CN114276791B - High-fluid loss plugging agent for oil-based drilling fluid - Google Patents
High-fluid loss plugging agent for oil-based drilling fluid Download PDFInfo
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Abstract
The invention provides a high-fluid loss plugging agent for oil-based drilling fluid, which aims to solve the problem that plugging materials for the existing water-based drilling fluid are not matched in the oil-based drilling fluid, and belongs to the technical field of petroleum drilling. The high-fluid loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass as 100 percent: 2% -10% of plant fiber; 1% -5% of polypropylene fiber; 1% -5% of polyester fiber; 2-5% of an adhesive; 2% -5% of tackifier; 50% -80% of limestone powder; 5% -10% of barium sulfate powder; 5 to 10 percent of ceramic powder. The high-fluid loss plugging agent for the oil-based drilling fluid has better compatibility with the oil-based drilling fluid and good plugging effect.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a high-fluid loss plugging agent for oil-based drilling fluid.
Background
In recent years, the exploration and development of shale gas resources in China have been greatly developed. Along with the gradual rise of the exploration and development degree of oil and gas resources and the gradual expansion of the development range, the oil-based drilling fluid is widely applied to the drilling of complex geological condition strata such as high-temperature deep wells, offshore drilling, high-inclination directional wells, horizontal wells, various complex well sections, deep ultra-deep layers, ocean deep water, pressure failure and the like. With this, the problem of oil-based drilling fluid leakage is also becoming increasingly severe. Studies have shown that about 90% of the drilling fluid leakage problems are caused by natural or induced fracture extension, and once leakage occurs, huge material waste is caused, the cost of oil-based drilling fluid is increased, the drilling period is delayed, and significant economic losses are caused. Therefore, the problem of leakage of the oil-based drilling fluid is overcome, and the development of the oil-based drilling fluid plugging agent is an urgent research subject of the oil-based drilling fluid workers at present.
At present, the water-based drilling fluid is various in plugging materials, and an adaptive plugging method can be selected according to different leakage conditions to effectively plug the holes. However, such lost circulation materials do not perform well because of a mismatch with oil-based drilling fluids, thereby limiting the applicability of such lost circulation materials in oil-based drilling fluids. Therefore, development of a high-fluid loss plugging agent specially suitable for oil-based drilling fluids is needed.
Disclosure of Invention
The invention provides a high-fluid loss plugging agent for oil-based drilling fluid, which is used for solving the problem that the plugging material for the existing water-based drilling fluid is not matched in the oil-based drilling fluid, and has better compatibility with the oil-based drilling fluid and good plugging effect.
The technical scheme adopted by the invention is as follows:
the high-fluid loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass as 100 percent:
2% -10% of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2% -5% of tackifier;
50% -80% of limestone powder;
5% -10% of barium sulfate powder;
5 to 10 percent of ceramic powder.
Further, the lengths of the plant fibers, the polypropylene fibers and the polyester fibers are 0.1-10 mm.
Further, the adhesive is a high molecular polymer emulsion.
Further, the adhesive is propylene monomer modified vinyl acetate emulsion, multi-element oxidized polyethylene wax emulsion, multi-element copolymerized vinyl acetate-ethylene emulsion or vinyl acetate-acrylic ester multi-element copolymer emulsion.
Further, the tackifier is organic soil.
Further, in the limestone powder, the weight ratio of 20-mesh limestone powder to 40-mesh limestone powder to 200-mesh limestone powder to 1000-mesh limestone powder is 1:1:5-30:5-10.
Further, in the barium sulfate powder, the weight ratio of 200-mesh and 400-mesh barium sulfate powder is 1:1.
Further, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 6:4.
further, the raw materials of the high-filtration-loss plugging agent are additionally added with a proper amount of walnut shells or rigid particles, and the particle size is 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes.
Further, the rigid particles are calcite, marble or limestone.
The beneficial effects of the invention are as follows:
the invention provides a high-fluid loss plugging agent for oil-based drilling fluid, which aims to solve the problem that plugging materials for the existing water-based drilling fluid are not matched in the oil-based drilling fluid. The high-fluid loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass as 100 percent: 2% -10% of plant fiber; 1% -5% of polypropylene fiber; 1% -5% of polyester fiber; 2-5% of an adhesive; 2% -5% of tackifier; 50% -80% of limestone powder; 5% -10% of barium sulfate powder; 5 to 10 percent of ceramic powder.
The high-fluid loss plugging agent has the following characteristics:
1. the high-fluid loss plugging agent for the oil-based drilling fluid has better compatibility with the oil-based drilling fluid, and is specially used for plugging operation in the drilling process of the oil-based drilling fluid.
2. The high-fluid loss plugging agent for the oil-based drilling fluid and base oil (diesel oil or white oil) for the oil-based drilling fluid are stirred to prepare the oil-based high-fluid loss plugging slurry. Under the action of pressure difference, the plugging slurry enters a leakage channel, and is rapidly deposited, filtered and compacted and glued to form a plug with certain coalescence strength, so that leakage is prevented.
3. The plugging agent for oil-based drilling fluid has certain net frame and coagulation strength, good adhesion with stratum, plasticity, adaptability to stress sensitivity change of crack width, capability of preventing failure or anti-spitting of the plugging agent due to pressure fluctuation in a well, wide applicability, simple plugging process, safe construction, high success rate and quick response.
4. The plugging slurry prepared by the high-fluid loss plugging agent for the oil-based drilling fluid can be used for plugging cracks and holes below 2 mm. If the anti-bridging agent is used for plugging larger-sized leakage channels, a proper amount of rigid particles or walnut shells can be added to improve bridging capacity.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of a sample after sand bed plugging test in example 4.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention.
Embodiments of the invention are described in detail below with reference to the accompanying drawings.
The high-fluid loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass as 100 percent:
2% -10% of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2% -5% of tackifier;
50% -80% of limestone powder;
5% -10% of barium sulfate powder;
5 to 10 percent of ceramic powder.
Further, the lengths of the plant fibers, the polypropylene fibers and the polyester fibers are 0.1-10 mm.
Further, the adhesive is a high molecular polymer emulsion.
Further, the adhesive is propylene monomer modified vinyl acetate emulsion, multi-element oxidized polyethylene wax emulsion, multi-element copolymerized vinyl acetate-ethylene emulsion or vinyl acetate-acrylic ester multi-element copolymer emulsion.
Further, the tackifier is organic soil.
Further, in the limestone powder, the weight ratio of 20-mesh limestone powder to 40-mesh limestone powder to 200-mesh limestone powder to 1000-mesh limestone powder is 1:1:5-30:5-10.
Further, in the barium sulfate powder, the weight ratio of 200-mesh and 400-mesh barium sulfate powder is 1:1.
Further, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 6:4.
further, the raw materials of the high-filtration-loss plugging agent are additionally added with a proper amount of walnut shells or rigid particles, and the particle size is 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes. For example, walnut shells accounting for 1-10% of the total weight of the component raw materials of the high-fluid loss plugging agent are added for plugging larger-sized leakage channels, so that bridging capacity is improved.
Further, the rigid particles are calcite, marble or limestone.
A method for preparing a high-fluid loss plugging agent for oil-based drilling fluid, wherein the high-fluid loss plugging agent is mixed before the oil-based drilling fluid is prepared, and the method comprises the following steps:
step S1, mixing a tackifier, barium sulfate powder, ceramic powder and half limestone powder to obtain a first premixed mixture;
s2, premixing plant fibers, polypropylene fibers, polyester fibers and residual lime powder to obtain a second premixed mixture;
and S3, taking a proper amount of base oil of the oil-based drilling fluid, and mixing the first premixed mixture, the second premixed mixture and the adhesive to obtain the high-fluid loss plugging agent dispersed in the base oil. When the blending amount of the high-filtration lost circulation agent is measured, the weight of the base oil is not counted.
By adopting the preparation method, the high polymer emulsion can be prevented from directly contacting with powder, loss, water loss and demulsification are reduced, and the performance of the raw materials is ensured. Because the polymer emulsion can keep a relatively dispersed state in the base oil, the polymer emulsion enters into the underground cracks together with the rest of powder under high pressure to perform plugging. Under the action of pressure difference, the high polymer emulsion enters a leakage channel along with the plugging slurry, and is filled by rapid bridging, deposition and fluid loss. Meanwhile, the polymer emulsion exists in the oil in a emulsion drop state, and fiber particles are adsorbed and glued by virtue of a polar effect, so that the packing is more compact, and the polymer emulsion has certain coalescence strength, thereby preventing leakage. Additional walnut shells or rigid particles, which are required for plugging large cracks, can be added during the preparation of the first premix mixture.
The high-fluid loss plugging agent for the oil-based drilling fluid prepared by the method in the embodiments 1-4 comprises the following specific components:
example 1: a high-fluid loss plugging agent for oil-based drilling fluid comprises the following components: 3g of plant fiber, 3g of polypropylene fiber, 2g of polyester fiber, 4g of multi-element oxidized polyethylene wax emulsion, 2g of organic soil, 75g of limestone powder, 5g of barium sulfate powder and 6g of ceramic powder. Wherein, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of limestone powder is 1:1:10:6; the weight ratio of 200-mesh and 400-mesh barium sulfate powder in the barium sulfate powder is 1:1; the weight ratio of the 180-mesh and 250-mesh ceramic powder in the ceramic powder is 6:4.
example 2: a high-fluid loss plugging agent for oil-based drilling fluid comprises the following components: 6g of plant fiber, 3g of polypropylene fiber, 3g of polyester fiber, 4g of multi-component copolymerized vinyl acetate-ethylene emulsion, 2g of organic soil, 62g of limestone powder, 5g of barium sulfate powder and 5g of ceramic powder. Wherein, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of limestone powder is 1:1:10:6; the weight ratio of 200-mesh and 400-mesh barium sulfate powder in the barium sulfate powder is 1:1; the weight ratio of the 180-mesh and 250-mesh ceramic powder in the ceramic powder is 6:4.
example 3: a high-fluid loss plugging agent for oil-based drilling fluid comprises the following components: 6g of plant fiber, 3g of polypropylene fiber, 1g of polyester fiber, 4g of vinyl acetate-acrylic ester multipolymer emulsion, 2g of organic soil, 74g of limestone powder, 5g of barium sulfate powder and 5g of ceramic powder. Wherein, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of limestone powder is 1:1:25:10; the weight ratio of 200-mesh and 400-mesh barium sulfate powder in the barium sulfate powder is 1:1; the weight ratio of the 180-mesh and 250-mesh ceramic powder in the ceramic powder is 6:4.
example 4: a high-fluid loss plugging agent for oil-based drilling fluid comprises the following components: 10g of plant fiber, 1g of polypropylene fiber, 5g of polyester fiber, 5g of vinyl acetate-acrylic ester multipolymer emulsion, 1g of organic soil, 70g of limestone powder, 4g of barium sulfate powder and 4g of ceramic powder. Wherein, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of limestone powder is 1:1:10:6; the weight ratio of 200-mesh and 400-mesh barium sulfate powder in the barium sulfate powder is 1:1; the weight ratio of the 180-mesh and 250-mesh ceramic powder in the ceramic powder is 6:4.
the following performance tests were conducted by selecting the high-fluid loss plugging agents of examples 1 to 4.
1. Full fluid loss time, mud cake thickness
The experimental method comprises the following steps: 15% (weight/volume) of the high-fluid loss plugging agent for the oil-based drilling fluid is added into 250mL of 0# diesel oil, the mixture is stirred at a high speed for 30 s, and the mixture is poured into a medium-pressure water loss meter completely within 3 min. The time to full filtration of the sample slurry was measured and the filter cake thickness was measured. The experimental results are shown in Table 1.
TABLE 1 total fluid loss time, mud cake thickness
| Sample numbering | Full filter time(s) | Mud cake thickness (mm) | Mud cake quality |
| Example 1 | 38”06 | 9 | Is relatively uniform and is not loose |
| Example 2 | 54”34 | 9 | Is relatively uniform and is not loose |
| Example 3 | 34”81 | 11 | Is relatively uniform and is not loose |
| Example 4 | 21”16 | 18 | Is relatively uniform and is not loose |
As can be seen from Table 1, the high-filtration plugging agent can rapidly filter in the 0# diesel oil, and the formed mud cake is not loose, compact and has a certain thickness.
2. Sedimentation stability
The experimental method comprises the following steps: adding a high-filtration plugging agent for 30% oil-based drilling fluid into 300mL 0# diesel oil, stirring at high speed for 10min, and weighting with barite powder to a density of 2.0g/cm 3 . Pouring the mixture into a 100mL graduated cylinder with a plug until the graduation line reaches 100mL, standing for 8h at normal temperature, and recording the stability condition.
TABLE 2 stability to 8h sedimentation at ambient temperature
| Sample numbering | Volume of oil (mL) | Description of the invention |
| Example 1 | 0.5 | No sedimentation at the bottom |
| Example 2 | 0.5 | No sedimentation at the bottom |
| Example 3 | 0.5 | No sedimentation at the bottom |
| Example 4 | 5 | No sedimentation at the bottom |
As can be seen from Table 2, there was a small amount of oil bleeding when left to stand for 8 hours at normal temperature. The high-fluid loss plugging agent has suspension stability under normal temperature.
3. Blocking property of sand bed
The experimental method comprises the following steps: (1) Adding a high-filtration plugging agent for 25% oil-based drilling fluid into 400mL of 0# diesel oil, and stirring at a high speed for 10min to prepare high-filtration plugging slurry.
(2) Measuring quartz sand (particle diameter of 12-21 mm) with certain mass, pouring into FA non-permeation filtration instrument 350cm 3 The scale marks are evenly shaken and are in solid state. Slowly pouring high-filtration leakage-stopping slurry, measuring the leakage under the conditions of 0.7MPa and 30min, and observing the penetration depth of the leakage-stopping slurry into a sand bed and the formed blockage depth. 300mL of oil-based mud (ρ=2.2 g/cm) was poured in again 3 ) The filtration loss at 0.7MPa for 30min was measured, and the penetration depth of the oil-based mud was observed.
Table 3 data of sand bed plugging experiments
| Sample numbering | Sand bed filtration capacity mL | Plugging slurry invasion depth mm | Depth of blockage mm | Oil-based mud invasion depth mm | Oil-based mud fluid loss mL |
| Example 1 | 10 | Full permeation | 55 | 30 | 0 |
| Example 2 | 13 | Full permeation | 57 | 31 | 0 |
| Example 3 | 4 | Full permeation | 36 | 25 | 0 |
| Example 4 | 6.2 | Full permeation | 49 | 18 | 0 |
The sample after sand bed plugging test in example 4 is shown in fig. 1. As can be seen from table 3 and fig. 1, under the action of pressure, the plugging slurry is fully filtered to form a plug, the plug has a certain thickness, the leakage of oil-based slurry is prevented, and the high-filtration plugging agent for the oil-based drilling fluid has a good sand bed plugging effect.
4. Pressure bearing capacity
The experimental method comprises the following steps:
(1) Reference is made to the method for evaluating the 4.4.6 bearing capacity in the temporary plugging agent evaluation standard (Q/67579579-6.179-2003) for Chuanqing drilling well drilling. The DL-type plugging material experimental device is used for taking 15% diesel oil base plugging slurry, and the plugging slurry is tested under the pressure of 2MPa on a slit plate with the width of 1 mm. The displacement fluid is oil-based mud (ρ=2.2 g/cm) 3 ）。
(2) And stabilizing the pressure for 10min under the pressure of 2MPa, if no pressure drop exists, gradually increasing the air source pressure to 5MPa, stabilizing the pressure for 5min, and observing the pressure drop condition.
Table 4 bearing capacity data
As can be seen from Table 4, the high-fluid loss plugging slurry for oil-based drilling fluids can form plugs in 1mm slit plates, and the compressive strength of the high-fluid loss plugging slurry can reach 5MPa.
The high-fluid loss plugging agent has the following characteristics:
1. the high-fluid loss plugging agent for the oil-based drilling fluid has better compatibility with the oil-based drilling fluid, and is specially used for plugging operation in the drilling process of the oil-based drilling fluid.
2. The high-fluid loss plugging agent for the oil-based drilling fluid and base oil (diesel oil or white oil) for the oil-based drilling fluid are stirred to prepare the oil-based high-fluid loss plugging slurry. Under the action of pressure difference, the plugging slurry enters a leakage channel, and is rapidly deposited, filtered and compacted and glued to form a plug with certain coalescence strength, so that leakage is prevented.
3. The plugging agent for oil-based drilling fluid has certain net frame and coagulation strength, good adhesion with stratum, plasticity, adaptability to stress sensitivity change of crack width, capability of preventing failure or anti-spitting of the plugging agent due to pressure fluctuation in a well, wide applicability, simple plugging process, safe construction, high success rate and quick response.
4. The plugging slurry prepared by the high-fluid loss plugging agent for the oil-based drilling fluid can be used for plugging cracks and holes below 2 mm. If the anti-bridging agent is used for plugging larger-sized leakage channels, a proper amount of rigid particles or walnut shells can be added to improve bridging capacity.
Claims (7)
1. The high-fluid loss plugging agent for the oil-based drilling fluid is characterized by comprising the following raw materials in percentage by mass as 100 percent:
2% -10% of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2% -5% of tackifier;
50% -80% of limestone powder;
5% -10% of barium sulfate powder;
5% -10% of ceramic powder;
wherein the adhesive is propylene monomer modified vinyl acetate emulsion, multi-element oxidized polyethylene wax emulsion, multi-element copolymerized vinyl acetate-ethylene emulsion or vinyl acetate-acrylic ester multi-element copolymer emulsion;
the tackifier is organic soil;
the high-fluid loss plugging agent for the oil-based drilling fluid is mixed before the oil-based drilling fluid is prepared, and the preparation method comprises the following steps:
step S1, mixing a tackifier, barium sulfate powder, ceramic powder and half limestone powder to obtain a first premixed mixture;
s2, premixing plant fibers, polypropylene fibers, polyester fibers and residual lime powder to obtain a second premixed mixture;
and S3, taking a proper amount of base oil of the oil-based drilling fluid, and mixing the first premixed mixture, the second premixed mixture and the adhesive to obtain the high-fluid loss plugging agent dispersed in the base oil.
2. The high fluid loss plugging agent for oil-based drilling fluids according to claim 1, wherein the lengths of the plant fiber, the polypropylene fiber and the polyester fiber are 0.1-10 mm.
3. The high fluid loss plugging agent for oil-based drilling fluids according to claim 1, wherein the weight ratio of 20 mesh limestone powder, 40 mesh limestone powder, 200 mesh limestone powder, 1000 mesh limestone powder is 1:1:5-30:5-10.
4. The high fluid loss plugging agent for oil-based drilling fluids according to claim 1, wherein the weight ratio of 200 mesh to 400 mesh barium sulfate powder in the barium sulfate powder is 1:1.
5. The high fluid loss plugging agent for oil-based drilling fluids according to claim 1, wherein the weight ratio of 180 mesh and 250 mesh ceramic powders in the ceramic powder is 6:4.
6. the high-fluid loss plugging agent for oil-based drilling fluids according to claim 1, wherein a proper amount of walnut shells or rigid particles with a particle size of 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes are additionally added to the composition raw materials of the high-fluid loss plugging agent.
7. The high fluid loss plugging agent for oil-based drilling fluids according to claim 6, wherein the rigid particles are calcite, marble or limestone.
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| CN104152119A (en) * | 2013-05-13 | 2014-11-19 | 中国石油化工股份有限公司 | Oil-based drilling fluid use preparation |
| CN104388067B (en) * | 2014-10-31 | 2020-01-14 | 中国石油化工集团公司 | Composite leak-proof agent for oil-based drilling fluid |
| CN105086956A (en) * | 2015-08-28 | 2015-11-25 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Tackifier for oil-based drilling fluid and preparation method therefor |
| CN109097013A (en) * | 2018-09-06 | 2018-12-28 | 中国海洋石油集团有限公司 | A kind of high temperature resisting type oil base drilling fluid pressure-bearing sealing agent and preparation method thereof |
| CN110819322B (en) * | 2019-11-08 | 2022-07-01 | 成都汉元君业油田技术有限公司 | Special high-filtration-loss plugging agent for oil-based drilling fluid |
| CN111808224B (en) * | 2020-07-17 | 2021-06-08 | 中国石油大学(北京) | Copolymer and preparation method thereof, application of copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid |
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