CN111999143A - Combined design method of solid temporary plugging material with undersize holes - Google Patents
Combined design method of solid temporary plugging material with undersize holes Download PDFInfo
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- CN111999143A CN111999143A CN202010855451.9A CN202010855451A CN111999143A CN 111999143 A CN111999143 A CN 111999143A CN 202010855451 A CN202010855451 A CN 202010855451A CN 111999143 A CN111999143 A CN 111999143A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a combined design method of a solid temporary plugging material with undersize holes, and belongs to the field of oil and gas exploitation. The combined design method of the solid temporary plugging material comprises the following steps: performing acid liquor displacement on the rock core by adopting a temporary plugging agent temporary plugging performance evaluation experimental device, forming acid-etched earthworm holes on the rock core, performing temporary plugging agent displacement on the acid-etched rock core, and performing solid temporary plugging material combination design of small-size holes according to the displacement pressure change rule; the temporary plugging agent is displaced by temporary plugging fluid prepared from carrier fluid and temporary plugging agent. According to the method, acid liquor displacement is performed on the carbonate rock core to form an acid-etched earthworm hole penetrating through the rock core, a small-size hole is simulated, and the rock core with the earthworm hole can be repeatedly used; the displacement pipeline of the temporary plugging agent is enlarged to 10mm, the temporary plugging agent is prevented from plugging the pipeline, and the carrier fluid carries the temporary plugging agent to enter the earthworm hole and is close to the actual stratum condition.
Description
Technical Field
The invention relates to a combined design method of a solid temporary plugging material with undersize holes, belonging to the field of oil and gas exploitation.
Background
Acid fracturing is a common method for increasing production and improving low-permeability carbonate reservoirs, and in acid fracturing, acid liquor flows in cracks, reacts on the surfaces of the cracks and is filtered into a stratum under the pressure difference between the inside and the outside of the cracks. Due to acid rock reaction, the filtered acid liquor erodes the stratum to form wormholes, and the acid liquor filtration is aggravated. Severe acid fluid loss is a major factor limiting the distance of action of live acid, and limiting acid fluid loss through wormholes is a major way to reduce fluid loss. The acid-etched earthworm holes are usually temporarily blocked by adopting a solid particle temporary blocking agent, and the temporary blocking effect depends on the temporary blocking material and size combination. The earthworm hole is a small-size hole, so that the temporary plugging agent is required to enter the earthworm hole on one hand, and the temporary plugging agent has a better temporary plugging effect on the other hand. Therefore, the acid fracturing design needs a temporary plugging material combination design method with undersized holes.
At present, a crack diversion trench displacement experiment is adopted for temporary plugging agent evaluation and combined design, the crack form is different from that of an acid-etched earthworm hole, and the design method cannot be used for temporary plugging agent design of the earthworm hole.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a combined design method of a solid temporary plugging material with undersize holes. According to the method, a carbonate rock core is acidized and displaced to form an acid-etched earthworm hole which is communicated from an inlet to an outlet, then the core is used for carrying out a temporary plugging agent displacement experiment, the temporary plugging agent is combined in different sizes, types and shapes, the change rule of the temporary plugging pressure is observed, and therefore the type, the size and the combination of the temporary plugging agent are optimized.
The invention firstly provides a combined design method of a solid temporary plugging material with undersize holes, which comprises the following steps:
performing acid liquor displacement on the rock core by adopting a temporary plugging agent temporary plugging performance evaluation experimental device, forming acid-etched earthworm holes on the rock core, performing temporary plugging agent displacement on the acid-etched rock core, and performing solid temporary plugging material combination design of small-size holes according to the displacement pressure change rule;
the temporary plugging agent is displaced by temporary plugging fluid prepared from carrier fluid and temporary plugging agent.
In the above-mentioned solid temporary plugging material combination design method, the temporary plugging agent temporary plugging performance evaluation experimental apparatus includes an intermediate container, a core holder and a confining pressure pump;
the middle container is connected with the rock core holder through a liquid inlet pipeline;
the confining pressure pump is connected to the core holder; the intermediate container is sequentially connected with the liquid injection pump and the liquid storage tank through pipelines; a liquid outlet of the core holder is connected with a liquid drainage pipeline, and a data acquisition system is connected to the core holder;
the inner diameter of the liquid inlet pipeline is 10-13 mm, so that the pipeline can be effectively prevented from being blocked by the temporary plugging agent; specifically, it may be 10 mm.
In the above-mentioned combination design method for the solid temporary plugging material, the liquid outlet of the liquid discharge pipeline is connected with a beaker, and the beaker is placed on an electronic balance;
the confining pressure pump is connected with a liquid storage tank;
the intermediate container is an acid-resistant container; the liquid inlet pipeline and the liquid discharge pipeline are both acid-resistant pipelines.
Specifically, the combined design method of the solid temporary plugging material with the undersize holes comprises the following steps:
(1) selecting a rock core, filling the acid liquor into an intermediate container, and applying confining pressure to the rock core; performing an acid liquor displacement experiment, forming an acid wormhole which is communicated from an inlet to an outlet on the rock core, and stopping injecting the acid liquor;
(2) taking out the acid-etched rock core, and observing the size and the shape of the acid-etched earthworm hole;
(3) selecting a solid temporary plugging agent according to the size of the wormhole subjected to acid etching, preparing temporary plugging liquid, and pouring the temporary plugging liquid into an intermediate container;
(4) loading the acid-etched rock core into a rock core holder, applying confining pressure to the rock core, and performing temporary plugging fluid displacement; the injection pressure was collected.
In the above solid temporary plugging material combination design method, in the step (1), the confining pressure is 2-10 MPa, specifically 5 MPa; the displacement capacity of the acid liquid displacement is 1-10 ml/min, and specifically can be 5 ml/min; the displacement time of the acid liquid displacement is 10-30 min, and specifically can be 20 min;
in the step (4), the confining pressure is 2-10 MPa, and specifically can be 5 MPa; the displacement volume of the temporary plugging fluid displacement is 5-30 ml/min, and specifically can be 20 ml/min;
and (4) in the displacement process of the step (4), timely adjusting the confining pressure according to the injection pressure, and ensuring that the confining pressure is always more than 2MPa higher than the displacement pressure.
In the above method for designing a combination of a solid temporary plugging material, the method further comprises the step of evaluating the performance of the temporary plugging agent, preferably selecting the size and combination of the temporary plugging agent, according to the change rule of temporary plugging pressure.
In the above solid temporary plugging material combination design method, the core is a carbonate rock core;
the acid liquid comprises water, a corrosion inhibitor and an acid liquid thickener;
specifically, in the acid liquor, the mass fraction of the corrosion inhibitor is 1-2%; the mass fraction of the acid liquid thickener is 0.5-1%;
the corrosion inhibitor is a hydrochloric acid corrosion inhibitor.
In the above method of designing a combination of solid temporary plugging materials, the carrier fluid is a guanidine gum fracturing fluid.
Specifically, the temporary plugging liquid comprises a temporary plugging agent, water, guanidine gum and a cross-linking agent;
more specifically, in the temporary plugging liquid, the mass fraction of the temporary plugging agent is 1-6%;
the mass fraction of the guanidine gum is 0.2-1%;
the mass fraction of the cross-linking agent is 0.4-0.8%;
the temporary plugging liquid is prepared by a method comprising the following steps: and adding guanidine gum into water, then regulating the pH value of the water to 9-11 by using a NaOH solution, finally adding a temporary plugging agent and a crosslinking agent, and uniformly mixing to obtain the temporary plugging liquid.
The invention has the following advantages:
1. acid liquor displacement is carried out on the carbonate rock core to form an acid-etched earthworm hole penetrating through the rock core, a small-size eyelet is simulated, and the rock core with the earthworm hole can be repeatedly used.
2. The displacement pipeline of the temporary plugging agent is enlarged to 10mm, the temporary plugging agent is prevented from plugging the pipeline, and the carrier fluid carries the temporary plugging agent to enter the earthworm hole and is close to the actual stratum condition.
3. The rock core with the earthworm holes formed is adopted for displacement of the temporary plugging agent, and the matching relation between the size of the temporary plugging agent and the size of the earthworm holes can be simulated.
4. The solid temporary plugging material combination design of small-size holes is designed through the temporary plugging effect.
Drawings
Fig. 1 is a photograph of the core after acid etching of example 2.
FIG. 2 is a schematic structural diagram of an experimental device for evaluating temporary plugging performance of a temporary plugging agent;
the figures are labeled as follows:
1. 11 a liquid storage tank; 2, a liquid injection pump; 3 an intermediate container; 4, a data acquisition system; 5 liquid inlet pipeline; 6, a rock core holder; 7 a liquid discharge line; 8, a beaker; 9 an electronic balance; 10 enclosing and pressing the pump.
FIG. 3 is a graph showing the temporal change of the temporary plugging differential pressure during the experiment of example 2.
FIG. 4 is a graph of temporary plugging differential pressure over time during the experiment of example 3.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The experimental procedures in the following examples are conventional unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The hydrochloric acid corrosion inhibitors of the following examples were purchased from Beijing, Maishi oil field chemical technologies, Inc.; the acid thickener is purchased from Beijing Xitao technology development Co., Ltd; temporary plugging agents were purchased from kenou (suzhou) applied chemistry ltd; the guanidine gum is purchased from Kyoho Kyokun oil field science and technology company of Jiangsu Kunshan; the cross-linking agent was purchased from Kyokun oil field science and technology, Jiangsu Kunshan.
As shown in fig. 2, the experimental device for evaluating the temporary plugging performance of the temporary plugging agent comprises an intermediate container 3, a core holder 6 and a confining pressure pump 10, wherein the intermediate container 3 is connected with the core holder 6 through a liquid inlet pipeline 5, and the confining pressure pump 10 is connected to the core holder 6; the intermediate container 3 is sequentially connected with the liquid injection pump 2 and the liquid storage tank 1 through pipelines; a liquid outlet of the core holder 6 is connected with a liquid drainage pipeline 7, a liquid outlet of the liquid drainage pipeline 7 is connected with a beaker 8, and the beaker 8 is placed on an electronic balance 9; the core holder 6 is connected with a data acquisition system 4; the confining pressure pump 10 is connected with a liquid storage tank 11; the inner diameter of the liquid inlet pipeline 5 is 10 mm.
Further, the intermediate container 3 is an acid-resistant container, and the liquid inlet pipeline 5 and the liquid discharge pipeline 7 are acid-resistant pipelines.
Example 2
A combined design method of a solid temporary plugging material with undersize holes comprises the following steps:
(1) selecting a carbonate rock core, and installing the carbonate rock core in a core holder of the temporary plugging agent temporary plugging performance evaluation experimental device in the embodiment 1; preparing a displacement acid solution, pouring 500ml of water into a beaker, adding a hydrochloric acid corrosion inhibitor to enable the mass fraction of the hydrochloric acid corrosion inhibitor in the displacement acid solution to be 1%, continuously stirring, adding an acid solution densifier to enable the mass fraction of the hydrochloric acid corrosion inhibitor in the displacement acid solution to be 0.5%, stirring for 10 minutes, then filling the prepared displacement acid solution into an intermediate container, and applying 5MPa confining pressure to the rock core.
(2) And setting displacement volume to be 5ml/min, carrying out an acid liquor displacement experiment, forming an acid wormhole which is communicated from an inlet to an outlet on the rock core, and stopping acid injection after displacing for 20 min.
(3) And taking out the acid-etched carbonate rock core, and observing the size and the form of the acid-etched earthworm hole, wherein the size of the earthworm hole is 4-5 mm.
(4) Selecting a solid temporary plugging agent according to the size of the wormholes; the temporary plugging agent is a combination of a 2mm particle temporary plugging agent and a 20/60-mesh powder temporary plugging agent, and the mass ratio of the temporary plugging agent to the powder temporary plugging agent is 1: 1.
(5) Preparing temporary plugging liquid, pouring 1000ml of water into a stirring cup, continuously stirring, gradually adding guar gum, adjusting the pH value to 9-11 by using a NaOH solution, stirring for 10 minutes, adding the temporary plugging agent obtained in the step (4), stirring for 2 minutes, uniformly mixing, adding a cross-linking agent to form temporary plugging liquid, and pouring the prepared temporary plugging liquid into an intermediate container; wherein, the mass fractions of the guanidine gum, the temporary plugging agent and the cross-linking agent in the temporary plugging liquid are respectively 0.3 percent, 4 percent and 0.4 percent.
(6) And (4) loading the acid-etched carbonate rock core into a rock core holder, and applying 5MPa confining pressure to the rock core.
(7) And (3) opening an injection system, setting the discharge capacity to be 20ml/min, performing temporary plugging fluid displacement, adjusting the confining pressure timely according to the injection pressure (ensuring that the confining pressure is always more than 2MPa higher than the displacement pressure) in the experimental process, and collecting the injection pressure.
(8) And observing an injection pressure change curve, and stopping the experiment within 2200 seconds because the temporary plugging pressure is not high all the time, which shows that the temporary plugging effect is not good. As a result, as shown in fig. 3, it can be seen from fig. 3 that the particles did not cause plugging in the wormholes.
(9) And (4) taking out the rock core after the experiment, and observing the temporary plugging condition of the temporary plugging agent in the earthworm hole. And (4) evaluating the performance of the temporary plugging agent according to the change rule of the temporary plugging pressure, and optimizing the size and the combination.
Example 3
On the basis of example 2, the core with earthworm holes of example 2 is used for carrying out experiments, the size and the addition of the temporary plugging agent are changed, the temporary plugging agent adopts 4mm particle temporary plugging agent +20/60 mesh powder temporary plugging agent, the mass ratio is 1:2, the mass fraction is 6%, the subsequent operation steps are the same as example 2, and the difference is that the temporary plugging agent in example 2 is replaced.
The experimental result is shown in fig. 4, and it can be seen from fig. 4 that the temporary plugging pressure rises to 10MPa, which indicates that the temporary plugging effect of the temporary plugging agent is better, and the experiment is stopped.
Claims (10)
1. A combined design method of a solid temporary plugging material with undersize holes comprises the following steps:
performing acid liquor displacement on the rock core by adopting a temporary plugging agent temporary plugging performance evaluation experimental device, forming acid-etched earthworm holes on the rock core, performing temporary plugging agent displacement on the acid-etched rock core, and performing solid temporary plugging material combination design of small-size holes according to the displacement pressure change rule;
the temporary plugging agent is displaced by temporary plugging fluid prepared from carrier fluid and temporary plugging agent.
2. The solid temporary plugging material combination design method according to claim 1, characterized in that: the experimental device for evaluating the temporary plugging performance of the temporary plugging agent comprises an intermediate container, a rock core holder and a confining pressure pump;
the middle container is connected with the rock core holder through a liquid inlet pipeline;
the confining pressure pump is connected to the core holder; the intermediate container is sequentially connected with the liquid injection pump and the liquid storage tank through pipelines; a liquid outlet of the core holder is connected with a liquid drainage pipeline, and a data acquisition system is connected to the core holder;
the inner diameter of the liquid inlet pipeline is 10-13 mm.
3. The solid temporary plugging material combination design method according to claim 2, characterized in that: a liquid outlet of the liquid drainage pipeline is connected with a beaker, and the beaker is placed on an electronic balance;
the confining pressure pump is connected with a liquid storage tank;
the intermediate container is an acid-resistant container, and the liquid inlet pipeline and the liquid discharge pipeline are both acid-resistant pipelines.
4. A method of designing a combination of solid plugging materials according to any one of claims 1 to 3, wherein: the method comprises the following steps:
(1) selecting a rock core, filling the acid liquor into an intermediate container, and applying confining pressure to the rock core; performing an acid liquor displacement experiment, forming an acid wormhole which is communicated from an inlet to an outlet on the rock core, and stopping injecting the acid liquor;
(2) taking out the acid-etched rock core, and observing the size and the shape of the acid-etched earthworm hole;
(3) selecting a solid temporary plugging agent according to the size of the wormhole subjected to acid etching, preparing temporary plugging liquid, and pouring the temporary plugging liquid into an intermediate container;
(4) loading the acid-etched rock core into a rock core holder, applying confining pressure to the rock core, and performing temporary plugging fluid displacement; the injection pressure was collected.
5. The solid temporary plugging material combination design method according to claim 4, wherein: in the step (1), the confining pressure is 2-10 MPa, the displacement volume of the acid liquor displacement is 1-10 ml/min, and the displacement time of the acid liquor displacement is 10-30 min;
in the step (4), the confining pressure is 2-10 MPa, and the displacement volume of the temporary plugging liquid displacement is 5-30 ml/min;
and (4) in the displacement process of the step (4), timely adjusting the confining pressure according to the injection pressure, and ensuring that the confining pressure is always more than 2MPa higher than the displacement pressure.
6. The solid temporary plugging material combination design method according to claim 4 or 5, wherein: the method also comprises the step of evaluating the performance of the temporary plugging agent, preferably selecting the size and the combination of the temporary plugging agent according to the change rule of the temporary plugging pressure.
7. A method of designing a combination of solid plugging materials according to any one of claims 1 to 6, wherein: the rock core is a carbonate rock core;
the acid liquid comprises water, a corrosion inhibitor and an acid liquid thickener;
in the acid liquor, the mass fraction of the corrosion inhibitor is 1-2%; the mass fraction of the acid liquid thickener is 0.5-1%.
8. A method of designing a combination of solid plugging materials according to any one of claims 1 to 7, wherein: the carrying fluid is guanidine gum fracturing fluid.
9. A method of designing a combination of solid plugging materials according to any one of claims 1 to 8, wherein: the temporary plugging liquid comprises a temporary plugging agent, water, guanidine gum and a cross-linking agent;
in the temporary plugging liquid, the mass fraction of the temporary plugging agent is 1-6%; the mass fraction of the guanidine gum is 0.2-1%; the mass fraction of the cross-linking agent is 0.4-0.8%.
10. The solid temporary plugging material combination design method according to claim 9, wherein: the temporary plugging liquid is prepared by a method comprising the following steps: and adding guanidine gum into water, then regulating the pH value of the water to 9-11 by using a NaOH solution, finally adding a temporary plugging agent and a crosslinking agent, and uniformly mixing to obtain the temporary plugging liquid.
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| CN202010855451.9A CN111999143A (en) | 2020-08-24 | 2020-08-24 | Combined design method of solid temporary plugging material with undersize holes |
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| CN202010855451.9A CN111999143A (en) | 2020-08-24 | 2020-08-24 | Combined design method of solid temporary plugging material with undersize holes |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158122A (en) * | 2015-08-13 | 2015-12-16 | 中国石油大学(北京) | Device and method for testing temporary blocking performance of temporary blocking and diverting agent for acid fracturing |
| CN110210144A (en) * | 2019-06-05 | 2019-09-06 | 西南石油大学 | A kind of diverting agent promotes the optimum design method of fractured horizontal well crack uniform expansion |
| CN110967287A (en) * | 2019-11-26 | 2020-04-07 | 西南石油大学 | Optimization experiment method for combination ratio of composite temporary plugging steering material |
| CN210863689U (en) * | 2019-10-31 | 2020-06-26 | 北京九恒质信能源技术有限公司 | Fracturing temporary plugging diverting agent temporary plugging performance testing device |
-
2020
- 2020-08-24 CN CN202010855451.9A patent/CN111999143A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158122A (en) * | 2015-08-13 | 2015-12-16 | 中国石油大学(北京) | Device and method for testing temporary blocking performance of temporary blocking and diverting agent for acid fracturing |
| CN110210144A (en) * | 2019-06-05 | 2019-09-06 | 西南石油大学 | A kind of diverting agent promotes the optimum design method of fractured horizontal well crack uniform expansion |
| CN210863689U (en) * | 2019-10-31 | 2020-06-26 | 北京九恒质信能源技术有限公司 | Fracturing temporary plugging diverting agent temporary plugging performance testing device |
| CN110967287A (en) * | 2019-11-26 | 2020-04-07 | 西南石油大学 | Optimization experiment method for combination ratio of composite temporary plugging steering material |
Non-Patent Citations (2)
| Title |
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| LUFENG ZHANG 等: "Experimental study on plugging behavior of degradable fibers and particulates within acid-etched fracture", 《JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING》 * |
| 牟建业 等: "缝洞型储层酸压暂堵剂封堵性能研究", 《中国科技论文》 * |
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