Symmetric form monotubular twin-well surface pipe drilling completion device and operational approachTechnical field
The invention belongs to field of oil drilling, relate to a game clock layer casing drilling completion field, particularly relate to symmetric form listCylinder twin-well surface pipe drilling completion device and operational approach.
Background technology
Oil, geological drilling wellbore construction operation in, carry out monotubular individual well under normal circumstances and be drilled well operations, it is simply thatEntering surface pipe under in one pit shaft then to cement the well, in then continuing to be drilled in surface pipe, completion is deep, after lower protective casingWell cementation, continues be drilled into completion well depth and cement the well subsequently in protective casing, this brill being China's major part drilling well at present and usingWell mode.
Typically building in neritic area, China pole and manually hold island, the mode typically boring cluster well on artificial end island develops positionIn the oil field of neritic area, pole, but man-made island is built relatively costly, and well head resource is relatively fewer, for making full use of man-made island well headResource, it is necessary to increase the cloth well density of unit are.
Summary of the invention
In view of this, it is contemplated that proposition one reduction operating cost, saving well head groove, increase unit are well spacing are closeDegree, the symmetric form monotubular twin-well surface pipe drilling completion device of favourable fully exploitation reservoir and operational approach.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that: symmetric form monotubular twin-well surface pipe boresWell completion system, including being pit shaft in the conduit being arranged in well head groove region, described conduit, described pit shaft is vertically arranged, instituteThe upper surface stating conduit is provided with horizontally disposed diplopore pedestal, and described diplopore pedestal is provided with the first pilot hole and second and guidesHole, A casing tubing string is vertically arranged in described pit shaft by described first pilot hole, and B casing tubing string passes through described firstPilot hole is vertically arranged in described pit shaft；
Described A casing tubing string is identical with the radius of B casing tubing string, described A casing tubing string and B casing tubing string phaseThe uniform setting in axis to described pit shaft.
Further, described A casing tubing string is positioned at the length of described pit shaft more than described B casing tubing string describedIn pit shaft a length of 2～4m.
Further, described A casing tubing string and B casing tubing string are integral joint casing.
Further, described A casing tubing string and B casing tubing string are box cupling and the most all polish the set of chamfering at 45 °Pipe.
Further, the upper end of described A casing tubing string is provided with the first circular arc chamfering, the upper end of described B casing tubing stringIt is provided with the second circular arc chamfering.
The method using described symmetric form monotubular twin-well surface pipe drilling completion device, it is characterised in that:
The first step: creep into, takes high rotating speed gently to press the measure of hanging up and beating；
Second step: setting of casing, corrects the concentricity of well head groove 1 and pit shaft 7 in time during setting of casing；
3rd step: well cementation, uses B casing tubing string 5 to be circulated well cementation, injects cement mortar 8 in A casing tubing string 4After, returning out outside A casing tubing string 4 and B casing tubing string 5, B casing tubing string 5 float collar is a small amount of to have to enter in setting of casingCement mortar, after cement injection terminates, turn on pump top leads to B casing tubing string 5, the most slowly bleeds off pressure, and makes a small amount of cement mortar from B well setEntering in sleeve pipe at pipe shoe, cement Hou Ning is complete；
4th step: install the casing head of A casing tubing string 4 and B casing tubing string 5, tear open after initial set 6h and get rid of concentric reducer 10, cutCone hangs up part, then installs casing head.
Further, cased step is that a) box cupling is the most all polished into by A casing tubing string 4 and B casing tubing string 545 ° of chamferings, and prepare two double public sleeve pipes, a 11m, a 10m, it is ensured that under casing head, in 10m, there is no box cupling, prevent cone from hangingDo not accomplish position；B) after installing the casing head of A casing tubing string 4, well head is corrected；C) during setting of casing, well head stays people to observe, setPipe box cupling notifies driller when crossing casing head, control lowering velocity, if well head deviation big Mobile derrick school is good；D) A casing tubing string 4Under open concentric reducer 10 the most afterwards, build well head；E) B casing tubing string is put in place for 5 times by same mode；F) small displacement top is logical followsRing prepares well cementation.
Compared with prior art, the present invention has the advantage that with good effect and is: the present invention utilizes a bite casing simultaneouslyTo double parallel casing cementing technology, two spud in in creep into towards respective direction with different kickoff point (KOP)s, to reach from singleNotch bores the purpose of two mouthfuls of wells, utilizes A casing tubing string and the difference in height of B casing tubing string simultaneously, it is ensured that raw between each wellProduce non-interference, solve platform slot deficiency and the problem of reservoir cannot be developed cmpletely, improve well head groove and useEfficiency, increases the cloth well density of unit are, easy to operate, has the advantages that to reduce operating cost, save well head groove, on landEnd island and marine drilling platform drilling well tool aspect are the most applicable.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, and the present invention's is schematic realExecute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of symmetric form monotubular twin-well surface pipe drilling completion device of the present invention；
Fig. 2 is the structural representation after A casing tubing string head installation of the present invention；
Fig. 3 is to open concentric reducer the most afterwards under A casing tubing string of the present invention, builds the structural representation of well head；
Fig. 4 is the structural representation after A casing tubing string of the present invention and the cutting of B casing tubing string upper end；
Fig. 5 is the structural representation after the casing head installation of A casing tubing string of the present invention and B casing tubing string.
Description of reference numerals:
1-well head groove；2-A well well head；3-B well well head；4-A casing tubing string；41-the first circular arc chamfering；5-B casingTubing string；51-the second circular arc chamfering；6-conduit；7-pit shaft；8-cement mortar；9-diplopore pedestal；91-the first pilot hole；92-secondPilot hole；10-concentric reducer；11-casing head.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phasesCombination mutually.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " on ", D score,Orientation or the position relationship of the instruction such as "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " areBased on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or darkThe device or the element that show indication must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that rightThe restriction of the present invention.Additionally, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicate or hint phaseTo importance or the implicit quantity indicating indicated technical characteristic.Thus, the feature defining " first ", " second " etc. canTo express or to implicitly include one or more this feature.In describing the invention, except as otherwise noted, " multiple "It is meant that two or more.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phaseEven ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；CanTo be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke YishiThe connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood by concrete conditionConcrete meaning in the present invention.
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is elaborated.
As it is shown in figure 1, the present invention is symmetric form monotubular twin-well surface pipe drilling completion device, including being admittedly arranged on well headConduit 6 in groove 1 region, is pit shaft 7 in conduit 6, and pit shaft 7 is vertically arranged, and the upper surface of conduit 6 is provided with horizontally disposed diploporePedestal 9, diplopore pedestal 9 is provided with the first pilot hole 91 and the second pilot hole 92, and A casing tubing string 4 is by the first pilot hole 91Being vertically arranged in pit shaft 7, be A well well head in A casing tubing string 4, B casing tubing string 5 is vertically set by the first pilot hole 91Putting in pit shaft 7, be B well well head in B casing tubing string 5, A casing tubing string 4 is identical with the radius of B casing tubing string 5, A wellThe uniform setting in axis of sleeve pipe tubing string 4 pit shaft 7 relative with B casing tubing string 5, utilizes a bite casing simultaneously to double parallel setsPipe cementing technology, two spud in in creep into towards respective direction with different kickoff point (KOP)s, with reach from single notch bore two mouthfulsThe purpose of well, solves platform slot deficiency and cannot develop the problem of reservoir cmpletely, improve well head groove service efficiency,Increase the cloth well density of unit are.
Preferably, A casing tubing string 4 is positioned at the length of pit shaft 7 more than a length of at pit shaft 7 of B casing tubing string 52～4m, preferably 2～3m, advantageously ensure that production non-interference between each well.
Preferably, A casing tubing string 4 and B casing tubing string 5 is integral joint casing or box cupling is the most all polished at 45 °The sleeve pipe of chamfering, it is to avoid interfere problem during entering under two serial parallel sleeve pipes.
Preferably, the upper end of A casing tubing string 4 is provided with the first circular arc chamfering 41, and the upper end of B casing tubing string 5 is provided withTwo circular arc chamferings 51, are conducive to coordinating with casing head 11, are not easy to the operator that damages, promote safety.
In actual operating process, operate in strict accordance with following steps, the first step: creep into, first have to ensure wellThe perpendicularity that eye bores, advantageously ensures that A casing tubing string 4 and B casing tubing string 5 is lower to position smoothly, takes high rotating speed gently to pressHang up and beat measure, prevented the hole deviation, drilling tool specification from being: Φ 444.5mm gear wheel × 0.40m+730/630 joint × 1.14m+ Φ558mm reamer × 1.39m+ Φ 203mm is without magnetic × 9.34m+ Φ 203mm drill collar × 54.99m+631/410 joint × 1.14m+Φ 127mm drilling rod, surface seawater creeps into, and at the bottom of drill pipe annulus flow velocity, removes drifting fully circulate so short after finishing drilling, squeeze into100 side old well drilling fluid, trip-out setting of casing；Second step: setting of casing, sleeve pipe specification is 244.5mm, a) A casing tubing string 4 and BBox cupling is the most all polished chamfering at 45 ° by casing tubing string 5, and prepares two double public sleeve pipes, a 11m, a 10m, it is ensured thatThere is no box cupling in 11 times 10m of casing head, prevent boring extension and do not accomplish position；B) as in figure 2 it is shown, install the casing head of A casing tubing string 4After 11, well head is corrected；C) during setting of casing, well head stays people to observe, and casing coupling notifies driller when crossing casing head 11, under controlPut speed, if well head deviation big Mobile derrick school is good；D) as it is shown on figure 3, A casing tubing string opens concentric reducer 10 4 times the most afterwards,Build well head；E) B casing tubing string is put in place for 5 times by same mode；F) the logical circulation in small displacement top prepares well cementation；3rd step: GuWell, 5 times deep 2～3m, preferably 3m of differing from of A casing tubing string 4 and B casing tubing string, use B casing tubing string 5 to be circulated solidWell, as common surface casing cementing, pumps into 68.5m3Cement mortar, good China G level ash 99t, for 13m3, cement returns to ground, the closeestDegree 1.88g/cm3Cementing operation is normal, the 4th step: install the casing head 11 of A casing tubing string 4 and B casing tubing string 5, initial setTear open after 6h and get rid of concentric reducer 10, cut cone and hang up part, as shown in Figure 4, slice off at plane up 17mm from diplopore pedestal 9, at A wellPolish the first circular arc chamfering 41 in the upper end of sleeve pipe tubing string 4, the second circular arc chamfering 51 of polishing in the upper end of B casing tubing string 5, thenAfter sleeve pipe is installed, after installation as shown in Figure 5.During the surface pipe well cementing operation carrying out monotubular twin-well, and commonlyAfter injecting cement mortar 8 in A casing tubing string 4 unlike well, return out outside A casing tubing string 4 and B casing tubing string 5, forEnsureing energy complete pressure testing when B casing tubing string 5 pipe string two is opened, B casing tubing string 5 float collar is a small amount of to have to enter in setting of casingCement mortar, after cement injection terminates, turn on pump top leads to B casing tubing string 5, the most slowly bleeds off pressure, and makes a small amount of cement mortar from B casingEntering in sleeve pipe at footwear, cement Hou Ning is complete can complete symmetric form monotubular twin-well top layer drilling completion technique.
Above one embodiment of the present of invention is described in detail, but described content has been only the preferable enforcement of the present inventionExample, it is impossible to be considered the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvementDeng, within all should still belonging to the patent covering scope of the present invention.