Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of unlimited pole sliding sleeve and process, for acidification of oil gas well pressure break provides a kind of effective, the aid of unlimited classification can be carried out, the present invention is completely different from traditional existing stage division, not only can infinitely classification, the consistent of tool bore at different levels can also be kept, why can accomplish that unlimited classification is consistent with internal diameter at different levels, because be not adopt the existing method from radial grading, but adopt the brand-new thinking of starting with to axis, limited internal diameter is used to greatest extent, thus reduce liquid stream frictional resistance and the erosion to instrument, play the ability of acid fracturing equipment, promote the scale of acid fracturing.
A process for unlimited pole sliding sleeve, containing following steps;
First should clearly construct the process number of plies of well, on number of plies basis, then subtract 1 is exactly the process number of plies needing to prepare, and confirm H, L correspondingly-sized at different levels and order, pipe aperture is greater than displacement sliding sleeve internal diameter, and the straight step that do not have;
Between two packers, access the present invention and anchoring device near the position of lower packet successively, with oil pipe by pipe string G.I.H, install set packer after production tree, then enter acid fracturing program;
When needing the oil pipe passage opening one deck, the sealing position moving mechanism comprising ball sealer is dropped into from oil pipe, low discharge capacity puts in place after being pumped across above sliding sleeve at different levels, distinguish boss on claw type displacement ball seat is embedded in displacement sliding sleeve cannelure, v-ring seals up displacement sliding sleeve, now oil pipe do not have fluid course, the result that pump works on is exactly that hydraulic pressure raises, and change downward Axial Loads on sliding sleeve shear pin at this, the shear force shear pin that the axial load produced when hydraulic pressure reaches sliding sleeve shear pin is cut off, sealing position moving mechanism drives displacement sliding sleeve simultaneously descending, open acidifying pressure channel, radially launch under elastic force effect when bound lock ring boss arrives intrinsic groove to embed groove, sealing position moving mechanism except ball sealer is locked in current location, because every mouthful of well has several intervals, acid fracturing is complete when carrying out the row of returning or producing, the ball sealer of every layer all likely by liquid stream with up, the outside dimension of conventional seals ball is greater than claw type displacement ball seat internal diameter, locking mechanism has been had just to be unlikely to make ball sealer to head on sealing position moving mechanism up and close production fluid passage, and sealing position moving mechanism lower end is designed with the claw-like structures that protracts, also there are enough equivalent aeras can by liquid stream even if ball sealer moves to this.
During fracture acidizing process, low discharge capacity pumping, when the boss of L length arrives the H size groove of corresponding level, due to now L < H, under point claw elastic force effect, L is embedded into H, whole sealing position moving mechanism has just hung on displacement sliding sleeve, displacement sliding sleeve endoporus seals by v-ring, continue pumps hydraulic and change downward Axial Loads on sliding sleeve shear pin at this, the shear force shear pin that the axial load produced when hydraulic pressure reaches sliding sleeve shear pin is cut off, sealing position moving mechanism drives displacement sliding sleeve simultaneously descending, open acidifying pressure channel, radially launch under elastic force effect when bound lock ring boss arrives intrinsic groove to embed groove, sealing position moving mechanism except ball sealer is locked in current location.
A kind of unlimited pole sliding sleeve, by box cupling 1, body 2, displacement sliding sleeve 3, first O-ring seals 4, sliding sleeve shear pin 5, lock ring 6, the second O-ring seals 7, hold-down screw 8, lower contact 9, claw type displacement ball seat 10, ball sealer 11, v-ring 12, spacer ring 13, composition such as fixed guide fixed ring 14 grade;
State when entering well is that box cupling connects body 21 time, and have displacement sliding sleeve 3 in body 2, body 2 lower end connects lower contact 9;
Body 2 has three slotted holes, in body 2, there are some discontinuous cannelures in portion on the lower;
Displacement sliding sleeve 3 is housed when entering well in body 2, the outside two ends up and down of displacement sliding sleeve 3 have the first O-ring seals 4, second O-ring seals 7 respectively, displacement sliding sleeve 3 bottom second O-ring seals has discontinuous cannelure 7 times, displacement sliding sleeve 3 and body 2 are fixed by sliding sleeve shear pin 5, and displacement sliding sleeve 3 internal diameter bottom has grooving instrument easy to use along the circumferential direction to rotate it;
There is the cannelure for classification in the top portion of displacement sliding sleeve 3 internal diameter, only changes the axial length of cannelure and do not change other size during classification;
Body 2 and lower contact 9 are by being threaded, and the second O-ring seals 7 seals, and connect body 2 and lower contact 9 anti-rotation by hold-down screw 8, lock ring 6 is arranged between body 2 and displacement sliding sleeve 3.；
The sealing position moving device of ball sealer 11, claw type displacement ball seat 10, v-ring 12, spacer ring 13 and fixed guide fixed ring 14 composition.
Annular groove length one_to_one corresponding in the length and displacement sliding sleeve 3 of the sealing position moving device upper shed claw type outer lug boss of oil pipe input, only has the boss when land length is less than groove length just can be embedded in groove;
The equivalent aera that the sealing position moving device above liquid stream that oil pipe inherence is dropped into passes through is identical.
Opening is installed in the discontinuous cannelure in displacement sliding sleeve 3 bottom, the elastic lock ring that external diameter local is protruded, during installation, this lock ring 6 is extruded by body 2 internal diameter, the discontinuous groove that local projection is avoided on body 2 can load, after projection and discontinuous groove being gone to same axis after crossing discontinuous groove, shear pin is fixed, during work, sliding sleeve shear pin 5 is cut off displacement sliding sleeve when coming downwards to discontinuous groove with lock ring, lock ring opens by elastic force, boss is embedded into discontinuous groove, input part is all lockable except ball sealer, avoid because output liquid flow impact closes liquid outlet channel by input part pushes away.
Advantage of the present invention make use of the limited internal diameter of oil pipe to large extent; Sliding sleeve internal diameter at different levels is consistent; Reduce liquid stream frictional resistance; Be conducive to improving acid fracturing scale; Reduce the erosion to instrument oil well pipe, be conducive to reliability and the construction safety of raising instrument.
Present invention also offers a kind of unlimited pole sliding sleeve, comprise body, unlimited pole sliding sleeve also comprises: displacement sliding sleeve, and displacement sliding sleeve is arranged in body, and the inwall of displacement sliding sleeve is provided with cannelure; Sealing position moving device, sealing position moving device drops in displacement sliding sleeve, and the arranged outside of sealing position moving device has boss; Wherein, sealing position moving device is descending in displacement sliding sleeve, and when sealing position moving device moves to its boss position relative with cannelure, if the height of boss is greater than the height of the cannelure on displacement sliding sleeve, sealing position moving device continues descending in displacement sliding sleeve; If the height of the boss of sealing position moving device is less than the height of the cannelure of displacement sliding sleeve, boss embeds in cannelure to make sealing position moving device hang on displacement sliding sleeve.
Further, displacement sliding sleeve is provided with multiple cannelure, multiple cannelure is axial arranged along displacement sliding sleeve; When sealing position moving device moves down into its boss position relative with a cannelure of displacement sliding sleeve, and when the height of boss is less than the height of cannelure on the other side, boss embeds in cannelure.
Further, sealing position moving device is provided with multiple boss, and multiple boss and multiple cannelure are arranged correspondingly.
Further, unlimited pole sliding sleeve also comprises sliding sleeve shear pin, and displacement sliding sleeve is fixed on body by sliding sleeve shear pin.
Further, the outer wall of displacement sliding sleeve is provided with mounting groove, in mounting groove, lock ring is installed, and the inwall of body is provided with lock slots; When displacement sliding sleeve is fixed on body by sliding sleeve shear pin, lock ring is connected on the inwall of body; After displacement shear pin is cut off, displacement sliding sleeve moves down with lock ring until one end away from displacement sliding sleeve of lock ring embeds in lock slots to make displacement sliding sleeve be fixed on body.
Detailed description of the invention
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, by box cupling 1, body 2, displacement sliding sleeve 3, first O-ring seals 4, sliding sleeve shear pin 5, lock ring 6, the second O-ring seals 7, hold-down screw 8, lower contact 9, claw type displacement ball seat 10, ball sealer 11, v-ring 12, spacer ring 13, composition such as fixed guide fixed ring 14 grade.
Fig. 1 is the state of the present invention when entering well, and Fig. 2 is the state of the present invention when dropping into by 10 ~ 14 sealing position moving mechanisms formed and open sliding sleeve when working.
Unlimited classification is achieved in that as shown in Figure 1, state when the present invention enters well is that box cupling connects body 21 time, body 2 has three symmetrical slotted holes, body 2 internal diameter bottom is processed with symmetrical grooves, slotted hole seals built with the displacement sliding sleeve 3 of band sealing ring by body 2, and in displacement sliding sleeve 3, upper end is processed with the cannelure that length is H, and lower end external diameter is processed with discontinuous cannelure, groove is built with opening boss lock ring, and displacement sliding sleeve 3 and body 2 are fixed by sliding sleeve shear pin 5.Body 2 lower end connects the lower contact 9 that the second O-ring seals 7 is housed, and box cupling 1 and lower contact 9 are tubing round thread.
Lock ring 6 has bidirectional locking function, should rotate an angle during installation in position shown in Fig. 1 displacement sliding sleeve 3, makes the groove that the boss of lock ring 6 is avoided on body 2, rotates displacement sliding sleeve 3 to position shown in Fig. 1 after groove crossed by boss again.
As shown in Figure 2, during fracture acidizing process, drop into the sealing position moving mechanism formed by 10 ~ 14 from bottom to top, and low discharge capacity pumping, when the boss of L length arrives the H size groove of corresponding level, due to now L < H (see Fig. 5), under point claw elastic force effect, L is embedded into H, whole sealing position moving mechanism has just hung on displacement sliding sleeve 3, displacement sliding sleeve 3 endoporus seals by v-ring, continue pumps hydraulic and change downward Axial Loads on sliding sleeve shear pin at this, the shear force shear pin that the axial load produced when hydraulic pressure reaches sliding sleeve shear pin 5 is cut off, sealing position moving mechanism drives displacement sliding sleeve 3 simultaneously descending, open acid fracturing passage, radially launch under elastic force effect when bound lock ring boss arrives intrinsic groove to embed groove, sealing position moving mechanism except ball sealer is locked in current location.
The present invention is when realizing unlimited classification, and the internal diameter of fluid course is consistent, not to sacrifice internal diameter for cost.Realize infinite stages like this: as L > H (see Fig. 6), sealing position moving mechanism would not be continued descending by tangling, until L < H claw type displacement ball seat just can to displacement sliding sleeve generation effect, principle according to this, if H at the corresponding levels is designed to 15 by us, L is designed to 10, and increase progressively with 5mm, be 110, L to 20 grades of H be 105.See with external staged fracturing segmentation progression, general 0.125in (3.175mm) is one-level, minimum diameter 1.25in (31.75mm), according to be 27/8in × 5.5mm specification oil pipe, maximumly can only be discharged to 52.5mm (ball 0.25in and 6.35mm larger than ball seat) that is, by so arrangement, 6.5 grades can only be discharged in 27/8in × 5.5mm specification oil pipe, maximum 7 grades, the present invention is not then by the impact of pipe aperture.
Embodiment 2: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, a kind of infinite stages sliding sleeve, by box cupling 1, body 2, displacement sliding sleeve 3, first O-ring seals 4, sliding sleeve shear pin 5, lock ring 6, the second O-ring seals 7, hold-down screw 8, lower contact 9, claw type displacement ball seat 10, ball sealer 11, v-ring 12, spacer ring 13, composition such as fixed guide fixed ring 14 grade.
State when entering well is that box cupling connects body 21 time, and have displacement sliding sleeve 3 in body 2, body 2 lower end connects lower contact 9.
Body 2 has three slotted holes, in body 2, there are some discontinuous cannelures in portion on the lower.
Displacement sliding sleeve 3 is housed when entering well in body 2, the outside two ends up and down of displacement sliding sleeve 3 have the first O-ring seals 4, second O-ring seals 7 respectively, displacement sliding sleeve 3 bottom second O-ring seals has discontinuous cannelure 7 times, displacement sliding sleeve 3 and body 2 are fixed by sliding sleeve shear pin 5, and displacement sliding sleeve 3 internal diameter lower end has grooving instrument easy to use along the circumferential direction to rotate it.
There is the cannelure for classification in the top portion of displacement sliding sleeve 3 internal diameter, only changes the axial length of cannelure and do not change other size during classification.
Body 2 and lower contact 9, by being threaded, are sealed by the second O-ring seals 7, connect body 2 and lower contact 9 anti-rotation by hold-down screw 8.
Need during work to drop into from oil pipe the sealing position moving device be made up of ball sealer 11, claw type displacement ball seat 10, v-ring 12, spacer ring 13 and fixed guide fixed ring 14 etc.
Annular groove length one_to_one corresponding in the length and displacement sliding sleeve 3 of the sealing position moving device upper shed claw type displacement outer lug boss of oil pipe input, only has the boss when land length is less than groove length just can be embedded in groove.
The equivalent aera that oil pipe passes through at input sealing position moving device above liquid stream is identical.
Opening is installed in the discontinuous cannelure in displacement sliding sleeve 3 bottom, the elastic lock ring that external diameter local is protruded, during installation, this lock ring 6 is extruded by body 2 internal diameter, the discontinuous groove that local projection is avoided on body 2 can load, after projection and discontinuous groove being gone to same axis after crossing discontinuous groove, shear pin is fixed, during work, sliding sleeve shear pin 5 is cut off rear displacement slide strips and lock ring when coming downwards to discontinuous groove, lock ring opens by elastic force, boss is embedded into discontinuous groove, input part is all lockable except ball sealer, avoid because output liquid flow impact pushes away closedown liquid outlet channel by input part.
Enough from the claw type displacement land length the sealing position moving device that oil pipe drops into during work, when by being not displacement sliding sleeve cannelure supporting with it, bottom guiding mechanism has entered into lower contact internal diameter and the boss of upper jaw morpheme moving device is also positioned at displacement sliding sleeve, to ensure also can normally use in horizontal well.
Sealing position moving mechanism lower end is designed with the claw-like structures that protracts, and also has enough equivalent aeras by liquid stream, can not block liquid outlet channel at this even if ball sealer moves to this.
Embodiment 3: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6,
A kind of unlimited pole sliding sleeve, itself can be implemented in same well and is divided into unlimited pole, every grade of sliding sleeve interior through being consistent, and can reduce the frictional resistance of liquid stream to a great extent, be conducive to strengthening treatment scale.
Below the further optimization/to technical solution of the present invention and improvement:
On above-mentioned body 2, symmetry has three elongated slots, and its equivalent aera is much larger than pipe aperture area, and during to reduce pressure break, load fluid is to the erosion degree of sleeve pipe and body;
Above-mentioned displacement sliding sleeve is installed in body, and is fixed by shear pin; Therebetween lock ring is installed;
Above-mentioned claw type displacement ball seat arrives displacement sliding sleeve time-division claw boss corresponding with it and is embedded into displacement sliding sleeve cannelure, shear pin is cut off under hydraulic action, drive displacement sliding sleeve is together descending opens the fluid course corresponding with this layer, and Bottom Runby considers the backwash erosion of fluid;
Be processed with the cannelure of different length in above-mentioned displacement sliding sleeve upper end according to the difference of rank, the cannelure length in displacement sliding sleeve and claw type displacement divide claw land length one_to_one corresponding, and all subordinates claw type displacement sliding sleeve is all by other displacement sliding sleeve of its higher level;
The length of above-mentioned claw type displacement sliding sleeve takes into full account its applicability in horizontal well, when not being the displacement sliding sleeve by self correspondence, lower end targeting part is when entering into lower contact internal diameter, and upper end still has partial-length to be positioned at displacement sliding sleeve, passes through smoothly after guaranteeing centering;
Above-mentioned unlimited pole other minimum diameter of sliding sleeve arbitrary number of level is measure-alike.
Embodiment 4: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, this unlimited pole sliding sleeve by box cupling 1, body 2, displacement sliding sleeve 3, first O-ring seals 4, sliding sleeve shear pin 5, lock ring 6, the second O-ring seals 7, hold-down screw 8, lower contact 9, claw type displacement ball seat 10, ball sealer 11, v-ring 12, spacer ring 13, composition such as fixed guide fixed ring 14 grade.
As shown in Figure 1, state when the present invention enters well is connect body under box cupling, body has three symmetrical slotted holes, body internal diameter bottom is processed with symmetrical grooves, body is built with being with the displacement sliding sleeve of sealing ring by external seal in slotted hole, and in displacement sliding sleeve, upper end is processed with the cannelure that length is H, and lower end external diameter is processed with discontinuous cannelure, groove is built with opening boss lock ring, and displacement sliding sleeve and body are fixed by shear pin.Body lower end connects the lower contact that sealing ring is housed, and box cupling and lower contact are tubing round thread.Lock ring has bidirectional locking function, should rotate an angle during installation in position shown in Fig. 1 displacement sliding sleeve, makes the groove that the boss of lock ring is avoided on body, rotates displacement sliding sleeve to position shown in Fig. 1 after groove crossed by boss again.
As shown in Figure 2, during fracture acidizing process, drop into the sealing position moving mechanism formed by 10 ~ 14 from bottom to top, and low discharge capacity pumping, when the boss of L length arrives the H size groove of corresponding level, due to now L < H, under point claw elastic force effect, L is embedded into H, whole sealing position moving mechanism has just hung on displacement sliding sleeve, displacement sliding sleeve endoporus seals by v-ring, continue pumps hydraulic and change downward Axial Loads on sliding sleeve shear pin at this, the shear force shear pin that the axial load produced when hydraulic pressure reaches sliding sleeve shear pin is cut off, sealing position moving mechanism drives displacement sliding sleeve simultaneously descending, open acid fracturing passage, radially launch under elastic force effect when bound lock ring boss arrives intrinsic groove to embed groove, sealing position moving mechanism except ball sealer is locked in current location.
The present invention is when realizing unlimited classification, and the internal diameter of fluid course is consistent, not to sacrifice internal diameter for cost.Realize infinite stages like this: as L > H (see Fig. 6), sealing position moving mechanism would not be continued descending by tangling, until L < H (see Fig. 5) claw type displacement ball seat just can to displacement sliding sleeve generation effect, principle according to this, if H at the corresponding levels is designed to 15 by us, L is designed to 10, and increase progressively with 5mm, be 110, L to 20 grades of H be 105.
See with external staged fracturing segmentation progression, general 0.125in (3.175mm) is one-level, minimum diameter 1.25in (31.75mm), according to be 27/8in × 5.5mm specification oil pipe, maximumly can only be discharged to 52.5mm (ball 0.25in and 6.35mm larger than ball seat) that is, by so arrangement, 6.5 grades can only be discharged in 27/8in × 5.5mm specification oil pipe, maximum 7 grades, the present invention is not then by the impact of pipe aperture.
In order to the acid fracturing operation of completion system, also must use with tool combinations such as supporting oil, gas well packers.Generally between two packers, the present invention is installed.
Above technical characteristic constitutes most preferred embodiment of the present invention, and it has stronger compliance and best implementation result, can increase and decrease its technical characteristic according to actual needs, with satisfied different demand.
The course of work of the present invention is as follows: before use the present invention, first should clearly to construct the process number of plies of well, then subtract on number of plies basis 1 be exactly need to prepare quantity of the present invention (according to the difference of packer setting mode also can the present invention identical with processing the number of plies), confirm H, L correspondingly-sized at different levels and order, pipe aperture is greater than displacement sliding sleeve internal diameter, and the straight step that do not have.Between two packers, access the present invention and anchoring device near the position of lower packet successively, with oil pipe by pipe string G.I.H, install set packer after production tree, then enter acid fracturing program.When needing the oil pipe passage opening one deck, the sealing position moving mechanism comprising ball sealer is dropped into from oil pipe, low discharge capacity puts in place after being pumped across above sliding sleeve at different levels, distinguish boss on claw type displacement ball seat is embedded in displacement sliding sleeve cannelure, v-ring seals up displacement sliding sleeve, now oil pipe do not have fluid course, the result that pump works on is exactly that hydraulic pressure raises, and change downward Axial Loads on sliding sleeve shear pin at this, the shear force shear pin that the axial load produced when hydraulic pressure reaches sliding sleeve shear pin is cut off, sealing position moving mechanism drives displacement sliding sleeve simultaneously descending, open acid fracturing passage, radially launch under elastic force effect when bound lock ring boss arrives intrinsic groove to embed groove, sealing position moving mechanism except ball sealer is locked in current location, because every mouthful of well has several intervals, acid fracturing is complete when carrying out the row of returning or producing, the ball sealer of every layer all likely by liquid stream with up, the outside dimension of conventional seals ball is greater than claw type displacement ball seat internal diameter, locking mechanism has been had just to be unlikely to make ball sealer to head on sealing position moving mechanism up and close production fluid passage, and sealing position moving mechanism lower end is designed with the claw-like structures that protracts, also there are enough equivalent aeras can by liquid stream even if ball sealer moves to this.To be more perfect according to solvable ball sealer technology.
Drop into sealing position moving mechanism successively from bottom to top, by the row of returning, operation after above method successively acid fracturing.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.