CN115110941A - Sand blower for multi-layer fracturing - Google Patents
Sand blower for multi-layer fracturing Download PDFInfo
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- CN115110941A CN115110941A CN202210718592.5A CN202210718592A CN115110941A CN 115110941 A CN115110941 A CN 115110941A CN 202210718592 A CN202210718592 A CN 202210718592A CN 115110941 A CN115110941 A CN 115110941A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a sand blaster for multilayer fracturing, which is provided with a pitching locking structure and a supporting liquid output device, wherein the pitching locking structure is positioned at the end part of an inner sliding sleeve of the sand blaster; by using the detection mechanism, the underground pressure detection device and the pitching contact state detection device are included, the central control unit is also arranged for controlling each detector in the detection mechanism to detect the corresponding underground pressure value, the contact state of the pitching and the sliding sleeve and the pressure received by the pitching, the underground condition can be preliminarily judged according to the detection result of the detection mechanism, each pressure value is compared with the preset pressure value, the pressure value at the bottom of the well is input according to the detection result aiming at the preset pressure value, and the standing time is adjusted; the problem of inconvenience in underground detection is effectively solved, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
Description
Technical Field
The invention relates to the technical field of oil field fracturing, in particular to a sand blaster for multilayer fracturing.
Background
The separate-layer fracturing construction is a new process developed on the basis of common fracturing construction, and has the characteristics of high construction efficiency and high economic benefit. The separate layer fracturing construction is supplemented by a large number of new tool research and development, and the experience of the process technology is accumulated, and the separate layer fracturing construction tends to a high-speed development period technically. When oil field development is carried out, stratum with low permeability is fractured, the connectivity of the stratum is increased, and the yield is improved. The existing tool generally fractures one layer, if a plurality of layers are fractured, some special methods and steps are needed, the fracturing procedures of the layers are more, the construction is complex, the construction time is long, the underground pressure condition cannot be detected underground, and the underground condition cannot be checked.
The fracturing technology is used in oil and gas exploitation, the flowing environment of oil underground can be improved, the oil well yield is increased, the sand blaster for multi-layer fracturing is used, the single well yield is improved, the labor cost and the time cost are saved, multi-layer staged fracturing is realized, the construction procedures are reduced, the construction is simplified, and the construction time is shortened.
Disclosure of Invention
Therefore, the invention provides a sand blaster for multi-layer fracturing, which is used for overcoming the problem that the underground pressure cannot be detected in real time in the prior art.
The sand blaster main body is used for forming cracks on an oil-gas layer in an oil well under the action of water power and comprises an upper joint, a central pipe connected with the output end of the upper joint, a lower joint connected with the output end of the central pipe and a sliding sleeve arranged inside the central pipe, wherein a sand outlet is formed in the side wall of the central pipe, and part of the sliding sleeve is positioned inside the central pipe and used for sealing the sand outlet; the sand blaster also comprises a shot used for sequentially passing through the upper joint and the interior of the central pipe to push the sliding sleeve to a corresponding position when the sand blaster operates;
the shot locking structure is positioned at the end part of the sliding sleeve in the sand blaster, the top end of the locking structure is provided with a spring claw, and the spring claw is provided with a clamping structure used for locking a shot when the shot reaches the end part of the sliding sleeve;
a supporting liquid output device which is positioned at the side of the inner wall of the sand blasting opening and is used for outputting the supporting liquid from the inner part of the sand blasting opening to the outside;
further, the sand blaster, its outside is equipped with the control system who links to each other with the sand blaster, includes:
the detection unit comprises a plurality of underground pressure detectors which are positioned at corresponding positions of the outer wall of the sand blaster to detect the pressure of the corresponding underground positions in real time, a plurality of pitching contact state detectors which are respectively positioned on the end faces of the sliding sleeves close to one sides of the upper joints to detect the contact states of pitching and the sliding sleeves, and an external pressurizing device pressure detector which is positioned outside a well and used for inputting the pressure underground;
and the central control unit is respectively connected with each underground pressure detector and each ball throwing pressure detector and is used for determining a preset pressure value in the oil well according to the depth of the oil well, selecting a corresponding processing mode according to the actually measured pressure value when the underground pressure is judged not to meet the preset standard, and judging whether parameters in the corresponding processing mode are subjected to targeted adjustment or not according to the difference value between the actually measured pressure value and the preset standard when the processing mode is selected.
Furthermore, the central control unit is provided with a first preset oil well depth H1, a second preset oil well depth H2, a first preset underground pressure regulating coefficient e1, a second preset underground pressure regulating coefficient e2, a first preset underground pressure P1 and a second preset underground pressure P2, wherein H1 is more than H2, 1 is more than e1 and more than e2, and P1 is more than P2; before the sand blaster is used, the central control unit judges whether the preset well descending pressure at the corresponding position is adjusted to the corresponding value when the sand blaster is put down the well according to the depth of the oil well,
if H is less than or equal to H1, the central control unit judges that no adjustment is needed to P1 or P2;
if H1 < H ≦ H2, the central control unit decides to adjust P1 and P2 to the corresponding values using e 1;
if H > H2, the central control unit decides to adjust P1 and P2 to the corresponding values using e 2;
when the central control unit uses ei to adjust P1 and P2, setting i to be 1 and 2, recording the adjusted preset pressure values as P1 'and P2', setting P1 to be P1 × ei, and setting P2 to be P2 × ei; and the central control unit adjusts the preset pressure to a corresponding value, and compares the detected underground pressure value with the preset underground pressure value in the central control unit.
Further, a first preset downhole pressure P1 'and a second preset downhole pressure P2' are arranged in the central control unit; when the underground pressure detector detects the underground pressure in real time, the detected underground pressure value is compared with the preset underground pressure value in the central control unit, the actual pressure of the corresponding position detected by the underground pressure detector in the working process is recorded as P,
if P is less than or equal to P1', the central control unit preliminarily judges that the pressure of the well external pressure device is insufficient, calculates the difference value between P and P1, and adjusts the output pressure to a corresponding value according to delta Pa and delta Pa;
if P is more than P1 '< P is less than or equal to P2', the central control unit judges that the underground pressure meets the preset value;
if P is more than P2', the central control unit preliminarily judges that the sand blasting hole is blocked, and the central control unit controls the ball throwing contact state detector to detect the contact state of the ball throwing and the sliding sleeve.
Furthermore, a first preset underground pressure difference value delta Pa1, a second preset underground pressure difference value delta Pa2, a first preset pressure adjusting coefficient alpha 1, a second preset pressure adjusting coefficient alpha 2 and a third preset pressure adjusting coefficient alpha 3 are arranged in the central control unit, wherein delta Pa1 is smaller than delta Pa2, and alpha 1 is larger than alpha 1 and alpha 2 is smaller than alpha 3; when the central control unit preliminarily judges that the water delivery pressure is insufficient, the central control unit calculates the difference delta Pa between P and P1 and adjusts the pressure Q of the well external pressure device to a corresponding value according to the delta Pa,
if Δ Pa is less than or equal to Δ Pa1, the central control unit judges that Q is adjusted to a corresponding value by using α 1;
if delta Pa1 is less than delta Pa and less than delta Pa2, the central control unit judges that Q is adjusted to a corresponding value by using alpha 2;
if Δ Pa > [ Δ Pa2, the central control unit decides to adjust Q to the corresponding value using α 3;
when the central control unit uses the α i to adjust the Q, setting i to be 1, 2 and 3, and setting Q 'to be Q × α i, wherein the adjusted pressure Q of the well external pressure device is Q'; and when the pressure of the well external pressure device is adjusted to Q ', the central control unit detects the pressure at the corresponding position in the well again and records the pressure as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
Furthermore, a maximum pressure mark Qmax of the external well pressure device is preset in the central control unit, when the central control unit adjusts the pressure of the external well pressure device to Q ', the central control unit compares Q' with Qmax,
if Q ' < Qmax, the central control unit judges that Q ' is within a preset pressure range of the well external pressure device, and the central control unit adjusts the pressure of the well external pressure device to Q ';
if Q 'is more than or equal to Qmax, the central control unit judges that Q' exceeds the pressure of a preset well external pressure device, and the central control unit adjusts the pressure of the well external pressure device to Qmax;
and the central control unit detects the underground pressure again and records the underground pressure as P' when the pressure regulation of the well external pressure device is finished so as to judge whether the pressure at the corresponding position meets the preset value again.
Furthermore, a pitching contact state detector is also arranged in the pitching locking structure and connected with the central control unit for detecting the contact state between the pitching and the sliding sleeve, and the pitching contact state detector can detect the pressure applied to the pitching; the central control unit preliminarily judges the blockage of the sand blasting hole and controls the ball-throwing contact state detector to detect the contact state of the ball throwing and the sliding sleeve,
if the shot ball and the sliding sleeve are in a non-contact state, the central control unit judges that the shot ball does not reach a preset position, so that the sand blasting hole is blocked and needs to be kept stand, and then underground pressure is detected again;
if the pitching ball is in a contact state with the sliding sleeve, the central control unit judges that the pitching ball reaches a preset position, the sliding sleeve breaks down, and the central control unit gives out a sliding sleeve fault alarm.
Further, a first preset pressure difference delta Pb1 and a second preset pressure difference delta Pb2 are arranged in the central control unit, wherein delta Pa1 is smaller than delta Pa 2; when the central control unit preliminarily judges that the sliding sleeve does not reach the preset position, so that the sand blasting hole is blocked and needs to be stood, and then the underground pressure is detected again, the difference value of P and P2' is calculated and recorded as delta Pb, whether the standing time length t is adjusted or not is judged according to the delta Pb, a first preset sliding sleeve standing time length adjusting coefficient beta 1 and a second preset sliding sleeve standing time length adjusting coefficient beta 2 are further arranged in the central control unit, wherein the beta 1 is more than 1 and the beta 2 is more than 2,
if the delta Pb is less than or equal to the delta Pb1, the central control unit judges that the delta Pb is in the standard range, and the sliding sleeve does not need to be adjusted to be kept still for a time t;
if delta Pb1 is less than delta Pb and less than or equal to delta Pb2, the central control unit judges that the sliding sleeve is adjusted to a corresponding value for the standing time t by using beta 1;
if delta Pb is > -delta Pb2, the central control unit judges that the sliding sleeve standing time t is adjusted to a corresponding value by using beta 2;
when the central control unit uses β i to adjust t, setting i to be 1, 2, and setting the adjusted standing time to be t ', and setting t' to be t × β i; and the central control unit detects the bottom pressure again when the sliding sleeve stands still for t 'again, and the pressure is recorded as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
Further, the central control unit is internally provided with a total standing time T0, when the sliding sleeve needs to stand, the central control unit counts the total standing time T of the sliding sleeve in the standing process of the sliding sleeve, sets the total standing time T as T + T',
if T is less than T0, the central control unit judges that the sliding sleeve can continuously stand;
if T is larger than or equal to T0, the central control unit judges that the pitching ball does not reach the designated position, and the central control unit controls the pitching ball contact state detector to detect the pressure applied to the pitching ball.
Further, a first preset ball throwing pressure Pc1 and a second preset ball throwing pressure Pc2 are arranged in the central control unit, wherein Pc1 is less than Pc 2; when the central control unit controls the ball throwing contact state detector to detect the pressure applied to the ball throwing, the pressure is recorded as Pc, whether the pressure M of the supporting liquid output device is adjusted or not is judged according to the range of the pressure, a first preset supporting liquid device output pressure secondary regulating coefficient gamma 1 and a second preset supporting liquid device output pressure secondary regulating coefficient gamma 2 are further arranged in the central control unit, wherein gamma 1 is more than 1 and less than gamma 2,
if Pc is less than or equal to Pc1, the central control unit uses gamma 1 to adjust M;
if Pc1 is more than Pc and less than or equal to Pc2, the central control unit uses gamma 2 to adjust M;
if Pc is more than Pc2, the central control unit judges that the pitching does not reach the designated position, the spring claws of the pitching locking structure are not opened, so that the pitching locking structure does not grab the pitching, and the central control unit gives out a sliding sleeve fault alarm;
when the central control unit uses the gamma i to adjust the M, setting i to be 1, 2, and setting the adjusted pressure of the supporting liquid output device to be M', and setting M to be M multiplied by gamma i; and when the pressure regulation of the supporting liquid output device is finished, the central control unit detects the pressure Pc' applied to the ball to judge whether the pressure at the corresponding position meets the preset value again.
Compared with the prior art, the sand blaster has the advantages that the sand blaster is provided with the pitching locking structure positioned at the end part of the inner sliding sleeve of the sand blaster and the supporting liquid output device positioned at the side of the inner wall of the sand blasting port, so that the problem that the supporting liquid device cannot effectively fill the supporting liquid due to the fact that the sand blasting hole is blocked by pitching is solved, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
Furthermore, a detection mechanism is arranged outside the sand blaster, wherein the detection mechanism comprises an underground pressure detector and a pitching contact state detector, a central control unit is also arranged for controlling each detector in the detection mechanism to detect corresponding underground pressure values, contact states of pitching and a sliding sleeve and pressure received by pitching, the underground condition can be preliminarily judged according to the detection result of the detection mechanism, each pressure value is compared with a preset pressure value, the pressure value at the bottom of the well is input according to the detection result aiming at the preset pressure value, and the standing time is adjusted; the problem of inconvenience in underground detection is effectively solved, so that the detection time is effectively saved, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
Furthermore, the central control unit selects the corresponding adjusting coefficient according to the range of the preset oil well depth where the oil well depth is located to adjust the underground preset pressure value, so that the problem that the preset underground pressure values corresponding to different oil well depths are different is solved, errors of subsequent measurement comparison are avoided, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
Furthermore, the central control unit compares the detected underground pressure value with the preset pressure value, selects a corresponding processing mode according to the comparison result, can effectively detect the underground pressure condition, makes full preparation work for subsequent support liquid filling, and further improves the operating efficiency of the sand blaster in the fracturing process of the oil well.
Further, when the central control unit judges that the water injection amount pressure is insufficient, the corresponding adjusting parameters are selected according to the range of the difference value of the underground pressure and the preset pressure to adjust the pressure of the well external pressure device so that the underground pressure reaches the standard range, and the underground pressure can be adjusted in a targeted manner, so that the subsequent support liquid filling is fully prepared, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
Furthermore, when the central control unit regulates the pressure of the well external pressure device, the central control unit detects the pressure of the well external pressure device in real time and compares the pressure with the maximum pressure of the preset well external pressure device, and selects a corresponding processing mode according to the comparison result, so that the pressure of the well external pressure device can be detected in real time and controlled to be less than or equal to the pressure of the preset maximum well external pressure device, thereby effectively improving the safety of the underground sand blaster provided by the invention and further improving the operating efficiency of the sand blaster provided by the invention in the fracturing process of an oil well.
Furthermore, the central control unit controls the shot contact state detector to detect the contact state of the shot and the sliding sleeve, and selects a corresponding processing mode according to the detection result, so that whether the shot reaches a specified position can be accurately detected, and whether the sliding sleeve has a fault can be judged, thereby effectively judging the blockage of the sand blasting hole or the fault of the sliding sleeve, and further improving the operating efficiency of the sand blaster in the fracturing process of an oil well.
Furthermore, when the central control unit judges that the shot needs to stand when reaching the designated position, the central control unit calculates the difference value between the underground pressure and the preset pressure, selects the corresponding adjusting parameter according to the range of the preset difference value to adjust the standing time, and re-detects the underground pressure after standing again, so that the detection time can be saved, the problem that the shot does not reach the designated position is effectively solved, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
Furthermore, the central control unit counts the total time of multiple standing and compares the total time with the preset total time, and selects a corresponding processing mode according to the comparison result, so that the condition that the non-standing time is insufficient to influence the condition that the shot does not reach the designated position can be avoided, the detection time and the standing time are effectively saved, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
Furthermore, the central control unit judges that the shot does not reach the designated position, controls the shot contact state detector to detect the pressure applied to the shot and compare the pressure with the preset pressure, selects a corresponding processing mode according to the comparison result, and can effectively solve the problem of insufficient pressure output by the supporting liquid device through regulating the pressure of the supporting liquid output device, thereby making full preparation work for subsequent filling of the supporting liquid and further improving the operating efficiency of the sand blaster in the fracturing process of an oil well.
Drawings
FIG. 1 is a schematic structural diagram of a sand blaster for multi-layer fracturing according to an embodiment of the invention;
fig. 2 is a block diagram of an external system of a sand blaster for multi-layer fracturing according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a sand blaster for multi-layer fracturing according to an embodiment of the invention. The sand blaster for multi-layer fracturing comprises:
the sand blaster main body is used for forming cracks on an oil-gas layer in an oil well under the action of water power and comprises an upper joint, a central pipe connected with the output end of the upper joint, a lower joint connected with the output end of the central pipe and a sliding sleeve arranged inside the central pipe, wherein a sand outlet is formed in the side wall of the central pipe, and part of the sliding sleeve is positioned inside the central pipe and used for sealing the sand outlet; the sand blaster also comprises a shot used for sequentially passing through the upper joint and the interior of the central pipe to push the sliding sleeve to a corresponding position when the sand blaster operates;
the shot locking structure is positioned at the end part of the sliding sleeve in the sand blaster, the top end of the locking structure is provided with a spring claw, and the spring claw is provided with a clamping structure used for locking a shot when the shot reaches the end part of the sliding sleeve;
a supporting liquid output device which is positioned at the side of the inner wall of the sand blasting opening and is used for outputting the supporting liquid from the inner part of the sand blasting opening to the outside;
fig. 2 is a block diagram of an external system of a sand blaster for multi-layer fracturing according to the invention. Which comprises the following steps:
the detection unit comprises a plurality of underground pressure detectors which are positioned at corresponding positions on the outer wall of the sand blaster to detect the pressure of the corresponding underground positions in real time, a plurality of ball throwing contact state detectors which are respectively positioned on the end surfaces of the sliding sleeves close to one side of the upper joint to detect the contact state of the ball throwing and the sliding sleeves, and an external pressurizing device pressure detector which is positioned outside a well and used for inputting the pressure underground;
and the central control unit is respectively connected with each underground pressure detector and each ball throwing pressure detector and is used for determining a preset pressure value in the oil well according to the depth of the oil well, selecting a corresponding processing mode according to the actually measured pressure value when the underground pressure is judged not to meet the preset standard, and judging whether parameters in the corresponding processing mode are subjected to targeted adjustment or not according to the difference value between the actually measured pressure value and the preset standard when the processing mode is selected.
Specifically, the front rotary adjusting ring 2 is used, the elastic force of the pressing spring 3 is output rightwards to press the valve 5, the matching tightness of the valve 5 and the valve seat 8 is adjusted according to the actual situation in the using process, so that the sand blaster can prevent the fluid in the sand blaster from flowing reversely or overflowing under different conditions,
specifically, the sliding sleeve 12 is preliminarily fixed by the shear pins 7 before the sliding sleeve 12 is pushed by a shot, the valve seat 8 is fixedly connected to the lower joint 11 by the fixing pins 10, and the sliding sleeve 12 is locked by the spring claws 13 at the lower end of the sliding sleeve 12 when the sliding sleeve 12 falls into the next-stage sand blasting channel; the sand blasters connected end to end are matched with the upper joint of the next level by the locking head 15 at the lower end of the upper level so as to fix the sand blasters at the designated position.
Specifically, in order to increase the sealing performance, the valve 5 and the central tube 4 are sealed by a first O-shaped sealing ring 6, the valve seat 8 and the lower joint 11 are connected through threads and are sealed by a second O-shaped sealing ring 9, and the locking joint 15 and the lower joint 11 are sealed by a third O-shaped sealing ring 14;
when the sand blaster is used, a plurality of sand blasters are connected end to end, and the locking head 15 at the lower end of each sand blaster is matched with the groove in the upper joint at the next level to ensure that the sand blasters are fixed at the specified position
Before use the valve 2 is rotated to adjust the tightness of the valve 5 and the valve seat 8 to the corresponding values.
When the fracturing device works, the sliding sleeve 12 is not arranged in the sand blaster at the bottommost layer, and a supporting liquid output device (not shown in the figure) on the inner wall of a sand blasting port sprays out supporting liquid to directly perform fracturing.
After the sand blasting of the bottommost layer is finished, the shot enters the interior of the sand blaster, the sliding sleeve 12 is pushed, the shear pin 7 is broken under stress, the sliding sleeve 12 is displaced, the sliding sleeve 12 falls into the sand blaster of the bottommost layer, and the sliding sleeve 12 is locked by a guide inclined plane at the lower end of the sliding sleeve 12 and a clamping structure in the spring claw 13 when the shot reaches the position; the shot is put down and then reaches the top end of the sliding sleeve 12, and under the action of pressure, the shot enters a shot locking structure (not shown in the figure) at the top end of the sliding sleeve 12, the sand blasting port at the bottommost layer is in a blocking state, the sand blasting port at the second layer is unblocked, and a supporting liquid output device (not shown in the figure) on the inner wall of the sand blasting port ejects the supporting liquid to perform fracturing. Similarly, the subsequent sand blasters on each layer work as above.
After the top layer fracturing is finished, the sand outlets of the sand blasters at the top layer are plugged by sliding sleeve type sealers, and the sand outlets of all the sand blasters are in a closed state, so that a passage for the stratum to enter the oil pipe is blocked, and the liquid spraying prevention in the oil pipe after fracturing is realized.
The sand blaster has the advantages that the sand blaster is provided with a pitching locking structure located at the end part of the sliding sleeve in the sand blaster, and a supporting liquid output device located on the side of the inner wall of a sand blasting port, so that the problem that the supporting liquid device cannot effectively fill the supporting liquid due to blocking of a sand blasting hole by pitching is solved; the problem of inconvenience in underground detection is effectively solved, so that the detection time is effectively saved, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
The central control unit is provided with a first preset depth H1 of an oil well, a second preset depth H2 of the oil well, a first preset underground pressure regulating coefficient e1, a second preset underground pressure regulating coefficient e2, a first preset underground pressure P1 and a second preset underground pressure P2, wherein H1 is more than H2, 1 is more than e1 and more than e2, and P1 is more than P2; before the sand blaster is used, the central control unit judges whether the preset well descending pressure at the corresponding position is adjusted to the corresponding value when the sand blaster is put down the well according to the depth of the oil well,
if H is less than or equal to H1, the central control unit judges that no adjustment is needed to P1 or P2;
if H1 < H ≦ H2, the central control unit decides to adjust P1 and P2 to the corresponding values using e 1;
if H > H2, the central control unit decides to adjust P1 and P2 to the corresponding values using e 2;
when the central control unit uses ei to adjust P1 and P2, setting i to be 1 and 2, recording the adjusted preset pressure values as P1 'and P2', setting P1 to be P1 × ei, and setting P2 to be P2 × ei; and the central control unit adjusts the preset pressure to a corresponding value, and compares the detected underground pressure value with the preset underground pressure value in the central control unit.
Specifically, the central control unit selects the corresponding adjusting coefficient to adjust the underground preset pressure value according to the range of the preset oil well depth where the oil well depth is located, and the problem that the preset underground pressure values corresponding to different oil well depths are different is solved, so that the error of subsequent measurement comparison is avoided, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
The central control unit is internally provided with a first preset underground pressure P1 'and a second preset underground pressure P2'; when the underground pressure detector detects the underground pressure in real time, the detected underground pressure value is compared with the preset underground pressure value in the central control unit, the actual pressure of the corresponding position detected by the underground pressure detector in the working process is recorded as P,
if P is less than or equal to P1', the central control unit preliminarily judges that the pressure of the well external pressure device is insufficient, calculates the difference value between P and P1, and adjusts the output pressure to a corresponding value according to delta Pa and delta Pa;
if P is more than P1 '< P is less than or equal to P2', the central control unit judges that the underground pressure meets the preset value;
if P is more than P2', the central control unit preliminarily judges that the sand blasting hole is blocked, and the central control unit controls the ball throwing contact state detector to detect the contact state of the ball throwing and the sliding sleeve.
Specifically, the central control unit compares the detected underground pressure value with a preset pressure value, selects a corresponding processing mode according to the comparison result, can effectively detect the underground pressure condition, makes sufficient preparation work for subsequent filling of the supporting fluid, and further improves the operating efficiency of the sand blaster in the fracturing process of the oil well.
A first preset underground pressure difference delta Pa1, a second preset underground pressure difference delta Pa2, a first preset pressure adjusting coefficient alpha 1, a second preset pressure adjusting coefficient alpha 2 and a third preset pressure adjusting coefficient alpha 3 are arranged in a central control unit, wherein delta Pa1 is less than delta Pa2, and alpha 1 is more than alpha 1 and less than alpha 2 and less than alpha 3; when the central control unit preliminarily judges that the water delivery pressure is insufficient, the central control unit calculates the difference delta Pa between P and P1 and adjusts the pressure Q of the well external pressure device to a corresponding value according to the delta Pa,
if Δ Pa is less than or equal to Δ Pa1, the central control unit judges that Q is adjusted to a corresponding value by using α 1;
if delta Pa1 is less than delta Pa and less than delta Pa2, the central control unit judges that Q is adjusted to a corresponding value by using alpha 2;
if Δ Pa > [ Δ Pa2, the central control unit decides to adjust Q to the corresponding value using α 3;
when the central control unit uses the α i to adjust the Q, setting i to be 1, 2 and 3, and setting Q 'to be Q × α i, wherein the adjusted pressure Q of the well external pressure device is Q'; and when the pressure of the well external pressure device is adjusted to Q ', the central control unit detects the pressure at the corresponding position in the well again and records the pressure as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
Specifically, when the central control unit judges that the water injection amount pressure is insufficient, the corresponding adjusting parameters are selected according to the range of the difference value of the underground pressure and the preset pressure to adjust the pressure of the well external pressure device so that the underground pressure reaches the standard range, and the underground pressure can be adjusted in a targeted manner, so that the subsequent support liquid filling is fully prepared, and the operation efficiency of the sand blaster in the fracturing process of an oil well is further improved.
Furthermore, a maximum pressure mark Qmax of the external well pressure device is preset in the central control unit, when the central control unit adjusts the pressure of the external well pressure device to Q ', the central control unit compares Q' with Qmax,
if Q ' < Qmax, the central control unit judges that Q ' is within a preset pressure range of the well external pressure device, and the central control unit adjusts the pressure of the well external pressure device to Q ';
if Q 'is not less than Qmax, the central control unit judges that Q' exceeds the pressure of a preset well external pressure device, and the central control unit adjusts the pressure of the well external pressure device to Qmax;
and the central control unit detects the underground pressure again and records the underground pressure as P' when the pressure regulation of the well external pressure device is finished so as to judge whether the pressure at the corresponding position meets the preset value again.
Specifically, when the central control unit regulates the pressure of the well external pressure device, the central control unit detects the pressure of the well external pressure device in real time and compares the pressure with the maximum pressure of a preset well external pressure device, and selects a corresponding processing mode according to the comparison result, so that the pressure of the well external pressure device can be detected in real time and controlled to be less than or equal to the pressure of the preset maximum well external pressure device, thereby effectively improving the safety of the underground sand blaster provided by the invention and further improving the operating efficiency of the sand blaster provided by the invention in the fracturing process of an oil well.
Furthermore, a pitching contact state detector is also arranged in the pitching locking structure and connected with the central control unit for detecting the contact state between the pitching and the sliding sleeve, and the pitching contact state detector can detect the pressure applied to the pitching; the central control unit preliminarily judges that the sand blasting hole is blocked and controls the ball throwing contact state detector to detect the contact state of the ball throwing and the sliding sleeve,
if the shot ball and the sliding sleeve are in a non-contact state, the central control unit judges that the shot ball does not reach a preset position, so that the sand blasting hole is blocked and needs to be kept stand, and then underground pressure is detected again;
if the bowling with the sliding sleeve is in a contact state, the central control unit judges that the bowling reaches a preset position, the sliding sleeve breaks down, and the central control unit gives out a sliding sleeve fault alarm.
Specifically, the central control unit controls the shot contact state detector to detect the contact state of the shot and the sliding sleeve, and selects a corresponding processing mode according to the detection result, so that whether the shot reaches a specified position can be accurately detected, and whether the sliding sleeve has a fault can be judged, thereby effectively judging the blockage of a shot hole or the fault of the sliding sleeve, and further improving the operating efficiency of the sand blaster in the fracturing process of an oil well.
Further, a first preset pressure difference delta Pb1 and a second preset pressure difference delta Pb2 are arranged in the central control unit, wherein delta Pa1 is smaller than delta Pa 2; when the central control unit preliminarily judges that the sliding sleeve does not reach the preset position, so that the sand blasting hole is blocked and needs to be stood, and then the underground pressure is detected again, the difference value of P and P2' is calculated and recorded as delta Pb, whether the standing time length t is adjusted or not is judged according to the delta Pb, a first preset sliding sleeve standing time length adjusting coefficient beta 1 and a second preset sliding sleeve standing time length adjusting coefficient beta 2 are further arranged in the central control unit, wherein the beta 1 is more than 1 and the beta 2 is more than 2,
if the delta Pb is less than or equal to the delta Pb1, the central control unit judges that the delta Pb is in the standard range, and the sliding sleeve does not need to be adjusted to be kept still for a time t;
if delta Pb1 is less than delta Pb and less than or equal to delta Pb2, the central control unit judges that the sliding sleeve is adjusted to a corresponding value for the standing time t by using beta 1;
if delta Pb is > -delta Pb2, the central control unit judges that the sliding sleeve standing time t is adjusted to a corresponding value by using beta 2;
when the central control unit uses β i to adjust t, setting i to be 1, 2, and setting the adjusted standing time to be t ', and setting t' to be t × β i; and the central control unit detects the bottom pressure again when the sliding sleeve stands still for t 'again, and the pressure is recorded as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
Specifically, when the central control unit judges that the shot needs to stand when reaching the designated position, the central control unit calculates the difference between the underground pressure and the preset pressure, selects the corresponding adjusting parameter according to the range of the preset difference to adjust the standing time, and re-detects the underground pressure after standing again, so that the detection time can be saved, the problem that the shot does not reach the designated position is effectively solved, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
Further, the central control unit is internally provided with a total standing time T0, when the sliding sleeve needs to stand, the central control unit counts the total standing time T of the sliding sleeve in the standing process of the sliding sleeve, sets the total standing time T as T + T',
if T is less than T0, the central control unit judges that the sliding sleeve can continuously stand;
if T is larger than or equal to T0, the central control unit judges that the pitching ball does not reach the designated position, and the central control unit controls the pitching ball contact state detector to detect the pressure applied to the pitching ball.
Specifically, the central control unit counts the total time of multiple standing and compares the total time with the preset total time, and selects a corresponding processing mode according to the comparison result, so that the condition that the non-standing time is not short and the pitching does not reach the designated position can be avoided, the detection time and the standing time are effectively saved, and the operation efficiency of the sand blaster in the fracturing process of the oil well is further improved.
Further, a first preset ball throwing pressure Pc1 and a second preset ball throwing pressure Pc2 are arranged in the central control unit, wherein Pc1 is less than Pc 2; when the central control unit controls the pitching contact state detector to detect the pressure applied to the pitching, the pressure is recorded as Pc, whether the pressure M of the supporting liquid output device is adjusted or not is judged according to the range of the pressure, a first preset supporting liquid device output pressure secondary adjustment coefficient gamma 1 and a second preset supporting liquid device output pressure secondary adjustment coefficient gamma 2 are further arranged in the central control unit, wherein gamma 1 is more than 1 and more than gamma 2,
if Pc is less than or equal to Pc1, the central control unit uses gamma 1 to adjust M;
if Pc1 is more than Pc and less than or equal to Pc2, the central control unit uses gamma 2 to regulate M;
if Pc is more than Pc2, the central control unit judges that the ball is thrown to a specified position, the spring claw of the ball throwing locking structure is not opened, so that the ball throwing locking structure does not grab the ball, and the central control unit gives out a sliding sleeve fault alarm;
when the central control unit uses the gamma i to adjust the M, setting i to be 1, 2, and setting the adjusted pressure of the supporting liquid output device to be M', and setting M to be M multiplied by gamma i; and when the pressure regulation of the supporting liquid output device is finished, the central control unit detects the pressure Pc' applied to the ball to judge whether the pressure at the corresponding position meets the preset value again.
Specifically, the central control unit judges that the shot does not reach the designated position, controls the shot contact state detector to detect the pressure applied to the shot and compare the pressure with the preset pressure, selects a corresponding processing mode according to the comparison result, can effectively solve the problem of insufficient pressure output by the supporting liquid device through adjusting the pressure of the supporting liquid output device, thereby making full preparation work for subsequent filling of the supporting liquid and further improving the working efficiency of the sand blaster in the fracturing process of an oil well
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Example 1
This example will be described in detail using a four-layer fracturing construction using the sand blaster of the present invention,
step s1, setting corresponding levels and numbers of well tools according to the oil exploitation requirements; the sand blaster comprises four types of sand blasters with the diameter of A, B, C, D, wherein the sand blaster A at the bottommost layer is not provided with a sliding sleeve, and the sand blasters B, C, D are provided with sliding sleeves.
Step s2, the central control unit adjusts the preset pressure according to the depth of the oil well, the oil pipe starts to be pressurized from an external pressurizing device, the underground pressure detector detects the underground pressure value after pressurization is completed and compares the underground pressure value with the adjusted preset pressure value, the underground pressure value is smaller than the first preset underground pressure value, the central control unit calculates the difference value between the underground pressure and the adjusted preset pressure value, the adjusting coefficient is selected according to the difference value range to adjust the output pressure value, the underground pressure is within the standard value range after adjustment is completed, and the step s3 is carried out;
step s3, the sand blaster A at the bottommost layer is not provided with a sliding sleeve, the channel of the sand blaster at the lowest layer is directly opened, and a supporting fluid output device injects a supporting agent to fracture the bottommost layer;
step s4, throwing balls matched with the specifications of the sliding sleeve of the sand blaster B, shearing pins of the sliding sleeve of the sand blaster B, pushing the sliding sleeve into a center tube of the sand blaster B, detecting that the down-hole pressure value is larger than the second preset pressure value after adjustment by using a down-hole pressure detector, judging that a sand blasting hole is blocked by using a central control unit, detecting that the balls and the sliding sleeve are in a non-contact state by using a ball throwing contact state detector, calculating a difference value between the down-hole pressure value and the second preset pressure value after adjustment by using the central control unit, selecting an adjustment coefficient according to the difference value range to adjust the standing time, after standing is completed again, throwing the balls into a ball throwing locking structure, and performing step 5;
step 5, pushing the sliding sleeve of the sand blaster B to the sand blaster A to seal a sand blaster channel, opening a sand blasting hole of the sand blaster at the upper stage, and simultaneously injecting a propping agent to start fracturing the second layer;
step s6, after the second layer fracturing is finished, throwing balls matched with the specifications of the sand blaster C sliding sleeve, shearing off the sand blaster C sliding sleeve pins, pushing the sliding sleeve into the sand blaster B central tube, detecting that the underground pressure value is within the preset standard pressure value range by the underground pressure detector, and carrying out step 7;
step 7, pushing the sliding sleeve of the sand blaster C to the sand blaster B to seal a sand blaster channel, opening a sand blasting hole of the sand blaster at the upper stage, and simultaneously injecting a propping agent to start fracturing a third layer;
step s8, after the third layer of fracturing is finished, throwing a ball matched with the specification of a sand blaster D sliding sleeve, shearing a pin of the sand blaster D sliding sleeve, pushing the sliding sleeve into a sand blaster C center pipe, detecting a downhole pressure value by a downhole pressure detector, comparing the downhole pressure value with an adjusted preset pressure value, wherein the downhole pressure value is smaller than a first preset downhole pressure value, a central control unit calculates a difference value between the downhole pressure and the adjusted preset pressure, selects an adjusting coefficient according to the difference value range to adjust an output pressure value, the output pressure value is larger than the maximum pressure value of a pressurizing device, the central control unit controls the pressurizing device to pressurize the oil pipe by using the maximum pressure value of the device, the downhole pressure is within a preset standard pressure value range after the pressurizing is finished, and the step 9 is carried out;
and 9, pushing the sliding sleeve of the sand blower D to the sand blower C to seal a sand blower channel, opening a sand blasting hole of the sand blower of the upper stage, and injecting a propping agent to start fracturing the fourth layer.
And step 10, starting to flow back fracturing fluid according to process requirements, and returning the fracturing fluid into an oil pipe through a check valve at the bottom of the pipe column and sliding sleeve return channels of the sand blasters at all stages, wherein the ground oil pipe adopts a nozzle for open flow and return discharge.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sand blaster for multi-layer fracturing, comprising:
the sand blaster main body is used for forming cracks on an oil-gas layer in an oil well under the action of water power and comprises an upper joint, a central pipe connected with the output end of the upper joint, a lower joint connected with the output end of the central pipe and a sliding sleeve arranged inside the central pipe, wherein a sand outlet is formed in the side wall of the central pipe, and part of the sliding sleeve is positioned inside the central pipe and used for sealing the sand outlet; the sand blaster also comprises a shot ball which is used for sequentially passing through the upper joint and the inner part of the central pipe to push the sliding sleeve to a corresponding position when the sand blaster runs;
the shot locking structure is positioned at the end part of the sliding sleeve in the sand blaster, the top end of the locking structure is provided with a spring claw, and the spring claw is provided with a clamping structure used for locking a shot when the shot reaches the end part of the sliding sleeve;
and the supporting liquid output device is positioned on the side of the inner wall of the sand blasting port and is used for outputting the supporting liquid from the inside of the sand blasting port to the outside.
2. The sand blaster for multi-layer fracturing as claimed in claim 1, wherein the sand blaster is externally provided with a detection unit and a central control unit, wherein:
the detection unit comprises a plurality of underground pressure detectors which are positioned at corresponding positions on the outer wall of the sand blaster to detect the pressure of the corresponding positions underground in real time, a plurality of ball throwing contact state detectors which are respectively positioned on the end surfaces of the sliding sleeves close to one side of the upper joint to detect the contact state of the ball throwing and the sliding sleeves, and an external pressurizing device pressure detector which is positioned outside the well and used for inputting the pressure underground;
the central control unit is respectively connected with each underground pressure detector and each ball throwing pressure detector and is used for determining a preset pressure value in the oil well according to the depth of the oil well, selecting a corresponding processing mode according to an actually measured pressure value when the underground pressure is judged not to meet a preset standard, and judging whether parameters in the corresponding processing mode are subjected to targeted adjustment or not according to a difference value between the actually measured pressure value and the preset standard when the processing mode is selected.
3. The sand blaster for multi-layer fracturing as claimed in claim 2, wherein the central control unit is provided with a first preset depth H1 of the oil well, a second preset depth H2 of the oil well, a first preset underground pressure regulating coefficient e1, a second preset underground pressure regulating coefficient e2, a first preset downhole pressure P1 and a second preset downhole pressure P2, wherein H1 < H2, 1 < e1 < e2, and P1 < P2; before the sand blaster is used, the central control unit judges whether the preset well descending pressure of the corresponding position is adjusted to the corresponding value when the sand blaster descends the well according to the depth of the oil well,
if H is less than or equal to H1, the central control unit judges that no adjustment is needed to P1 or P2;
if H1 < H ≦ H2, the central control unit decides to adjust P1 and P2, respectively, to the corresponding values using e 1;
if H > H2, the central control unit decides to use e2 to adjust P1 and P2 to corresponding values, respectively;
when the central control unit uses ei to adjust P1 and P2, i is set to be 1 and 2, the adjusted preset pressure values are recorded as P1 'and P2', P1 'is set to be P1 × ei, and P2' is set to be P2 × ei.
4. The sand blaster for multi-layer fracturing as claimed in claim 3, wherein the adjusted first preset downhole pressure P1 'and second preset downhole pressure P2' in the central control unit; when the underground pressure detector detects the underground pressure in real time, the detected underground pressure value is compared with the preset underground pressure value in the central control unit, the actual pressure of the corresponding position detected by the underground pressure detector in the working process is marked as P,
if P is less than or equal to P1 ', the central control unit preliminarily judges that the pressure of the well external pressure device is insufficient, calculates the difference value between P and P1 ', and sets P1 ' -P as the output pressure is adjusted to a corresponding value according to the delta Pa and the delta Pa;
if P is more than P1 '< P is less than or equal to P2', the central control unit judges that the underground pressure meets the preset value;
if P > P2', the well accuse unit tentatively judges that the sandblast hole blocks up, well accuse unit control the bowling contact state detector detects the contact state of bowling with the sliding sleeve.
5. The sand blaster for multi-layer fracturing as claimed in claim 4, wherein a first preset downhole pressure difference Δ Pa1, a second preset downhole pressure difference Δ Pa2, a first preset pressure adjustment coefficient α 1, a second preset pressure adjustment coefficient α 2 and a third preset pressure adjustment coefficient α 3 are provided in the central control unit, wherein Δ Pa1 is less than Δ Pa2, and 1 < α 2 < α 3; when the central control unit preliminarily judges that the water delivery pressure is insufficient, the central control unit calculates the difference delta Pa between P and P1 and adjusts the pressure Q of the well external pressure device to a corresponding value according to the delta Pa,
if Δ Pa is less than or equal to Δ Pa1, the central control unit judges that Q is adjusted to a corresponding value by using α 1;
if Δ Pa1 < Δ Pa ≦ Δ Pa2, the central control unit determines to adjust Q to the corresponding value using α 2;
if Δ Pa > [ Δ Pa2, the central control unit decides to adjust Q to the corresponding value using α 3;
when the central control unit uses the α i to adjust the Q, setting i to be 1, 2 and 3, and setting Q 'to be Q × α i, wherein the adjusted pressure Q of the well external pressure device is Q'; and when the pressure of the well external pressure device is adjusted to Q ', the central control unit detects the pressure at the corresponding position in the well again and records the pressure as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
6. The sand blaster for multi-layer fracturing as claimed in claim 5, wherein a maximum pressure mark Qmax of the well external pressure device is preset in the central control unit, and when the central control unit adjusts the pressure of the well external pressure device to Q ', the central control unit compares Q' with Qmax,
if Q ' < Qmax, the central control unit judges that Q ' is within a preset pressure range of the well external pressure device, and the central control unit adjusts the pressure of the well external pressure device to Q ';
if Q 'is not less than Qmax, the central control unit judges that Q' exceeds the pressure of a preset well external pressure device, the central control unit adjusts the pressure of the well external pressure device to Qmax, and the central control unit judges that the sliding sleeve is jammed and gives a fault alarm;
and the central control unit detects the underground pressure again and records the underground pressure as P' when the pressure regulation of the well external pressure device is finished so as to judge whether the pressure at the corresponding position meets the preset value again.
7. The sand blaster for the multilayer fracturing as claimed in claim 4, wherein a pitching contact state detector is further arranged in the pitching locking structure, the pitching contact state detector is connected with the central control unit and is used for detecting the contact state between the pitching and the sliding sleeve, and the pitching contact state detector can detect the pressure applied to the pitching; the central control unit preliminarily judges that the sand blasting hole is blocked and controls the ball throwing contact state detector to detect the contact state of the ball throwing and the sliding sleeve,
if the shot ball and the sliding sleeve are in a non-contact state, the central control unit judges that the shot ball does not reach a preset position, so that the sand blasting hole is blocked and needs to be kept stand, and then underground pressure is detected again;
if the pitching ball is in a contact state with the sliding sleeve, the central control unit judges that the pitching ball reaches a preset position, the sliding sleeve breaks down, and the central control unit gives out a sliding sleeve fault alarm.
8. The sand blaster for multi-layer fracturing as claimed in claim 7, wherein a first preset pressure difference Δ Pb1 and a second preset pressure difference Δ Pb2 are provided in the central control unit, a first preset slide sleeve standing time length adjustment coefficient β 1 and a second preset slide sleeve standing time length adjustment coefficient β 2 are provided, wherein Δ Pb1 is less than Δ Pb2, 1 < β 2; when the central control unit preliminarily judges that the sliding sleeve does not reach the preset position, so that the sand blasting hole is blocked and needs to be placed, and then the underground pressure is detected again, the central control unit calculates the difference value delta Pb between P and P2 ', judges whether the standing time t is adjusted or not according to the delta Pb, sets the delta Pb as P-P2',
if the delta Pb is less than or equal to the delta Pb1, the central control unit judges that the delta Pb is in the standard range, and the sliding sleeve does not need to be adjusted to be kept still for a time t;
if delta Pb1 is less than delta Pb and less than or equal to delta Pb2, the central control unit judges that the sliding sleeve is adjusted to a corresponding value for the standing time t by using beta 1;
if delta Pb is > -delta Pb2, the central control unit judges that the sliding sleeve standing time t is adjusted to a corresponding value by using beta 2;
when the central control unit uses β i to adjust t, setting i to be 1, 2, and setting the adjusted standing time to be t ', and setting t' to be t × β i; and the central control unit detects the bottom pressure again when the sliding sleeve stands still for t 'again, and the pressure is recorded as P' so as to judge whether the pressure at the corresponding position meets the preset value again.
9. The sand blaster for the multilayer fracturing as claimed in claim 8, wherein the central control unit is provided with a total standing time T0, when the sliding sleeve is judged to be required to be standing, the central control unit counts the total standing time T of the sliding sleeve in the standing process of the sliding sleeve, the total standing time T is set as T + T',
if T is less than T0, the central control unit judges that the sliding sleeve can continuously stand;
if T is larger than or equal to T0, the central control unit judges that the pitching ball does not reach the designated position, and the central control unit controls the pitching ball contact state detector to detect the pressure applied to the pitching ball.
10. The sand blaster for multi-layer fracturing as claimed in claim 9, wherein a first preset shot pressure Pc1 and a second preset shot pressure Pc2 are provided in the central control unit, wherein Pc1 < Pc 2; when the central control unit controls the pitching contact state detector to detect the pressure applied to the pitching, the pressure is recorded as Pc, whether the pressure M of the supporting liquid output device is adjusted or not is judged according to the range of the pressure, a first preset supporting liquid device output pressure secondary adjustment coefficient gamma 1 and a second preset supporting liquid device output pressure secondary adjustment coefficient gamma 2 are further arranged in the central control unit, wherein gamma 1 is more than 1 and more than gamma 2,
if Pc is less than or equal to Pc1, the central control unit uses gamma 1 to adjust M;
if Pc1 is more than Pc and less than or equal to Pc2, the central control unit uses gamma 2 to adjust M;
if Pc is more than Pc2, the central control unit judges that the ball is thrown to a specified position, the spring claw of the ball throwing locking structure is not opened, so that the ball throwing locking structure does not grab the ball, and the central control unit gives out a sliding sleeve fault alarm;
when the central control unit uses the gamma i to adjust the M, setting i to be 1, 2, and setting the adjusted pressure of the supporting liquid output device to be M', and setting M to be M multiplied by gamma i; and when the pressure regulation of the supporting liquid output device is finished, the central control unit detects the pressure Pc' applied to the ball to judge whether the pressure at the corresponding position meets the preset value again.
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| CN110067547A (en) * | 2019-04-19 | 2019-07-30 | 中国石油天然气股份有限公司 | One kind being suitable for pressure and drives with intelligent fracturing sliding bush |
| US20210238955A1 (en) * | 2020-02-05 | 2021-08-05 | University Of Electronic Science And Technology Of China | Method for controlling toe-end sliding sleeve of horizontal well based on efficient decoding communication |
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| CN113482571A (en) * | 2021-08-25 | 2021-10-08 | 大庆长垣能源科技有限公司 | Hydraulic control pressure cipher open type infinite delay toe end sliding sleeve |
| CN114458222A (en) * | 2022-02-15 | 2022-05-10 | 大庆长垣能源科技有限公司 | Oil gas engineering integration well completion system |
| CN114517669A (en) * | 2022-03-06 | 2022-05-20 | 大庆乾斯晨石油科技开发有限公司 | Intelligent flow control adjusting equipment based on water injection well |
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