A two-way sand control circulating well flushing valve

Abstract

The utility model discloses a kind of two-way sand prevention circulation well washing valves, it is related to oilfield production tool technical field, including sequentially connected from top to bottom upper sand control screen pipe, sealing sleeve, check valve, lower sand control screen pipe and lower plug, wherein the upper sand control screen pipe is connected with the upper tubing in oil pipe column by upper plug, the lower sand control screen pipe is connected with the lower tubing in oil pipe column by lower plug, the sealing sleeve is used to seal annular space between tubing and casing, the liquid allowable flow direction of the check valve is from bottom to top, the upper sand control screen pipe and lower sand control screen pipe are used to filter the oil liquid passing through;The utility model separates tubing bore by check valve, sealing sleeve separates oil casing annulus, so that well washing fluid only circulates in upper layer, ensure the flow rate when washing well, improve well washing operation efficiency.Simultaneously reduce the adverse effects such as well washing fluid to oil layer Plugging, ensure the oil proportion in produced fluid, improve oilfield overall benefit.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield production tool technical field especially relates to a bidirectional sand prevention circulating well washing valve. BACKGROUND

[0002] In the thin oil well, the impurities generated by the sand and wax in the well, easily enter the oil pump, increase the operation resistance of the oil pump, and seriously block the valve ball, resulting in production accidents; for the well condition of not serious sand and wax, generally will not install the filter tool such as screen pipe below the oil pump, but with time accumulation, a small amount of sand, wax and other impurities enter the gas sand anchor and other tools, reduce the overall pump efficiency; serious can lead to sand burying oil pipe, leading to the pipe column cannot be taken out, so it is necessary to wash well frequently. There are the following problems in the well washing process:

[0003] 1, when washing well, including positive washing, reverse washing, because the oil jacket annulus is connected to the oil layer, if the oil layer permeability is high, it needs to be large displacement pump truck, can return liquid from the wellhead. Otherwise, a large amount of washing fluid penetrates into the oil layer, reduces the washing efficiency, and also blocks the oil layer.

[0004] 2, after excessive washing fluid is washed, the oil content in the produced liquid decreases in a period after starting pumping, reduces the oilfield benefit.

[0005] In summary, how to reduce the influence of washing fluid on the oil layer is a technical problem that the technical personnel in the field need to solve. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a bidirectional sand prevention circulating well washing valve to solve the problems in the prior art, reduce the influence of washing fluid on the oil layer, ensure the oil content in the produced liquid, and improve the overall benefit of the oilfield.

[0007] To achieve the above object, the utility model provides the following scheme:

[0008] The utility model provides a bidirectional sand prevention circulating well washing valve, including upper sand prevention screen pipe, sealing sleeve, check valve, lower sand prevention screen pipe and lower plug which are connected in sequence from top to bottom, wherein the upper sand prevention screen pipe is connected with the upper oil pipe in the oil pipe column through the upper plug, the lower sand prevention screen pipe is connected with the lower oil pipe in the oil pipe column through the lower plug, the sealing sleeve is used for sealing and separating the annular space between the oil pipe and the casing, the liquid flow direction of the check valve is from bottom to top, and the upper sand prevention screen pipe and the lower sand prevention screen pipe are used for filtering the passing oil liquid.

[0009] Preferably, the inner hole of the upper plug is blocked in the middle part, and the upper and lower parts of the inner hole are internal thread structures, the upper end of the upper plug is connected with the upper oil pipe in the oil pipe column through the internal thread, and the lower end of the upper plug is connected with the upper end of the upper sand prevention screen pipe through the internal thread.

[0010] Preferably, a connecting pipe is further included, the sealing sleeve is sleeved outside the connecting pipe and blocks the annular space between the connecting pipe and the casing pipe, and the lower end of the upper sand control screen pipe is threadedly connected to the upper end of the connecting pipe through a joint.

[0011] Preferably, the lower end of the connecting pipe is threadedly connected to the upper end of the one-way valve.

[0012] Preferably, the lower end of the one-way valve is threadedly connected to the upper end of the lower sand control screen pipe through a joint.

[0013] Preferably, the inner hole of the lower plug is blocked in the middle part and the upper and lower parts of the inner hole are internally threaded structures, the upper end of the lower plug is threadedly connected to the lower end of the upper sand control screen pipe, and the lower end of the lower plug is threadedly connected to the lower oil pipe in the oil pipe column.

[0014] Preferably, the pipe wall of the upper sand control screen pipe is provided with screen holes for communicating the outer space and the inner through hole.

[0015] Preferably, the pipe wall of the lower sand control screen pipe is provided with screen holes for communicating the outer space and the inner through hole.

[0016] The utility model discloses relative to prior art has obtained following technical effect:

[0017] The bidirectional sand control circulating well flushing valve in the utility model, through the one-way valve separation oil pipe hole, sealing sleeve separates oil jacket annular, make well flushing fluid only in upper layer circulation, guarantee the flow rate when well flushing, improve well flushing operation efficiency. Simultaneously reduce well flushing fluid to the adverse effects such as the plugging of oil layer, guarantee the oil proportion in produced fluid, improve oilfield overall benefit. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0019] Figure 1 It is the structure diagram of bidirectional sand control circulating well flushing valve in the utility model;

[0020] In the drawing: 1, upper plug;2, upper sand control screen pipe;3, sealing sleeve;4, one-way valve;5, lower sand control screen pipe;6, lower plug. DETAILED DESCRIPTION

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this invention is to provide a bidirectional sand-prevention circulation well-washing valve to solve the problems existing in the prior art.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The bidirectional sand-prevention circulation well-washing valve in this embodiment, such as Figure 1 As shown, the system includes, from top to bottom, an upper plug 1, an upper sand screen pipe 2, a sealing sleeve 3, a one-way valve 4, a lower sand screen pipe 5, and a lower plug 6. The upper sand screen pipe 2 is connected to the upper oil pipe in the tubing string through the upper plug 1, and the lower sand screen pipe 5 is connected to the lower oil pipe in the tubing string through the lower plug 6. The sealing sleeve 3 is used to seal and isolate the annular space between the oil pipe and the casing. The liquid allowed to flow in the one-way valve 4 is from bottom to top. The upper sand screen pipe 2 and the lower sand screen pipe 5 are used to filter the passing oil.

[0025] In this specific embodiment, the middle of the inner hole of the upper plug 1 is blocked and the upper and lower parts of the inner hole are internally threaded. The upper end of the upper plug 1 is connected to the upper oil pipe in the oil pipe column through the internal thread, and the lower end of the upper plug 1 is connected to the upper end of the upper sand screen pipe 2 through the internal thread.

[0026] In this specific embodiment, a connecting pipe is also included. A sealing sleeve 3 is fitted over the outside of the connecting pipe and blocks the annular space between the connecting pipe and the sleeve. The lower end of the upper sand screen pipe 2 is connected to the upper end of the connecting pipe through a joint thread.

[0027] In this specific embodiment, the lower end of the connecting pipe is threaded to the upper end of the one-way valve 4.

[0028] In this specific embodiment, the lower end of the one-way valve 4 is connected to the upper end of the lower sand screen pipe 5 via a threaded connector.

[0029] In the embodiment, the inner hole of the lower plug 6 is blocked in the middle, and the upper and lower parts of the inner hole are internally threaded. The upper end of the lower plug 6 is connected to the lower end of the upper sand control screen pipe 2 through internal threading, and the lower end of the lower plug 6 is connected to the lower oil pipe in the oil pipe column through internal threading. The lower plug 6 makes the lower oil pipe incommunicable, and the oil liquid needs to pass through the annular space between the connecting pipe and the casing. The oil liquid passes through the annular space, enters the lower sand control screen pipe 5, and then passes through the inner hole of the one-way valve 4 to the upper part of the one-way valve 4, and cannot fall back to wait for the oil pump to be extracted to the ground.

[0030] In the embodiment, the pipe wall of the upper sand control screen pipe 2 is provided with screen holes for connecting the external space and the internal through hole.

[0031] In the embodiment, the pipe wall of the lower sand control screen pipe 5 is provided with screen holes for connecting the external space and the internal through hole.

[0032] In use, the bidirectional sand control circulating well flushing valve in the embodiment is installed in the upper part of the oil pipe column. The installation sequence from top to bottom is the box plug, the oil pipe (1-2), the bidirectional sand control circulating well flushing valve in the embodiment, the oil pipe (2-5, which is determined according to the sand production condition of the well), the gas sand anchor, and the oil pump. When flushing the well, the flushing fluid is pumped into the well. Due to the presence of the one-way valve 4, the inner hole of the oil pipe is separated, and the sealing sleeve 3 separates the oil jacket annulus, so that the flushing fluid only circulates in the upper layer, so as to achieve the purpose of well flushing without polluting the formation.

[0033] The specific working principle is as follows:

[0034] 1) The main structure is the flow one-way valve 4. Between the main body of the one-way valve 4 and the inner hole of the casing, the annular space between the oil pipe and the casing is sealed by the “oil and casing annulus sealing sleeve 3”, forming upper and lower two layers of space. The lower layer is connected to the oil layer, and the upper layer includes the oil pipe column above the sucker rod column and the oil pump.

[0035] 2) The oil liquid in the oil layer can pass through the one-way valve 4 and enter the upper layer space, and cannot fall back.

[0036] 3) The screen pipe at the lower part of the one-way valve 4 preliminarily filters the oil layer production fluid, and protects the one-way valve 4 to the greatest extent from being affected by sand, wax and other impurities in the oil layer.

[0037] 4) The screen pipe at the upper part of the one-way valve 4 filters the oil liquid again, improves the working environment of the oil pump, the gas sand anchor and the like. At the same time, it also prevents the impurities in the oil liquid from settling and prevents the one-way valve 4 from being buried by sand, thereby prolonging the normal working period.

[0038] 5) When flushing the well, including forward flushing and reverse flushing, the flushing fluid can only circulate in the upper layer under the blockage of the one-way valve 4 and the sealing sleeve 3, thereby ensuring the flow rate and the well flushing effect.

[0039] The principle and implementation mode of the utility model are described by applying specific examples, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A bi-directional sand control circulating cleanout valve characterized by: The device comprises, from top to bottom, an upper sand control screen, a sealing sleeve, a one-way valve, a lower sand control screen and a lower plug, wherein the upper sand control screen is connected to an upper tubing in a tubing string through an upper plug, the lower sand control screen is connected to a lower tubing in the tubing string through the lower plug, the sealing sleeve is used to seal the annular space between the tubing and the casing, the one-way valve allows liquid to flow from bottom to top, and the upper and lower sand control screens are used to filter the passing oil.

2. The bidirectional sand management circulating cleanout valve of claim 1, wherein: The upper plug is blocked in the middle of its inner hole and the upper and lower parts of the inner hole are internally threaded, the upper end of the upper plug is connected to the upper tubing in the tubing string through internal threads, and the lower end of the upper plug is connected to the upper end of the upper sand control screen through internal threads.

3. The bidirectional sand management circulating cleanout valve of claim 2, wherein: The sealing sleeve is sleeved on the outside of the connecting pipe and blocks the annular space between the connecting pipe and the casing, and the lower end of the upper sand control screen is connected to the upper end of the connecting pipe through a joint.

4. The bidirectional sand management circulating cleanout valve of claim 3, wherein: The lower end of the connecting pipe is connected to the upper end of the one-way valve through threads.

5. The bidirectional sand management circulating cleanout valve of claim 4, wherein: The lower end of the one-way valve is connected to the upper end of the lower sand control screen through a joint.

6. The bidirectional sand management circulating cleanout valve of claim 5, wherein: The lower plug is blocked in the middle of its inner hole and the upper and lower parts of the inner hole are internally threaded, the upper end of the lower plug is connected to the lower end of the lower sand control screen through internal threads, and the lower end of the lower plug is connected to the lower tubing in the tubing string through internal threads.

7. The bidirectional sand management circulating cleanout valve of claim 1, wherein: The upper sand control screen is provided with screen holes on its wall for connecting the outside space and the internal through hole.

8. The bidirectional sand management circulating cleanout valve of claim 1, wherein: The lower sand control screen is provided with screen holes on its wall for connecting the outside space and the internal through hole.

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