Gel breaking solution and use thereof

A technology of glue and coagulant, which is applied in the field of glue breaking liquid, can solve the problems of nowhere to discharge waste low solid-phase polysulfonic drilling fluid, large particle size of broken colloid, environmental pollution, etc. Low cost of raw materials and the effect of reducing the overall cost of drilling

Active Publication Date: 2017-02-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of no place to discharge waste low-solid polysulfonate drilling fluid and environmental pollution after the implementation of drilling fluid "not falling to the ground", the present invention proposes a gel breaking fluid, which can completely break the waste low-solid phase polysulfonate drilling fluid and remove it. Stable, the solid-liquid layer is obvious after the gel is broken, the particle size of the broken colloid is large, strong, and it is in the shape of a micelle, no additional equipment is needed, the solid-liquid can be completely separated by using the existing solid control system of the well team, and the solid-liquid separation The liquid phase can be directly reused to prepare new drilling fluid, and the reuse rate reaches 100%. After the solid-liquid separation, the solid phase part is harmlessly treated by adding curing agent and drilling cuttings to meet the relevant environmental protection requirements.

Method used

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  • Gel breaking solution and use thereof
  • Gel breaking solution and use thereof
  • Gel breaking solution and use thereof

Examples

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Effect test

Embodiment 1

[0014] In order to overcome the problem of waste low-solid-phase polysulfonate drilling fluid nowhere to be discharged and environmental pollution after the drilling fluid "does not fall to the ground", the present invention proposes a gel breaking fluid, which includes the following components: by weight percentage, 10%- 30% coagulant, 1.0%-3.0% flocculant, 1.0%-5.0% solid-liquid separation agent, and the balance is water.

[0015] The gel breaking solution of the present invention is based on inorganic high molecular polymers, organic propylene-based copolymers, and modified cellulose polyamine salts. Toxic and biodegradable are environmentally friendly. It can break the glue and destabilize the abandoned low-solid polysulfonate drilling fluid glue-breaking formula of oil and gas wells in Changqing Oilfield, and realize solid-liquid separation by using the existing solid control system of the well team (no need to add additional equipment). The liquid technology is easy to ...

Embodiment 2

[0017] This embodiment provides a gel breaking solution, which comprises the following components by weight:

[0018] Coagulant: 20%

[0019] Flocculant: 2.5%

[0020] Solid-liquid separating agent: 3.0%

[0021] Water: 74.5%

[0022] Wherein, the coagulant is a mixture of polyaluminum sulfate and polyaluminum iron silicate, the weight ratio of polyaluminum sulfate and polyaluminum iron silicate is 3:2, both polyaluminum sulfate and polyaluminum iron silicate can be purchased in the market Purchase online, and polyaluminum sulfate is a high-quality product specified in the standard GB14591-93.

[0023] The flocculant is a copolymer of propylene oxide, ethylene oxide, and acrylamide, the weight ratio of propylene oxide, ethylene oxide, and acrylamide is 1:1:3, and the molecular weight of the copolymer is 10 million. The solid-liquid separating agent is carboxymethyl-propenyl-amino modified cellulose sodium salt, the copolymer of propylene oxide, ethylene oxide, acrylamide a...

Embodiment 3

[0058] This embodiment provides a gel breaking solution, which comprises the following components by weight:

[0059] Coagulant: 30%

[0060] Flocculant: 1.0%

[0061] Solid-liquid separating agent: 1.0%

[0062] Water: 68%

[0063] Wherein, the coagulant is a mixture of polyaluminum sulfate and polyaluminum iron silicate, the weight ratio of polyaluminum sulfate and polyaluminum iron silicate is 3:2, both polyaluminum sulfate and polyaluminum iron silicate can be purchased in the market Purchase online, and polyaluminum sulfate is a high-quality product specified in the standard GB14591-93.

[0064] The flocculant is a copolymer of propylene oxide, ethylene oxide, and acrylamide. The weight ratio of propylene oxide, ethylene oxide, and acrylamide is 1:1:3, and the molecular weight of the copolymer is 12 million. The solid-liquid separating agent is carboxymethyl-propenyl-amino modified cellulose sodium salt, the copolymer of propylene oxide, ethylene oxide, acrylamide and...

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Abstract

The invention provides a gel breaking solution. The gel breaking solution comprises, by weight, 10-30% of a coagulant, 1.0-3.0% of a flocculating agent, 1.0-5.0% of a solid-liquid separating agent and the balance water. The gel breaking solution has no corrosivity, no fluorescence, no chemical toxicity and no biotoxicity, is biodegradable and environmentally friendly, solves the technical problems of gel breaking, solid-liquid separation and recycling of a waste low-solid phase sulphonated polymer mud in a Changqing large-scale well drilling construction process and greatly reduces a well drilling comprehensive cost.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluid gel breaking, in particular to a gel breaking fluid and an application thereof. Background technique [0002] The Changqing Oilfield located in the Ordos Basin drills and completes thousands of wells every year, and generates millions of cubic meters of drilling fluid waste, which is basically piled up or buried in the well field, causing adverse impacts on the environment, for example, it may cause infiltration into the formation , affecting drinking water sources, soil and animal and plant growth. At the end of 2014, the new "Environmental Protection Law" was implemented, and then China National Petroleum Corporation issued the "Drilling Waste Fluid and Drill Cuttings Treatment Management Regulations (Provisional)", and Changqing Oilfield Branch issued the "Changqing Oilfield Drilling Waste Fluid and Drilling Cuttings Disposal Management Measures”, Ordos City also issued relevan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/26
Inventor 黎金明陈磊郑玉辉赵向阳曹辉郝超张潮张艺聪周强王勇强王国庆郭康张长庚
Owner BC P INC CHINA NAT PETROLEUM CORP
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