CN2477804Y - Side liner-type well completion appts. of branching well - Google Patents

Abstract

The utility model provides a well completion device used to complete a branch well with an oil drilling lateral liner tube for the development and use of old oil wells in an oil field. The technical proposal of the utility model is that a plurality of branch wells are drilled in a main well to achieve the purpose of preventing the branch wells from connecting with each, ensuring the stability and reliability of the side drilling operation. The utility model increases the unit output of oil and natural gas from a single well, improves the overall production, and has the advantages of low cost and obvious economic benefit. The device arranges a liner tube in each side well, strengthens the branch well so that all the liner tubes and the internal casings form a rigid body, avoids the mutual influence of the branch wells in the main well, prevents the branch wells from connecting each other easily, and ensures the reliability and stability of the side drilling operation. The device can be widely used for the development and use of old wells in an oil field.

Description

Lateral liner tube Multilateral Wells completion system

The utility model provides a kind of oil drilling lateral liner tube Multilateral Wells completion system of oilfield old well development and use.

Along with the development of petroleum drilling technology, Oilfield using is beaten a plurality of Multilateral Wells in a main borehole at present, to improve the well yield of petroleum and natural gas, reduces drilling cost.But Multilateral Wells construction technology complexity depends primarily on the structure of completion tool.Conventional sidetracked hole mainly divides the sleeve pipe forging to mill sidetracked hole and casing window sidetracking well.Because conventional sidetracked hole has only a side well, and the casing hanger of side well is on the sleeve pipe of main borehole.But under the situation of a plurality of side wells, be unallowed, so both influenced the unimpeded of main borehole, make each casing not have rational suspension place again.Therefore, influence the development of drilling well new technology.

At above-mentioned the problems of the prior art, the purpose of this utility model is to overcome deficiency of the prior art and a kind of oil drilling lateral liner tube Multilateral Wells completion system is provided, it has solved the problem that can beat a plurality of Multilateral Wells in a main borehole, it has not only solved a plurality of Multilateral Wells sleeve pipes rational suspension place, make main borehole unimpeded, and can be implemented in the main borehole and beat a plurality of Multilateral Wells, improve the well yield of petroleum and natural gas, reduce drilling cost.

The utility model is achieved in that at first from market or oilfield material department buys material requested and component by accompanying drawing and designing requirement; At first make inner sleeve 1, baffle ring 2, pipe lining 3, lateral liner tube 4, sealing-plug 5 by Fig. 1, the fluid sealant 7 with elastic steel sheet is made the husband of sister 6, feather key 8 and bought connects them; As Fig. 1 baffle ring 2 and inner sleeve 1, pipe lining 3 welds respectively with lateral liner tube 4, pipe lining 3 tops link to each other by the husband of sister 6 with inner sleeve 1, and the husband of sister 6 is welded to connect with inner sleeve 1, pipe lining 3 respectively, the end of each lateral liner tube 4 is provided with sealing-plug 5, and above-mentioned parts is assembled lateral liner tube Multilateral Wells completion system; Then in oil well, forge the miller tool down, mill the main borehole sleeve pipe of a segment length at certain depth, sleeve pipe 17 and setting of casing 9 descend the reaming hole instrument again in the formation, carry out the reaming hole operation forging the well section of milling, thereby reserved a hole in the down-hole, directed packer then, directed packer are mainly by directed seat envelope body 15, slips 14, sealing cup 13, fixed several feather keys 12 are formed.Certain position under the directed packer in setting of casing 9 carries out the operation of seat envelope, itself and setting of casing 9 is connected together by slips 14 , and positioning and guiding key 12, fixes on the certain orientation; Following lateral liner tube Multilateral Wells completion system, one guiding keyway is arranged in the bottom of this device, the guiding keyway snaps in the positioning and guiding key 12 during to packer top, location under this device, make its location as Fig. 3, lower center tube 16 then, it is that it extrudes lateral liner tube 4 during by this device that central tube 16 mainly contains two effects one, makes pipe lining 3 crowded being posted on the baffle ring 2; Owing to scribble fluid sealant 7 on the bushing pipe 3, pipe lining 3 passes through fluid sealant 7 sealings with baffle ring 2.The 2nd, 16 pairs of forgings of central tube are milled, the annular injection behind the reaming hole is gone into cement 10, make the lateral liner tube of all extruding all obtain solidifying, after cement 10 solidifies as can be seen from Figure 2, central tube 16 has tripped out the performance of inner sleeve 1, this device just can be paid drillng operation after above-mentioned operation was finished, and next directed wedge deflection tool of elder generation descends drilling tool to carry out drillng operation then before drilling well, bore a Multilateral Wells with regard to next time branch joint 11, had the several branch well just to repeat operation several times.

The utility model is compared with prior art: have each side well all in lateral liner tube, and pre-well cementation makes all lateral liner tubes and inner sleeve all form rigid body, adopting this device to have each Multilateral Wells is independent of each other in main borehole, be difficult for channelling between each Multilateral Wells, stability and good reliability in the sidetracking construction; Solved the well yield problem that improves petroleum and natural gas owing to beat a plurality of Multilateral Wells in a main borehole, it not only reduces drilling cost, and improves oil, gas production, remarkable in economical benefits.

Fig. 1 is a lateral liner tube Multilateral Wells completion system overall structure schematic diagram, and 1 is inner sleeve, the 2nd among the figure, baffle ring, the 3rd, bushing pipe, the 4th, lateral liner tube, the 5th, sealing-plug, the 6th, the husband of sister, the 7th, fluid sealant, the 8th, feather key.

Fig. 2 is that schematic diagram is finished in the construction of lateral liner tube Multilateral Wells completion system, and figure state 1 is an inner sleeve, the 2nd, baffle ring, the 3rd, pipe lining, the 4th, lateral liner tube, 5 sealing-plugs, the 6th, the husband of sister, the 8th, feather key, the 9th, setting of casing, the 10th, cement, the 11st, branch joint, the 17th, last sleeve pipe.

Fig. 3 is a lateral liner tube Multilateral Wells completion system construction schematic diagram, and 1 is inner sleeve, the 4th among the figure, lateral liner tube, the 8th, feather key, the 9th, setting of casing, the 10th, cement, the 12nd, positioning and guiding key, the 13rd, sealing cup, the 14th, slips, the 15th, directed seat envelope body,, the 16th, central tube, the 17th, last sleeve pipe.

Embodiment is described in conjunction with the accompanying drawings: at first by designing requirement from market or oilfield material department buy material requested and component, pressing Fig. 1 makes: make inner sleeve 1 with the sleeve in oil field material, lateral liner tube 4, make baffle ring 2 with common iron, pipe lining 3, feather key 8, make sealing-plug 5 with plastics or cast aluminium, make the husband of sister 6 with elastic steel sheet, adopt the fluid sealant of buying 7, they are connected by Fig. 1: the side opening outside that baffle ring 2 is welded on inner sleeve 1, the pipe lining 3 and the side opening of inner sleeve 1 are matched, lateral liner tube 4 is welded on the pipe lining 3 by design angle, pipe lining 3 is to link to each other by the husband of sister 6 that elastic steel sheet is made with inner sleeve 1, an end of the husband of sister 6 is welded on the upper opening portion of inner sleeve 1, and at its underpart welding feather key 8, end is welded on the upper end of pipe lining 3 in addition, the end of lateral liner tube 4 is provided with the sealing-plug 5 that can bore out, also be provided with the step of a undergauge in its end, make casing head be suspended on this step when being used for setting of casing, after extruding the pipe lining, pipe lining mouth can not be out of shape being provided with on the inner sleeve 1, pipe lining 3 outward flanges (closing part with baffle ring 2 cards) are covered with fluid sealant 7, and above-mentioned parts is assembled lateral liner tube Multilateral Wells completion system; Then in oil well, forge the miller tool down, mill the main borehole sleeve pipe of one section design length at certain depth, sleeve pipe 17 and setting of casing 9 in the formation, the well section of descending the reaming hole instrument that forging is milled is again carried out the reaming hole operation, thereby reserved a hole in the down-hole, directed packer then, directed packer mainly are made up of directed seat envelope body 15, slips 14, sealing cup 13, directed feather key 12.The operation of the capable seat envelope of certain position under the directed packer in setting of casing 9, itself and setting of casing 9 are riveted together by slips 14, and positioning and guiding key 12, fix on the certain orientation, following lateral liner tube Multilateral Wells completion system, one guiding keyway is arranged in the bottom of this device, the guiding keyway snaps in the positioning and guiding key 12 during to packer top, location under this device, make its location as Fig. 3, lower center tube 16 then, it has two effects, extrudes lateral liner tube 4 when necessarily it is by this device, pipe lining 3 is squeezed be posted on the baffle ring 2; Because pipe serves as a contrast on 3 and scribbles fluid sealant 7, pipe lining 3 seals by fluid sealant 7 with lower baffle ring 2.The 2nd, 16 pairs of forgings of central tube are milled, annular injection behind the reaming hole is gone into cement (cementing concrete) 10, make the lateral liner tube of all extruding all obtain solidifying, after cement 10 solidified as can be seen from Figure 2, central tube 16 had tripped out the performance of inner sleeve 1, after above-mentioned operation is finished, this device just can be paid drillng operation, and next directed wedge deflection tool of elder generation creeps into capable drillng operation then down before drilling well, bore a Multilateral Wells with regard to next time branch joint 11, had the several branch well just to repeat several times.

Claims (1)

1, a kind of oil drilling lateral liner tube Multilateral Wells completion system of oilfield old well development and use is characterized in that:

A, baffle ring (2) is welded on the side opening outside of inner sleeve (1), the pipe lining (3) and the side opening of inner sleeve (1) are matched, lateral liner tube (4) is welded on the pipe lining (3) by design angle, pipe lining (3) is to link to each other by the husband of sister (6) that elastic steel sheet is made with inner sleeve (1), the husband of sister's (6) a end is welded on the upper opening portion of inner sleeve (1), and at its underpart welding feather key (8), end is welded on the upper end of pipe lining (3) in addition;

B, the end of lateral liner tube (4) is provided with the sealing-plug (5) that can bore out also is provided with a undergauge in its end step;

C is provided with pipe lining window on inner sleeve (1);

D, pipe lining 3 outward flanges (with baffle ring 2 fitting parts) are covered with fluid sealant 7.

Images