement slurry 9 to the designed position by the post liquid 7;
s7: and (4) lifting the drill rod 8 to the surface of the designed cement plug position, and then circularly cleaning the excess cement slurry 9 in the drill rod 8 to finish the operation of cement plug injection.
In this embodiment, the pad fluid 10 and the post fluid 7 are the same fluid and have the same density.
Like this, because the cement stopper receives the design degree of depth and the influence of design height or volume factor, it pollutes in drilling rod 8 easily to go into the in-process through drilling rod 8 pump, influence the quality of cement stopper, cause the cement stopper face to sink easily and "visit not real" phenomenon, in this embodiment, through being applied to the cement stopper operation with stopper cement stopper bowling device, utilize first pipe stopper 4 and the second of scraping in the cement stopper bowling device to scrape mud on the clean drilling rod 8 inner wall of pipe stopper 5, grout 9 and residual solid matter, also can be used for keeping apart the liquid in drilling rod 8, thereby prevent that grout 9 from being polluted, improve cement stopper post quality, guarantee operation safety, improve the operation ageing.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The ball injection device for the cement injection plug is characterized by comprising a ball injection pipe (1) communicated with an internal channel of a drill rod, a first pipeline assembly (11), a second pipeline assembly (12) and a third pipeline assembly (13) which are communicated with the ball injection pipe (1) and used for pumping different liquids, wherein the first pipeline assembly (11), the second pipeline assembly (12) and the third pipeline assembly (13) are sequentially arranged along the well exploring direction of the ball injection pipe (1);
the pipeline cleaning device is characterized by further comprising a first baffle assembly (2) which is movably inserted on the ball throwing pipe (1) and located between the first pipeline assembly (11) and the second pipeline assembly (12), a second baffle assembly (3) which is movably inserted on the ball throwing pipe (1) and located between the second pipeline assembly (12) and the third pipeline assembly (13), a first pipe scraping plug (4) which is placed above the first baffle assembly (2), and a second pipe scraping plug (5) which is placed above the second baffle assembly (3), wherein the outer walls of the first pipe scraping plug (4) and the second pipe scraping plug (5) are tightly abutted to the inner wall of the ball throwing pipe (1) and can slide in the ball throwing pipe (1).
2. The cementing plug pitching apparatus according to claim 1, wherein the first pipe assembly (11) comprises a first pipe for pumping in post fluid and a first shut-off valve (112) disposed on the first pipe, the second pipe assembly (12) comprises a second pipe for pumping in cement slurry and a second shut-off valve (122) disposed on the second pipe, and the third pipe assembly (13) comprises a third pipe for opening circulation and pumping in pre fluid and a third shut-off valve (132) disposed on the third pipe.
3. The cementing plug ball injection apparatus of claim 2, wherein the first shut-off valve (112), the second shut-off valve (122), and the third shut-off valve (132) are one of a butterfly valve, a ball valve, and a gate valve.
4. The cementing plug ball-throwing device according to claim 1, wherein the first baffle assembly (2) comprises a first baffle (21) with one end movably inserted into the ball-throwing pipe (1), a first hand wheel connected with the other end of the first baffle (21) and used for adjusting the position of the first baffle (21), the second baffle assembly (3) comprises a second baffle (31) with one end movably inserted into the ball-throwing pipe (1), and a second hand wheel connected with the other end of the second baffle (31) and used for adjusting the position of the second baffle (31).
5. The cementing plug pitching device according to claim 1, wherein the first wiper plug (4) and the second wiper plug (5) are rubber wiper plugs, and have a deformation deflection of 350-450%.
6. The cementing plug ball injection device according to claim 5, characterized in that the first wiper plug (4) is spherical or cylindrical in shape and the second wiper plug (5) is also spherical or cylindrical in shape.
7. The cementing plug ball injector of claim 6, wherein the first wiper plug (4) and the second wiper plug (5) have a diameter larger than the pipe inner diameter of the drill pipe.
8. The cementing plug pitching device according to claim 7, characterized in that the first wiper plug (4) and the second wiper plug (5) are identical in shape.
9. A cement plug process using the cement plug ball-throwing apparatus according to any one of claims 1 to 8, comprising the steps of:
s1: installing the ball throwing pipe (1) at the inlet end of the drill rod to enable the ball throwing pipe (1) to be communicated with an internal channel of the drill rod, lowering the drill rod to the bottom of a designed cement plug position, opening a passage of the third pipeline assembly (13), and communicating the third pipeline assembly (13) with the interior of the offshore deep well;
s2: pumping a certain amount of pad fluid from the third pipeline assembly (13), and then closing the passage of the third pipeline assembly (13);
s3: moving the second baffle assembly (3) to enable the lower part of the second pipe scraping plug (5) not to be blocked;
s4: opening a passage of a second pipeline assembly (12), pumping a certain amount of cement slurry from the second pipeline assembly (12), pushing a second pipe scraping plug (5) to move downwards by the cement slurry, cleaning the inner wall of a drill pipe in the downward process, preventing water slurry pollution, and then closing the passage of the second pipeline assembly (12);
s5: moving the first baffle plate component (2) to enable the lower part of the first pipe scraping plug (4) not to be blocked;
s6: opening a passage of the first pipeline assembly (11), pumping a certain amount of post fluid from the first pipeline assembly (11), pushing the first pipe scraping plug (4) to move downwards by the post fluid, scraping cement slurry adhered to the inner wall of the drill pipe in the moving downwards process, simultaneously isolating the post fluid from the cement slurry, and pushing the cement slurry to a designed position by the post fluid;
s7: and (4) tripping the drill rod to the surface of the designed cement plug position, and then circularly cleaning the excess cement slurry in the drill rod to finish the operation of the cement plug.
10. The cementing process of claim 9, wherein the pad fluid and the post fluid are the same fluid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210894055.6A CN115217441A (en) | 2022-07-27 | 2022-07-27 | Ball-throwing device for cement injection plug and cement injection plug process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210894055.6A CN115217441A (en) | 2022-07-27 | 2022-07-27 | Ball-throwing device for cement injection plug and cement injection plug process thereof |
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