阅读说明：本技术 一种随钻成膜模拟装置及随钻成膜取芯方法 (Film-forming while drilling simulation device and film-forming while drilling coring method ) 是由 *** 刘涛 赵治宇 吴一凡 朱亮宇 兰铖 蒋文川 翟朔 廖海龙 高明忠 张茹 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种随钻成膜模拟装置及随钻成膜取芯方法,涉及模拟钻探技术领域；其包括筒体及设于筒体内的活塞推杆、扶正筒、岩芯筒和固定活塞组件,以使在模拟实验过程中筒体内腔充满介质液,并连接加热装置和高压泵以模拟原位真实温压环境；在岩芯筒内具有储液罐和静态混合器的成膜控制部件,在储液罐的底部开设有贯穿储液罐底部的泄流通道,静态混合器设置于泄流通道内,在储液罐内设有用于控制盛装有成膜液A和成膜液B的变径通孔与泄流通道相互连通或阻断的浮动活塞；通过实施本技术方案,旨在解决现有密闭取芯技术无法达到完全保质取芯的问题,能够通过模拟还原深地原位环境成膜液与岩芯相对运动过程,为实地保质取芯提供有力的技术支撑。(The invention discloses a film-forming while drilling simulation device and a film-forming while drilling coring method, and relates to the technical field of simulated drilling; the device comprises a cylinder body, a piston push rod, a centering cylinder, a rock core cylinder and a fixed piston assembly, wherein the piston push rod, the centering cylinder, the rock core cylinder and the fixed piston assembly are arranged in the cylinder body, so that a medium liquid is filled in an inner cavity of the cylinder body in the simulation experiment process, and a heating device and a high-pressure pump are connected to simulate an in-situ real temperature and pressure environment; a film forming control part with a liquid storage tank and a static mixer is arranged in the core barrel, a drainage channel penetrating through the bottom of the liquid storage tank is arranged at the bottom of the liquid storage tank, the static mixer is arranged in the drainage channel, and a floating piston for controlling the communication or the blockage of a reducing through hole filled with film forming liquid A and film forming liquid B and the drainage channel is arranged in the liquid storage tank; by implementing the technical scheme, the problem that the existing closed coring technology cannot achieve full quality guarantee coring is solved, and powerful technical support can be provided for quality guarantee coring on the spot by simulating and reducing the relative motion process of the film forming liquid and the rock core in the deep in-situ environment.)

1. A simulation device for forming a film while drilling is characterized in that: comprises a cylinder body, a piston push rod, a righting cylinder, a rock core cylinder and a fixed piston assembly which are arranged in the cylinder body, wherein

An upper sealing cover and a lower sealing cover are respectively arranged at two ends of the cylinder body, a liquid injection port is formed in the lower end of the cylinder body, and a liquid discharge port is formed in the upper sealing cover at the top of the cylinder body, so that a cylinder inner cavity is filled with medium liquid in the simulation experiment process to restore the underground in-situ fluid environment; the righting cylinder is used for accommodating a rock core and is fixedly connected with the inner wall of the cylinder body;

the core barrel is fixedly connected with the righting barrel, a film forming control part is arranged in the core barrel, the film forming control part comprises a liquid storage tank and a static mixer, at least two reducing through holes are arranged along the axial direction of the liquid storage tank and are respectively used for containing a film forming liquid A and a film forming liquid B; the fixed piston assembly is arranged at the upper end of the liquid storage tank and is used for sealing the top opening of the reducing through hole; the bottom of the reducing through hole is provided with a plug for sealing the bottom opening, the bottom of the liquid storage tank is provided with a drainage channel penetrating through the bottom of the liquid storage tank, the static mixer is arranged in the drainage channel, a floating piston is arranged in the liquid storage tank, and the floating piston is used for controlling the mutual communication or blocking of the reducing through hole containing the film forming liquid A and the reducing through hole containing the film forming liquid B and the drainage channel; the piston push rod is arranged at the position, close to the inner cavity of one side of the lower sealing cover, of the barrel, a pump oil hole for driving the piston push rod to move is arranged on the barrel, the action end of the piston push rod can penetrate through the bottom of the righting barrel to push the rock core and the liquid storage tank to move upwards along the rock core barrel, so that in the process of moving the liquid storage tank upwards, the reducing through hole and the drainage channel, which are filled with the film forming liquid A and the film forming liquid B, are communicated with each other, and the film forming liquid A and the film forming liquid B flow into the drainage channel and flow into an annular gap between the rock core and the inner wall of the rock core barrel after being mixed by the static mixer.

2. The filming while drilling simulation apparatus of claim 1, wherein: the middle part of liquid storage pot has the spacing boss of mutually supporting with the core section of thick bamboo to make the liquid storage pot can follow the interior upward movement of core section of thick bamboo and restrict its down removal along the core section of thick bamboo, be equipped with the medium overflow hole that runs through the core section of thick bamboo lateral wall near spacing boss department.

3. The filming while drilling simulation apparatus of claim 1, wherein: and liquid flow channels communicated with the drainage channel are respectively arranged along the radial direction of the liquid storage tank corresponding to each reducing through hole, so that the film forming solution A and the film forming solution B can be converged in the drainage channel through the liquid flow channels.

4. The filming while drilling simulation apparatus of claim 3, wherein: the reducing through holes and the corresponding liquid flow passages are uniformly distributed along the circumferential direction of the liquid storage tank.

5. The device for simulating while drilling film formation according to claim 4, wherein: the liquid storage tank is provided with four reducing through holes, wherein one reducing through hole is obliquely and symmetrically arranged and is used for containing the film forming liquid A, and the other two reducing through holes are obliquely and symmetrically arranged and are used for containing the film forming liquid B.

6. The filming while drilling simulation apparatus of claim 1, wherein: the film-forming liquid A is a mixed liquid of polysiloxane with vinyl and polymethylhydrosiloxane with viscosity of 100-; the film-forming liquid B is a mixed liquid of polysiloxane with vinyl and platinum catalyst with viscosity of 100-50000mpa.s, preferably, the polysiloxane with vinyl is polysiloxane with vinyl at a terminal group or a side group, and further preferably, the polysiloxane is vinyl-terminated polydimethylsiloxane or vinyl-terminated polymethylphenylsiloxane.

7. The filming while drilling simulation apparatus of claim 1, wherein: the fixed piston assembly comprises a piston rod and a fixed piston fixed at the bottom of the piston rod, the piston rod is fixed above the liquid storage tank and axially extends along the liquid storage tank, and the fixed piston is fixed at the top of the reducing through hole and is in sealing connection with the reducing through hole.

8. The device for simulating while drilling film formation according to claim 7, wherein: a centering ring is arranged on the inner side of the cylinder body close to the upper sealing cover, and the piston rod is fixed on the top of the inner cavity of the cylinder body through the centering ring; and a rubber ring is embedded on the side wall of the lower end of the core barrel and used for righting the core to move upwards along the core barrel.

9. The filming while drilling simulation apparatus of claim 1, wherein: the liquid storage pot is close to one side of core and installs the top cap, is close to at the core piston push rod one side is provided with down the top cap, it all has the pointed cone shape protruding with lower top cap to contact the upper surface and the lower surface of core with the pointed cone shape is protruding respectively.

10. The method for realizing the coring while drilling film formation by adopting the simulation device for the film formation while drilling as recited in any one of claims 1 to 9, is characterized in that: the coring method for the film formation while drilling comprises the following steps:

an experiment preparation stage: assembling the film-forming while drilling simulation device; calculating the amount of film-forming components required for forming quality-guaranteeing film-forming solutions with different thicknesses, separating the amount of the mixed film-forming components capable of undergoing a curing reaction into a film-forming solution A and a film-forming solution B, and respectively placing the film-forming solution A and the film-forming solution B into variable-diameter through holes of a liquid storage tank; finally, medium liquid is filled into the barrel cavity from the barrel liquid injection port, and the temperature and the pressure in the barrel are maintained at the experiment set values through a heating device and a high-pressure pump so as to simulate a real in-situ environment;

the experimental process stage: pumping hydraulic oil into the barrel body through the oil pumping hole, driving the piston push rod to move upwards, so that the piston push rod pushes the rock core and the liquid storage tank to move upwards along the rock core barrel until the reducing through hole containing the film forming liquid A and the film forming liquid B is communicated with the drainage channel, so that the film forming liquid A and the film forming liquid B flow into the drainage channel to be converged and uniformly mixed by the static mixer, then flow into an annular gap between the rock core and the inner wall of the rock core barrel, displace medium liquid in the annular gap, and form quality-guaranteeing film forming liquid with a curing film forming function around the rock core;

and (3) at the end stage of the experiment: after the rock core completely enters the rock core barrel, the quality-guaranteeing film-forming liquid completely covers the rock core; and (3) curing the quality-guaranteeing film-forming liquid after a certain time of chemical reaction on the surface of the rock core to form a solid quality-guaranteeing sealing film, thus finishing the film-forming coring experiment while drilling.

Technical Field

The invention relates to the technical field of simulated drilling, in particular to a film-forming while drilling simulation device and a film-forming while drilling coring method.

Background

In the actual process of drilling a rock stratum for coring and taking out the rock core, the rock core is polluted by bottom-hole stratum water or drilling fluid and the like, so that the in-situ quality, the oil-gas content, the humidity and the like of the rock core are influenced, and after the rock core is taken out, the change of the living environment of microorganisms is caused due to the influence of air, so that the scientific research is influenced; meanwhile, the loss of oil and gas resources in the rock core can cause resource assessment distortion, and therefore the quality guarantee of deep rock drilling coring basically adopts a closed coring technology to realize in-situ quality guarantee coring, namely a polymer-based closed liquid is adopted to form a layer of liquid film on the surface of the taken rock core so as to reduce the dip dyeing of the drilling fluid on the rock core.

A large amount of scientific drilling researches have been carried out in China, but the prior closed coring technology cannot completely guarantee quality and core, which is very unfavorable for exploring in-situ environment, oil and gas resource exploration and deep life science research, and the rock in-situ quality-guaranteeing coring technology is urgently needed to lay a foundation for deep rock scientific exploration and research, and meanwhile, for deeply exploring quality-guaranteeing coring, a film-forming-while-drilling simulation device/film-forming-while-drilling coring method is urgently needed to be researched and designed by technical personnel in the field, so that favorable technical support is provided for on-site quality-guaranteeing coring.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a film-forming while-drilling simulation device and a film-forming while-drilling coring method, aiming at solving the problem that the in-situ quality of a rock core is affected because the closed coring technology cannot achieve complete quality-guaranteeing coring in the prior art, providing powerful technical support for the in-situ quality-guaranteeing coring by simulating and reducing the relative movement process of a film-forming liquid and the rock core in a deep in-situ environment, and having good popularization and use values.

The technical scheme adopted by the invention is as follows:

a simulation device for forming a film while drilling comprises a cylinder body, a piston push rod, a righting cylinder, a rock core cylinder and a fixed piston assembly, wherein the piston push rod, the righting cylinder, the rock core cylinder and the fixed piston assembly are arranged in the cylinder body

An upper sealing cover and a lower sealing cover are respectively arranged at two ends of the cylinder body, a liquid injection port is formed in the lower end of the cylinder body, and a liquid discharge port is formed in the upper sealing cover at the top of the cylinder body, so that a cylinder inner cavity is filled with medium liquid in the simulation experiment process to restore the underground in-situ fluid environment; the righting cylinder is used for accommodating a rock core and is fixedly connected with the inner wall of the cylinder body;

the core barrel is fixedly connected with the righting barrel, a film forming control part is arranged in the core barrel, the film forming control part comprises a liquid storage tank and a static mixer, at least two reducing through holes are arranged along the axial direction of the liquid storage tank and are respectively used for containing a film forming liquid A and a film forming liquid B; the fixed piston assembly is arranged at the upper end of the liquid storage tank and is used for sealing the top opening of the reducing through hole; the bottom of the reducing through hole is provided with a plug for sealing the bottom opening, the bottom of the liquid storage tank is provided with a drainage channel penetrating through the bottom of the liquid storage tank, the static mixer is arranged in the drainage channel, a floating piston is arranged in the liquid storage tank, and the floating piston is used for controlling the mutual communication or blocking of the reducing through hole containing the film forming liquid A and the reducing through hole containing the film forming liquid B and the drainage channel;

the piston push rod is arranged at the position, close to the inner cavity of one side of the lower sealing cover, of the barrel, a pump oil hole for driving the piston push rod to move is arranged on the barrel, the action end of the piston push rod can penetrate through the bottom of the righting barrel to push the rock core and the liquid storage tank to move upwards along the rock core barrel, so that in the process of moving the liquid storage tank upwards, the reducing through hole and the drainage channel, which are filled with the film forming liquid A and the film forming liquid B, are communicated with each other, and the film forming liquid A and the film forming liquid B flow into the drainage channel and flow into an annular gap between the rock core and the inner wall of the rock core barrel after being mixed by the static mixer.

The film-forming solution A and the film-forming solution B in the technical scheme are film-forming components which can generate curing reaction after being mixed.

Preferably, the middle part of the liquid storage tank is provided with a limiting boss matched with the core barrel, so that the liquid storage tank can move upwards in the core barrel to limit the liquid storage tank to move downwards along the core barrel, and a medium overflow hole penetrating through the side wall of the core barrel is formed in the position close to the limiting boss.

As the optimization of the above technical scheme, a liquid flow channel communicated with the drain channel is respectively arranged along the radial direction of the liquid storage tank corresponding to each diameter-variable through hole, so that the deposition solution A and the deposition solution B can be converged in the drain channel through the liquid flow channel.

Preferably, the reducing through holes and the corresponding liquid flow passages are uniformly distributed along the circumferential direction of the liquid storage tank.

Preferably, the liquid storage tank is provided with four reducing through holes, one of the reducing through holes is obliquely and symmetrically arranged and is used for containing the film forming solution A, and the other two reducing through holes are obliquely and symmetrically arranged and are used for containing the film forming solution B, so that the mixing uniformity of the film forming solution A and the film forming solution B is improved.

Preferably, the film-forming solution A is a mixed liquid of polysiloxane with vinyl and polymethylhydrosiloxane with viscosity of 100-50000mpa.s, preferably, the polysiloxane with vinyl is polysiloxane with vinyl at a terminal group or a side group, and further preferably, the polysiloxane is vinyl-terminated polydimethylsiloxane or vinyl-terminated polymethylphenylsiloxane; the film-forming liquid B is a mixed liquid of polysiloxane with vinyl and platinum catalyst with viscosity of 100-50000mpa.s, preferably, the polysiloxane with vinyl is polysiloxane with vinyl at a terminal group or a side group, and further preferably, the polysiloxane is vinyl-terminated polydimethylsiloxane or vinyl-terminated polymethylphenylsiloxane.

Preferably, the fixed piston assembly comprises a piston rod and a fixed piston fixed at the bottom of the piston rod, the piston rod is fixed above the liquid storage tank and axially extends along the liquid storage tank, and the fixed piston is fixed at the top of the reducing through hole and is in sealing connection with the reducing through hole.

As the optimization of the technical scheme, a centering ring is arranged on the inner side of the cylinder body close to the upper sealing cover, and the piston rod is fixed on the top of the inner cavity of the cylinder body through the centering ring; and a rubber ring is embedded on the side wall of the lower end of the core barrel and used for righting the core to move upwards along the core barrel.

Preferably, as above-mentioned technical scheme, the liquid storage pot is close to one side of core and is installed the top cap, is close to at the core piston push rod one side is provided with down the top cap, go up the top cap and all have sharp taper protruding with lower top cap to respectively with the upper surface and the lower surface of sharp taper protruding contact core.

On the other hand, the invention also provides a method for realizing the film-forming coring while drilling by adopting the film-forming while drilling simulation device, which comprises the following steps:

an experiment preparation stage: assembling the film-forming while drilling simulation device; calculating the amount of film-forming components required for forming quality-guaranteeing film-forming solutions with different thicknesses, separating the amount of the mixed film-forming components capable of undergoing a curing reaction into a film-forming solution A and a film-forming solution B, and respectively placing the film-forming solution A and the film-forming solution B into variable-diameter through holes of a liquid storage tank; finally, medium liquid is filled into the barrel cavity from the barrel liquid injection port, and the temperature and the pressure in the barrel are maintained at the experiment set values through a heating device and a high-pressure pump so as to simulate a real in-situ environment;

the experimental process stage: pumping hydraulic oil into the barrel body through the oil pumping hole, driving the piston push rod to move upwards, so that the piston push rod pushes the rock core and the liquid storage tank to move upwards along the rock core barrel until the reducing through hole containing the film forming liquid A and the film forming liquid B is communicated with the drainage channel, so that the film forming liquid A and the film forming liquid B flow into the drainage channel to be converged and uniformly mixed by the static mixer, then flow into an annular gap between the rock core and the inner wall of the rock core barrel, displace medium liquid in the annular gap, and form quality-guaranteeing film forming liquid with a curing film forming function around the rock core;

and (3) at the end stage of the experiment: after the rock core completely enters the rock core barrel, the quality-guaranteeing film-forming liquid completely covers the rock core; after the quality-guaranteeing film-forming liquid is subjected to chemical reaction for a certain time, a solid quality-guaranteeing sealing film with uniform texture and good barrier property is formed on the surface of the rock core, and then the film-forming coring experiment while drilling is completed.

As described above, the present invention has at least the following advantages over the prior art:

1. the simulation device for film formation while drilling is used for researching the problem that the in-situ quality of a rock core is affected because the conventional coring device cannot achieve complete quality-guaranteeing coring, film-forming components which generate curing reaction in formed quality-guaranteeing film-forming liquid are separated and are respectively stored in a liquid storage tank of a rock core barrel in the form of the film-forming liquid A and the film-forming liquid B, the curing time of the quality-guaranteeing film-forming liquid is regulated and controlled to carry out an experiment, the inner cavity of the barrel is filled with medium liquid to restore the underground in-situ fluid environment, the heating device and the high-pressure pump are connected to maintain the temperature and the pressure in the cavity at the set values of the experiment so as to simulate the in-situ real temperature and pressure environment, and a powerful technical support can be provided for the quality-guaranteeing coring on the.

2. The simulation device for forming the film while drilling blocks the communication between the diameter-variable through hole filled with the film forming solution A and the film forming solution B and the drainage channel before an experiment through the position design of the floating piston and the drainage channel; in the experimental process, the reducing through hole filled with the film-forming solution A and the film-forming solution B is communicated with the drainage channel, the two liquids can be mixed in the drainage channel within a controllable time, flow to the rock core after mixing and form the quality-guaranteeing film-forming solution solidified and formed into a film around the extracted rock core within a certain time, the on-site quality-guaranteeing coring process can be reliably simulated, and the purpose of storing and coring in situ can be achieved.

3. The device for simulating the film formation while drilling comprises a static mixer, a drainage channel, a quality-guaranteeing film-forming liquid, a solid sealing film and a drilling fluid, wherein the drainage channel and the static mixer are designed to enable two streams of liquid to be cut, sheared, rotated and re-mixed to flow into an annular gap between an extracted rock core and the inner wall of a rock core barrel after the film-forming liquid A and the film-forming liquid B flow into the drainage channel and are mixed by the static mixer, the two streams of liquid flow into the annular gap around the extracted rock core after the fluids are well dispersed and fully mixed, the quality-guaranteeing film-forming liquid with better quality can be formed around the rock core, the quality-guaranteeing film-forming liquid is solidified on the surface of the rock core after a certain time of chemical reaction to form a solid sealing film with uniform quality and good barrier property, the resource evaluation distortion caused by the loss, and further lays a better foundation for scientific exploration and research of deep rocks, and has good popularization and use values.

Drawings

The invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which

FIG. 1 is a schematic assembly diagram of a simulation device for film formation while drilling provided by an embodiment of the invention before an experiment;

FIG. 2 is a schematic cross-sectional view taken along the direction A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a simulation apparatus for film formation while drilling provided in an embodiment of the present invention at an experimental process stage;

FIG. 4 is a schematic cross-sectional view taken along the direction B-B in FIG. 3 according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the region C in FIG. 3 according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a film formation while drilling simulation apparatus provided in an embodiment of the present invention after an experiment is completed.

Description of reference numerals: 1-lower sealing cover; 2-piston push rod; 3-lower top cover; 4-a core; 5-a righting cylinder; 6-a rubber ring; 7-upper top cover; 8-a static mixer; 9-plugging; 10-a floating piston; 11-a core barrel; 12-a liquid storage tank; 13-a stationary piston; 14-a piston rod; 15-covering by a sealing cover; 16-hydraulic oil; 17-a medium liquid; 18-a variable diameter through hole; 19-a cylinder body; 20-a righting ring; 21-pump oil hole; 22-liquid injection port; 23-a liquid discharge port; 24-a drain channel; 25-a liquid flow channel; 26-annular gap; 27-limiting boss; 28-media overflow hole; 29-pointed conical protrusions.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.