An integrated load display and connection tool and its usage method

Abstract

The present invention provides an integral load display back connection tool and its usage method. The inner wall of the tail end of the upper joint is threadedly connected to the outer wall of the head end of the central tube. The outer wall of the tail end of the central tube is threadedly connected to the inner wall of the head end of the load display elastic claw. The seal is sleeved on the lower outer wall of the central tube and is located above the load display elastic claw. Slots are evenly formed on the side wall of the load display elastic claw. A boss is formed in the middle of the outer wall of the load display elastic claw. The boss generates radial pressure contraction through inclined plane extrusion. When the boss reaches the groove of the sand settling packer sealing cylinder, it will automatically pop out and cooperate with it. The inner diameter of the back connection tool is consistent with that of the upper completion sand control string above, which provides convenience and a larger size option for the lowering of water injection tools and other production string tools, and is beneficial to the improvement of the water injection volume in water injection operations and the oil production volume in the production link.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield production well completion, and more particularly to an integral load display tie-back tool and a use method thereof. Background Art

[0002] At present, the requirements for the displacement of water injection strings at sea are gradually being raised. The outer diameter of the water injection tool is an important factor restricting the water injection displacement. To increase the outer diameter of the water injection tool, the inner diameter of the matching water injection and sand control tool must be increased. The water injection string often passes through the completion sand control tool string. The inner diameter of the tieback tool at the bottom of the sand control tool string is the key position restricting the inner diameter of the entire string. Therefore, how to achieve the inner diameter of the tieback tool and the sand settling packer after the cooperation still maintains the same inner diameter as the top packer and the isolation packer assembly has always been particularly important. To achieve the consistency of the overall inner diameter of the sand control string, the structure of the sand control packer tieback tool must be improved. Summary of the invention

[0003] The present invention overcomes the shortcomings in the prior art. The existing sand control string cannot achieve a unified internal diameter of the string after being connected back, resulting in that the water injection tool can only select a smaller internal diameter size of the string, affecting the increase in water injection volume of the water injection well. An integral load display connection tool and a method for using the same are provided. The connection tool and the internal diameter of the upper completion sand control string are consistent, which provides convenience and a larger size option for the lowering of the water injection tool and other production string tools, and is beneficial to the increase of water injection volume in the water injection operation and oil production in the production link.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] An integral load display tie-back tool comprises an upper joint, a center pipe, a sealing member and a load display elastic claw, wherein the inner wall of the tail end of the upper joint is threadedly connected to the outer wall of the head end of the center pipe, the outer wall of the tail end of the center pipe is threadedly connected to the inner wall of the head end of the load display elastic claw, the sealing member is sleeved on the lower outer wall of the center pipe and is located above the load display elastic claw, slits are evenly formed on the side walls of the load display elastic claw, a boss is formed in the middle of the outer wall of the load display elastic claw, the boss generates radial pressure contraction through inclined surface extrusion, and the boss automatically pops out and cooperates with the groove of the sealing tube of the sand packer when it reaches the groove.

[0006] A reduced diameter section is formed on the lower outer wall of the central tube, the outer wall of the reduced diameter section is threadedly connected to the inner wall of the head end of the load display elastic claw, the head end of the load display elastic claw forms a limiting step higher than the reduced diameter section, the seal is located in the reduced diameter section, and the limiting step can limit the position of the seal.

[0007] The tail end of the boss adopts a sloped structure, and the head end of the boss adopts a rectangular structure.

[0008] A method for using an integral load display tie-back tool is performed in the following steps:

[0009] Step 1, connect the integral load display tieback tool and lower it into the sand trap packer;

[0010] Step 2, when the load display elastic claw in the integral load display tie-back tool passes through the groove of the sand packer sealing tube in the sand packer, the boss on the load display elastic claw is squeezed by the inclined surface to generate radial pressure contraction, and the boss will automatically pop out and cooperate with the groove of the sand packer sealing tube after reaching the groove. The load display elastic claw can be locked after entering the groove in the packer, and the sand packer can be pulled out after the tie-back tool is lifted, thereby completing the removal of the sand packer.

[0011] The beneficial effects of the present invention are as follows: the present invention has two major functional improvements. First, when the tieback tool and the sand packer sealing tube are tied back, the internal diameter of the entire sand control string can be kept consistent after the tieback; second, the internal diameter of the tieback tool and the upper completion sand control string is kept consistent, which provides convenience and a larger size option for the lowering of water injection tools and other production string tools, and is beneficial to the increase of water injection volume in water injection operations and oil production in the production link. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 Schematic diagram of the structure of the present invention in cooperation with a sand trap packer, wherein A is a schematic diagram of the structure of the sand trap packer, and B is a schematic diagram of the structure of the present invention in cooperation with the sand trap packer;

[0014] Figure 3 This is a schematic diagram of an old-style tieback tool;

[0015] Figure 4 This is a schematic diagram of the tieback of the old-style tieback tool and the sand trap packer;

[0016] In the figure: 1 is the upper joint; 2 is the center pipe; 3 is the sealing element; 4 is the load display elastic claw; 5 is the sealing tube groove of the sand packer; 6 is the upper joint-Ⅰ; 7 is the sealing module-Ⅰ; 8 is the connecting short section-Ⅰ; 9 is the anchoring slip-Ⅰ; 10 is the mandrel-Ⅰ; 11 is the boss; E is the inner diameter of the tie-back tool of the old-style sand control packer; F is the inner diameter of the old-style sand packer; G is the matching position between the sealing module and the sealing surface of the old-style sand packer; H is the threaded anchoring fixing position of the old-style tie-back tool and the packer.

[0017] For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on the above drawings. Detailed implementation manners

[0018] The technical solution of the present invention will be further described below through specific embodiments.

[0019] Embodiment 1

[0020] An integral load display and back - connection tool includes an upper joint 1, a central tube 2, a seal 3, and a load - display elastic claw 4. The inner wall of the tail end of the upper joint 1 is thread - connected to the outer wall of the head end of the central tube 2. The outer wall of the tail end of the central tube 2 is thread - connected to the inner wall of the head end of the load - display elastic claw 4. The seal 3 is sleeved on the lower outer wall of the central tube 2 and is located above the load - display elastic claw 4. Cuts are evenly formed on the side wall of the load - display elastic claw 4. A boss 11 is formed in the middle of the outer wall of the load - display elastic claw 4. The boss 11 generates radial pressure contraction through inclined - plane extrusion. When the boss 11 reaches the groove 5 of the sand - settling packer sealing cylinder, it will automatically pop out and cooperate with it.

[0021] Embodiment 2

[0022] On the basis of Embodiment 1, a reduced - diameter section is formed on the lower outer wall of the central tube 2. The outer wall of the reduced - diameter section is thread - connected to the inner wall of the head end of the load - display elastic claw 4. A limiting step higher than the reduced - diameter section is formed at the head end of the load - display elastic claw 4. The seal 3 is located within the reduced - diameter section, and the limiting step can limit the position of the seal 3.

[0023] The tail end of the boss 11 adopts a slope - like structure, and the head end of the boss 11 adopts a rectangular structure.

[0024] Embodiment 3

[0025] A method for using an integral load display and back - connection tool is carried out according to the following steps:

[0026] Step 1: After connecting the integral load display and back - connection tool, lower it into the sand - settling packer.

[0027] Step 2: When the load - display elastic claw in the integral load display and back - connection tool passes through the groove of the sand - settling packer sealing cylinder in the sand - settling packer, the boss on the load - display elastic claw generates radial pressure contraction through inclined - plane extrusion. After the boss reaches the groove of the sand - settling packer sealing cylinder, it will automatically pop out and cooperate with it. After the load - display elastic claw enters the inner groove of the packer, locking can be achieved. After the back - connection tool is lifted, the sand - settling packer can be pulled out, thereby completing the removal of the sand - settling packer.

[0028] Such as Figure 4As shown, after the combination of the old back connection tool and the sand settling packer, the internal diameters represented by the internal diameter E of the old sand control packer back connection tool and the internal diameter F of the old sand settling packer cannot be made consistent. The internal diameter of the old back connection tool is smaller. In the later stage, when other pipe strings pass through here, the size selection can only be based on the old back connection tool. The mating position G between the sealing module and the sealing surface of the old sand settling packer and the structural design of the threaded anchoring and fixing position H between the old back connection tool and the packer directly limit the increase of the internal diameter of the back connection tool. Therefore, this invention changes the structural combination of the mating position G between the sealing module and the sealing surface of the old sand settling packer and the threaded anchoring and fixing position H between the old back connection tool and the packer, achieving Figure 2 the combined effect of B.

[0029] For ease of explanation, in the embodiments, spatial relative terms such as "upper", "lower", "left", and "right" are used to describe the relationship of one element or feature shown in the figure with respect to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" the other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0030] Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0031] The above has described the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. An integral load display and reconnecting tool, characterized in that: It includes an upper sub, a central tube, a seal, and a load - indicating elastic claw. The inner wall of the tail end of the upper sub is thread - connected to the outer wall of the head end of the central tube. The outer wall of the tail end of the central tube is thread - connected to the inner wall of the head end of the load - indicating elastic claw. The seal is sleeved on the lower outer wall of the central tube and is located above the load - indicating elastic claw. Slits are evenly formed on the side wall of the load - indicating elastic claw, and a boss is formed in the middle of the outer wall of the load - indicating elastic claw. A reduced - diameter section is formed on the lower outer wall of the central tube. The outer wall of the reduced - diameter section is thread - connected to the inner wall of the head end of the load - indicating elastic claw. A limiting step higher than the reduced - diameter section is formed at the head end of the load - indicating elastic claw. The seal is located within the reduced - diameter section, and the limiting step can limit the position of the seal. The tail end of the boss has a sloped structure, and the head end of the boss has a rectangular structure.

2. The usage method of an integral load display and reconnecting tool as described in claim 1, characterized in that: It is carried out according to the following steps: Step 1: After connecting the integral load - indicating back - connection tool, lower it into the sand - settling packer. Step 2: When the load - indicating elastic claw in the integral load - indicating back - connection tool passes through the groove of the sand - settling packer seal cylinder in the sand - settling packer, the boss on the load - indicating elastic claw is squeezed by the inclined plane to generate radial pressure and shrink. After the boss reaches the groove of the sand - settling packer seal cylinder, it will automatically pop out and cooperate with it. The load - indicating elastic claw can be locked after entering the inner groove of the packer. After the back - connection tool is lifted, the sand - settling packer can be pulled out, thus completing the removal of the sand - settling packer.

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