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Waste drilling mud recycling water shut-off and profile control technique

A technology of waste mud, water plugging and profile control, applied in chemical instruments and methods, water/sludge/sewage treatment, earth square drilling and mining, etc., can solve the problems of failure to meet the plugging and adjusting process requirements, unstable accumulation volume, and clay dispersion and other problems, to achieve the effect of reducing the cost of the blockage adjustment process, improving the effect of the blockage adjustment process, and simplifying the recovery process

Active Publication Date: 2014-11-19
山东华曦石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the waste mud is directly injected into the formation, it is easily washed and diluted by the action of groundwater dynamics, especially in the maintenance stage after the injection is stopped, which is unstable and affects the sealing effect, and with subsequent water invasion, the repulsion between crystal layers is greater than When connecting force. Nianshi particles are separated along the layer, and the dispersion of clay appears. The overall performance is that the accumulation volume is unstable, the stability is poor, the plugging strength is low, the anti-scourability is poor, and the effective period of the measures is short.
Therefore, the single use of waste mud as a water plugging and profile control agent cannot meet the plugging and adjustment process requirements; therefore, it is necessary to deploy waste mud to meet the plugging performance requirements as an inorganic plugging agent

Method used

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Effect test

Embodiment 1

[0025] Embodiment 1: A kind of drilling waste mud reuse water plugging and profile control process method mentioned in the present invention comprises the following steps:

[0026] (a) Use the high-pressure sewage gun 2 to disperse the waste mud in the waste mud pool 1 to make it have a certain fluidity and suspension, and establish a circulation inside the waste mud pool 1. When the mud density in the waste mud pool 1 When it is relatively uniform and the suspension is good, enter the next step;

[0027] (b) Use a small crane 3 to lower the submersible mud pump 4 into the bottom of the abandoned mud pool 1, use the impeller of the pump body to fully stir, connect the outlet of the submersible mud pump 4 to the mud tanker 5, and the mud tanker 5 will transport the recovered mud Go to the water plugging and profile control site; repeat pumping in this way until the waste mud in the waste mud pool 1 is pumped clean, and the clean waste mud pool 1 can be backfilled directly with ...

Embodiment 2

[0035] Embodiment 2: A process method for recycling waste drilling mud for water plugging and profile control mentioned in the present invention, wherein the agents prepared at the scene of water plugging and profile control are divided into three types according to their uses: mud early-strength water reducer, mud Stabilizer and mud strengthening agent, the mud early-strength superplasticizer is composed of sodium aluminate, calcium sulfate, and calcium oxide, the proportion is 0.5:1.5:0.5, and the use concentration is 2% of the mud mass fraction; The mud stabilizer is composed of sodium carbonate, sodium sulfite, sodium lignosulfonate, and phenolic resin, the ratio of which is 1.5:2.5:0.5:1.5, and the use concentration is 5‰ of the mud mass fraction; the strengthening agent is composed of silicic acid It is composed of sodium, diethanolamine and ammonium chloride. The ratio is 2.5:0.5:1.5, and the concentration used is 2% of the mud mass fraction.

Embodiment 3

[0036] Embodiment 3: A process method for recycling waste drilling mud for water plugging and profile control mentioned in the present invention, wherein the agents prepared at the scene of water plugging and profile control are divided into three types according to their uses: mud early strength water reducer, mud Stabilizer and mud strengthening agent, the mud early-strength superplasticizer is composed of sodium aluminate, calcium sulfate, and calcium oxide, and its proportion is 1.5:0.5:1.5, and the use concentration is 3% of the mud mass fraction; The mud stabilizer is composed of sodium carbonate, sodium sulfite, sodium lignosulfonate, and phenolic resin, the ratio of which is 2.5:1.5:1.5:0.5, and the use concentration is 6‰ of the mud mass fraction; the strengthening agent is composed of silicic acid Sodium, diethanolamine, ammonium chloride, the ratio is 1.5:1.5:0.5, the concentration used is 3% of the mud mass fraction.

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Abstract

The invention relates to a waste drilling mud recycling water shut-off and profile control technique. The waste drilling mud recycling water shut-off and profile control technique comprises the following steps of scattering waste mud in a waste mud pond by using a high-pressure sewage gun; descending a submerged mud pump to the waste mud pond by using a small crane and stirring the waste mud by using the submerged mud pump; carrying recycled mud to a water shut-off and profile control field by using a mud tank truck; adding chemicals in the waste mud and blending the waste mud into water shut-off and profile control plugging agents; pumping the water shut-off and profile control plugging agents into a stirring tank; sufficiently stirring and curing the mud by using a stirrer; and injecting the mud into an oil-water well by using an intelligent profile control injection pump according to the amount of design in three slugs comprising an early strength slug, a main body slug and a sealing slug and performing a water shut-off and profile control process. The waste drilling mud recycling water shut-off and profile control technique has the advantages that environmental pollution of the waste mud is eliminated when the waste mud is not solidified; the recycled mud pond is not required to be solidified; a large amount of mud solidifying cost is saved; the recycled waste mud serves as inorganic plugging agents after being blended; remote plugging in deep positions of a stratum is realized; and the whole water shut-off and profile control effect is improved.

Description

technical field [0001] The invention relates to the utilization of hazardous waste discharged during the drilling process of oil and gas fields, in particular to a process method for recycling waste drilling mud for water plugging and profile control. Background technique [0002] During the exploitation and drilling of oil and natural gas, a large amount of drilling waste mud is produced, and almost all the waste on the construction site is discharged and accumulated in the waste mud pool, which complicates the harmful components in the drilling waste, and finally forms a Multiphase suspended drilling waste mud composed of sodium soil, weighted materials, various chemical treatment agents, sewage, dirty oil and drilling cuttings. Drilling waste mud is very harmful to the environment. At present, tens of thousands of wells are drilled every year in China, and the most commonly used method for waste mud treatment is the solidification method. This method needs to wait until m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/06E21B43/22C02F11/00C09K8/508
Inventor 薛炳平
Owner 山东华曦石油技术服务有限公司
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