Coiled tubing weight lifting device and coiled tubing drill and mill tool string

Abstract

The present application relates to the technical fields of oil engineering downhole operation tool, and is a coiled tubing drilling pressure lifting device and coiled tubing drilling and grinding tool string, which comprises a connecting sleeve body, an outer ring platform is formed by extending outward from the outer side of the middle part of the connecting sleeve body, the bottom surface of the outer ring platform is a taper surface with a large upper part and a small lower part, a plurality of jet inclined fine holes are uniformly distributed in the circumferential direction on the connecting sleeve body corresponding to the position below the outer ring platform, the angle between the axis of the jet inclined fine hole and the axis of the connecting sleeve body is equal to the angle between the generatrix of the taper surface on the outer ring platform and the axis of the connecting sleeve body. The present application has a clever structure design, and well treatment fluid is circulated to the bottom of the well through the coiled tubing during the operation process, a high-speed jet is formed at the bottom surface of the outer ring platform of the present application, thereby forming an up-down pressure difference at the outer ring platform, a thrust in the direction of the bottom of the well is formed on the operation tool string, and the problem of difficult drilling pressure application during the coiled tubing drilling and grinding operation process can be well solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole operation tools for petroleum engineering, and is a continuous tubing drilling pressure lifting device and a continuous tubing drilling and grinding tool string. BACKGROUND

[0002] As a new type of operation equipment in the petroleum industry, continuous tubing has been widely used in the fields of flushing operation, drilling and grinding operation, and drilling operation, and plays an increasingly important role in the development of oil and gas fields. However, the continuous tubing is flexible, and compared with the conventional pipe string, its residual bending characteristics and the complex stress environment in the wellbore lead to certain shortcomings in the axial load transmission. The main performance is that the continuous tubing is prone to buckling deformation when the axial load reaches a certain range, especially during the drilling and grinding operation of the horizontal well. The drilling pressure exertion is difficult due to the buckling of the continuous tubing, which seriously restricts the efficiency of the continuous tubing drilling and grinding operation. At present, the metal drag-reducing agent can be added to the workover fluid, and the hydraulic oscillator, jar and the like can be introduced into the operation tool string to improve the continuous tubing running depth, so as to realize the drilling pressure exertion at the same depth. However, these measures have the following problems: 1. The cost of the metal drag-reducing agent is high, and it is difficult to be widely used; 2. The downhole efficiency-improving tools such as hydraulic oscillator and jar have complex structure and poor reliability. SUMMARY

[0003] The present application provides a continuous tubing drilling pressure lifting device and a continuous tubing drilling and grinding tool string, which overcomes the shortcomings of the prior art and effectively solves the problem of difficult drilling pressure exertion in the existing continuous tubing operation.

[0004] One of the technical solutions of the present application is achieved by the following measures: a continuous tubing drilling pressure lifting device, comprising a connecting sleeve, an inner thread is arranged on the upper inner side of the connecting sleeve, an outer thread is arranged on the lower outer side of the connecting sleeve, an outer ring platform is formed by extending the outer side of the middle part of the connecting sleeve outward, the bottom surface of the outer ring platform is a large-to-small taper surface, the top surface of the outer ring platform is a ring-shaped horizontal surface, a plurality of jet inclined holes inclined outward from bottom to top are uniformly distributed along the circumferential direction of the connecting sleeve corresponding to the position below the outer ring platform, the included angle between the axis of the jet inclined hole and the axis of the connecting sleeve is equal to the included angle between the generatrix of the taper surface of the outer ring platform and the axis of the connecting sleeve, and the outer end outlet of the jet inclined hole is close to the bottom surface of the outer ring platform.

[0005] The following is a further optimization or / and improvement of the above-mentioned technical solutions of the application:

[0006] The included angle between the generatrix of the taper surface and the axis of the connecting sleeve can be 20 to 75 degrees.

[0007] The included angle between the generatrix of the taper surface and the axis of the connecting sleeve can be 30 degrees.

[0008] The distance between the outer end of the jet oblique fine hole and the bottom surface of the outer ring platform can be 0-5 cm.

[0009] The outer side surface of the outer ring platform can be a circumferential surface; a chamfer is arranged at the junction between the top surface of the outer ring platform and the outer side surface of the outer ring platform.

[0010] The second technical scheme of the present application is realized by the following measures: a coiled tubing drilling and grinding tool string, comprising a coiled tubing drilling and pressing lifting device, a sleeve, a coiled tubing connector, a motor head assembly, a screw motor and a drill bit, the coiled tubing connector is installed in the sleeve, the motor head assembly is installed at the lower end of the coiled tubing connector, the lower end outer side of the motor head assembly and the upper inner side of a connecting sleeve body are fixedly connected together, the lower outer side of the connecting sleeve body and the upper inner side of the screw motor are fixedly connected together, and the lower end of the screw motor and the drill bit are fixedly connected together.

[0011] The present application has a clever structure design, and during operation, the workover fluid is circulated to the bottom of the well through the coiled tubing, a high-speed jet is formed at the bottom surface of the outer ring platform of the present application, according to Bernoulli's principle, a negative pressure area is formed in this area, under the action of the pressure difference between the upper and lower sides, a thrust in the direction of the well bottom is formed on the operation tool string, the purpose of increasing the effective drilling pressure is achieved, the whole device has a simple structure, low manufacturing cost and strong applicability, and can well solve the problem of difficult drilling pressure application during the coiled tubing drilling and grinding operation, can increase the coiled tubing drilling pressure by more than 15%, and correspondingly increase the coiled tubing horizontal section by more than 15%. BRIEF DESCRIPTION OF DRAWINGS

[0012] FIG. 1 is a schematic diagram of the front view of the structure of the present application. Figure 1 FIG. 1 is a schematic diagram of the front view of the structure of the present application.

[0013] FIG. 2 is a schematic diagram of the front view of the structure of the present application used in the coiled tubing operation. Figure 2 FIG. 2 is a schematic diagram of the front view of the structure of the present application used in the coiled tubing operation.

[0014] FIG. 3 is a schematic diagram of the fluid flow direction of the present application used in the coiled tubing operation. Figure 3 FIG. 3 is a schematic diagram of the fluid flow direction of the present application used in the coiled tubing operation.

[0015] FIG. 4 is a schematic diagram of the parameter marking of the present application used in the coiled tubing operation. Figure 4 FIG. 4 is a schematic diagram of the parameter marking of the present application used in the coiled tubing operation.

[0016] FIG. 5 is a schematic diagram of the front view of the structure of the second embodiment of the present application. Figure 5 FIG. 5 is a schematic diagram of the front view of the structure of the second embodiment of the present application.

[0017] The codes in the attached diagram are as follows: 1 is the connecting sleeve, 2 is the outer ring platform, 3 is the conical surface, 4 is the annular horizontal surface, 5 is the jet oblique fine hole, 6 is the circumferential surface, 7 is the chamfer, 8 is the casing, 9 is the continuous tubing connector, 10 is the motor head assembly, 11 is the screw motor, 12 is the drill bit, and 13 is the drill bit. Detailed Implementation

[0018] The present invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of the present invention.

[0019] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0021] Example 1: As shown in the attached document Figures 1-4 As shown, the coiled tubing drilling pressure lifting device includes a connecting sleeve 1. The upper inner side of the connecting sleeve 1 is provided with an internal thread, and the lower outer side of the connecting sleeve 1 is provided with an external thread. The middle outer side of the connecting sleeve 1 extends outward to form an outer ring platform 2. The bottom surface of the outer ring platform 2 is a conical surface 3 that is larger at the top and smaller at the bottom. The top surface of the outer ring platform 2 is an annular horizontal surface 4. A number of jet oblique fine holes 5 are evenly distributed along the circumferential direction on the connecting sleeve 1 corresponding to the position below the outer ring platform 2. The angle between the axis of the jet oblique fine hole 5 and the axis of the connecting sleeve 1 is equal to the angle between the generatrix of the conical surface 3 on the outer ring platform 2 and the axis of the connecting sleeve 1. The outer end outlet of the jet oblique fine hole 5 is close to the bottom surface of the outer ring platform 2. In use, this invention is used in conjunction with a coiled tubing tool string, which includes a casing 8, a coiled tubing connector 9, a motor head assembly 10, a screw motor 11, and a drill bit 12. The coiled tubing connector 9, motor head assembly 10, screw motor 11, and drill bit 12 are connected together from top to bottom and installed inside the casing 8. The connecting sleeve 1 is connected between the motor head assembly 10 and the screw motor 11 via internal and external threads at the top and bottom. During the drilling operation on the drill bit 13, fluid is pumped into the tool string from the coiled tubing by a surface pumping device. A schematic diagram of the fluid flow direction in this invention is attached. Figure 3As shown, under the action of the bit 12 water hole and the screw motor 11 throttle, part of the fluid flows from the connecting sleeve 1 to the annular area between the connecting sleeve 1 and the inner wall of the sleeve 8 through the jet inclined hole 5. Since the angle between the axis of the jet inclined hole 5 and the axis of the connecting sleeve 1 is equal to the angle between the generatrix of the conical surface 3 on the outer ring shoulder 2 and the axis of the connecting sleeve 1 and the aperture of the jet inclined hole 5 is smaller, a high-speed jet is formed on the area near the bottom surface of the outer ring shoulder 2. Since the jet inclined hole 5 is uniformly distributed in the circumferential direction, according to the Bernoulli principle of fluid mechanics, a local negative pressure area is formed near the bottom surface of the outer ring shoulder 2, as shown in the figure. Figure 3 As shown, the pressure of the bottom surface area of the outer ring shoulder 2 is P2, and the pressure of the top surface area of the outer ring shoulder 2 is P1. A stable pressure difference ΔP (ΔP = P1-P2) is formed on the outer ring shoulder 2 during operation, and the size of the axial force can be represented in combination with the tool structure parameters:

[0022]

[0023] During operation, the ground pump injection is a continuous process, and another part of the fluid in the drill string continues to flow downward through the screw motor 11 and the bit 12, and returns to the ground through the annulus. During this process, P1>P2.

[0024] Suppose the ground pump injection displacement during operation is Q, and the discharge from the jet hole of the present application is Q0. The fluid characteristics of the entire tool string area are analyzed. During annular flow, due to the influence of the outer diameter of the present application, a throttling pressure reduction effect upward is generated, which will weaken the pressure amplitude of the negative pressure area formed due to the high-speed jet. Therefore, the influence on the effect of lifting the drilling pressure needs to be considered, and the following calculation is performed:

[0025] (1) The negative pressure value P0 generated by the high-speed jet of the jet hole of the present application jet :

[0026]

[0027] (2) The reverse throttling pressure difference P2 generated by the annular fluid throttling c :

[0028]

[0029] (3) The real stable pressure difference ΔP formed during operation:

[0030]

[0031] (4) The additional drilling pressure value ΔF increased during operation:

[0032]

[0033] In the above formula, each parameter has the following meaning:

[0034] D - the maximum outer diameter of the outer ring shoulder 2, m;

[0035] D c - the inner diameter of the sleeve 8, m;

[0036] n - the number of jet inclined holes 5, pieces;

[0037] d - the diameter of the jet inclined hole 5, m;

[0038] d0 - the outer diameter of the connecting sleeve 1 at the upper part of the outer ring shoulder 2, m;

[0039] d1 - the outer diameter of the connecting sleeve 1 at the lower part of the outer ring shoulder 2, m;

[0040] ρ - the density of the pumped fluid, kg / m 3 ;

[0041] Q0 - the flow rate of the jet inclined hole 5 during the operation process, m 3 / s;

[0042] Q - the ground pump injection flow rate during the operation process, m 3 / s;

[0043] △P - the real pressure difference between the upper and lower parts of the outer ring shoulder 2 during the operation process, Pa;

[0044] △F - the additional drilling pressure applied by the present application during the operation process, N.

[0045] Thus, during the coiled tubing drilling and grinding operation, the present application can provide the drill bit 12 with an additional drilling pressure value △F, which is closely related to the above-mentioned parameters. During the determination of the specific parameters of the tool, the actual drilling and grinding operation well parameters need to be optimized to achieve the best effect.

[0046] The application forms a high-speed jet flow at the bottom surface of the outer ring platform 2 through the structure design, and according to Bernoulli's principle, a negative pressure area is formed in the area, and under the action of the pressure difference between the upper and lower pressures, a thrust in the direction of the well bottom is formed on the operation tool string, so that the purpose of increasing the effective drilling pressure is achieved. The whole device has simple structure and strong applicability, can increase the drilling pressure of the coiled tubing by more than 15%, and correspondingly increase the horizontal section of the coiled tubing by more than 15%, realize the engineering purpose of improving the drilling pressure value and the maximum depth of the coiled tubing, compared with the way of adding metal resistance reducing agent in the workover fluid or introducing a hydraulic oscillator, a jar and the like in the operation tool string to improve the effective drilling pressure or the depth of the coiled tubing, the device has simple structure, low manufacturing cost and strong applicability, can well solve the problem of difficult drilling pressure application in the coiled tubing drilling and milling operation, and can improve the effective depth of the coiled tubing to a certain extent, which lays a solid foundation for the coiled tubing operation of the ultra-deep well and the ultra-long horizontal section horizontal well, and plays an important role.

[0047] According to actual needs, the coiled tubing drilling pressure lifting device can be further optimized or / and improved:

[0048] Preferably, the included angle between the generatrix of the conical surface 3 and the axis of the connecting sleeve body 1 is 20 degrees to 75 degrees. In this embodiment, the included angle between the generatrix of the conical surface 3 and the axis of the connecting sleeve body 1 is 30 degrees.

[0049] Preferably, the distance between the outer end outlet of the jet oblique hole 5 and the bottom surface of the outer ring platform 2 is 0 cm to 5 cm. In this embodiment, the distance between the outer end outlet of the jet oblique hole 5 and the bottom surface of the outer ring platform 2 is 2 cm.

[0050] Preferably, the outer side surface of the outer ring platform 2 is a circumferential surface, and a chamfer is arranged at the junction of the top surface of the outer ring platform 2 and the outer side surface of the outer ring platform 2. By arranging the chamfer, the application can be prevented from being stuck when moving and abutting against other components.

[0051] Embodiment two: as Figure 5As shown, a coiled tubing drilling and grinding tool string comprises a coiled tubing drilling and pressing lifting device, a sleeve 8, a coiled tubing connector 9, a motor head assembly 10, a screw motor 11 and a drill bit 12, the coiled tubing connector 9 is installed in the sleeve 8, the motor head assembly 10 is installed at the lower end of the coiled tubing connector 9, the outer side of the lower end of the motor head assembly 10 and the inner side of the upper part of the connecting sleeve body 1 are fixedly connected together, the outer side of the lower part of the connecting sleeve body 1 and the inner side of the upper end of the screw motor 11 are fixedly connected together, and the lower end of the screw motor 11 and the drill bit 12 are fixedly connected together. Thus, during operation, the workover fluid is circulated to the bottom of the well through the coiled tubing, a high-speed jet is formed at the bottom surface of the outer ring platform 2 of the present application, according to Bernoulli's principle, a negative pressure area is formed in this area, under the action of the pressure difference between the upper and lower parts, a thrust in the direction of the bottom of the well is formed on the operation tool string, the purpose of increasing the effective drilling pressure is achieved, the whole device has simple structure and strong applicability, the coiled tubing can be applied to increase the drilling pressure by more than 15%, the corresponding increase in the coiled tubing horizontal section is more than 15%, the engineering purpose of increasing the drilling pressure value and the maximum running depth of the coiled tubing is achieved, compared with the way of adding metal resistance reducing agent in the workover fluid or introducing a hydraulic oscillator, a jar and the like in the operation tool string to increase the effective drilling pressure or the running depth of the coiled tubing, the device of the present application has simple structure, low manufacturing cost and strong applicability, can well solve the problem of difficulty in applying drilling pressure during the coiled tubing drilling and grinding operation, and can improve the effective running depth of the coiled tubing to a certain extent, will lay a solid foundation for the coiled tubing operation of super-deep wells and super-long horizontal section horizontal wells, and play an important role.

[0052] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A coiled tubing weight on bit lifting device characterized by The connecting sleeve body is internally threaded at the upper inner side, externally threaded at the lower outer side, and has an outer ring platform extending outwardly at the middle outer side, the bottom surface of the outer ring platform is a tapered surface with a large upper part and a small lower part, the top surface of the outer ring platform is a ring-shaped horizontal surface, a plurality of jet inclined holes inclined outwardly from bottom to top are distributed along the circumference of the connecting sleeve body at a position below the outer ring platform, the angle between the axis of the jet inclined hole and the axis of the connecting sleeve body is equal to the angle between the generatrix of the tapered surface and the axis of the connecting sleeve body, and the outer end outlet of the jet inclined hole is close to the bottom surface of the outer ring platform.

2. The coiled tubing weight on bit lifting device of claim 1, wherein The angle between the generatrix of the tapered surface and the axis of the connecting sleeve body is 20-75 degrees.

3. The coiled tubing weight on bit lifting device of claim 1 or 2, wherein The outer side surface of the outer ring platform is a circumferential surface, and a chamfer is arranged at the junction of the top surface of the outer ring platform and the outer side surface of the outer ring platform.

4. A coiled tubing drill grinding tool string using the coiled tubing WOB lifting device according to any one of claims 1-3, comprising the coiled tubing WOB lifting device, a casing, a coiled tubing connector, a motor head assembly, a screw motor and a drill bit, the coiled tubing connector is installed in the casing, the motor head assembly is installed at the lower end of the coiled tubing connector, the lower end outer side of the motor head assembly and the upper inner side of the connecting sleeve body are fixedly connected together, the lower outer side of the connecting sleeve body and the upper inner side of the screw motor are fixedly connected together, and the lower end of the screw motor and the drill bit are fixedly connected together.

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