Continuous angle-increasing shape-preserving coring drilling tool for petroleum drilling

Abstract

The utility model belongs to the field of drilling and coring, and relates to a continuous angle-increasing shape-preserving coring drilling tool for petroleum drilling, which is suitable for continuous shape-preserving coring of highly-deviated well sections and comprises an outer barrel and an inner barrel. A coring drill bit is installed at the tail end of the outer cylinder, a turning plate type check valve and a drill rod are installed at the top end of the outer cylinder from bottom to top, a stabilizer is installed on a cylinder body of the outer cylinder, and the stabilizer is close to the coring drill bit. And a hanging bearing, a centralizing short section and a core catcher seat are sequentially mounted on a barrel body of the inner barrel from top to bottom. Compared with a conventional coring drilling tool, the coring drilling tool has the advantages that an upper stabilizer of an outer cylinder is removed, and accurate control over the hole drift angle in the coring process of a high-inclination section can be achieved only by adjusting the lower stabilizer, namely the size of the stabilizer in the coring drilling tool; a roller bearing at the tail end of the inner cylinder is removed and replaced by the centralizing short section, so that the radial adjustment space is enlarged, and core entering is easier in the angle-increasing coring drilling process; and a turning plate type check valve is adopted, so that the coring yield and the well control safety can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of drilling coring, in particular to a continuously deflection-increasing shape-preserving coring drill tool for oil drilling. Background Art

[0002] At present, coring technology is mainly divided into conventional coring and horizontal well coring.

[0003] Conventional coring techniques are suitable for vertical wells and small-displacement directional wells. The inclination angle during the coring operation is generally less than 10°. Conventional coring tools are used, and the inclination angle is not controlled during the coring operation. The coring drill string assembly consists of: Ø215mm coring drill bit × 0.32m + Ø178mm core barrel × 30m + Ø178mm safety joint × 0.65m + Ø178mm check valve + Ø127mm heavy-weight drill pipe + Ø127mm drill pipe.

[0004] The horizontal well coring process is suitable for stable-inclination coring in the horizontal section of a horizontal well with a well inclination of 90°, or stable-inclination coring in the highly deviated section of a highly deviated well with a well inclination of 85-87°. It uses special coring tools for horizontal wells, and the coring drill string assembly is: Ø215mm coring drill bit × 0.32m + Ø212mm lower stabilizer × 1m + Ø178mm core barrel × 8m + Ø212mm upper stabilizer × 1m + Ø178mm safety joint × 0.65m + Ø178mm check valve + Ø127mm heavy-weight drill pipe + Ø127mm drill pipe.

[0005] However, conventional coring techniques do not require inclination control during coring operations. In horizontal sections of horizontal wells and in highly deviated sections of highly deviated wells, coring is performed with a steady-state inclination. When inclination control is required, screw drills are used to ream holes, measure inclination, adjust inclination, and control the trajectory. Continuous coring in highly deviated sections, in particular, requires the use of a coring tool with "auto-incremental" inclination, but there is limited experience in controlling the inclination increment to zero.

[0006] A search for similar patents revealed publication number CN207863913U, titled "A Drilling Coring Assembly Tool." The invention discloses a drilling coring assembly tool consisting of a coring bit, a centralizer, a core barrel, a replacement joint, and a water diversion joint. The core barrel, centralizer, and replacement joint have connecting threads at both ends, allowing for threaded connections. Three combined structures are created by connecting the centralizer, replacement joint, core barrel, and water diversion joint in different sequences, respectively achieving the goals of increasing, decreasing, and stabilizing the wellbore trajectory, thereby meeting on-site requirements for controlling the wellbore trajectory of horizontal and directional wells. However, the specific inclination-increasing technology is not clearly described, and there is no quantitative reference for the coring inclination-increasing rate. Utility Model Content

[0007] The utility model aims to provide a continuously deflection-increasing and shape-preserving coring drill tool for oil drilling, so as to overcome the above technical defects.

[0008] In order to solve the above technical problems, the utility model provides a continuous inclination-increasing shape-preserving coring drill tool for oil drilling, which is suitable for continuous shape-preserving coring in highly deviated well sections, including:

[0009] An outer cylinder, a core drill bit is installed at the end of the outer cylinder, a flap check valve and a drill rod are installed from bottom to top on the top of the outer cylinder, and a stabilizer is installed on the cylinder body of the outer cylinder, and the stabilizer is close to the core drill bit;

[0010] An inner cylinder, wherein the cylinder body of the inner cylinder is sequentially installed with a suspension bearing, a straightening sub and a core claw seat from top to bottom;

[0011] The suspension bearing is sleeved on the upper end of the inner tube to suspend the inner tube in the outer tube, and the core claw seat is suitable for installing a core claw to cooperate with the coring drill bit to cut the core after breaking the formation.

[0012] According to the oil drilling continuous inclination and shape-keeping coring drill tool, the stabilizer adopts a micro-drop stabilizer with a specification of Ø186mm, so that the oil drilling continuous inclination and shape-keeping coring drill tool is suitable for micro-drop coring in highly deviated well sections.

[0013] According to the oil drilling continuous inclination increasing and shape-preserving coring drill tool, the stabilizer adopts a stable inclination stabilizer with a specification of Ø196mm or Ø202mm, so that the oil drilling continuous inclination increasing and shape-preserving coring drill tool is suitable for stable inclination coring in highly deviated well sections.

[0014] According to the oil drilling continuous inclination and shape-keeping coring drill tool, the stabilizer adopts a micro-increase stabilizer with a specification of Ø206mm or Ø209mm, so that the oil drilling continuous inclination and shape-keeping coring drill tool is suitable for micro-increase coring in highly deviated well sections.

[0015] According to the oil drilling continuous inclination-increasing shape-preserving coring drill tool, the stabilizer adopts an inclination-increasing stabilizer with a specification of Ø212mm, so that the oil drilling continuous inclination-increasing shape-preserving coring drill tool is suitable for inclination-increasing coring in highly deviated well sections.

[0016] According to the oil drilling continuous inclination and conformal coring drill tool, a differential nipple and a safety joint are connected between the outer cylinder and the flap-type check valve;

[0017] Wherein, the safety joint is adjacent to the flap-type check valve.

[0018] According to the oil drilling continuous inclination and shape-preserving coring drill tool, a weighted drill rod is connected between the drill rod and the flap-type check valve.

[0019] The utility model provides a continuous inclination and conformal coring drill tool for oil drilling, suitable for continuous conformal coring in highly deviated well sections. Compared to conventional coring drill tools, this tool eliminates the upper stabilizer from the outer barrel. By simply adjusting the size of the lower stabilizer (the stabilizer in the utility model), precise control of the well inclination angle can be achieved during coring in highly deviated sections. The tool also eliminates the roller bearing at the end of the inner barrel and replaces it with a straightening sub, increasing radial adjustment space and making it easier to core during inclination coring. The use of a flap-type check valve ensures both coring yield and well control safety.

[0020] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a continuously increasing inclination and shape-preserving coring drill tool for oil drilling.

[0022] Description of reference numerals:

[0023] 10. Drill pipe; 20. Flap check valve; 30. Outer cylinder; 40. Stabilizer; 50. Coring drill bit. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] It should be noted that, in the present invention, the upper, lower, left and right in the figure are regarded as the upper, lower, left and right of the oil drilling continuous inclination and shape-preserving coring drill tool described in this specification.

[0026] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a detailed and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0027] Unless otherwise specified, the terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have meanings consistent with the context of their relevant fields and should not be interpreted as idealized or overly formal.

[0028] This embodiment relates to a continuous conformal coring drill tool for oil drilling, which is suitable for continuous conformal coring in highly deviated well sections. It is particularly suitable for hydraulic fracturing test site construction projects and meets the special process requirements of continuous conformal coring and increasing deflection in highly deviated well sections of 8.5-inch wellbores.

[0029] The above-mentioned high-angle well section refers to a well section with an inclination of 70 to 85 degrees.

[0030] The oil drilling continuous deflection-increasing shape-preserving coring drill tool comprises an outer cylinder 30 and an inner cylinder.

[0031] See also Figure 1 A core drill bit 50 is installed at the end of the outer tube 30, a flap check valve 20 and a drill rod 10 are installed from bottom to top at the top of the outer tube 30, and a stabilizer 40 is installed on the barrel of the outer tube 30, and the stabilizer 40 is close to the core drill bit 50.

[0032] Compared with conventional coring drills, this embodiment removes the upper stabilizer of the outer cylinder 30, and only needs to adjust the lower stabilizer (i.e. Figure 1 By adjusting the size of the stabilizer 40 in the wellbore, it is possible to achieve precise control of the well inclination during coring in high-angle sections, solving the problem of being unable to increase the well inclination during coring operations.

[0033] Please continue reading Figure 1 Compared with conventional coring drill tools, this embodiment adopts a flap-type check valve 20. Under the premise of ensuring well control safety, it does not affect the technical requirements of changing the drilling fluid circulation channel after the inner barrel is flushed before coring, thereby ensuring the coring recovery rate and solving the problem that the coring recovery rate cannot be guaranteed in coring operations in high-angle well sections.

[0034] The inner cylinder body is sequentially installed with a suspension bearing, a straightening pup joint and a core claw seat from top to bottom, wherein the suspension bearing is sleeved on the upper end of the inner cylinder to suspend the inner cylinder in the outer cylinder 30, and the core claw seat is suitable for installing a core claw to cooperate with the coring drill bit 50 to cut the core after breaking the formation.

[0035] Compared with conventional coring tools, this embodiment also removes the roller bearing at the end of the inner barrel and replaces it with a straightening short section, which increases the radial adjustment space and makes it easier to enter the core during the inclined coring process. Specifically:

[0036] In existing coring drill bits, the roller bearings are located within the drill bit, and the inner barrel, bearings, and drill bit inner wall fit tightly and perfectly centered. However, due to trajectory variations during incremental coring, the core, wellbore, and drill bit are not perfectly centered, resulting in a certain degree of deviation. This can damage the core claws when the incremental drill enters the core, leading to coring failure. Replacing the sub with a straightening sub increases the distance between the straightening wheel and the drill bit to 0.6 meters. The gap between the straightening wheel and the inner barrel is enlarged at the end of the inner barrel (inside the coring drill bit), increasing the radial swing space of the inner barrel end within the drill bit. This makes it more suitable for incremental coring operations, where the core, wellbore, and drill bit are not perfectly centered, making it easier to enter the core during incremental coring.

[0037] In some embodiments, a differential nipple and a safety joint are connected between the outer cylinder 30 and the flap-type check valve 20 ; wherein the safety joint is adjacent to the flap-type check valve 20 .

[0038] In some embodiments, a weighted drill pipe is connected between the drill pipe 10 and the flap check valve 20 .

[0039] To achieve precise control of the well inclination angle during coring in highly deviated well sections, in this embodiment, the stabilizer 40 can be of different sizes, including but not limited to a micro-drop stabilizer with a specification of Ø186mm, so that the oil drilling continuous inclination and conformal coring drill tool is suitable for micro-drop coring in highly deviated well sections. Alternatively, the stabilizer 40 can be a deflection-stabilizing stabilizer with a specification of Ø196mm or Ø202mm, so that the oil drilling continuous inclination and conformal coring drill tool is suitable for stable inclination coring in highly deviated well sections. Alternatively, the stabilizer 40 can be a micro-increase stabilizer with a specification of Ø206mm or Ø209mm, so that the oil drilling continuous inclination and conformal coring drill tool is suitable for micro-increase coring in highly deviated well sections. Alternatively, the stabilizer 40 can be a deflection-increase stabilizer with a specification of Ø212mm, so that the oil drilling continuous inclination and conformal coring drill tool is suitable for deflection-increase coring in highly deviated well sections.

[0040] The use process of the continuous inclination-increasing conformal coring tool for oil drilling is as follows:

[0041] S001.Coring tool preparation

[0042] ① Fabricate stabilizers 40 with varying outer diameters, including: slightly lowered (Ø186mm), stabilized (Ø196mm, Ø202mm), slightly increased (Ø206mm, Ø209mm), and increased (Ø212mm). ② Remove the roller bearing at the end of the inner barrel and replace it with a centering sub near the drill bit. ③ Prepare the core drill bit 50 and flap check valve 20.

[0043] S002. Before coring operation

[0044] Use 8.5" coring drill bit 50 to drill to the coring depth, and verify the stability of the wellbore by short tripping. According to the technical plan, the drilling fluid performance is adjusted and fully circulated to circulate the sand in the wellbore cleanly.

[0045] S003.Coring operation

[0046] Step 1: Based on the design requirements for the slope increase rate during the coring section, a 40-mm stabilizer was selected. The first run used a Ø212mm stabilizer and a coring tool, and coring was performed. A single coring run achieved 9 meters. A Ø209mm micro-stabilizer was used for the second run, and a Ø212mm stabilizer was used for the third run. The overall slope increase rate was adjusted. After three consecutive coring runs, achieving 29 meters of footage, a near-bit gamma-ray inclinometer was deployed to measure inclination and ream the wellbore to repair the wellbore wall.

[0047] Step 2: Based on the actual slope increase rate measured during the coring process and compared with the design requirements, the coring combination is adjusted again, and the optimization is performed by referring to the slope increase and decrease conditions of each size stability, 40.

[0048] Repeat the first and second steps until the coring operation is completed.

[0049] According to the above-mentioned steps for using the continuous inclination-increasing conformal coring drill tool for oil drilling, this embodiment applies the continuous inclination-increasing conformal coring drill tool to the X-1 well. The designed well depth is 2145 m, the target layer is the extended group length 71, and the designed continuous conformal coring of the three hydraulic fracture layers is 300 m. The well inclination increases from 76° to 84.6°, and the designed coring operation increase rate is 0.94° / 30 m.

[0050] For Well X-1, the steps for continuous conformal coring and deflection increase using the oil drilling continuous conformal coring drill tool are as follows:

[0051] (1) Preparation of coring tools

[0052] Manufacture stabilizers 40 with varying outer diameters, including slightly lowered (Ø186mm), stabilized (Ø196mm, Ø202mm), slightly increased (Ø206mm, Ø209mm), and increased (Ø212mm). Remove the roller bearing at the end of the inner barrel and replace it with a centering sub near the drill bit. Prepare a core drill bit and flap check valve.

[0053] (2) Before coring

[0054] An 8.5" drill bit was used to drill to a depth of 1,846 m. ​​A short trip was performed to verify wellbore stability. According to the technical plan, the drilling fluid properties were adjusted and fully circulated to remove the sand from the wellbore.

[0055] (3) Coring operation

[0056] Step 1: Use oil drilling continuous inclination-increasing conformal coring drill tools, select Ø212mm stabilizer 40 for coring operation, and perform single coring with a footage of 9m. After coring for 3 times and a footage of about 27.5m, use a gamma-ray inclinometer near the drill bit to measure the inclination and ream the wellbore to repair the wellbore wall.

[0057] Step 2: After measuring the well inclination data, the designed slope increase rate was compared. The slope increase was faster, so the size of stabilizer 40 was adjusted to Ø209mm to reduce the slope increase rate.

[0058] Step 3: Repeat the operations of Steps 1 and 2. If the slope increase rate needs to be increased, the outer diameter of the stabilizer 40 is increased. If the slope increase rate needs to be decreased, the outer diameter of the stabilizer 40 is decreased until the coring operation is completed.

[0059] Results:

[0060] For Well X-1, the coring plan was adjusted during actual drilling. The three-opening coring section was from 1851m to 2151m deep. The coring footage increased by 300m, and the well inclination increased from 71.63° to 78.86°. The coring recovery rate was 100%, the wellbore quality was qualified, the average inclination increase rate was 1.6° / 30m, and the trajectory met the changed design requirements.

[0061] The specific effect data is as follows:

[0062]

[0063] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. The oil drilling continuous inclination and shape-conserving coring drill tool is suitable for continuous shape-conserving coring in highly deviated well sections. It is characterized by: include: An outer cylinder (30), a core drill bit (50) is installed at the end of the outer cylinder (30), a flap check valve (20) and a drill rod (10) are installed from bottom to top at the top of the outer cylinder (30), and a stabilizer (40) is installed on the barrel of the outer cylinder (30), and the stabilizer (40) is close to the core drill bit (50); An inner cylinder, wherein the cylinder body of the inner cylinder is sequentially installed with a suspension bearing, a straightening sub and a core claw seat from top to bottom; The suspension bearing is sleeved on the upper end of the inner cylinder to suspend the inner cylinder in the outer cylinder (30), and the core claw seat is suitable for mounting a core claw to cooperate with the coring drill bit (50) to cut the core after breaking the formation.

2. The oil drilling continuous deflection and shape-conserving coring drill according to claim 1, characterized in that: The stabilizer (40) is a micro-drop stabilizer with a specification of Ø186 mm, so that the oil drilling continuous deflection-increasing conformal coring drill tool is suitable for micro-drop coring in highly deviated well sections.

3. The oil drilling continuous deflection-increasing shape-preserving coring drill according to claim 1, characterized in that: The stabilizer (40) is a deflection-stabilizing stabilizer with a specification of Ø196 mm or Ø202 mm, so that the oil drilling continuous deflection-increasing conformal coring drill tool is suitable for deflection-stabilizing coring in highly deviated well sections.

4. The oil drilling continuous deflection-increasing shape-preserving coring drill according to claim 1, characterized in that: The stabilizer (40) adopts a micro-increase stabilizer with a specification of Ø206mm or Ø209mm, so that the oil drilling continuous deflection-increasing conformal coring drill tool is suitable for micro-increase coring in highly deviated well sections.

5. The oil drilling continuous deflection-increasing shape-preserving coring drill according to claim 1, characterized in that: The stabilizer (40) is a deflection-increasing stabilizer with a specification of Ø212 mm, so that the oil drilling continuous deflection-increasing conformal coring drill tool is suitable for deflection-increasing coring in highly deviated well sections.

6. The oil drilling continuous deflection-increasing shape-preserving coring drill tool according to claim 1, characterized in that: A differential nipple and a safety joint are connected between the outer cylinder (30) and the flap-type check valve (20); Wherein, the safety joint is adjacent to the flap-type check valve (20).

7. The oil drilling continuous deflection and shape-preserving coring drill according to claim 1, characterized in that: A weighted drill rod is connected between the drill rod (10) and the flap-type check valve (20).

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