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Shale gas well cementation and oil displacement type flushing agent and preparation method thereof

A technology for shale gas well and flushing agent, which is applied in the field of materials, can solve the problems of not meeting the requirements of cementing quality, affecting the service life of shale gas wells of cement sheath integrity, and reducing the cementing quality of cementing stone.

Active Publication Date: 2021-01-12
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is difficult for cementing cement slurry to replace high-density oil-based drilling fluid. First, the "oleophilic" property of oil-based drilling fluid and the "hydrophilic" property of cementing cement slurry make the contact between the two easy to form a flocculation structure, resulting in cement It is difficult for slurry to displace oil-based drilling fluid; the second is that the oil-based drilling fluid adhered to the well wall and casing wall reduces the cementing quality of cement in the downhole annulus, affecting the integrity of the cement sheath and the service life of shale gas wells
[0004] At present, there are many types of cementing flushing fluids used for oil-based drilling fluids, which have a certain flushing effect on oil-based drilling fluids, but there are still certain limitations. Whether it is for the effective displacement and lubrication of high-density oil-based drilling fluids Neither the wet inversion nor the suppression of shale hydration after the annulus interface wet inversion can meet the requirements of cementing quality.

Method used

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  • Shale gas well cementation and oil displacement type flushing agent and preparation method thereof
  • Shale gas well cementation and oil displacement type flushing agent and preparation method thereof
  • Shale gas well cementation and oil displacement type flushing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A shale gas well cementing oil displacement flushing agent provided in this embodiment is prepared through the following steps:

[0065] Step 1. Add 100 parts of tap water into the reaction kettle, start stirring, heat up to 50°C, add 24 parts of emulsifier (which consists of 19.2 parts of cetearyl polyoxyethylene ether, 4.8 parts of fatty alcohol polyoxyethylene ether phosphate Potassium), so that the emulsifier is fully dissolved;

[0066] Step 2. Add 20 parts of co-emulsifier and stir for 30-50 minutes;

[0067] Step 3. Add 10 parts of hydration inhibitor (consisting of 1 part of polyethylene glycol, 6 parts of glucoside and 3 parts of oleyl alcohol polyoxyethylene ether), stir for 15-30 minutes, and cool to room temperature to obtain the shale Gas well cementing oil displacement flushing agent.

Embodiment 2- Embodiment 24

[0069] The specific components of the emulsifier, co-solvent, and hydration inhibitor in Examples 2-24 were adjusted, as shown in Table 1.

experiment example 1

[0098] The emulsifying ability of the flushing agent of each embodiment and comparative example to the base oil of shale gas oil-based drilling fluid is evaluated as follows:

[0099] The shale gas oil-based drilling fluid base oil is 5# white oil, and the flushing agent prepared in each embodiment and each comparative example is diluted with water to a concentration of 15 wt%. Mix 5# white oil with the diluent samples of each embodiment and each comparative example according to the volume ratio: 5:95, 10:90, 20:80, stir and mix at 2000r / min for 30min, observe the mixing state and stability Time, the data are shown in Table 2-Table 4. The emulsification effect of the flushing agent on the base oil is closely related to the oil displacement function of the flushing agent on the oil-based drilling fluid. The emulsification effect can be obtained through the mixing state and stability time.

[0100] Table 2

[0101]

[0102]

[0103] table 3

[0104]

[0105]

[01...

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Abstract

The invention discloses a shale gas well cementation and oil displacement type flushing agent. The shale gas well cementation and oil displacement type flushing agent comprises the following components in parts by weight: 100 parts of water, 24-48 parts of an emulsifier, 12-24 parts of a cosolvent and 6-12 parts of a hydration inhibitor, wherein the emulsifying agent comprises at least one of cetostearyl alcohol polyoxyethylene ether, propylene glycol block polyether and fatty alcohol-polyoxyethylene ether potassium phosphate; the cosolvent is prepared from isomeric alcohol polyoxyethylene ether and oleic acid polyoxyethylene ester in a weight ratio of (3-4): (1-2); the hydration inhibitor comprises polyethylene glycol, glucoside and / or oleyl alcohol polyoxyethylene ether. The shale gas well cementation and oil displacement type flushing agent can effectively displace high-density oil-based drilling fluid, interface wettability reversal is achieved, reservoir stability is guaranteed, and annulus well cementation quality is improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a shale gas well cementing oil displacement flushing agent and a preparation method thereof. Background technique [0002] In recent years, major breakthroughs have been made in the exploration and development of shale gas, which has become an important means of increasing reserves and production. Shale gas reservoirs generally adopt the combination of horizontal well drilling technology and volume fracturing technology. With the continuous increase of development efforts, the depth of the main reservoir and the length of the horizontal section continue to increase, and the requirements for cementing quality are getting higher and higher; organic shale is the main reservoir rock of shale gas, which is prone to hydration and poor stability. Features: In order to suppress the hydration expansion of shale, oil-based drilling fluid is used for drilling. As the well depth continues...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584C09K2208/12
Inventor 谢飞燕涂思琦敖康伟杨昆鹏邹双石凌龙高继超王建瑶赵宝辉曾建国谭文礼
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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