CN-121994997-A - Device and method for evaluating and testing water lock inhibiting and releasing agent of water-gas reservoir

CN121994997ACN 121994997 ACN121994997 ACN 121994997ACN-121994997-A

Abstract

The invention discloses a water lock inhibition and release agent evaluation experiment device and method for a water and gas reservoir, wherein the device comprises at least three intermediate containers, a sand filling pipe and a plurality of liquid level sensors, wherein the bottoms of the intermediate containers are respectively provided with a corresponding medium outflow pipe, the outlet ends of the medium outflow pipes are respectively connected with a medium main pipe, water, gas and water lock inhibition and release agents are respectively arranged in the intermediate containers, porous mediums are arranged in the sand filling pipe, the inlet ends of the sand filling pipe are connected with the medium main pipe, the outlet ends of the sand filling pipe are connected with a liquid phase separator through pipelines, the upper ends of the liquid phase separator are provided with gas flow pipelines, the gas flow pipelines are provided with gas phase flow meters, and the liquid level sensors are respectively used for detecting the liquid levels of the intermediate containers provided with water, the intermediate containers provided with the water lock inhibition and release agents and the liquid phase separator. The invention has the beneficial effects that the dynamic water saturation of the water reservoir with stratum water invading the seepage channel in the production process is obtained, and the effects of the dynamic water lock inhibitor and the dynamic water lock remover are further obtained.

Inventors

XIONG GANG
SHU ZHENG
XIONG YING
FENG RUSEN
CHEN PENGFEI
XU CHENGJUN
LI WEI
LIU PINGLI

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (16)

1. An experimental device for evaluating a water lock inhibitor and a water lock remover of a water-gas reservoir, which is characterized by comprising: The device comprises at least three intermediate containers, wherein water, gas and water lock inhibiting and releasing agents are respectively arranged in the intermediate containers, the bottoms of the intermediate containers are respectively provided with corresponding medium outflow pipes, and the outlet ends of a plurality of medium outflow pipes are respectively connected with a medium main pipe; The sand filling pipe is internally provided with a porous medium, the inlet end of the sand filling pipe is connected with the medium main pipe, the outlet end of the sand filling pipe is connected with the liquid phase separator through a pipeline, the upper end of the liquid phase separator is provided with an airflow pipeline, and the airflow pipeline is provided with a gas phase flowmeter; The liquid level sensors are respectively used for detecting the liquid levels of the intermediate container provided with water, the intermediate container provided with the water lock inhibitor and the release agent and the liquid phase separator.
2. The experimental device for evaluating the water lock inhibition and release agent of the water and gas reservoir according to claim 1, further comprising a constant pressure structure, wherein the constant pressure structure comprises a gas source, a constant pressure controller and a gas source pipeline, the gas source is connected to the inlet of the gas source pipeline, the outlet of the gas source pipeline is connected with a corresponding intermediate container through a plurality of branch pipelines connected in parallel, and the constant pressure controller is connected with the gas source pipeline.
3. The experimental device for evaluating water lock inhibition and release agent for a water and gas reservoir according to claim 1, wherein the intermediate containers comprise a first intermediate container, a second intermediate container and a third intermediate container, wherein an air source is arranged in the first intermediate container, a water source is arranged in the second intermediate container, and a water lock inhibition and release agent is arranged in the third intermediate container.
4. The experimental device for evaluating a water lock inhibitor and release agent for a hydrocarbon reservoir according to claim 3, wherein when reservoir stratum water is arranged in the second intermediate container, a coloring agent is arranged in the reservoir stratum water, and the sand filling pipe is made of transparent materials.
5. The experimental device for evaluating the water lock inhibition and release agent of the water and gas reservoir according to claim 4, further comprising a high-definition camera, wherein the high-definition camera is installed right above the sand filling pipe, and scales are arranged on the sand filling pipe.
6. The experimental device for evaluating the water lock inhibiting and releasing agent of the water and gas reservoir according to claim 3, wherein the heating jackets are sleeved on the outer sides of the intermediate containers, the sand filling pipe is arranged in the incubator, and the heating jackets stop working when pure water is filled in the second intermediate containers.
7. The experimental device for evaluating the water lock inhibition and release agent of the water and gas reservoir according to claim 1, wherein the medium outflow pipes are respectively provided with a corresponding control valve, and the control valves are electromagnetic valves.
8. The apparatus according to claim 1, further comprising a gas phase dryer connected to the gas flow line and located upstream of the gas phase flow meter.
9. The experimental device for evaluating a water lock inhibitor and release agent of a water and gas reservoir according to any one of claims 1 to 8, further comprising an automatic control and data acquisition system, wherein the automatic control and data acquisition system is connected with all liquid level sensors, all control valves, a high-definition camera and a gas phase flowmeter.
10. A method for evaluating and testing a water lock inhibitor and a water lock remover for a water reservoir, which is characterized by being implemented based on the device for evaluating and testing the water lock inhibitor and the water lock remover for the water reservoir according to any one of claims 1 to 9, and comprising the following steps: s1, obtaining initial water saturation of a porous medium; S2, obtaining real-time water saturation of continuously injecting gas and formation water into the porous medium, and obtaining real-time flow of the gas flowmeter; s3, injecting a water lock inhibitor and a water lock release agent into the porous medium, and then injecting air to obtain the water saturation of the porous medium after the water lock inhibitor and the water lock release agent are injected; s4, after the water lock inhibiting and releasing agent is injected into the porous medium, continuously injecting gas and real-time water saturation of formation water, and measuring the real-time flow of the gas flowmeter.
11. The experimental method for evaluating a water lock inhibitor and release agent for a hydrocarbon reservoir according to claim 10, wherein the heating jackets for heating the first intermediate container, the second intermediate container, the third intermediate container and the sand filling pipe are started to operate at the reservoir temperature when steps S2, S3 and S4 are performed.
12. The experimental method for evaluating the water lock suppression and release agent of the water and gas reservoir according to claim 10, wherein when the steps S2 and S4 are executed, the high-definition camera continuously works, and the positions of the front edges of the reservoir stratum water in the different states of the steps S2 and S4 entering the porous medium are photographed to draw a time-dependent change curve of the reservoir stratum water migration distance in the porous medium before and after the injection of the water lock suppression and release agent.
13. The method according to claim 10, wherein a first calculation formula is set to obtain the initial water saturation Sw 00 in step S1, and the first calculation formula is: Wherein m 0 is the dry weight of the porous medium, m 1 is the weight of the porous medium after saturated with pure water, PV is the pore volume of the porous medium tested by adopting the saturated pure water mode, and ρ Water and its preparation method is the density of water.
14. The experimental method for evaluating a water lock suppression and release agent for a hydrocarbon reservoir according to claim 10, wherein a second calculation formula is set to obtain the water saturation Sw 0i in step S2, and the second calculation formula is as follows: Wherein Sw 00 is the initial water saturation of the porous medium in step S1, V 20 is the initial formation water volume in the second intermediate container, V 2i is the formation water volume in the second intermediate container in step S2, V 4i is the liquid phase volume in the liquid phase separator in step S2, and PV is the pore volume of the porous medium tested by means of saturated pure water.
15. The experimental method for evaluating a water lock suppression and release agent for a hydrocarbon reservoir according to claim 10, wherein a third calculation formula is set to obtain the water saturation Sw 10 in step S3, and the third calculation formula is as follows: Wherein ρ is the density of the water lock inhibitor and remover, m 2 is the weight of the porous medium containing the water lock inhibitor and remover in step S3, m 0 is the dry weight of the porous medium, and PV is the pore volume of the porous medium obtained by testing in a saturated pure water manner.
16. The experimental method for evaluating a water lock suppression and release agent for a hydrocarbon reservoir according to claim 10, wherein a fourth calculation formula is set to obtain the water saturation Sw 1i in step S4, and the fourth calculation formula is as follows: Wherein Sw 10 is the water saturation of the porous medium in step S4, V 20 is the initial formation water volume in the second intermediate container, V 2i is the formation water volume in the second intermediate container in step S4, V 4i is the liquid phase volume in the liquid phase separator in step S4, and PV is the pore volume of the porous medium tested by means of saturated pure water.

Description

Device and method for evaluating and testing water lock inhibiting and releasing agent of water-gas reservoir Technical Field The invention relates to the field of natural gas exploitation, in particular to an experimental device and method for evaluating a water lock inhibitor and a water lock remover of a water gas reservoir. Background Along with the continuous development of a water-gas reservoir, a water film is formed on the surface of a porous medium by a water phase, water drops are generated in a seepage channel, the water saturation of the seepage channel is continuously increased, the gas phase seepage resistance is increased, the seepage area is reduced, the seepage channel is blocked, a water locking effect is caused in the porous medium, natural gas is blocked by trapping, the gas yield is rapidly reduced, and normal production cannot be performed. Many water lock inhibiting and releasing agents have been developed for inhibiting and releasing reservoir water lock, but the current methods of evaluating the effect of water lock inhibiting and releasing agents are mainly evaluated by testing surface tension, contact angle, and permeability recovery. The existing evaluation methods are mainly suitable for evaluating the static effect of water lock inhibiting and releasing agents caused by the fact that ground working fluid enters a reservoir, are not suitable for evaluating the dynamic water lock inhibiting and releasing agent effect of stratum water, side water and bottom water invading a seepage channel in the production process of a water-gas reservoir, and cannot evaluate the water lock speed, dynamic seepage capability and dynamic water saturation change condition in a porous medium when two gas-liquid phases exist in the production process of the water-gas reservoir. Disclosure of Invention The invention aims to provide an experimental device and a method for evaluating water lock inhibition and release agent of a water and gas reservoir, which are used for obtaining dynamic volumes of water, gas and water lock inhibition corresponding to the water lock inhibition and release agent before and after adding the water lock inhibition and release agent through the device, obtaining dynamic water saturation of the water reservoir with stratum water entering a porous medium in the production process, and further obtaining the effect of the dynamic water lock inhibition and release agent. The invention is realized by the following technical scheme: The experimental device comprises at least three intermediate containers, sand filling pipes and a plurality of liquid level sensors, wherein the bottoms of the intermediate containers are respectively provided with a corresponding medium outflow pipe, the outlet ends of the medium outflow pipes are respectively connected with a medium main pipe, water, gas and water lock inhibition and release agents are respectively arranged in the intermediate containers, porous mediums are arranged in the sand filling pipes, the inlet ends of the sand filling pipes are connected with the medium main pipes, the outlet ends of the sand filling pipes are connected with a liquid phase separator through pipelines, the upper ends of the liquid phase separator are provided with gas flow pipelines, the gas flow pipelines are provided with gas phase flow meters, and the liquid level sensors are respectively used for detecting the liquid levels of the intermediate containers provided with water, the intermediate containers provided with the water lock inhibition and release agents and the liquid phase separator. The invention has the advantages that the water, gas and water lock inhibitor and release agent are respectively arranged in the intermediate container, so that the water, gas and water lock inhibitor and release agent in the intermediate container can be dynamically injected into the sand filling pipe, the porous medium is arranged in the sand filling pipe, the water, gas and water lock inhibitor and release agent can be dynamically injected into the porous medium, the volume of the water lock inhibitor and release agent in the corresponding intermediate container and the volume in the liquid phase separator are detected through the corresponding sensors, the gas flow meter is used for detecting the gas flow out of the liquid phase separator, the dynamic water saturation of the water-gas reservoir in the production process, such as stratum water and the like, entering the seepage channel (porous medium) is obtained, the dynamic water lock inhibitor and release agent effect is obtained, a more reliable evaluation method is preferably provided for evaluating the water lock inhibitor and release agent, the change rule of the yield of the water-gas reservoir can be analyzed, and technical guidance is provided for the efficient development of the water-gas reservoir. In some embodiments, the device further comprises a constant pressure structure, wherein the constant pres