The utility model discloses a pipe string in a drainage well, which includes a gas anchor, a submersible pump body, an oil pipe, a pull rod, and a guide. The gas anchor is assembled and connected to the lower inlet end of the submersible pump body. The upper end is connected with the oil pipe, the oil pipe is provided with a pulling rod, the lower end of the pulling rod is connected to the end of the screw rotor in the submersible pump body, the pulling rod is provided with multiple sections and a guide is connected between the multiple sections The upper end of the pulling rod is in transmission connection with the surface driving unit of the screw submersible pump. The utility model has the advantages of simple structure, high pump efficiency, energy saving and low cost; it can prevent external sand particles from entering the interior and can prevent clogging.

   1. A pipe string in a drainage well, characterized in that it comprises a gas anchor, a submersible pump body, a tubing, a pull rod, and a guide, the gas anchor is assembled and connected to the lower inlet end of the submersible pump body, and the submersible pump The upper end of the body is connected with an oil pipe, the oil pipe is provided with an oil rod, the lower end of the oil rod is in transmission connection with the end of the screw rotor in the submersible pump body, and the oil rod is provided with multiple sections and connections between multiple sections There is a guide, and the upper end of the pulling rod is drivingly connected with the ground driving unit of the screw submersible pump.

   2. The pipe string in a drainage well according to claim 1, wherein the gas anchor comprises an anchor body, the anchor body is cylindrical, and the side plate of the anchor body is provided with a plurality of A penetrating suction port, a barrier tube is arranged in the anchor body, the upper end of the barrier tube is fixed on the side wall of the anchor body, the middle part of the barrier tube is provided with a through hole that penetrates up and down, and the height of the lower end of the barrier tube is Lower than the suction port, a blocking cavity is formed between the outer side of the blocking cylinder and the suction port; the lower end of the anchor body is sealed with a wire plug.

   3. The pipe string in a drainage well according to claim 2, wherein the outer side of the plug is tapered.

   4. The pipe string in a drainage well according to claim 1, characterized in that: the submersible pump body comprises a cylinder, the upper end of the cylinder is provided with a liquid outlet joint, and the inside of the cylinder is fixed A screw pump stator, the cavity of the screw pump stator is sleeved with a screw pump rotor, the lower end of the screw pump stator is connected with a liquid inlet filter jacket, and the side wall of the liquid inlet filter jacket is provided with the lower end An open communicating liquid inlet, the lower end of the cylinder body is connected with the upper end of the air anchor.

   5. The pipe string in a drainage well according to claim 1, wherein an electronic pressure gauge is arranged on the outer wall of the tubing, and the electronic pressure gauge is arranged at one end close to the submersible pump body, and the electronic pressure The meter is connected with the electrical signal of the outer wall control system through a cable.

   The pipe string in a drainage well according to claim 5, characterized in that: the outer wall of the tubing is provided with a cable protector which is convenient for protecting the connecting cable on the electronic pressure gauge.

A kind of pipe string in the drainage well Technical field

[0001] The utility model relates to the technical field of coal-bed methane mining, in particular to a pipe string in a coal-bed methane tapping extraction well. BACKGROUND OF THE INVENTION [0002] Coalbed methane refers to the hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, partly free in coal pores or dissolved in coal seam water, and is an associated mineral of coal. The resource is unconventional natural gas, a clean, high-quality energy and chemical raw material that has risen internationally in the past ten or twenty years. Commonly known as "gas", its calorific value is 2-5 times that of general-purpose coal. The calorific value of 1 cubic meter of pure coalbed methane is equivalent to 1.13kg gasoline and 1.21kg standard coal. Its calorific value is equivalent to natural gas and can be mixed with natural gas. And it is clean after burning. If coalbed methane is mined before coal mining, the coal mine gas explosion rate will be reduced by 70% to 85%.

[0003] The abbreviation of coalbed methane drainage and production system drainage gas production, that is, the use of mechanical lifting equipment to lift the water in the wellbore to the ground, and gradually reduce the bottom hole flow pressure. As the bottom hole pressure decreases, a pressure drop funnel is gradually formed and gradually expands outwards, thereby gradually reducing the reservoir pressure of the coal bed, forcing the coalbed methane adsorbed on the inner surface of the coal matrix pores to be desorbed, and then through the non-Darcy seepage of the matrix pores And diffuse into natural fissures, the coalbed methane then seeps from the fissures to the wellbore, thereby being produced. The existing drainage pipe string in the well has low drainage efficiency and is easy to be blocked during the drainage process. Utility model content

[0004] The purpose of the present utility model is to solve the above-mentioned shortcomings and provide a pipe string in a drainage well.

[0005] In order to achieve the above purpose, the technical solution of the present invention is: a pipe string in the drainage well, including a gas anchor, a submersible pump body, a tubing, a pull rod, and a guide, the gas anchor is assembled and connected to the submersible The lower inlet end of the oil pump body, the upper end of the submersible pump body is connected with an oil pipe, and an oil pull rod is arranged in the oil pipe, and the lower end of the oil pull rod is drivingly connected to the end of the screw rotor in the submersible pump body. The pull rod is provided with multiple sections and a guide is connected between the multiple sections, and the upper end of the pull rod is in transmission connection with the ground driving unit of the screw submersible pump.

[0006] Further, the air anchor includes an anchor body, the anchor body is cylindrical, the side plate of the anchor body is provided with a plurality of through suction ports, the anchor body is provided with a barrier tube, so The upper end of the barrier tube is fixed on the side wall of the anchor body, the middle part of the barrier tube is provided with a through hole that penetrates up and down, the height of the lower end of the barrier tube is lower than the suction port, and the outer side of the barrier tube is between the suction port A barrier cavity is formed; the lower end of the anchor body is sealed with a plug.

[0007] Further, the outer side of the plug is tapered.

[0008] Further, the submersible pump body includes a cylinder, the upper end of the cylinder is provided with a liquid outlet connector, the inside of the cylinder is fixed with a screw pump stator, and the cavity of the screw pump stator is sleeved Screw pump rotor, the lower end of the screw pump stator is connected with a liquid inlet filter jacket, the side wall of the liquid inlet filter jacket is provided with a liquid inlet hole communicating with the opening at the lower end of the barrel, and the lower end of the barrel is connected with The upper ends of the air anchors are connected.

[0009] Further, an electronic pressure gauge is arranged on the outer wall of the oil pipe, and the electronic pressure gauge is arranged at an end close to the submersible pump body, and the electronic pressure gauge is electrically signal connected to the outer wall control system through a cable.

[0010] Further, the outer wall of the oil pipe is provided with a cable protector which is convenient for protecting the connecting cable on the electronic pressure gauge.

[0011] The utility model has a simple structure, high pump efficiency, energy saving and low cost; it can block external sand particles from entering the interior and can prevent clogging.

Description of the drawings

[0012] FIG. 1 is a schematic diagram of the structure of the utility model.

[0013] FIG. 2 is a schematic diagram of the structure of the gas anchor and submersible pump body in the utility model.

[0014] In the figure: 1-gas anchor, 2-submersible pump body, 3-tubing, 4-pull rod, 5-guide, 11-anchor body, 111-suction port, 12-barrier tube, 121-pass Hole, 13-screw plug, 21-cylinder, 211-outlet joint, 22-screw pump stator, 23-screw pump rotor,

24-Inlet filter jacket. detailed description

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not All examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0016] As shown in FIG. 1 and FIG. 2, a pipe string in a drainage well includes a gas anchor 1, a submersible pump body 2, an oil pipe 3, a draw rod 4, and a guide 5. The gas anchor 1 is assembled and connected to The lower inlet end of the submersible pump body 2, the upper end of the submersible pump body 2 is connected to the oil pipe 3, the oil pipe 3 is provided with a pulling rod 4, and the lower end of the pulling rod 4 is connected to the screw rotor in the submersible pump body 2 21, the pull rod 4 is provided with multiple sections and a guide 5 is connected between the multiple sections. The upper end of the pull rod 4 is in transmission connection with the surface driving unit of the screw submersible pump. The transmission drives the submersible pump body 2 to pump out the lower end medium.

[0017] Specifically, the air anchor 1 includes an anchor body 11, the anchor body 11 is cylindrical, a side plate of the anchor body 11 is provided with a plurality of through suction ports 111, the anchor body 11 A barrier tube 12 is provided inside, the upper end of the barrier tube 12 is fixed on the side wall of the anchor body 11, the middle part of the barrier tube 12 is provided with a through hole 121 that penetrates up and down, and the height of the lower end of the barrier tube 12 is lower than A suction port 111, a blocking cavity is formed between the outer side of the blocking cylinder 12 and the suction port 111; the lower end of the anchor body 11 is connected with a plug 13 in a sealing manner.

[0018] Specifically, the outer side of the plug 13 is tapered.

[0019] Specifically, the submersible pump body 2 includes a cylinder 21, and the upper end of the cylinder 21 is provided with a liquid outlet joint 211

                         Reprinted from "State Intellectual Property Office of the People's Republic of China"