Composite coiled tubing slip

Abstract

The utility model relates to the technical field of coiled tubing slips, in particular to a composite coiled tubing slip, which comprises two slip components which are oppositely mounted together, the two slip components are detachably mounted together, each slip component comprises an outer slip and at least one inner slip, sharp teeth are arranged on the inner sides of the inner slips, and the outer slips and the inner slips are detachably mounted. The inner side of the outer slip is in a big-end-up cone shape, the inner slips are all located on the inner side of the outer slip, the outer sides of the inner slips are matched with the inner side of the outer slip, and the upper end of the outer slip is provided with a jackscrew capable of tightly jacking each inner slip. The continuous oil pipe clamping device is reasonable and compact in structure and convenient to use, the two slip assemblies are installed on the outer side of an oil pipe to tightly hold the oil pipe, then the inner slip is pushed by the jackscrew to move downwards along the conical face of the inner side of the outer slip, a continuous oil pipe body is further clamped, and initial clamping force is provided; and the inner slip can move downwards to be continuously locked when the coiled tubing falls.

Description

Technical Field

[0001] The utility model relates to the technical field of coiled tubing slips and is a composite coiled tubing slip. Background Art

[0002] Continuous tubing is generally made of low-carbon alloy steel, which has good flexibility and is also called flexible tubing. A roll of continuous tubing is several kilometers long. Some special processes in oil fields require the use of continuous tubing as an injection channel. After the continuous tubing with tool string passes through the wellhead device and is lowered into the wellbore, the upper end needs to be cut off and separated from the continuous tubing injection equipment. Then, as a section of continuous tubing with equal diameter, the continuous tubing must be reliably suspended on the wellhead device without falling into the bottom of the well under load, which is a new problem. The existing slips are integral slips. The existing technology requires the integral slips to be pre-installed on the wellhead device, the continuous tubing must be pre-passed through the integral slips, the tool string must be connected at the lower end of the integral slips, and then the entire slip must be lowered into the well. The entire operation is cumbersome. Summary of the invention

[0003] The utility model provides a composite coiled tubing slip, which overcomes the shortcomings of the prior art and can effectively solve the stability problem of the prior coiled tubing suspended at a wellhead with a large load.

[0004] The technical solution of the utility model is achieved through the following measures: a composite continuous oil pipe slip, including two slip assemblies relatively installed together, the two slip assemblies are detachably installed together, each group of slip assemblies includes an outer slip and at least one inner slip, the inner side of the inner slip is provided with sharp teeth, the inner side of the outer slip is in a cone shape with a larger upper part and a smaller lower part, the inner slips are all located on the inner side of the outer slips, the outer side of the inner slips matches the inner side of the outer slips, and the upper end of the outer slips is provided with a top screw that can tighten each inner slip.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] Preferably, each inner slip is provided with a deformed long groove.

[0007] Preferably, each group of slip assemblies also includes a sliding pin screw, a sliding pin screw is installed at the lower part of each inner slip, a sliding groove is provided on the outer slip corresponding to the position of each sliding pin screw, and the outer part of the sliding pin screw is located in the sliding groove.

[0008] Preferably, each group of slip assemblies also includes positioning screws, and each inner slip is detachably mounted with the outer slip via the positioning screws, and the positioning screws are removed before tightening the top screws.

[0009] The utility model has a reasonable and compact structure and is easy to use. It installs two-petal slip assemblies on the outside of the oil pipe to hold the oil pipe tightly, and then pushes the inner slip to move downward along the inner conical surface of the outer slip through the top screw, further biting the coiled oil pipe body, providing an initial biting force, and ensuring that the inner slip can move downward and continue to lock when the coiled oil pipe falls. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a schematic diagram of the front view and half-section structure of this practical embodiment.

[0011] Attached Figure 2 For attachment Figure 1 Schematic diagram of the right view structure of the inner cava.

[0012] The codes in the attached drawings are: 1 for external cava, 2 for internal cava, 3 for sharp teeth, 4 for top screw, 5 for deformed long groove, 6 for sliding pin screw, 7 for sliding groove, 8 for positioning screw and 9 for fastening bolt. DETAILED DESCRIPTION

[0013] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0014] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0015] The present invention is further described below in conjunction with the embodiments and drawings:

[0016] Embodiment 1: As attached Figure 1 , 2 As shown, the composite continuous oil pipe slip comprises two slip assemblies relatively installed together, the two slip assemblies are detachably installed together, each group of slip assemblies comprises an outer slip 1 and at least one inner slip 2, the inner side of the inner slip 2 is provided with sharp teeth 3, the inner side of the outer slip 1 is in a cone shape with a larger upper part and a smaller lower part, the inner slips 2 are all located on the inner side of the outer slip 1, the outer side of the inner slip matches the inner side of the outer slip 1, and the upper end of the outer slip 1 is provided with a top screw 4 that can tighten each inner slip 2.

[0017] When in use, the inner slip 2 is installed in the outer slip 1, and each group of slip assemblies is installed first. When the continuous oil pipe enters the well, the two groups of slip assemblies are connected and tightened by the fastening bolts 9 at the set position of the pipe body to hold the continuous oil pipe, and then the top screw 4 is tightened to tighten the inner slip 2. The outer conical surface of the inner slip 2 slides downward along the inner conical surface of the outer slip 1, and the sharp teeth 3 of the inner slip 2 bite the continuous oil pipe body to provide an initial bite force. When the continuous oil pipe moves downward, it drives the inner slip 2 to slide downward. Due to the effect of the inner conical surface of the outer slip 1, the sharp teeth 3 of the inner slip 2 bite deeper into the continuous oil pipe body, thereby providing a larger suspension load and realizing the self-tightening function. The utility model is installed at the oil pipe hanging position in the oil pipe head, and there is no need to add wellhead components. The outer slip 1 is installed in the oil pipe head, and the top screw 4 is tightened on the top and the step is positioned on the bottom, so that the continuous oil pipe is suspended in the oil pipe head.

[0018] The above composite coiled tubing slips can be further optimized and / or improved according to actual needs:

[0019] Embodiment 2: As attached Figure 1 , 2 As shown, each inner slip 2 is provided with a deformable long groove 5. By providing the deformable long groove 5, the inner slip 2 can be deformed so that its sharp teeth 3 can further bite the coiled tubing body.

[0020] Embodiment 3: As attached Figure 1 As shown, each group of slip assemblies also includes a sliding pin screw 6, and a sliding pin screw 6 is installed at the lower part of each inner slip 2. A sliding groove 7 is provided on the outer slip 1 corresponding to the position of each sliding pin screw 6, and the outer part of the sliding pin screw 6 is located in the sliding groove 7. The inner slip 2 and the outer slip 1 are connected by the sliding pin screw 6 to prevent them from being scattered.

[0021] Embodiment 4: As attached Figure 1 As shown, each set of slip assemblies also includes a positioning screw 8, and each inner slip 2 is detachably mounted with the outer slip 1 through the positioning screw 8, and the positioning screw 8 is removed before tightening the top screw 4. Each inner slip 2 is installed in the outer slip 1 through the positioning screw 8, and then the sliding pin screw 6 is installed. After the installation is completed, the positioning screw 8 is removed and the top screw 4 is tightened to provide an initial pre-tightening force.

[0022] The utility model has a two-stage pre-tightening function, which has one more pre-tightening mode than the existing single-stage pre-tightening mode, and can realize the forced clamping function of the fixed slip, and can realize the self-tightening function of the slip by pressing down the inner slip 2 through the top screw 4 to increase the initial bite; it is installed on the pipe body before the continuous oil pipe is cut off, so as to ensure that the continuous oil pipe does not fall into the wellbore; the segmented structure does not need to change the process of the continuous oil pipe entering the well, and the operation is simple and reliable; when it is dismantled at a later time, the inner slip 2 is connected to the outer slip 1 by the sliding pin screw 6, and the size of the outer slip 1 is larger than the diameter of the oil pipe head, which can avoid the risk of the slip falling into the wellbore due to operating errors.

[0023] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A composite coiled tubing slip, characterized in that It includes two slip assemblies which are relatively installed together. The two slip assemblies can be detachably installed together. Each group of slip assemblies includes an outer slip and at least one inner slip. The inner side of the inner slip is provided with sharp teeth. The inner side of the outer slip is in a cone shape which is larger at the top and smaller at the bottom. The inner slips are all located on the inner side of the outer slips. The outer side of the inner slips matches the inner side of the outer slips. The upper end of the outer slips is provided with a top screw which can tighten each inner slip.

2. The composite coiled tubing slip according to claim 1, characterized in that Each inner slip is provided with a deformed long groove.

3. The composite coiled tubing slip according to claim 1 or 2, characterized in that Each set of slip components also includes a sliding pin screw. A sliding pin screw is installed at the bottom of each inner slip. A sliding groove is provided on the outer slip corresponding to the position of each sliding pin screw, and the outer part of the sliding pin screw is located in the sliding groove.

4. The composite coiled tubing slip according to claim 1 or 2, characterized in that Each set of slip components also includes positioning screws, and each inner slip is detachably mounted with the outer slip through the positioning screws. The positioning screws are removed before tightening the top screws.

5. The composite coiled tubing slip according to claim 3, characterized in that Each set of slip components also includes positioning screws, and each inner slip is detachably mounted with the outer slip through the positioning screws. The positioning screws are removed before tightening the top screws.

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