CN115386350B - Method for preparing drilling fluid from water-based drilling hydraulic filtrate - Google Patents

Abstract

The invention discloses a method for preparing drilling fluid by using water-based drilling fluid filtrate, which comprises the following steps: (1) analysis of filtrate: determination of Cl in Water-based drilling Hydraulic filtrate ^‑ 、Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ Whether the content meets the corresponding index; (2) If the index is not met, adding water into the water-based drilling hydraulic filtrate until the index is met; if the index is met, adding the following additives in percentage by mass of the total mass of the water-based drilling hydraulic filtrate into the water-based drilling hydraulic filtrate meeting the index: the additive comprises 0.2-0.8% of polymer filtrate reducer, 3-8% of sulfonated phenolic resin, 1-8% of sulfonated lignite, 1-6% of emulsified asphalt and 4% of bentonite. The invention has the advantages of simple process, good flexibility and adaptability, low cost and excellent performance of various indexes of the prepared drilling fluid.

Description

Method for preparing drilling fluid from water-based drilling hydraulic filtrate

Technical Field

The invention relates to the technical field of petroleum drilling fluid preparation, in particular to a method for preparing drilling fluid by using water-based drilling fluid filtrate.

Background

The drilling fluid is subjected to solid-liquid separation treatment, and the produced liquid waste contains various metal ions, chemical treatment agents, oil, sewage, ore powder and other substances, so that the drilling fluid has high environmental pollution, cannot be directly discharged, needs professional sewage treatment, is limited by the treatment conditions of a drilling construction site, and has poor treatment effect. At present, the domestic main treatment method is to transfer the field filtrate to a sewage treatment plant for treatment by using a tank car, and the sewage treatment plant needs to be established in a work area, so that the treatment cost is high, the difficulty is high, and the construction cost is increased.

Patent No. 201910730260.7 discloses a method for treating a press filtration liquid, which comprises the steps of adding a deionized chelating agent into the press filtration liquid at normal temperature, and continuously stirring until the deionized chelating agent and all metal ions in the press filtration liquid are subjected to chelation reaction; wherein the deionized chelating agent is a compound product of a citric acid-beta-cyclodextrin copolymer and sodium gluconate; the filter pressing liquid treatment method is simple and effective, and the deionized chelating agent obtained by compounding the citric acid-beta-cyclodextrin copolymer and the sodium gluconate can form stable chelates with various metal ions in the filter pressing liquid, so that the filter pressing liquid can be repeatedly utilized without carrying out subsequent conventional standing and filtering, and the time and the treatment cost for on-site treatment of the filter pressing liquid are effectively saved. The above method still has the following problems: the free state deionized chelating agent exists in the treated press filtrate, and the free state ion chelating agent has negative influence on the stability of a drilling fluid system because the water-based drilling fluid is a complex dispersion; the deionized chelating agent and metal ions have chelating reaction, stirring treatment is needed, and the treatment period is long; a stirring treatment tank is required, the field space is limited, and the treatment condition is not met; the use of a deionized chelating agent increases the cost of the process; cannot remove Cl in the filtrate ^- 。

And in the actual production process, cl in the filtrate of different drilling pressures ^- 、Ca ²⁺ The content difference is large, the treatment method adopts what kind of additive, the control of the additive addition amount under different conditions can directly influence the performance of the drilling fluid, and how to effectively treat the water-based drilling fluid filtrate with low cost and short period is a technical problem to be solved by the technicians in the field.

Disclosure of Invention

The invention aims to solve the technical problems and provide a method for preparing the drilling fluid by using the water-based drilling fluid filtrate, which has the advantages of simple process, good flexibility and adaptability, low cost and excellent index performance of the prepared drilling fluid.

The technical scheme comprises the following steps:

(1) Filtrate analysis: determination of Cl in Water-based drilling Hydraulic filtrate ^- 、Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ Whether the content meets the following index;

the index is Cl in the water-based drilling hydraulic filtrate ^- ≤30000mg/L、Ca ²⁺ 400mg/L or more, 200mg/L or less of aluminum ions or less, and 100mg/L or less of iron ions;

(2) If the index is not met, adding water into the water-based drilling hydraulic filtrate until the index is met;

if the index is met, adding the following additives in percentage by mass of the total mass of the water-based drilling hydraulic filtrate into the water-based drilling hydraulic filtrate meeting the index:

the additive comprises 0.2-0.8% of polymer filtrate reducer, 3-8% of sulfonated phenolic resin, 1-8% of sulfonated lignite, 1-6% of emulsified asphalt and 4% of bentonite.

In step (2), cl is contained in the water-based drilling fluid filtrate according to the meeting index ^- 、Ca ²⁺ The additives with different proportions are added in different content ranges, and the specific steps are as follows:

①20000mg/L＜Cl ^- ≤30000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.7 to 0.8 percent of polymer filtrate reducer, 7 to 8 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 5 to 6 percent of emulsified asphalt and 4 percent of bentonite;

②20000mg/L＜Cl ^- ≤30000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 4 to 5 percent of emulsified asphalt and 4 percent of bentonite;

③10000mg/L＜Cl ^- ≤20000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 7 to 8 percent of sulfonated lignite, 3 to 4 percent of emulsified asphalt and 4 percent of bentonite;

④10000mg/L＜Cl ^- ≤20000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.3 to 0.4 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 5 to 6 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑤0mg/L＜Cl ^- ≤10000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.4 to 0.5 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 2 to 3 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑥0mg/L＜Cl ^- ≤10000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.2 to 0.3 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 1 to 2 percent of sulfonated lignite, 1 to 2 percent of emulsified asphalt and 4 percent of bentonite.

The inventors have found that Cl ^- The content of (2) affects the zeta potential of clay particles, thereby affecting the chargeability of dispersed colloidal particles, causing the increase of the dispersion values of apparent viscosity, plastic viscosity and dynamic shear force, and causing the disturbance of the whole system and the loss of rheological property; while Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ By mixing with bentonite Na ⁺ The bentonite is exchanged, so that the hydration capability of the bentonite is weakened, the dispersity is low, the fluid loss of drilling fluid is increased, the rheological property is poor, solid-liquid layered precipitation occurs, and the production requirement cannot be met. Therefore, there is a need to first determine Cl in water-based drilling fluid filtrates ^- 、Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ If the content meets the corresponding index, the water-based drilling hydraulic filtrate is configured on the premise of meeting the corresponding index, and if the different indexes are met, the water-based drilling hydraulic filtrate can be used for meeting the indexes in a water mixing mode, and then the next configuration is performed.

The additive comprises a polymer filtrate reducer, sulfonated phenolic resin, sulfonated lignite, emulsified asphalt and bentonite, wherein the polymer filtrate reducer can improve the viscosity and the tangential degree of drilling fluid and reduce the API filtrate loss; the sulfonated phenolic resin can reduce HPHT filtrate loss of the drilling fluid; the sulfonated lignite can effectively control the filtration and viscosity of the drilling fluid; the emulsified asphalt can improve the quality of mud cakes and improve the lubricating performance.

Further studies have found that the content of Cl is different ^- Ions have different effects on the water-based drilling fluid filtrate, when Cl ^- Less than or equal to 10000mg/L, has less influence on the performance fluid loss of drilling fluid, mainly increases the APIFL fluid loss with the increase of concentration, and mainly controls the content of polymer fluid loss additive to adjust. 10000mg/L < Cl ^- The APIFL loss of the drilling fluid is increased, the rheological property is poor, the viscosity is increased, the bubble content of the drilling fluid is high, and the content of sulfonated lignite is controlled to be adjusted. 20000mg/L < Cl ^- The filtration loss of the drilling fluid HPHTFL is obviously increased and the quality and sedimentation stability of mud cakes are poor under the high temperature condition, and the content of sulfonated phenolic resin and emulsified asphalt is controlled to be adjusted. Cl ^- More than or equal to 30000mg/L, the drilling fluid system is extremely unstable, the performance is difficult to maintain, and the well condition is easy to be complicated.

On the other hand, ca at different contents ²⁺ Ions can also bring different influences on the configuration of the drilling fluid by the water-based drilling fluid filtrate, ca ²⁺ The viscosity of the clay particles is reduced by using a polymer filtrate reducer, and the clay particles are protected. 200mg/L < Ca ²⁺ The APIFL filtrate loss of the drilling fluid is increased and the fluidity is deteriorated by less than or equal to 400mg/L, and the water loss is reduced and the flow pattern is regulated mainly by using sulfonated lignite. Ca (Ca) ²⁺ The APIFL filtration loss of the drilling fluid is increased steeply and the phenomena of caking, precipitation and the like are generated, so that the performance is difficult to maintain.

Therefore, in making a water-based drilling fluid filtrate configuration, it is necessary to comprehensively consider Cl ^- 、Ca ²⁺ Based on different contents, the addition amounts of the components of the additives are correspondingly adjusted so that the prepared drilling fluid always maintains excellent performance, and is flexibly applicable to different water-based drilling hydraulic filtrates on the premise of reducing water consumption cost.

The invention has the advantages of simple treatment process, short production period, no complex reaction process, good flexibility and adaptability, low cost, excellent performance of various indexes of the prepared drilling fluid and meeting the recycling standard.

Detailed Description

The process of the present invention comprises the following steps, wherein all additives are commercially available:

(1) Filtrate analysis: determination of Cl in Water-based drilling Hydraulic filtrate ^- 、Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ Whether the content meets the following index;

the index is Cl in the water-based drilling hydraulic filtrate ^- ≤30000mg/L、Ca ²⁺ 400mg/L or more, 200mg/L or less of aluminum ions or less, and 100mg/L or less of iron ions;

(2) If the index is not met, adding water into the water-based drilling hydraulic filtrate until the index is met;

if the index is met, adding the following additives in percentage by mass of the total mass of the water-based drilling hydraulic filtrate into the water-based drilling hydraulic filtrate meeting the index:

the additive comprises 0.2 to 0.8 percent of polymer filtrate reducer (polyacrylamide PAM) +3 to 8 percent of sulfonated phenolic resin+1 to 8 percent of sulfonated lignite+1 to 6 percent of emulsified asphalt and 4 percent of bentonite.

Specifically, cl in the water-based drilling hydraulic filtrate meeting the index ^- 、Ca ²⁺ The additives with different proportions are added in different content ranges, and the specific steps are as follows:

①20000mg/L＜Cl ^- ≤30000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.7 to 0.8 percent of polymer filtrate reducer, 7 to 8 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 5 to 6 percent of emulsified asphalt and 4 percent of bentonite;

②20000mg/L＜Cl ^- ≤30000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 4 to 5 percent of emulsified asphalt and 4 percent of bentonite;

③10000mg/L＜Cl ^- ≤20000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 7 to 8 percent of sulfonated lignite, 3 to 4 percent of emulsified asphalt and 4 percent of bentonite;

④10000mg/L＜Cl ^- ≤20000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.3 to 0.4 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 5 to 6 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑤0mg/L＜Cl ^- ≤10000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.4 to 0.5 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 2 to 3 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑥0mg/L＜Cl ^- ≤10000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.2 to 0.3 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 1 to 2 percent of sulfonated lignite, 1 to 2 percent of emulsified asphalt and 4 percent of bentonite.

Experimental example:

(1) Experimental example 1:

(1) water-based drilling fluid filtrate: cl ^- The content is as follows: 30706mg/L, ca ²⁺ The content is as follows: 510mg/L, al ³⁺ The content is as follows: 158mg/L, fe ²⁺ The content is as follows: 80mg/L;

(2) adding 30% on-site water (volume parts);

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 23780mg/L, ca ²⁺ The content is as follows: 388mg/L, al ³⁺ The content is as follows: 122mg/L, fe ²⁺ The content is as follows: 68mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.7% of polymer filtrate reducer, 8% of sulfonated phenolic resin, 4% of sulfonated lignite, 5% of emulsified asphalt and 4% of bentonite;

(5) the performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

(2) Experimental example 2:

(1) water-based well drillingHydraulic filtrate: cl ^- The content is as follows: 34864mg/L, ca ²⁺ The content is as follows: 138mg/L, al ³⁺ The content is as follows: 121mg/L, fe ²⁺ The content is as follows: 94mg/L;

(2) 25% on-site water (parts by volume) was added;

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 28670mg/L, ca ²⁺ The content is as follows: 123mg/L, al ³⁺ The content is as follows: 105mg/L, fe ²⁺ The content is as follows: 32mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.6% of polymer filtrate reducer, 5% of sulfonated phenolic resin, 3% of sulfonated lignite, 4% of emulsified asphalt and 4% of bentonite;

(5) the performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

(3) Experimental example 3:

(1) water-based drilling fluid filtrate: cl ^- The content is as follows: 18056mg/L, ca ²⁺ The content is as follows: 408mg/L, al ³⁺ The content is as follows: 210mg/L, fe ²⁺ The content is as follows: 71mg/L;

(2) 15% on-site water (parts by volume) was added;

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 16339mg/L, ca ²⁺ The content is as follows: 373mg/L, al ³⁺ The content is as follows: 186mg/L, fe ²⁺ The content is as follows: 66mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.6% of polymer filtrate reducer, 6% of sulfonated phenolic resin, 7% of sulfonated lignite, 3% of emulsified asphalt and 4% of bentonite;

(5) the performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

(4) Experimental example 4:

(1) water-based drilling fluid filtrate: cl ^- The content is as follows: 14850mg/L, ca ²⁺ The content is as follows: 176mg/L, al ³⁺ The content is as follows: 221mg/L, fe ²⁺ The content is as follows: 111mg/L;

(2) adding 20% of on-site water (volume parts);

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 15800mg/L, ca ²⁺ The content is as follows: 159mg/L, al ³⁺ The content is as follows: 191mg/L, fe ²⁺ The content is as follows: 95mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.4% of polymer filtrate reducer, 5% of sulfonated phenolic resin, 6% of sulfonated lignite, 3% of emulsified asphalt and 4% of bentonite;

(5) the performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

(5) Experimental example 5:

(1) water-based drilling fluid filtrate: cl ^- The content is as follows: 10115mg/L, ca ²⁺ The content is as follows: 475mg/L, al ³⁺ The content is as follows: 104mg/L, fe ²⁺ The content is as follows: 107mg/L;

(2) 25% on-site water (parts by volume) was added;

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 8734mg/L, ca ²⁺ The content is as follows: 394mg/L, al ³⁺ The content is as follows: 93mg/L, fe ²⁺ The content is as follows: 96mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.5% of polymer filtrate reducer, 4% of sulfonated phenolic resin, 2% of sulfonated lignite, 3% of emulsified asphalt and 4% of bentonite;

(5) the performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

(6) Experimental example 6:

(1) water-based drilling fluid filtrate: cl-content: 7855mg/L, ca ²⁺ The content is as follows: 198mg/L, al ³⁺ The content is as follows: 240mg/L, fe ²⁺ The content is as follows: 110mg/L;

(2) adding 30% of on-site water (volume parts);

(3) drilling pressure filtrate after treatment: cl ^- The content is as follows: 6225mg/L, ca ²⁺ The content is as follows: 155mg/L, al ³⁺ The content is as follows: 193mg/L, fe ²⁺ The content is as follows: 89mg/L;

(4) preparing drilling fluid, and preparing the following formula: 0.3% of polymer filtrate reducer, 4% of sulfonated phenolic resin, 2% of sulfonated lignite, 2% of emulsified asphalt and 4% of bentonite.

(5) The performance test is carried out on the drilling fluid, and the performance test is concretely as follows:

(6) evaluation of performance: all performances meet the requirements.

Claims (1)

1. A method for preparing drilling fluid from water-based drilling fluid pressure filtrate, comprising the steps of:

(1) Filtrate analysis: determination of Cl in Water-based drilling Hydraulic filtrate ^- 、Ca ²⁺ 、Al ³⁺ 、Fe ²⁺ Whether the content meets the following index;

the index is Cl in the water-based drilling hydraulic filtrate ^- ≤30000mg/L、Ca ²⁺ 400mg/L or more, 200mg/L or less of aluminum ions or less, and 100mg/L or less of iron ions;

(2) If the index is not met, adding water into the water-based drilling hydraulic filtrate until the index is met;

if the index is met, adding the following additives in percentage by mass of the total mass of the water-based drilling hydraulic filtrate into the water-based drilling hydraulic filtrate meeting the index:

the additive comprises 0.2 to 0.8 percent of polymer filtrate reducer, 3 to 8 percent of sulfonated phenolic resin, 1 to 8 percent of sulfonated lignite, 1 to 6 percent of emulsified asphalt and 4 percent of bentonite;

in step (2), cl is contained in the water-based drilling fluid filtrate according to the meeting index ^- 、Ca ²⁺ The additives with different proportions are added in different content ranges, and the specific steps are as follows:

①20000mg/L＜Cl ^- ≤30000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.7 to 0.8 percent of polymer filtrate reducer, 7 to 8 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 5 to 6 percent of emulsified asphalt and 4 percent of bentonite;

②20000mg/L＜Cl ^- ≤30000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 3 to 4 percent of sulfonated lignite, 4 to 5 percent of emulsified asphalt and 4 percent of bentonite;

③10000mg/L＜Cl ^- ≤20000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.5 to 0.6 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 7 to 8 percent of sulfonated lignite, 3 to 4 percent of emulsified asphalt and 4 percent of bentonite;

④10000mg/L＜Cl ^- ≤20000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.3 to 0.4 percent of polymer filtrate reducer, 5 to 6 percent of sulfonated phenolic resin, 5 to 6 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑤0mg/L＜Cl ^- ≤10000mg/L、200mg/L＜Ca ²⁺ ≤400mg/L

the formula comprises the following components: 0.4 to 0.5 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 2 to 3 percent of sulfonated lignite, 2 to 3 percent of emulsified asphalt and 4 percent of bentonite;

⑥0mg/L＜Cl ^- ≤10000mg/L、Ca ²⁺ ≤200mg/L

the formula comprises the following components: 0.2 to 0.3 percent of polymer filtrate reducer, 3 to 4 percent of sulfonated phenolic resin, 1 to 2 percent of sulfonated lignite, 1 to 2 percent of emulsified asphalt and 4 percent of bentonite.