阅读说明：本技术 耐高温调堵组合物、耐高温调堵剂 (High-temperature-resistant plugging adjusting composition and high-temperature-resistant plugging adjusting agent ) 是由 包术成 王若浩 魏振国 方舒 崔晓鹏 王胜任 贾喻博 蒲星耀 孙璐 杨维丽 黄雪 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种耐高温调堵组合物、耐高温调堵剂,属于石油开采技术领域。本发明提供了一种耐高温调堵组合物,由以下重量百分含量的组分组成：植物纤维颗粒30％～50％、G级油井水泥40％～60％和钠膨润土10％～20％。植物纤维颗粒密度小,悬浮性能好,具有吸水膨胀和填充孔隙的作用,G级油井水泥有利于提高孔隙喉道封堵强度,钠膨润土具有吸水膨胀性,良好的增稠和悬浮性能,能够起填充孔隙和悬浮作用,特定用量的植物纤维颗粒、G级油井水泥和钠膨润土混合后具有吸水膨胀倍数大,良好的悬浮性能和封堵性能,耐高温调堵组合物与水混合后能较好地填充亏空地层、封堵高渗层,提高稠油中后期开发效果。(The invention relates to a high-temperature-resistant plugging adjusting composition and a high-temperature-resistant plugging adjusting agent, and belongs to the technical field of oil exploitation. The invention provides a high-temperature-resistant blockage-regulating composition which comprises the following components in percentage by weight: 30-50% of plant fiber particles, 40-60% of G-grade oil well cement and 10-20% of sodium bentonite. The plant fiber particle density is small, the suspension performance is good, the effects of water absorption expansion and pore filling are achieved, G-grade oil well cement is beneficial to improving the pore throat blocking strength, sodium bentonite has water absorption expansion performance, good thickening and suspension performance can play a role in pore filling and suspension, the plant fiber particles with specific dosage, the G-grade oil well cement and the sodium bentonite have large water absorption expansion times after being mixed, good suspension performance and blocking performance are achieved, the high-temperature-resistant blocking adjusting composition can be well filled in a voided stratum and used for blocking a high-permeability layer after being mixed with water, and the middle and later development effects of oil are improved.)

1. The high-temperature-resistant blockage adjusting composition is characterized by comprising the following components in percentage by weight:

30-50% of plant fiber particles, 40-60% of G-grade oil well cement and 10-20% of sodium bentonite.

2. The high-temperature-resistant blockage-adjusting composition as claimed in claim 1, wherein the high-temperature-resistant blockage-adjusting composition comprises the following components in percentage by weight:

40% of plant fiber particles, 40% of G-grade oil well cement and 20% of sodium bentonite.

3. The high-temperature-resistant profile control agent is characterized by comprising water and the following components in percentage by weight:

30-50% of plant fiber particles, 40-60% of G-grade oil well cement and 10-20% of sodium bentonite.

4. The high-temperature-resistant profile control agent according to claim 3, wherein the high-temperature-resistant profile control agent consists of water and the following components in percentage by weight:

40% of plant fiber particles, 40% of G-grade oil well cement and 20% of sodium bentonite.

5. The high-temperature-resistant profile control agent according to claim 3 or 4, wherein the water is contained in the high-temperature-resistant profile control agent in an amount of 70-80% by mass.

6. The high-temperature resistant profile control agent according to claim 5, wherein the water is present in the high-temperature resistant profile control agent in an amount of 75% by mass.

7. The high temperature resistant profile control agent according to claim 3 or 4, wherein the particle size of the plant fiber particles is 300 mesh or more.

8. The high temperature resistant profile control agent according to claim 3 or 4, wherein the grain size of the G-grade oil well cement is 300 meshes or more.

9. The high-temperature resistant profile control agent according to claim 3 or 4, wherein the particle size of the sodium bentonite is 300 meshes or more.

10. The high temperature resistant profile control agent according to claim 3 or 4, wherein the G-class oil well cement is a G-class medium oil well cement.

Technical Field

The invention relates to a high-temperature-resistant plugging adjusting composition and a high-temperature-resistant plugging adjusting agent, and belongs to the technical field of oil exploitation.

Background

In the process of thick oil steam exploitation, after multiple times of steam stimulation, due to the influence of factors such as oil layer vacancy, steam channeling, side water and the like, the conventional steam stimulation recovery rate is low, and if the oil layer vacancy can cause steam overflow, a completely independent closed system can not be formed. It is generally accepted that conventional steam throughput recovery is only 20%. In order to further improve the development effect and improve the oil layer utilization degree, a high-temperature-resistant plugging agent needs to be injected before steam is injected to plug a pore throat, so that a steam channeling channel is plugged, the influence of side water is inhibited, and the overflow of steam is avoided, so that the aim of improving the steam swept volume is fulfilled. In recent years, the operation cost of field application measures of the high-temperature particle plugging agent is high, and the measure benefit is poor.

The space for reducing the operation cost of the profile control channeling sealing measures through the current profile control technology and process parameter optimization is not large. The method is used for counting 93 wells of severe oil wells in 10 steam channeling areas of Henan heavy oil field in 2015-supple 2017 years, and the average single-well deficit is 6936m³The average oil production of a single well is 0.5t, the production effect is poor, and no effective treatment means exists for the oil reservoir depletion at present.

Chinese patent (application publication No. CN105399907A) discloses an oil-containing sludge gel particle profile control agent and a preparation method thereof, wherein the mass concentrations of the components are respectively as follows: 5 to 10 percent of plant straw, 15 to 30 percent of oil-containing sludge slurry, 15 to 32 percent of polymerized monomer, 0.03 to 0.15 percent of initiator, 0.08 to 0.15 percent of cross-linking agent and the balance of water. The oil-containing sludge gel particle profile control agent is prepared by mixing plant straws, oil-containing sludge slurry, a polymerization monomer, an initiator, a cross-linking agent and water. The method comprises the steps of adding specially treated plant straws into oil-containing sludge slurry to prepare an oil-containing sludge profile control agent core wrapped with the plant straws, filling the core into chemically synthesized gel to form a plant straw reinforced gel particle profile control agent, and adjusting the density and the strength of the profile control agent by adjusting the adding proportion of the plant straws, so that the profile control agent can be ensured to have higher strength while the density of the particle profile control agent is reduced, the water absorption can reach 4.8-9.5 times, the expansion time is 5-28 days, the profile control agent has good expansion capacity and delayed expansion performance, and the deep placement and the effective plugging of an oil reservoir can be realized. However, the profile control agent is not high temperature resistant, cannot be applied to a heavy oil thermal recovery well, and is not suitable for heavy oil thermal recovery.

Disclosure of Invention

The first purpose of the invention is to provide a high-temperature-resistant plugging adjusting composition which is high-temperature-resistant, and the plugging effect of the high-temperature-resistant plugging adjusting agent obtained after the composition is mixed with water is good.

The second purpose of the invention is to provide a high-temperature resistant plugging agent which can resist the high temperature of 350 ℃ and has good plugging effect.

The technical scheme of the invention is as follows:

the high-temperature-resistant blockage-adjusting composition comprises the following components in percentage by weight: 30-50% of plant fiber particles, 40-60% of G-grade oil well cement and 10-20% of sodium bentonite.

The high-temperature-resistant plugging adjusting composition has the advantages of simple components, remarkable synergistic effect among the components, small plant fiber particle density, good suspension performance and the functions of water absorption expansion and pore filling, the G-grade oil well cement is favorable for improving the plugging strength of pore throats, the sodium bentonite has the functions of water absorption expansion and good thickening and suspension performance and can play the roles of pore filling and suspension, the plant fiber particle 30-50 wt%, the G-grade oil well cement 40-60 wt% and the sodium bentonite 10-20 wt% are mixed to have the functions of large water absorption expansion multiple, good suspension performance and plugging performance, and the high-temperature-resistant plugging adjusting composition can better fill in a voided stratum and plug a high-permeability layer after being mixed with water, so that the middle and later development effects of thick oil are improved.

In order to further improve the synergistic effect of the plant fiber particles, the G-grade oil well cement and the sodium bentonite and further improve the water swelling property, the suspension property and the blocking property, preferably, the high-temperature resistant blocking-regulating composition consists of the following components in percentage by weight: 40% of plant fiber particles, 40% of G-grade oil well cement and 20% of sodium bentonite.

The high-temperature-resistant profile control and plugging agent consists of water and the following components in percentage by weight: 30-50% of plant fiber particles, 40-60% of G-grade oil well cement and 10-20% of sodium bentonite.

The high-temperature-resistant plugging agent can effectively fill the stratum deficit, plug a steam channeling channel, inhibit the influence of side water, adjust the steam absorption profile of an oil layer, improve the swept volume of subsequently injected steam, improve the oil production and oil-steam ratio of an oil well, reduce the operation cost of measures, and improve the effect and benefit of plugging and adjusting measures. The method aims to improve the development effect of the thickened oil field and effectively relieve the problem of poor benefit of the thickened oil production effect caused by factors such as stratum depletion in the middle and later periods of thickened oil exploitation.

The high-temperature-resistant plugging agent can resist the high temperature of 350 ℃, and is suitable for heavy oil thermal recovery huff and puff. The method is matched with steam huff and puff, and can be applied to a thick oil thermal recovery well to block and regulate a depletion well layer, improve the flat section contradiction, enlarge the steam swept volume, improve the oil production and oil-steam ratio of an oil well, reduce the measure operation cost and improve the effect and benefit of blocking and regulating measures. The water absorption expansion multiple reaches 1.8 times, and the water absorption expansion multiple can well fill the voided stratum and meet the deep profile control requirement of the middle and later periods of oil well exploitation. The plugging rate is more than 95 percent, and the requirements of profile control and water suppression of a high permeable stratum of an oil well can be met. The water separation rate is less than 10%, the particle plugging agent has good suspension performance, and can meet the requirement of high-cycle deep profile control. Low use concentration, economy, practicality and low price. And does not contain organic chlorine, and has no harm to the production and use of products.

The plant fiber particles are prepared from stalks of crop straws such as rice hulls, rice straws, wheat straws, corn straws, cotton straws and the like. The plant fiber particles can be prepared from one crop straw or can be mixed plant fiber particles prepared from various crop straws.

In order to further improve the synergistic effect of the plant fiber particles, the G-grade oil well cement and the sodium bentonite and further improve the water absorption expansibility, the suspensibility and the plugging property of the high-temperature resistant plugging modifier, preferably, the high-temperature resistant plugging modifier consists of water and the following components in percentage by weight: 40% of plant fiber particles, 40% of G-grade oil well cement and 20% of sodium bentonite.

In order to ensure that the high-temperature resistant plugging agent has good plugging effect and pumpability, the water is preferably contained in the high-temperature resistant plugging agent in a mass percentage of 70-80%.

It can be understood that the plant fiber particles, the G-grade oil well cement and the sodium bentonite can be uniformly mixed with water to obtain the high-temperature-resistant plugging modifier with the water mass percentage of 70-80%, and the high-temperature-resistant plugging modifier is directly pumped into the stratum, or the plant fiber particles, the G-grade oil well cement and the sodium bentonite can be uniformly mixed to obtain the high-temperature-resistant plugging modifier composition, and water is added to ensure that the water mass percentage is 70-80% when the high-temperature-resistant plugging modifier is used, and then the high-temperature-resistant plugging modifier composition is pumped into the stratum.

In order to further improve the blocking effect and pumpability of the high-temperature resistant plugging agent, the mass percentage of the water in the high-temperature resistant plugging agent is preferably 75%.

In order to further improve the suspension property, water absorption expansion and pore filling effect of the high temperature resistant plugging agent, the particle size of the plant fiber particles is preferably 300 meshes or more.

In order to further improve the pore throat plugging strength of the high-temperature resistant plugging agent, the grain size of the G-grade oil well cement is preferably more than 300 meshes.

In order to further improve the filling porosity and suspension performance of the high-temperature resistant plugging agent, the particle size of the sodium bentonite is preferably 300 meshes or more.

The type of the G-grade oil well cement can be selected from G-grade anti-oil well cement or G-grade anti-oil well cement according to the type of the oil field. Preferably, the class G oil well cement is a class G medium-resistant oil well cement.

The preparation method of the high-temperature-resistant profile control and plugging agent comprises the following steps: and mixing the plant fiber particles, the G-grade oil well cement, the sodium bentonite and water uniformly to obtain the cement.

The preparation method is simple and easy to operate, can be uniformly stirred at normal temperature, and is suitable for industrial production and field application.

Detailed Description

The present invention will be further described with reference to the following embodiments.

The particle size of the plant fiber particles in the embodiment of the invention is 300 meshes or more. The specific components are rice hull, rice straw, wheat straw and corn straw. The manufacturer: kao City Runji Petroleum technology Co.

In the embodiment of the invention, the grain size of the G-grade anti-oil well cement is more than 300 meshes.

The particle size of the sodium bentonite in the embodiment of the invention is more than 300 meshes. The manufacturer is Jixing chemical company of Limited liability in Jianqiu county, Henan province.

The specific embodiment of the high-temperature resistant profile control agent of the invention is as follows: