CN101718189B - Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top - Google Patents
Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top Download PDFInfo
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- CN101718189B CN101718189B CN200910241703A CN200910241703A CN101718189B CN 101718189 B CN101718189 B CN 101718189B CN 200910241703 A CN200910241703 A CN 200910241703A CN 200910241703 A CN200910241703 A CN 200910241703A CN 101718189 B CN101718189 B CN 101718189B
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Abstract
The invention relates to a completed well body structure with a temporary plugging function screen pipe and a well completion method for injecting cement on the top. The well body structure comprises a multifunctional well washing valve, a screen pipe, a blind plate, a pipe external isolator and a grading cement injector which are sequentially connected from bottom, top to a well opening; the screen pipe with the temporary plugging function is adopted, and each through hole of a center pipe of the screen pipe is provided with a plugging cover. The well completion method comprises the following steps of: firstly, constructing a pipe string of the well body structure with the temporary plugging screen pipe, taking the pipe string to the position by a tool, carrying out slurry replacement by reverse circulation, opening the well washing valve under the action of pressure and establishing a circulating passage; after the slurry replacement is finished, throwing a ball into the pipe string, pressing the pipe external isolator, continuously pressurizing, opening the grading cement injector and carrying out top cement injection well fixing operation; putting a drill down to drill the blind plate and the plugging cover of the screen pipe; and putting into production. The invention can solve the problem of slurry cake plugging in the process of putting down the screen pipe, greatly simplify the traditional well completion slurry replacement operation way, reduce the drill-down frequency, save the operation time and improve the replacement efficiency.
Description
Technical field
The invention belongs to the oil gas well mining technical field, relate in particular to a kind of completion method of completion interval of well body structure and the crest water flooding mud thereof with the temporary plugging function screen casing.
Background technology
Sieve tube completion has been a kind of completion mode that generally adopts both at home and abroad at present.Wherein the effect of screen casing provides the passage that gas stream gets into pit shaft; For sand output well, play the effect of strainer, can effectively prevent the various harm that formation sand production causes; For the oil gas well that does not shake out, mainly play and keep hole stability and prevent that chip from getting into the effect of pit shaft.But implement screen sand control completion process need and effectively solve the blockage problem of drilling fluid the screen casing and the borehole wall.
At first, the structure that needs to introduce existing conventional screen casing is arranged, it can be divided into two big types:
The first kind is to be the screen casing of representative with cutting seam sieve tube, star-gapping sieve tube: be characterized on the tubing and casing body through blade, cut, or inlay filter element (filter medium is mainly wire lath, metal wool) after the boring and play through-flow, sand control effect.
Second type is to be the screen casing of representative with wire-wrapped screen, metal screen cloth sand screen and restraining liner; Be characterized in boring additional filter media on the tubing and casing body of circular hole; Filter element structure and material can be according to actual conditions differences to some extent, and the tubular filter medium is sleeved on back welding fabrication on the boring tubing and casing.
More than two types of screen casings at home and abroad use in a large number in the barefoot completion; Wherein cutting seam sieve tube is mainly used in the formation sand production particle more slightly or under the situation of not shaking out, and wrapping wire, wire lath, metal wool etc. as the screen casing of filter medium be mainly used in the formation sand production particle be in, under the situation of fine sand.
In the oil gas well completion work progress; Screen casing is lowered to usually at first, is lowered in the process at pipe string that original mud (water, solid particle, additive etc.) can get in the screen casing through the screen casing filter medium under the inside and outside differential pressure effect in the well, along with screen insertion arrival assigned address; Can form mud cake on screen casing filter medium surface; Filter medium is inner can to form particle deposition, causes the screen casing permeability decrease, directly influences the oil gas well production.
Be lowered to process and mud returns the blockage problem that causes in row's process in order effectively to solve screen casing in completion, each state has all taked measure targetedly.Mainly contain dual mode at present and solve the blockage problem of mud to screen casing, every kind of scheme has its pluses and minuses.
Present stage, typical bore hole sieve tube completion mainly contained two kinds of completion mode:
1, tail tube hanging screen casing mode, the pipe string structure is following, connects successively from bottom to up multi-functional flushing valve, screen casing, hanging packer are set;
2, crest water flooding mud mode, the pipe string structure is following, connects successively from bottom to up multi-functional flushing valve, screen casing, blind plate, external packer of pipe, stage cementing device and sleeve pipe are set, until well head.
Adopt conventional screen casing to carry out in the completion process, take following well-flushing mode usually according to the completion mode difference:
A) tail tube hanging screen casing mode---circulation is for slurry block releasing technique 1 (referring to Fig. 1)
When the bore hole sieve tube completion, earlier flushing valve 1, screen casing 2, hanging packer 4, well-flushing pipe string 3 are connected back assigned address in the well down successively, flushing valve is shown in an open position at this moment; Just is carrying out or counter suppressing on ground, and the cleaning completion fluid will arrive the annular space of well and screen casing through well-flushing pipe string 3, flushing valve 1, set up circulation; Through circulation the drilling mud displacement is come out, carry out pitching, the passage between closed well washing pipe string 3 and the flushing valve 1 in the pipe subsequently; Pressure is continued to increase in ground; Make hanging packer 4 do extension, seat envelope, and make hanging packer 4 and running tool realize separating, propose under running tool and the well-flushing pipe string 3 subsequently.Through above operation, can realize that the completion of a pipe string sets, replaces slurry, pickling operation.
Utilize multi-functional well washing apparatus just carrying out or anti-circulation well cleanup; For behind the slurry again pitching suppress and sit to hang and the envelope that expands; Mud can avoid the screen casing blockage problem to take place not through screen casing in whole washing well process, and the risk that is difficult to trip out was blocked in existence when the well-flushing pipe string 3 that still is lowered in advance proposed.
B) tail tube hanging screen casing mode---circulation is for slurry block releasing technique 2 (see figure 2)s
When the bore hole sieve tube completion, earlier with flushing valve 1, screen casing 2, hanging packer 4, connect back assigned address in the well down successively, this moment, flushing valve 1 was in the closed position; Carry out pitching in the pipe subsequently, the passage between sealing running tool and the screen casing, ground increases pressure; Make hanging packer 4 do extension, seat envelope, and make hanging packer 4 and running tool realize separating, propose running tool; Be lowered under the well-flushing pipe string 3 subsequently, when well-flushing pipe string 3 front ends arrive flushing valve 1 flushing valve 1 disclosed out, set up circulation canal; Replace the slurry operation, finish the back and propose 3 operations of well-flushing pipe string.
In whole completion process, can't avoid being lowered to screen casing blockage problem generation in the process, the big quantity of fluid of well-flushing circulation time is prone to cause screen casing to damage through screen casing simultaneously.Also must be lowered to well-flushing pipe string 3 during operation separately and replace the slurry operation.
C) crest water flooding mud mode---circulation is for the slurry block releasing technique
With tail tube hanging screen casing mode---circulation is similar for slurry block releasing technique 2, no longer details, and also must be lowered to well-flushing pipe string during operation separately and replace the slurry operation.
More than several kinds of modes all need be lowered to well-flushing pipe string again and replace the slurry de-plugging, increased working procedure on the one hand, prolong duty cycle, strengthened the completion cost, increased on the other hand and gone into well tool and operation pipe string quantity, also strengthened operating risk.
Summary of the invention
The purpose of this invention is to provide a kind of completion interval of well body structure with the temporary plugging function screen casing, under this kind structure design, can overcome in the screen insertion process of prior art the mud cake blockage problem.
Another object of the present invention provides a kind of completion method of crest water flooding mud, and it has changed existing sieve tube completion operation, has reduced the complexity of traditional well-completing process, can effectively solve the mud cake blockage problem in the screen insertion process simultaneously.
For realizing above-mentioned purpose, the present invention takes following design scheme:
A kind of completion interval of well body structure with the temporary plugging function screen casing; Be connected with multi-functional flushing valve, screen casing, blind plate, external packer of pipe, stage cementing device successively until well head from bottom to up; Described screen casing adopts the screen casing of band temporary plugging function; Wherein, this screen casing with temporary plugging function has the filter sleeve of filtration beds to constitute by central tube and outer the attaching with some through holes on the tube wall, and each through hole is equipped with blanking cover.
The blanking cover that through hole on the said screen casing tube wall with temporary plugging function sets is through being threaded, welding, riveting or being embedded on each through-hole wall.This blanking cover is cylinder, and the cylinder external cylindrical surface can have the syndeton with the through hole coupling, and blanking cover is provided with a blind hole towards the central tube end face.
A kind of completion method of crest water flooding mud, its method step is following:
1) construction such as the above-mentioned band pipe string of the completion interval of well body structure of stifled screen casing temporarily at first is connected with multi-functional flushing valve, screen casing, blind plate, external packer of pipe, stage cementing device until well head from bottom to up successively;
2) utilize running tool that the pipe string of step 1) construction is transferred and put in place, with the ground connecting line, anti-circulation is carried out mud for slurry, opens flushing valve under pressure, sets up circulation canal;
3) after slurry replacement finishes, drop into steel or ball in the pipe string, suppress external packer of pipe, continue rising pressure, open stage cementing device, carry out the well cementing operation of crest water flooding mud;
4) after the well cementation of top, following boring removed blind plate and bored the blanking cover of driving screen casing;
5) go into operation.
The present invention is through to having the comprehensive study that sand control technique and bore hole sieve tube completion mode combine now, and to the blockage problem that causes after the mud diafiltration, the sieve tube completion system architecture of blanking cover sand control and supporting completion technology for washing well are with in research and development.Technology of the present invention is mainly used in the oil gas well shaft building process; Be applicable in horizontal well, sidetracked hole, the directional well bore hole sieve tube completion process; It utilizes openable temporarily stifled screen casing; Open in the time of necessary,, reach near desirable prouctiveness to remove mud obstruction surperficial in processes such as screen insertion and removing annular space mud in the pit shaft easily to the screen casing filtration beds.
Advantage of the present invention is:
1, the design of system architecture of the present invention; At first stopped pipe string and be lowered to that original mud can be through in the screen casing filter medium entering screen casing under the inside and outside differential pressure effect in the well in the process; Make go into the well and the slurry replacement process in can play a very good protection to the screen casing filtration beds; Avoid forming filter cake and stop up screen casing, drop to minimum to the influence of screen casing mud on filtration beds surface.
2, the design of system architecture of the present invention, making does not need to be lowered to separately well-flushing pipe string for the slurry de-plugging time, can directly instead circulate for slurry de-plugging operation.
3, completion method of the present invention can be simplified existing completion for the slurry operating type greatly effectively preventing and reducing mud in the pit shaft to the obstruction of sand control screen filtration beds simultaneously, reduces and bores number of times down, saves the activity duration, improves displacement efficiency.
Description of drawings
Fig. 1 is that prior art completion method one is implemented view.
Fig. 2 is another enforcement view of prior art completion method.
Fig. 3 implements view for the completion method of crest water flooding mud of the present invention.
Fig. 4 is the temporarily stifled screen construction sketch map (original state before the completion practice) in the completion interval of well body structure of band temporary plugging function screen casing.
Fig. 5 is the blanking cover structural representation of temporarily stifled screen casing.
Fig. 6 opens the job state structural representation for the temporarily stifled screen casing in the completion interval of well body structure of the present invention.
Arrow direction indication among above-mentioned Fig. 1 to Fig. 3 representes to suppress the direction of setting up circulation canal.
The specific embodiment
Completion interval of well body structure form of the present invention adopts form of structure shown in Figure 3; Be connected with multi-functional flushing valve 1, screen casing 2, blind plate 3, external packer of pipe 4 and stage cementing device 5 successively until well head from bottom to up; Important improvement point of the present invention is the brand new design to screen casing 2; Thereby realize completion method of the present invention, and be superior to the completion method of prior art greatly.
Referring to Fig. 4; The screen casing body 2 that the present invention has temporary plugging function is constituted by outer filter ruffle excessively (overcoat 23, filtration beds 22 are integrated) and inner central tube 21; The tubing and casing through hole (boring) of the some API of meeting standards is arranged on the central tube 21, be connected with blanking cover 24 in each through hole.
Described blanking cover 24 can through be threaded, weld, rivet, inlay or more than the mode of several kinds of combination in any be connected with each through hole on the central tube.
Referring to Fig. 5; Described blanking cover 24 is cylinder, and its end face towards the central tube outer tube wall offers a blind hole 25, is threaded or other connection features on this blanking cover cylinder external cylindrical surface; Its with the screen base pipe tube wall on the through hole offered should guarantee after being connected in blind hole depth greater than the center thickness of pipe; And blanking cover adopts to have certain bearing capacity and be prone to bore (removal) material and processes, and after drilling tool removed its part brill, the cecum of blanking cover blind hole was cut; Blind hole 25 becomes through hole (referring to Fig. 6), is able to cooperate realization the object of the invention.
Be utilized as completion system structure of the present invention and can realize easier and effective completion method, below be the practical implementation method:
The completion method concrete grammar step of crest water flooding mud of the present invention is following:
1) at first the construction band blocks up the pipe string of the completion system structure of screen casing temporarily; Be connected with multi-functional flushing valve 1, screen casing 2, blind plate 3, external packer of pipe 4 and stage cementing device 5 successively until well head from bottom to up; Screen casing wherein is the screen casing 2 of the band temporary plugging function of structure shown in Figure 4; The central tube 21 of screen casing relies on the screw thread of each screwed hole (also being through hole) on it to connect with 1 blanking cover 24, and the through hole of screen casing is in and is blocked up state temporarily;
2) with running tool the pipe string of step 1) construction is transferred to oil gas well assigned address; The central tube 21 inside and outside liquid of the screen casing 2 of this moment can't utilize the through hole on the tube wall to flow; Play the inside and outside effect that is communicated with of temporary transient quarantine center pipe, thereby filtration beds 22 surfaces of avoiding crossing filter ruffle outside form filter cake and stop up screen casing.With the ground connecting line, the anti-circulation suppressed, and flushing valve 1 is opened under pressure, sets up circulation canal;
3) after slurry replacement finishes, drop into steel (rubber) ball in the pipe string, suppress external packer of pipe 4, continue rising pressure, open stage cementing device 5, carry out the well cementing operation of crest water flooding mud;
4) well cementation back in top is bored down and is removed the above surplus water bod of blind plate; And bore the blanking cover 24 that open blind plate and brill are driven screen casing 2, after this moment, blanking cover was excised, the structure of screen casing 2 changed; As shown in Figure 6; The cecum of former blanking cover blind hole disappears, and blind hole has become through hole, utilizes this through hole can provide central tube 21 inside and outside gas stream to realize inside and outside the flowing of pipe then;
5) go into operation.
The maximum advantage of the completion method of crest water flooding mud of the present invention is: need not be lowered to well-flushing pipe string during for the slurry de-plugging, can directly instead circulate for slurry pickling de-plugging construction operation.
Above-mentioned each embodiment can not depart from the scope of the present invention down in addition some variations, thus more than explanation comprise and accompanying drawing shown in structure should be regarded as exemplary, but not in order to limit claim of the present invention.
Claims (4)
1. completion interval of well body structure with the temporary plugging function screen casing; Connect successively until well head from bottom to up multi-functional flushing valve, screen casing, blind plate, external packer of pipe, stage cementing device are set; It is characterized in that: described screen casing adopts the screen casing of band temporary plugging function; Wherein, this screen casing with temporary plugging function is constituted by central tube and the outer filter sleeve that has filtration beds that attaches with some through holes on the tube wall, and each through hole is equipped with blanking cover.
2. the completion interval of well body structure of band temporary plugging function screen casing according to claim 1 is characterized in that: the blanking cover that the through hole on the said screen casing tube wall with temporary plugging function sets is through being threaded, welding, riveting or being embedded on each through-hole wall.
3. the completion interval of well body structure of band temporary plugging function screen casing according to claim 1 is characterized in that: described blanking cover is cylinder, and the cylinder external cylindrical surface has the syndeton with the through hole coupling, and blanking cover is provided with a blind hole towards the central tube end face.
4. the completion method of a crest water flooding mud is characterized in that method step is following:
1) the pipe string of the completion interval of well body structure of construction band temporary plugging function as claimed in claim 1 screen casing at first is connected with multi-functional flushing valve, screen casing, blind plate, external packer of pipe, stage cementing device until well head from bottom to up successively;
2) utilize running tool that the pipe string of step 1) construction is transferred and put in place, with the ground connecting line, anti-circulation is carried out mud for slurry, opens flushing valve under pressure, sets up circulation canal;
3) after slurry replacement finishes, drop into steel or ball in the pipe string, suppress external packer of pipe, continue rising pressure, open stage cementing device, carry out the well cementing operation of crest water flooding mud;
4) after the top well cementation, following brills bores except that the above surplus water bod of blind plate, and the blanking cover of screen casing left by brill open blind plate and brill;
5) go into operation.
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| CN200910241703A CN101718189B (en) | 2009-12-08 | 2009-12-08 | Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top |
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| CN200910241703A CN101718189B (en) | 2009-12-08 | 2009-12-08 | Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top |
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| CN101718189B true CN101718189B (en) | 2012-10-24 |
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| CN103362473A (en) * | 2012-10-24 | 2013-10-23 | 中国石油化工股份有限公司 | Graded variable density well cementation technology |
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| CN105545247B (en) * | 2015-12-08 | 2018-08-10 | 中国石油天然气股份有限公司 | Oil and gas well cementing method |
| US10794158B2 (en) * | 2016-11-01 | 2020-10-06 | Shell Oil Company | Method for sealing cavities in or adjacent to a cured cement sheath surrounding a well casing |
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Application publication date: 20100602 Assignee: Tianjin An Dong petroleum machinery Manufacturing Co., Ltd Assignor: Anton Oilfield Services (Group) Ltd. Contract record no.: 2014990000952 Denomination of invention: Completed well body structure with temporary plugging function screen pipe and well completion method for injecting cement on top Granted publication date: 20121024 License type: Exclusive License Record date: 20141224 |
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