A method for re-entering a wellbore of a horizontal well with ultra-short radius

Abstract

The present application relates to the field of oil and gas field drilling development technology, and particularly relates to a reentry method of an ultra-short radius horizontal well bore, which uses a slider arranged in a guide tool, and realizes the rotational displacement of the guide tool in the horizontal direction by the principle of lifting the swing joint of the slider after pressing, so that the effect of horizontally entering the lateral drilling hole by the running string without fulcrum in the vertical section is realized, and then the deflection angle of the guide tool and the change of the drilling pressure are measured by a gyroscope inserted into the drill pipe string, and the lateral drilling hole is positioned and inserted. The reentry guide tool of the well hole is designed to solve the problem that there is no support point in the vertical section of the well bore, and the running tool moves downward under the action of gravity and does not enter the lateral drilling hole. Through the design of the reentry guide tool and the reasonable construction method, the running string and the like successfully enter the lateral drilling hole, the horizontal section is fractured, the running string is unblocked, and the like, and the oil production capacity of the well hole is restored and improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas field drilling and development technology, and particularly relates to a re-entry method of a super-short radius horizontal well bore. BACKGROUND

[0002] In recent years, the super-short radius sidetracking horizontal well technology has been widely applied in domestic oilfields as a precise reserve targeting tapping technology. However, for the well with multiple branch holes and other oil layers below the sidetracking target layer, the whipstock is fished out after sidetracking due to the consideration of the casing passability of the original well bore, which leads to the problems that the fracturing in the horizontal section, the treatment of the well bore blockage and the like need to take the well bore reaming operation or lower other tools, and the reaming and the like cannot be carried out due to the absence of the azimuthal guidance.

[0003] Therefore, it is urgent to design a re-entry method of a super-short radius horizontal well bore, which can solve the problem that there is no support point in the vertical section well bore and the reaming tool moves downward under the action of gravity and does not enter the sidetracking well bore by designing a well bore re-entry guide tool. SUMMARY

[0004] The re-entry method of the super-short radius horizontal well bore provided by the present application can solve the problem that there is no support point in the vertical section well bore and the reaming tool moves downward under the action of gravity and does not enter the sidetracking well bore by designing a well bore re-entry guide tool.

[0005] In order to achieve the above-mentioned target, the technical scheme of the present application is as follows: a re-entry tool of a super-short radius horizontal well bore, comprising a drill pipe, a gyroscope, a UBHO seat key short circuit, a guide tool, a short circuit and a reaming bit, the top surface of the guide tool is detachably installed with the UBHO seat key short circuit, the gyroscope is detachably inserted in the UBHO seat key short circuit, and the drill pipe is installed on the top surface of the UBHO seat key short circuit; the bottom of the guide tool is detachably installed with the short circuit, and the bottom surface of the short circuit is connected with the reaming bit; the guide tool is provided with a swing part which can swing and deviate in the horizontal direction.

[0006] Further, the guiding tool comprises an upper joint, a movable arm, a ball joint and a swing joint, the end of the upper joint is rotationally connected with the swing joint through the ball joint, a limiting shoulder is fixedly installed at the end of the upper joint, a limiting clamping groove is arranged on the top surface of the swing joint, the limiting shoulder is wedge-shaped, the inner diameter of the limiting clamping groove is larger than the limiting shoulder, a pushing groove is arranged on the opposite surface of the limiting shoulder, and the movable arm is fixedly installed on the opposite surface of the swing joint and is fixedly connected with the swing joint.

[0007] Further, a sliding block is slidably installed in the upper joint, the outer diameter of the sliding block is matched with the inner diameter of the upper joint, and a top eave is arranged on one side of the sliding block and matched with the slot of the pushing groove.

[0008] A re-entry method of an ultra-short radius horizontal well bore, comprising the following steps:

[0009] S1: Since the upper joint of the guiding tool is detachably connected with the seat key of the UBHO seat key short connection, the upper joint of the guiding tool is fixedly connected with the seat key of the UBHO seat key short connection and is placed on the workbench;

[0010] S2: The high edge of the guiding tool installed with the UBHO seat key short connection is adjusted to the vertical direction by using a triangular level, so as to ensure that it is perpendicular to the horizontal plane, and a mark is made on the surface of the guiding tool;

[0011] S3: The gyroscope is inserted into the UBHO seat key short connection, the gyroscope is rotated, the high edge direction of the gyroscope is consistent with the high edge direction of the guiding tool, and then the seat key of the UBHO seat key short connection is fixed by the positioning bolt;

[0012] S4: The swing joint of the guiding tool is fixedly connected with the short connection, the pressure pump is started to test the pressure, during the pressure test, the sliding block is displaced along the inner diameter surface of the upper joint due to the pressure of the pressure pump, the top eave on one side of the sliding block lifts the movable arm, the movable arm drives the swing joint to rotate along the horizontal direction, and the displacement and pump pressure during the rotation of the movable arm are recorded and marked as reference data one;

[0013] S5: The drill pipe string is fixedly connected on the top surface of the UBHO seat key short connection, and then the whole re-entry tool is drilled to the target well bottom;

[0014] S6: The whole re-entry tool is drilled to the distance of 2 meters from the target well window upper portion to the through well drilling bit, the drilling is stopped, and the gyroscope is lowered to the seat key position of the UBHO seat key short connection through the logging cable in the drill pipe string;

[0015] S7: Measure the high edge position of the reentry tool by the gyro, compare the measurement result of the gyro with the sidetracking borehole window azimuth, and adjust the drill pipe string by rotating on the ground so that the azimuth of the guiding tool high edge is consistent with the sidetracking borehole window azimuth;

[0016] S8: Lift the gyro, start the pressurizing pump circulation, and increase the displacement to be greater than the reference data one recorded during the ground pressure test;

[0017] S9: After the displacement reaches a certain data, the guiding tool rotates horizontally according to the principle of S4, so that the through-hole drill bit at the bottom of the guiding tool swings to the borehole window direction, at this time, the drill pipe string is slowly lowered, and the drilling pressure change during each lowering is recorded and marked as reference data two;

[0018] S10: When the reference data two shows a small range of increase, it can be determined that the through-hole drill bit has entered the window, the drill pipe string is slowly lowered, so that the through-hole drill bit enters the sidetracking borehole, thereby performing the through-hole operation of the sidetracking borehole.

[0019] Beneficial effects:

[0020] The reentry method of the wellbore of the ultra-short radius horizontal well provided by the application solves the problem that the through-hole tool does not enter the sidetracking borehole under the action of gravity due to the lack of support points in the vertical well section wellbore. Through the design of the reentry guiding tool and the reasonable construction method, the through-hole and the like pipe string can be smoothly introduced into the sidetracking borehole, the horizontal section fracturing, through-hole and the like purposes are achieved, and the oil production capacity of the borehole is restored and improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the reentry tool of the reentry method of the wellbore of the ultra-short radius horizontal well;

[0022] Figure 2 It is a schematic diagram of the structure of the guiding tool of the reentry method of the wellbore of the ultra-short radius horizontal well;

[0023] Figure 3 It is a schematic diagram of the bending structure of the guiding tool of the reentry method of the wellbore of the ultra-short radius horizontal well;

[0024] Figure 4 It is a schematic diagram of the vertical well entry of the guiding tool of the reentry method of the wellbore of the ultra-short radius horizontal well;

[0025] Figure 5 It is a schematic diagram of the in-well bending of the guiding tool of the reentry method of the wellbore of the ultra-short radius horizontal well;

[0026] Marked in the figure: 1-drill pipe, 2-gyroscope, 3-UBHO seat key short circuit, 4-steering tool, 5-short circuit, 6-through-hole drill bit, 31-upper joint, 32-movable arm, 33-ball joint, 34-oscillating joint, 311-limiting shoulder, 341-limiting clamping groove, 312-pushing groove, 313-sliding block, 314-top eave. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the protection scope of the present application.

[0028] As shown in the figure, the present application discloses a re-entry tool for ultra-short radius horizontal well bore, comprising: drill pipe 1, gyroscope 2, UBHO seat key short circuit 3, steering tool 4, short circuit 5 and through-hole drill bit 6, the top surface of the steering tool 4 is detachably installed with the UBHO seat key short circuit 3, the gyroscope 2 is detachably inserted in the UBHO seat key short circuit 3, and the drill pipe 1 is installed on the top surface of the UBHO seat key short circuit 3; the bottom of the steering tool 4 is detachably installed with the short circuit 5, and the bottom surface of the short circuit 5 is connected with the through-hole drill bit 6; the steering tool 4 is provided with an oscillating part, and the oscillating part can oscillate and deviate in the horizontal direction.

[0029] In the embodiment, the steering tool 4 comprises: upper joint 31, movable arm 32, ball joint 33 and oscillating joint 34, the end of the upper joint 31 is rotationally connected with the oscillating joint 34 through the ball joint 33, a limiting shoulder 311 is fixedly installed at the end of the upper joint 31, a limiting clamping groove 341 is arranged on the top surface of the oscillating joint 34, the limiting shoulder 311 is in the shape of a wedge block, the inner diameter of the limiting clamping groove 341 is greater than that of the limiting shoulder 311, a pushing groove 312 is arranged on the opposite surface of the limiting shoulder 311, the pushing groove 312 cooperates with the movable arm 32, and the movable arm 32 is fixedly installed on the opposite surface of the oscillating joint 34 and is fixedly connected with the oscillating joint 34.

[0030] In the embodiment, a sliding block 313 is slidingly installed in the upper joint 31, the outer diameter of the sliding block 313 cooperates with the inner diameter of the upper joint 31, a top eave 314 is arranged on one side of the sliding block 313, and the top eave 314 cooperates with the notch of the pushing groove 312.

[0031] A re-entry method for ultra-short radius horizontal well bore, comprising the following steps:

[0032] S1: Since the upper joint 31 of the guiding tool 4 is detachably connected with the seat key short connection 3 of the UBHO seat key, the upper joint 31 of the guiding tool 4 is fixedly connected with the seat key of the UBHO seat key short connection 3 and is placed on the workbench;

[0033] S2: The high edge of the guiding tool 4 provided with the UBHO seat key short connection 3 is adjusted to the vertical direction by using the triangular level, so as to ensure that it is perpendicular to the horizontal plane, and a mark is made on the surface of the guiding tool 4;

[0034] S3: The gyroscope 2 is inserted into the UBHO seat key short connection 3, the gyroscope 2 is rotated so that the high edge direction of the gyroscope 2 is consistent with the high edge direction of the guiding tool 4, and then the seat key of the UBHO seat key short connection 3 is fixed by the positioning bolt;

[0035] S4: The swing joint 34 of the guiding tool 4 is fixedly connected with the short connection 5, and the pressure pump is started to test the pressure. During the pressure test, the pressure pump pressurizes the sliding block 313, so that the sliding block 313 is displaced along the inner diameter surface of the upper joint 31, the top eave 314 on one side of the sliding block 313 lifts the movable arm 32, the movable arm 32 drives the swing joint 34 to rotate along the horizontal direction, and the displacement and pump pressure during the rotation of the movable arm 32 are recorded as reference data 1;

[0036] S5: The drill pipe 1 string is fixedly connected on the top surface of the UBHO seat key short connection 3, and then the whole reentry tool is lowered into the target well bottom;

[0037] S6: The whole reentry tool is lowered into the well until the through-hole drill bit 6 is stopped at 2 meters above the target well window, and the gyroscope 2 is lowered into the UBHO seat key short connection 3 seat key position through the logging cable in the drill pipe 1 string;

[0038] S7: The reentry tool high edge position is measured by the gyroscope 2 in the seat key, the measurement result of the gyroscope 2 is compared with the sidetracking window opening direction, and the drill pipe 1 string is rotated and adjusted on the ground so that the high edge direction of the guiding tool 4 is consistent with the sidetracking window opening direction;

[0039] S8: The gyroscope 2 is lifted, the pressure pump is started to circulate the well, and the displacement is increased to be greater than the displacement reference data 1 recorded during the ground pressure test;

[0040] S9: After the displacement reaches a certain data, the guiding tool 4 rotates in the horizontal direction according to the principle of S4, so that the through-hole drill bit 6 at the bottom of the guiding tool 4 swings to the well window opening direction. At this time, the drill pipe 1 string is slowly lowered, and the weight on bit during each lowering is recorded as reference data 2;

[0041] S10: When the reference data II appears a small range of rising, it can be determined that the through-the-hole drill bit 6 has been probed into the window, and the drill pipe 1 string is slowly lowered to make the through-the-hole drill bit 6 enter the lateral hole, thereby performing the through-the-hole operation of the lateral hole.

[0042] Embodiment 1

[0043] Firstly, the re-entry tool is generally composed of the drill pipe 1, the through-the-hole drill bit 6 and the guide tool 4, and the core component is the guide tool 4. The upper joint 31 and the swing joint 34 of the guide tool 4 are rotationally connected by the ball joint 33, and the upper joint 31 and the swing joint 34 can rotate relative to each other by a certain angle. The rotation angle is determined by the limiting shoulder 311 installed at the end of the upper joint 31 and the limiting clamping groove 341. The bottom of the limiting shoulder 311 is provided in the shape of an inclined wedge, and the inner diameter of the limiting clamping groove 341 at the end of the swing joint 34 is a horizontal slot. When the limiting shoulder 311 is rotated to a certain angle, the inclined wedge is matched with the inner diameter of the limiting clamping groove 341, at which time the limiting clamping groove 341 limits and locks the limiting shoulder 311, preventing it from continuing to rotate.

[0044] The rotation power source between the upper joint 31 and the swing joint 34 comes from the sliding block 313. Since the sliding block 313 is interactively embedded in the upper joint 31, the upper joint 31 is pressurized, and the sliding block 313 will slide along the inner diameter surface of the upper joint 31 after being subjected to pressure. When the sliding block 313 slides to the push groove 312, the top eave 314 of the sliding block 313 is exposed to the push groove 312 and lifts the swing joint 34, thereby giving the swing joint 34 a horizontal pressure, so that the swing joint 34 rotates relative to the upper joint 31 in the horizontal direction by means of the ball joint 33.

[0045] When the fluid passes through the re-entry tool at a certain displacement and pressure, the re-entry tool is bent under the action of the guide tool 4, the maximum swing angle can reach 15°, and the effective swing suspended load below can reach 200 kg. Combined with the length of the short connection 5 installed at the bottom of the guide tool 4, a fulcrum can be effectively formed in the wellbore to realize the suspended lateral entry.

[0046] From the construction method, the swingability of the guide tool 4 is utilized, the gyroscope 2 is deeply inserted into the drill pipe 1 string, and is in the UBHO seat key short connection 5. Since the pressure test is performed on the ground, the gyroscope 2 records the high edge position information of the guide tool 4 measured by the gyroscope 2 in the initial vertical state of the guide tool 4, and then measures the high edge position information of the guide tool 4 after being deeply inserted into the wellbore, so as to accurately determine the position where the guide tool 4 is bent by comparing the two.

[0047] Due to the increase of the WOB in the drill pipe 1 string, the slider 313 is displaced, so that the steering tool 4 is bent, and the change of the WOB in the following process is used as a basis for determining the relative position of the window of the lateral wellbore and the progress of the through-hole.

[0048] The application provides a re-entry method of an ultra-short radius horizontal well bore, which solves the problem that a through-hole tool cannot enter a lateral wellbore under the action of gravity due to the lack of a support point in a vertical well bore by designing a well bore re-entry steering tool 4. Through the design of the re-entry steering tool 4 and a reasonable construction method, the through-hole and the like string can enter the lateral wellbore smoothly, the purposes of fracturing, through-hole deblocking and the like of the horizontal section are achieved, and the oil output capacity of the well bore is restored and improved.

[0049] The above merely describes the preferred embodiments of the application, and is not used to limit the application, and any modification, equivalent replacement, improvement and the like within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A reentry method for an ultra-short radius horizontal wellbore, characterized by: The method needs to use a reentry tool of an ultra-short radius horizontal well bore, which comprises a drill pipe (1), a gyroscope (2), a UBHO seat key sub (3), a guide tool (4), a sub (5) and a through-hole drill bit (6), the top surface of the guide tool (4) is detachably installed with the UBHO seat key sub (3), the gyroscope (2) is detachably inserted into the UBHO seat key sub (3), and the drill pipe (1) is installed on the top surface of the UBHO seat key sub (3); the bottom of the guide tool (4) is detachably installed with the sub (5), and the bottom surface of the sub (5) is connected with the through-hole drill bit (6); the guide tool (4) is provided with a swing part which can swing and deviate in the horizontal direction; The guide tool (4) comprises an upper joint (31), a movable arm (32), a ball joint (33) and a swing joint (34), the end of the upper joint (31) is rotationally connected with the swing joint (34) through the ball joint (33), a limiting shoulder (311) is fixedly installed at the end of the upper joint (31), a limiting clamping groove (341) is arranged on the top surface of the swing joint (34), the limiting shoulder (311) is in the shape of a wedge block, the inner diameter of the limiting clamping groove (341) is greater than that of the limiting shoulder (311), a pushing groove (312) is arranged on the opposite surface of the limiting shoulder (311), and the pushing groove (312) is matched with the movable arm (32), the movable arm (32) is fixedly installed on the opposite surface of the swing joint (34) and is fixedly connected with the swing joint (34); A sliding block (313) is slidably installed in the upper joint (31), the outer diameter of the sliding block (313) is matched with the inner diameter of the upper joint (31), and a top eave (314) is arranged on one side of the sliding block (313) and matched with the notch of the pushing groove (312); The method specifically comprises the following steps: S1: Since the UBHO seat key sub (3) is detachably connected with the upper joint (31) of the guide tool (4), the upper joint (31) of the guide tool (4) is fixedly connected with the seat key of the UBHO seat key sub (3) and is placed flat on a workbench; S2: The high edge of the guide tool (4) provided with the UBHO seat key sub (3) is adjusted to the vertical direction by using a triangular level, so as to ensure that it is perpendicular to the horizontal plane, and a mark is made on the surface of the guide tool (4); S3: The gyroscope (2) is inserted into the UBHO seat key sub (3), the gyroscope (2) is rotated, the high edge direction of the gyroscope (2) is made consistent with the high edge direction of the guide tool (4), and then the seat key of the UBHO seat key sub (3) is fixed by positioning bolts. S4: the swing joint (34) of the guide tool (4) is fixedly connected with the short circuit (5), the pressure pump is opened for pressure test, during the pressure test, the slide block (313) is displaced along the inner diameter surface of the upper joint (31) because the pressure pump pressurizes the slide block (313), the top eave (314) on one side of the slide block (313) lifts the movable arm (32), the movable arm (32) drives the swing joint (34) to rotate in the horizontal direction, and the displacement and pump pressure when the movable arm (32) rotates are recorded as reference data one; S5: the drill pipe (1) string is fixedly connected with the top surface of the UBHO seat key short circuit (3), and then the whole reentry tool is lowered into the target well bottom; S6: the whole reentry tool is lowered into the well until the distance between the through-drilling bit (6) and the upper part of the target window is 2 meters, and the gyro (2) is lowered into the UBHO seat key short circuit (3) seat key position through the logging cable in the drill pipe (1) string; S7: the gyro (2) measures the high edge position of the reentry tool, compares the measurement result of the gyro (2) with the sidetracking window opening direction, and rotates and adjusts the drill pipe (1) string on the ground so that the high edge direction of the guide tool (4) is consistent with the sidetracking window opening direction; S8: the gyro (2) is lifted, the pressure pump is opened for circulation washing, and the displacement is increased to be greater than the reference data one recorded during the ground pressure test; S9: after the displacement reaches a certain data, the guide tool (4) rotates in the horizontal direction according to the principle of S4, so that the through-drilling bit (6) at the bottom of the guide tool (4) swings to the sidetracking window opening direction, at this time, the drill pipe (1) string is slowly lowered, and the weight on bit (WOB) change during each lowering is recorded as reference data two; S10: when the reference data two shows a small range of increase, it can be determined that the through-drilling bit (6) has entered the window, the drill pipe (1) string is slowly lowered, so that the through-drilling bit (6) enters the sidetracking well, thereby the through-drilling operation of the sidetracking well is performed.

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