Special efficient slow-release type oil-displacing agent release device for oil exploitation

Abstract

The utility model discloses a special efficient slow-release type oil-displacing agent release device for oil exploitation, which relates to the technical field of oil exploitation and comprises an oil-displacing agent storage cavity and a plurality of layers of composite wrapping particles filled in the oil-displacing agent storage cavity. The multi-layer composite wrapping particle comprises a high-temperature-resistant layer, a controllable slow-release layer, a release control layer and an oil-displacing agent, stable slow release and intelligent release of the oil-displacing agent are achieved through the multi-layer composite wrapping structure and in combination with a temperature and pressure dual-adjustment mechanism, the high-temperature-resistant layer prevents the oil-displacing agent from being degraded too early, and the oil-displacing agent is prevented from being degraded too early. The controllable slow-release layer is gradually dissolved through temperature change, the release control layer dynamically adjusts the release rate through a microporous structure, and meanwhile, the elastic membrane and the pressure response membrane have a synergistic effect, so that the oil displacement agent is slowly released in a high-pressure environment and is quickly released at a low pressure, the recovery efficiency is improved, and the long-term effectiveness of the oil displacement agent is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil exploitation, and specifically relates to a high -efficient slow -release type oil displacement agent release device for oil exploitation. BACKGROUND

[0002] In the process of oil exploitation, in order to improve the oil recovery, oil displacement agent is usually used to improve the oil-water interface characteristics, improve the fluid mobility, and reduce the residual oil retention.

[0003] However, the existing oil displacement agent release mode has some problems:

[0004] Firstly, the release rate of oil displacement agent is difficult to control. The existing oil displacement agent release technology mainly adopts direct injection or uniform diffusion, but these methods are difficult to adapt to different reservoir conditions, and are prone to cause the oil displacement agent to diffuse too fast or release unevenly in the reservoir, thereby affecting the oil displacement effect.

[0005] Secondly, in high-temperature reservoirs, part of the oil displacement agent degrades too early due to high temperature, reducing the oil displacement efficiency, and in the environment where the reservoir pressure changes greatly, the release rate of the oil displacement agent is fixed, cannot adapt to the needs of different pressure stages, causes the oil displacement agent to release too fast in the early stage, and reduces the recovery efficiency in the later stage.

[0006] Therefore, we propose a high -efficient slow -release type oil displacement agent release device for oil exploitation. CONTENT OF THE UTILITY MODEL

[0007] 1. Problem to be solved

[0008] In view of the problems existing in the prior art, the purpose of the utility model is to provide a high -efficient slow -release type oil displacement agent release device for oil exploitation to solve the problems mentioned in the background art.

[0009] 2. Technical scheme

[0010] To achieve the above purpose, the utility model provides the following technical scheme:

[0011] A high -efficient slow -release type oil displacement agent release device for oil exploitation, comprising an oil displacement agent storage cavity and a plurality of composite coated particles, the oil displacement agent storage cavity is filled with a plurality of composite coated particles, the plurality of composite coated particles comprise a high-temperature-resistant layer, a controllable slow-release layer, a release control layer and an oil displacement agent, the outside of the oil displacement agent is sequentially coated with a release control layer, a controllable slow-release layer and a high-temperature-resistant layer.

[0012] As a further scheme of the utility model: the material of the high-temperature-resistant layer is a ceramic diaphragm.

[0013] As a further scheme of the utility model: the material of the controllable slow-release layer is polylactic acid.

[0014] As a further scheme of the utility model: the material of release control layer is siloxane polymer.

[0015] As a further scheme of the utility model: the inner end face of release control layer is equipped with elastic diaphragm.

[0016] As a further scheme of the utility model: the outer end face of release control layer is equipped with pressure response membrane.

[0017] Compared with prior art, the utility model has the beneficial effects of:

[0018] The utility model discloses a multilayer composite coating structure, and realizes the stable slow release and intelligent release of the oil displacement agent by combining temperature and pressure double regulation mechanism, the high-temperature resistant layer prevents the oil displacement agent from degrading too early, the controllable slow release layer gradually dissolves through temperature change, the release control layer utilizes the microporous structure to dynamically regulate the release rate, simultaneously, the elastic diaphragm and pressure response membrane cooperate to make the oil displacement agent slowly release under high pressure, and accelerate the release under low pressure, improve the recovery rate, and ensure the long-term effectiveness of the oil displacement agent. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a structural schematic view of a kind of high-efficiency slow-release type oil displacement agent release device special for oil exploitation;

[0020] Fig. 2 It is a structural schematic view of multilayer composite wrapping particle in a kind of high-efficiency slow-release type oil displacement agent release device special for oil exploitation.

[0021] In the drawing: 1, oil displacement agent storage cavity;2, multilayer composite wrapping particle;21, high-temperature resistant layer;22, controllable slow release layer;23, release control layer;3, oil displacement agent;4, elastic diaphragm. DETAILED DESCRIPTION

[0022] The technical scheme in the utility model embodiment will be described clearly and completely in conjunction with the drawings of the utility model embodiment.

[0023] Please refer to Figs. 1-2 In the utility model embodiment, a kind of high-efficiency slow-release type oil displacement agent release device special for oil exploitation, including oil displacement agent storage cavity 1 and multilayer composite wrapping particle 2.

[0024] The oil displacement agent storage cavity 1 is filled with multilayer composite wrapping particle 2, and the multilayer composite wrapping particle 2 includes high-temperature resistant layer 21, controllable slow release layer 22, release control layer 23 and oil displacement agent 3, and the outside of the oil displacement agent 3 is sequentially wrapped with release control layer 23, controllable slow release layer 22 and high-temperature resistant layer 21.

[0025] The material of the high-temperature-resistant layer 21 is a ceramic diaphragm, the material of the controllable slow-release layer 22 is polylactic acid, the material of the release control layer 23 is a siloxane polymer, the inner end face of the release control layer 23 is provided with an elastic diaphragm 4, and the outer end face of the release control layer 23 is provided with a pressure-responsive film.

[0026] It should be noted that the utility model discloses a multilayer composite coating structure, and combines temperature response and pressure response adjustment mechanism, effectively solve the release rate of the existing oil displacement agent release device is uncontrollable, the problem of insufficient high-temperature resistance, unable to adapt to the change of oil reservoir pressure and other problems, make the oil displacement agent can be released stably under the high-temperature high-pressure oil reservoir environment, and the release rate is dynamically adjusted according to the oil reservoir condition, thereby improving the oil recovery.

[0027] The multilayer composite coating structure is adopted, the stability and slow-release effect of the oil displacement agent are improved, the high-temperature-resistant layer 21 adopts a ceramic diaphragm, which can effectively prevent the oil displacement agent from degrading in advance under a high-temperature environment, so that the oil displacement agent can remain stable in a high-temperature oil reservoir environment, the adaptability of the device is improved, the controllable slow-release layer 22 adopts polylactic acid (PLA), the material gradually degrades under a specific temperature, the release rate of the oil displacement agent can be adjusted by changing the thickness of the polylactic acid, so that the oil displacement agent can diffuse to the oil layer at a relatively uniform speed, the oil displacement efficiency is improved, the release control layer 23 adopts a siloxane polymer, the material can adjust the micropore structure of itself along with the change of the oil reservoir environment, so as to further control the release speed of the oil displacement agent and ensure the long-term slow-release effect of the oil displacement agent.

[0028] Through the multilayer composite structure, the loss of the oil displacement agent in the wellbore or the non-target oil layer can be effectively reduced, so that the oil displacement agent can act on the target oil layer for a long time, and the utilization efficiency of the oil displacement agent is improved.

[0029] The release control layer 23 adopts a siloxane polymer, the inner end face of the release control layer 23 is provided with an elastic diaphragm 4, and the outer end face of the release control layer 23 is provided with a pressure-responsive film, and the elastic diaphragm 4 and the pressure-responsive film jointly form a double-layer pressure adjustment structure.

[0030] The elastic diaphragm 4 is mainly used for initially closing the oil displacement agent release channel, preventing the oil displacement agent from being released in advance under a high-pressure environment, and ensuring that the oil displacement agent is only released under suitable conditions, when the oil reservoir pressure decreases, the diaphragm gradually rebounds, so that the release channel is opened, and the release rate of the oil displacement agent is increased, the pressure-responsive film is installed on the outer end face of the release control layer 23 and directly contacts the oil reservoir environment, when the oil reservoir pressure is relatively high, the pressure-responsive film remains in a closed state, so that the release rate of the oil displacement agent is reduced, when the oil reservoir pressure decreases (for example, after the oil recovery of the oil reservoir decreases), the pressure-responsive film is gradually opened, the release channel is increased, and the release rate of the oil displacement agent is improved, so as to adapt to the needs of different recovery stages.

[0031] Through the double-layer adjustment mode, the oil displacement agent can be intelligently adjusted in release rate, can be slowly released when the reservoir pressure is high, and can be accelerated in release when the reservoir pressure is low, so that long-term effectiveness of the oil displacement agent is ensured.

[0032] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency slow-release oil displacement agent release device for oil production, characterized in that, The application relates to a kind of oil displacement agent storage cavity (1) and multi-layer composite wrapping particles (2) filled in the oil displacement agent storage cavity (1). The oil displacement agent storage cavity (1) is filled with multi-layer composite wrapping particles (2), and the multi-layer composite wrapping particles (2) comprise a high-temperature-resistant layer (21), a controllable slow-release layer (22), a release control layer (23) and an oil displacement agent (3), and the oil displacement agent (3) is sequentially wrapped with the release control layer (23), the controllable slow-release layer (22) and the high-temperature-resistant layer (21) outside. The material of the high-temperature-resistant layer (21) is a ceramic diaphragm.

2. The high-efficiency slow-release oil displacement agent release device for oil exploitation according to claim 1, characterized in that, The material of the controllable slow-release layer (22) is polylactic acid.

3. The device for releasing a high-efficiency, slow-release oil displacement agent for oil production according to claim 1, characterized in that, The material of the release control layer (23) is a siloxane polymer.

4. The device for releasing a high-efficiency, slow-release oil displacement agent for oil production according to claim 1, characterized in that, An elastic diaphragm (4) is installed on the inner end face of the release control layer (23).

5. The device for releasing a high-efficiency, slow-release oil displacement agent for oil production according to claim 4, characterized in that, A pressure-responsive film is installed on the outer end face of the release control layer (23).

6. The device for releasing a high-efficiency, slow-release oil displacement agent for oil production according to claim 4, characterized in that, ​

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