Cluster well construction method

FIELD: well construction, particularly to built cluster wells.

SUBSTANCE: method involves lowering pipe string provided with deflector on end thereof in casing pipe; perforating the casing pipe within previously selected interval; performing the following alternating operations including lowering flexible pipe with nozzle in casing string into above perforation area under the action of the deflector, supplying pressurized liquid through flexible pipe with nozzle, translating thereof to form additional well bores having predetermined depths and lifting the flexible pipe after the predetermined number of well bores forming, finally removing the flexible pipe from the casing pipe. Before casing pipe lowering casing pipe is provided with retained guide. The guide includes process case with through orifices and bush. Formed on inner surface of process case are guiding slots and cylindrical recess located in through orifice area. The bush is inserted in the recess to seal through orifices. The bush is restricted from axial downward displacement by rest. During the lowering operation performing through orifices are arranged within above perforation interval and casing pipe is secured, deflector provided with a number of guiding channels and spring-loaded inserts displaces the bush up to the rest and the spring-loaded inserts cooperate with guiding slots to bring outlet orifices of guiding channels in register with through orifices. To obtain demanded number of well bores flexible pipe with nozzle is removed only from pipe string and deflector after each additional well bore creation.

EFFECT: reduced number of trip operations during well construction.

4 dwg, 1 ex

 

The invention relates to the oil and gas industry, namely for the construction of the bushes oil and gas wells.

A known Method of construction multilateral wells" (A.S. No. 1798466, MKI E 21 In 7/06, publ. BI No. 8, 28.02.93, including the drilling of the vertical main trunk, installation and mounting in the trunk of the drum located in its plane by guide columns and deflecting the node at the bottom, alternate drilling, drilling and fastening additional trunks, when drilling the bottom portion of the main stem increases in diameter, the drum is placed directly above the bottom section of the base of the trunk, and the drilling of additional trunks perform well through the wall of the latter.

The disadvantages of this method are:

first, the necessity of drilling the main stem of large diameter, which requires a large investment of time, especially in deep wells, and, as a consequence, huge costs;

secondly, the guide columns also increases the cost of construction multilateral wells;

thirdly, such an arrangement is well complicated for both construction and operation.

The closest in technical essence and the achieved result is "Method and device for gorizontalnom the drilling of wells" (US patent No. 5413184, IPC E 21 In 7/08, publ. 09.05.1995, including the descent into the casing at a predetermined depth of the column of pipes at the end of which is the whipstock, the descent into the string of pipe flexible shaft with a cutter on the end to interact with the whipstock, rotation and translational movement of the flexible shaft with the cutter, which as a result of interaction with diverter opens the casing and enters the reservoir at a specified distance obtaining process of the channel, removing the flexible shaft with the cutter from the well, the descent into the string of pipe flexible pipe with nozzle to the entrance, under the action of the diverter, in the area of the opening of the casing, the supply of fluid under pressure through flexible pipe with nozzle with simultaneous translational movement to increase the technological channel to the required length.

The disadvantages of this method are the necessity in the construction of multilateral wells perform consistently operations: rotate to the desired angle of the column of pipes, descent flexible shaft with a cutter, cutting the channel, the deepening of the channel by means of a flexible pipe with nozzle under the action of pressure fluid, and so for each additional horizontal stem that leads to great loss of time and, consequently, the material cost (see instructions RadTech International Inc. for the construction of wells (US No. 5413184), including multilateral).

The technical object of the present invention is the reduction of material and financial costs by reducing the number of trip-UPS of equipment and exceptions rotate the tubing in the construction of multilateral wells using for sinking flexible pipe with nozzle under the action of pressure fluid, the opening of the casing in the radial direction depending on the required number of additional shafts without disturbing its integrity.

The technical problem is solved by the method of construction multilateral wells, including the descent into the casing pipe string at the end of which is the whipstock, the opening of the casing in the desired interval, alternating descent into the string of pipe flexible pipe with nozzle to the entrance, under the action of the diverter, in the area of the opening of the casing, the flow of liquid under pressure through a flexible pipe with nozzle simultaneous translational movement for forming additional trunks to the desired length by removing the flexible pipe to the required number of additional barrels, after which a flexible tube with nozzle completely removed from the casing string.

What's new is that the casing is additionally before descending equip rigidly fixed guide containing the processing building with Squaw is different holes and sleeve, on the inner surface of the process building made directing grooves and cylindrical sample in the area of the through holes, into which is inserted the sleeve, tightly overlapping through holes and limited emphasis from axial movement down, and during descent through holes set in the desired range of opening with the subsequent fastening of the casing, during the downward movement of the whipstock, provided with several guide channels and a spring-loaded inserts, moves down the sleeve until it stops, and springloaded inserts cooperate with the guide slots, setting the output openings of the guide channels opposite the through holes, while the flexible column with the nozzle, after the formation of each additional trunk derive only from the whipstock to obtain the required number of additional trunks.

Figure 1 shows the layout of the casing prior to forming additional trunks.

Figure 2 shows a section a-a technological building with the guide slots.

Figure 3 shows the cut-In standoff with the guide channels and a spring-loaded slots.

Figure 4 shows the diagram of the formation of additional trunk.

Specific example

The method of construction multilateral wells for implementation through the SJ as follows.

The casing 1 before descending into the well equipped gestational guide 2 containing technological casing 3 with the through holes 4 and the sleeve 5. On the inner surface of the process building 3 made the guide grooves 6 (see Figure 2) and a cylindrical sample 7 in the area of the through-hole 4 into which is inserted the sleeve 5, tightly overlapping the through-hole 2 and is limited by the stop 8 against axial movement down, additionally, the sleeve 5 is connected with the technological casing 3 by means of the shear element 9.

During descent through hole 4 is installed in the desired interval of the opening opposite the productive formation 10. Next, produce the cementing of the casing 1 by any of the existing technologies (not shown). After waiting for the solidification of the cement in the casing 1 produce the descent of the column pipe 11 with the diverter 12. The whipstock 12 inside provided with several guide channels 13, the outside spring-loaded inserts 14 (see figure 3).

As an example, consider the whipstock 12 having two guide channel 13' and 13".

The whipstock 12 descends to until spring insert 14, once in a cylindrical sample 7, sitteth not down to its lower end to the upper end of the guide 2 of the casing 1, which is reflected by the appearance of the weight of the pipe string 11 in which icecore weight, located at the wellhead (not shown). Then do a slow rotation of the pipe string 11 in any direction up until the spring insert 14 whipstock 12 will go into the guide grooves 6 on the inner surface of the process building 3. As a result, the whipstock 12 receives a fixed radial direction and along the guide grooves 6 goes down. Next, produce a discharge column pipe 11 with the whipstock 12 on the sleeve 5 (Figure 4), and the load is fixed by the weight indicator (not shown), at a certain point, the corresponding design load, shear element 9 is destroyed, and the sleeve 5 goes down and sits on the stop 8 of the casing 1, while the whipstock 12 also goes down and sits on the upper end of the sleeve 5, by setting the output openings of the guide channels 13 of the whipstock 12 opposite the through holes 4 of the process building 3.

Later in the column pipe 11 lower flexible tube 15 with the nozzle 16 to input them via conduit 13' of the whipstock 12 in the interval of opening of the casing 1 opposite the productive formation 10 which is fixed on the mouth on the weight indicator and then at the wellhead put a label (not shown) on the flexible tube 15 to the beginning of the formation of the additional shaft 17. Next serves fluid under pressure through a flexible pipe 15 with the nozzle 16 with ignoreme the major translational motion, as a result, the interval of the opening 3 is formed an additional barrel 17, which is increased to the required length L. then the flexible tube 15 with the nozzle 16 is extracted from the additional shaft 17 of the casing 1 and the whipstock 6 pipe string 11 to the above tags plus the length of the guide channel 13'. Then a flexible pipe 15 with the nozzle 16 is slid in the second guide channel 13" standoff 12 is determined by the lower weight of the flexible tube 15 (the weight indicator) when it is lowered to the label on the mouth. Then form a new secondary shaft 17'. Then again under the action of the pressure fluid supplied through a flexible pipe 15 with the nozzle 16, to form a second additional shaft 17' of the desired length L in a given interval.

In cases where the label of the flexible tube 15 is lowered to the mouth significantly lower without changing the weight, remove the flexible pipe 15 to the mark plus the length of the guide channel 13', after which the flexible tube 15 is turned at a small angle to the natural residual curvature changed its orientation, and again attempt to until the flexible tube 15 will not stop at the label that will be fixed by the weight indicator. Almost getting to the next conduit 13" flexible pipe is provided for 1-3 attempts with four guide channels 13 in the whipstock 6.

In the above example, we not considered the option of building multilateral wells with two additional trunks 17, similarly work for the required number of additional shafts 17, but this requires the use of a whipstock 12 with the number of guide channels 13, and accordingly, the through holes 4 of the process building 3, equal to the number of additional shafts 17.

The use of the proposed method due to the opening of the casing in the radial direction depending on the required number of additional trunks does not violate its integrity and reduces the number of trip-UPS of equipment, and the presence of the whipstock with multiple bending channels allows to exclude the operation of rotating the pipe string, which together can reduce material and financial costs for the construction of multilateral wells using for sinking flexible tube with a nozzle under the action of pressure fluid.

The method of construction multilateral wells, including the descent into the casing pipe string at the end of which is the whipstock, the opening of the casing in the desired interval, alternating descent into the string of pipe flexible pipe with nozzle to the entrance under the action of the diverter in the area of the opening of the casing, the flow of liquid under pressure through a flexible pipe with nozzle simultaneous translational movement for the formation to olitely trunks to the desired length by removing the flexible pipe to the required number of additional shafts, then a flexible pipe with nozzle completely removed from the casing, wherein the casing is additionally before descending equip rigidly fixed guide containing the processing building with the hole and the sleeve, with the inner surface of the process building made directing grooves and cylindrical sample in the area of the through holes, into which is inserted the sleeve, tightly overlapping through holes and limited emphasis from axial movement down, and during descent through holes set in the desired range of opening with the subsequent fastening of the casing, during the downward movement of the whipstock, provided with several guide channels and a spring-loaded inserts, slips down the sleeve until it stops, and springloaded inserts cooperate with the guide slots, setting the output openings of the guide channels opposite the through holes, while the flexible column with nozzle after the formation of each additional trunk only extracts from the pipe string and whipstock to obtain the required number of additional trunks.



 

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FIELD: well construction, particularly to built cluster wells.

SUBSTANCE: method involves lowering pipe string provided with deflector on end thereof in casing pipe; perforating the casing pipe within previously selected interval; performing the following alternating operations including lowering flexible pipe with nozzle in casing string into above perforation area under the action of the deflector, supplying pressurized liquid through flexible pipe with nozzle, translating thereof to form additional well bores having predetermined depths and lifting the flexible pipe after the predetermined number of well bores forming, finally removing the flexible pipe from the casing pipe. Before casing pipe lowering casing pipe is provided with retained guide. The guide includes process case with through orifices and bush. Formed on inner surface of process case are guiding slots and cylindrical recess located in through orifice area. The bush is inserted in the recess to seal through orifices. The bush is restricted from axial downward displacement by rest. During the lowering operation performing through orifices are arranged within above perforation interval and casing pipe is secured, deflector provided with a number of guiding channels and spring-loaded inserts displaces the bush up to the rest and the spring-loaded inserts cooperate with guiding slots to bring outlet orifices of guiding channels in register with through orifices. To obtain demanded number of well bores flexible pipe with nozzle is removed only from pipe string and deflector after each additional well bore creation.

EFFECT: reduced number of trip operations during well construction.

4 dwg, 1 ex

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EFFECT: reduced number of trips.

2 dwg

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