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High solid phase drilling fluid filter cake removal treating fluid

A drilling fluid and treatment fluid technology is applied in the field of drilling fluid filter cake and the treatment fluid field of removing high solid phase drilling fluid filter cake. , The effect of high glue breaking rate

Active Publication Date: 2009-12-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves the efficiency with which filters used for removing solids from oil or gas fluids during exploration operations. By optimizing different treatments together, it allows for effective filtering out of large amounts of water without causing damage on other areas within the borehole.

Problems solved by technology

This technical problem addressed in this patents is how to efficiently treat drill bit filters without causing harm when removing them after they have passed through their own passages. Current techniques involve either adding acids or other agents like calcium salt to weaken the filter material itself, making removal difficult if done before leaving behind residual deposits inside the pipe walls. Additionally, current solutions require multiple steps involving different types of equipment such as sandwich plugs or open bore completions, increasing costs associated with constructing these tools.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a well with a borehole diameter of 215.9mm, a well drilling depth of 2211m, a production layer thickness of 197m, and a formation porosity of 34.69%, the filter cake release operation is used as an example to describe in detail.

[0050] Prepare high-solid drilling fluid filter cake removal treatment fluid, which is respectively configured according to three treatment fluids: cleaning gel-breaking fluid, dissolution gel-breaking fluid and post-cleaning fluid.

[0051] (1) Prepare 15 t of cleaning gel-breaking liquid, calculated in parts by weight.

[0052] ① First prepare formation cleaning agent (A), mix xylene, petroleum ether, nonylphenol polyoxyethylene ether (HLB value 5, model OP-4), nonylphenol polyoxyethylene ether (HLB value 13, model OP-10) and 8-10 alcohol polyoxyethylene ether are mixed and stirred uniformly in a weight ratio of 2.2:1:0.3:0.3:0.2. Formation cleaning agent (A) is 4 parts in cleaning gel-breaking solution.

[0053] ②Preparation of cleanin...

Embodiment 2

[0074] In a well with a borehole diameter of 277.5mm, a well drilling depth of 1510m, a production layer thickness of 291.6m, and a formation porosity of 31%, the filter cake removal operation will be described in detail.

[0075] Prepare high-solid drilling fluid filter cake removal treatment fluid, which is respectively configured according to three treatment fluids: cleaning gel-breaking fluid, dissolution gel-breaking fluid and post-cleaning fluid.

[0076] (1) Prepare 30t of cleaning gel-breaking liquid, calculated in parts by weight.

[0077] ① First prepare formation cleaning agent (A), mix xylene, petroleum ether, nonylphenol polyoxyethylene ether (HLB value 5, model OP-4), nonylphenol polyoxyethylene ether (HLB value 13, model OP-10) and 8-10 alcohol polyoxyethylene ether are mixed and stirred uniformly in a weight ratio of 2.5:1:0.5:0.5:0.5. Formation cleaning agent (A) is 5 parts in cleaning gel-breaking liquid.

[0078] ②Preparation of cleaning gel breaking liqui...

Embodiment 3

[0098] In a well with a borehole diameter of 277.5mm, a well drilling depth of 1418m, a production layer thickness of 100m, and a formation porosity of 31%, the filter cake removal operation will be described in detail.

[0099] Prepare high-solid drilling fluid filter cake removal treatment fluid, which is respectively configured according to three treatment fluids: cleaning gel-breaking fluid, dissolution gel-breaking fluid and post-cleaning fluid.

[0100] (1) Prepare 10 t of cleaning gel-breaking liquid, calculated in parts by weight.

[0101] ① First prepare formation cleaning agent (A), mix xylene, petroleum ether, nonylphenol polyoxyethylene ether (HLB value 5, model OP-4), nonylphenol polyoxyethylene ether (HLB value 13, model OP-10) and 8-10 alcohol polyoxyethylene ether are mixed and stirred uniformly in a weight ratio of 2.5:1:0.5:0.5:0.5. Formation cleaning agent (A) is 5 parts in cleaning gel-breaking liquid.

[0102] ②Preparation of cleaning gel breaking liquid...

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Abstract

A high solid phase drilling fluid filter cake removal treating fluid is applied to the technical field of petroleum drilling and completion. The invention comprises three treating fluids, namely cleaning breaking liquid, dissolution breaking liquid and post cleaning liquid; the cleaning breaking liquid comprises the following components: dimethylbenzene, petroleum ether, nonylphenol polyoxyethylene ether (OP-4), nonylphenol polyoxyethylene ether (OP-10), 8-10 alcohol polyoxyethylene ether, ammonium persulphate, potassium chloride and water; the dissolution breaking liquid comprises the following components: acetic acid, hydrochloric acid, hydrofluoric acid, inhibiter SA1-3, ammonium citrate and water; the post cleaning liquid comprises the following components: dimethylbenzene, petroleum ether, nonylphenol polyoxyethylene ether (OP-4), nonylphenol polyoxyethylene ether (OP-10), 8-10 alcohol polyoxyethylene ether, potassium chloride and water. By cleaning breaking, dissolution breaking and post cleaning in three phases, drilling fluid filter cake is removed, the dissolution ratio of solid phase in the filter cake is greatly increased, and the dissolution ratio of organic positive glue drilling liquid filter cake is increased by 3.5 times, thus effectively dredging flow passage of reservoir stratum in immediate vicinity of horizontal well.

Description

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Claims

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Application Information

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Owner PETROCHINA CO LTD
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