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Filter cake cleaning fluid and preparation method thereof

A cleaning fluid and filter cake technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as unfavorable wellbore stability, ensuring cementing quality, restricting the use of cleaning fluids, and damaging reservoir fluids, etc. The effect of improving the bonding strength of the second interface of cementing, improving the bonding strength of the second interface and enhancing the quality of cementing

Active Publication Date: 2015-01-14
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the existing filter cake treatment fluids can only be used for cleaning the filter cake formed by water-based drilling fluid
[0007] 2. For oil-based drilling fluid filter cake cleaning, oil-based drilling fluid is required to be aggravated by limestone, which limits the use of cleaning fluid
[0008] 3. Although these technologies have certain advantages and effects, due to their strong reactivity and poor specificity, they will also damage the drilling tools and damage the reservoir fluid while cleaning the filter cake.
[0009] 4. These technologies are not conducive to the stability of the well wall and the quality of cementing after cleaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 350ml white oil, add 0.15% sodium dodecylbenzenesulfonate, 5% fast penetrating agent T, 8% emulsifier, 3% wetting agent alkyltrimethylammonium bromide and 150ml aqueous solution in sequence, fully Stir to prepare filter cake cleaning solution.

[0020] Prepare diesel-based drilling fluid, the formula is: 400ml diesel oil + 3% primary emulsifier + 2% auxiliary emulsifier + 3% wetting agent + 2.5% KP-31 + 100ml water (30%CaCl 2 ) + 2.5% CaO + 2% aluminum stearate + 6% genuine fluid loss additive + barite weighted to a density of 1.1g / cm 3 After pressing the prepared diesel-based drilling fluid on the medium-pressure filter water loss instrument for 30 minutes, the filter cake was soaked in the prepared filter cake cleaning solution for 24 hours, and the mass change before and after the filter cake was recorded.

[0021] The initial filter cake mass was 2.89g, the final filter cake mass was 0.18g, and the filter cake cleaning rate was 93.7%.

Embodiment 2

[0023] As described in Example 1, the difference is: the mass percentage of sodium dodecylbenzenesulfonate in the prepared filter cake cleaning solution is 0.2%. The initial filter cake mass is 3.10g, the final filter cake mass is 0.18g, and the filter cake cleaning rate is 94.2%.

Embodiment 3

[0025] As described in Example 1, the difference is that the mass percentage of sodium dodecylbenzenesulfonate is 0.25%. The initial filter cake mass is 2.75g, the final filter cake mass is 0.10g, and the filter cake cleaning rate is 96.4%.

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Abstract

The invention belongs to the technical field of oil and gas well engineering, and particularly relates to an efficient filter cake cleaning liquid and a preparation method thereof, and the efficient filter cake cleaning liquid can be used for cleaning drilling fluid filter cake and can increase well cementation two interface cementing strength. The technical scheme of the filter cake cleaning liquid is as follows: the filter cake cleaning liquid comprises the following components: base oil, an aqueous solution, 4.15%-6.25% by mass of a surface active agent, 6%-8% by mass of an emulsifier, and 3%-4% by mass of a wetting agent; wherein the base oil uses white oil as a filter cake cleaning fluid continuous phase, a dispersing phase is the aqueous solution, and the volume ratio of oil to water is 7:3-8:2. The technical scheme adopts a base oil / surface active agent system to clean the filter cake to achieve the purpose of improve the well cementation two interface cementing strength and remove blocking.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well engineering, and in particular relates to a high-efficiency filter cake cleaning liquid used for cleaning the drilling fluid filter cake and improving the bonding strength of the cementing interface. Background technique [0002] In the development of mud shale reservoirs in unconventional oil and gas reservoirs, since mud shale is composed of a variety of clay minerals, it is easy to absorb water and hydrate and expand when it meets water, resulting in instability of the well wall. The diameter is too large and the well diameter is extremely irregular, which brings great difficulties and hidden dangers to the lowering of the casing, the centering of the casing, the displacement of the drilling fluid by the cement slurry, and the safety of the cementing and injection construction. In order to solve the above problems, oil-based drilling fluids are widely used in drilling construction. In...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524C09K8/528
Inventor 张海青陈二丁成效华李蕾祁亚男刁振涛王俊赵红香
Owner CHINA PETROCHEMICAL CORP
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