CN109403936B - Process method and device for sealing high-temperature and high-pressure leakage well - Google Patents
Process method and device for sealing high-temperature and high-pressure leakage well Download PDFInfo
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- CN109403936B CN109403936B CN201811357523.6A CN201811357523A CN109403936B CN 109403936 B CN109403936 B CN 109403936B CN 201811357523 A CN201811357523 A CN 201811357523A CN 109403936 B CN109403936 B CN 109403936B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention provides a process method and a device for sealing a high-temperature high-pressure leakage well, wherein the process method comprises the following steps: filling quartz sand into the high-temperature high-pressure leakage well, wherein the upper boundary of the quartz sand forms a newly-built well bottom; injecting a first cooling liquid into the high-temperature high-pressure leakage well; connecting a ground pipeline, and carrying out pressure test on the oil pipe and the sleeve through the ground pipeline; when the temperature of the newly manufactured well bottom is reduced to a first preset temperature and the oil pipe and the sleeve are tested to a preset pressure value and are kept free from puncture, injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe; injecting a second cooling liquid into the high-temperature high-pressure leakage well; and when the temperature of the newly built well bottom is reduced to a second preset temperature and the high-temperature pre-plugging agent is initially solidified, injecting the high-temperature plugging agent into the high-temperature high-pressure leakage well. The technical method and the device for sealing the high-temperature high-pressure leakage well can meet the technical requirement of the high-temperature high-pressure leakage well on sealing channeling.
Description
Technical Field
The invention relates to the technical field of disposal processes of a leakage well, in particular to a process method and a device for sealing a high-temperature and high-pressure leakage well.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the middle and later stages of heavy oil recovery using steam stimulation and steam flooding techniques, formation steam may form fingering and gas channeling between the formations due to multiple rounds of steam stimulation and long-term steam flooding. In addition, the casing of the well may be damaged after a long period of operation and lost. Or the cementing cement sheath outside the casing pipe fails due to long-term high-temperature and high-pressure erosion to form the pipe outside channeling. The above is the situation of high temperature and high pressure loss which may occur in the process of thick oil exploitation. Thus, the subsequent injection of high temperature, high pressure steam may carry natural gas and H from the well2The S gas is blown out of the ground through the outer pipe channeling channel and/or the sleeve loss leak point to generate explosion or poison people. If large-area air leakage on the ground is formed, some production wells have to be shut down, even partial blocks can be shut down, which causes serious influence on the recovery and production of the heavy oil and also causes serious harm to human safety and environmental pollution. Therefore, it is necessary to perform a seal-and-breakthrough measure for these high-temperature and high-pressure lost circulation wells.
However, the temperatures in the wellbores of such lost circulation wells are typically high and the wellhead is often accompanied by oil casing pressure. The conventional seal channeling sealing process is usually only suitable for wells with low temperature, no oil layer leakage and zero wellhead oil casing pressure. Therefore, the conventional seal channeling sealing process cannot meet the process requirement of the high-temperature high-pressure leakage well on seal channeling.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
Based on the foregoing defects in the prior art, embodiments of the present invention provide a method and an apparatus for performing seal-up channeling on a high-temperature and high-pressure lost circulation well, which can meet the process requirements of the high-temperature and high-pressure lost circulation well for seal-up channeling.
In order to achieve the above object, the present invention provides the following technical solutions.
A process method for sealing a high-temperature high-pressure leakage well and sealing channeling comprises the following steps:
filling quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, wherein the quartz sand fills and occupies a first volume space between the artificial bottom of the high-temperature and high-pressure leakage well and the upper boundary of a leakage oil layer of the oil pipe, and part of the quartz sand is extruded into the leakage oil layer; at the moment, a newly built bottom hole is formed at the upper boundary of the quartz sand;
injecting a first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
connecting a ground pipeline, and carrying out pressure test on the oil pipe and the sleeve pipe through the ground pipeline;
when the temperature of the newly manufactured well bottom is reduced to a first preset temperature, and the oil pipe and the sleeve are tested to a preset pressure value and are kept free from puncture, injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe, wherein the high-temperature pre-plugging agent is extruded into the leakage oil layer;
injecting a second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
and when the temperature of the newly-built well bottom is reduced to a second preset temperature and the high-temperature pre-plugging agent is initially set, injecting the high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe, and extruding the high-temperature plugging agent into the leakage oil layer.
Preferably, in the step of filling the high-temperature and high-pressure leakage well with quartz sand through an oil pipe, the filling amount of the quartz sand is obtained according to the following formula:
W＝V*1.6*1000；
wherein W is the single-well dosage of the quartz sand, kg; v is the volume of the first volume space, m3。
Preferably, in the step of injecting the first cooling liquid or the second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe, the dosage V of the first cooling liquid or the second cooling liquidCold＝V1+V2，V1Volume of first or second cooling fluid entering said thief oil reservoir, V2The volume of a second volume space between the oil pipe and the upper boundary of the leakage oil layer is positioned between the wellhead of the high-temperature high-pressure leakage well;
v when the temperature of the newly manufactured well bottom is within a first threshold range1＝πr2ΦH；
V when the temperature of the newly manufactured well bottom is within a second threshold range1＝1.5πr2ΦH；
Wherein the minimum value of the second threshold range is greater than or equal to the maximum value of the first threshold range, r is the radius of the lost oil layer, m; Φ is the porosity,%, of the lost oil layer; h is the effective thickness of the oil leakage layer, m.
Preferably, in the step of injecting the high-temperature and high-pressure pre-plugging agent into the high-temperature and high-pressure leakage well through the oil pipe, a first displacement fluid is adopted to displace the high-temperature pre-plugging agent, the usage amount of the first displacement fluid is smaller than a first reserved volume, and the first reserved volume is a space volume between a well mouth of the high-temperature and high-pressure leakage well and a first reserved depth of the high-temperature pre-plugging agent of the oil pipe.
Preferably, in the step of injecting the high-temperature and high-pressure leakage well with the high-temperature pre-plugging agent through the oil pipe, the usage amount of the high-temperature pre-plugging agent is equal to the volume of the casing pipe between the lower boundary of the leakage oil layer and a preset distance above the upper boundary of the leakage oil layer.
Preferably, in the step of injecting the high-temperature pre-plugging agent into the high-temperature and high-pressure leakage well through the oil pipe, the leakage oil layer is pre-plugged by adopting a first pre-plugging agent and a second pre-plugging agent as a first slug and a second slug.
Preferably, the first pre-plugging agent is phenolic resin, and the second pre-plugging agent is G-grade superfine cement.
Preferably, in the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe, a second displacement fluid is adopted to displace the high-temperature plugging agent, the use amount of the second displacement fluid is smaller than a second reserved volume, and the second reserved volume is the space volume between the well mouth of the high-temperature and high-pressure leakage well and the second reserved depth of the high-temperature plugging agent.
Preferably, in the step of injecting the high-temperature plugging agent into the high-temperature high-pressure loss-leakage well through the oil pipe, the amount of the high-temperature plugging agent is obtained according to the following formula:
Vplug＝πr2ΦH；
Wherein r is the radius of the lost oil layer, m; Φ is the porosity,%, of the lost oil layer; h is the effective thickness of the oil leakage layer, m.
Preferably, after the high-temperature plugging agent is subjected to waiting for a first preset time, the high-temperature plugging agent is pressed into the oil pipe, after a second preset time, the pressure drop in the oil pipe is detected, and whether the sealing channeling sealing process is qualified or not is judged according to the pressure drop.
Preferably, when the pressure drop is less than or equal to a preset threshold value, the seal channeling process is judged to be qualified, and the seal channeling process operation of the high-temperature high-pressure leakage well is completed.
Preferably, when the pressure drop is greater than a preset threshold value, judging that the seal channeling sealing process is unqualified; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
A process unit for carrying out seal and channeling on a high-temperature and high-pressure leakage well comprises the following steps:
the quartz sand filling module is used for filling quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, the quartz sand fills and occupies a first volume space between the artificial bottom of the high-temperature and high-pressure leakage well and the upper boundary of a leakage oil layer of the oil pipe, and part of the quartz sand is extruded into the leakage oil layer; at the moment, a newly built bottom hole is formed at the upper boundary of the quartz sand;
the first cooling liquid injection module is used for injecting first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
the pressure test module is used for connecting a ground pipeline and testing the pressure of the oil pipe and the sleeve pipe through the ground pipeline;
the high-temperature pre-plugging agent injection module is used for injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly manufactured well bottom is reduced to a first preset temperature and the oil pipe and the sleeve are tested to preset pressure values and are kept free from puncture, and the high-temperature pre-plugging agent is extruded into the leakage oil layer;
the second cooling liquid injection module is used for injecting second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
and the high-temperature plugging agent injection module is used for injecting a high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly-built well bottom is reduced to a second preset temperature and the high-temperature plugging agent is initially set, and the high-temperature plugging agent is extruded into the leakage oil layer.
Preferably, the method further comprises the following steps: and the pressurizing detection module is used for pressurizing the high-temperature plugging agent into the oil pipe after the high-temperature plugging agent is subjected to condensation for a first preset time, detecting the pressure drop in the oil pipe after the high-temperature plugging agent is subjected to condensation for a second preset time, and judging whether the sealing channeling sealing process is qualified or not according to the pressure drop.
Preferably, the method further comprises the following steps: and the first judgment module is used for judging that the seal channeling process is qualified when the pressure drop is less than or equal to a preset threshold value, and finishing the seal channeling process operation of the high-temperature and high-pressure leakage well.
Preferably, the method further comprises the following steps: the second judging module is used for judging that the seal channeling sealing process is unqualified when the pressure drop is larger than a preset threshold value; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
According to the technical method for sealing the high-temperature high-pressure leakage well, quartz sand is filled into the high-temperature high-pressure leakage well to serve as a framework, and the leakage oil layer is initially plugged, so that the leakage amount of a subsequently injected high-temperature pre-plugging agent can be reduced, and then the high-temperature pre-plugging agent injected into the high-temperature high-pressure leakage well forms primary pre-plugging, so that a large pore passage at the bottom of the well can be effectively plugged, the leakage amount of a stratum can be effectively reduced, and therefore the final plugging of the leakage oil layer can be preferably realized by the subsequently injected high-temperature pre-plugging agent into the high-temperature high-pressure leakage well. The materials adopted by the process method for sealing the high-temperature and high-pressure leakage well have better high-temperature and high-pressure resistance, so that the process method for sealing the high-temperature and high-pressure leakage well can meet the process requirement of the high-temperature and high-pressure leakage well on sealing channeling.
The process method and the device for sealing the high-temperature and high-pressure leakage well, provided by the embodiment of the invention, have the following beneficial technical effects:
(1) by filling the quartz sand as the framework, the loss at the bottom of the well during high-temperature pre-plugging can be reduced.
(2) The high-temperature pre-plugging agent is used for pre-plugging in a first slug mode and a second slug mode, so that the plugging of a large pore passage at the bottom of a well is facilitated, the leakage of the stratum can be effectively reduced, and a good foundation is laid for the subsequent implementation of high-temperature plugging.
(3) Before the working procedures of high-temperature pre-plugging and high-temperature plugging, cooling liquid is injected into the high-temperature high-pressure leakage well, so that temperature gradient distribution is formed in the high-temperature high-pressure leakage well, the high-temperature pre-plugging agent and the high-temperature plugging agent can smoothly enter a leakage oil layer, sufficient injection time is created for the high-temperature pre-plugging agent and the high-temperature plugging agent, the time for pumping the high-temperature pre-plugging agent and the high-temperature plugging agent in a shaft can be controlled, and early solidification and enema can be avoided. Meanwhile, the method is also beneficial to the diameter shrinkage and solidification of the high-temperature pre-plugging agent and the high-temperature plugging agent in oil pipes and sleeves.
(4) When high-temperature pre-plugging and high-temperature plugging are carried out, a certain amount of leakage amount is reserved for the high-temperature pre-plugging agent and the high-temperature plugging agent respectively, the accuracy of the position of a plugging interface required to be reserved in the construction process is facilitated, and the effectiveness of the high-temperature pre-plugging and the high-temperature plugging is ensured.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:
FIG. 1 is a flow chart of a process for seal channeling of a high temperature and high pressure lost circulation well in accordance with an embodiment of the present invention;
fig. 2 is a block diagram of a process device for sealing a high-temperature high-pressure lost circulation well according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a flow chart of a process for seal-by-seal of a high temperature and high pressure lost circulation well in accordance with an embodiment of the present invention. Although the present invention provides method steps as described in the following examples or flowcharts, more or fewer steps may be included in the method, with or without the assistance of inventive faculty. Moreover, the method logically lacks the necessary causal steps, and the order of execution of these steps is not limited to the order of execution provided in the embodiments of the present invention. Specifically, the process method for sealing the high-temperature and high-pressure leakage well by using the seal channeling method of the embodiment comprises the following steps:
step S10: filling quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, wherein the quartz sand fills and occupies a first volume space between the artificial bottom of the high-temperature and high-pressure leakage well and the upper boundary of a leakage oil layer of the oil pipe, and part of the quartz sand is extruded into the leakage oil layer; at the moment, a newly built bottom hole is formed at the upper boundary of the quartz sand;
step S20: injecting a first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
step S30: connecting a ground pipeline, and carrying out pressure test on the oil pipe and the sleeve pipe through the ground pipeline;
step S40: when the temperature of the newly manufactured well bottom is reduced to a first preset temperature, and the oil pipe and the sleeve are tested to a preset pressure value and are kept free from puncture, injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe, wherein the high-temperature pre-plugging agent is extruded into the leakage oil layer;
step S50: injecting a second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
step S60: and when the temperature of the newly-built well bottom is reduced to a second preset temperature and the high-temperature pre-plugging agent is initially set, injecting the high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe, and extruding the high-temperature plugging agent into the leakage oil layer.
In the technical field of seal and channeling of a thick oil leakage well, the underground temperature is generally considered as high temperature when the underground temperature is more than 100 ℃, and the pressure reaches more than 3MPa and is considered as high pressure.
In this embodiment, quartz sand is filled into the high-temperature and high-pressure leaking well through the oil pipe as a framework to form a preliminary plugging to the leaking oil layer, so as to reduce the leakage amount of the high-temperature pre-plugging agent when the high-temperature pre-plugging process is performed in the subsequent step S40. Because the quartz sand has better temperature and pressure resistance, the quartz sand can still keep the inherent strength property although the temperature and the pressure in the high-temperature and high-pressure leakage well are higher before the filling process of the quartz sand is carried out.
The filling amount of the quartz sand is required to meet the condition that after the filling is finished, the upper boundary of the quartz sand reaches the upper boundary of the leaked oil layer, so that the upper boundary of the quartz sand forms a newly-built well bottom. Specifically, the filling amount of the quartz sand can be obtained according to W ═ V × 1.6 × 1000. Wherein W is the single well dosage (kg) of the quartz sand, and V is the volume (m) of the first volume space3). The volume V of the first volume space is pi rOil 2h1Wherein r isOilIs the inner diameter (m), h) of the oil pipe1The height (m) from the artificial bottom of the high-temperature high-pressure leakage well to the upper boundary of the leakage oil layer.
In the whole process, a differential tester is used for measuring the temperature of the newly built well bottom. The newly built bottom of the high-temperature high-pressure leakage well has a higher temperature return speed, and the pressure in the well is generally higher. Therefore, before the high-temperature pre-plugging process of step S40 is performed, the temperature reduction process of step S20 needs to be performed on the wellbore of the lost circulation well to prevent the high-temperature pre-plugging agent from being solidified in advance.
Because of the large specific heat capacity of water, the first cooling liquid is preferably water, and the amount V of the waterCold＝V1+V2. Wherein, V1Volume of first cooling fluid into oil-leaking layer, V2The volume of a second volume space between the wellhead of the high-temperature high-pressure leakage well and the upper boundary of the leakage oil layer is the volume of the oil pipe.
When the temperature of the newly built well bottom measured by the differential tester is within a first threshold value range, V1＝πr2Φ H. And when the temperature of the newly built well bottom measured by the differential tester is within a second threshold value range, V1＝1.5πr2Φ H. Wherein the minimum value of the second threshold range is greater than or equal to the maximum value of the first threshold range, e.g., [100, 200 ]]The first threshold range is [200, 240 ]]. r is the radius (m) of the lost oil layer, Φ is the porosity (%) of the lost oil layer, and H is the effective thickness (m) of the lost oil layer. The volume V of the second volume space is pi rOil 2h2Wherein r isOilIs the inner diameter (m), h) of the oil pipe2The height (m) from the wellhead of the high-temperature high-pressure leakage well to the upper boundary of the leakage oil layer.
When the temperature of the newly manufactured well bottom is measured by the differential tester to be reduced to the first preset temperature suitable for subsequent operation, the first cooling liquid injection process of the step S20 is considered to achieve the preset temperature reduction effect, and the temperature condition of the high-temperature pre-plugging process of the step S40 is met.
In this embodiment, the first preset temperature is lower than the minimum value of the first threshold range, so as to provide sufficient injection time for the high-temperature pre-plugging agent and avoid the high-temperature pre-plugging agent from being solidified during the injection process. Therefore, the first preset temperature is set freely according to the actual situation, and may be, for example, 70-80 ℃, and the invention is not limited thereto.
In addition, before the high-temperature pre-plugging process of step S40 is performed, the pressure test process of step S30 needs to be performed on the oil pipe and the casing. The purpose of performing pressure test on the oil pipe and the casing pipe is to know whether the quartz sand filling process of step S10 is performed to achieve a predetermined preliminary plugging effect.
Specifically, for example, when the pressure of the oil pipe and the casing pipe is tested to 20MPa, it is considered that the quartz sand filling process of step S10 achieves the predetermined preliminary plugging effect, and the pressure condition of the high-temperature pre-plugging process of step S40 is satisfied.
And (4) when the temperature and pressure conditions required for implementing the high-temperature pre-plugging agent process of the step S40 are met, injecting the high-temperature pre-plugging agent into the high-temperature high-pressure leakage well.
In this embodiment, the high-temperature pre-plugging agent is injected into the high-temperature high-pressure lost circulation well in a manner that the high-temperature pre-plugging agent is replaced by the first replacement fluid. The first displacement fluid may specifically be water. And the using amount of the first displacement fluid is smaller than a first reserved volume, and the first reserved volume is the space volume between the wellhead of the high-temperature high-pressure leakage well and the first reserved depth of the high-temperature pre-plugging agent of the oil pipe. Therefore, a certain leakage amount is reserved in the high-temperature pre-plugging process, and the accuracy of the plugging interface position can be ensured.
In this embodiment, the first reserved depth of the high-temperature pre-plugging agent is a theoretical distance value between the plugging interface at the upper end of the high-temperature pre-plugging agent and the wellhead of the high-temperature high-pressure leakage well after the high-temperature pre-plugging agent is injected. Generally, due to the requirement of plugging quality, the high temperature pre-plugging agent is injected, and the plugging interface at the upper end of the high temperature pre-plugging agent is higher than the upper limit of the lost oil layer by a predetermined height, for example, 30 m.
However, leakage can also occur after the high temperature pre-plugging agent enters the lost oil reservoir. Therefore, when the amount of the first displacement fluid is calibrated according to the theoretical distance value, the plugging interface at the upper end of the high-temperature pre-plugging agent may be lowered after the injection of the high-temperature pre-plugging agent is completed. For example, the plugging interface at the upper end of the high-temperature pre-plugging agent is only 10m higher than the upper boundary of the oil leakage layer, and even the plugging interface is reduced to be lower than the upper boundary of the oil leakage layer, so that the pre-plugging agent loses the plugging effect.
In the embodiment of the invention, the dosage of the first displacement fluid is designed to be smaller than the first reserved volume, so that after injection is completed, the distance between the upper end plugging interface of the high-temperature pre-plugging agent and the wellhead of the high-temperature high-pressure leakage well can be kept to be a large value, for example, the upper end plugging interface of the high-temperature pre-plugging agent is 50m higher than the upper boundary of a leakage oil layer. Therefore, even if a certain amount of leakage occurs after the high-temperature pre-plugging agent enters the leakage oil layer, the final plugging upper limit of the high-temperature pre-plugging agent is higher than the upper limit of the leakage oil layer, and the success of pre-plugging is ensured.
The amount of the high-temperature pre-plugging agent can be calculated according to the volume of the casing between the lower boundary of the leaked oil layer and a preset distance above the upper boundary of the leaked oil layer, namely the amount of the high-temperature pre-plugging agent is equal to the volume between the lower boundary of the leaked oil layer and the preset distance above the upper boundary of the leaked oil layer. The predetermined distance may be freely set according to actual conditions, for example, may be 10m, which is not limited in the present invention.
In addition, the injection time of the high temperature pre-plugging agent is critical. When the newly built well bottom is subjected to temperature return, the temperatures corresponding to different time points are different, and the initial setting time of the high-temperature pre-plugging agent corresponding to different temperatures is also different. Therefore, the injection time of the high-temperature pre-plugging agent is determined at the temperature return speed of the newly manufactured well bottom measured by the differential tester and at different temperatures corresponding to different time points, but the injection time of the high-temperature pre-plugging agent needs to be controlled within the initial setting time of the corresponding high-temperature pre-plugging agent.
In the high-temperature pre-plugging step of step S40, it is preferable to pre-plug the leaking oil layer by using the first pre-plugging agent and the second pre-plugging agent as the first slug and the second slug. The first pre-plugging agent and the second pre-plugging agent are preferably phenolic resin and G-grade superfine cement respectively so as to meet the requirements of underground high-temperature and high-pressure environment construction.
In addition, the mode that the first pre-plugging agent and the second pre-plugging agent are used as the first slug and the second slug is beneficial to the blockage of a large pore passage at the bottom of the well, can effectively reduce the leakage amount of the stratum, and lays a good foundation for the subsequent high-temperature plugging process of the step S60. Meanwhile, the phenolic resin and the G-grade superfine cement have the characteristics of high temperature resistance and high pressure resistance, and can meet the operation requirements of temperature and pressure in a shaft of a leakage well.
Similarly, to avoid premature solidification of the high-temperature plugging agent, the wellbore of the lost circulation well needs to be subjected to the temperature lowering process of step S50 before the high-temperature plugging process of step S60 is performed. The nature and amount of the second cooling liquid can be referred to the description of the first cooling liquid, and are not repeated herein.
When the temperature of the newly manufactured well bottom measured by the differential tester is changed to the second preset temperature suitable for subsequent operation, the second cooling liquid injection process of the step S50 is considered to achieve the preset cooling effect, and the temperature condition of the high-temperature plugging process of the step S60 is met. Similarly, the second predetermined temperature may refer to the description of the first predetermined temperature, which is not repeated herein.
Further, another condition for performing the high temperature plugging step of step S60 is that the high temperature pre-plugging agent of step S40 is in an initial setting state, specifically, that the G-grade ultra-fine cement as the second plug is in an initial setting state. And when the temperature and the initial setting conditions are met, injecting a high-temperature plugging agent into the high-temperature high-pressure leakage well.
In this embodiment, the high-temperature plugging agent is injected into the high-temperature high-pressure lost circulation well in such a manner that the high-temperature plugging agent is replaced by the second displacement fluid. The second displacement fluid may specifically be water. And the using amount of the second displacement fluid is smaller than a second reserved volume, and the second reserved volume is the space volume between the wellhead of the high-temperature high-pressure leakage well and the second reserved depth of the high-temperature plugging agent of the oil pipe. Therefore, a certain leakage amount is reserved in the high-temperature plugging process, and the accuracy of the plugging interface position is ensured. Similarly, the second reserved volume can refer to the description of the first reserved volume, and the present invention is not described herein again.
In this embodiment, the amount of the high temperature plugging agent can be determined according to VPlug＝πr2Φ H. Wherein r is the radius (m) of the lost oil layer, phi is the porosity (%) of the lost oil layer, and H is the effective thickness (m) of the lost oil layer.
Also, the injection time of the high temperature blocking agent is critical. The specific injection time can refer to the above description of the injection time of the high-temperature pre-plugging agent, and is not described herein again.
And (4) finishing the processes from the step (S10) to the step (S60), and finishing the sealing and channeling operation of the high-temperature and high-pressure leakage well for one round. At this time, the effect of the seal channeling operation of one round can be checked. As shown in fig. 1, the specific verification operation is as follows:
step S70: and after the high-temperature plugging agent is subjected to gel waiting for a first preset time, pressing the high-temperature plugging agent into the oil pipe, detecting the pressure drop in the oil pipe after a second preset time, and judging whether the sealing channeling sealing process is qualified or not according to the pressure drop.
In this embodiment, the first predetermined time period for the high-temperature plugging agent to be set and the second time period after the high-temperature plugging agent to be pressed may be set according to actual conditions, for example, 24h and 30min may be set, and the present invention is not limited thereto. And (3) pressurizing the oil pipe to a preset pressure value, for example, 15MPa, detecting the pressure drop delta P in the oil pipe by using a pressure detection device after second preset time, and judging whether the seal channeling process is qualified or not according to the pressure drop delta P. The specific judgment method is as follows:
step S701: and when the pressure drop is less than or equal to a preset threshold value, judging that the seal channeling process is qualified, and finishing the seal channeling process operation of the high-temperature high-pressure leakage well.
Step S702: when the pressure drop is greater than a preset threshold value, judging that the seal channeling sealing process is unqualified; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
In this embodiment, the preset threshold may be set according to actual conditions, for example, may be 0.5MPa, which is not limited in the present invention. When the pressure drop Δ P is less than or equal to 0.5MPa, it is considered that the oil leakage layer of the high-temperature high-pressure leakage well is effectively blocked after the steps S10 to S60 are performed. At the moment, the operation of the sealing channeling process of the whole high-temperature high-pressure leakage well can be finished.
And if the pressure drop delta P is larger than 0.5MPa, namely after one round of sealing and channeling operation is carried out, the leakage oil layer of the high-temperature and high-pressure leakage well may not be effectively blocked. At this time, the high temperature plugging process of step S60 may be repeated, and then the pressure test and detection operation of step S70 may be performed again to check the plugging effect again until the pressure drop Δ P is reduced to be less than or equal to the preset threshold value.
According to the technical method for sealing the high-temperature high-pressure leakage well, quartz sand is filled into the high-temperature high-pressure leakage well to serve as a framework, and the leakage oil layer is initially plugged, so that the leakage amount of a subsequently injected high-temperature pre-plugging agent can be reduced, and then the high-temperature pre-plugging agent injected into the high-temperature high-pressure leakage well forms primary pre-plugging, so that a large pore passage at the bottom of the well can be effectively plugged, the leakage amount of a stratum can be effectively reduced, and therefore the final plugging of the leakage oil layer can be preferably realized by the subsequently injected high-temperature pre-plugging agent into the high-temperature high-pressure leakage well. The materials adopted by the process method for sealing the high-temperature and high-pressure leakage well have better high-temperature and high-pressure resistance, so that the process method for sealing the high-temperature and high-pressure leakage well can meet the process requirement of the high-temperature and high-pressure leakage well on sealing channeling.
The process method for sealing the high-temperature and high-pressure leakage well by using the seal channeling in the embodiment of the invention has the following beneficial technical effects:
(1) by filling the quartz sand as the framework, the loss at the bottom of the well during high-temperature pre-plugging can be reduced.
(2) The high-temperature pre-plugging agent is used for pre-plugging in a first slug mode and a second slug mode, so that the plugging of a large pore passage at the bottom of a well is facilitated, the leakage of the stratum can be effectively reduced, and a good foundation is laid for the subsequent implementation of high-temperature plugging.
(3) Before the working procedures of high-temperature pre-plugging and high-temperature plugging, cooling liquid is injected into the high-temperature high-pressure leakage well, so that temperature gradient distribution is formed in the high-temperature high-pressure leakage well, the high-temperature pre-plugging agent and the high-temperature plugging agent can smoothly enter a leakage oil layer, sufficient injection time is created for the high-temperature pre-plugging agent and the high-temperature plugging agent, the time for pumping the high-temperature pre-plugging agent and the high-temperature plugging agent in a shaft can be controlled, and early solidification and enema can be avoided. Meanwhile, the method is also beneficial to the diameter shrinkage and solidification of the high-temperature pre-plugging agent and the high-temperature plugging agent in oil pipes and sleeves.
(4) When high-temperature pre-plugging and high-temperature plugging are carried out, a certain amount of leakage amount is reserved for the high-temperature pre-plugging agent and the high-temperature plugging agent respectively, the accuracy of the position of a plugging interface required to be reserved in the construction process is facilitated, and the effectiveness of the high-temperature pre-plugging and the high-temperature plugging is ensured.
Based on the same concept, an embodiment of the invention also provides a process device for sealing the high-temperature and high-pressure leakage well, and the process device is described in the following embodiments. Due to the fact that the principle of solving the problems of the process device for sealing the high-temperature and high-pressure leakage well and the technical effect which can be obtained by the process device are similar to the process method for sealing the high-temperature and high-pressure leakage well, the implementation of the process device for sealing the high-temperature and high-pressure leakage well can refer to the implementation of the process method for sealing the high-temperature and high-pressure leakage well, and repeated parts are not repeated. The term "module" used below may be implemented based on software, or based on hardware, or implemented by a combination of software and hardware.
Referring to fig. 2, a process apparatus for sealing a high-temperature high-pressure leakage well according to an embodiment of the present invention includes: the device comprises a quartz sand filling module 10, a first cooling liquid injection module 20, a pressure test module 30, a high-temperature pre-plugging agent injection module 40, a second cooling liquid injection module 50 and a high-temperature plugging agent injection module 60. Wherein the content of the first and second substances,
the quartz sand filling module 10 may be configured to fill quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, where the quartz sand fills and occupies a first volume space between an artificial bottom of the high-temperature and high-pressure leakage well and an upper boundary of a leakage oil layer, and a part of the quartz sand is squeezed into the leakage oil layer; at this point, the upper boundary of the silica sand forms a newly built bottom hole.
The first cooling liquid injection module 20 is used for injecting first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe.
The pressure test module 30 is used for connecting a ground pipeline, and the ground pipeline is used for testing the pressure of the oil pipe and the sleeve.
The high-temperature pre-plugging agent injection module 40 is used for injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly-manufactured well bottom is reduced to a first preset temperature and the oil pipe and the casing pipe are tested to preset pressure values and are kept without puncture, and the high-temperature pre-plugging agent is extruded into the leakage oil layer.
The second cooling liquid injection module 50 is used for injecting a second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe.
The high-temperature plugging agent injection module 60 is used for injecting a high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly-built well bottom is reduced to a second preset temperature and the high-temperature plugging agent is initially set, and the high-temperature plugging agent is extruded into the leakage oil layer.
Further, in a preferred embodiment, the process device for sealing and channeling the high-temperature high-pressure leakage well further comprises: the device comprises a pressing detection module 70, a first judgment module 701 and a second judgment module 702. Wherein the content of the first and second substances,
and the pressurizing detection module 70 is used for pressurizing the high-temperature plugging agent into the oil pipe after the high-temperature plugging agent is subjected to waiting for a first preset time, detecting the pressure drop in the oil pipe after a second preset time, and judging whether the sealing channeling sealing process is qualified according to the pressure drop.
The first judging module 701 is configured to judge that the seal channeling process is qualified when the pressure drop is less than or equal to a preset threshold value, and complete the seal channeling process operation of the high-temperature and high-pressure leakage well.
The second judging module 702 is configured to judge that the seal channeling sealing process is not qualified when the pressure drop is greater than a preset threshold; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 21 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.
Claims (15)
1. A process method for sealing a high-temperature high-pressure leakage well and sealing channeling is characterized by comprising the following steps:
filling quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, wherein the quartz sand fills and occupies a first volume space between the artificial bottom of the high-temperature and high-pressure leakage well and the upper boundary of a leakage oil layer of the oil pipe, and part of the quartz sand is extruded into the leakage oil layer; at the moment, a newly built bottom hole is formed at the upper boundary of the quartz sand;
injecting a first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
connecting a ground pipeline, and carrying out pressure test on the oil pipe and the sleeve pipe through the ground pipeline;
when the temperature of the newly manufactured well bottom is reduced to a first preset temperature, and the oil pipe and the sleeve are tested to a preset pressure value and are kept free from puncture, injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe, wherein the high-temperature pre-plugging agent is extruded into the leakage oil layer;
injecting a second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
when the temperature of the newly manufactured well bottom is reduced to a second preset temperature and the high-temperature pre-plugging agent is initially solidified, injecting a high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe, and extruding the high-temperature plugging agent into the leakage oil layer; and replacing the high-temperature pre-plugging agent by adopting a first replacement fluid, wherein the using amount of the first replacement fluid is less than a first reserved volume, and the first reserved volume is the space volume between the wellhead of the high-temperature high-pressure leakage well and the first reserved depth of the high-temperature pre-plugging agent.
2. The process for seal-up channeling a high-temperature high-pressure lost circulation well according to claim 1, wherein in the step of filling the high-temperature high-pressure lost circulation well with the silica sand through the oil pipe, the filling amount of the silica sand is obtained according to the following formula:
W＝V*1.6*1000；
wherein W is the single-well dosage of the quartz sand, kg; v is the volume of the first volume space, m3。
3. The process for seal-up channeling a high temperature and pressure thief well according to claim 1 wherein the first coolant or the second coolant is used in an amount V during the step of injecting the first coolant or the second coolant into the high temperature and pressure thief well through the tubingCold＝V1+V2，m3；V1M is the volume of the first coolant or the second coolant entering the thief oil reservoir3；V2M is the volume of a second volume space between the oil pipe and the upper boundary of the high-temperature high-pressure leakage oil layer3；
V when the temperature of the newly manufactured well bottom is within a first threshold range1＝πr2ΦH；
V when the temperature of the newly manufactured well bottom is within a second threshold range1＝1.5πr2ΦH；
Wherein the minimum value of the second threshold range is greater than or equal to the maximum value of the first threshold range, r is the radius of the lost oil layer, m; Φ is the porosity,%, of the lost oil layer; h is the effective thickness of the oil leakage layer, m.
4. The process for seal-layer channeling a high temperature and pressure thief well according to claim 1 wherein during the step of injecting a high temperature pre-plugging agent through the tubing into the high temperature and pressure thief well, the high temperature pre-plugging agent is used in an amount equal to the volume of the casing between the lower boundary of the thief oil reservoir and a predetermined distance above the upper boundary of the thief oil reservoir.
5. The process for seal-layer channeling of a high temperature and pressure thief well according to claim 1 wherein, in the step of injecting a high temperature pre-plugging agent into the high temperature and pressure thief well through the tubing, the thief zone is pre-plugged with a first pre-plugging agent and a second pre-plugging agent as a first slug and a second slug.
6. The process for sealing a channeling seal for a high temperature and high pressure lost circulation well according to claim 5, wherein said first pre-plugging agent is phenolic resin and said second pre-plugging agent is grade G ultra fine cement.
7. The process for seal-layer channeling of a high-temperature and high-pressure lost circulation well according to claim 1, wherein in the step of injecting the high-temperature and high-pressure plugging agent into the high-temperature and high-pressure lost circulation well through the oil pipe, a second displacement fluid is used to displace the high-temperature plugging agent, the amount of the second displacement fluid is less than a second reserved volume, and the second reserved volume is a space volume between a wellhead of the high-temperature and high-pressure lost circulation well and a second reserved depth of the high-temperature plugging agent.
8. The process for sealing a high temperature and high pressure lost circulation well against water breakthrough according to claim 1, wherein the amount of the high temperature plugging agent used in the step of injecting the high temperature and high pressure plugging agent into the high temperature and high pressure lost circulation well through the tubing is obtained according to the following formula:
Vplug＝πr2ΦH；
Wherein, VPlugVolume of high temperature blocking agent, m3(ii) a r is the radius of the lost oil layer, m; Φ is the porosity,%, of the lost oil layer; h is the effective thickness of the oil leakage layer, m.
9. The process method for sealing a high-temperature and high-pressure leakage well against channeling according to claim 1, wherein after the high-temperature plugging agent is frozen for a first predetermined time, the high-temperature plugging agent is pressurized into the oil pipe, and after a second predetermined time, the pressure drop in the oil pipe is detected, and whether the sealing channeling sealing process is qualified is judged according to the pressure drop.
10. The process method for sealing a high-temperature and high-pressure leakage well against channeling according to claim 9, wherein when the pressure drop is less than or equal to a preset threshold value, the sealing and channeling process is judged to be qualified, and the sealing and channeling process operation of the high-temperature and high-pressure leakage well is completed.
11. The process method for sealing a channeling seal of a high-temperature and high-pressure lost circulation well according to claim 9, wherein when the pressure drop is greater than a preset threshold value, the sealing channeling seal process is judged to be unqualified; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
12. A process units for carrying out seal channeling to high temperature high pressure lost circulation well, its characterized in that includes:
the quartz sand filling module is used for filling quartz sand into the high-temperature and high-pressure leakage well through an oil pipe, the quartz sand fills and occupies a first volume space between the artificial bottom of the high-temperature and high-pressure leakage well and the upper boundary of a leakage oil layer of the oil pipe, and part of the quartz sand is extruded into the leakage oil layer; at the moment, a newly built bottom hole is formed at the upper boundary of the quartz sand;
the first cooling liquid injection module is used for injecting first cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
the pressure test module is used for connecting a ground pipeline and testing the pressure of the oil pipe and the sleeve pipe through the ground pipeline;
the high-temperature pre-plugging agent injection module is used for injecting a high-temperature pre-plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly manufactured well bottom is reduced to a first preset temperature and the oil pipe and the sleeve are tested to preset pressure values and are kept free from puncture, and the high-temperature pre-plugging agent is extruded into the leakage oil layer;
the second cooling liquid injection module is used for injecting second cooling liquid into the high-temperature high-pressure leakage well through the oil pipe;
the high-temperature plugging agent injection module is used for injecting a high-temperature plugging agent into the high-temperature high-pressure leakage well through the oil pipe when the temperature of the newly-built well bottom is reduced to a second preset temperature and the high-temperature plugging agent is initially solidified, and the high-temperature plugging agent is extruded into the leakage oil layer; and replacing the high-temperature pre-plugging agent by adopting a first replacement fluid, wherein the using amount of the first replacement fluid is less than a first reserved volume, and the first reserved volume is the space volume between the wellhead of the high-temperature high-pressure leakage well and the first reserved depth of the high-temperature pre-plugging agent.
13. The process unit for seal-by-seal of a high temperature and pressure lost circulation well according to claim 12, further comprising: and the pressurizing detection module is used for pressurizing the high-temperature plugging agent into the oil pipe after the high-temperature plugging agent is subjected to condensation for a first preset time, detecting the pressure drop in the oil pipe after the high-temperature plugging agent is subjected to condensation for a second preset time, and judging whether the sealing channeling sealing process is qualified or not according to the pressure drop.
14. The process unit for seal-by-seal of a high temperature and pressure lost circulation well according to claim 13, further comprising: and the first judgment module is used for judging that the seal channeling process is qualified when the pressure drop is less than or equal to a preset threshold value, and finishing the seal channeling process operation of the high-temperature and high-pressure leakage well.
15. The process unit for seal-by-seal of a high temperature and pressure lost circulation well according to claim 13, further comprising: the second judging module is used for judging that the seal channeling sealing process is unqualified when the pressure drop is larger than a preset threshold value; and at the moment, repeatedly executing the step of injecting the high-temperature plugging agent into the high-temperature and high-pressure leakage well through the oil pipe until the pressure drop is less than or equal to the preset threshold value.
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