A water injection well profile control process using clean carrier fluid to prepare oily sludge plugging agent

A technology for carrying liquid and oily sludge, which is applied in the direction of wellbore/well components, drilling composition, chemical instruments and methods, etc. It can solve the profile control technology that is complex in configuration, cannot improve water injection efficiency, and restricts oily sludge Promotion and other issues to achieve the effects of improving recovery, solving the demand for profile control and plugging agents, and solving the problem of pollution sources

Active Publication Date: 2020-12-01
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, oily sludge can be pumped into oily reservoirs in the form of reinjection. The most effective method is oily sludge profile control technology. Conventional oily sludge profile control can solve the problem of waste reuse of oily sludge, but With the development of technology, the conventional oily sludge profile control agent needs to add sludge flotation agent, sludge dispersant and crosslinking agent. The configuration is complicated, and additives need to be added one by one. Each one needs to be evenly mixed before adding the next additive. Moreover, the conventional oily sludge profile control agent simply plugs the reservoir and cannot improve the water injection efficiency. These factors restrict the promotion of oily sludge profile control technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A water injection well profile control process for preparing an oily sludge plugging agent with a clean carrier fluid, the process includes the following steps:

[0023] Step 1): Use the oily sludge as the main agent of the oily sludge plugging agent for standby;

[0024] Step 2): Prepare the cleaning carrier liquid; use the prepared cleaning carrier liquid as the suspending agent of the oily sludge plugging agent;

[0025] Step 3): Mix the oily sludge in step 1) with the cleaning carrier fluid in step 2), wherein the mass ratio of the oily sludge is 5% to 25%, and the balance is cleaning carrier fluid; stir with a stirring device, place After more than 30 days, a stable oily sludge suspension is formed; it is an oily sludge plugging agent;

[0026] Step 4): The prepared oily sludge plugging agent is further diluted with water according to the technical requirements for profile control of water injection wells into a plugging agent that meets the technical requirements...

Embodiment 2

[0029] A water injection well profile control process for preparing an oily sludge plugging agent with a clean carrier fluid, the process includes the following steps:

[0030] Step 1): Use the oily sludge as the main agent of the oily sludge plugging agent for standby;

[0031] Step 2): Prepare the cleaning carrier liquid; use the prepared cleaning carrier liquid as the suspending agent of the oily sludge plugging agent; the prepared cleaning carrier liquid: is made of 0.5% dimethyl didocosyl ammonium chloride, 0.2 %1-amino-4-naphthalenesulfonate sodium, 0.5%KCl and 98.8%H 2 O is mixed according to the above mass ratio.

[0032] Step 3): Mix the oily sludge in step 1) with the cleaning carrier solution in step 2), wherein the mass ratio of the oily sludge is 5%, and the mass ratio of the cleaning carrier solution is 95%; stir with a stirring device, place After more than 30 days, a stable oily sludge suspension is formed; it is an oily sludge plugging agent;

[0033] Step ...

Embodiment 3

[0036] On the basis of Example 2, the difference is: step 3): mix the oily sludge of step 1) with the cleaning carrier fluid of step 2), wherein the mass ratio of the oily sludge is 25%, and the cleaning carrier fluid The mass ratio is 75%; it is stirred by stirring equipment and left for more than 30 days to form a stable oily sludge suspension; it is an oily sludge plugging agent.

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PUM

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Abstract

The invention relates to a water injection well profile control technology of using a clean carrying fluid to prepare an oil containing sludge plugging agent. The technology comprises following steps:(1) taking oil containing sludge as a main agent of the oil containing sludge plugging agent, and saving oil containing sludge for later use; (2) preparing a clean carrying fluid, and taking the clean carrying fluid as a suspension agent of the oil containing sludge; (3) mixing the oil containing sludge with the clean carrying fluid, wherein the oil containing sludge accounts for 5 to 25 wt.% ofthe plugging agent, and the balance being the clean carrying fluid, stirring the mixture by a stirring facility, and storing the mixture for at least 30 days to form stable oil containing sludge suspension, namely the oil containing sludge plugging agent; (4) according to the technical requirements of water injection well profile control, diluting prepared oil containing sludge plugging agent by water to obtain a plugging agent that meets the technical requirements, and injecting the obtained plugging agent into a water injection well by a pump facility; and (5) after pumping, closing the wellfor 3 to 5 days, then connecting a water injection pipeline to the well, and carrying out water injection. The provided technology is environmentally friendly.

Description

technical field [0001] The invention relates to a water plugging and profile control operation used in the exploitation of oil and gas fields, in particular to a water injection well profile control process for preparing an oily sludge plugging agent with a clean carrier fluid. It belongs to the field of oil exploitation. Background technique [0002] Oily sludge is a mixture of inorganic and organic matter. It has a complex composition, but its chemical properties are relatively stable. Its appearance is black or brown-black according to different oil reservoirs. It is viscous and semi-solid after long-term storage. It is mainly composed of emulsified crude oil, water and solid particles. It is mainly produced in the links of crude oil treatment, station and warehouse gathering and transportation system, drilling, downhole operation, etc. It is one of the main pollution sources in the oilfield development process. [0003] At present, oily sludge can be pumped into oily re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/506E21B33/13
CPCC09K8/506E21B33/13
Inventor 陈柯全李刚
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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