阅读说明：本技术 一种固体颗粒长效物理堵水调剖剂及其使用工艺 (Solid particle long-acting physical water shutoff profile control agent and use process thereof ) 是由 贾珍 杜浩 白鹏 牛建宏 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种固体颗粒长效物理堵水调剖剂,由不同粒径的固体颗粒组成,通过大颗粒与小颗粒混合使用,以物理堆积方式封堵注水井吸水层大孔道。本发明还公开了上述堵水调剖剂的使用方法。本发明固体颗粒长效物理堵水调剖剂,相比于传统的化学封堵剂,采用固体不规则颗粒,以物理堆积方式封堵注水井吸水大孔道,且该堵水调剖剂具有耐高压、耐高温、耐酸碱腐蚀破碎率低,不易分解,封堵吸水大孔道有效期长的特点。(The invention discloses a long-acting physical water plugging profile control agent of solid particles, which consists of solid particles with different particle sizes, and large particles and small particles are mixed for use to plug a large pore passage of a water absorption layer of a water injection well in a physical accumulation mode. The invention also discloses a use method of the water shutoff profile control agent. Compared with the traditional chemical plugging agent, the solid particle long-acting physical water plugging profile control agent adopts solid irregular particles and plugs the water absorption large pore passage of the water injection well in a physical accumulation mode, and has the characteristics of high pressure resistance, high temperature resistance, low breakage rate of acid-base corrosion resistance, difficult decomposition and long effective period for plugging the water absorption large pore passage.)

1. A long-acting physical water shutoff profile control agent of solid particles is characterized by consisting of solid particles with different particle sizes, and large particles and small particles are mixed for use to block large pores of a water absorption layer of a water injection well in a physical accumulation mode.

2. The long-acting physical water shutoff profile control agent of claim 1, wherein the solid particles are one or more of circular, elliptical and polygonal.

3. The long-acting physical water shutoff profile control agent as claimed in claim 1, wherein the solid particulate material is one or more of synthetic material particles or composite material particles.

4. The long-acting physical water shutoff profile control agent as claimed in claim 1, wherein the particle size of the solid particles is 200-3000 μm, and the bulk density of the solid particles is 0.4-2.0g/cm ².

5. The long-acting physical water shutoff profile control agent of claim 1, wherein the solid particle breakage rate requirement is as follows: the crushing rate is less than or equal to 98 percent in the environment with the temperature less than or equal to 120 ℃ and the pressure less than or equal to 90 Mpa.

6. The use process of the solid particle long-acting physical water shutoff profile control agent according to claim 1, wherein the solid particle does not decompose and has an effective period: the year is more than or equal to 3.

7. The use process of the solid particle long-acting physical water shutoff profile control agent according to any one of claims 1 to 6, which is implemented by the following steps:

Step 1, selecting large particles and small particles with different particle sizes according to the aperture of an oil layer of an implemented water injection well, and mixing the large particles and the small particles to form an irregular solid particle water plugging profile control agent with multiple particle sizes;

And 2, squeezing the carrier fluid of the water plugging profile control agent into the oil layer from the wellhead of the water injection well by adopting a high-pressure pump, pushing the water plugging profile control agent into the deep part of the oil layer along with displacement fluid after the water plugging profile control agent smoothly enters a pore passage of the oil layer, stacking and plugging large particles at the position of a pore throat necking in the pore passage, and plugging gaps among the large particles by small particles, thereby realizing the water plugging effect.

8. The use process of claim 7, wherein in step 1, the particle size of the large particles is selected within the range of 80% ± 5% of the effective pore size of the oil layer, and the particle size of the small particles is selected within the range of 200-.

9. The use process of the solid particle long-acting physical water shutoff profile control agent according to claim 7, wherein the volume ratio of the large particles to the small particles in step 1 is 3-8: 1.

10. The use process of the solid particle long-acting physical water shutoff profile control agent according to claim 7, wherein in the step 2, when the volume density of the water shutoff profile control agent is less than 1.0g/cm ³, the carrier fluid is clear water, and when the volume density of the water shutoff profile control agent is greater than 1.0g/cm ³, the carrier fluid is suspension.

Technical Field

the invention relates to the technical field of oilfield exploitation, relates to a solid particle long-acting physical water shutoff profile control agent, and also relates to a use process of the solid particle long-acting physical water shutoff profile control agent.

Background

Most oil fields in China begin to supplement stratum energy through water injection wells to improve the crude oil recovery rate, but due to the heterogeneity and complexity of the stratum, the phenomena of 'inrush' and 'cross flow' of injected water in oil reservoirs can occur in some wells.

one water injection well is communicated with about 2-8 oil wells, and most of injected water is directly discharged from part of the oil wells, so that the oil yield is reduced, water sources are wasted, and the oil-water separation treatment cost is increased.

In order to solve the conflict of water injection and sudden entry, the conventional measures include a mechanical water plugging method and a chemical water plugging method, and the principle is to plug a large pore passage, reduce the water absorption capacity of the large pore passage, increase the water absorption capacity of a medium-low permeable layer, adjust the water absorption profile between a water injection well and a communicated oil well, enlarge the water drive volume and improve the crude oil recovery ratio. The mechanical water plugging method is only suitable for oil reservoirs with clear oil-water interfaces and interlayers with certain thickness among small layers. The chemical water shutoff agent is not suitable for oil reservoirs without interlayer or oil field interlayer with too small thickness to implement separate-zone water injection or separate-zone liquid production unconditionally, is divided into water-based, oil-based and alcohol-based water shutoff agents, and mainly adopts underground crosslinking or ground crosslinking, and has the advantages that: can effectively block large pore paths in the stratum.

The method has the disadvantages that firstly, the concentration of the water plugging agent is uncontrollable due to the temperature and the pressure of the stratum, the difference of the time, the hardness and the volume of gelling is large, and large pore channel plugging or full large pore channel plugging is easy to cause, secondly, the effective period of plugging is short, the effective period of the chemical water plugging agent is very short due to factors such as long-term scouring of injected water, high-pressure propelling action, high-temperature easy dissolution of stratum water and the like, the general effective period is about 1-6 months, thirdly, the construction period is long, the construction steps are complex, the construction period needs 30-50 days, 1000m ³ -3000m ³ water is generally needed, a plurality of section plugs are respectively extruded, and the construction procedure needs to be operated by professional training.

In order to solve the technical problems in the background art, a brand new technology needs to be provided in addition to the mechanical water shutoff or chemical water shutoff profile control technology so as to meet the technical problems in the existing water shutoff profile control technology.

Disclosure of Invention

The invention aims to provide a solid particle long-acting physical water shutoff profile control agent, and provides a novel physical water shutoff profile control agent for oil field water shutoff.

The invention also aims to provide a using process of the solid particle long-acting physical water shutoff profile control agent.

The technical scheme adopted by the invention is as follows:

A long-acting physical water shutoff profile control agent of solid particles is composed of solid particles with different particle sizes, and large pores of a water absorption layer of a water injection well are plugged in a physical accumulation mode through mixing large particles and small particles.

The present invention is also characterized in that,

the solid particles are one or more of round, oval and polygonal.

The solid particle material is one or the combination of more of synthetic material particles or composite material particles.

The particle size of the solid particles is 200-3000 mu m, and the volume density of the solid particles is 0.4-2.0g/cm ².

the solid particle crushing rate requirement is as follows: the crushing rate is less than or equal to 98 percent in the environment with the temperature less than or equal to 120 ℃ and the pressure less than or equal to 90 Mpa.

Effective period of non-decomposition of solid particles: the year is more than or equal to 3.

The invention adopts another technical scheme that a use process of the solid particle long-acting physical water shutoff profile control agent is implemented according to the following steps:

Step 1, selecting large particles and small particles with different particle sizes according to the aperture of an oil layer of an implemented water injection well, and mixing the large particles and the small particles to form an irregular solid particle water plugging profile control agent with multiple particle sizes;

and 2, squeezing the carrier fluid of the water plugging profile control agent into the oil layer from the wellhead of the water injection well by adopting a high-pressure pump, pushing the water plugging profile control agent into the deep part of the oil layer along with displacement fluid after the water plugging profile control agent smoothly enters a pore passage of the oil layer, stacking and plugging large particles at the position of a pore throat necking in the pore passage, and plugging gaps among the large particles by small particles, thereby realizing the water plugging effect.

The present invention is also characterized in that,

In the step 1, the particle size of the large particles is selected within the range of 80% +/-5% of the effective pore diameter of the oil layer, and the particle size of the small particles is selected within the range of 200-.

In the step 1, the volume ratio of the large particles to the small particles is 3-8: 1.

In the step 2, when the volume density of the water plugging profile control agent is less than 1.0g/cm ³, the carrier fluid is clear water, and when the volume density of the water plugging profile control agent is more than 1.0g/cm ³, the carrier fluid is suspension.

The solid particle long-acting physical water shutoff profile control agent has the beneficial effects that compared with the traditional chemical shutoff agent, the solid irregular particles are adopted to block the water absorption large pore passage of the water injection well in a physical accumulation mode, and the water shutoff profile control agent has the characteristics of high pressure resistance, high temperature resistance, low breakage rate of acid-base corrosion resistance, difficulty in decomposition and long effective period for blocking the water absorption large pore passage.

Detailed Description

The invention is further illustrated by the following specific examples.

A long-acting physical water-plugging profile control agent of solid particles is composed of solid particles with different particle sizes, and large particles and small particles are mixed for use to plug the large pore channel of a water-absorbing layer of a water injection well in a physical accumulation mode.

the solid particles are one or more of round, oval and polygonal.

the solid particle material is one or the combination of more of synthetic material particles or composite material particles.

The particle size of the solid particles is 200-3000 mu m, and the volume density of the solid particles is 0.4-2.0g/cm ².

The solid particle crushing rate requirement is as follows: the crushing rate is less than or equal to 98 percent in the environment with the temperature less than or equal to 120 ℃ and the pressure less than or equal to 90 Mpa.

The effective period of the solid particles is more than or equal to 3 years without decomposition.

A use process of a solid particle long-acting physical water shutoff profile control agent is implemented according to the following steps:

Step 1, selecting large particles and small particles with different particle sizes according to the aperture of an oil layer of an implemented water injection well, and mixing the large particles and the small particles to form an irregular solid particle water plugging profile control agent with multiple particle sizes;

The particle size of the large particles is selected within the range of 80 +/-5 percent of the effective pore diameter of the oil layer, and the particle size of the small particles is selected within the range of 200-400 mu m. The volume ratio of the large particles to the small particles is 3-8: 1.

And 2, squeezing the carrier fluid of the water plugging profile control agent into the oil layer from the wellhead of the water injection well by using a high-pressure pump, wherein the water plugging profile control agent is pushed to the deep part of the oil layer along with displacement fluid after smoothly entering a pore passage of the oil layer, large particles of the water plugging profile control agent are piled and plugged at a throat necking part in the pore passage, and small particles of the water plugging profile control agent can plug gaps among the large particles, so that the water absorption profile is adjusted, the sweep coefficient of injected water is improved, residual oil and residual oil which are not swept by water flooding before profile control in the stratum are displaced, and the final crude oil recovery rate is improved.

When the volume density of the water plugging profile control agent is less than 1.0g/cm ³, the carrier fluid is clear water, and when the volume density of the water plugging profile control agent is more than 1.0g/cm ³, the carrier fluid is suspension.