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Sand-carrying liquid for sand control in loose sandstone heavy oil reservoir

A technology for heavy oil reservoirs and sand-carrying fluids, applied in wellbore/well components, production fluids, chemical instruments and methods, etc. Unable to achieve high sand ratio filling and other problems, to achieve the effect of improving reservoir development effect, improving development effect, and solving water-sensitive problems

Active Publication Date: 2021-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hydroxypropyl guar gum sand-carrying fluid is mainly used, but the sand-carrying fluid has disadvantages such as shear degradation, low flowback rate, water-sensitive damage, high residual damage to the reservoir, and oil well production decline after sand control.
In addition, there is still a lack of pertinence to heavy oil reservoirs, and the following disadvantages exist: 1) The viscosity of heavy oil is high, and sand bridges are easily formed when guar gum sand-carrying liquid is used for formation extrusion filling, resulting in incompact filling; 2) A large amount of sand-carrying liquid squeezes into the formation, resulting in a decrease in the efficiency of subsequent steam injection; 3) The rheological properties of the sand-carrying liquid change at high temperatures, and the sand-carrying capacity decreases, making it impossible to achieve high sand ratio filling

Method used

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  • Sand-carrying liquid for sand control in loose sandstone heavy oil reservoir
  • Sand-carrying liquid for sand control in loose sandstone heavy oil reservoir
  • Sand-carrying liquid for sand control in loose sandstone heavy oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Preparation of sand-carrying fluid for sand control in unconsolidated sandstone heavy oil reservoirs

[0026] The components are as follows: 0.5% of the main agent of the sand-carrying liquid, 1.5% of the cleaning agent, 4% of the clay stabilizer, 1.0% of the water damage treatment agent, and the balance is water.

[0027] The main agent of the sand-carrying liquid is acrylamide-polyether acrylate-sodium n-butene sulfonate copolymer (obtained by acrylamide, polyether acrylate, and sodium n-butene sulfonate by conventional methods), wherein, a is an integer between 1000 and 1200, b and c are both integers between 800 and 1000, and m is an integer between 400 and 600.

[0028] The cleaning agent is sodium cetylbenzenesulfonate.

[0029] The clay stabilizer is a compound of an inorganic stabilizer and a quaternized polyether amine, and the inorganic stabilizer is NH 4 Cl; the quaternized polyetheramine is SLFP-G1 purchased from Shengli Oilfield Shengli Chemical...

Embodiment 2

[0032] Example 2 Preparation of sand-carrying fluid for sand control in unconsolidated sandstone heavy oil reservoirs

[0033] The components are as follows: 0.45% of the main agent of the sand-carrying liquid, 2% of the cleaning agent, 3% of the clay stabilizer, 1.5% of the water damage treatment agent, and the balance is water.

[0034] The main agent of the sand-carrying liquid is acrylamide-polyether acrylate-sodium n-butene sulfonate copolymer (obtained by acrylamide, polyether acrylate, and sodium n-butene sulfonate by conventional methods), wherein, a is an integer between 1200 and 1500, b and c are both integers between 1000 and 1200, and m is an integer between 600 and 800.

[0035] The cleaning agent is sodium dodecylbenzenesulfonate.

[0036] The clay stabilizer is a compound of an inorganic stabilizer and a quaternized polyether amine, and the inorganic stabilizer is selected from NH 4 Cl, KCl; the weight ratio of the inorganic stabilizer and polyetheramine is 2:...

Embodiment 3

[0039] Example 3 Preparation of sand-carrying fluid for sand control in unconsolidated sandstone heavy oil reservoirs

[0040] The components are as follows: 0.6% of the main agent of the sand-carrying liquid, 1% of the cleaning agent, 5% of the clay stabilizer, 0.5% of the water damage treatment agent, and the balance is water.

[0041] The main agent of the sand-carrying liquid is acrylamide-polyether acrylate-sodium n-butene sulfonate copolymer (obtained by acrylamide, polyether acrylate, and sodium n-butene sulfonate by conventional methods), wherein, a is an integer between 1000 and 1200, b and c are both integers between 800 and 1000, and m is an integer between 400 and 600.

[0042] The cleaning agent is sodium cetylbenzenesulfonate.

[0043] The clay stabilizer is a composite of an inorganic stabilizer and a quaternized polyetheramine, and the inorganic stabilizer is KCl; the weight ratio of the inorganic stabilizer to the polyetheramine is 3:1.

[0044] The water da...

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Abstract

The invention discloses a sand-carrying liquid used for sand prevention of an unconsolidated sandstone heavy oil reservoir. The sand-carrying liquid has the advantages of viscosity reduction, oil increase, low damage, water sensitivity resistance, inhibition of clay expansion, strong sand-carrying capacity and the like; and the sand-carrying liquid is composed of the following components in percentages by weight: 0.45%-0.6% of a main agent of the sand-carrying liquid, 1%-2% of a cleaning agent, 3%-5% of a clay stabilizer, 0.5%-1.5% of a water damage treatment agent and the balance of water. According to the sand-carrying liquid provided by the invention, after the main agent of the sand-carrying liquid is dissolved into the water, branch chains are stretched to form a space network structure, so that the sand carrying capacity is improved; polar groups in the sand-carrying liquid can rapidly infiltrate into heavy oil, through action of solubilizing, dispersing, destruction of a heavy oil structure, change of a component content and the like, the viscosity of the heavy oil is reduced, the fluidity is improved, and the development effect of the oil reservoir is improved; and when thesand-carrying liquid provided by the invention is used, a success rate of sand preventing construction and a validity period of sand prevention can be improved, the viscosity of the heavy oil can bereduced, and a development effect of heavy oil steam injection is improved.

Description

technical field [0001] The invention relates to a sand-carrying liquid for sand control in unconsolidated sandstone heavy oil reservoirs, belonging to the technical field of sand control in unconsolidated sandstone heavy oil reservoirs. Background technique [0002] Unconsolidated sandstone heavy oil reservoirs have loose reservoir structure, poor cementation performance, and high shale content in the reservoir, resulting in serious sand production. At the same time, the thermal recovery of heavy oil leads to a deficit outside the formation filling zone, and sand particles migrate repeatedly. Sand control needs to be carried out before and during the production of new wells. Sand control technology has become the basic technology for the development of unconsolidated sandstone heavy oil reservoirs, and plays a key role in the sustained and stable production of oilfields. At present, composite sand control, extrusion filling sand control and other technologies are mainly use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/528C09K8/584C09K8/03E21B43/04
CPCC09K8/03C09K8/528C09K8/584C09K2208/12E21B43/04
Inventor 张松亭王志坚杨胜利白昕荣雁杜春安陈晓春马天态孙立柱岳继文杨再新
Owner CHINA PETROLEUM & CHEM CORP
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