Casing straightening device and straightening method for horizontal well completion

Abstract

The present invention discloses a casing straightening device and a straightening method for horizontal well completion. The casing straightening device comprises a connected reamer and a straightener; the reamer is a cylindrical structure with two ends opened, and one end is connected to the straightener; a plurality of gears are rotatably connected to the outer wall of the reamer; the straightener comprises a straightener body, a straightening slip and a sliding mechanism, the straightening slip is hinged to the outer wall of the straightener body, and the sliding mechanism can move axially along the straightener body to control the opening and closing of the straightening slip. The present invention has the following advantages: by heating the casing straightening device for horizontal well completion, the gas in the closed accommodation chamber is expanded, and the push-out cylinder drives the hinged straightening slip to expand around, so as to realize the squeezing and fixing of the straightener to the inner wall of the wellbore; by rotating the casing straightening device for horizontal well completion, the gravity of the straightener is prevented from affecting the expansion angle of the straightening slip to the surroundings; by lowering the external temperature, the gas is contracted, and then the disc spring pushes the push-out cylinder to reset, so as to move the straightener.

Description

Technical Field

[0001] The invention relates to a casing straightening device and a straightening method for horizontal well completion, belonging to the technical field of cementing. Background Art

[0002] Casing cementing and perforating completion is one of the important ways to complete horizontal wells. However, the current horizontal well cementing has problems such as eccentricity and poor centering of the horizontal section casing, and uneven thickness of the cement ring formed after cementing, which seriously affects the cementing quality of horizontal wells and the production capacity advantages of horizontal wells. At present, the most effective way to improve the cementing quality of horizontal wells is to add rigid centralizers to the horizontal section casing, but conventional rigid centralizers have the following disadvantages: large outer diameter, difficult to lower the casing; easy to pierce the well wall when lowering, forming sand plugs; insufficient bearing capacity, poor casing centering quality. Therefore, it is necessary to improve the structure of the existing centralizer. Summary of the invention

[0003] The purpose of the present invention is to provide a casing straightening device and a straightening method for horizontal well completion, so as to solve the problem of poor centering quality of the existing casing.

[0004] The casing straightening device for horizontal well completion provided by the present invention comprises a reamer and a straightening device connected thereto;

[0005] The reamer is a cylindrical structure with two ends open, one end of which is connected to the centralizer;

[0006] A plurality of gears are rotatably connected to the outer wall of the reamer;

[0007] The centralizer comprises a centralizer body, a centralizer slip and a sliding mechanism. The centralizer slip is hinged on the outer wall of the centralizer body. The sliding mechanism can move axially along the centralizer body to control the opening and closing of the centralizer slip.

[0008] In the above-mentioned casing straightening device, an outer push cylinder is slidably fitted on the outer wall of the straightening device body;

[0009] One end of the outer push tube is in abutment with the sliding mechanism, and the other end is detachably connected to the drill rod;

[0010] When the outer push cylinder moves axially along the centralizer body, the opening and closing of the centralizing slips are controlled.

[0011] In the above-mentioned casing straightening device, a fixing ring is fixedly matched on the outer wall of the straightening device body, and a closed accommodating cavity is formed between the fixing ring and the outer push tube;

[0012] A disc spring is arranged in the sealed accommodation chamber, and the disc spring is arranged between the fixing ring and the outer push cylinder.

[0013] In the above-mentioned casing straightening device, the sliding mechanism includes a main shaft, a roller and a sliding member which are slidably connected.

[0014] In the above-mentioned casing straightening device, the straightener further comprises a restraining ring, and the restraining ring passes through a restraining hole provided on the straightening slip and is connected with the straightening slip.

[0015] In the above-mentioned casing straightening device, a cone mounting seat is provided on the reamer, and the cone mounting seat is rotatably connected to the cone.

[0016] In the above-mentioned casing straightening device, a water jet nozzle is rotatably connected to the cone mounting seat.

[0017] The present invention also provides a casing straightening method for horizontal well completion, comprising the following steps:

[0018] S1. Injecting a low-boiling-point liquid into the closed receiving chamber of the casing straightening device for the horizontal well completion;

[0019] The low boiling point liquid may be liquid hydrogen, liquid ammonia, liquid formaldehyde, liquid chlorine, etc.;

[0020] S2, detachably connecting the two ends of the casing straightening device of the horizontal well completion to the two ends of the casing;

[0021] S3, heating the sealed accommodation chamber to vaporize the low-boiling-point liquid to generate gas, and under the action of the expansion of the gas, the sliding mechanism is pushed to move axially along the centralizer body to open the centralizing slips;

[0022] The heating temperature can be calculated according to the following formula:

[0023]

[0024] Where P is the boiling point of the liquid in mmHg;

[0025] T refers to temperature, in °C;

[0026] A, B, and C are characteristic constants associated with the liquid;

[0027] For example, when calculating the boiling point of water vapor, A = 8.07131, B = 1730.63, C = 233.426;

[0028] S4, cooling the sealed accommodation chamber, and under the action of the gas contraction, the sliding mechanism moves axially along the centralizer body to close the centralizing slips;

[0029] S5. Change the casing straightening device of the horizontal well completion to another target position, and repeat steps S3-S4.

[0030] Compared with the prior art, the present invention has the following beneficial technical effects:

[0031] By heating the casing straightening device of the horizontal well completion, the gas in the closed containing chamber expands, and the push tube drives the hinged straightening slips to expand in all directions, so as to realize the squeezing and fixing of the centralizer on the inner wall of the wellbore. By rotating the casing straightening device of the horizontal well completion, the gravity of the centralizer is prevented from affecting the expansion angle of the straightening slips in all directions. By lowering the external temperature, the gas shrinks, and then the disc spring pushes the push tube to reset, so that the centralizer moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a casing straightening device for horizontal well completion of the present invention;

[0033] Figure 2 yes Figure 1 Middle AA section view;

[0034] Figure 3 yes Figure 2 Exploded view of the middle centralizer 2;

[0035] Figure 4 It is a schematic diagram of the working state of the sliding mechanism;

[0036] Figure 5 This is an exploded diagram of the sliding mechanism.

[0037] The marks in the figure are as follows:

[0038] 1-reamer, 2-stabilizer, 3-accommodating chamber, 11-tooth wheel, 12-tooth wheel mounting seat, 13-water jet nozzle, 21-stabilizer body, 22-stabilizing cava, 23-sliding mechanism, 231-main shaft, 232-roller, 233-sliding part, 24-external push cylinder, 25-fixing ring, 26-disc spring, 27-restraint ring. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0040] like Figure 1 As shown, the casing straightening device for horizontal well completion provided by the present invention includes a reamer 1 and a straightener 2. The reamer 1 is a cylindrical structure with openings at both ends. A plurality of cone mounting seats 12 are evenly distributed on the outer wall of the reamer 1. Each cone mounting seat 12 is rotatably connected to a plurality of cones 11 and water jet nozzles 13.

[0041] The centralizer 2 comprises a centralizer body 21, a centralizer slip 22 and a sliding mechanism 23. The centralizer slip 22 is hinged on the outer wall of the centralizer body 21. The sliding mechanism 23 is slidably connected to the centralizer body 21 along the axis direction of the centralizer body 21. The sliding mechanism 23 is arranged to abut against the centralizer slip 22. Figure 1 shown.

[0042] like Figure 2 and Figure 3 As shown, the centralizer 2 further includes an outer push tube 24 which is slidably connected to the centralizer body 21 , one end of which is detachably connected to the drill pipe, and the other end of which is abutted against one end of the sliding mechanism 23 .

[0043] A fixing ring 25 is also provided on the outer wall of the centralizer body 21, and a closed accommodating chamber 3 is formed between the outer push tube 24 and the fixing ring 25. A disc spring 26 is provided in the closed accommodating chamber 3, and the disc spring 26 is arranged between the fixing ring 25 and the outer push tube 24.

[0044] In order to constrain the righting slips 22, a constraining ring 27 passes through a constraining hole provided on the righting slips 22 and is connected to the righting slips 22. Figure 3 shown.

[0045] like Figure 4 and Figure 5 As shown, the sliding mechanism 23 includes a main shaft 231 , a roller 232 and a sliding member 233 , and the main shaft 231 is slidably connected to the roller 232 and the sliding member 233 .

[0046] When the casing straightening device of the present invention is used to straighten the casing, the following steps can be followed:

[0047] S1. Inject low-boiling-point liquid, such as liquid hydrogen, liquid ammonia, liquid formaldehyde, liquid chlorine, etc., into the closed receiving chamber 3 of the casing straightening device of the horizontal well completion;

[0048] S2, detachably connecting the two ends of the casing straightening device of the horizontal well completion to the two ends of the casing;

[0049] S3, heating the use environment of the casing straightening device for horizontal well completion;

[0050] The heating temperature can be calculated according to the following formula:

[0051]

[0052] Where P is the boiling point of the liquid in mmHg;

[0053] T refers to temperature, in °C;

[0054] A, B, and C are characteristic constants associated with the liquid;

[0055] S4, the gas expands to compress the disc spring 26, and after the outer push tube 24 is compressed, it pushes the sliding mechanism 23 to open the righting slips 22;

[0056] S5, cooling the ambient temperature of the casing centralizing device for horizontal well completion to normal to change the position of the centralizer, waiting to move to the target position, and repeating steps S3-S4.

[0057] From the above-mentioned righting process, it can be known that by heating the casing righting device of the horizontal well completion, the gas in the closed accommodation chamber is expanded, and the outer push tube drives the hinged righting slips to expand around, so as to realize the squeezing and fixing of the centralizer to the inner wall of the wellbore. By rotating the casing righting device of the horizontal well completion, the gravity of the centralizer is prevented from affecting the expansion angle of the righting slips around, and the gas is contracted by lowering the external temperature, and then the disc spring pushes the outer push tube to reset, so that the centralizer moves.

Claims

1. A casing centralizing device for horizontal well completion, comprising a reamer and a centralizer connected; The reamer is a cylindrical structure with two ends open, one end of which is connected to the centralizer; A plurality of gears are rotatably connected to the outer wall of the reamer; The centralizer comprises a centralizer body, a centralizer slip and a sliding mechanism, wherein the centralizer slip is hinged on the outer wall of the centralizer body, and the sliding mechanism can move axially along the centralizer body to control the opening and closing of the centralizer slip; The sliding mechanism comprises a main shaft, a roller and a sliding member which are slidably connected; An outer push cylinder is slidably fitted on the outer wall of the centralizer body; One end of the outer push cylinder is in abutment with the sliding mechanism; When the outer push cylinder moves axially along the centralizer body, it controls the opening and closing of the centralizing slips; A fixing ring is also fixedly fitted on the outer wall of the centralizer body, and a closed accommodating cavity is formed between the fixing ring and the outer push tube; A disc spring is provided in the sealed accommodation chamber, and the disc spring is arranged between the fixing ring and the outer push cylinder; The centralizer further comprises a restraint ring, and the restraint ring passes through a restraint hole provided on the centralizing slip and is connected with the centralizing slip.

2. The casing straightening device according to claim 1, characterized in that: The reamer is provided with a cone mounting seat, and the cone mounting seat is rotatably connected to the cone.

3. The casing straightening device according to claim 2, characterized in that: The cone mounting seat is rotatably connected with a water jet nozzle.

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