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Sand-fixing and plugging-removing treatment fluid for oil well sand control in fine silt sand reservoirs, sand control treatment fluid system and sand control method using the same

A technology for treating liquid and fine silt, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as overhaul accidents, formation cold damage, and high operating costs, so as to avoid overhaul and salvage operations and meet production requirements. demand, effect of risk reduction measures

Active Publication Date: 2021-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Mechanical sand control methods cannot control fine silt, mud and clay substances with small particle sizes;
[0007] (2) Sand control screens are easily blocked by fine silt and mud, resulting in reduced production or output of oil wells;
[0008] (3) The sand control pipe string lowered into the well is easy to be buried by sand, and it is easy to cause overhaul accidents during salvage;
[0009] (4) The fracturing sand control or filling sand control process is complicated and the operation cost is high;
[0011] (6) The freezing point of crude oil in some shallow unconsolidated reservoirs is relatively high, and external treatment fluids are likely to cause cold damage to the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The sand control treatment fluid system of this embodiment is composed of a pretreatment fluid, a pre-fluid, a sand-fixing and plugging-removing treatment fluid, and a displacement fluid. For: 50:10:20:10.

[0047] The pretreatment liquid is composed of the following components in mass content: 2% AE-121 cleaning agent, 98% water.

[0048] The pre-fluid is composed of the following components in mass content: 12% hydrochloric acid, 0.5% XT-05 drainage aid, 1.5% IS-130 corrosion inhibitor, 2% SCA iron ion stabilizer, 2% TH- 11 Mutual solvent, 2%NH 4 Cl, 80% water, and described hydrochloric acid is the hydrochloric acid that technical grade mass fraction is 31%.

[0049] The sand-fixing and plugging-removing treatment liquid is composed of the following components by mass content: 10% XT-68 sand-fixing and plugging-removing agent, 0.5% XT-05 drainage aid, 2% IS-130 corrosion inhibitor, 2% SCA iron ion stabilizer, 2% TH-11 mutual solvent, 1% NH 4 Cl, and the balance i...

Embodiment 2

[0053] The sand control treatment fluid system of this embodiment is composed of a pretreatment fluid, a pre-fluid, a sand-fixing and plugging-removing treatment fluid, and a displacement fluid. For: 45:12:30:15.

[0054] The pretreatment solution is composed of the following components in mass content: 2% AE-121 cleaning agent and 98% water are stirred and mixed in the liquid mixing tank.

[0055] The pre-fluid is composed of the following components in mass content: 10% hydrochloric acid, 0.5% XT-05 drainage aid, 1.5% IS-130 corrosion inhibitor, 2% SCA iron ion stabilizer, 2% TH- 11 mutual solvent, 2% NH 4 Cl and the rest of the water are evenly stirred in the mixing tank.

[0056] The sand-fixing and plugging-removing treatment liquid is composed of the following components in mass content: 12% XT-68 sand-fixing and plugging-removing agent, 0.5% XT-05 drainage aid, 2% IS-130 corrosion inhibitor, 2% SCA iron ion stabilizer, 2% TH-11 mutual solvent, 1% NH 4 Cl and the res...

Embodiment 3

[0060] The sand control treatment fluid system of this embodiment is composed of a pretreatment fluid, a pre-fluid, a sand-fixing and plugging-removing treatment fluid, and a displacement fluid. For: 60:20:25:20.

[0061] The pretreatment liquid is composed of the following components in mass content: 3.5% AE-121 type cleaning agent and 96.5% water are stirred and mixed in the liquid mixing tank.

[0062] The pre-fluid is composed of the following components in mass content: 8.0% hydrochloric acid, 1.0% XT-05 drainage aid, 0.5% IS-130 corrosion inhibitor, 1.0% SCA iron ion stabilizer, 1.8% TH- 11 mutual solvent, 1.0% NH 4 Cl and the rest of the water are evenly stirred in the mixing tank.

[0063] The sand fixing and plugging removal treatment liquid is composed of the following components in mass content: 8% XT-68 sand fixing and plugging removal agent, 1.0% XT-05 drainage aid, 1.5% IS-130 corrosion inhibitor, 1.2% SCA iron ion stabilizer, 1.0% TH-11 mutual solvent, 1.7% N...

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Abstract

The invention relates to a sand consolidation and plugging removing treatment fluid for sand control of fine silt oil reservoir oil wells, a sand control treatment fluid system and a sand control method using the same, and belongs to the technical field of petroleum exploitation. The sand consolidation and plugging removing treatment fluid comprises the following components by mass: 8-12% of a sand consolidation and plugging removing agent, 0.5-1.5% of a drainage aid, 0.5-1.5% of a corrosion inhibitor, 1-2% of an iron ion stabilizer, 1-2% of mutual solvent, ammonium chloride and the balance ofwater. The sand control treatment fluid system is composed of a pretreatment liquid, a preflush, a treatment liquid and a replacement liquid, and the volume ratio is 4-6:1-2:2-3:1-2 in turn. The invention also disclose a sand control method using that sand control treatment fluid system. The synergistic effect of each component of the sand control treatment fluid system forms a bonding coating onthe surface of fine siltstone and clay grains, and sand is cemented and consolidated. After the implementation of this measure, the sand control and production increase effect is remarkable.

Description

technical field [0001] The invention relates to a sand-fixing and plugging-removing treatment liquid for fine silt sand reservoir oil well sand control, a sand control treatment liquid system and a sand control method using the same, belonging to the technical field of petroleum exploitation. Background technique [0002] In the process of oilfield development, some fine silt sand reservoirs with low cementation strength are often accompanied by sand production during the production process. For conventional sand production wells, conventional mechanical sand control methods can solve the problem, but some oil production wells are affected by sand production. It is fine silt, mud or clay, causing frequent pump jams and well workover. For this type of sand production, conventional mechanical sand control is more difficult. Even if the sand control is successful, the production of oil wells will decrease, and the ideal sand control purpose cannot be achieved. [0003] Chinese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/575
CPCC09K8/575
Inventor 刘约安李景全秦世群马兆斌杨学文张薇李莉李苗
Owner CHINA PETROLEUM & CHEM CORP
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