Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof

A technology of carbon dioxide and enhanced oil recovery, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of wax deposition on the inner wall of oil pipes, affecting production, polluting formations, etc., and achieves low price, simple method, The effect of reducing the sticking rate

Active Publication Date: 2011-05-04
DAQING JINJUN PETROLEUM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbon dioxide huff and puff enhanced oil recovery is an oil enhancement technology that has emerged in recent years. However, since the temperature of carbon dioxide injection is lower than minus 20°C and the injection time is about 10 hours, it is easy to cause serious wax deposition on the inner wall of the tubing, resulting in well jamming.
At present, to solve the problem of well stuck in carbon dioxide injection construction, the method of hot washing is mainly used. This method not only pollutes the formation but also affects production, and it is expensive

Method used

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  • Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof
  • Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof
  • Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The following components are prepared according to the mass percentage ratio of the anti-stick liquid: 40% ethylene glycol, 3% carbon dioxide corrosion inhibitor, 5% anti-swelling agent, 2% anti-scaling agent, 2% surfactant, and the balance is water, and mix the components evenly to prepare the anti-stick liquid.

[0023] like figure 1 , figure 2 As shown, first open the wellhead casing gate to vent the casing gas; install pressure gauge 1, check valve 2, valve 3, and chemical inflow device at the wellhead casing mouth, and the two ends of valve 3 are fixed and sealed by clamps and clamp pieces , a pressure gauge is installed to observe the bottom-hole pressure to prevent the bottom-hole pressure from being too large; the above-mentioned anti-rod sticking liquid of the prepared medicine is added into the medicine inflow device, and the structure of the medicine inflow device is that the upper part is a dosing funnel 6 , the bottom opening of the dosing funnel 6 is r...

Embodiment 2

[0025] The following components are prepared in the proportioning ratio of the following components to prevent sticking liquid: 50% ethylene glycol, 5% carbon dioxide corrosion inhibitor, 5% anti-swelling agent, 2% anti-scaling agent, and 2% surfactant. Divide and mix evenly to prepare anti-rod stuck liquid.

[0026] First, open the wellhead casing gate to vent the casing gas; install a pressure gauge, a check valve, a valve, and a chemical inflow device at the wellhead casing mouth, and the two ends of the valve are fixed and sealed by clamps and clamp pieces; image 3 As shown, use a tank truck to transport the medicine, put the liquid outlet of the tank truck into the inflow device, and add the above prepared medicine anti-rod jam liquid into the medicine inflow device through the liquid outlet of the tank car, during the process of filling the medicine The medium pumping unit does not stop. When a large amount of anti-rod jam fluid appears at the wellhead, stop the pumping...

Embodiment 3

[0028] The following components are proportioned according to mass percentage to prepare the anti-stick liquid: 45% ethylene glycol, 4% carbon dioxide corrosion inhibitor, 5% anti-swelling agent, 2% anti-scaling agent, 2% surfactant, and the balance is water, and mix the components evenly to prepare the anti-stick liquid.

[0029] First, open the wellhead casing gate to vent the casing gas; install a pressure gauge, a check valve, a valve, and a chemical inflow device at the wellhead casing port, and the two ends of the valve are fixed and sealed by clamps and clamp pieces; Add the anti-rod jam fluid into the agent inflow device, and the pumping unit does not stop during the injection process. When a large amount of anti-rod jam fluid appears at the wellhead, stop the pumping unit at the bottom dead center; then remove the device for injecting the agent, Close the wellhead casing.

[0030] All the compounds used in the above examples are commercially available.

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Abstract

The invention discloses rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and an injection method thereof, which mainly solve the problem of well blockage caused by a large quantity of paraffin deposits on the inner wall of an oil pipe during carbon dioxide huff-puff enhanced oil recovery operation. The rod blockage prevention liquid comprises the following components in percentage by mass: 40 to 50 percent of glycol, 3 to 5 percent of carbon dioxide corrosion inhibitor, 5 percent of anti-expanding agent, 2 percent of anti-scaling agent, 2 percent of surfactantand the balance of water. A pressure gauge (1), a one-way valve (2), a valve (3) and an agent feeder are arranged at the port of a well mouth casing; the rod blockage prevention liquid is injected into a well through the agent feeder; a pumping unit is not stopped during the injection of the agents; when a large amount of rod blockage prevention liquid occurs at the well mouth, the pumping unit is stopped at a lower dead point; and an agent injection device is disassembled and the port of the well mouth casing is closed well. The rod blockage prevention liquid can soften the paraffin depositsin the oil pipe and prevent well blockage; and the injection method of the rod blockage prevention liquid is simple, is easy to operate and is low in cost.

Description

technical field [0001] The invention relates to an anti-rod stuck fluid for oil recovery in an oil field and a filling method thereof, in particular to an anti-rod stuck fluid for enhanced oil recovery with carbon dioxide huff and puff and a filling method thereof. Background technique [0002] Carbon dioxide huff and puff enhanced oil recovery is an oil enhancement technology that has emerged in recent years. However, since the temperature of carbon dioxide injection is lower than minus 20°C and the injection time is about 10 hours, it is easy to cause severe wax deposition on the inner wall of the tubing, resulting in well jamming. At present, to solve the well stuck problem in the carbon dioxide injection construction, the method of operation hot washing is mainly used. This method not only pollutes the formation and affects production, but also costs a lot. Contents of the invention [0003] The present invention aims to overcome the problem in the background technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/54E21B37/06E21B41/02
Inventor 赵金树李召兵
Owner DAQING JINJUN PETROLEUM TECH DEV CO LTD
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